Chemistry Revision 1

As particles are exposed to warmer temperatures they __________

• speed up
• slow down
• stay the same
• vibrate

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is the change of state from a solid straight to a gas called?

• melting
• evaporating
• freezing
• sublimation

A mixture of metals is called an ______ .

What other laboratory substance can you use to test if colourless substance is an acid or an alkali?

• Catalyst

• Salt

• Universal Indicator

• Water

What do we call the center of the Earth?

• Mantle

• Crust

• Lithosphere

• Core

The remains of an organism studied by scientists is called a ____________.

• paleontologist

• fossil

• dinosaur

• shark

Which of the substances below is a compound?

• ink
• air
• oxygen
• salt

Tags

NGSS.MS-PS1-1

A chemical change is different than a physical change because in a chemical change

• chemicals are used

• molecules do not physically touch

• a new substance is formed and in a physical no new substance is formed

• the change can be seen but in a physical change it cannot

Tags

NGSS.MS-PS1-2

What is a subatomic particle with a positive charge that is in the nucleus of an atom?

• neutron

• proton

• electron

• valence electron

In Group 1 elements, as you go down the group melting point and boiling point _____. In Group 7 elements, as you go down the group melting point and boiling point _____. In every period of the periodic table, melting point increases from left to right for the first four elements. True/False

• decreases, decreases, false

• decreases, increases, true

• increase, increase, false

• decreases, decreases, true