Compared to ultraviolet light, an electromagnetic wave that has a higher frequency will also have ________.

Answer:

Grinding, melting, dissolving, and evaporating are all physical changes. No new substance or substances are formed as a result of a physical change. A chemical change results in the formation of one or more “new” substances. These new substances differ in chemical properties and composition from the original substance.

Explanation:

A lab report on physical and chemical change would include an understanding of the two concepts, the procedures followed in the experiment and the results obtained. Physical changes involve a change in form, not in molecular composition, while chemical changes involve a change in molecular structure leading to the formation of a new substance.

A lab report on physical and chemical change involves first understanding these two key concepts. A physical change is a change in the form of a substance, but not in its molecular composition. Examples include changes in state, such as melting ice into water. A chemical change, on the other hand, involves a change in the substance's molecular structure, which leads to new substances being formed. For instance, when iron rusts in the presence of moisture, it forms a new substance, iron oxide.

To write the report, you'd first list the objectives of the experiment, the materials used, and the procedures followed. Data collected during the experiment should be detailed, and then results discussed and interpreted. Conclusions made should be based on the experiment's outcomes and evidence. Remember to always observe proper lab safety protocols and discuss these in your report too.

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Answer:

B.0.456 g

Explanation:

It is that becuase if u convert miligrams to grams it is 1000mg =1g

some of the alpha particles were deflected, most of the alpha particles were reflected, and a few of the alpha particles passed through the gold foil.

Answer:

b. Rutherford's experiment had the following results: a few of the alpha particles were deflected, some of the alpha particles were reflected, and most of the alpha particles passed through the gold foil.

Explanation:

Rutherford performed a series of experiments which marked an alpha particle beam on a thin gold foil and the scattering pattern was measured using a fluorescent screen. Alpha particles were detected bouncing off the gold foil in all directions, and some back at the source.

By firing alpha particles into the foils, he observe that only a small fraction of the alpha particles deflected and most flew directly through the foil.

Most rays were deflected because they pass very close to the center with an electric charge of the same type as alpha rays; very few bounced because centers of positive charge collided head-on.

Neutrons are very important in provide stability for an atom. When atoms are created by fusion, neutrons are included in this process. Because protons don't like each other and repel each other that's where neutrons come in.

answer: the role of a neutron in an atom holds the center of the atom so it provides the stability of the center of the atom.

hope this helps! ❤ from peachimin

The answer is d. Igneous rocks is indeed formed through the cooling of molten lava on the surface, making extrusive igneous rock. However, if those underground pockets of magma were to cool underneath the surface, because of its force to, it will still form intrusive igneous rock, slowly cooling.

The study of rocks is called petrology. There are different types of rocks and are igneous rock, magma, igneous rock and etc.

The correct answer is D which is cooled slowly and intrusive.

Igneous rocks are indeed formed through the cooling of molten lava on the surface, making extrusive igneous rock.

However, if those underground pockets of magma were to cool underneath the surface, because of its force, it will still form intrusive igneous rock, slowly cooling.

Hence, the correct answer is option D.

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The answer for this question is A

Explanation:

An atom consists of electrons, protons, and neutron. The protons and neutrons are present inside the nucleus whereas the electrons are present outside the nucleus.

These electrons revolve around the nucleus in circular motion. Therefore, an electron pair surrounds the central atom of a molecule. It is known that an electron contains a negative charge and like charges repel each other.

Hence, in an atom the force of repulsion between electron pairs pulls the atoms away from each other.

As a result, a molecules atoms are as far away from each other as they can get.

Answer:

forces between electron pairs push the atom apart

Explanation:

apex

Answer:

8.75 × 10³

Explanation:

Multiply the coefficients and the exponential terms separately; then multiply them together

2.5 × 3.5 = 8.75.

When you multiply exponential terms, you add the exponents.

10¹⁰ × 10⁻⁷ = 10⁽¹⁰⁻⁷⁾ = 10³

The product is 8.75 × 10³.

A scientific calculator does the operation automatically. The buttons may have different labels on your calculator, but the key sequence is usually something like

2.5 Exp 10 × 8.5 Exp +/- 7 = 8.75×10⁻³

Answer: Yes it is possible for two different compounds to be made from the exact two same elements.

Reason: Oxygen(O)+Oxygen(O)=Oxygen Gas(O2)

The main function of concept mapping is: C. Organization

A map can be defined as a representation of all or some parts of the Earth drawn to scale on a flat surface.

In Science, there are different types of map and these include;

A concept map can be defined as a visual representation of information and ideas, so as to depict (illustrate) the relationships between two or more concepts while organizing them.

Hence, main function of concept mapping is for the proper organization or structuring of information and ideas in a graphic format.

