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Worksheetschemical & chemical substances
Total questions: 20
Worksheet time: 10mins
Which of the following is not a pure substance?
Iron
Rain water
Air
Oxygen gas
The chemical formula of carbon dioxide is-
CaO
CO
CO2
None
The chemical formula of sodium is.
So
No
Na
Sd
what is the symbol of gold ?
Au
Ag
Go
Ne
The smallest particle of an element; made of electrons, protons, and neutrons
Atoms
Elements
Molecules
Products
The simplest unit of a chemical compound that can exist; formed when two or more atoms join together chemically
Atom
Compound
Molecule
Identify what type of change happening in the picture below...
Chemical Change
Physical Change
Endothermic Reaction
Exothermic Reaction
Identify what type of change happening in the picture below...
Chemical Reaction
Physical Change
Change in State
Change in appearance only
What is two or more substances that are together in the same place but their atoms are not chemically bonded.
Mixture
Solution
Colloid
Suspension
What is "Conservation of Mass"?
Combination of one or more substances to create one or more different substances
Physical change of state in which identity of the substances remains the same
Law stating that the mass of products equals the mass of reactants
Open system in which some matter escapes
In the chemical equation pictured, what would be the total mass of the product if the total mass of the reactants is 12 grams?
6 grams
12 grams
24 grams
2 grams
The gold symbol is derived from the Latin or Greek word is from
Ferrum
Aurum
Natrium
Atrium
What are the blue numbers called?
oxidation numbers
subscripts
group numbers
product numbers
How many molecules of KNO3 are shown?
1
2
3
4
Which of the following is a molecule?
copper
ferrum
oxygen we inhale
none of these
The atomicity of sulphur is
(a)
Which of the following is correct representation of carbon monoxide?
Co
cO
none of these
CO
Which of the following is not a pure substance?
Iron
Rain water
Air
Oxygen gas
