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WorksheetsChemical Reactions
Total questions: 10
Worksheet time: 5mins
Which best describes a chemical reaction?
the rearrangement of atoms by breaking and reforming chemical bonds
a reaction that absorbs heat from the surroundings
a reaction that releases heat to the surroundings
the rearrangement of molecules based on temperature and pressure
Which is an example of a chemical reaction?
paper folded into tiny pieces
paper burned and turned into smoke
paper soaked in water
paper shredded and turned into pulp
Pedro wants to create a chemical reaction between oil and water. He adds oil to a beaker of water and notices that the liquids do not mix. He then shakes the beaker and the drops of oil become suspended through the water for a few moments before returning to their separate layers.
Did Pedro succeed in creating a chemical change?
Yes, because the oil was evenly suspended.
Yes, because the solution was permanently changed.
No, because the oil only briefly mixed with the water.
No, because no new substances were formed.
The Statue of Liberty is made out of copper and was once shiny and copper-colored. Over the years, the copper has gone through a process called oxidation, where it has changed into a new material.
What has occurred?
an endothermic reaction
an energy formation
a chemical reaction
a precipitate formation
Which of these most likely represents a chemical change?
water boiling
sugars digested by saliva
mud drying to dirt
ice cream melting
The expression CaCO3 → CaO + CO2 is an example of a
reactant.
product.
chemical equation.
chemical progression.
What is the number “4” in SiCl4?
a subscript
a coefficient
a product
a reactant
Which symbol in a chemical equation separates the reactants from the products?
=
→
>
+
30 grams of lead oxide and 15 grams of ammonia react completely to produce solid lead, nitrogen gas, and liquid water. What will be approximate mass of all three products?
10 g
15 g
45 g
450 g
Which best represents the law of conservation of mass?
mass of reactants > mass of products
mass of reactants < mass of products
mass of reactants = mass of products
mass of reactants → mass of products
