Is cheddar cheese an element, compound, homogeneous mixture, or heterogeneous mixture?

Answer:

The answer to your question is: 5 neutrons

Explanation:

Beryllium has 4 protons

# of neutrons in beryllium-9

Atomic number (Z) = 4 (number of protons)

Mass  number (A) = 9 (number of protons + neutrons)

                          Mass number = number of protons + number of neutrons

                          9   = 4 + number of neutrons

                          neutrons = 9 - 4

                          neutrons = 5

Beryllium has 4 protons in its nucleus, so the atomic number is 4. Beryllium-9 mass number will be 9 which is equal to neutrons added to protons. So, the correct answer is 5.

Atomic number is defined as the charged number of an atomic nucleus. It is equal to number of protons present in the nucleus. The number of protons define the identity of an element , for example if an element has 5 protons it is Boron (B), no matter how many neutrons are present in it.

In the periodic table, Atomic number is written at the upper left corner which is equal to the number of protons.

The atomic number is indicated as a left subscript representing a particular atomic species in the symbol. An atom or a nucleus pf Carbon (Chemical symbol C), it may be written as [tex]_6C[/tex].

Atomic number is important as we can easily identity the element of an atom and periodic table is arranged according to increased atomic number.

Thus, Beryllium has 4 protons in its nucleus, so the atomic number is 4. Beryllium-9 mass number will be 9 which is equal to neutrons added to protons. So, the correct answer is 5.

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Answer:

1) 2.0 g

2) 0 g

3) 4.17 g

4) 2.57 g

Explanation:

First of all, we need to know the compounds and the reaction. The ion carbonate is [tex]CO3^{-2}[/tex], and the ion nitrate is [tex]NO3^{-}[/tex].

Sodium is in group 1, so it must lose one electron to be stable, and be the cation [tex]Na^{+}[/tex]. Silver has only one electron too, so the cation will be [tex]Ag^{+}[/tex].

To form the chemical compounds, first we put the cation, then the anion, and change their charges without the signal:

Sodium carbonate: Na2CO3

Silver nitrate: AgNO3

Silver carbonate: Ag2CO3

Sodium nitrate: NaNO3

The balanced reaction will be:

Na2CO3 + 2 AgNO3 --> Ag2CO3 + 2 NaNO3

Now, we must check the stoichiometry, which will be 1:2:1:2 (always in number of moles)

The question wants to know the mass value, so we need to know the molar mass of these compounds. Checking the periodic table will see that:

Na = 23 g/mol, C = 12 g/mol, N = 14 g/mol, O = 16 g/mol, Ag = 108 g/mol

So the molar mass of the compounds must be:

Na2CO3 = 106 g/mol (2x23 + 12 + 3x16)

AgNO3 = 170 g/mol (108 + 14 + 3x16)

Ag2CO3 = 276 g/mol (2x108 + 12 + 3x16)

NaNO3 = 85 g/mol

We have a mixture of the reactants, so one probably would be in excess, so, first will need to test. Let's do the stoichiometry calculus using silver nitrate as the limit, so:

1 mol of Na2CO3 ---------- 2 mol of AgNO3

106 g ------------------------------ 2x170 = 340 g

x ------------------------------------ 5.14 g

By a simple direct three rule:

340x = 544.84

x = 1.6 g of Na2CO3

That means that for this reaction, we only need 1.6 g of Na2CO3 to react with 5.14 of AgNO3. How we have 3.60 g of Na2CO3, it is on excess, and all the AgNO3 will be consumed.

1) The mass of Na2CO3 that remains after the reaction will be the initial less the mass that reacted:

m = 3.6 - 1. 6 = 2.0 g

2) All the AgNO3 reacted, so there isn't a mass present after the reaction.

m = 0 g

3) Now, doing the stoichiometry calculus between AgNO3 and Ag2CO3

2 moles of AgNO3 ------------- 1 mol of Ag2CO3

2x170 g ------------------------------- 276 g

5.14 g --------------------------------- x

By a simple direct three rule:

340x = 1418.64

x = 4.17 g of Ag2CO3

4) Now, doing the stoichiometry calculus between AgNO3 and NaNO3

2 moles of AgNO3 ----------------------- 2 moles of NaNO3

2x170 g ---------------------------------------- 2x85 g

5.14 g ------------------------------------------- x

By a simple direct three rule:

340x = 873.8

x = 2.57 g

2.0 grams of sodium carbonate, 0 gram of silver nitrate, 4.17 grams of silver carbonate and 2.57 grams of sodium nitrate is present after the reaction is complete.

