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WorksheetsUnderstanding chemical reactions
Total questions: 18
Worksheet time: 6mins
Matter can undergo two types of reactions what are they ?
chemical and mental
physical and chemical
physical and mental
physical and directional
A physical change does not produce new substances ?
True
False
The starting substances and the substances produced have the same physical and chemical properties
True
False
What is a chemical reaction?
A chemical reaction is a description of a reaction using element symbols and chemical formulas.
A chemical reaction is a process in which atoms bond to form a compound.
A chemical reaction is a process in which atoms of one or more substances rearrange to form one or more new substances.
What are signs of a chemical reaction?
odor
state of matter
color
all of the above
If substances get warmer or cooler or if they give off light or sound, it is likely that a reaction has occurred.
true
false
you can be 100% sure, that a chemical reaction happens if the physical properties have changed
true
false
the only way to make sure if the substance had a chemical reaction is by?
studying the physical properties of the substances before and after the change.
studying the natural properties of the substances before and after the change.
studying the elements properties of the substances before and after the change.
.
studying the chemical properties of the substances before and after the change.
there are a few types of substances what are they?
elements
metals
mixture
compound
In a chemical reaction, atoms of elements or compounds rearrange and form different elements or compounds?
False
True
what's the chemical symbol of Iron
I
Ir
Fe
o
What is a chemical equation?
A chemical equation is all the details about the element that had a chemical reaction.
A chemical equation is a description of a reaction using element symbols and chemical formulas.
A chemical equation is a symbol used to show what the name of the element is.
The starting subtances of a reaction are?
products
mixtures
reactants
What is a product?
the starting substances in the chemical reaction
is the answer of multiplication
the substance the chemical reaction makes
what is a chemical formula?
Chemical formulas are used to describe the reactants and the products.
Chemical formulas are used to describe the details about the elements
all of the above
The reactants are written to the right of the arrow, and the products are written to the left of the arrow.
True
False
the law of conversation of mass?
states that the total mass of the reactants before a chemical reaction is the Different from the total mass of the products after the chemical reaction.
states that the pressure of a given quantity of gas varies inversely with its volume at constant temperature
states that the total mass of the reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction.
is a number placed in front of an element symbol or chemical formula in an equation?
(a)
