Question 1

The equation below shows the products formed when a solution of silver nitrate $(	ext {AgNO}_3)$ reacts with a solution of sodium chloride $(	ext {NaCl)}$.

In this equation, the total mass of the reactants is

Accepted Answer

equal to the total mass of the products

Answer

greater than the total mass of the products

Answer

equal to the mass of $	ext {AgCl}$

Answer

less than the mass of $	ext {AgCl}$

Question 2

The graph below shows the change in ozone
concentration with altitude in Earth's atmosphere.
The data table below shows the average height
range above sea level, in kilometers (km), for the
different layers of Earth's atmosphere.

Which layer of Earth's atmosphere contains the
highest concentration of ozone?

Accepted Answer

middle stratosphere

Answer

upper troposphere

Answer

lower stratosphere

Answer

lower troposphere

Question 3

When calcium carbonate $(	ext{CaCO}_3)$ is heated, it decomposes to form calcium oxide $(	ext{CaO})$ and carbon
dioxide $(	ext{CO}_2). $The equation below shows this reaction. 
In this reaction, the mass of $	ext{CaCO}_3$.

Accepted Answer

equals the mass of $	ext{CaO}$ plus the mass of $	ext{CO}_2$

Answer

is greater than the mass of $	ext{CaO}$ plus the mass of $	ext{CO}_2$

Answer

equals the mass of $	ext{CaO}$ minus  the mass of $	ext{CO}_2$

Answer

is less than the mass of $	ext{CaO}$ plus the mass of $	ext{CO}_2$

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