Which of the following statements describe the physical properties of a penny?

A) It is smooth and shiny

B) It is light and thin

C) It turns brown in water

D) It gets hot in the sun

There may be more than one answer

Charles' law explains which of these phenomena? A. why a balloon deflates when the air around it cools B. why solids require heat in order to change into gases C. why the pressure of a gas increases when volume decreases D.

How many gram-atoms are in 120-gram sample of calcium metal? How many atoms is this?

How was the periodic table arranged

What processes occur in a plant leaf?

What is the specific environmental in which organism lives?

The charge of the stable ion of P

A change in the properties of matter where chemical bonds are broken and new bonds are formed is a.) a chemical change b.) a physical change c.) an ionic change d.) a covalent change

Write a chemical equation for the chemical reaction in which calcium carbonate (CaCO3) produces calcium oxide (Cao) and carbon dioxide (CO2).

How do you know the difference between a compound and mixture?

A 68.4-g sample of potassium chloride was added to 200.0g of water at 20 degrees C. Is the solution saturated, unsaturated, or supersaturated?