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By the mass percentage, [tex]100[/tex] grams of the sample would contain

Which corresponds to

Hence the approximate ratio [tex]n(\text{N}) : n(\text{C}) \approx 1 : 1[/tex] and the empirical formula [tex]\text{CN}[/tex].

Apply the idea gas formula to determine the number of moles of the gas molecules present in the [tex]462 \; \text{cm}^{3} = 0.462 \; \text{L} [/tex] sample:

[tex]\begin{array}{lll}n &= & (\text{P}\cdot \text{V}) / (\text{R} \cdot \text{T})\\ & = & 1.01 \times 10^2 \times 0.462 /(8.314 \times 273) \\ &= &0.0206\; \text{mol}\end{array}[/tex]

Thus

[tex]M = m / n = 1.048 / 0.0206 = 51.0 \; \text{g} \cdot \text{mol}^{-1}[/tex]

which is approximately twice of [tex]26.02\; \text{g} \cdot \text{mol}^{-1}[/tex], formula mass for the empirical formula [tex]\text{CN}[/tex]. Hence the molecular formula [tex]\text{C}_2\text{N}_2[/tex]

The molecular formula of the compound is C2N2.

From the ideal gas equation;

PV = nRT

P = 1.01 x 10^5 Pa or 1.01 atm

V = 462 cm^3 or 0.462 L

R = 0.082 atm Lmol-1K-1

T = 273 K

n = ?

n = PV/RT

n = 1.01 atm × 0.462 L/ 0.082 atm Lmol-1K-1 × 273 K

n =0.467 /22.386

n = 0.02086 moles

Now;

Molar mass of the compound  is obtained from;

number of moles  = mass/molar mass

molar mass = mass/number of moles

molar mass =  1.048g/0.02086 moles

molar mass = 50.24 g/mol

The empirical formula of the compound is;

C - 53.8%/12,         N - 46.2%/14

C - 4.48,                 N - 3.3

Dividing through by the lowest ratio

C -4.48/3.3            N - 3.3/3.3

C - 1                       N - 1

The empirical formula is CN

The molecular formula is obtained thus;

[12 + 14]n = 50.24

n = 50.24/26

n = 2

The molecular formula of the compound is C2N2

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Answer:

Mg+2     Its D

Explanation:

DDDDDDDDDDDDDDDDDD on edge 2020

Answer:

Its D.

Explanation:

Got it correct in the question.

Explanation:

A reversible reaction is a reaction which results in the formation of products which gives back reactants. Therefore, it is said that a reversible reaction occurs in both forward and backward direction.

Thus, it can be concluded that a reversible reaction is a reaction that takes place in the both directions . If the reaction were to equilibrium, the rate of the forward reaction would equal that of the reverse reaction.equilibrium.

A reversible reaction is a reaction that takes place in the both direction. If the reaction were to equilibrium, the rate of the forward reaction would equal that of the reverse reaction.

The reaction in which reactants is converted into products and products is converted into reactants simultaneously is called reversible reaction.

The equilibrium is takes place in reversible reaction when reversible reaction occurs in closed vessel.

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Answer : The initial quantity of sodium metal used is 17.25 grams.

Solution : Given,

Volume of [tex]H_2[/tex] gas = 8.40 L

Molar mass of Na metal = 23 g/mole

The Net balanced chemical reaction is,

[tex]2Na+2H_2O\rightarrow 2NaOH+H_2[/tex]

At STP,  22.4 L of volume is occupied by 1 mole of [tex]H_2[/tex] gas

so,  8.40 L of volume is occupied by = [tex]\frac{8.40L\times 1mole}{22.4L}[/tex] = 0.375 moles of [tex]H_2[/tex] gas

Now from the above reaction, we conclude that

1 mole of [tex]H_2[/tex] gas produced by the 2 moles of Na metal

0.375 moles of [tex]H_2[/tex] gas produced = [tex]\frac{2moles\times 0.375mole}{1mole}=0.75moles[/tex] of Na metal

The quantity of Na metal used = Moles of Na metal × Molar mass of Na metal = 0.75 moles × 23 g/mole = 17.25 grams

Therefore, the initial quantity of sodium metal used is 17.25 grams.

Answer:

17.2

Explanation:

took the test

Srry if I'm late the answer to the first question about chemical changes is B. when a new substance is formed, it's going to be chemical. For example, when you burn paper, it turns into ash, which is a new substance. The burning is a chemical change. C is wrong because you can undo the mixture.

For number 2, the trick is to check if there is a carbon is double bonded to another carbon. Then it would be unsaturated. You can also check if there's a kink the chain. So therefore,

saturated is 3-methl..  and propane

unsaturated is propyne heptyne and cyclpentene

good luck!

The statement that describes a Chemical changes in hematite is B. The hematite particles rearrange to form a new substance.

