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Questions and Answers
In which pair are the members classified as substances?
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?
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?
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?
Which statement describes a characteristic of all compounds?
Which is a characteristic of all mixtures?
Which is a characteristic of all mixtures?
Which is the equivalent of 750 joules?
Which is the equivalent of 750 joules?
Which temperature originally represented the fixed points on the Celsius temperature scale?
Which temperature originally represented the fixed points on the Celsius temperature scale?
Expressed in proper scientific notation, the number is 0.00213.
Expressed in proper scientific notation, the number is 0.00213.
When the number 1.2 x 10² and 3.4 x 10¹ are added, the result expressed in proper scientific notation is
When the number 1.2 x 10² and 3.4 x 10¹ are added, the result expressed in proper scientific notation is
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
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
As the temperature of a gas is increased, the average kinetic energy of its molecules
As the temperature of a gas is increased, the average kinetic energy of its molecules
Which of the following is an example of a physical change?
Which of the following is an example of a physical change?
Which would be considered a chemical change?
Which would be considered a chemical change?
Ductility and malleability are examples of?
Ductility and malleability are examples of?
What process is used to separate a mixture of liquids based on a difference in boiling point?
What process is used to separate a mixture of liquids based on a difference in boiling point?
What Kelvin temperature is equal to -33°C?
What Kelvin temperature is equal to -33°C?
Which substance can NOT be decomposed by a chemical change?
Which substance can NOT be decomposed by a chemical change?
An example of a mixture is?
An example of a mixture is?
Matter is defined as anything that occupies space and has?
Matter is defined as anything that occupies space and has?
Element A and element B become chemically bonded together to form substance C. Substance C must be?
Element A and element B become chemically bonded together to form substance C. Substance C must be?
A true solution is best described as a?
A true solution is best described as a?
Which of the following is not a diatomic gas?
Which of the following is not a diatomic gas?
Which of the following statements is an identifying characteristic of a mixture?
Which of the following statements is an identifying characteristic of a mixture?
Which pair is classified as a substance?
Which pair is classified as a substance?
A solid is dissolved in a beaker of water. Which observation suggests that the process is endothermic?
A solid is dissolved in a beaker of water. Which observation suggests that the process is endothermic?
The temperature 30 K expressed in degrees Celsius is?
The temperature 30 K expressed in degrees Celsius is?
Which of the following statements describes a chemical property of the element iodine?
Which of the following statements describes a chemical property of the element iodine?
Which set of properties does a substance such as CO₂(g) have?
Which set of properties does a substance such as CO₂(g) have?
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.
Studying That Suits You
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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.
