Physical vs Chemical Changes
Which is a physical change?
A. Burning wood
B. Rusting iron
C. Melting ice
D. Baking cookies
C. Melting ice
What is an energy transformation?
A. Destroying energy
B. Creating new matter
C. Changing energy from one form to another
D. Freezing energy
C. Changing energy from one form to another
What is an element?
A. A mix of substances
B. A pure substance made of one type of atom
C. Two substances combined
D. A liquid only
B. A pure substance made of one type of atom
Which layer of Earth is the thickest?
A. Crust
B. Mantle
C. Outer core
D. Inner core
B. Mantle
What is net force?
A. The strongest force only
B. The total force acting on an object
C. A force that disappears
D. The weight of an object
B. The total force acting on an object
What happens during a physical change?
A. A new substance is made
B. Matter disappears
C. The substance stays the same
D. Atoms are destroyed
C. The substance stays the same
What type of energy transformation happens in a flashlight?
Chemical ---> Light
A compound is made when —
A. Different atoms chemically combine
B. Substances are mixed but not bonded
C. Water freezes
D. Matter disappears
A. Different atoms chemically combine
What is the inner core mostly made of?
A. Water and rock
B. Gas and ice
C. Iron and nickel
D. Sand and magma
C. Iron and nickel
If two people push a box in the same direction with 5 N each, what is the net force?
A. 0 N
B. 5 N
C. 10 N
D. 15 N
C. 10 N
Which is a sign of a chemical change?
A. Change in state
B. Change in color
C. Cutting into pieces
D. Breaking glass
B. Change in color
When you eat food and run, what energy transformation occurs?
Chemical ----> Mechanical
Which is a compound?
A. Gold
B. Helium
C. Carbon
D. Rust
D. Rust
At which boundary do plates slide past each other?
A. Convergent
B. Divergent
C. Transform
D. Continental
C. Transform
Balanced forces cause an object to —
A. Speed up
B. Stop existing
C. Stay still or move steadily
D. Explode
C. Stay still or move steadily
What is often produced during a chemical reaction?
A. A new substance
B. Only smaller pieces
C. Only liquid water
D. Nothing changes
A. A new substance
What kind of energy does the Sun mainly provide to Earth?
Light and thermal
What is a mixture?
A. A pure substance
B. Two or more substances combined without chemical bonding
C. One type of atom only
D. A chemical reaction
B. Two or more substances combined without chemical bonding
What often forms at divergent boundaries?
A. Mountains
B. Mid-ocean ridges
C. Deep earthquakes only
D. Tornadoes
B. Mid-ocean ridges
If one person pushes with 8 N right and another pushes with 3 N left, what is the net force?
A. 11 N right
B. 5 N right
C. 5 N left
D. 0 N
B. 5 N right
Which process is a chemical change?
A. Crushing a can
B. Freezing water
C. Boiling water
D. Baking a cake
D. Baking a cake
T or F: Energy disappears after it is used.
FALSE
On the periodic table, what do group numbers tell us?
What collum the element is in
What forms when an oceanic plate sinks under a continental plate?
A. Sand dunes
B. Volcanoes
C. Icebergs
D. Rivers
B. Volcanoes
Which formula is used to calculate density? A. Mass × volume
B. Mass ÷ volume
C. Volume ÷ mass
D. Force × mass
B. Mass ÷ volume