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WorksheetsGrade 8 Q2 Review Quiz
Total questions: 20
Worksheet time: 20mins
What is one of the characteristics of chemical change?
There is a change in the shape of the substance.
A new substance is formed.
No new substance is formed.
Mostly are reversible changes.
These are the observations that we can make to see the chemical changes, except...
Size change
Color change
Bubbles formed
light formed
When 23 grams of sodium react with 32 grams of oxygen, how many grams of sodium oxide is produced?
65 grams
55 grams
45 grams
35 grams
The ratio by mass of carbon and oxygen is 3:8 in the compound carbon dioxide. If 6 grams of carbon used to produce carbon dioxide, how many grams of oxygen is needed?
24 grams
16 grams
8 grams
4 grams
What is the chemical formulae of this compound?
PCl3
NH3
BF3
CCl4
What do we do to change the ice to become water?
Decrease its temperature
Increase its temperature
Stabilize its temperature
Put the ice in the refrigerator
These are the main properties of non-metals, except...
Low melting points
Brittle
Shiny
Insulators
What do we do to store the alkali metals?
Store the metals with water
Store the metals with oil
Store the metals with oxygen
Store the metals with acid
From the list of elements in group 1, which element is the most reactive?
Magnesium
Potassium
Sodium
Lithium
The reaction between sulfuric acid with sodium oxide will produce?
Sulfuric oxide
Sodium oxide
sodium acid
potassium oxide
Who was the scientist who made the grouping of elements called triads?
John Newlands
Dmitri Mendeleev
Amedeo Avogadro
Johan Wolfgang Döbereiner
All of the following are correct triad groupings, except....
P, As, B
Cl, Br, I
Ca, Sr, Ba
S, Na, Ba
John Newlands arranged all the elements known at the time into in order of relative atomic mass. The pattern showed that each element was similar to the element eight places ahead of it. The name of this arrangement is...
Triplet
Duplet
Octaves
Triads
When did Dmitri Mendeleev publish his periodic table which is arranged according to increasing atomic mass?
1869
1866
1863
1860
The arrangement of the current periodic table is based on...
Decreasing the atomic number
Decreasing the atomic mass
Increasing the atomic mass
Increasing the atomic number
These are the product from burning the fireworks, except
Light
Food
Noise
Smoke
The type of fireworks which consist of gunpowder and a fuse wrapped tightly in a paper is
Rocket
Firecrackers
Aerial Fireworks
Sparklers
What is the source of color in the fireworks?
Dextrin
Alkali metal salt
Acidic oxide
Table salt
What is the substance that can produce green color in the firework?
Sodium salt
Calcium salt
Strontium salt
Barium salt
Which part of the body is most often injured by fireworks?
Arms
Hands
Eyes
Legs
