Which of these indicates that a liquid has transferred thermal energy to the air?

Answer:

The molar mass of potassium oxide, aka K20 would be option C. 94.0g

Explanation:

The molar mass of potassium oxide (K₂O) is 94.20 g/mol, matching option C (94.0 g).

To find the molar mass of potassium oxide (K₂O), we need to sum the molar masses of the constituent elements.

Therefore, the molar mass of potassium oxide (K₂O) is 94.20 g/mol, which is closest to option C (94.0 g).

Answer: fruit salad

Explanation: it consists of different types of materials.

Among the following options, heterogeneous mixture is a fruit salad. The correct answer is D.

A heterogeneous mixture is a type of mixture in which the components are not uniformly distributed and can be visibly distinguished. In other words, the different substances or phases that make up the mixture are not evenly mixed at a microscopic level.

In a fruit salad, different fruits are mixed together, and their distinct components can be observed separately. The different fruits retain their individual characteristics and do not dissolve or blend completely with each other.

On the other hand, options A, B, and C are examples of homogeneous mixtures. In a homogeneous mixture, the composition is the same throughout the mixture, and there are no visible boundaries or phases.

Therefore, the correct choice for a heterogeneous mixture is option D) A fruit salad.

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Answer:

It conducts electricity when it is dissolved in water.

Explanation:

It conducts electricity when it is dissolved in water is a property of a substance that is composed of atoms that are held together by ionic bonds.

The property of a substance that is composed of atoms that are held together by ionic bonds. As soon as it is dissolved in water, it conducts electricity.

Ionic bonds are defined as the type of chemical compound connection created by the electrostatic attraction of ions with opposing charges. Ionic bonds are important because they enable the production of particular organic molecules, ionic bonds are significant.

A material's electrical conductivity, or capacity to carry a current, is a measure of how much electrical current it can carry. While electrical conductance is a characteristic of a specific electrical component, electrical conductivity is a quality of the substance itself. How much voltage is needed to for a certain quantity of electric current to flow can be used to determine electrical conductivity.

Thus the property of a substance that is composed of atoms that are held together by ionic bonds. As soon as it is dissolved in water, it conducts electricity.

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Since fire was discovered have people studied chemistry

Chemistry is a science that is dedicated to the study of the following topics:

It is one of the oldest sciences in the world because it is considered that it began with the first individuals who manipulated and discovered fire.

Over time it has evolved and many scientists have found different important knowledge such as the states of matter, the chemical elements of the earth, radioactivity, chemical reactions between elements and other knowledge.

According to the above, the correct answer is C. because it mentions the event considered as the beginning of the study of chemistry.

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Answer:

since was fire was discovered

Explanation:

Answer:

D. The coefficients tell the ratio of moles of reactants used in the reaction

Explanation:

The molar ratio is central to all stoichiometric calculations.

To get the mass of Compound B that reacts with compound A, you must

You must get over the "mole hill."

Answer:

Protons and neutrons form the nucleus of the atom with electrons orbiting it.- C.

The correct answer is C. Protons and neutrons form the nucleus of the atom with electrons orbiting it

Explanation:

Bohr model was proposed by Niels Bohr in 1913 to explain the structure of atoms, in this Bohr stated electrons (particles negatively charge) orbit the nucleus that contains both neutrons (neutral particles) and protons (positively charged particles). Additionally, according to this model electrons were placed in different levels of energy and orbit the nucleus constantly, resembling planets in the Solar System, although the Bohr model was the first one that integrated principles related to energy levels and changes in energy in electrons. Thus, Bohr proposed "Protons and neutrons form the nucleus of the atom with electrons orbiting it".

Answer:

Carbon dioxide, water, and heat.

Explanation:

Hydrocarbon combustion refers to the type of reaction where a hydrocarbon reacts with oxygen to create carbon dioxide, water, and heat. Hydrocarbons are molecules consisting of both hydrogen and carbon. They are most famous for being the primary constituent of fossil fuels, namely natural gas, petroleum, and coal.

Answer:

carbon dioxide, water vapor, and heat

Answer:

Explanation:

The heat energy required to heat a substance may be calculated from the formula:

Where:

Then, substitute the numbers in the formula to get:

Answer:

Explanation:

1) Balanced chemical equation:

2) Mole ratios:

3) Proportion:

4) Solve for x:

Answer: 20 moles of O₂ are consumed when 20 moles pf SO₂ are produced.

