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WorksheetsIdentifying Chem Rxn TEST
Total questions: 25
Worksheet time: 13mins
A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound.
coefficient
molecule
subscript
reciprocal
Physical and chemical characteristics of matter used to describe or identify a substance.
Properties
Precipitate
Chemical Reaction
Molecule
An insoluble solid formed from a chemical reaction.
Precipitate
Chemical Reaction
Molecule
Compound
to change the order or position of something
rearrange
chemical reaction
product
model
Is a change in matter that produces one or more new substances
precipitate
endothermic reaction
chemical reaction
activation energy
A shorthand representation of an element or compound using chemical symbols.
Chemical Equation
Chemical Formula
Molecule
Subscript
A representation of a chemical reaction using chemical symbols for elements and compounds.
Chemical Formula
Chemical Equation
molecule
subscript
The number in front of an element or compound that indicates the number of molecules in a chemical formula.
coefficient
subscript
The number written after an element’s symbol in a chemical formula that indicates the number of atoms of a specific element.
coefficient
subscript
Elements or compounds on the left side of a chemical equation.
Coefficient
subscript
reactants
products
Elements or compounds on the right side of a chemical equation.
reactants
products
coefficient
subscript
Harrison is making cake. He prepares some batter and places it into the oven. Harrison realizes a gas, carbon dioxide, is coming out of the batter as it bakes.
Which options are true about carbon dioxide?
It is a new gas that forms during baking.
It is made of atoms that did not exist before.
It is the dough changing states from solid to gas.
Complete the sentence.
During a chemical reaction, atoms ________.
can appear
can disappear
get rearranged
stop moving and vibrating
What always happens in a chemical reaction?
Some atoms of existing substances disappear.
Some substances change phase.
New atoms appear and form new substances.
New substances form from atoms of existing substances.
Identify the product(s) in the following chemical reaction:
Chromium oxide + Carbon → Chromium + Carbon monoxide
Chromium and carbon.
Chromium and carbon monoxide.
Chromium oxide and carbon.
In chemical reactions, a product is _________.
any substance that is made of the greatest number of atoms
any substance that is made from the least number of atoms
any substance that is to the left of the arrow
any substance to the right of the arrow
What is the role of the arrow sign in a chemical reaction?
Making sure atom counts on each side are the same.
Separating products and reactants.
Showing which substances were in the container first and which substances were added later.
Showing which substances are solids and which are liquids or gases.
What happens when chemical bonds break and new bonds form?
A physical change
Matter is destroyed
A chemical reaction
A solid that is deposited from a solution
Solid
Liquid
Product
Precipitate
A substance produced during a chemical reaction
Product
Reactant
Properties
Physical and chemical characteristics of matter used to describe or identify a substance
Chemical Reaction
Properties
Product
A substance that takes part in and undergoes change during a reaction
Product
Molecule
Reactant
What is a chemical reaction?
a change in matter when the molecules rearrange to make new molecules
a change in matter when matter changes its form or appearance
a change in matter when the physical appearance changes
a very boring change in matter
Which is the correct description of photosynthesis
Photosynthesis is a chemical reaction because the atoms of the molecules get rearranged to form new molecules
Photosynthesis is a chemical reaction because the molecules stay the same before and after the change
Photosynthesis is a physical change because nature makes it happen
Photosynthesis is a physical change because the atoms stay the same
Signs of a chemical change could be:
a change in energy (temperature, light, sound)
a precipitate forms (a solid forms from 2 liquids)
formation of gas (bubbles)
shocking change in color
all of these answers are signs of chemical change