The statement that describes a chemical change in hematite is B. The hematite particles rearrange to form a new substance.

A chemical change involves the formation of new substances with different chemical properties.

In this case, the rearrangement of hematite particles leads to the formation of a new substance.

Example: When hematite (Fe2O3) is heated strongly, it undergoes a chemical change and turns into magnetite (Fe3O4).

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Answer: Option (C) is the correct answer.

Explanation:

According to collision theory, more is the number of collision between the reactant molecules more will be the rate of reaction.

For example, [tex]Mg + 2HCl \rightarrow MgCl_{2} + H_{2}[/tex]

When we increase the concentration of reactants then it means there is increase in number of molecules. Hence, more is the number of molecules more will be the number of collisions.

Thus, we can conclude that by increasing the concentration of Mg in the reaction mixture we increase the rate of collisions between the reactants in this reaction.

Answer:

C. Increase the concentration of Mg in the reaction mixture.

Explanation:

Answer:- Molar mass of [tex]CO_2[/tex] .

Solution:- It is a stoichiometry problem. Mass of the grill is 30.0 kg and the mass after burning the grill is also 30.0 kg. It means all the charcol is burned and the gas is given off.

2.0 kg of charcol are converted to grams which is 2000 g. Since charcol is pure solid carbon, the grams are divided by the atomic mass of carbon which is 12.

The combustion equation of charcol is written as:

[tex]C(s)+O_2(g)\rightarrow CO_2(g)[/tex]

From this balanced equation, there is 1:1 mol ratio between charcol and carbon dioxide. So, the moles of carbon dioxide gas formed are equivalent to the moles of charcol. To convert the moles of carbon dioxide to grams we multiply the moles by it's molar mass.

Carbon dioxide has one carbon and two oxygen atoms so it's molar mass = 12 + 2(16) = 12 + 32 = 44

So, 44 is the molar mass of carbon dioxide and above calculations clearly shows how and where we get this.

Since there is no decimal, any zeros that are not in between non-zero numbers are NOT significant.

So

7 - Sig

6- Sig

8- Sig

3- Sig

0- NOT SIG

0- NOT SIG

So, there are 4 sig figs.

A constant in any experiment is a variable that remains constant for the entire experiment, this constant helps to identify the other variables of the experiment and come to a conclusion. Here, in this experiment the number of days remains constant for the entire experiment which is 5 days as given in the options. Along with that the type of the plant, water amount, sunlight, 30 days of the whole experiment, and the number of plants remains the same for the entire experiment.

In the experiment the independent variable is the length of the old fish sticks aging , as per the study done by the experimenters the age of the old sticks will produce more compost which will result into taller eggplants. This will be independent of other variables in the experiment, as the decomposition of the fish sticks will be increased by everyday and the quality of the compost will also increase according to it, which will also produce taller eggplants. Here, the independent variables are 3, 6, 12 months .

The experiment which is considered for proving the hypothesis is that older fish sticks will give good quality of compost that will result into high production of taller eggplants. This will be supported by the experimental results by different individuals.

The growth of eggplant is the dependent variable in this experiment as it will be greatly influenced by other variables of the experiment. The variable which depends on other factors of experiment is called as the dependent variable. Here, in this case the height i.e. growth  of th eggplant is the dependent variable which will be the result of other varying factors of the controlled experiment.

Here we have to get the correct molecular formula of the compound.

The molecular formula of the compound is C₆H₆O₆ i.e. option C.

Let assume, the empirical formula of the compound is [tex](CHO)_{n}[/tex].

The given molar mass of the compound is 176.124 g/mole.

The percent of carbon in the compound is [tex]\frac{283.4}{692.5}[/tex]×100 = 40.924.

The percent of hydrogen in the compound is [tex]\frac{31.7}{692.5}[/tex]×100 = 4.577.

The percent of oxygen in the compound is [tex]\frac{377.4}{692.5}[/tex]×100 = 54.498.

Now the ratio of the atomic number in the compound for carbon is [tex]\frac{40.924}{12}[/tex] = 3.410

Now the ratio of the atomic number in the compound for hydrogen is [tex]\frac{4.577}{1}[/tex] = 4.577

Now the ratio of the atomic number in the compound for oxygen is [tex]\frac{54.498}{16}[/tex] = 3.406

So, the C, H and O lowest ratio is [tex]\frac{3.410}{3.406}[/tex] = 1, [tex]\frac{4.577}{3.406}[/tex] = 1 and [tex]\frac{3.406}{3.406}[/tex] = 1

Thus the empirical formula of the compound is [tex][CH_{1}O] _{n}[/tex] (where n = integer.

