01.01-01.06 For Chem Dba

If an object has a density of 4.2 g/mL, what is its density in hg/L? A. 0.0042 hg/L B. 0.042 hg/L C. 42 hg/L D. 4,200 hg/L

0.0042hg/L

Match the term to its description. Term 1) Chemical Energy 2) Electrical Energy 3) Radiant Energy 4) Thermal Energy Definition A) Potential energy stored in the bonds between atoms B) Electromagnetic energy that travels in waves C) The movement of an electrical charge D) Internal energy caused by vibrations of atoms and molecules

1) A 2) C 3) B 4) D

If a swimming pool contains 2,850 kiloliters (kL) of water, how many gallons (gal) of water does it contain?(1 gal = 3.785 L) A. 7,530 gal B. 10,800 gal C. 753,000 gal D. 10,800,000 gal

C. 753,000 gal

Which of the following is an example of a physical change? A. Burning a piece of wood B. Cooking a hamburger C. Evaporating rubbing alcohol D. Rusting iron

C. Evaporating rubbing alcohol

What volume is equivalent to 0.0015 m3? A. 1.5 x 10‒5 cm3 B. 1.5 x 10‒3 cm3 C. 1.5 x 104 mm3 D. 1.5 x 106 mm3

D. 1.5 x 106 mm3

Which of the following is a valid conversion factor? A. 1000mL/1L B. 1hm/1000m C. 1cm^3/1L D. 1000cg/1g

1000mL/1L

25,000 cg is equal to ____ g. (Only input whole number answer.)

250

The meter is the SI unit for length. A. True B. False

A. true

During an experiment, it is observed that iron powder sinks in water and sulfur powder floats in water. What will most likely be observed when sulfur powder and iron powder are mixed together and then added to water? A. Sulfur will float and iron will sink because each will retain its properties. B. Iron will float and sulfur will sink because each will lose its properties. C. Both will float because they are physically mixed. D. Both will float because they react chemically.

A. Sulfur will float and iron will sink because each will retain its properties.

Which of the following correctly describes a compound? A. The atoms are bonded together, and the compound has different physical and chemical properties than the individual elements. B. The atoms have no set ratio for how the atoms can combine, and they are not chemically bonded together. C. The atoms can only combine in fixed ratios, and they retain their individual chemical and physical properties. D. The atoms retain their individual chemical properties, and they can only be separated from each other by a chemical change.

A. The atoms are bonded together, and the compound has different physical and chemical properties than the individual elements

Rubbing alcohol evaporates from your arm quickly, leaving a cooling effect on your skin. How do the molecules of gas compare to the molecules as a liquid? A. The gas particles move faster, have the same molecular composition, and have weaker attractions between them than the liquid particles. B. The gas particles move faster than the liquid particles, and the bonds of the molecules are broken during evaporation to allow gas atoms to spread apart. C. The gas particles move slower but have the same molecular structure and the same attraction between them as the liquid particles. D. The gas and liquid particles move at the same speed, but the bonds of the molecules are broken during evaporation to allow the gas atoms to spread apart.

A. The gas particles move faster, have the same molecular composition, and have weaker attractions between them than the liquid particles.

Density is an intensive physical property because the density of a given substance does not change with the size of the sample. A. True B. False

A. True

If a question is testable and can provide an answer based on empirical observations and reasonable logic, it can be answered with science. A. true B. false

A. true

Four properties of water are listed. 1) It is colorless and odorless in its pure form. 2)It reacts with metals to form metal hydroxide and hydrogen gas. 3)When heated to 100 °C, water evaporates. 4)It decomposes to form hydrogen and oxygen. Which are the physical properties of water? A. 1 and 2 B. 1 and 3 C. 2 and 3 D. 3 and 4

B. 1 and 3

Which of the following is a sign a chemical reaction has occurred? A. A blue liquid is mixed into a yellow liquid, and the mixture turns green. B. A piece of metal is placed in water and produces sparks and gas. C. A liquid is heated on a hotplate, and bubbles form. D. A solid powder is mixed into a liquid and disappears.

B. A piece of metal is placed in water and produces sparks and gas.

Yasir wants to determine if there is a relationship between room color and sleep. Based on his research, Yasir makes an educated guess that people fall asleep more quickly in a room painted blue than in a room painted yellow. He asks several people which color they like better—yellow or blue—and uses their responses to determine if his educated guess was correct. What is missing from Yasir's scientific investigation? A. A testable hypothesis that is based on research B. An experiment that directly tests the hypothesis C. Variables to be tested by an experiment D. Research on the topic to see what others have learned

B. An experiment that directly tests the hypothesis

Water is an example of a mixture because it is made up of hydrogen and oxygen atoms bonded together. A. True B. False

B. False

Which of the following could be a scientific statement? A. I believe there is life on other planets B. I observed that bees prefer red flowers C. I think that cake tastes better than cookies D. I consider yellow a joyful color

B. I observed that bees prefer red flowers

What best explains the type of energy present in natural gas? A. It is chemical energy, which is a type of kinetic energy. B. It is chemical energy, which is a type of potential energy. C. It is mechanical energy, which is a type of kinetic energy. D. It is mechanical energy, which is a type of potential energy.

B. It is chemical energy, which is a type of potential energy.

What is generally true about the compressibility of solids? A. It is higher than the compressibility of gases and liquids. B. It is lower than the compressibility of plasmas and gases. C. It is higher than the compressibility of plasmas, but not of other phases. D. It is lower than the compressibility of liquids, but not of other phases.