We can calculate Number of grams or wanted weight through below expression:

[tex]\[{\rm{n = }}\frac{{\rm{W}}}{{\rm{M}}}\][/tex], where

n =  no. of mole

W = given weight

M = molar mass

In the question given balanced chemical reaction is:

[tex]${\rm{N}}{{\rm{a}}_{\rm{2}}}{\rm{C}}{{\rm{O}}_{\rm{3}}}{\rm{ + 2AgN}}{{\rm{O}}_{\rm{3}}} \to {\rm{A}}{{\rm{g}}_{\rm{2}}}{\rm{C}}{{\rm{O}}_{\rm{3}}}{\rm{ + 2NaN}}{{\rm{O}}_{\rm{3}}}$[/tex]

It is clear that mole ratio of reactant and product is 1:2::1:2.

Also mention that, given initial mass of sodium carbonate = 3.60g

And given initial mass of silver nitrate = 5.14g

In the reactant mixture one would be present in the excess quantity and we did stoichiometry calculation by assuming silver nitrate as the limiting reactant, so:

1 mole of Na₂CO₃ ............................. 2 mole of AgNO₃

106 g                     .............................. 2 × 170 = 340 g

x                            .............................. 5.14 g

Now by using simple three rule, we can calculate the value of x:

340x = 544.84

x = 1.6 g of Na₂CO₃

(1). Mass of Na₂CO₃ remains after the completion of reaction:

Initial - used = 3.6 - 1.6 = 2.0 g

(2). All the AgNO₃ get consumed by the excess Na₂CO₃, so mass present after completion of reaction is 0 g.

(3). Now again we will do stoichiometry calculation between AgNO₃ and Ag₂CO₃:

2 moles of AgNO₃ ............................ 1 mole of Ag₂CO₃

2 × 170 g                ............................. 276 g

5.14 g                     ............................. x

Now by using simple three rule, we can calculate the value of x:

340x = 1418.64

x = 4.17 g of Ag₂CO₃

(4). Again we will do stoichiometry calculation between AgNO₃ and NaNO₃:

2 moles of AgNO₃  .............................. 2 moles of NaNO₃

2 × 170 g                  .............................. 2 × 85 g

5.14 g                       ............................... x

Now by using simple three rule, we can calculate the value of x:

340x = 873.8

x = 2.57 g

Hence, amount of sodium carbonate, silver nitrate, silver carbonate and sodium nitrate is 2.0 g, 0 g, 4.17 g and 2.57 g respectively.

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The difference between measuring a foot as 27 centimeters and 27.00 centimeters is in the precision of the measurements. The first suggests an estimated measurement likely made with a standard ruler without fine markings, while the second implies a more exact measurement, possibly with a tool that includes millimeter markings.

The difference between the two measurements of a student's foot being 27 centimeters and 27.00 centimeters lies in the precision of the measuring instruments used. In the first measurement with 27 centimeters, only the whole numbers are reported, which suggests that the instrument used could have been a standard ruler that does not have detailed millimeter markings. Because of this, only the length in whole centimeters is certain, while the tenths place is estimated. In the second measurement of 27.00 centimeters, the inclusion of two decimal places indicates that a more precise measuring tool was used, likely one with millimeter (which are tenths of a centimeter) markings. This allowed the student to report the measurement with greater specificity, showing that the length is not just 27 centimeters, but 27.00 centimeters, where the trailing zeros indicate confidence in the measurement up to the hundredths place.

It is important to select the appropriate measuring tool for the precision required. For everyday measurements, a standard ruler might suffice, but for more precise measurements, a tool that provides readings in millimeters or even smaller units would be necessary.

