Round off the measurement to three significant figures 12.17º C

Answer:

A double bond between carbon atoms

Explanation:

The suffix -ene is used for alkenes, which tells you that the molecule has a carbon-carbon double bond.

The answer is:

[tex]MolarConcentration=\frac{3.5moles}{volume(1.5L)}=2.33molar[/tex]

Since there is not information about the solute but only its mass, we need to assume that we are calculating the molar concentration of a solution or molarity. So, need to use the following formula:

[tex]MolarConcentration=\frac{mass(solute)}{volume(solution)}[/tex]

Now, we know that the mass of the solute is equal  3.5 moles and the volume is equal to 1500 mL or 1.5L

Then, substituting into the equation, we have:

[tex]MolarConcentration=\frac{3.5moles}{1.5L}=2.33molar[/tex]

Have a nice day!

Hey there!:

Molarity, molar concentration, concentration in mol/L or concentration in quantity of matter is the ratio of the amount of matter of the solute (mol) by the solution volume (in liters), expressed in the Unit mol/L (molar).

Number of moles  = 3.5 moles

1 L = 1000 mL

Volume in liters  = 1500 mL / 1000 =>  1.5 L

Therefore:

Molarity = number of moles / Volume in liters:

Molarity = 3.5 / 1.5

Molarity =  2.333 M

Hope this helps!

Answer:

[Ar] 4s2 3d10 4p3

Explanation:

Arsenic is Element 33. It is the 15th element in the Fourth Row, following the noble gas Ar at the end of the Third Row.

Thus, its noble gas electron configuration is

[Ar] 4s2 3d10 4p3

Answer: B. Detecting the presence of humans trapped under collapsed buildings.

Explanation: Infrared sensors are also capable of measuring the heat being emitted by an object and detecting motion. Infrared technology is found not just in industry, but also in every-day life. Televisions, for example, use an infrared detector to interpret the signals sent from a remote control.

Answer:

Explanation:

Aqua regia is a strong and very concentrated acid formed by mixing Hydrochloric acid(HCl) and nitric acid.

The acid is very corrosive due to its formulation and it nearly reacts to dissolve all substances including the unreactive gold metal. It is formed by mixing the two acids in a proportion of 1:3, i.e HCl in 3 parts and nitric acid in 1 part.

The mixture dissolves a wide range of metals

Answer:

B. Chemicals can keep bread fresher longer.

Explanation:

I checked the label of my bread  :)) and I found one ingredient which keep the freshness:  

ascorbic acoid (vitamin C) - it has antioxidant properties

Answer:

Chemicals can keep bread fresher longer.

Answer:

Total of all numbers added with the correct rounding and number of significant figures

Explanation:

1. Add up all the numbers

8.32+8.00+8.30+8.3

2. Determine how many significant figures should be in your final answer. When it comes to addition, it will be the fewest number of decimal places. since 8.3 has one decimal place, your final answer should only have one decimal place.

3. Round your final answer to the nearest tenths

Give the numbers that we have to add up.

Answer:

It determines how the molecule functions.- B.

The shape of a molecule affect the molecule involved in living systems by determining its molecular fractions. The correct answer is B. It determines how the molecule functions.

The shape of a molecule plays a crucial role in how it interacts with other molecules and biological systems. The three-dimensional structure of a molecule determines its chemical properties and how it interacts with receptors, enzymes, proteins, and other molecules within living systems. Here are a few ways in which the shape of a molecule affects its involvement with living systems:

Binding and recognition: The shape of a molecule is important for specific molecular recognition and binding interactions. For example, enzymes bind to specific substrates through complementary shapes, allowing them to catalyze chemical reactions. Similarly, receptors in cells recognize and bind to specific molecules, such as hormones or neurotransmitters, based on their shape.

Biological activity: The shape of a molecule can determine its biological activity. Small changes in the molecular structure, even in the form of stereochemistry or chirality (mirror image isomers), can significantly alter a molecule's biological activity. Enantiomers, which have identical chemical formulas but differ in their three-dimensional arrangement, can have different biological effects due to their distinct interactions with biological systems.

Pharmacokinetics: The shape of a molecule affects its absorption, distribution, metabolism, and excretion within an organism. The size and shape of a drug molecule, for instance, can determine its ability to cross biological barriers, interact with target molecules, and be metabolized or eliminated from the body.

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Answer:

Explanation:

You don't normally do this, but you might start by balancing the complex ion which is NO3^-

There are 2 of these on the right side of the arrow so make two on the left.

CaO + 2HNO3 arrow Ca(NO3)2 + H2O

That looks balanced. Let's check it out.

