Which of the following is evidence of a chemical change?

phase change

the formation of a gas

mass change

change in surface area

The scientific method includes which of the following? Select all that apply. question analysis hypothesis theory

What does the statement "the properties of salt are different from the properties of the elements that go into making them" mean?

Determine the density of a 23.4g block that when placed in 25.00mL of water causes the water to rise to a level of 28.70mL?

Chemical reactions can be detected by changes in: a. temperature b. color c. overall mass of the products compared to the mass of the reactants d. density of the products compared to the reactants

How many milligrams of sodium sulfide are needed to completely react with 25.00 ml of a 0.0100 m aqueous solution of cadmium nitrate, to form a precipitate of cds (s) ?

In the synthesis of barium carbonate from an alkali metal carbonate (M2CO3 where M is one of the alkali metals) a student generated 3.7 g of barium carbonate from 2.0 g of their alkali metal carbonate.

Give the state of matter that water is in as it moves through earths system

What happens to the volume of a substance as temperatures rises?

Find the total number of atoms in a sample of cocaine hydrochloride, c17h22clno4, of mass 22.5 mg.

What is the relationship between chemical equilibrium and the rates of forward and reverse reaction