# What are chemical formulas and equations?

## What are chemical formulas and equations?

A chemical formula identifies each constituent element by its chemical symbol and indicates the proportionate number of atoms of each element. In empirical formulae, these proportions begin with a key element and then assign numbers of atoms of the other elements in the compound, by ratios to the key element.

## What are 4 chemical equations?

The four main types of chemical reactions are synthesis, decomposition, single displacement, and double displacement. But, remember, some people use different names for these reactions.

What are the 5 chemical equation?

Classify reactions as synthesis, decomposition, single replacement, double replacement, or combustion.

### What are some common chemical formulas?

Formulas and trading names for some common chemicals

Common used name, trade names Chemical Name Chemical Formula
sodium monoxide sodium oxide Na2O
soot amorphous carbon C
sulphuric acid sulphuric acid H2SO4
table salt sodium chloride NaCl

### What is stoichiometry and why is it important?

Given a chemical reaction, stoichiometry tells us what quantity of each reactant we need in order to get enough of our desired product. Because of its real-life applications in chemical engineering as well as research, stoichiometry is one of the most important and fundamental topics in chemistry.

What is the full from of NMM?

Near Millimeter (wavelength) NMM. Network Management Multiplexer.

#### How do chemical formulae and equations work?

CLASS WORK Chemical formulae and equations Derivation of formulae (key points) Chemical Formula Definition:An expression which states the number and type of atoms present in a molecule of a substance. Chemical formulas such as HClO4 can be divided into empirical formula, molecular formula, and structural formula.

#### What should students know about chemical formulas?

Students should understand that chemical formulas: provide a list of the elements within the substance – eg potassium, sulfur and oxygen; provide a ratio of the elements in the substance – eg two parts potassium, 1 part sulfur, 4 parts oxygen; describe how substances change ‒ eg carbon + oxygen → carbon dioxide becomes C + O 2 → CO 2;

What are the word equations for the reactions in chemistry?

The word equations for a few of these reactions have been provided, though most likely you’ll be asked to provide only the standard chemical equations. 6 CO 2 + 6 H 2O → C 6H 12O 6 + 6 O 2 (balanced equation for photosynthesis) 6 carbon dioxide + 6 water yields 1 glucose + 6 oxygen. 2 AgI + Na 2S → Ag 2S + 2 NaI.

## How do you teach students to write formulas and equations?

Writing formulas and equations is not a skill that will develop after one or two lessons. It is a skill that should be an ongoing part of chemistry lessons. Use regular low stakes testing of word equations and simple chemical equations alongside the recall of formulas.