What does the phrase "the reorganization of reactants into products" describe?
a physical reaction
a chemical reaction
a chemical formula
an element
Coal is made of carbon. Coal burns at high temperatures in the presence of oxygen. The result of this chemical reaction is
more of the same coal.
coal with different physical properties.
a new chemical compound.
the creation of new elements.
Use the following chemical reaction to answer questions 3 to 5.
How many atoms of reactant are there?
2
4
6
12
Gillian mixes 5 grams of sulfur dioxide (SO₂) with 6 grams of water, in a 10-gram, stoppered test tube. After the reaction, she weighs the test tube and its contents. What product mass (H+ + HSO₃-)does she record in her laboratory report?
5 g
6 g
11 g
21 g
The Law of Conservation of Mass states that which of the following will always be equal before and after a chemical reaction?
the number of atoms of product and atoms of reactant
the number of molecules of product and molecules of reactant
density of the reactants
the surface area of the product and the reactant
