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WorksheetsUnit 1 Retest
Total questions: 13
Worksheet time: 5hrs 32mins
Priya went with her aunt to watch a fireworks display. She asked her aunt why fireworks react the way they do. Her aunt explained that it is due to a chemical change, and that there are indicators to look for. What evidence is there of a chemical change in the fireworks? Select THREE answers
A. Size change
B. Temperature change
C. Location change
D. Light production
E. Color change
Which substance listed in the chart is made up of the most atoms?
Carbonic Acid
Nitric Acid
Phosphoric Acid
Sulfuric Acid
An experiment was performed in which a crystalline substance was added to a beaker filled with a liquid at room temperature. The observations made during the experiment are listed below. All of the observations are evidence that a chemical change occurred EXCEPT -
the crystals dissolved.
a precipitate formed.
the bottom of the beaker felt warm to the touch.
bubbles formed in the water.
Image A and image B show two different substances. Which of the following statements accurately describe the two substances? Choose TWO correct responses.
A. Images A and B are both composed of carbon and oxygen.
B. Images A and B are both molecules containing 2 atoms of oxygen.
C. Images A and B are both compounds containing 2 atoms of oxygen.
D. Image A is an element and image B is a compound.
E. Image A is a compound and image B is an element.
An antacid is a medication that is used to help calm heartburn. Some antacid tablets contain two compounds that dissolve when the tablet is placed in water. When these compounds dissolve into solution, they react and form two different compounds, one of which is carbon dioxide (CO₂) gas. Select THREE answers.
In this reaction, the antacid tablet is the ___ that dissolves into the ___ water. This tablet dissolving is a ___ change.
solute
solution
solvent
chemical
physical
How many atoms of oxygen are in the chemical formula below? Mg₃(PO₄)₂ {multiply}
2
4
6
8
A glass of lemonade with ice in it sits outside in the Texas summer heat. Before long the ice begins to melt. Which of the following has occurred. Select TWO correct responses.
The ice has melted, which is a chemical change.
The ice has melted, which is a physical change.
The lemonade has been diluted by the water from the melting ice.
The water from the melting ice has been diluted by the lemonade.
The water from the melting ice has had no effect on the lemonade.
Which labels best complete the diagram?
A. 1 = solution 2 = solvent, 3 = solute
B. 1 = solute 2 = solvent, 3 = solution
C. 1 = solvent 2 = solute, 3 = solution
D. 1 = solution 2 = solute, 3 = solvent
The chemical formula for a molecule must include two or more different kinds of atoms.
True
False
Which of these is an element?
O2 molecules
P2O5 molecules
Molecules composed of more than one type of atom
In an experiment, students were given the task of dissolving NaCl in water to create aqueous solutions. Based on each student's experiment setup, which student completed the task fastest?
Student 1
Student 2
Student 3
Student 4
Jasper adds a powdered drink mix to a glass of water and sets it on the table. His friend Shelley adds the same amount to her glass and stirs it with a spoon. Shelley's will dissolve faster because
agitation decreases the number of collisions between the solute and solvent
agitation increases the surface area
agitation increases the number of collisions between the solute and solvent
agitation changes the solvent into a gas
During an investigation, a student combined two clear, colorless solutions. The student observed that the temperature changed 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?
One of the original compounds came out of solution
A chemical change occurred
Some of the water froze into ice crystals
Evaporation occurred, leaving a solid
