Milestones Science

Which statement about molecules in ice and the molecules in water is?

• The molecules in ice have more energy than the molecules in liquid water
• The molecules in ice contain different atoms than the molecules in liquid water
• The molecules in ice have more electric charge than the molecules in liquid water
• The molecules in ice are less free to move than the molecules in liquid water

Which of the following is a compound?

• Oxygen 
• Water
• Nitrogen
• Air

Which symbol represents carbon?

• Ca
• N
• K
• C

Evidence of a chemical change would be a

• melting popsicle
• spinning top
• spilled bucket of water
• rusting car fender

Moisture that collects on the outside of a cold glass results from the process of

• evaporation
• condensation
• sublimation
• vaporization

A hot air balloon rises because

• molecules become lighter when heated
• molecules move faster and farther apart when heated
• molecules are less attracted by gravity when heated
• molecules become charged and repel each other when heated

The solid, liquid, and gaseous states of water differ from each other in

• the mass of the individual atoms 
• the size of he individual atoms
• the net electrical charge of the individual molecules
• the average speed of movement of the individual molecules

The solid, liquid, and gaseous states of water differ from each other in

• the mass of the individual atoms 
• the size of he individual atoms
• the net electrical charge of the individual molecules
• the average speed of movement of the individual molecules

Compare and contrast mixtures and compounds. Which statement is true about mixtures and compounds?

• Both mixtures and compounds are the same throughout
• Mixtures and compounds are made of two or more elements in a definite proportion
• mixtures must be separated by chemical methods and compounds by physical methods
• mixtures contain two or more elements physically combined and compounds contain two or more elements chemically combined

Which symbolizes a molecule of a compound?

• He
• Be
• N2
• NaCi