Species             Ca             H              NO3            O

Left                     1                2               2                 1     on the CaO

Right                   1                2               2                 1    on the H2O

Answer:

CaO + 2HNO3 ——-> Ca(NO3)2 +H2O

Explanation:

No precipitate will form in the reaction between NaNO3(aq) and Li2SO4(aq). Both the products, sodium sulfate and lithium nitrate, are soluble in water as per most solubility rules.

In the reaction between NaNO3(aq) and Li2SO4(aq), no precipitate will form. This is because both sodium sulfate (Na2SO4) and lithium nitrate (LiNO3), the products of this reaction, are soluble in water. According to solubility rules, most nitrates (NO3-) and sulfates (SO4 2-) are soluble, meaning they dissolve in water, hence no precipitate will form.

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In the reaction between NaNO3 (aq) and Li2SO4 (aq), no precipitate will form.

In the reaction between NaNO3(aq) and Li2SO4(aq), a precipitate will not form. This is because both NaNO3 and Li2SO4 are soluble in water and will dissociate into ions when mixed. This means that no insoluble products are formed and there will be no precipitate.

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Answer:

8.41

Explanation:

ap#3

Answer:

Gamma Radiation maybe

Explanation:

The atomic particles given off as a result of nuclear fission are Beta and Alpha particles, so the only thing left is gamma radiation.

I hope this helps, and as always, I am joyous to assist anyone at any time.

Answer: D

Explanation:

Just took the test

Final answer:

Niels Bohr's contribution to atomic theory was his proposal of the Bohr's Model, which introduced the concept of electron orbits and explained the atomic spectrum of hydrogen.

Explanation:

Niels Bohr made significant contributions to atomic theory by proposing a model of the atom in 1913 called the Bohr's Model. This model incorporated Rutherford's planetary model and explained the atomic spectrum of hydrogen. Bohr's model was based on the concept that electrons move around the nucleus in circular orbits at certain allowed radii, and it introduced quantum mechanics principles. However, it is important to note that Bohr's model has been superseded by more accurate and complex models in modern atomic theory.

You use the information given by the question about latent heat of fusion of ice and construct the following reasoning:

if you need              3.36 × 10⁵ J to melt 1 kg of ice

then you need                      X  J to melt 13 kg of ice

X = (13 × 3.36 × 10⁵)/1 = 43.68  × 10⁵ J = 4.368  × 10⁶ J ≈ 4.37 × 10⁶ J

Answer : The amount of heat required is, (C) [tex]4.37\times 10^6J[/tex]

Explanation :

Formula used :

[tex]q=L\times m[/tex]

where,

q = heat required = ?

L = specific latent heat of fusion of ice = [tex]3.36\times 10^5J/kg[/tex]

m = mass of ice = 13.00 kg

Now put all the given values in the above formula, we get:

[tex]q=(3.36\times 10^5J/kg)\times (13.00kg)[/tex]

[tex]q=4.37\times 10^6J[/tex]

Therefore, the amount of heat required is, [tex]4.37\times 10^6J[/tex]

Answer: C. The number of protons

Explanation: because when you take or add protons to an element it becomes another element.

Answer:Iodine in hexane

Explanation:

An electrolyte is a solution that decomposes upon passage of direct current. An electrolyte must contain ions that dissociate under the influence of external direct current. Solution of ionic substances in polar solvents produce good electrolytes such as a solution of NaCl in water. However, a solution of a nonpolar substance such as iodine in a nonpolar solvent such as hexane is not an not electrolyte. Such solutions contain no ions and do not interact with direct current.

Nonelectrolytes are substances that don't ionize in water and don't conduct electricity. An example is Iodine in hexane because when it is dissolved, it does not produce ions contrary to other given examples which are electrolytes.

Nonelectrolytes are substances that don't ionize in water and therefore don't conduct electricity. An example of a nonelectrolyte solution would be Iodine in hexane (D). This is because when iodine is dissolved in hexane, it doesn't produce ions. Other examples given, Sodium nitrate in water (A), Hydrogen chloride in water (B), and Acetic acid in water (C) are all examples of electrolytes because they produce ions when dissolved in water.

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Answer:

cation

Explanation:

Answer:

Cation

Explanation:

Cation is the name of an ion with a positive charge.

Cation is made electron loss.

Also, it means atoms forced into position or gained.

Answer:

they are single cells that lack a nucleus and tend to live in extreme conditions.- B.

Answer:

Option (B).

Explanation:

Archaebacteria includes all the single celled prokaryotic organisms that are found in different shapes and size. These bacteria are more closely related to eukaryotes.

