Matters and Properties of Matters Exam1 and Problem Solutions
1. Which ones of the following statements are chemical property of CO2 gas?
I. It is not combustive matter
II. It is heavier than air
III. It dissolves better in water
I. Being combustive element or not shows whether CO2 reacts with O2 or not, so I is a chemical property of CO2.
II. Being heavier than air is a physical property of CO2. We can understand that density of CO2 is larger than density of air.
III. Solubility in water is a physical property of CO2.
2. Which ones of the following properties of pure liquid do not change with amount of matter?
I. Boiling point
II. Melting Point
Boiling point and melting point do not depend on amount of matter and they are distinguishing properties of matter.
Volume depends on amount of matter. When amount of matter increases, then volume of it also increases.
Density s distinguishing property of matter and does not depend on amount of matter.
3. Find given matters are homogeneous or heterogeneous mixtures.
III. Salt water mixture
IV. Gas mixtures
V. Ice water mixture
VI. Naphthalene water mixture
I, III and IV are homogeneous matters and;
II, V and VI are heterogeneous matters.
4. Which ones of the following statements related t classifications of matters are false?
I. Elements come together in definite proportions and form compounds
II. All mixtures are homogeneous matter
III. All elements are pure matter
Elements come together in definite proportions and produce compounds I is true. All mixtures are not homogeneous matter, they can also be heterogeneous like milk, II is false. All elements are pure matters, III is true.
5. X, Y and Z matters are in room temperature and includes different types of atoms. When we give heat to Z, it decompose to X and Y matters. During melting process, temperatures of X and Y stay constant but temperature of Z changes. Which ones of the following statements are false for this situation?
I. Z is a pure compound formed by two different matters.
II. X and Y are pure matters
III. Z is formed by X and Y matters.
Since temperatures of X and Y stay constant, they are pure substances and Z is not pure substance. X and Y includes different types of atoms, so they are compounds and Z is mixture.
6. Which one of the followings is not distinguishing property of liquids.
II. Freezing point
III. Refractive index
IV. Coefficient of linear expansion
Coefficient of linear expansion is distinguishing property of matters having specific geometric shapes. It is change in the length of matter when its temperature is changed 1 0C. Since liquids do not have specific shapes we can not talk about linear expansion of them. All others are distinguishing property for liquids.
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