6th Grade Science Review

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

• Chemicals are used

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

• Molecules do not physically touch

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

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

One clue of a chemical change is the formation of a precipitate. A precipitate is formed when...

• Two liquids react and a gas is produced

• A solid dissolves in a liquid

• One liquid dissolves in another

• Two liquids react and a solid is formed

Tags

NGSS.MS-PS1-2

Some chemical reactions require a substance called a catalyst. The main purpose of a catalyst is...

• To warm up the reaction

• To speed up the reaction

• To create more reactants

• To stop the reaction

Tags

NGSS.HS-PS1-5

An element and an atom are different but related because...

• A particular element is made up of many different types of atoms

• A molecule is the same as an atom

• An element is made up of all the same type of atom

• An element is smaller than an atom

Tags

NGSS.MS-PS1-1

The density of an object is...

• The mass divided by the volume D = m/v

• The volume divided by the mass D = v/m

• The same as its weight

• The same as the size of the object

If two objects have the same volume but one has a greater mass, the one with greater mass...

• Has a lower density

• Has a higher density

• Will float

• Will sink

If you cut a wooden block in half, each half would have...

• Half the density of the original piece

• Twice the density of the original piece

• The same density as the original piece

• No density at all

Density is a characteristic property of a substance. This means that the density of water

• Stays the same regardless of the volume

• Changes depending on the volume

• Is greater for a greater amount of water

• Is less for a smaller amount of water

An object will float in a liquid if it is...

• More dense than the liquid

• Less dense than the liquid

• Lighter than metal

• Shaped like a ball

A tiny piece of sand is very light but sinks in water. This is because...

• Sand is a solid

• Sand is less dense than water

• There is more water than sand

• Sand is more dense than water