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23 questions
A green powder is heated & a gas is given off while it turns to a black solid. This describes
Physical Change
Chemical Change
Change in State
Change in Temperature
A Chemical Change is also known as what?
Physical Change
Physical Property
Chemical Reaction
Chemical Property
Which of the following could indicate that a chemical change took place?
Change in color
Production of Energy
Formation of Gas
All are correct
The formation of a solid when two liquids combine is called?
Solidification
Freezing
Precipitate
Solubility
The difference between a Physical change and a Chemical change is…
Physical change is only a change to the outside appearance.
Chemical change is when matter is changed into something new.
Atoms are rearranged in chemical changes & not in physical.
All are correct.
What does a chemical change result in?
A change in state of the substance (ex. liquid to solid)
A change in texture of the substance.
A change in the way atoms are bonded to each other.
A change in the appearance of the substance.
Which type of change is most often easily reversed?
Chemical
Physical
Both a physical and chemical change.
Neither a physical or chemical change.
Alex saw a rusty old car in an abandoned lot. Because he had recently read about chemical reactions, he began to wonder how the rust formed. What happened to cause the rust on the steel car?
A physical change took place in the steel of the car to form rust.
Oxygen in the air reacted with the paint on the car and formed rust.
Oxygen in the air chemically combined with the iron in the steel to form rust.
A decomposition chemical reaction took place when the iron in the steel mixed with oxygen to form rust.
Identify what type of change happening in the picture below...
Chemical Change
Physical Change
Endothermic Reaction
Exothermic Reaction
Identify what type of change happening in the picture below...
Chemical Change
Physical Change
Endothermic Reaction
Exothermic Reaction
Identify what type of change happening in the picture below...
Chemical Reaction
Physical Change
Change in State
Change in appearance only
Will made toast and buttered it, but then he left the butter out on the warm stove. What kind of change would most likely take place with the butter?
Chemical
Physical
Liquid
Solid
Macy has been studying physical and chemical reactions in school. She read about chemical reactions and how energy is either required or released during chemical reactions. Which word describes the direction of heat flow illustrated in the picture?
Chemical
Endothermic
Exothermic
Physical
If the chemical properties of a substance remain unchanged & the appearance or shape of an substance changes it is a...
Chemical Change
Physical Change
Both a physical and chemical change.
Neither a physical or chemical change.
Which of the following is an example of a physical change?
A glass falling and shattering on the floor.
Baking a birthday cake.
Burning a piece of paper.
Baking soda and vinegar mixing together.
Which is not a clue that could indicate a chemical change has occurred?
Change in color
Change in shape
Release of energy
Formation of an odor
During Chemical Reactions, the new substances created are called?
Precipitate
Corrosion
Reactants
Products
During Chemical Reactions, the substances that are used are called?
Precipitate
Corrosion
Reactants
Products
Which of these examples is a physical change?
Sugar dissolves in warm water
Physical change
Chemical Change
True or False: All atoms are created or destroyed in a chemical reaction.
true
false
maybe
Choose the words that correctly complete the sentences.
After having studied chemical reactions in school, Jose knew that when oxygen and hydrogen gases combine in the correct amounts, the combination yields a new substance, water. The hydrogen and oxygen are (products / reactants / synthetics / polymers) while the water is the (product / reactant / synthetic / polymer).
products, reactant
reactants, synthetic
polymers, synthetic
reactants, product
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