Worksheetsunit 2-Chemical changes
Total questions: 18
Worksheet time: 9mins
Which is evidence of a chemical reaction?
the light produced by magnesium when burned
the evaporation of water from a solution
the fizzing of a soft drink
the heat from a light bulb
Select the compound
Ammonia(NH3)
Neon (Ne)
Ozone (O3)
Nitrogen(N2)
Select the Compound
Water (H2O)
Magnesium(Mg)
Iron(Fe)
Copper(Cu)
A sample of matter is made of identical particles. The sample could be
a mixture
an atom
a molecule
an element
What is a trait a sample must have to be an element?
sample has different types of particles
the sample can only be seen with a microscope
the sample is a liquid at room temperature
the sample is made of only one type of atom
What chemical symbol is used for copper
C
Cu
Cp
Co
What chemical symbol is used for Iron?
Pb
I
Fe
Ir
Which describes a property of all elements?
all elements exist in the solid phase
All elements are pure substances
all elements are metals
all elements have six electrons
Which of these is the chemical symbol for magnesium?
Mu
Mn
Mg
Ma
A student sees the diagram shown in a textbook. What does the symbol in the diagram represent?
a compound
a molecule
an isotope
an element
The chemical symbol for niobium is Nb. Based on its symbol, what can be concluded about niobium?
it is a compound
it is an element
it is a metal
it is a mixture
Which combination of letters can be used as a chemical symbol for an element?
BR
Chi
Dy
FeO
Which event is an example of a chemical change?
grinding peppercorn into pepper flakes
ice cream melting in the sunshine
wood burning in a fireplace
fog rising off a river
Which is an example of a chemical change taking place?
An ice cube melting
A baker mixes flour an sugar to make dough
a piece of metal is cut in half
roasting marshmallows over a burning fire
When iron combines with oxygen rust forms this is because of a
physical reaction
chemical reaction
change in density
change in temperature
Which is an example of a chemical change?
a nail rusting in water
sand separated from water by filtering
water evaporating from a puddle
a rock being eroded by wind
Which of these is an example of a chemical change?
salt dissolving
wood burning
water boiling
ice melting
Lighting a match and baking a cake are both chemical changes. Why?
they create energy
they change volume
they create a new substance
they change the state of matter
