7th Grade Science Benchmark - Bequette

Scientists calculate measurements of various objects on Earth and in space. Which of the following measurements depend on the amount of gravitational pull on an object?

• Weight

• Volume

• Density

• Mass

While Karen was cooking dinner, she noticed that several ingredients went through chemical and physical changes. Which cooking process is an example of a physical change?

• boiling soup

• frying eggs

• baking cookies

• toasting bread

When matter changes from a solid to liquid or from liquid to gas, what kind of change takes place?

• chemical change

• physical change

• thermal change

• energy change

Tags

NGSS.MS-PS1-4

Darius tears pages of newspaper into pieces to start a campfire. What kind of change is taking place as the paper is torn?

• a change in physical property

• a change in chemical property

• a change in substance

• a change in matter

Scientists use measurements of air temperature to predict how air masses will behave. On a warm day, if a very cold air mass suddenly rushed in, what could scientists predict about what would happen to the air mass and the resulting change in energy?

• The cold air would cause the warm air to rise as density decreases. Thermal energy would remain the same.

• The cold air would cause the warm air to sink as density decreases. Thermal energy would remain the same.

• The cold air would cause the warm air to sink as density increases. Thermal energy would be released by the warm air and temperatures would decrease.

Tags

NGSS.MS-ESS2-5

Adam is helping his uncle in his restaurant, where he notices many examples of physical and chemical changes. Which one of the following describes both a physical and chemical change?

• Raisins, almonds, and pumpkin seeds are mixed together. The mixture is then distributed among five containers.

• Butter is softened and mixed into a cookie recipe. Then, it is placed in the refrigerator to cool.

• Sugar cubes are crushed, then put into a pan to cook. The sugar begins to melt and then burns.

Tags

NGSS.MS-PS1-2

When a substance has large or strongly-attracted particles, they do not flow freely. For example, water flows very quickly compared to honey. Which property of liquids does this example illustrate?

• amorphousness

• surface tension

• viscosity

Anita conducts an experiment to see how the volume of a gas-filled balloon changes when the temperature increases or decreases over time. Which of the following statements explains the relationship between temperature and volume of a gas?

• When temperature increases, the volume increases.

• When temperature is increases, the volume decreases.

• They are both dependent variables.

Tags

NGSS.MS-PS3-4

After using an air mattress, Lucy opens the valve to deflate it and air begins rushing out of the mattress. When will the air most likely stop rushing out of the mattress?

• When the air pressure in the mattress is LESS than atmospheric pressure.

• When the air pressure in the mattress is EQUAL to atmospheric pressure.

• When the air pressure in the mattress is MORE than atmospheric pressure.

Different types of solids behave differently due to their crystalline structure. Which statement best describes plastic?

• Plastic is an amorphous solid, because it can be gradually heated and cooled to take on a specific shape.

• Plastic is an amorphous liquid, because it does not melt at a specific temperature.

Tags

NGSS.MS-PS3-3