B. It is lower than the compressibility of plasmas and gases.

A scientist conducts an experiment to determine how the CO2 levels in ocean water affect the number of plants that can grow in the ocean. What is the dependent variable? A. CO2 level B. Number of plants C. Plant height D. Types of plants

B. Number of plants

Which of the following is not a characteristic of reliable science? A. Controlled variables B. Paid sponsorship by a company C. Repeated testing through multiple trials D. Replication by other scientists

B. Paid sponsorship by a company

Which of the following describes the characteristics of a plasma? A. Particles are packed closely together, have low compressibility, and usually maintain their organized, set shape. B. Particles are positively and negatively charged, have high compressibility, and spread out to fill a container. C. Particles move around in a semi-organized way, take the shape of a container, and fill a container from the bottom up. D. Particles move freely, have high compressibility, and spread out evenly to fill a container.

B. Particles are positively and negatively charged, have high compressibility, and spread out to fill a container.

What energy transfer is occurring when a plant uses energy from the sun to make sugar in fruit? A. Radiant energy is converted to nuclear energy. B. Radiant energy is converted to stored chemical energy. C. Thermal energy is converted to nuclear energy. D. Thermal energy is converted to stored chemical energy.

B. Radiant energy is converted to stored chemical energy.

A student describes the motion of particles in each of the four different states of matter. State 1: Particles that are charged move freely State 2: Particles move freely at high speed State 3: Particles are locked in place State 4: Particles slide past one another Which state describes gases? A. State 1 B. State 2 C. State 3 D. State 4

B. State 2

How does a sample of water at 38 °C compare to a sample of water at 295 K? A. The water at 38 °C has a lower average kinetic energy than the sample at 295 K. B. The water at 38 °C has faster-moving molecules than the sample at 295 K. C. The water at 38 °C has greater nuclear energy than the sample at 295 K. D. The water at 38 °C has larger molecules than the sample at 295 K.

B. The water at 38 °C has faster-moving molecules than the sample at 295 K

Temperature is a measure of the amount of heat in a substance. A. True B. False

B. false

A participant took 5.2 hours to complete a marathon. How many minutes did the participant take to complete the marathon? Use 1 hour = 60 minutes A. 11.5 minutes B. 33.8 minutes C. 312 minutes D. 322 minutes

C. 312 minutes

What is kinetic energy? A. The energy of change B. The energy of distance or volume C. The energy of motion D. The energy of position or composition

C. The energy of motion

Which statement is not true about the field of science? A. It is based on observations and explanations of the natural world. B. It is based on rational thinking, inquiry, and experimentation. C. It is consistent and does not need to change with new discoveries. D. It is replicable and tested by many scientists over time.

C.It is consistent and does not need to be changed with new discoveries

When salt dissolves in water, what type of substance is formed? A. A heterogeneous mixture, because the different components are mixed unevenly within the substance B. A heterogeneous mixture, because the different components are mixed evenly within the substance C. A homogeneous mixture, because the different components are mixed unevenly within the substance D. A homogeneous mixture, because the different components are mixed evenly within the substance

D. A homogeneous mixture, because the different components are mixed evenly within the substance

When heat energy is added, two changes are observed: Change A: Solid changes to a liquid. Change B: Solid changes directly to a gas. What are the names for phase changes A and B? A. A is freezing and B is condensation. B. A is freezing and B is sublimation. C. A is melting and B is condensation. D. A is melting and B is sublimation.

D. A is melting and B is sublimation.

What part of the scientific method involves drawing inferences about experimental results and determining if the collected data support the original hypothesis? A. Asking a question B. Conducting research C. Constructing a hypothesis D. Drawing conclusion

D. Drawing Conclusions

Which of these methods could be used to separate an insoluble solid from a soluble solid? A. Melting the mixture and then using a filter to separate out the soluble solid B. Melting the mixture, mixing it with water, and then using a magnet to separate out the insoluble solid C. Mixing the mixture with water and then using chromatography to separate the two dissolved solids D. Mixing the mixture with water, filtering out the insoluble solid, and then evaporating the water to isolate the soluble solid

D. Mixing the mixture with water, filtering out the insoluble solid, and then evaporating the water to isolate the soluble solid

Which of the following is a chemical property? A. Density B. Melting point C. Solubility D. Toxicity

D. Toxicity

Which of the following questions can be answered by science? A. What makes a song sound beautiful? B. What is the meaning of life? C. What makes a painting beautiful? D. What are the effects of low pH in soil?

D. What are the effects of low pH in soil?

During an experiment a thermometer was placed in a beaker containing hydrogen peroxide. The following observations were recorded when yeast granules were added to hydrogen peroxide. Observation 1: Fizzing and bubbling took place. Observation 2: The temperature began to rise. Based on the observation, justify the type of change (physical or chemical) that took place.

Due to the fact that a new substance was formed by adding the yeast into the hydrogen peroxide, it is a chemical change.

Read the two questions. Question 1: Is change in atmospheric CO2 levels likely to impact marine life? Question 2: Should diesel and gasoline engines compliant with CO2 emission standards be banned? Use complete sentences to explain whether both questions can be answered by science or not. Be sure to explain why for each question.

Question 1 can be answered by science because It is testable, unlike question 2 which is not testable and is based off of opinions.