Chemistry Practice Quiz: Flashcards 9/13

Questions and Answers

In which pair are the members classified as substances?

Mixtures and solutions

Elements and mixtures

Compounds and elements (correct)

Compounds and solutions

Which can not be decomposed by a chemical change?

A heterogeneous mixture

A homogeneous mixture

A compound

An element (correct)

An example of a heterogeneous mixture is?

Table salt

A sugar solution

An ice cream soda (correct)

Carbon dioxide

Which statement describes a characteristic of all compounds?

Compounds can be decomposed by chemical means Signup and view all the answers

Which is a characteristic of all mixtures?

Their composition is generally can be varied Signup and view all the answers

Which is the equivalent of 750 joules?

0.750 kJ Signup and view all the answers

Which temperature originally represented the fixed points on the Celsius temperature scale?

0⁰ and 100⁰ Signup and view all the answers

Expressed in proper scientific notation, the number is 0.00213.

2.13 x 10⁻³ Signup and view all the answers

When the number 1.2 x 10² and 3.4 x 10¹ are added, the result expressed in proper scientific notation is

1.5 x 10² Signup and view all the answers

When the numbers 4.2 x 10² and 8.4 x 10¹ are multiplied, the exponent of the result, expressed in proper scientific notation is

4 Signup and view all the answers

As the temperature of a gas is increased, the average kinetic energy of its molecules

Increases Signup and view all the answers

Which of the following is an example of a physical change?

Concentrated hydrochloric acid is diluted with water Signup and view all the answers

Which would be considered a chemical change?

Decomposition of water to H₂(g) and O₂(g) Signup and view all the answers

Ductility and malleability are examples of?

Physical properties Signup and view all the answers

What process is used to separate a mixture of liquids based on a difference in boiling point?

Distillation Signup and view all the answers

What Kelvin temperature is equal to -33°C?

240 K Signup and view all the answers

Which substance can NOT be decomposed by a chemical change?

Carbon (C) Signup and view all the answers

An example of a mixture is?

Salt water Signup and view all the answers

Matter is defined as anything that occupies space and has?

Mass Signup and view all the answers

Element A and element B become chemically bonded together to form substance C. Substance C must be?

A compound Signup and view all the answers

A true solution is best described as a?

Homogeneous mixture Signup and view all the answers

Which of the following is not a diatomic gas?

Neon Signup and view all the answers

Which of the following statements is an identifying characteristic of a mixture?

A mixture can be separated by physical means Signup and view all the answers

Which pair is classified as a substance?

Elements and compounds Signup and view all the answers

A solid is dissolved in a beaker of water. Which observation suggests that the process is endothermic?

The temperature of the solution decreases Signup and view all the answers

The temperature 30 K expressed in degrees Celsius is?

-243 °C Signup and view all the answers

Which of the following statements describes a chemical property of the element iodine?

It reacts with hydrogen to form a gas Signup and view all the answers

Which set of properties does a substance such as CO₂(g) have?

No definite shape but definite volume Signup and view all the answers

Study Notes

Classification of Substances

Compounds and elements are classified as substances.
Elements cannot be decomposed by chemical change.
An example of a heterogeneous mixture is ice cream soda.

Characteristics of Compounds and Mixtures

All compounds can be decomposed by chemical means.
Mixtures have variable compositions; they are not fixed.

Scientific Notation and Temperature

750 joules is equivalent to 0.750 kJ.
Fixed points on the Celsius scale are 0°C (freezing point) and 100°C (boiling point).
Proper scientific notation for 0.00213 is 2.13 x 10⁻³.

Calculations using Scientific Notation

Adding 1.2 x 10² and 3.4 x 10¹ gives 1.5 x 10².
Multiplying 4.2 x 10² and 8.4 x 10¹ results in an exponent of 4.

Properties of Gases and Changes

Increasing the temperature of a gas leads to an increase in average kinetic energy.
Diluting concentrated hydrochloric acid with water is a physical change.
The decomposition of water into hydrogen and oxygen is a chemical change.

Physical and Chemical Properties

Ductility and malleability are examples of physical properties.
Distillation is used to separate liquid mixtures based on boiling points.

Temperature Conversions

-33°C is equivalent to 240 K in Kelvin temperature.

Mixtures and Matter

Carbon (C) cannot be decomposed by chemical means.
Salt water is an example of a mixture.
Matter is defined as anything that occupies space and has mass.

Chemical Bonds and Solutions

When two elements chemically bond to form a new substance, the result is a compound.
A true solution is characterized as a homogeneous mixture.

Diatomic Gases and Mixture Characteristics

Neon is not a diatomic gas; nitrogen, hydrogen, and chlorine are diatomic.
Mixtures can be separated by physical means and may consist of a single element.

Observations in Chemical Processes

An endothermic process is indicated by a decrease in temperature of the solution.
30 K converted to degrees Celsius is -243°C.

Chemical Properties and States of Matter

Iodine's chemical property includes its reaction with hydrogen to form a gas.
Carbon dioxide (CO₂) has no definite shape and no definite volume when in gaseous form.

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Description

Test your knowledge of chemistry with these flashcards that cover key concepts of substances, mixtures, and compounds. This quiz focuses on identifying different classifications in chemistry. Perfect for students looking to reinforce their understanding of the subject.