2024 Science Review #1

Which statement best describes the mass of matter in an open system?

• Mass increases in an open system.

• Mass may decrease in an open system.

• Mass remains the same in an open system.

• Mass increases, then decreases in an open system.

The diagram shows the same amount (100 mL) of the same liquid in three differently shaped containers. What can we determine about liquids from this?

• Liquids have no definite volume and no definite shape.

• Liquids have no definite volume but definite shape.

• Liquids have a definite volume and definite shape.

• Liquids have a definite volume but no definite shape.

In a chemical reaction, mass is conserved. The Law of Conservation of Mass states ---.

• the molecules of the reactants do not change during a chemical reaction

• the mass of the products is more than the mass of the reactants during a chemical reaction

• the type and number of atoms in the reactants equals the type and number of atoms in the products

• the mass of the products is always twice the mass of the reactants

Look at the drawings and think about the arrangement of oil molecules compared to water molecules. Which statement is correct?

• Oil is more dense than water.

• Water is more dense than oil.

• Oil and water will easily mix together.

• Water will float on oil.

Which of the following is evidence that a chemical reaction has occurred?

• Change in shape

• Change in temperature

• Change in texture

• Change in state of matter

Which of the following actions will cause the molecules in matter to speed up?

• Add heat to the matter

• Cool the matter

• Let the matter rest

• Molecules of matter remain unchanged in varying environments

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

• putting lemonade into the freezer

• baking cookies

• cutting up brownies

• melting chocolate

Which of the following is not a physical property of matter?

• color

• density

• flammability

• melting point

Sonar is a system boats use to help navigate and locate objects beneath the surface of the water. It is most closely related to which other sound phenomena?

• The Doppler Effect

• Echolocation

• Vibration

• Electromagnetic resonance

How does echolocation work?

• Animals give off electromagnetic radiation that gives signals that receptors receive.

• Animals emit light energy that gets reflected off objects they cannot see.

• Animals send out sound waves that bounce off objects in their environment that help them find food, navigate their surroundings, and avoid predators.

• Animals do not use echolocation.