Mixing baking soda and vinegar creates carbon dioxide gas.  Is this a chemical or physical change?

What term best describes: a solution that contains 70g of NaNO3 per 100 mL H2O at 30°C

A change that alters the form, shape or appearance of a material but does not make the material into a new substance.

A homogeneous mixture of metals is called a(n):

Which of these is not a physical property of a substance?

Which of these substances is super-saturated when 60 grams is dissolved in 100 g of water at 30°C.

Based on the information shown, what percentage do the elements carbon and oxygen account for in the universe?

A substance that cannot be broken down into a simpler form by ordinary chemical means is called a(n)

What term best describes: a solution that contains 60g of NH4Cl per 100 mL H2O at 80°C:

Carbon Dioxide (CO2) is an element?