Table of Contents
- 1 Which one of the following represents the number of units of each substance?
- 2 Which one of the following is the number you place to the left of the formula for a substance?
- 3 Which of the following represents a decomposition reaction?
- 4 In what type of reaction do two or more substances combine to form a single new substance?
Which one of the following represents the number of units of each substance?
Chapter 21
| Question | Answer |
|---|---|
| Coefficient | Represent the number of units of each substance taking part in each substance. |
| Combustion Reaction | Occurs when a substance reacts with oxygen. |
| Decomposition Reaction | Occurs when one substance breaks down, decomposes, into two or more substances. |
What type of reaction occurs when a substance breaks down into two or more substances?
decomposition reaction
A decomposition reaction is a reaction in which a compound breaks down into two or more simpler substances. Example decomposition reactions are given.
What is it called when one or more substances change to produce one or more different substances?
A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
Which one of the following is the number you place to the left of the formula for a substance?
coefficients
The relative numbers of reactant and product species are represented by coefficients (numbers placed immediately to the left of each formula). A coefficient of 1 is typically omitted.
What does the symbol S represent?
For example, a red octagon is a common symbol for “STOP”; on maps, blue lines often represent rivers; and a red rose often symbolizes love and compassion. Numerals are symbols for numbers; letters of an alphabet may be symbols for certain phonemes; and personal names are symbols representing individuals.
What represents the number of units of each substance in a chemical equation?
These numbers, called coefficients, represent the number of units of each substance taking part in a reaction. amu (12.01 amu + (2 × 16.00 amu)).
Which of the following represents a decomposition reaction?
A decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: AB → A + B. Examples of decomposition reactions include the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen.
What is an example of a chemical reaction during which a single substance breaks down?
“Chemical Reactions”
| A | B |
|---|---|
| synthesis reaction | a reaction in which two or more substances react to form a single substance |
| decomposition reaction | reaction in which a compound breaks down into two or more simpler substances |
| single-replacement reaction | a reaction in which one element takes the place of another element in a compound |
What are the substances produced in a chemical reaction called?
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.
In what type of reaction do two or more substances combine to form a single new substance?
Combination reactions
Combination reactions occur when two or more substances combine to form a new substance.
What does the symbol Y represent?
The latin letter y is used to represent a variable or coefficient. Most commonly, y is the vertical dimension in the 2D cartesian coordinate system.