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WorksheetsObjective Quiz #3
Total questions: 10
Worksheet time: 55mins
A student measures out 100mL of two different clear liquids and then pours one into the other. The mixture, which has a volume of 200mL, turns bright red, then begins to become quite cold. In this process, the first evidence that a new substance had formed was observed when the -
Student measured the liquids
Volume was seen to be 200 mL
color changed bright red
Temperatrue of the mixture decreased
Four mixtures are made by combining two clear liquids and observation are made. Which results indicate that a new substance has formed?
Mixture 1: The combined liquids have a greater mass than either of the starting liquids.
Mixture 2: The liquids, when mixed, produce a white solid which settles to the bottom.
Mixture 3: The mixture of the two liquids takes the shape of the container they are in.
Mixture 4: The denser of the two liquids lies below the other, less dense, liquid.
The table records the observation that result from four different combinations. Which combination of substances shows evidence that a new substance was formed?
Baking soda and vinegar
Sodium chloride and water
Oil and water
Iron fillings and sand
Students combine several chemicals and record the observation in their science notebooks. A list of the observed results is given here. "Production of Gas (bubbles), Phase change (solid to liquid), A precipate forms, (Change in shape), Crystals dissolving, Heat Produced.
How many of the observations are evidence that a new substance was formed?
3
4
5
6
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 tablets dissolve in water.
The water becomes cloudy.
The water level increases slightly.
Bubbles are given off.
If we have any substance, it can be concluded that a chemical change has happened if -
There is a color change.
The state of matter changes.
There is a decrease in mass.
The matter is stirred thoroughly.
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 dissolved in a liquid
Four substances were mized with a clear liquid. The observations are recorded in the following table. Based on the observations, for which mixtures is there the best evidence that a new substance was formed.
Substance 1
Substance 2
Substance 3
Substance 4
A student notices that sugar, when heated over a flame, turns black. How does that 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.