Answer:

Explanation:

25

Answer:

131 K

Explanation:

The only variables are volume and temperature, so we can use Charles' Law:

V1/T1 = V2/T2

Data:

V1 = 2.00 L; T1  = 210 K

V2 =  1.25 L; T2 = ?

Calculation:

2.00/210 = 1.25/T2

Multiply each side by the lowest common denominator (210T2)

2.00T2 = 1.25 ×210

2.00T2 = 262.5

       T2 = 262.5/2.00 = 131 K

The gas was cooled to 131 K.

Answer:

3Ag⁺ + 3NO₃⁻ + 3Na⁺ + PO₄³⁻ → Ag₃PO₄(s) + 3Na⁺ + 3NO₃⁻

Explanation:

An ionic equation is a chemical equation where the electrolytes in aqueous solution are expressed as dissociated ions.

For the reaction:

3AgNO₃(aq) + Na₃PO₄(aq) → Ag₃PO₄(s) + 3 NaNO₃(aq)

AgNO₃(aq), Na₃PO₄(aq) and NaNO₃(aq) are dissociated in water thus:

AgNO₃(aq) → Ag⁺ + NO₃⁻

Na₃PO₄(aq) → 3Na⁺ + PO₄³⁻

NaNO₃(aq) → Na⁺ + NO₃⁻

The ionic equation is:

3Ag⁺ + 3NO₃⁻ + 3Na⁺ + PO₄³⁻ → Ag₃PO₄(s) + 3Na⁺ + 3NO₃⁻

I hope it helps!

Answer:

1, 3, 2

Explanation:

N2 + H2 → NH3

I usually find that the best way to systematically balance an equation by inspection is to start with the most complicated-looking formula and then balance atoms in the order:

(a) The most complicated formula is NH3.

(b) Balance N.

We have 1 H in NH3, but 2 N on the left. We need 2 N on the right. Put a 1 in front of N2 and a 2 in front of NH3.

1N2 + H2 → 2NH3

(c) Balance H.

We have fixed 6 H on the right, so we need 6 H on the left. Put a 3 in front of H2.

1N2 + 3H2 → 2NH3

The equation is now balanced, and the coefficients are 1, 3, 2.

Answer:

4.81×10⁻⁴ g K

Explanation:

Convert atoms to moles:

7.40×10¹⁸ atoms K × (1 mol K / 6.02×10²³ atoms) = 1.23×10⁻⁵ mol K

Convert moles to mass:

1.23×10⁻⁵ mol K × (39.1 g K / mol K) = 4.81×10⁻⁴ g K

Answer:

0.114 moles

Explanation:

Calculate available moles of Fe:

0.171 mol Fe₂O₃ × (2 mol Fe / mol Fe₂O₃) = 0.342 mol Fe

Now calculate moles of Fe₃O₄ needed:

0.342 mol Fe × (1 mol Fe₃O₄ / 3 mol Fe) = 0.114 mol Fe₃O₄

Answer:

its write for the first person who did it

Explanation:

Answer:

Reaction 1: 3700

Reaction 2: 3200

pt 2

Reaction 1: 0.00823

Reaction 2: 0.00397

pt 3

reaction 1: -450

reaction2: -81

Explanation:

Answer:

Decrease the volume or increase the number of moles by a factor of 37.

Explanation:

If the contents are a gas,

pV = nRT

If T is constant

[tex]p \propto \dfrac{n}{V}[/tex]

There are two ways to increase the pressure inside the container.

1. Decrease the volume

If you decrease the volume by a factor of 37, the pressure will increase by the same factor.

2 Increase the number of moles

If you add 36 times the number of moles, you will have 37n moles. Increasing the amount of gas by a factor of 37 increases the pressure by the same factor.

To increase the pressure inside a container by a factor of 37 while keeping the temperature constant, the volume of the gas must be reduced to 1/37th of its original volume, as per Boyle's Law, which states that pressure and volume are inversely proportional.

Assuming the temperature is held constant, to increase the pressure inside a container by a factor of 37, you must reduce the volume of the gas. This is based on Boyle's Law, which states that, for a given mass of gas at constant temperature, the pressure of the gas is inversely proportional to its volume. This means if you want to increase the pressure inside the container, you have to decrease the volume of the container correspondingly.

For instance, if the original pressure of the gas is P, and the volume is V, to increase the pressure by a factor of 37 (making it 37P), you would need to reduce the original volume (V) to V/37. This is because P1*V1 = P2*V2, where P1 and V1 are the initial conditions and P2 and V2 are the final conditions, assuming no change in the amount or temperature of the gas.