12n + 1n + 16n = 176.24

29n = 176.24

n = 6 (approx)

Thus the molecular formula of the compound is C₆H₆O₆.

Final answer:

By calculating the number of moles of carbon, hydrogen, and oxygen and deriving the ratio among them, it is determined that the molecular formula of the compound with a molar mass of 176.124 grams/mole is C6H8O6 (D).

Explanation:

To find the molecular formula of the compound used as a food additive with a molar mass of 176.124 grams/mole from the given decomposition data, we first need to calculate the number of moles of each element present in the given sample.

For carbon: (283.4 g) / (12.0 g/mol) = 23.62 moles
For hydrogen: (31.7 g) / (1.0 g/mol) = 31.7 moles
For oxygen: (377.4 g) / (16.0 g/mol) = 23.59 moles

Next, we divide by the smallest number of moles to get the atom ratio.
C: 23.62 / 23.59 ≈ 1
H: 31.7 / 23.59 ≈ 1.34
O: 23.59 / 23.59 = 1

The ratio of hydrogen is not a whole number, so we multiply all ratios by the smallest whole number that gives us whole number ratios for each element, which in this case would be 3 (since 1.34 is approximately 4/3).

After multiplying, the moles of each element become:
C: 1 x 3 = 3
H: 1.34 x 3 ≈ 4
O: 1 x 3 = 3

Thus, the empirical formula of the compound is C3H4O3, and the molecular formula is the same as the empirical formula because the molar mass of C3H4O3 (3(12.0) + 4(1.0) + 3(16.0) = 88.0 g/mol) is half that of the given molar mass. Therefore, the molecular formula must be C6H8O6, which is twice the empirical formula.

The correct molecular formula of the compound is D. C6H8O6.

Moles of a gas = 0.500

Volume = 2.50 L

Pressure = 13. atm

Temperature = ?

Solution:

Formula:

                       PV = n RT

Putting the values in formula:

 T = PV/nR = 13 * 2.5 / 0.5 *  0.082057

   =  32.5/0.041 = 792.68 K

                    T = 792.68 K

The deepest, the solid iron-nickel core at the center.

The earth layers are crust, lithosphere, mantle, outer core, and inner core. But the inner core of earth experiences the greatest pressure. This layer also has the highest temperature.

Answer: 5.5

The alien planet has unfamiliar names for substances and units of measures.  

8 quibs of the substance called skwarnick has been obtained.

According to the units of  measurement used in the alien planet,

13 quibs equal to 9 sleps

Therefore, 1 quib =[tex]\frac{9}{13}sleps[/tex]

Thus, 8 quibs of skvarnick = [tex]\frac{9}{13}[/tex] x 8 = 5.5 sleps.

For this reason, 8 quibs of skvarnick in units of sleps is 5.5 sleps.

Answer:

5.3 × 10⁻¹⁷ mol·L⁻¹

Explanation:

Let s = the molar solubility.

                Cu₂S(s) ⇌ 2Cu⁺(aq) + S²⁻(aq); K_{sp} = 6.1 × 10⁻⁴⁹

E/mol·L⁻¹:                        2s             s

K_{sp}  =[Cu⁺]²[S²⁻] = (2s)²×s = 4s^3 = 6.1 × 10⁻⁴⁹

[tex]s^{3}= \frac{6.1 \times 10^{-49}}{4} = 1.52 \times 10^{-49}[/tex]

[tex]s = \sqrt[3]{1.52 \times 10^{-49}} \text{ mol/L} = 5.3 \times 10^{-17} \text{ mol/L}[/tex]

The solubility of copper(I) sulfide, Cu2S, in water, given its Ksp value of 6.1 × 10^-49, is calculated to be approximately 1.15 × 10^-17 mol/L. by understanding the dissolution process and solving the Ksp expression.

The question asks about the solubility of copper(I) sulfide, Cu2S, given its Ksp value is 6.1 × 10^-49. To solve for the solubility in mol/L, we must first understand the dissolution process of Cu2S in water. The equation for this process is Cu2S(s) → 2 Cu+(aq) + S2-(aq). For every mole of Cu2S that dissolves, it produces 2 moles of Cu+ and 1 mole of S2-. Therefore, if the solubility of Cu2S is 's' mol/L, the concentration of Cu+ ions is 2s mol/L, and the concentration of S2- ions is s mol/L.

Substituting these values into the Ksp expression gives: Ksp = [2s]^2[s] = 4s^3. Plugging in the Ksp value of 6.1 × 10^-49 and solving for 's' provides: 4s^3 = 6.1 × 10^-49, leading to s^3 = 1.525 × 10^-49 and s ≈ 1.15 × 10^-17 mol/L. Therefore, the solubility of copper(I) sulfide, Cu2S, in water is approximately 1.15 × 10^-17 mol/L.