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- 1. Multiple Choice
Tim is testing how the amount of sugar dissolved in water affect the mixture's density. Which statement best represents a hypothesis for Tim's investigation.
The greater the amount of sugar in the, the more dense the mixture
The warmer the water, the faster the sugar will dissolve.
Sugar water is more dense than regular water.
Sugar increases the density of water more than salt.
- 2. Multiple Choice
A group of students are given three different-colored circles to make an atomic model of a carbon atom. The chart shows the the colored circle that represents each particle in the atom. Which diagram represents the correct atomic model for a carbon atom?
- 3. Multiple Choice
Which model accurately shows the charges and relative sizes of the subatomic particles that compose an atom.
- 4. Multiple Choice
The image shows an incomplete model of an atom. What particles should be placed inside the nucleus?
protons only
electrons only
electrons and protons
neutrons and protons
- 5. Multiple Choice
Sulfur is a light yellow solid that is dull and brittle. What can be inferred about sulfur based upon this information?
its a metal
it is a nonmetal
it is a compound
it is a mixture
- 6. Multiple Choice
Which statement describes a chemical property?
Steel is shaped into automobile fenders.
Water begins to boil when it reaches 100C.
Oil floats on water because it is less dense.
Iron slowly forms rust when exposed to oxygen gas.
- 7. Multiple Choice
Which example describes a chemical property?
Zinc and hydrochloric acid react to produce hydrogen gas.
Helium-filled balloons float because helium is less dense than air.
White sugar crystals become colorless when dissolved in hot water.
Tungsten has a high melting point, so it is used in making light bulb filaments.
- 8. Multiple Choice
Which property is generally characteristics of solid nonmetallic elements?
brittle
good conductor
luster
high density
- 9. Multiple Choice
A students places a small stone with a mass of 5 g into a graduated cylinder containing 50 ml of water. With the stone in the graduated cylinder, the water rises to 75ml. What is the density of the stone?
0.07 g/mL
0.20 g/mL
5.00 g/mL
125.00 g/mL
- 10. Multiple Choice
Examine the equation. Density=Mass/Volume What is the density of an object with a mass of 20 g and volume 10cm3?
0.5 g/cm3
2.0 g/cm3
10.0 g/cm3
200.0 g/cm3
- 11. Multiple Choice
A students labels four rectangular blocks of different sizes that are composed of different materials (1, 2, 3, and 4). He places each block on a triple beam balance its mass and the calculates the volume of each block by measuring the lengths of its sides. The student records the mass and volume of each block in a table. Based on the data, what can be concluded about the density of the blocks?
Block 4 is denser than Block 2.
Block 1 is denser than Block 3.
Block 1 is denser than Block 4.
block 3 is denser than Block 2.
- 12. Multiple Choice
Which pair of listed properties correctly describes most acids?
They contain hydrogen ions (H+) and have a bitter taste
They contain hydrogen ions (H+) and have a sour taste.
They contain hydroxide ions (OH-) and have a bitter taste.
They contain hydroxide ions (OH-) and have a sour taste.
- 13. Multiple Choice
What compounds are often formed from a reaction between an acid and a base?
a metal and a non-metal
a salt and water
proteins and fats
sugars and starches
- 14. Multiple Choice
Which statement is true about acids?
They feel slippery.
They taste sour.
They turn red litmus paper blue.
They turn phenolphthalein bright pink.
- 15. Multiple Choice
What tool should be used to determine the strength of an acid or base?
blue litmus paper
red litmus paper
pH paper
phenolphthalein solution
- 16. Multiple Choice
An unknown substance was found to be a base. What evidence must have been collected?
It tasted sour.
It had a pH of 5.
When touched, it had a slippery feel.
When phenolphthalein was added, it stayed colorless.