Answer : The correct option is, (B) 12.8 ml

Explanation :

As we know that for the measurement of the volume of liquid in graduated cylinder are shown by placing the graduated cylinder on the flat surface and then view the height of the liquid in the graduated cylinder with the naked eyes directly level with the liquid.

The liquid will tend to curve downward that means this curve is known as the meniscus.

In the case of colored liquid, we are always read the upper meniscus of the liquid for the measurement.

In the case of colorless liquid, we are always read the lower meniscus of the liquid for the measurement.

In the given image, there are 10 division between the 12 and 13 and the smallest division is, 0.1. So, the volume of liquid will be, 12 ml + 0.8 ml = 12.8 ml.

Hence, the correct option is, (B) 12.8 ml

Answer:

Abundance of Ga 70.925 is 0.399 and percentage abundance of Ga 39.9%

Abundance of Ga 68.926 is 0.601 and percentage abundance is 60.1 %.

Explanation:

we know there are two naturally occurring isotopes of gallium Ga 68.926 and Ga 70.925.

First of all we will set the fraction for both isotopes

X for the isotopes having mass 70.925

1-x for isotopes having mass 68.926

The average atomic mass of Ga is 69.72.

we will use the following equation,

70.925 x + 68.926 (1-x) = 69.72

70.925 x + 68.926 - 68.926x = 69.72

70.925x- 68.926x = 69.72 - 68.926

1.99 x = 0.794

x= 0.794/ 1.99

x= 0.399

abundance of Ga 70.925 is 0.399, because we solve the fraction x.

0.399 × 100 = 39.9 %

39.9 % is percentage abundance of Ga 70.925

now we will calculate the abundance of Ga 68.926.

(1-x)

1 - 0.399 = 0.601

abundance of Ga 68.926 is 0.601 and percentage abundance is

0.601 × 100= 60.1 %

Answer:

According with atomic weight and valences

Explanation:

Mendeleev organized the periodic table according atomic weight because the elements exhibit an apparent periodicity of properties, and the magnitude of the weight determines the character of the element

Answer:

a) Pb(NO3)2 + 2KI ⇒ PbI2 + 2K(NO3)

ion that form the precipitate = Pb2+ and I-

Spectator ions = NO3. and K+

b) Pb 2+ + 2 I- ⇒ PbI2

Explanation:

The balanced chemical equation for the reaction of Lead(II) Nitrate and potassium iodide is 2 KI(aq) + Pb(NO3)2(aq) → 2 KNO3(aq) + PbI2(s). The precipitate forming ions are Pb2+ and I-, leading to the net ionic equation: Pb2+(aq) + 2I-(aq) → PbI2(s). The spectator ions are NO3- and K+.

When Lead(II) Nitrate reacts with potassium iodide, the balanced chemical equation becomes:
2 KI(aq) + Pb(NO3)2(aq) → 2 KNO3(aq) + PbI2(s)
The ions that form the precipitate in this reaction are Pb2+ from Lead(II) Nitrate and I- from Potassium Iodide. This results in the formation of Lead(II) Iodide, a yellow precipitate. The spectator ions, which do not participate in the formation of the precipitate, are NO3- from Lead(II) Nitrate and K+ from Potassium Iodide.
The net ionic equation therefore only includes the ions that form the precipitate, which are Pb2+ and I-. It becomes:
Pb2+(aq) + 2I-(aq) → PbI2(s).

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Answer:

dG will be the same -20 kcal/mol

Explanation:

The dG can be expressed in terms of the G(products) - G(reactants). If the amount of enzyme is doubled the Gibbs energy of the reactants and products will be the same, so the substraction dG has the same value

Answer:

The answer to your question is: the lasr one.

Explanation:

Ammonia = NH₃

It is tetrahedral because there are four bonded pairs around nitrogen.  This option is wrong, ammonia, does not have four bonds only has 3.

It is trigonal pyramidal because there are four bonded pairs around nitrogen.  This option is wrong because ammonia does not have 4 bonds.

It is tetrahedral because there are three bonded pairs and one lone pair around nitrogen.  A tetrahedral has 4 bonds not only three, this option is wrong.

It is trigonal pyramidal because there are three bonded pairs and one lone pair around nitrogen. This option is right, it has three bonded pairs and one lone pair around nitrogen so it is a trigonal pyramidal.

