7th Grade 1st Semester Review Part 2

Front

How many oxygen atoms are in (NH₄)₃PO₄?

Back

4

Front

How many atoms are represented in the reactants in the equation?

Back

5

Front

What effect do smaller salt crystals have on the rate of dissolving in water?

Back

Smaller crystals increase the surface area and speed up dissolving.

Front

How many of the following substances are elements: (list of five different substances)?

Back

3

Front

How does surface area affect the rate of dissolution?

Back

Higher surface area (more little pieces) dissolves faster.

Front

What is the definition of an element?

Back

A substance that cannot be broken down into simpler substances by chemical means.

Front

What is the chemical formula for phosphate?

Back

PO₄³⁻

Front

What is the relationship between surface area and reaction rate?

Back

Increased surface area leads to faster reaction rates.

Front

What is the definition of dissolution?

Back

The process of a solute dissolving in a solvent.

Front

What is a reactant in a chemical equation?

Back

A substance that undergoes a chemical change in a reaction.