- 17. Multiple Choice
A reaction occurs in a breaker of fluid, and a white substance settles to the bottom. This precipitate is evidence that what process has occurred?
chemical reaction
gas exchange
heat exchange
physical change
- 18. Multiple Choice
Which process best illustrates elements combining to make a new compound?
melting a solid to make a liquid
boiling a liquid to make steam
cutting a solid to make more parts
mixing two liquids to make a solid
- 19. Multiple Choice
Which example represents an entirely physical change?
Black iron turns to reddish-brown when it rusts.
Water boils which creates bubbles and water vapor.
Wood burns to produce ashes and gases.
Carbon dioxide combines with limewater to produce chalk.
- 20. Multiple Choice
What would the breaking up of a large rock into small rocks be considered?
chemical property
chemical reaction
physical change
physical property
- 21. Multiple Choice
Which is the least likely indicator that a chemical change has taken place in a substance?
change in color
change in state of matter
formation of gas bubbles
formation of a precipitate
- 22. Multiple Choice
How is the Law of Conservation of Matter best represented in a chemical reaction?
The mass of the products is greater than the mass of the reactants.
The mass of the reactants is greater than the mass of the products.
The mass of the reactants is equivalent to the mass of the products.
The mass of the reactants has no relationship to the mass of the products.
- 23. Multiple Choice
An object is placed in graduated cylinder containing 15 mL of water, and the water rises to 30 mL. if the mass of the object is 54 g. What is the density of the object?
0.3 g/mL
1.2 g/mL
1.8 g/mL
3.6 g/mL
- 24. Multiple Choice
The mass of chemical A is 2 g and the mass of chemical B is 5 g. If the two chemicals are mixed and a chemical reaction takes place, what is the mass of the end products?
2 g
3 g
7 g
10 g
- 25. Multiple Choice
Which chemical equation supports the Law of Conservation of Matter?
2H + O2 → 2H2O
H2 + O2 → H2O
H2 + O2 → 2H2O
2H2 + O2 → 2H2O
- 26. Multiple Choice
When hydrochloric acid (HCl) is added to sodium bicarbonate (NaHCO3), it produces salt (NaCl), water (H2O), and carbon dioxide (CO2). A student wants to demonstrate this reaction in a science class. With the help of her science teacher, the student weighs out precisely 15 g of NaHCO3 and 15 g of HCl. Then, the student adds all of the NaHCO3 to the HCl. After the two substances react, the student carefully weighs the final remaining contents of the beaker. Since the final contents weigh 29 g, the student concludes that the reaction violated the Law of Conservation of Mass.
Which alternate explanation is more likely?
1 gram of carbon dioxide gas escaped into the air, so there was no violation of the Law of Conservation of Mass.
1 gram of carbon dioxide gas escaped into the air, so there was a partial violation of the Law of Conservation of Mass.
Some of the NaHCO3 disappeared when it dissolved into the HCl, and this accounts for the missing 1 gram of mass.
Some of the HCl vaporized into the air when the NaHCO3 was added to it, and this accounts for the missing 1 gram of mass.
- 27. Multiple Choice
A chemical reaction in which all of the reactants and products are gases takes place in a closed system. How would the chemical equation for that reaction be described?
The mass of the product gases is equal to the mass of the reactant gases.
The mass of the product gases is greater than the mass of the reactant gases.
The mass of the reactant and product gases will vary with the temperature.
The mass of the reactant gases is greater than the mass of the product gases.
- 28. Multiple Choice
A student is making a table to describe the charges of the subatomic particles in an atom. What charge should be placed in the table for an electron?
-1
0
+1
+2
- 29. Multiple Choice
A student makes a drawing to show the position of an electron inside an atomic model. Which model correctly shows the possible position of an electron in the model?
- 30. Multiple Choice
Nate observes the physical and chemical properties of a block of zinc. The chart lists five questions Nate wants to explore by testing the block of zinc.
Which safety guideline should Nate follow before he begins his tests?
Measure the mass and volume of the block several times.
Test a known metal and nonmetal during his investigation to use as controls.
Wear gloves and goggles, and use caution when handling chemicals
Use a graduated cylinder and ruler, and wear goggles to measure the density
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