WorksheetsFormation of a New Substance
Total questions: 25
Worksheet time: 25mins
Which of the following situations provides evidence that a chemical change has taken place?
Water, when boiled, evaporates and turns into vapor.
Sugar, when added to iced tea, dissolves into the liquid.
Two liquids are mixed, and a new solid substance (a precipitate) forms.
A piece of paper is cut into many small pieces.
Which of the following would indicate the formation of a new substance?
A liquid turns to a solid
A sample of metal melts
Bubbles and fizzing occur
A solid dissolves in a liquid
Which is an example of a different substance being formed?
glass breaking
metal melting
water freezing
wood burning
A chemical change always results in the formation of a:
explosion
big mess
new substance
new state of matter
A company that makes frying pans needs to create a new substance to coat the pans. The substance must have a high melting point. To create this new substance, workers mixed together two substances that melt at low temperatures in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.
After mixing, the workers found two substances that melt at higher temperatures in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?
A
B
C
D
The question on the test says: "Explain if the model correctly shows why a chemical reaction can result in a molecule with different properties."
The student wrote: "This is not a correct model because we have hydrogen (H) and oxygen (O) on one side but water (H20) on the other side."
Is the student correct?
Correct, atoms cannot be rearranged to form new molecules
Incorrect, during a chemical reaction, atoms are rearranged and can form new molecules
Incorrect, the H and O atoms are destroyed. Then H2O atoms are created.
Incorrect, two gases cannot create a liquid during a chemical reaction.
Which processes above can be used as evidence to identify the formation of a new substance?
Processes A, B, C, and D
Processes B, C, E, and F
Processes B, C, D, and F
Processes C, D, E, and F
Substances were mixed with a clear liquid. Based on the observations on the chart, for which mixture is there the best evidence that a new substance was formed?
Substance 1
Substance 2
Substance 3
Substance 4
The table records the observations that result from four different combinations. Which combination of substances shows evidence that a new substance was formed?
Combination of oil and water
Combination of salt and water
Combination of baking soda and vinegar
Combination of iron filings and sand
Which is the best example of a new substance forming?
lighting a match
cutting a piece of paper
popping a balloon
hitting a nail with a hammer
a new substance formed in a chemical reaction
reactants
products
The image shows what happens when cold medicine tablets are placed in room-temperature water. What evidence would indicate that a new substance is produced?
The water changes color
The tablet dissolves
Bubbles are formed
The water temperature increases
A new substance formed
Physical
Chemical
Four students performed four different investigations by combining different substances. Their results are shown in the table provided. In which experiment are new substances being formed?
Experiment 1
Experiment 2
Experiment 3
Experiment 4
When atoms bond it is called a ___________________ because they make a new substance.
chemical reaction
physical reaction
New substance created
Chemical
Physical
Spoiling food is an example of:
chemical change
physical change
no change
Baking a cake
Chemical
Physical
Which of the following situations provides evidence that a chemical change has taken place?
Water, when boiled, evaporates and turns into vapor.
Sugar, when added to iced tea, dissolves into the liquid.
Two liquids are mixed, and a solid substance forms.
A piece of paper is cut into many small pieces.
Which of the following would indicate the formation of a new substance?
A liquid turns to a solid.
A sample of metal melts.
Bubbles and fizzing occur.
A solid dissolves in a liquid.
A student notices that sugar, when heated over a flame, turns black. How does the student know that a new substance is being formed?
The temperature of the sugar increases.
The color of the sugar changes to black.
Sugar began to melt within the test tube.
Sugar started as white crystals.
Chemical Reaction
a substance formed as a result of a chemical reaction
a change in matter that produces one or more new substances
the process in which substances undergo chemical changes that result in the formation of new substances
a substance that enters into a chemical reaction
Which of the following is a clear indication of a chemical change resulting in the formation of a new substance?
A metal rod is bent into a new shape.
A piece of ice melts into water.
A piece of iron rusts over time.
A glass cup shatters into pieces.
During an experiment, a student mixes two clear solutions and observes the formation of a yellow solid. What does this observation most likely indicate?
A physical change has occurred.
A new substance has been formed.
The solutions have evaporated.
The solutions have frozen.
Which process is an example of a chemical change where a new substance is formed?
Boiling water to produce steam.
Mixing sand and salt.
Burning a piece of wood.
Dissolving sugar in water.
