CHEMICALS & CHEMICAL SUBSTANCES

symbol of sodium

• k

• Fe

• Na

• Ag

A copper penny turning greenish after a few years is an example of ...

• Chemical Change
• Physical Change

An explosion occurs ...

• Chemical Change
• Physical Change

Is digesting your food a physical or chemical change?

• Physical
• Chemical

Is a car using fuel a physical or chemical change?

• Physical
• Chemical

The diagram below shows changes happening to water in a specially shaped bottle.
What changes did the water undergo?

• melting and then freezing
• freezing and then evaporation
• condensation and then melting
• evaporation and then condensation

Identify what type of change happening in the picture below...

• Chemical Reaction

• Physical Change

• Change in State

• Change in appearance only

Which of the following is a molecule?

• copper

• ferrum

• oxygen we inhale

• none of these

The atomicity of water is

(a)  

Which of the following is correct representation of carbon monoxide?

• Co

• cO

• none of these

• CO