# What is true of the total mass of reactants compared to the total mass of products?

## What is true of the total mass of reactants compared to the total mass of products?

One of these is called the law of conservation of mass , which states that during a chemical reaction, the total mass of the products must be equal to the total mass of the reactants. So, the total mass of reactants equals the total mass of products, a proof of the law of conservation of mass.

## What is a starting substance in a chemical reaction?

These starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products. between reactants and products.

How does a chemical reaction occur?

Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.

What happens to the number of atoms before and after a reaction?

According to the law of conservation of matter, the number of atoms before and after a chemical reaction should be equal, such that no atoms are, under normal circumstances, created or destroyed.

### Why is the mass less after a chemical reaction?

Explanation: According to the Law of Conservation of Mass, mass cannot be created or destroyed. Therefore in any chemical reaction the mass of the products must equal the mass of the reactants.

### What is the mass of the products?

Mass of products is equal to mass of reactants. This equation can be read in “moles” by placing the word “moles” between each coefficient and formula. A mole-mole factor is a ratio of the moles for any two substances in an equation.

What does the arrow mean in a chemical equation?

The chemical reaction arrow is one straight arrow pointing from reactant(s) to product(s) and by-products, sometimes along with side products. The single arrow emphasizes one direction of chemical change (from A to B).

Are atoms rearranged in a chemical reaction?

During a chemical reaction no atoms are created or destroyed. The atoms are rearranged. This results in the formation of new substances with different properties to the starting substances.

#### How are atoms present at the start and end of a chemical reaction?

All the atoms present at the start of a reaction are present at the end true At the end of a chemical reaction, what is the total mass of the reactants compared to the total mass of the products the total mass of the reactants must be equal to the total mass of the product what is the principle called the conservation of mass

#### What happens to the electrons in an atom?

An atom always starts out with a fixed number of electrons, given by the atomic number. The electrons of the atomic number fill the electron shells from the inside out, leaving the remaining electrons in the outside shell.

What do you call the materials at the beginning of a chemical reaction?

The materials you have at the beginning of a chemical reaction are called reactants The amount of one material in a given volume of another material is called a concentration A chemical reaction in which one element replaces another in a compound trade places, is called a

Which is a chemical reaction that breaks down a compound into simpler products?

A chemical reaction that breaks down compounds into simpler products is called decomposition A chemical reaction in which two or more substances combine to make a more complex compound is called synthesis reaction The materials you have at the beginning of a chemical reaction are called