Junior Cert Science - Chemistry

What is the approximate percentage composition of carbon dioxide in the atmosphere?
1. < 1%
2. 0%
3. 21%
4. 78%
What is the correct chemical formula for carbon dioxide?
1. CO₂
2. C₂O
3. CaO
4. CO
Which of the following words are missing from the sentence below?"
Carbon dioxide is produced by ____________ and used up in ___________________.
1. respiration and photosynthesis respectively.
2. photosynthesis and respiration respectively.
3. transpiration and photosynthesis respectively.
4. fluoridation and photosynthesis respectively.
Which one of the following word equations is correct?
1. calcium carbonate + hydrochloric acid -----> calcium chloride + carbon dioxide + water
2. calcium carbonate + hydrochloric acid -----> carbon dioxide + water
3. calcium carbonate + hydrochloric acid -----> calcium chloride + carbon dioxide
4. calcium carbonate + hydrochloric acid -----> calcium chloride + water
Which one of the following equations is correctly balanced?
2. calcium carbonate + hydrochloric acid -----> carbon dioxide + water
3. calcium carbonate + hydrochloric acid -----> calcium chloride + carbon dioxide
4. calcium carbonate + hydrochloric acid -----> calcium chloride + water
In the apparatus shown for preparing oxygen gas, name the chemical A and the piece of apparatus B.
1. A = hydrogen peroxide and B = gas jar
2. calcium carbonate + hydrochloric acid -----> carbon dioxide + water
3. calcium carbonate + hydrochloric acid -----> calcium chloride + carbon dioxide
4. calcium carbonate + hydrochloric acid -----> calcium chloride + water
Which of the following combinations best describes the percentage composition of the main gases in our atmosphere?
1. 78% nitrogen, 21% oxygen and 1% the remainder of gases.
2. calcium carbonate + hydrochloric acid -----> carbon dioxide + water
3. calcium carbonate + hydrochloric acid -----> calcium chloride + carbon dioxide
4. calcium carbonate + hydrochloric acid -----> calcium chloride + water
Which one of the following is NOT a physical property of carbon dioxide gas?
1. colourless
2. turns limewater milky white
3. odourless
4. heavier than air
Which one of the following is the confirmatory test for carbon dioxide gas?
1. It burns with a pop.
2. It turns limewater milky.
3. It burns in air with a blue flame.
4. It supports combustion.
Which one of the following substances is completely different in composition from the other three?
1. Limestone
2. Marble
3. Calcium carbonate
4. Carbon dioxide
Complete the following word equation for the reaction that takes place when carbon dioxide is bubbled through limewater.
Limewater + carbon dioxide gives:
1. calcium carbonate + water
2. carbon dioxide + water
3. calcium carbonate + carbon dioxide
4. calcium + water
The diagram shows carbon dioxide gas being poured from one gas jar into another. This demonstrates that:
1. carbon dioxide is heavier than air
2. carbon dioxide is lighter than air
3. carbon dioxide has the same density as air
4. carbon dioxide does not burn in air
If carbon dioxide gas is bubbled through water and the resulting solution tested with both red and blue litmus paper, which one of the following is most likely to occur?
1. The blue litmus paper turns red.
2. There is no change in colour of either litmus papers.
3. The red litmus paper turns blue.
4. The red litmus paper changes colour to blue, while the blue litmus paper turns red.
Carbon dioxide dissolves slightly in water to form an acidic solution. This solution is known as:
1. carbonic acid
2. hydrochloric acid
3. ethanoic acid
4. sulfuric acid
Which one of the following is NOT a use of carbon dioxide?
1. Fizzy drinks
2. Fire extinguishers
3. Special effects on stage
4. It is bubbled through fish tanks
Which one of the following statements is FALSE with reference to dry ice?
1. It changes into a solid at -78 degrees Celsius.
2. Fire extinguishers
3. Special effects on stage
4. It is bubbled through fish tanks
Carbon dioxide gas is prepared in the laboratory using:
1. marble chips and dilute hydrochloric acid
2. calcium chloride and dilute hydrochloric acid
3. marble chips and carbonic acid
4. calcium carbonate and water
Which one of the following chemicals is used to test for carbon dioxide?
1. limewater
2. limescale
3. limesoda
4. calcium carbonate
What is observed when dilute hydrochloric acid is added to calcium carbonate?
1. The mixture fizzes.
2. The mixture turns black.
3. Nothing happens.
4. The mixture reacts explosively with a burning flame.