Archaebacteria can live in extreme conditions like hot hydrothermal vents, under highly acidic and alkaline conditions. Archaebacteria does not have any nucleus and membrane bound organelles.

Thus, the correct answer is option (B).

The answer is in the photo

Answer : The moles of [tex]CO_2[/tex] produced are, 3.462 moles.

Explanation : given,

Mass of [tex]C_6H_6[/tex] = 45.0 g

Molar mass of [tex]C_6H_6[/tex] = 78 g/mole

First we have to calculate the moles of [tex]C_6H_6[/tex].

[tex]\text{Moles of }C_6H_6=\frac{\text{Mass of }C_6H_6}{\text{Molar mass of }C_6H_6}=\frac{45.0g}{78g/mole}=0.577moles[/tex]

Now we have to calculate the moles of [tex]CO_2[/tex]

The given balanced chemical reaction is,

[tex]2C_6_H6+15O_2\rightarrow 12CO_2+6H_2O[/tex]

From the balanced chemical reaction, we conclude that

As, 2 moles of [tex]C_6H_6[/tex] react to give 12 moles of [tex]CO_2[/tex].

So, 0.577 moles of [tex]C_6H_6[/tex] react to give [tex]\frac{12}{2}\times 0.577=3.462[/tex] moles of [tex]CO_2[/tex].

Therefore, the moles of [tex]CO_2[/tex] produced are, 3.462 moles.

Answer:

Here's what I get  

Explanation:

The etching gel used in many dental procedures contains  

Answer:

[H⁺] = 3.02 x 10⁻¹⁰M

Explanation:

Given parameters:

pH of the solution = 9.52

Unknown:

Concentration of the solution

Solution

There is a relationship between the pH and concentration of a solution.

                     pH = -log₁₀[H⁺]

The unknown here is [H⁺],

Now making it the subject of the formula

           [H⁺] = Inverse log₁₀(-pH)

           [H⁺] = Inverse log₁₀(-9.52)

              [H⁺] = 3.02 x 10⁻¹⁰M

These are 6 questions and 6 answers, each with its explanation.

Answer:

Explanation:

a. 0.7540

When there are not digits (non-zero digits) before the decimal point, the significant digits are all the decimal digits from the first non-zero decimal. So, in this case, they are all the shown digits: 7, 5, 4, and 0, i.e. 4 significant figures.

b) 12500

When there is not decimal point, the significant digits include all the digits before only zeros appear. So, they are 1, 2, and 5, i.e. 3 significant figures.

When it is meant that all the digits are significan, a perod must be added, in this way: 12500. The last point is part of the number, it does not add value, but indicates that all the digits are significant.

c) 10000.01

This is the only number from the list with both decimal and non-decimal digits.

When there are digits before and after the decimal point, the significant digits include all the digits before the decimal point and all the decimal digits. So they are 1, 0, 0, 0, 0, 0, and 1, i.e. 7 significant digits.

d) 1200

Again, when there is not decimal point, the significant digits include all the digits before only zeros appear. So, they are 1 and 2, i.e. 2 significant figures.

The two last zeros do not count as significant digits. If the number were written 1200., i.e. showing a decimal point but without digits after the decimal point, then all the four digits were singnificant.

e) 1.04 × 10⁴

This number is written in scientific notation.

The numbers before the power of 10 are called mantissa.

For a number written in scientific notation, the significant digits are the digits in the mantissa, i.e. 1.04. So, the number of significant digits is 3 (1, 0, and 4).

f) 0.0080050

For a number with only decimal digits (there are not digits with value before the decimal point), the zeros after the decimal point and before the first non-zero digit do not count as significant figures. So, the significant figures are: 8, 0, 0, 5, and 0, i.e. 5 significant figures.

Answer:

236588 cm3

Explanation:

If a large recipe calls for 250 quarts of milk, there are 236588 cm3.

Multiply the volume value by 946.353

Answer:

Explanation:a cells state potential of the cell is the standard state conditions 1 mole per liter (1 m) and pressure of atmospheric 25oC

Iron is unsuitable for fuel cell electrodes due to its reactivity and corrosion, whereas platinum is favored for being inert and stable in electrochemical reactions.

Iron is not a suitable metal for the electrodes of a fuel cell because it is reactive and can undergo corrosion, especially when in contact with water, leading to the degradation of the cell's performance. Instead, platinum is often used for electrodes because it is an inert metal that does not react during redox processes. This ensures that the platinum electrodes do not appear in the overall electrochemical reaction of the cell, thus maintaining their integrity and the efficiency of the fuel cell.

Answer:

6.022 x 10^23

Explanation:

There are 6.022 x 10^23 electrons that may bank in 1.6 g of methane.