The statement that explains the VSEPR geometry of an ammonia molecule is ; ( D ) It is trigonal pyramidal because there are three bonded pairs and one lone pair around nitrogen.

    Ammonia ( NH₃ ) has a characteristic strong offensive smell and absence of water in its formation. It is very harmful when exposed to the environment. Ammonia has 3 bonded pairs and a single unpaired electron around nitrogen atom.

The Lewis structure of ammonia depicts a trigonal pyramidal structure because of the bonding of 3 hydrogen atoms to the Nitrogen atom and a lone pair

Hence we can conclude that  VSEPR geometry of an ammonia molecule is that it is trigonal pyramidal because there are three bonded pairs and one lone pair around nitrogen.

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Answer:

Explanation:

lung air ways the mucus will clog it up causing asthma hope this helped :P

Answer:

The weaker interaction in between acetone and chloroform.

Explanation:

The interactions among acetone and acetone or chloroform with chloroform are stronger because both substances are non polar, they are attracted by the interactions called dipole - dipole. This kind of joints use some hydrogen bridge to join the two compounds.

In the case of the interaction acetone  chloroform, they are similar but not the same substance, the acetone is less polar than the chloroform, so is necessary to induce a dipole, and this joint is less strong than the normal dipole - dipole.  

Chloroform-acetone interactions are stronger than acetone-acetone and chloroform-chloroform interactions.

The relative strength of chloroform-acetone interactions compared to acetone-acetone and chloroform-chloroform interactions depends on the polarities of the molecules involved. Chloroform, CHCl3, is more polar than acetone, CH3COCH3. The presence of the more polar chloroform molecule leads to stronger dipole-dipole interactions with acetone compared to the acetone-acetone and chloroform-chloroform interactions, making the chloroform-acetone interactions stronger than the other two.

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Answer:

The answer to your question is: 24.31 amu

Explanation:

Magnesium isotopes      1  mass 23.99 abundance 78.99%

                                         2 mass 24.99    abundance    10.00%

                                        3  mass 25.98    abundance    11.01 %

Atomic mass of magnesium = ((23.99x0.7899) + (24.99 x 0.10) + (25.98x0.1101)

Atomic mass of magnesium = 18.95 + 2.5 + 2.86

Atomic mass of magnesium = 24.31 amu

The atomic mass of the magnesium atom can be calculated by adding the masses of isotopes. The atomic mass of magnesium element is 24.31 atomic mass units.

Atomic mass is the estimation of the number of neutrons and protons that can also be given as the average atomic mass that is given by the mass and the relative abundance of the isotopes.

Given,

Mass of Mg isotope 1 (M₁) = 23.99

Mass of Mg isotope 2 (M₂) = 24.99

Mass of Mg isotope 3 (M₃ ) = 25.98

Natural abundances of Mg isotope 1 (A) = 78.99%

Natural abundances of Mg isotope 2 (B) = 10.00%

Natural abundances of Mg isotope 2 (C) = 11.01%

The atomic mass of Mg is calculated as:

= (M₁ × A) + (M₂ × B) + (M₃ × C)

= ((23.99 × 0.7899) + (24.99 × 0.10) + (25.98 × 0.1101)

= 18.95 + 2.5 + 2.86

= 24.31 amu

Therefore, 24.31 amu is the atomic mass of magnesium.

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Answer:

We also need the nitrogen intake

Explanation:

The nitrogen balance is the difference between the nitrogen intake and nitrogen excreted. If this calculation is positive, the body grow; if it is negative, the body is decreased.

Answer:

The answer to your question is: A. Has few interaction with water

Explanation:

As you can read in the question and see in the picture, phospholipid is formed by to parts:

A head that is polar, that means it prefer to interact with polar substances like water.

A tail: that is non polar, that means it doesn't interact with polar substances, then, they only interact with non polar substances.

In the cell membrane, the heads of the phospholipids are in the borders and the tails are inside. Membrane is like a sandwich where the breads would be the heads and the content (ham, etc) would be the tails.

The hydrophobic portion of a phospholipid has few interactions with water. Correct option is A.

