Acellus Chemistry

The density data for a substance was collected in the table to the right. What is the range of the data? Range= highest data value - lowest data value A. 0.1 B. 6.5333 C. 19.6 D. 6.5

A. 0.1

Which of these explains what a law is? A. The current model of the atom is definitely correct. B. A set of observations about an experiment. C. Observations about something that happens in the world. D. A possible explanation for why something happens

A. C. Observations about something that happens in the world.

Which part of the scientific method helps the experimenter design a useful test? A. Conducting background research B. Testing the hypothesis C. Analyzing the data

A. Conducting background research

Identify this piece of lab equipment. A. Erlenmeyer Flask B. Beaker C. Graduated Cylinder D. Volumetric Flask

A. Erlenmeyer Flask

What is this piece of lab equipment? A. Graduated Cylinder B. Ring Stand C. Clay triangle D. Beaker

A. Graduated Cylinder

If a scientist tells us that two atoms separate from one another, what kind of observation did they make? A. Microscopic B. Macroscopic

A. Microscopic

Which type of chemistry studies changes to the nucleus of the atom? A. Nuclear Chemistry B. Analytical Chemistry C. Biochemist D. Organic Chemistry

A. Nuclear Chemistry

Which of these is a potential use for a beaker? A. Obtaining reagents from the original supply B. Holding a liquid that evaporates fast at room temperature C. Creating a specific concentration of a solution D. Making specific (precise) measurements

A. Obtaining reagents from the original supply

Which of these is an example of chemistry you might have contact with in your bathroom? A. Shampoo for your hair B. Boiling water for noodles C. Laundry detergent D. Fertilizer for your plants

A. Shampoo for your hair

What is the equipment marked with the arrow? A. Stirring Rod B. Volumetric Flask C. Graduated Cylinder D. Erlenmeyer Flask

A. Stirring Rod

What is a benefit of this model of the atom, called the Plum Pudding model? A. The model demonstrates two different charges in the atom B. The model is 2 dimensional C. The model is not real size.

A. The model demonstrates two different charges in the atom

What value would you put in the NUMERATOR of this calibration? A. 5°C B. 10°C C. 20°C D. 1°C

B. 10°C

What is the calibration of this Erlenmeyer Flask? A. 125 mL B. 25 mL C. 50 mL D. 10 mL

B. 25 mL

The density for a substance was experimentally determined as 6.5 g/mL. The same substance has an accepted density of 7.4 g/mL. What is the percent error for the data? A. About 0.12% B. About 12% C. About 14% D. About 0.14%

B. About 12%

Which data is an example of quantitative data? A. An apple has a sweet scent B. An apple has a mass of 86.5 g. C. An apple is red and yellow

B. An apple has a mass of 86.5 g.

Which of these is an example of chemistry you might have contact with in your kitchen? A. Shampoo for your hair B. Boiling water for noodles C. Fertilizer for your plants D. Laundry detergent

B. Boiling water for noodles

Which part of the scientific method is used to help other scientists repeat the work of the original experiment? A. Conducting background research B. Conducting the same experiment C. Conducting a hypothesis

B. Conducting the same experiment

Suppose both groups used the same type of toothbrush throughout the experiment. Where would same type of toothbrush go in an IV C DV chart? A. Dependent variable (DV) B. Constant (C) C. Independent variable (IV)

B. Constant (C)

In the experiment, which of these is a benefit of creating a grid for testing? A. It allows quantitative (numeric) measurement to be recorded easily B. It allows an organized way to conduct qualitative observations C. It provides three trials of data to increase validity of the experiment D. It ensures reactions will happen no matter the amount of reactant

B. It allows an organized way to conduct qualitative observations

If we say "The circle is blue," what kind of observation are we making? A. Microscopic B. Macroscopic

B. Macroscopic

Which of these is a common use for a graduated cylinder? A. Swirling the contents during a reaction to help mixing B. Making specific (precise) measurements C. Containing gaseous products of a reaction D. Containing gaseous reactants for a reaction

B. Making specific (precise) measurements

Which of these are involved in creating new technologies? A. Science only B. Science, engineering, and math C. Math only D. Engineering only

B. Science, engineering, and math

According to the experimental data, which substance reached the most often? A. Substance A B. Substance B C. Substance D D. Substance C.

