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2 years ago

Consider the entropy change in the following chemical or physical processes:

Chemistry

1 answer:

Likurg_2 [28]2 years ago

3 0

Answer:

Explanation:

Recall that entropy measures the number of microstates in a substance, which is highest in gases, followed by liquids and solids. Hence, entropy increases if the products have more gaseous molecules than the reactants.

In reaction one, chlorine gas is converted into solid NaCl, so entropy decreaes.

In reaction two, four moles of gas are converted into two moles of gas, so entropy decreases.

In reaction three, ice is melted to form water, which has higher entropy. Thus, entropy increases.

In reaction four, a liquid is freezed into its solid phase, leading to a decrease in entropy.

In reaction five, oxygen gas is converted into solid MgO, so entropy decreases.

In conclusion, the answer is D.

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If the only chemical you can find is labeled with the wrong concentration:_______

Softa [21]

Answer:inform the lab instructor and get instructions

Explanation:

If you come across a chemical in the laboratory which has been wrongly labelled, do not be quick to dilute it or take any further action. The laboratory instructor who may have prepared the reagent himself or has better knowledge about the reagent should be contacted immediately so that he/she can give you instructions about what to do with the wrongly labelled reagent.

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3 years ago

What may be the most important tool to use for collecting data when conducting an investigation into how thermal energy affects

Anna11 [10]

Answer:

thermometer

Explanation:

The most important tool to use when collecting data relating to how thermal energy affects metals would be the thermometer.

The thermometer is an instrument used to measure temperatures and the temperature of a body is a measure of the amount of thermal energy present in the body.

In order to obtain data relating to how thermal energy affects metals, the most important variable to take note of would be the thermal energy of the metals and this can only be done by the thermometer.

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3 years ago

An atom has 13 protons and 14 neutrons. What is its mass number?

Hitman42 [59]

Protons have a mass of 1
Neutrons have a mass of 1

So 13*1 + 14*1 = Mass number 27

3 0

3 years ago

Read 2 more answers

The table describes how some substances were formed.

lisabon 2012 [21]

Explanation:

Which is a pure substance?

1. soda

2. gasoline

3. salt water

4. carbon dioxide

carbon dioxide

Bromine, a liquid at room temperature, has a boiling point of 58°C and a melting point of -7.2°C. Bromine can be classified as a

1. compound.

2. impure substance.

3. mixture.

4. pure substance.

pure substance.

6 0

4 years ago

Read 2 more answers

Which statement applies to electronegativity?

densk [106]

Answer: The correct answer is Option A.

Explanation:

Electronegativity is defined as the tendency of an atom to attract the shared pair of electrons towards itself whenever a bond is formed.

This property increases as we move from left to right across a period because the number of charge on the nucleus gets increased and electrons are attracted more towards the nucleus.

This property decreases as we move from top to bottom in a group because the electrons get add up in the new shells which make them further away from the nucleus.

Thus, the correct answer is Option A.

7 0

3 years ago