WorksheetsChemical Reactions, Formulas, and Equations
Total questions: 26
Worksheet time: 18mins
What gives information about the elements found in a molecule and tells you what atoms and how many of those atoms are found in a single molecule?
Chemical Formula
Chemical Reaction
Chemical Bond
Chemical Equation
A chemical formula uses ______ and numbers to describe the atoms in a molecule.
letters
shapes
colors
equations
The number (written as a _________) to the right of each element denotes how many atoms of that element are found in a single molecule
subscript
superscript
coefficient
exponent
If there is no number next to a symbol, there is ______________of that element in a single molecule
only one atom
no atoms
two atoms
multiple atoms
Parentheses are used to show “__________” of atoms within a molecule.
groups
forms
shapes
parts
To determine the total number of atoms in a formula with parentheses, distribute the number outside the parentheses by the number of atoms ____________
within the parentheses.
outside of the parentheses.
in the whole entire formula
A ___________ is the process that leads to the change of one set of chemical substances into another.
chemical reaction
chemical formula
chemical bond
chemical crossover
A chemical reaction is a ________ change.
chemical
physical
mechanical
technological
The substances that undergo the transformation in a chemical reaction are called the ___________
reactants
products
productions
reactions
The substances that are formed during a chemical reaction are called ___________.
products
reactants
reactions
productions
You cannot actually see bonds forming or breaking between atoms during a chemical reaction, but there are observations you can see that a change has taken place.
true
false
A ___________ forms. It is a solid that forms at the bottom of the container in which a chemical reaction takes place.
precipitate
precipitation
condensation
rock
If a burst of light or spark appears, this is an indicator that a chemical change has taken place.
true
false
A chemical ____________ uses chemical formulas, numbers, mathematical symbols and arrows to show what happens during the chemical reaction.
equation
reaction
formula
equestrian
Numbers (coefficients) in front of a chemical formula indicate how many ____________ are involved in a chemical reaction.
molecules
atoms
bonds
reactions
The arrow in a chemical equation symbolizes
the direction of the chemical reaction
the name of the chemical reaction
the signal of the chemical reaction
How many Hydrogen atoms are there in this formula?
12
6
1
0
How many molecules are shown here?
1
2
12
6
What would Ag + Cl be considered?
the reactants
the products
neither
What would AgCl be considered in this reaction?
the product
the reactant
neither
How many Nitrogen atoms are in this formula?
2
1
4
8
How many Hydrogen atoms are in this formula?
8
2
4
1
How many molecules are in this formula?
2
7
1
9
How many Oxygen atoms are in this formula?
7
14
2
4
How many Hydrogen atoms are in this formula?
16
8
2
4
How many total atoms are in this formula? (I put a longer time for this question)
38
19
14
no idea
