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Q 1/17
Score 0
Which of the following correctly identifies a precipitate in a chemical reaction?
30
Two substances are separated using an electrical current
Two substances react in solution, forming a new substance which is a solid
A substance decreases in volume
Water condenses to form rain
Q 2/17
Score 0
Which of the following identifies a chemical change?
30
A piece of paper burning
A piece of paper being cut in half
A piece of paper being folded and unfolded
17 questions
Q.
Which of the following correctly identifies a precipitate in a chemical reaction?
1
30 sec
Q.
Which of the following identifies a chemical change?
2
30 sec
Q.
An experiment was performed and the observations are listed. Which substance showed a chemical change?
3
30 sec
Q.
The elements sodium (Na) and chlorine (Cl) combine to form sodium chloride (NaCl). What must happen for NaCl to form? Use the information below and your knowledge of science to answer the question.
4
60 sec
Q.
A group of students conducted an experiment where they combine different substances together and record their observations which result from the combination.
Use the information below and your knowledge of science to answer the question.
What combination of substances shows the sign of a chemical change?
5
60 sec
Q.
Which of these is an example of a chemical change?
6
30 sec
Q.
What type of change is occurring in the picture below?
7
30 sec
Q.
During a chemical change, -
8
30 sec
Q.
The teacher sets a marshmallow on fire. The marshmallow begins to turn black and release carbon dioxide gas. This is because –
9
60 sec
Q.
A scientist spilled a couple of drops of dilute hydrocholric acid on a lab table. For safety purposes, scientists spilled some baking soda onto the spill. What observation would provide the best evidence of a chemical reaction?
10
60 sec
Q.
Which of the following is NOT a chemical change
11
30 sec
Q.
Which table correctly identifies the changes taking place in the table?
12
60 sec
Q.
The student observed that the temperature changed from 25 degrees to 23 degrees Celsius when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?
13
60 sec
Q.
A student puts two different solutions into a test tube. When the substances touch each other a white substance forms that sinks to the bottom of the test tube. What kind of chemical change occurred?
14
60 sec
Q.
A nail sat outside for a year and it started to rust. What evidence is there that a chemical change has occurred?
15
60 sec
Q.
Substance Q (a white liquid) and Substance R (a green liquid) were mixed together. The substances reacted and the new liquid turned bright purple. What evidence is there that a chemical change occurred?
16
60 sec
Q.
A teacher put a solid, powdery substance and a liquid together and then the student noticed that it started to bubble, foam and fizz due to the reaction. What evidence is there that a chemical change occurred?