B. Substance B

Which of these is a limitation of using this simulation to study and understand the behavior of light through a convex lens? A. The simulation shows the relative positioning to the rays. B. The measurements of the rays will change based on the size of the screen C. It allows us to visualize the behavior of light rays that we normally cannot see

B. The measurements of the rays will change based on the size of the screen

Using your understanding of creating trials with the grid, which observation should occur in the well with the missing data? A. Bubbles B. Warm to touch C. Clear to pink D. Cool to touch

B. Warm to touch

Which well choice should produce the same precipitate as the one marked in a second trial? A. Well C B. Well A C. Well D D. Well B

B. Well A

What is the calibration of this graduated cylinder? A. 1 mL B. 5 mL C. 2 mL D. 10 mL

C. 2 mL

The calibration is to the 2mL, so we do not estimate another digit. What is the volume of liquid in the cylinder? A. 37 mL B. 37.0 mL C. 36 mL D. 36.0 mL

C. 36 mL

Which of these explains what a theory is? A. A set of observations about an experiment. B. A model of the atom C. A possible explanation for why something happens D. The explanation of why hypothesis is disproven

C. A possible explanation for why something happens

Which type of chemistry uses experimentation and equipment to identify the components of molecules and materials? A. Biochemistry B. Organic Chemistry C. Analytical Chemistry D. Nuclear Chemistry

C. Analytical Chemistry

Where should we measure the volume of this graduated cylinder? A. At the top of the meniscus B. At the 21 mL making C. At the bottom of the meniscus D. At the 22 mL marking

C. At the bottom of the meniscus

Identify this equipment A. Volumetric Flask B. Erlenmeyer Flasks C. Beakers D. Graduated Cylinder

C. Beakers

What is the indication of reaction the student observed according to the experimental data? A. Color change B. Temperature change C. Formation of bubbles D. Formation of a precipitate

C. Formation of bubbles

What is the independent variable in this experiment? A. How much water the subject drink B. How likely the surface are to get cavities C. How often the subject brush and floss D. How much sleep the subject gets

C. How often the subject brush and floss

Which of these is the dependent variable? I felt sick, so I skipped dinner. A. I felt sick B. These are both independent variables C. I skipped dinner

C. I skipped dinner

When would you use this piece of safety equipment? A. If you accidentally broke a beaker B. If you accidentally started a fire in the trashcan C. If you got chemicals in your eye when a test tube broke D. If your hot plate short-circuited and sparked

C. If you got chemicals in your eye when a test tube broke

What term represents the part of an experiment that we purposely change from one trial to the next? A. Constant B. Dependent Variable C. Independent Variable D. Hypothesis

C. Independent Variable

Suppose the dentist adds a third group and instructs them to stop all brushing and flossing Where would stopping all brushing and flossing go in an IV C DV chart? A. Dependent variable (DV) B. Constant (C) C. Independent variable (IV) D. None of the above

C. Independent variable (IV)

Which of these is the purpose of a Volumetric purpose of a Volumetric Flask? A. Swirling the contents during a reaction to help mixing B. Measuring volumes of reactants for a reaction C. Making molar solutions (create a certain solution in a specific volume) D. Containing gaseous reactants for a reaction

C. Making molar solutions ( create a certain solution in a specific volume )

Which of these is a common use for an Erlenmeyer Flask? A. Containing gaseous reactants for a reaction B. Containing gaseous products of a reaction C. Swirling the content during a reaction to help mixing D. Making specific (precise) measurements

C. Swirling the content during a reaction to help mixing

What does the range of the dataset tell us? A. The difference between the accepted and experimental values B. The central tendency of the values within a dataset C. The difference between the lowest and highest values D. The value that appears most often in a dataset