The hydrophobic portion of a phospholipid refers to the nonpolar tail that is repelled by water and is therefore hydrophobic. This means that it has few interactions with water and prefers to be in a non-aqueous environment.

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Answer:

The correct answer for this one, is e. because CH2O is a chemical compound of the aldehyde type and the aldehydes are only at the monosaccharides (carbohydrates)

Explanation:

As you should know, amino acid contains a carboxyl group and an amino group, DNA it is compounded by  a pentose, nitrogen base and a phosphate group, the triglyreceride are  long chain fatty acid compounds, so much of CH2O. The proteins are very complex structures to have only those elements.

Answer:

E. monosaccharide

Explanation:

monosaccharides have this chemical formula: (CH2O)

This means 1 carbon, 2 hydrogen and 1 oxygen

The average atomic mass of strontium is calculated by multiplying the mass of each isotope by its fractional abundance and summing these products. For strontium, this results in an average atomic mass of 87.712 amu.

To calculate the relative average atomic mass of strontium (Sr), we need to use the masses and percent abundances of its isotopes. The formula for this calculation is:

average atomic mass = (fractional abundance of isotope 1 × isotopic mass 1) + (fractional abundance of isotope 2 × isotopic mass 2) + ...

For strontium isotopes:

Adding these values together gives:

average atomic mass of Sr = 0.42 amu + 8.514 amu + 6.09 amu + 72.688 amu = 87.712 amu

Answer:

D. groups and periods

Explanation:

In groups  the elements have the same electronic configuration in the last electronic shell and we expect that they will have similar chemical properties.

In periods the electronic configuration is increasing with one electron as we proceed from left to right and so the chemical properties will vary significantly.

Answer: The correct answer is Option B.

Explanation:

Combustion reaction is defined as the chemical reaction in which a hydrocarbon reacts with oxygen gas to produce carbon dioxide gas and water molecule. The chemical equation for this reaction follows:

[tex]\text{hydrocarbon}+O_2\rightarrow CO_2+H_2O[/tex]

Incomplete combustion is defined as the reaction in which supply of oxygen is limited and carbon monoxide gas is also produced as a product. The chemical equation for this reaction follows:

[tex]\text{hydrocarbon}+O_2\text{(limited)}\rightarrow CO+CO_2+H_2O[/tex]

Single displacement reaction is defined as the reaction in which more reactive element displaces a less reactive element.

[tex]AB+C\rightarrow CB+A[/tex]

Element C is more reactive than element A.

As, we can see that oxides are the products in both complete combustion reaction and incomplete combustion reaction.

Hence, the correct answer is Option B.

Oxides are chemical compounds comprising of oxygen and another element. They're most often formed during combustion, where oxygen reacts with another substance to produce an oxide. One example is the burning of coal which produces carbon dioxide.

Oxides are chemical compounds that contain at least one oxygen atom and one other element. Most of the Earth's crust consists of solid oxides, the result of    elements being oxidized by the oxygen in the air. Option B, 'Products formed during combustion.' is the most accurate. During combustion, oxygen reacts with a substance, resulting in the production of an oxide. For example, when you burn coal (which is mostly carbon), carbon dioxide (CO2) is one of the products formed.

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Answer:

The answer to your question is:

Explanation:

Data

carbon        7.3%          =     7.3g

hydrogen    4.5%         =      4.5g

oxygen       36.4%         =     36.4 g

nitrogen     31.8%         =     31.8 g

Now

For carbon

                    12 g --------------------1 mol

                    7.3 g     -------------     x

                       x = 7.3/12 = 0.608 mol

For hydrogen

                 1 g   --------------------  1 mol

                 4.5 g  ------------------    x

                   x = 4.5 mol

For oxygen

             16 g ------------------- 1 mol

             36.4 g ----------------    x

             x = 2.28 mol

For nitrogen

              14 g   ----------------   1 mol

              31.8 g ---------------    x

             x = 2.27 mol

Now divide by the lowest result, the is 0.608 from carbon

carbon              0.608/0.608 = 1

hydrogen           4.5/ 0.608 = 7.4

oxygen              2.28/0.608 = 3.75

nitrogen             2.27/0.608 = 3.73

Empirical formula = CH₇O₄N₄

For a compound with 7.3% carbon, 4.5% hydrogen, 36.4% oxygen, and 31.8% nitrogen, and a molecular mass of 176.0 g/mol, the empirical formula is CH7O4N4, and the molecular formula is CH9O5N5.

