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WorksheetsChemical reactions retake quiz
Total questions: 10
Worksheet time: 5mins
In a chemical equation, a(n) _____________ tells you how many atoms or molecules of a reactant or a product take part in a reaction.
coefficient
subscript
mickey mouse
chemical change
In a(n) ____________________ change, elements and/or compounds rearrange to form new substances.
acidic
physical
chemical
combustion
____________________ changes occur when bonds form between atoms, or when bonds break and new bonds form.
catalyst
physical
solid
chemical
The process of solid ice changing into liquid water is a(n)______________ change.
decomposition
physical
chemical
The production of a gas when acid is added to a sample of chalk is an indication of a(n) ____________________ reaction.
solid liquid gas
decomposition
physical
chemical
The _________________________ of a compound shows the ratio of elements present in the compound.
coefficient
subscript
chemical
yield sign
In a(n) ____________________ reaction, the products are simpler substances than the reactant.
compound
decomposition
chemical
physical
How many elements are in... 2Al(OH)
3
4
2
5
How many atoms are in the formula unit (NH₄)₂CO₃?
13
15
14
11
Which of the following does NOT increase the number of particles of a substance available to react in a chemical reaction?
increasing the concentration
increasing the surface area
adding a catalyst
increasing the mass
