NEW
Font size
WorksheetsUnit 1 Matter Common Assessment
Total questions: 25
Worksheet time: 13mins
What is the 2 called in the product of the balanced equation below? H₂ + Cl₂ = 2HCl
subscript
coefficient
atomic number
atomic mass
Which chemical equation supports the law of conservation of matter?
H₂O₂ → H₂O + O₂
2 Fe₂O₃ + 3 C → 4 Fe + 3 CO3
SO₄ + O₂ + 2 H₂O → 4 H₂SO₄
Mg + 2 HCl → MgCl₂ + H₂
Which chemical equation shows a chemical reaction where mass is conserved?
FeS + HCl → FeCl₂ + H₂S
2Cu2O + C → 4Cu + CO₂
Fe₂O₃ + C → Fe + CO₂
Fe + H₂SO₄ → FeSO₄ + 2H₂
There are many gases in our atmosphere. Which gas is made by combining two different elements?
oxygen
nitrogen
methane
helium
Which example is a physical change?
burning paper
boiling water
rotting vegetables
rusting iron fence
Which activity is a chemical change for metal wire?
bending a piece of metal wire
coiling of a piece of metal wire
rusting of a piece of metal wire
cutting a piece of metal wire
During an experiment, a student placed a cube of solid baking soda in a glass dish. He added 10 drops of vinegar to the baking soda and recorded his observations.
1. Bubbles formed.
2. The dish became slightly colder.
3. The shape of the cube changed.
What type of change happened in the glass dish, and why?
a physical change as bubbles were formed
a physical change as the temperature decreased
a chemical change as the shape of the cube changed
a chemical change as the temperature changed and a gas was released
Examine the chemical equation. Which substance(s) is (are) broken apart?
N₂O
NH₄NO₃
N₂O and H₂O
NH₄NO₃ and H₂O
A student mixes 8 grams of chemical A with 6 grams of mixture B in a closed container. The chemicals react completely, and the products are formed. According to the Law of Conservation of Mass, what should be the mass of the products formed?
2 grams
6 grams
8 grams
14 grams
Which equation demonstrates the Law of Conservation of Matter during the formation of water?
2H₂ + O₂ → 2H₂O
2H₂ + 2O₂ → 2H₂O
H₂ + O₂ → H₂O
4H₂ + O₂ → 4H₂O
Which graphic equation best represents a balanced chemical equation?
A
B
C
D
The diagram shows the formation of water from hydrogen and oxygen. Which statement is true?
The reaction satisfies the Law of Conservation of Matter because only one type of substance is formed as a product.
The reaction satisfies the Law of Conservation of Matter because the number of each type of atom is the same in the products and reactants.
The reaction does not satisfy the Law of Conservation of Matter because the atoms are in different arrangements in the products and reactants.
The reaction does not satisfy the Law of Conservation of Matter because the new substance formed is made up of two types of atoms.
Study chemical equations 1 and 2. Which statement is true about the two reactions shown?
Both reactions satisfy the Law of Conservation of Matter.
Both reactions do not satisfy the Law of Conservation of Matter.
Reaction 1 satisfies the Law of Conservation of Matter, but reaction 2 does not.
Reaction 2 satisfies the Law of Conservation of Matter, but reaction 1 does not.
The chart shows a list of formulas. Which substances are compounds?
1, 2, 3, and 4
1, 2, 3, and 5
2, 4, 5, and 6
2, 3, 4, and 6
The box shows the formula for a common substance. Which statement is true about the substance?
It is composed of 2 atoms of hydrogen and 1 atom of oxygen.
It is composed of 3 different elements.
It is composed of 2 atoms of oxygen and 1 atom of hydrogen.
It is composed of 3 different compounds.
A key for elements is represented by colored circles. Which diagram would best represent water?
P
Q
R
S
Which equation is balanced to obey the Law of Conservation of Matter during the reaction?
Mg + Br₂ → 2MgBr₂
CH₄ + 2O₂ → 2CO₂ + H₂O
4Al + 3O₂ → 2Al₂O₃
Na + O₂ → Na₂O
The table shows the reactants and products of a chemical reaction. Which chemical equation represents the reaction?
CCl₄ + 4HCl → CH₄ + 4Cl₂
CH₄ + CCl₄ → 4Cl₂ + 4HCl
CCl₄ + 4Cl₂ → CH₄ + 4HCl
CH₄ + 4Cl₂ → CCl₄ + 4HCl
Two students conduct an experiment which requires mixing chemicals in a beaker. After the chemical reaction takes place, they notice the beaker feels warm to the touch. This is evidence of what type of reaction?
endothermic
exothermic
neutralization
oxidation
When cold temperatures are produced in a chemical reaction, the reaction is known as
exothermic
endothermic
suspension
vaporization
When coal burns, the reaction
releases heat and is endothermic
releases heat and is exothermic
absorbs heat and is endothermic
absorbs heat and is exothermic
Which best describes an exothermic reaction?
a physical change occurs
a salt is produced
energy is required
energy is released
Synthetic gas, a combination of carbon monoxide, hydrogen, and carbon dioxide, is produced by treating coal with steam and oxygen at a high temperature. This mixture can be used as a combustion fuel instead of methane or natural gas. How does synthetic gas differ from natural gas?
Natural gas is a better fuel because it occurs inside Earth, but synthetic gas is manufactured by people.
Natural gas is used without modification, but synthetic gas must be mixed with oxygen before it can be burned.
Natural gas is a limited natural resource, but synthetic gas is manufactured so it does not deplete a natural resource.
Natural gas is used as it is obtained from Earth, but synthetic gas is made by chemical modification of a natural product.
People make clothing using fibers that come from natural materials and from synthetic materials. How do these materials differ from one another?
Natural fibers are produced from materials made by plants or animals while synthetic fibers are produced by chemical changes to raw materials.
Natural fibers form threads that are woven to form cloth while synthetic fibers are linked together chemically to form cloth.
Natural fibers and synthetic fibers both come from plant sources but synthetic fibers are modified chemically to become stronger.
Natural fibers are not colored with dye but synthetic fibers are dyed many colors.
Synthetic fibers, such as nylon and rayon, have replaced a natural fiber, silk, for many uses. Which of these is most likely one of the reasons for this replacement?
Natural fibers make a cloth that cannot be cut into shapes as easily as synthetic fibers.
Natural fibers have more limited availability than synthetic fibers.
Synthetic fibers do not require using natural resources.
Synthetic fibers can be woven into cloth at a faster rate.
