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WorksheetsMastery Check Quiz - Chemical Reactions
Total questions: 20
Worksheet time: 10mins
(807.9.2) When a new substance is formed with different properties than the original substance it is called a
Chemical Change
Chemical Property
Physical Change
Physical Property
(807.9.8) Which of these describes a chemical change?
When liquid water is heated, it changes to a gas.
When a piece of rock salt is hit with a hammer, it forms smaller crystals.
A glass rod placed in a flame becomes hot.
Gasoline burns in an engine to form carbon dioxide and water.
(807.9.8) Which of the following is an example of a physical change?
Mixing baking soda and vinegar together, and this causes bubbles and foam.
A glass cup falls from the counter and shatters on the ground.
Lighting a piece of paper on fire and the paper burns up and leaves ashes.
Baking a birthday cake for your mother.
(807.9.8) If the chemical properties of a substance remain unchanged and the appearance or shape of an substance changes it is called a
Chemical change
Physical change
Both a physical and chemical change
Neither a physical or chemical change
(807.9.2) Which of the following occurs in all chemical changes?
New bonds form between atoms
Phase changes from solids to liquids, liquids to gases
New elements are formed
The temperature increases
Based on the law of conservation of mass, which of these is a true statement?
The mass of the products is always greater than the mass of the materials which react in a chemical change.
The mass of the products is always less than the mass of the materials which react in a chemical change.
Matter is neither lost nor gained during a chemical change.
A certain mass of material must be present for a reaction to occur.
(807.9.10) A chemical equation is shown below. What are the products of the reaction?
2Ca + O2 -> 2CaO
Ca
Ca and O2
CaO
Ca and O
(807.9.3) A scholar was asked to classify the two substances below based on their chemical formula. Which statement correctly classifies these substances?
Cl2 and Na
Both Cl2 and Na are compounds
Both Cl2 and Na are elements
Cl2 is a compound and Na is an element
Na is a compound and Cl2 is an element
The flask and its contents had a mass of 120 grams before the experiment and a mass of 120 grams after the experiment. Which conclusion can best be made from these measurements?
A phase change took place.
Energy was destroyed.
Matter was conserved.
New elements were formed.
Natural gas is a fossil fuel that can be burned to heat our homes. The reactants in this chemical reaction are natural gas and oxygen. The products are water and carbon dioxide. The word equation below can be used to represent this reaction
natural gas + oxygen ------> water + carbon dioxide
Which of the following is true about the mass of the reactants and the products?
The mass of the natural gas and oxygen will be less than the mass of the water and carbon dioxide.
The mass of the natural gas and oxygen will be greater than the mass of the water and carbon dioxide.
The mass of the natural gas and oxygen will be equal to the mass of the water and carbon dioxide.
The mass of the natural gas and oxygen will be destroyed to make water and carbon dioxide.
(807.9.4) Student 1 has a mixture and Student 2 has a compound. Both student will separate the parts of their substances. Which best describes a result of the separation processes?
Each part of the compound will gain mass during separation
Each part of the compound will have different chemical properties
Only the mixture will go through a chemical change
Only the mixture will release heat when the parts are separated.
Which of the following is an example of chemical change?
A plant collecting sunlight and turning it into food.
Filling up a balloon with hot air.
Taking a glass of water and freezing it by placing it in the freezer.
Your dog ripping up your homework.
The formula below represents the chemical reaction between the elements hydrogen and oxygen when the compound water is formed.
2H2 + O2 -> 2H2O
This equation supports the law of conservation of mass because
atoms of the elements hydrogen and oxygen react to form molecules of the compound water.
the mass of hydrogen and oxygen in the reactants is equal to the mass of the water in the product.
atoms of the elements hydrogen and oxygen are in the reactants and also in the products.
the total number of hydrogen and oxygen atoms in the reactants and products is twelve.
P4 + 5O2 → P4O10
In the reaction, 12 g of Phosphorus (P4) reacts with Oxygen (O2) to form 28 g of Tetraphosphorus Decaoxide ( P4O10). How many grams of Oxygen (O2) are involved in the reaction?
12g
16g
28g
40g
On the periodic table we can find sodium and chlorine. They can react to form sodium chloride, or salt. Which of the following words describes salt?
Atom
Element
Compound
Mixture
How is a compound different from a mixture?
Compounds are composed of one or more element NOT chemically bonded, and mixtures are composed of two or more different elements that are chemically bonded
Compounds have more atoms than mixtures
Mixtures are chemically bonded, compounds are not.
Compounds are composed of two or more different elements that are chemically bonded, and mixtures are composed of two or more different elements that are not chemically bonded.
Which of the following is an element?
Zinc Oxide 𝑍𝑛𝑂
Salt 𝑁𝑎𝐶𝑙
Carbon C
Chalk 𝐶𝑎𝐶𝑂3
Which of the following terms best describes the diagram pictured?
Element
Compound
Mixture of Elements
Mixture of Compounds
How many elements are contained in the compound vinegar (CH3COOH)?
3
6
8
10
N2 + 3H2 -> 2NH3
In the chemical equation pictured above, what is the coefficient of Hydrogen (H2) on the reactant side?
1
2
3
6
