CHEMICAL FORMULAS
How many oxygen atoms are in CaCO₃?
3 oxygen atoms
Ice melting is what type of change?
Physical change
A mixture that is evenly distributed throughout is called what?
Homogeneous mixture
What causes water molecules to stick to other water molecules?
Cohesion
What law states that matter is not created or destroyed during a chemical reaction?
Law of Conservation of Mass
How many total atoms are in 2NaHCO₃?
12 total atoms
Paper being ripped is what type of change?
Physical change
A mixture in which substances are unevenly distributed is called what?
Heterogeneous mixture
What causes water to stick to the sides of a container?
Adhesion
If a reaction starts with 50 g of reactants, what should the total mass of the products be?
50 g
In Al₂(SO₄)₃, how many aluminum atoms are there?
2 aluminum atoms
Iron rusting is what type of change?
Chemical change
Is salt water homogeneous or heterogeneous?
Homogeneous
Water forming rounded droplets is an example of what property?
Cohesion
A reaction has 70 g of reactants. One product has a mass of 45 g. What is the mass of the other product?
25 g
In 2Al₂(SO₄)₃, how many oxygen atoms are there?
24 oxygen atoms
A student observes bubbles forming during a reaction. What could this be evidence of?
A chemical reaction / formation of a new substance
Is trail mix homogeneous or heterogeneous?
Heterogeneous
An acid has a pH that is ______ 7.
Less than 7
A reaction starts with 85 g of reactants. One product has a mass of 32 g. What is the mass of the other product?
53 g
In 3Mg(NO₃)₂, how many Mg, N, and O atoms are there?
3 Mg, 6 N, and 18 O
During a reaction, the temperature changes from 22°C to 19°C and bubbles form. Can this still be a chemical reaction? Explain.
Yes. A chemical reaction can cause the temperature to decrease. The bubbles are also evidence of a reaction.
A particle diagram shows different particles evenly spread throughout the container. What type of mixture does it represent?
Homogeneous mixture
A substance has a pH of 11. Is it an acid or a base? How do you know?
Base; bases have a pH greater than 7.
A reaction combines 50.0 g CaCl₂ and 20.0 g F₂. It produces 45.0 g CaF₂. What mass of Cl₂ must be produced?
25.0 g Cl₂