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3 years ago

Which process is a chemical change? breaking of glass formation of frost magnetization of an iron nail loss of atmospheric ozone

Chemistry

2 answers:

Elenna [48]3 years ago

3 0

The answer is "D" loss of atmospheric ozone

Anna35 [415]3 years ago

3 0

Answer:

The answer is loss of atmospheric ozone

Explanation:

There are two types of change in chemistry, they are physical and chemical change.

Physical changes are characterized by the following

they are easily reversible
no new substance is formed
they cannot be represented by a chemical equation

Chemical changes are characterized by the following

they are not easily reversible
new substances are mostly formed
they are usually represented by chemical equations

When a glass breaks, the broken parts are still glasses, no new particle is formed and we can't represent the process with a chemical equation

Frost are just iced-water crystals that are formed on objects in an open environment. They are formed from water and as such they reverse back to water (no new substance is formed) when the temperature increases and the process cannot be represented by a chemical equation.

The nail that has been attracted by a magnet can be easily removed and no new substance is formed in the process. The process of magnetization cannot be represented by a chemical equation

The loss of atmospheric ozone is a chemical process because ozone cannot be easily formed/broken as this requires several processes. During depletion of ozone (O3), oxygen gas (O2) is formed hence a new substance is formed and this process can be represented with the use of chemical equation. Let's take the depletion of ozone by chlorofluorocarbon (CFCs) as an example.

When CFCs are broken by sunlight, they break up into there components and chlorine (Cl) is released and when that occurs, the following reaction takes place after the break up

Cl + O3 ⇒ ClO + O2

we can see from the chemical equation above that depletion of atmospheric ozone is a chemical process

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Why can characteristics properties be used to identify unknown substances

frozen [14]

Characteristic properties are used because the sample size and the shape of the substance does not matter.

5 0

2 years ago

The question is in the picture below

Rus_ich [418]

Answer:

$\Delta\text{H}_1+2\Delta\text{H}_2-\Delta\text{H}_3$

Explanation:

Hess's Law of Constant Heat Summation states that if a chemical equation can be written as the sum of several other chemical equations, the enthalpy change of the first chemical equation is equal to the sum of the enthalpy changes of the other chemical equations. Thus, the reaction that involves the conversion of reactant A to B, for example, has the same enthalpy change even if you convert A to C, before converting it to B. Regardless of how many steps it takes for the reactant to be converted to the product, the enthalpy change of the overall reaction is constant.

With Hess's Law in mind, let's see how A can be converted to 2C +E.

$\bf{\text{A} \rightarrow 2\text{B}}$ (Δ $\text{H}_1$ ) -----(1)

Since we have 2B, multiply the whole of II. by 2:

$\bf{2\text{B} \rightarrow 2\text{C} +2\text{D}}$ (2Δ $\text{H}_2$ ) -----(2)

This step converts all the B intermediates to 2C +2D. This means that the overall reaction at this stage is $\text{A} \rightarrow 2\text{C} +2\text{D}$ .

Reversing III. gives us a negative enthalpy change as such:

$\bf{2\text{D} \rightarrow \text{E}}$ (-Δ $\text{H}_3$ ) -----(3)

This step converts all the D intermediates formed from step (2) to E. This results in the overall equation of $\text{A} \rightarrow 2\text{C} +\text{E}$ , which is also the equation of interest.

Adding all three together:

$\text{A} \rightarrow 2\text{C}+\text{E}$ ( $\bf{\Delta\text{H}_1+2\Delta\text{H}_2-\Delta\text{H}_3 }$ )

Thus, the first option is the correct answer.

Supplementary:

To learn more about Hess's Law, do check out: brainly.com/question/26491956

4 0

1 year ago

List the 3 mole equalities.

zloy xaker [14]

12.000 g of 12c is one

5 0

2 years ago

Read 2 more answers

If you want to make 8.00 moles of AlF₃ how many moles of F₂ will you need, using the following balanced chemical equation? 2 Al

Zinaida [17]

Answer:

You will need 12 moles of F2 if you want to make 8 moles of AlF3.

Explanation:

It takes 3 moles F2 to make 2 moles of AlF3 (this will be our mole ratio)

2 moles AlF3/3 moles F2 =8 moles AlF3/x moles AlF3.

x=12 moles AlF3

7 0

2 years ago

Match the name of each gas law to the properties it compares. 1. Gay-Lussac's law 2. Boyle's law 3. Avogadro's law a. Volume and

oee [108]

Answer:

1. C 2. B 3. A

Explanation:

1. Gay- Lussac law, states that as along as the volume is kept constant, the pressure of a fixed mass of gas is directly proportional to the temperature.

The properties it compares is; (c.) Pressure and temperature

2. Boyle's Law states that; as long as the temperature is kept constant, the volume of a fixed mass of gas is inversely proportional to the pressure.

It therefore compares; (b.) Pressure and volume

3. Avogadro's Law states that equal volumes of different gases contain the same number of molecules provided the temperature and pressure are the same.

It therefore compares; (a.) Volume and moles

6 0

2 years ago