To find the empirical and molecular formulas of a compound with 7.3% carbon, 4.5% hydrogen, 36.4% oxygen, and 31.8% nitrogen, we start by assuming a 100g sample. This assumption simplifies the calculation since the percentages can directly translate to grams.

Next, we find the simplest whole number ratio by dividing each mole value by the smallest mole value calculated, which is for carbon.

The ratio simplifies to C: 1, H: 7, O: 4, and N: 4, giving us an empirical formula of CH7O4N4. The empirical formula mass (EFM) is calculated by summing the masses of all atoms in the empirical formula, which totals to 176 g/mol. Since the empirical formula mass matches the given molecular mass of 176.0 g/mol, the empirical formula CH7O4N4 is also the molecular formula.

To find the molecular formula, we need to compare the molar mass of the empirical formula with the given molar mass (176.0 g/mol) to find the "scaling factor" by which to multiply the empirical formula.

Calculate the molar mass of the empirical formula:

1 × 12.01 + 7 × 1.008 + 4 × 16.00 + 4 × 14.01 = 12.01 + 7.056 + 64.00 + 56.04 = 139.106 g/mol

Calculate the scaling factor:

Scaling factor = Molecular formula mass ÷ Molecular formula mass

Scaling factor = 176.0 ÷ 139.106

Scaling factor ≈ 1.264

Molecular formula: C1 × 1.264 H7 × 1.264 O4 × 1.264 N4 × 1.264

Molecular formula: C1.264 H8.848 O5.056 N5.056

Since we need whole numbers, we'll round these to the nearest whole number: CH7O4N4.

So, the empirical formula of the compound is CH7O4N4 and its molecular formula is CH9O5N5

Answer:

Explanation:

To neutralize a chemical to a pH of 7 before discarding, one would require a significant amount of acids or bases. Our best guess is that the solution in itself is either an acid or a base. Neutralization with the right amount of a proper reagent can bring the pH of the solution to a neutral 7.

If the solution has a pH originally greater than 7, add a corresponding amount of acid to it. This will reduce the concentration and bring it to a neutral point. Provided one is dealing with a solution of pH less than 7, simply add a base to to bring the solution to neutrality.

Remember, the term pH (or pH value) is a standard measure of the level of acidity/basicity of a chemical solution. The pH value typically ranges from 0 to 14, where a solution with pH 7 is referred to as being neutral. While chemical solutions with pH values greater than 7 are base, meanwhile those lower than 7 indicate acidity.

In this instance, we want the chemical solution to become neutral (ie. to a have pH of 7). Logically this implies that this chemical solution should either be an acid or a base, but not neutral.

Scenario 1:

the chemical solution is a base, i.e it has pH values greater than 7: adding the right amounts of acid to the base should cause a reaction that would make the chemical solution neutral.

Scenario 2:

the chemical solution is an acid, i.e it has a pH lower than 7. In this case, adding the right amounts of a base solution to the acid should make neutrality.

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Answer:

The last reaction is an oxidation:

[tex]Cr_(_s_)~->~Cr^+3_(_a_q_)~+~3e^-[/tex]

Explanation:

For the first half-reaction, we have a strange reduction the charge is not balanced so, it is not a possible reaction. In the second half-reaction we will have a reduction process as such, we have 2 negative charges in both sides and the electrons are placed on the reactive side. For the third half-reaction, we will have strange oxidation because the charge is not balanced, we have a charge of +1 in the left and a charge of -1 in the right, so this is not a possible reaction. For the last half-reaction, we have the production of electrons and the charge is equal on both sides, which is zero.  

Finally to remember, Oxidation=production of electrons, Reduction=Consumtion of electrons.

Answer:

It is a law because it is a statement of fact that does not need any more experimental support.

