Chemistry Equations

In a chemical reaction...

• New atoms are created

• Atoms rearrange

• Atoms are destroyed

• Nothing Happens

Tags

NGSS.MS-PS1-5

Magnesium + ________ --> magnesium oxide

What is missing?

• Hydrogen

• Sulphur

• Oxygen

• Oxide

There is more than one answer.

In a word equation the REACTANTS

• Are written on the left hand side of the arrow

• Are used up in a chemical reaction

• Are always the same

• Are the substances that react together

Identify the general form of all chemical equations.

• products → reactants

• acid + base → salt + water

• reactants → products

• metal + water → metal hydroxide + hydrogen

Identify one advantage of symbol equations compared to word equations. Symbol equations:

• are difficult to understand, so keep chemical knowledge restricted to scientists

• show exactly which elements are involved and the relative number of atoms of each

• use plain English

• show both the reactants and products

Tags

NGSS.MS-PS1-5

Select the option that best completes the following sentence. Chemical equations are balanced by changing:

• the number of reactants and products

• the coefficients in front of the chemical formulas

• the subscripts in the chemical formulas

• the positions of the reactants and products

• Carbon

• Hydrogen

• Oxygen

Tags

NGSS.MS-PS1-5

Tags

NGSS.MS-PS1-5

When you heat calcium carbonate – a white solid with the formula CaCO3 – it breaks down to form solid calcium oxide (CaO) and carbon dioxide gas (CO2). Write a word equation (use the word "produces" instead of an arrow)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Tags

NGSS.MS-PS1-5