Review

Adding baking soda to vinegar results in a chemical reaction. If the temperature of the vinegar is increased what will happen to the rate of the reaction?

• The rate of reaction will slow down as particle motion slows down

• The rate of the reaction will be unchanged, temperature has no effect on chemical reactions

• The rate of the reaction will speed up as you increase particle motion

• The reaction will not occur, temperature inhibits chemical reactions

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which statement correctly describes how a chemical change is different from a physical change?

• A chemical change always involves two liquids, physical always solids

• Only a chemical change requires the input of energy, physical does not require energy

• A chemical change always involves mixing elements, physical mixes compounds

• Only a chemical change produces a new substance, physical change only changes form

Tags

NGSS.MS-PS1-5

Which of the following describes the energy transformation that occurs when a lamp is plugged in and turned on?

• Mechanical energy is converted to electrical and chemical energy

• Chemical energy is converted to thermal and mechanical energy

• Electrical energy is converted to light and thermal energy.

• Electromagnetic energy is converted to kinetic energy.

Which of the following is a major difference between plant and animals cells?

• Animal cells have a cell wall, plant cells do not

• Only animal cells have mitochondria, plant cells do not

• Animal cells have a cell membrane and plant cells do not.

• Plant cells have cell walls, animal cells do not.

An astronaut leaves Earth’s surface and begins orbiting Earth. How will his mass and weight change?

• His mass and weight will stay the same

• His weight increases and mass decreases

• His mass stays the same and weight increases

• Hs mass stays the same and weight decreases

What happens to the materials that make up paper as it is burned?

• The materials are unchanged

• The mass of the materials that make up the paper are conserved as they transform to other types of materials.

• The materials that make up the paper are lost and disappear.

• The mass of the materials that make up the paper are increased as they change forms

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

You put away a clean fork. Later you take it out and it is tarnished. Which statement best describes what happened?

• Tarnish particles drifted through the air and settled on the fork

• Dust stuck to the fork and changed into tarnish

• Elements in the air and the fork combined to form tarnish

• The fork started to decay

Tags

NGSS.MS-PS1-2

A balloon filled with air does not rise as high as a balloon filled with helium. What does this tell you about the density of helium.

• Helium is less dense than air

• Helium is more dense than air

• The two gases have the same density

• When heated, helium becomes more dense

The Sun is the source of energy for producers. However, only about 10% of the energy is transferred from producers to consumers. What most likely happens to the other 90% of the producers’ energy?

• Some of it is released as light energy, and some of it is stored as chemical energy.

• Some of it is destroyed, and some of it is stored as light energy.

• Some of it is destroyed, and some of it is stored as chemical energy.

• Some of it is released as heat energy, and some of it is stored as chemical energy.

Tags

NGSS.MS-LS2-3

Paula pushes a skateboard and it gradually slows down to a stop. Why does the skateboard come to a stop?

• Friction and gravity slow the skateboard.

• Gravity alone stops the skateboard.

• The skateboard has positive acceleration.

• Paula did not push the skateboard with enough force.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4