WorksheetsGrade 8 chemistry challenge
Total questions: 33
Worksheet time: 18mins
Both have fixed volume
Solid and gas
Liquid and gas
Solid and liquid
All metals are magnetic
True
False
Which type of rock is usually porous?
Igneous
Sedimentary
Metamorphic
What is the colour of litmus solution with alkalis
Red
Blue
Yellow
How many elements in K2SO4
3
7
2
4
Group 3
Period 7
Group 7
Period 3
B in Period 3
C in group 2
A in group 4
Which chemical symbol is potassium
K
P
S
Si
Which compound belong to hydroxides?
Li2O
NaCl
H2S
KOH
Which pH value is strong acid
2
7
5
12
Which layer is mantle?
A
B
C
D
Lithium + sulfuric acid ⟶
Lithium sulfide
Lithium sulfate + water
Lithium sulfate + hydrogen
Calcium + water ⟶
Calcium oxide
Calcium hydroxide
Calcium hydroxide + hydrogen
Which type of rock is harder?
Igneous
Sedimentary
Acids
Have pH higher than 7
Turn red litmus to blue
Have sour taste
Most of non metals have high melting and boiling point
True
False
Which two elements are metals?
Calcium
Phosphorus
Aluminium
Sulfur
Which box represents mixture of elements and compounds?
Which box represents mixture of elements ?
Pure compound
Pure element
Mixture of elements
Both liquids and gases
Have non fixed volume
Can be compressed easily
Have random arrangement of particles
Choose the correct sentence about mixtures
Mixtures are pure substances
Mixtures can be separated by physical means
Mixtures contain only elements
Elements in mixtures are joined by chemical bonds
What happens during condensation?
Particles get further apart
Forces become weaker
Particles become arranged more randomly
Particles become arranged more orderly
Substance X melts at 500 oC andboils at 800 oC
X is liquid at 400 oC
X is gas at 700 oC
X is solid at room temperature
Which statement about the internal structure of the Earth is correct?
The crust floats on the outer Core
The inner core is solid and the outer Core is Liquid
The mantle is the coldest Part of the earth
The outer Core is the hottest Part of the earth
Mixture of four elements
Mixture of four compounds
Mixture of two elements and two compounds
Mixture of one element and three
compounds
Which scientist suggested a model for the atom
Copernicus
Darwin
Galileo
Rutherford
Which particle is positively charged?
Proton
Neutron
Electron
They are equal in an atom
Electrons and neutrons
Electrons and protons
Neutrons and protons
Both are found in the nucleus of the atom
Electrons and neutrons
Electrons and protons
Neutrons and protons
Which element is sulfur?
Na
S
Si
P
Choose 2 of them belong to the same period
2,8
2,4
2,8,2
2,8,8
When some drops of universal indicator added to neutral solution it turns
Red
Orange
Purple
Green
