Elements and compounds
What is a mixture
does physical or chemical changes create new substances?
Chemical
Does color alone determine what mineral it is?
no
Potential energy is?
A. The energy an object has due to its atomic structure.
B. The energy an object has due to its chemical composition.
C. The energy an object has due to its motion.
D. The energy an object has due to its position or condition.
D. The energy an object has due ti its position or condition
Why are coal, oil, and natural gas classified as nonrenewable resources?
A. They are limitless
B. They exist in many places on Earth.
C. They are originally from once-living things.
D. They take millions of years to form.
D. They take millions of years to form.
which is an example of a mixture
A. water
B. salt
C. A salad
A salad
What are the four things that can be present for a physical change?
size
shape
state of matter
color
What is the name of what determines hardness and what what is the toughest mineral
Diamond
Mohs scale
When does an object have no kinetic energy?
A. When it's at rest.
B. When it's moving very slowly.
C. When the only force that's acting on it is gravity.
D. When it has no electrical charge.
A. When it's at rest
When you rub your hands together, this is an example of ________ energy.
A. Sound
B. Light
C. Thermal
D. Mechanical
C. Thermal
What is the smallest part of an element and the smallest part of a compound?
molecule
What can be present for a chemical change?
Unexpected color change
precipitate
bubbles and gas
sound and smell
temperature change
Juan bought three minerals, quartz, topaz, and calcite. He started to test each minerals hardness. He grabbed calcite and tried scratching quartz but was unable to. He then grabbed topaz and scratched quartz. He also used topaz to scratch calcite. What does this tell you
Topaz is the hardest
then quartz
finally calcite
When does a yo-yo have the most potential energy?
A. When it's at its highest point.
B. When it's at its lowest point.
C. When it's moving between its highest and lowest points.
D. When it's moving at its top speed.
A. when it is at its highest point
Hydroelectric power is electricity that is generated using the power of falling water. Which of the following is a disadvantage of the use of hydroelectric power?
A. Falling water is unable to generate enough electricity to make it a good option
B. It requires the construction of a dam which can harm the natural environment
C. It uses up the water from a river
D. It pollutes the source of water
B. It requires the construction of a dam which can harm the natural environment
What is an element?
A. Pure substance that cannot be broken down into anything simpler
B. Not a Pure substance that cannot be broken down into anything simpler.
C. A. Pure substance that can be broken down into something simpler
A. Pure substance that cannot be broken down into anything simpler
Which of the following is a chemical change
A. salt water
B. a salad
C. watching a cake bake
D. fireworks exploding
D.
Describe how you would determine a mineral’s streak.
A. Rub the mineral on a ceramic plate.
B. Rub the mineral on a glass plate.
C. Break the mineral.
D. Place the mineral in a beaker of water.
A. Rub the mineral on a ceramic plate.
When does a yo-yo have the most potential energy?
A. When it's at its highest point.
B. When it's at its lowest point.
C. When it's moving between its highest and lowest points.
D. When it's moving at its top speed.
A. When its at its highest point
The Law of Conservation of Energy states that..
A. energy can be created
B. Energy cannot be created nor destroyed and cannot transform from one form to another
C. Energy cannot be created or destroyed but i can change from one form to another
D. Energy will never be created but it can be destroyed
C. Energy cannot be created or destroyed but i can change from one form to another
What is a compound?
A. pure substance of 2 or more substances that chemically combine.
B. pure substance of 2 or more elements that chemically combine.
C. pure substance of 2 or more elements that physically combine.
D. pure substance of 2 or more substances that physically combine.
B. A pure substance of 2 or more elements that chemically combine.
What is a precipitate
two liquids combine to form a solid
Rubbing a mineral on a glass plate is testing which property?
A. Streak
B. Hardness
C. Density
D. Breakage
B. Hardness
Why do objects at high elevations have more potential energy than objects at low elevations?
A. Because the thinner air at higher elevations means objects have a greater potential to move very fast
B. Because objects at high elevations are closer to the sun, which is the source of all energy on earth
C. Because objects at high elevations tend to move slower than objects at low elevations
D. Because gravity gives objects at high elevations the potential to fall much further
D. Because gravity gives objects at high elevations the potential to fall much further
A student who is feeling cold rubs her hands on her bare arms. What energy transformation is the student using to feel warmer?
A. mechanical to thermal
B. light to thermal
C. Thermal to chemical
D. electrical to thermal
A. Mechanical to thermal