8th Grade CBA #1 Review (Chemistry)

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Each element is made up of atoms that have the same number of protons.

Front

How many different elements are present in the molecule 3 NH4C2H3O2?

Back

4 (Nitrogen, Hydrogen, Carbon, Oxygen)

Front

What are the properties of metals?

Back

Metals are typically good conductors of heat and electricity, malleable, ductile, and have a shiny appearance.

Front

What type of element is Iron?

Back

Metal

Front

What does the Law of Conservation of Mass state?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

If 16.0g of Oxygen reacts with Magnesium to produce 40.3g of Magnesium Oxide, how much Magnesium is needed?

Back

24.3g

Front

How many hydrogen atoms are in 4H2O?

Back

8

Front

What is density?

Back

Density is the mass of an object divided by its volume, often expressed in grams per cubic centimeter (g/cm³).

Front

Why do sand and rocks sink in water?

Back

The sand and rocks are more dense than water.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.