Explanation:

A hypothesis is an acceptable assumption that is formulated through the collection of information and data and that attempts to explain some phenomenon. In other words, a hypothesis is a conjecture with which one tries to explain an observed fact. The formulation of a hypothesis can be derived in two different ways: by generalization, from a certain number of cases or observed phenomena; and, by analogies observed in the occurrence of different phenomena.

A theory is something that attempts to explain some phenomenon and that is accepted as true by the scientific community. In other words, a theory is a set of rules that describe the behavior of a particular system.

A law is a statement that expresses the constant relationships between phenomena of nature, society or the mind. Scientific law can be defined as an invariable relationship of terms. In other words, a law is what is scientifically proven to be true, it is universally applicable.

So scientific theories and scientific laws are based on hypotheses. But a theory is the explanation of an observed phenomenon, while a scientific law is the description of an observed phenomenon.

The movements of bodies in space are governed by Newton's Laws. These are laws why they are demonstrated by mathematical formulas and Universal application.

Then, the correct option is "It is a law because it is a statement of fact that does not need any more experimental support."

Answer:

D

Explanation:

I took a quiz

Answer:

A

Explanation:

Each 12 oz of latte contains 8 oz of milk, as the group of people ordered 12 lattles we need

12 x 8 = 96 oz of milk

As 33.8 oz is a litre

33.8 oz - 1 L

96 oz - x

x = [tex]\frac{96}{33.8}[/tex] = 2.84 L

As Brandon have 2.5 L of milk

2.84 L - 2.5 L = 0.34 L

He will be short 0.34 L

He will need 2.84 L, so he is short 0.34 L. Option A

Each latte contains 8 oz of milk, and you have 12 lattes.

Total milk needed = 8 oz/latte * 12 lattes = 96 oz

We convert ounces to liters using the conversion factor provided (1 L = 33.8 oz):

Total milk needed = 96 oz / 33.8 oz/L = 2.84 L

Then;

He has 2.5 liters of milk left.

Comparing what he needs to what he has:

He needs 2.84 liters

He has  2.5 liters

Looking at what we have done we can see that he will need 2.84 L, so he is short 0.34 L.

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Answer: The freezing point of a 0.765 m solution of nitrobenzene in naphthalene is [tex]74.6^0C[/tex]

Explanation:

Depression in freezing point is given by:

[tex]\Delta T_f=i\times K_f\times m[/tex]

[tex]\Delta T_f=T_f^0-T_f=(80.3-T_f)^0C[/tex] = Depression in freezing point

i= vant hoff factor = 1 (for non electrolyte such as nitrobenzene)

[tex]K_f[/tex] = freezing point constant = [tex]7.45^0C/m[/tex]

m= molality  = 0.765

[tex](80.3-T_f)^0C=1\times 7.45\times 0.765[/tex]

[tex]T_f=74.6^0C[/tex]

Thus the freezing point of a 0.765 m solution of nitrobenzene in naphthalene is [tex]74.6^0C[/tex]

The freezing point of a 0.765 m solution of nitrobenzene in naphthalene is calculated using the freezing point depression constant (Kf) and the molality of the solution. The change in freezing point is found to be 5.69925° C, which is subtracted from the pure freezing point of naphthalene to obtain 74.6° C as the final freezing point of the solution.

To determine the freezing point of a solution, you can use the formula for the freezing point depression (ΔTf), which states that ΔTf = Kf * m, where Kf is the freezing point depression constant for the solvent and m is the molality of the solution. In this case, the given Kf for naphthalene is 7.45° C kg/mol, and the molality (m) of the nitrobenzene solution is 0.765 m (which means 0.765 moles of nitrobenzene per kilogram of naphthalene).

The change in freezing point can be calculated as:

ΔTf = Kf * m

ΔTf = 7.45° C kg/mol * 0.765 mol/kg

ΔTf = 5.69925° C

After calculating the change in freezing point, subtract this value from the pure freezing point of naphthalene (Pure freezing point = 80.3° C) to find the freezing point of the solution:

Freezing point of the solution = Pure freezing point - ΔTf
Freezing point of the solution = 80.3° C - 5.69925° C
Freezing point of the solution = 74.60075° C (rounded to 74.6° C)

Answer:

higher, left

Explanation:

Given that the reaction consumes 462 kJ of energy. It means that the reaction is a endothermic reaction.