Answer:

0.39L

Explanation:

Given parameters:

Initial volume of gas V₁ = 2.6L

Initial pressure on gas P₁ = 1.6atm

Final volume of gas V₂ = ?

Final pressure on gas P₂ = 10.6atm

Solution

Applying Boyle's law which states that "the volume of a fixed mass of a gas varies inversely as the pressure changes if the temperature is constant".

Mathematically;

                      P₁V₁ = P₂V₂

                      V₂ = [tex]\frac{P_{1}V_{1} }{P_{2} }[/tex]

                      V₂ =  [tex]\frac{1.6 x 2.6 }{10.6 }[/tex] = 0.39L

Answer:

[tex]\boxed{\text{Pressure and volume}}[/tex]

Explanation:

The measure of R is always the same, but the numbers may differ depending on the units you use.

For example, in SI units, R = 8.314 Pa·m³K⁻¹mol

If your measurement uses different units, you must either convert your units to SI or use a value of R consistent with your units.

If you use bars and litres,                       R = 0.083 14   bar·L·K⁻¹mol⁻¹.

If you use kilopascals and litres,            R = 8.314        kPa·L·K⁻¹mol

If you use atmospheres and litres,        R = 0.082 06 L·atm·K⁻¹mol⁻¹.

If you use Torr and cubic centimetres, R = 62 368     Torr·cm³ K⁻¹mol⁻¹.

The only units that don't change are "K⁻¹mol⁻¹".

[tex]\text{The quantities that affect the value of R are }\boxed{\textbf{pressure and volume}}[/tex]

Answer:

[tex]\boxed{\text{163.3 L}}[/tex]

Explanation:

The pressure is constant, so, to calculate the volume, we can use Charles' Law:

\dfrac{V_{1}}{T_{1}} = \dfrac{V_{2}}{T_{2}}

Data:

V₁ = ?;            T₁ =    450 K

V₂ = 103.4 L; T₂ = 284.9 K

Calculation:

[tex]\dfrac{ V_{1}}{450} = \dfrac{ 103.4}{284.9}\\\\{ V_{1}} = 450 \times \dfrac{103.4}{284.9}\\\\ = \textbf{163.3 L}\\\text{The original volume of the helium was $\boxed{\textbf{163.3 L}}$}[/tex]

The original volume of the gas is 186.94 Liters

Further Explanation;

That is;[tex]V\alpha T[/tex]

[tex]P=kT[/tex],  where k is a constant

At different temperatures and pressure then;

[tex]\frac{V_{1} }{T_{1} } =\frac{V_{2} }{T_{2} }[/tex]

In the Question;

We are given

[tex]V_{1} = ?\\T_{1} = 450\\V_{2} = 103.4 l\\T_{2} =248.9K[/tex]

Therefore;

[tex]V_{1} =\frac{V_{2} T_{1} }{T_{2} }[/tex]

[tex]V_{1} =\frac{(103.4 L)(450 K)}{(248.9K)}[/tex]

[tex]V_{1} = 186.94Liters[/tex]

That is;

[tex]P\alpha \frac{1}{V}[/tex]

[tex]P\alpha \frac{k}{V}[/tex], where k is a constant

[tex]\frac{P_{1}V_{1} }{T_{1} } = \frac{P_{2}V_{2} }{T_{2} }[/tex]

Keywords: Combined gas laws, Boyle's law and Charles's law

Level: High school

Subject: Chemistry

Topic: Gas laws

Sub-topic: Charles's law

Answer:

The correct answer would be Food.

The chemical reaction has been the formation of product with the reaction of reactants. The chemical reaction has been differentiated as synthesis, decomposition, replacement reaction.

The following reaction has been classified as:

The reaction has been following the synthesis of the product with a mixture of reactants. Thus, it has been given as the synthesis reaction.

There has been replacement of Ca by Ag in calcium chloride and replacement of Ag by Ca in silver nitrate. There has been two replacement. Thus, the reaction has been a double replacement reaction.

The reaction has replacement of Cu by Zn in copper sulfate. It has been a single replacement, thus the reaction has been a single replacement reaction.

There has breakdown of the compound for the formation of product. Thus, the reaction has been a decomposition reaction.

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Answer:

synthesis and combustion

double replacement

single replacement

decomposition only

Explanation:

in that order, i got it correct

13 An Ionic Bond

these are the characteristics of an ionic bond compounds like NaCl have these characteristics

14 substances could be compounds or elements hence not all substances are compounds

15 It is not water. The chemical composition of water is H2O not H202

(H202 is hydrogen peroxide and is toxic)