Chemistry chapter 2

Which one of this techniques helps scientists to solve problems?

• Use every data even though it is not related.

• Don't analize, just solve by instinct.

• Identify the known facts.

• Get a quickly solution.

What is SI fundamental unit of mass?

• meter (m)

• kilogram (kg)

• second (s)

• pounds (lb)

List the number of significant digits og the following exercise:    5.029

• 1 significant digit

• 2  significant digit

• 3 significant digit

• 4 significant digit

What is the formula for density?

• density = mass x volume

• density = mass / volume

• density = mass + volume

• density = mass - volume

Frank has an eraser. It has a mass of 4g, and a volume of 2cm³. What is its density?

• 8 g/cm³

• 2 g/cm³

• 2 kg/cm³

• 24 g/cm³

Why do some substances float on water?

• they are warmer than water

• they are cooler than water

• they are more dense than water

• they are less dense than water

Helium balloons rise on earth because

• helium is less dense than air

• helium is more dense than air

• helium is cooler than air

• helium is warmer than air

Which units of measurement are used for volume?

• grams^3

• cm^3

What is the formula for Mass?

• Mass/Volume

• Density x Volume

• Mass/Density

What is the formula for Volume?

• Mass/Volume

• Density x Volume

• Mass/Density