In the energy profile of the endothermic diagrams, The reactants are at a very low level as compared to the products and hence, energy is supplied to overcome this difference.

Hence, The energy levels of products are higher than the energy level of reactant.

Hence, already stated, heat is required by the reaction and thus heat is written to the reactant side which is to the left side of the equation.

Answer:

B is a precipitation reaction.

Explanation:

This is because a precipitation reaction is when a solid is made from the combination of cations and anions in a solution to create a solid.

[tex]\rm 2 NaI(aq) + Hg_2(NO_3)_2(aq) \rightarrow Hg_2I_2(s) + 2 NaNO_3(aq)[/tex] is a precipitation reaction. Therefore, the correct option is option B.

When two soluble compounds are combined, a precipitation reaction occurs, which is a sort of chemical reaction that creates an insoluble solid known as a precipitate. When two compounds mix to generate an insoluble compound that separates out as a solid from the solution, a precipitation reaction takes place.

The reactants in a precipitation reaction are typically ionic compound-containing aqueous solutions. The ions from the various chemicals may combine in these solutions to generate a complex that is only partially soluble. As a result, a solid precipitate that settles out of the solution is created. [tex]\rm 2 NaI(aq) + Hg_2(NO_3)_2(aq) \rightarrow Hg_2I_2(s) + 2 NaNO_3(aq)[/tex] is a precipitation reaction.

Therefore, the correct option is option B.

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Answer:

orbital

Explanation:

electrons are found in an orbital

Answer:

c. reducing oxygen level on hemoglobin.

Explanation:

Carbon monoxide, whose chemical formula is CO, is an odorless, colorless, flammable and highly toxic gas. It can cause death when breathing at difficult levels. It occurs when combustible materials such as gas, gasoline, kerosene, coal, oil, tobacco or wood are burned in low oxygen environments. Fireplaces, boilers, water heaters and household appliances that burn fuel, such as stoves, can also produce it if they are not working properly. Vehicles stopped with the engine running also fire him.

Carbon monoxide modifies the amount of oxygen available to cells, which hinders cellular function.

Carbon monoxide binds tightly to hemoglobin preventing the red blood cell from carrying adequate oxygen, leading to hypoxic injury. Other chemicals such as carbon tetrachloride promote free radicals, which injure cells and destroy cellular membranes.

Ethan can defend his conclusion by stating that the change he observed, from a brown solid to a black powder, is a chemical change. He can refer to the definition of chemical properties and cite examples of other chemical changes to support his argument.

Ethan can defend his conclusion by stating that the change he observed, from a brown solid to a black powder, is a chemical change. Chemical changes involve the production of a different kind of matter from the original matter. In this case, the substance changed its color and composition when heated, indicating that a chemical reaction occurred.

Ethan can also refer to the definition of chemical properties, which are behaviors that are related to the change of one kind of matter into another kind of matter, further supporting his conclusion.

Furthermore, Ethan can cite examples of other chemical changes, such as rusting or food being cooked, digested, or rotting, to strengthen his argument that the observed change is a chemical change.

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Ethan can strengthen his conclusion about the chemical change by citing the color and state change, potential heat exchange, and could use Hess's Law to calculate the heat involved in this chemical change.

Ethan can defend his conclusion that the substance has undergone a chemical change by referring to the observed change in color and state from a brown solid to a black powder. This change in appearance is a strong indicator of a chemical change, as it suggests that a new kind of matter has been produced. Chemical changes are often accompanied by other types of observable changes such as the release or absorption of heat, which is an exothermic or endothermic process.

For example, a combustion reaction is an exothermic process that releases energy in the form of light and heat, like a burning oxyacetylene torch. On the other hand, an endothermic process absorbs heat, such as a cold pack used to treat muscle strains.

So, in his research, Ethan needs to further record if there's any heat exchange observed during this process. If there's a heat release or absorption, it gives more weight to his conclusion of this being a chemical change. Moreover, he could refer to Hess's Law to measure or calculate the heat involved in the chemical change for more concrete evidence.

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