10×6.023×10²²

6.023 ×10²³

Answer:

6.02 × 10^23

Explanation:

Number of moles of methane = 1.6/16 = 0.1

In one mole there are 6.02 × 10^23 atoms

Thus, in 0.1 mole there are 0.1 ×6.02 × 10^23 atoms =6.02 × 10^22 atoms

Hence total number of electrons = number of electrons present in CH4 × atoms present in 0.1 mole.

=10×6.02 × 10^22 =6.02 × 10^23

Answer:

As frequency increases, energy increases

Explanation:

The energy of electromagnetic waves increases as frequency increases. It is the wavelength that decreases when the energy of electromagnetic waves increases.

We can say a direct relationship exists between frequency and energy of electromagnetic waves.

The high energy waves in an electromagnetic spectrum are x-rays, ultraviolet rays etc. These waves also have a high frequency.

Frequency is the number of waves that passes a particular point per seconds. The more the frequency or the number of waves passing through, the more energy it is able to produce and release.

Answer:

Explanation:

Oxidation state of Cr in CrPO₄

As a general rule, the algebraic sum of all the oxidation numbers of all atoms in a neutral compound is zero.

The compound above is in its neutral state and we sum all the oxidation numbers and equate to zero:

The oxidation number of P is -2

                                           O is -2

Let the oxidation number of Cr be x:

                              x + (-2) + 4(-2) = 0

                              x -2-8 = 0

                               x -10 = 0

                                x = +10

For Cr in Cr₃(PO₄)₂

         Using the same rule:

        2(x) + 2[-2 + 4(-2)] = 0

           2x + 2(-2-8) = 0

            2x -20 = 0

                x = +10

Answer:

[tex]CrPO_4: Cr +3\\Cr_3(PO_4)_2: Cr+2[/tex]

Explanation:

[tex]CrPO_4[/tex] and [tex]Cr_3(PO_4)_2[/tex] are compounds known as ternary salts

This means that they are formed by a metal or a non-metal and an anion

 Its formula is [tex]M_x(X_yO_z)_w[/tex], that is, the cation is written first and then the anion and the simplified charges are exchanged if possible.

The anion [tex]PO_4[/tex] has a load of -3: [tex]PO_{4}^{-3}[/tex]

Let's look at the first compound [tex]CrPO_4[/tex] we observe that when exchanging the charges 3 of the[tex]PO_4[/tex] does not appear therefore the charges are simplified as the charges are completely simplified, it means that the chromium has the same valence (numerically but with opposite sign) that the anion

Therefore the oxidation state of Cr in [tex]CrPO_4[/tex] is +3

Let's look at the second compound [tex]Cr_3(PO_4)_2[/tex], it is observed that when exchanging the valences, the 3 of the [tex]PO_4[/tex] is with the chromium, and with the anion is  2

As valencia are not multiples, they cannot be simplified.

When exchanging the valences, the[tex]PO_4[/tex] has the valence corresponding to the chromium which in this case is + 2

Answer:

16.8 cups

Explanation:

We are given that there are 4.2 cups in in 1 liter of a liquid and we are to find out the number of cups that there will be in 4 liters.

To find this out, we will use the ratio method.

We know that:

1 L = 4.2 cups

So we can write it as:

[tex]\frac{1L}{4 L} =\frac{4.2 cups}{x}[/tex]

[tex] x = 4 .2 \times 4[/tex]

[tex] x = 1 6 . 8 [/tex]

Therefore, there are 16.8 cups in 4 liters.

16.8 cups are in 4 liters. A conversion factor is a ratio that allows you to convert a quantity expressed in one unit to an equivalent quantity expressed in another unit.

It is used in various fields, such as physics, chemistry, engineering, and everyday measurements. Conversion factors are derived from the relationships between different units of measurement.

1 liter is equivalent to 4.2 cups. This conversion factor tells that for every 1 liter, we have 4.2 cups.

To find out how many cups are in 4 liters, multiply 4 liters by the conversion factor of 4.2 cups per liter:

4 liters x 4.2 cups/liter = 16.8 cups

So, 4 liters would have 16.8 cups. This means that if  4 liters of liquid are into cups, need 16.8 cups to hold it all.

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Answer:

The answer is A: Earth casts a shadow on the moon.

Explanation:

A lunar eclipse occurs when the earth passes between the sun and the moon, and the three of them are aligned. As the light of the moon that we see from the earth is actually the reflection of the sun's rays on it, when the earth is between the moon and the sun, it doesn't let the sun's rays to reach the moon, so what we see is the shadow of the earth over the moon.