What happens when a lighted splint is placed in a test-tube containing carbon-dioxide gas?
1. The lighted splint goes out.
2. The lighted splint bursts into flames.
3. A loud pop is heard.
4. The lighted splint burns with a blue flame.
"Smoke" from dry ice on a stage falls to the ground because:
1. carbon dioxide gas is heavier than air
2. The lighted splint bursts into flames.
3. A loud pop is heard.
4. The lighted splint burns with a blue flame.
Ice is placed in a stoppered test-tube as shown. After a few minutes, a piece of cobolt chloride paper is placed against the outside of the test-tube. Which of the following is most likely to occur?
1. The cobolt chloride paper changes from blue to pink/red.
2. The cobolt chloride paper changes from blue to white.
3. The cobolt chloride paper changes from pink/red to blue.
4. The cobolt chloride paper changes from pink/red to white.
Calcium carbonate is one of the major components of:
1. chalk
2. lipstick
3. table salt
4. vinegar
Steel wool is placed in a test-tube which is then inverted in a beaker of water as shown. After a week or so, the level of water in the test tube rises. What does this experiment demonstrate?
1. That there is carbon dioxide in the air.
2. That carbon dioxide is necessary for rusting.
3. That the air contains nitrogen.
4. That water is necessary for rusting.
A substance that alters the rate of a chemical reaction, but does not get used up in the reaction is known as:
1. a catalyst
2. a catholic
3. a catalyic converter
4. a pollutant
Complete the following word equation:
1. oxygen + water
2. carbon dioxide + water
3. hydrogen + water
4. hydrogen + carbon dioxide
Which one of the following chemical equations is balanced?
Name the pieces of apparatus labelled A and B in the diagram.
1. A = delivery tube, B = trough.
2. A = tap funnel, B = trough.
3. A = tap funnel, B = beehive shelf.
4. A = gas jar, B = trough.
A glowing splint is placed in a test-tube of oxygen gas as shown in the diagram. Which of the following is most likely to occur?
1. The glowing splint will rekindle (relight).
2. The glowing splint will become extinguished.
3. The glowing splint will ignite with a pop.
4. No change occurs to the glowing splint.
Hot charcoal (carbon) is burned in oxygen as shown in the diagram. Name the instrument labelled X.
1. Combustion spoon
2. Wooden spoon
3. Gas jar
4. Tongs
When charcoal burns in oxygen, which of the following gases is produced?
1. carbon dioxide
2. carbon monoxide
3. water vapour
4. nitrogen gas
Which one of the following equations is correct for the burning of magnesium in air?
The burning of a fuel in oxygen is commonly known as
1. filtration
2. combustion
3. evaporation
4. sublimation
Nitrogen gas changes into a liquid at a temperature of
1. 100 degrees Celsius
2. -196 degrees Celsius
3. 0 degrees Celsius
4. 15 degrees Celsius
Which one of the following gases is used up when magnesium burns in air?
1. oxygen
2. carbon dioxide
3. nitrogen
4. water vapour
Which one of the following is NOT a property of oxygen?
1. colourless gas
2. poisonous gas
3. slightly soluble in water
4. supports combustion
Which one of the following gases is the LEAST abundant in our atmosphere?
1. nitrogen gas
2. oxygen gas
3. carbon dioxide
4. natural gas
Which of the following pairs of scientists are credited with the discovery of oxygen in the 1700s?
1. Batman & Robin
2. Watson & Crick
3. Lavoisier & Priestley
4. Pierre & Marie Curie
Which noble gas is present in light bulbs so as to prevent the filament from burning and melting?
1. argon
2. nitrogen
3. krypton
4. helium
Which one of the following gases is present in our atmosphere as a major pollutant?
1. nitrogen
2. sulfur dioxide
3. hydrogen
4. oxygen
Manganese dioxide is a catalyst used in the preparation of oxygen gas. Which one of the following best describes manganese dioxide?
1. fine black powder
2. blue crystals
3. yellow powder
4. shiny metallic granules
Approximately how much of the air is composed of oxygen?
1. one fifth
2. four fifths
3. one tenth
4. one quarter
When carbon is burned in oxygen, the product formed is dissolved in water and then tested with both red and blue litmus papers. Which of the following is most likely to happen?
1. The red litmus paper turns blue.
2. The blue litmus paper turns red.
3. There is no colour change in both litmus papers.
4. Both litmus papers change colour.

Junior Cert Science - Chemistry - The Atmosphere

Multiple Choice Quiz