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WorksheetsIQWST IC2 Review
Total questions: 57
Worksheet time: 43mins
A chemical reaction occurs when Kelly combines carbon dioxide (CO2) and water (H2O) together.
CO2 + H2O → H2CO3 ?
What is the product of the reaction?
H2O2 + CO2
H2CO3
H3CO2
H2O + CO2
What best explains why electrolysis is a chemical reaction?
Electrolysis is a chemical reaction because it makes two new substances identical to water.
Electrolysis rearranges the atoms of water into two new substances with different properties than water.
Electrolysis boils water until the water vapor turns into new susbtances.
True or false: Electrolysis is a CHEMICAL reaction
True
False
A chemical reaction occurs when Kelly puts carbon dioxide (CO2) and water (H2O) together.
H2O + CO2 → H2CO3 ?
What are the reactants?
H2O2 + CO2
H2CO3
H3CO2
H2O + CO2
What could be considered EVIDENCE of a chemical reaction? CHOOSE ALL THAT APPLY
Formation of bubbles
Change in color
Production of gas
Temperature change
What is the arrow in a chemical equation...
H2 + O --> H2O
Reactants
Products
Yields/Forms/Produces
Chemical Equation
What are Chemical Reactions?
It's when you mix substances.
a process in which atoms rearrange to form new substances
bubbles
letter and numbers showing the types and number of atoms
Pat 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 Pat succeed in creating a chemical change?
Yes, because the oil was evenly suspended.
Yes, because the solution was permanently changed.
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?
heat was released from the copper
an increase in energy
a chemical reaction
a change in shape
Which of the following is a chemical reaction?
New atoms are formed when substances are mixed together
A solid material melts and becomes a liquid
Atoms of the reactants rearrange to form a new substance
A student dissolves 3 gram of sugar in 10 grams of water. She then determines the mass of the solution. What is the mass of the dissolved sugar and water?
13 grams because the substance is a mixture and the molecules are floating next to each other.
13 grams because a chemical reaction occurred making a new substance.
Less then 13 grams because the water absorbed the sugar.
More than 13 grams because the sugar absorbed the water.
Which of the following is true about the principle of the conservation of mass?
The mass of the products is never equal to the mass of the reactants.
The mass of the products is less than the mass of the reactants.
The mass of the products is equal to the mass of the reactants.
The mass of the products is greater than the mass of the reactants
Jay had two clear liquids in bottles. The mass of one liquid was 10.0 grams and the other was 7.0 grams. When he mixed them, a yellow solid formed and settled to the bottom of the bottle. He predicted that the liquid plus the solid would have more mass, so he put the bottle on a scale. The mass was 17.0 grams.
Why did the mass not change?
Because it is a mixture and mass doesn't change.
His scale is broken.
Do to the Law of conservation of mass, matter cannot be created nor destroyed so the mass is the same as the reactant and the product.
He forgot to tare his bottle and the scale had the mass of the bottle added in.
Which statement is always true about conservation of matter?
If a gas forms, the mass of a system decreases.
The mass of a system does not change during a chemical reaction.
If a solid forms, the mass of a system increases.
The mass of a system changes when a substance changes from liquid to gas, but it does not change in a chemical reaction.
In the equation
magnesium + oxygen 🡪 magnesium oxide, Magnesium + oxygen is the reactant?
true
false
In the equation
magnesium + oxygen 🡪 magnesium oxide, magnesium oxide is the product?
true
fale
True or false: electrolysis is a CHEMICAL reaction
True
False
What would help keep your eyes safe when cutting an onion?
Coating the knife in water or oil will keep it from breaking open onion cells and releasing acid vapor.
Chewing gum while cutting an onion will make your mouth water, taking water away from the reaction between onions and your eyes.
Goggles are so dorky, the onions won't want to talk to you.
Wearing goggles to keep the acidic vapor from the onion from reacting to the water in your eyes.
Which statement is true about matter?
It has mass and takes up space.
It is always a substance.
It has mass and is usually a liquid.
It is soluble.
A single kind of matter that is pure, meaning it has a specific makeup or composition is called a mixture.
True
False
A single kind of matter that is pure, meaning it has a specific makeup, or composition is a _________.
substance
compound
property
gas
A substance that dissolves_____.
disappears forever
breaks into pieces that are too small to be seen
evaporates
is destroyed
Is color a property?
Yes, a property
No, not a property
Is mass a property?
Yes, a property
No, not a property
Is volume a property?
Yes, a property
No, not a property
Is shape a property? (eg., round, or tall)
Yes, a property
No, not a property
Is solubility a property?
Yes, a property
No, not a property
Is melting point a property?
Yes, a property
No, not a property
Is density a property?
Yes, a property
No, not a property
If a characteristic changes when I have more or less of a substance, is it a property?
Yes, a property
No, not a property
If a characteristic stays the same when I have more or less of a substance, is it a property?
Yes, a property
No, not a property
A substance is:
made of more than one substance (or more than one type of atoms or molecule)
made of only one type of material (atoms or molecules) all the way through
a unique characteristic that helps identify a substance and distinguish one substance from another
A mixture is:
a unique characteristic that helps identify a substance and distinguish one substance from another
made of only one type of material (atoms or molecules) all the way through
made of more than one substance (or more than one type of atom or molecule)
Which is an example of a mixture?
24k Gold
Chalk
Drinking water
Pepperoni Pizza
Cake batter is a substance that may contain flour, eggs and sugars mixed by hand or with an electric mixer. Cake batter is a ___________________ .
pure substance
mixture
Methane contains one atom of carbon and four atoms of hydrogen that are chemically bonded. It is a main component of natural gas. Methane is a ___________________ .
pure substance
mixture
