CHEMISTRY HIGH SCHOOL

Which of the following items represents a chemical change? burning melting evaporation freezing The physical properties of a compound are similar to those of its elements.
a. True
b. False

Answers

Answer 1
Answer:

1. Which of the following items represents a chemical change? burning melting evaporation freezing

Answer:

  • Chemeical change: Burning
  • Physical change: melting evaporation freezing

Explanation:

Chemical properties depend on composition while physical properties do not depend on composition. As in case of burning, composition changes due to this , this is chemical properties while freezing, melting and evaporating process, composition remain same, so these have physical properties, like water in liquid, ice and vapor state have same composition.


2. The physical properties of a compound are similar to those of its elements.  

Answer:

  • False

Explanation:

  • The properties of compounds are often very different from the properties of the elements that make them. For example, water is made from two atoms of hydrogen bonded to one atom of oxygen. H2O have different physical properties than oxygen and hydrogen.
Answer 2
Answer:

Final answer:

In the context of Chemistry, 'Burning' is a chemical change as it results in new substances. The claim that a compound's physical properties are similar to its elements is typically false as the properties often differ significantly, an example being the difference between water and its constituent elements hydrogen and oxygen.

Explanation:

The question falls under the field of Chemistry. It refers to the concept of chemical and physical changes in matter. A chemical change is a change in matter that results in the formation of one or more new substances with new properties. On the contrary, a physical change relates to a change in the state of matter without any change in its chemical composition. Out of the options given, the process of 'Burning' symbolizes a chemical change as it results in the formation of new substances such as carbon dioxide, water vapor, etc.

As for the second part of your question, the statement that 'physical properties of a compound are similar to those of its elements' is generally false. The properties of a compound often differ greatly from those of the constituent elements. One classic example is that of water (H2O). Water is a liquid at room temperature, quenches thirst, and is essential for life. However, its constituent elements - Hydrogen and Oxygen - are both gases and do not possess these characteristics.

Learn more about Chemical Changes here:

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What will happen to the volume if the amount of a gas is decreased at constant temperature and pressure?

Answers

To predict the changes, we first that this gas is ideal. An ideal gas i when the molecules of the gas occupy a negligible volume and have no interactions with one another. The conditions of this gas can be calculated by the use of the Ideal Gas equation which is expressed as: PV=nRT. If this gas is at a constant temperature and pressure and the amount is decreased then the volume will most likely decrease as well.

Which of the following is NOT a common property of bases?a. feels slippery
b. tastes bitter
c. reacts with metals
d. changes colors of indicators

Answers

Bases are a class of compounds composed mainly of metal oxides and metal hydroxides. Bases exhibit the following properties:
Slippery feeling because they react with oils on the skin's surface to form soap.
Bitter taste
Changes color of indicators

However, bases do not react with metals. Therefore, the answer is C.

The oxidizing agent in 2H2S + 3O2 → 2SO2 + 2H2O is

Answers

Hello, Ginamuhs2!

The oxidizing agent in 2H2S + 3O2 → 2SO2 + 2H2O is the oxygen.

I hope this helps;)

eleanor wants to show her class a comparison of melting rates between two different solids when he is applied why would a graph be more suitable than a table to show her data

Answers

Eleanor wants to show her class a comparison of melting rates between two different solids when heat is applied. A graph would be more suitable than a table to show her data because the she can see the trend line of the effects of melting than the table.

Which describes the relationship between [H+] and [OH−] ?

Answers

There are quite a fewrelationships between [H+] and [OH−]ions. And because there is a large range of number between 10 to 10-15M, the pH is used. pH = -log[H+] and pOH = -log[OH−]. In aqueous solutions, [H+][OH- ] = 10-14. From here we can derive the values of each concentration.  

-log[H+ ] + -log[OH- ] = -log[10-14]
pH + pOH = 14
So pH = 14 – pOH and pOH = 14 –pH 

A neutral solution occurs when pH= pOH = 7. It is an acid solution when [H+ ] > [OH- ],  pH < 7 and basic when [H+ ] < [OH- ], pH> 7.
H+ is for an acid, which has a pH of 1-7. OH- is for a base, called hydroxide, and has a pH of 7-14. 

pH 7 is neutral. 

Rank cesium, chlorine, and chromium in order of increasing electron affinityA) Cs < Cr < Cl
B) Cl < Cr < Ce
C) Ce < Cl < Co
D) Ca < Cu < Cl

Answers

The correct answer is A. Cesium has the lowest electron affinity among the three while Chlorine has the highest. 
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