Font size
WorksheetsChemistry Unit Retest
Total questions: 18
Worksheet time: 10mins
In the experiment, the __________ tablet dissolved the fastest because it had the __________. Which terms best complete the sentence?
crushed; highest surface area
whole; lowest surface area
crushed; highest temperature
whole; highest surface area
quartered; lowest concentration
Which statement best describes the concentration of the solutions made from the dissolved vitamin C tablets?
The solution with the whole tablet has the highest concentration because the tablet was in one piece.
The solution with the crushed tablet has the lowest concentration because the tablet was in many pieces.
All three solutions had a concentration of zero because the tablets completely dissolved in the water.
All three solutions have the same concentrations because the amounts of water and solute were the same.
Which two experiments would examine ways to change the rate of dissolution?
Use crushed, quartered, and whole tablets with varying sizes.
Use a crushed, quartered, and whole tablet, and measure the amount of water evaporated following heating.
Use full tablets in each trial but use a different temperature of water for each container.
Use full tablets in each trial, but increase the amount of water used to dilute the Vitamin C tablet.
Use full tablets in each trial and stir each tablet a different number of times when dissolving.
Image A and image B show two different substances. Which of the following statements accurately describe the two substances? Choose two answers.
Images A and B are both composed of carbon and oxygen.
Images A and B are both molecules containing 2 atoms of oxygen.
Images A and B are both compounds containing only 2 atoms of oxygen.
Image A is an element and image B is a compound.
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 with each other and form two different compounds, one of which is carbon dioxide (CO₂) gas. The person then drinks the dissolved solution. This type of antacid tablet is a __________ that dissolves into the _______, water. This is a __________ change. Once in solution, the __________ react to form a gas which is evidence of a __________ change. Which terms best complete the sentences?
molecule; solute; chemical; solvents; physical
solvent; solute; chemical; molecules; physical
solute; molecule; chemical; solvents; physical
solvent; solute; physical; molecules; chemical
solute; solvent; physical; molecules; chemical
Compare the four solutions in the diagram in terms of the amount of solute and the volume of the solutions. Solution ________ is the most concentrated solution. Solution ________ is the most diluted solution. Solution B has the same concentration as solution ________. Which order of letters accurately completes the sentences?
A. B; A; C
B. A; D; C
C. D; A; C
D. B; C; A
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 answers.
A. The ice has melted, which is a chemical change.
B. The ice has melted, which is a physical change.
C. The lemonade has been diluted by the water from the melting ice.
D. The water from the melting ice has been diluted by the lemonade.
E. The water from the melting ice has not diluted the lemonade.
The chemical formulas of three substances are recorded. - C₃H₈O - C₄H₁₀O - C₅H₁₂O These compounds contain the same __________ because each formula has the same __________. They are different compounds because they have different __________. Which terms best complete the sentences?
molecules; chemical formulas; chemical symbols, atoms
elements; chemical formulas; chemical symbols, elements
molecules; chemical symbols; chemical formulas, elements
elements; chemical symbols; chemical formulas, atoms
A student wants to test how temperature affects the speed a solute dissolves in an aqueous solution. The student plans to conduct three trials of the same solute and solvent. The table shows the three trials the student will conduct.
As the temperature increases, the solute will dissolve slower into the solution.
As the temperature increases, the solute will not dissolve into the solution.
As the temperature increases, the solute will dissolve faster into the solution.
As the time to dissolve increases, the speed at which the solute dissolves will not change.
Glucose is a simple sugar with the molecular formula C₆H₁₂O₆. It contains elements that can be found in the Periodic Table. Which option correctly identifies the type and number of each atom found in glucose?
Glucose contains 24 atoms of carbon, 24 atoms of hydrogen, and 24 atoms of oxygen.
Glucose contains 6 atoms of carbon, 12 atoms of hydrogen, and 6 atoms of oxygen.
Glucose contains 6 atoms of carbon and 18 atoms of holmium.
Glucose contains 12 atoms of cobalt and 12 atoms of hydrogen.
Erika is making a saltwater solution to remove ice from her driveway. She pours salt into a big bucket of water, but most of it sinks to the bottom. What is the simplest way to get the salt to dissolve?
Heat the water so the salt dissolves and then cool it back down again.
Crush the granules of salt into a finer powder.
Add ice to cool the salt even more so the salt dissolves.
Stir the solution with a stick so the salt will dissolve.
In an experiment, students were given the task of dissolving NaCl in water to create aqueous solutions. Student 1 dissolved whole NaCl tablets in 20°C water. Student 2 dissolved crushed NaCl tablets in 20°C water. Student 3 dissolved crushed NaCl tablets in 30°C water. Student 4 dissolved whole NaCl tablets in 10°C water and stirred the mixture. Based on each student’s experimental setup, which student completed the task fastest?
Student 1 because the tablets had the lowest surface area.
Student 2 because the tablets had the highest surface area.
Student 3 because the tablets had the highest surface area and temperature.
Student 4 because the tablets had the lowest surface area and temperature.
Each of these options is either an element or a compound. Which are elements? Select all correct answers.
A molecule with two oxygen atoms
An atom of Krypton
A molecule with two phosphorus atoms and five oxygen atoms
A molecule composed of one type of atom
A molecule composed of more than one type of atom
Look at the image. Which labels best complete this diagram?
1 = solution, 2 = solvent, 3 = solute
1 = solute, 2 = solvent, 3 = solution
1 = solvent, 2 = solute, 3 = solution
1 = solution, 2 = solute, 3 = solvent
To decrease the rate of dissolution of a solute, ____________ the temperature, ____________ the agitation of the solution, and ____________ the surface area of the solute. Which terms, in order of appearance, best complete the sentences?
decrease; decrease; decrease
increase; decrease; increase
decrease; increase; decrease
increase; increase; increase
What is a change in the size, shape, or state of matter that does NOT change it into a new kind of matter?
energy
chemical change
physical change
energy transformation