C. The difference between the lowest and highest values

You are cleaning up your lab area and notice there is a beaker sitting on an unplugged hot plate. What is the correct response? A. The hot plate is unplugged, so pickup the beaker with bare hands B. It wasn't your hot plate and beaker, so leave it for the person that left it there. C. The hot plate is unplugged, but the beaker might be hot. Use heat protection to pick it up D. Plug in the hot plate to ensure the solution is fully mixed before disposal

C. The hot plate is unplugged, but the beaker might be hot. Use heat protection to pick it up

What is a potential limitation of this molecular model? A. The model uses different colors to identify different types of atoms B. The shows the representative bond angles between atoms C. The model uses the same size for each type of atom even though atoms have different sizes D. The model shows how the various atoms are connected in the molecule

C. The model uses the same size for each type of atom even though atoms have different sizes

How should this personal equipment be worn? A. They are not needed for most experiments B. They should be on the forehead and pulled tight C. They should be covering both eyes and pulled tight D. They should be on loosely around the neck

C. They should be covering both eyes and pulled tight

What is the purpose of beaker tongs? A. Breaking larger particles into smaller ones B. Mixing two materials together C. protect against burns from hot glass D. Determine the density of an object

C. protect against burns from hot glass

Consider the densities of the metal in the table to the right The metal was thought to be silver (density = 10.49 g/cm^3) What is the % error? A. 0.0200% error B. 10.49% error C. 10.51% error D. 0.1907% error

D. 0.1907% error

What is the calibration of this thermometer? A. 10°C B. 2°C C. 5°C D. 1°C

D. 1°C

Which type of chemistry studies the interactions of atoms and molecules within living things? A. Nuclear Chemistry B. Organic Chemistry C. Analytical Chemistry D. Biochemistry

D. Biochemistry

Which of these is an example of chemistry you might have contact with in your garden? A. Boiling water for noodles B. Shampoo for your hair C. Laundry detergent D. Fertilizer for your plant

D. Fertilizer for your plant

What type of model does the information below represent? 2C(s) + 4H2(g) + O2(g) --> 2CH3OH A. Particle Model B. Analogy Model C. Computer Simulation Model D. Mathematical Model

D. Mathematical Model

Which of the following is NOT part of a scientific experiment? A. Wear PPE to avoid physical harm or hazards B. Read the whole procedure before starting C. Gather and label all materials that you will be using D. Only post results that support your hypothesis

D. Only post results that support your hypothesis

Why are stirring rods normally made of glass? They are made of glass in order to... A. Ensure they break easily and cut the user. B. Protect the user from getting frostbite C. Keep the reaction from exploding when it touches. D. Reduce the likelihood of the rod reacting with the liquid.

D. Reduce the likelihood of the rod reacting with the liquid.

Why are some of the circles marked an "X" for the experiment? A. The X tells us the reagents will always look different when combined with themselves B. The X tells us to look closely for a reaction in those containers C. The X tells us those containers will have a change in temperature D. The X represents combining two portions of the same chemical. There would never be a change

D. The X represents combining two portions of the same chemical. There would never be a change

The percent error for the data set is 12% which is greater than 5%. The range of the data is 0.1, which is considered very close together. A. The data is neither accurate nor precise B. The data is both accurate and precise C. The data is accurate but not precise D. The data is not accurate but its precise

D. The data is not accurate but its precise

Why is it preferable to have more spaces between 2 marked values on a beaker? A. Because it makes the measurement LESS accurate B. Because it prevents a meniscus from forming C. Because it makes the beaker cheaper D. because it makes the measurement MORE accurate

D. because it makes the measurement MORE accurate

Consider the densities of the metal in the table to the right The metal was thought to be iron (density = 7.86 g/cm^3). What is the % error? A. 7.86% error B. 0.0300% error c. 0.382% error D. 7.83% error

c. 0.382% error