Your teacher gives you a mystery substance that has a mass of 160 g and a volume of 57 cm³. What is the density of the mystery substance?

The overall charge of an atom is electrically neutral even though it contains charged particles. What is the best explanation for this phenomenon?

Liam’s mother had to hang his clean clothes outside because the dryer in their Florida home broke. How did Liam’s clothes dry?

The elements in one period of the periodic table (SC.8.P.8.6)

In the periodic table, how are elements in the same group related to each other? (SC.8.P.8.6)

Why is it useful for scientists to develop models for the structure of atoms?

Based on the data in the chart above, which statement about these two cubes is TRUE?

Paul tested the effect of temperature on the growth of bread mold. Before the experiment, he hypothesized that bread mold grows better in warm temperatures. He conducts his experiment and more mold grew at 15°C than 30°C in 48 hrs. How would you BEST describe the results of Paul's experiment?

Ling's grandfather told him that garlic was good for you. Ling wanted to test whether garlic would kill bacteria. He set up three groups of petri dishes in which he grew bacteria. The first group of dishes contained bacteria with no garlic present. The second group contained bacteria with 20 mL of garlic. The third group contained bacteria as well as 60 mL of garlic. After 24 hours, Ling measured the amount of bacterial growth that had occurred. He found that the third group had much less bacterial growth than the others. What was the independent variable in this experiment?

Ashley hypothesizes that the speed of a ball rolling downhill is greater on steep hills than on hills that are not as steep. How can Ashley BEST test her hypothesis?

Chandra hypothesized that the blue winged butterfly likes dark, moist places over sunny, dry environments. She performs an experiment to test her hypothesis where she repeats the experiment three times. None of the results support her hypothesis. What should she do?

Your teacher gives you a table of substances and their physical properties. She gives you three unknown samples of substances. How could you determine what each substance is? (SC.S.P.8.4)

How are repeated trials different from replication?

Benny fills seven bottles with different amounts of water (H2O), as shown below. When he taps on the bottles with a spoon, each produces a different pitch. Bottle A, which holds the least amount of water, produces the lowest pitch. Bottle B has a slightly higher pitch, and bottle C has an even higher pitch. The pitch continues to get higher, all the way through bottle G, which holds the most water. Study the picture and the description of the experiment above. Which of the following statements BEST describes Benny’s observations?

Benny fills seven bottles with different amounts of water (H2O), as shown below. When he taps on the bottles with a spoon, each produces a different pitch. Bottle A, which holds the least amount of water, produces the lowest pitch. Bottle B has a slightly higher pitch, and bottle C has an even higher pitch. The pitch continues to get higher, all the way through bottle G, which holds the most water. Study the picture of the bottles and the description of the experiment above. Which of the following statements about the pitch made by these bottles when tapped with a spoon is TRUE?

Eliza planted 50 bean seeds, 50 marigold seeds, 50 tomato seeds, and 50 grass seeds in four different containers. She left each container in a warm, sunny spot. She added 100 milliliters of water (H2O) to each container each day. After 10 days, Eliza recorded the number of small plants in each container. Her data is recorded in the table below. Seed Experiment Data Seed Type | Number of Seeds Planted | Number of Plants After 10 Days Bean | 50 | 35 Marigold | 50 | 29 Tomato | 50 | 40 Grass | 50 | 37 Study the data chart and the description of Eliza’s experiment given above. Which of the following statements BEST compares the number of plants produced by different types of seeds?

Eliza wonders if the amount of water affects the number of plants produced. What should she do?

Eliza planted 50 bean seeds, 50 marigold seeds, 50 tomato seeds, and 50 grass seeds in four different containers. She left each container in a warm, sunny spot. She added 100 milliliters of water (H₂O) to each container each day. After 10 days, Eliza recorded the number of small plants in each container. Her data is recorded in the table below. Seed Experiment Data Seed Type | Number of Seeds Planted | Number of Plants After 10 Days Bean | 50 | 35 Marigold | 50 | 29 Tomato | 50 | 40 Grass | 50 | 37 Study the data table and the description of the experiment above. What did Eliza do to make her findings valid?

Cailynn wanted to know if adding fertilizer would create taller pepper plants that produced more peppers. She mixed up a solution of fertilizer and water using the amount recommended on the label. She planted the pepper plants in the same size pots with the same amount of potting soil. All of her pepper plants received the same amount of sunlight. The only difference between her two groups of pepper plants was that the one group had fertilizer in the water they were given. She measured the height of each plant every week for 3 months. She also counted the number of peppers each plant produced. What is the outcome variable (dependent variable) in Cailynn’s experiment? (SC.8.N.1.1)

Cailynn wanted to know if adding fertilizer would create taller pepper plants that produced more peppers. She mixed up a solution of fertilizer and water using the amount recommended on the label. She planted the pepper plants in the same size pots with the same amount of potting soil. All of her pepper plants received the same amount of sunlight. The only difference between her two groups of pepper plants was that the one group had fertilizer in the water they were given. She measured the height of each plant every week for 3 months. She also counted the number of peppers each plant produced.

What is the test variable (independent variable) in Cailynn’s experiment? (SC.8.N.1.1)

Cailynn wanted to know if adding fertilizer would create taller pepper plants that produced more peppers. She mixed up a solution of fertilizer and water using the amount recommended on the label. She planted the pepper plants in the same size pots with the same amount of potting soil. All of her pepper plants received the same amount of sunlight. The only difference between her two groups of pepper plants was that the one group had fertilizer in the water they were given. She measured the height of each plant every week for 3 months. She also counted the number of peppers each plant produced. Study the description of the experiment above. Which group of plants serves as Cailynn's control group?

Cailynn wanted to know if adding fertilizer would create taller pepper plants that produced more peppers. She mixed up a solution of fertilizer and water using the amount recommended on the label. She planted the pepper plants in the same size pots with the same amount of potting soil. All of her pepper plants received the same amount of sunlight. The only difference between her two groups of pepper plants was that the one group had fertilizer in the water they were given. She measured the height of each plant every week for 3 months. She also counted the number of peppers each plant produced. Study the description of the experiment above. What were Cailynn's constants (controlled variables)?

Based on the chart below, which element has particles that are packed most closely together at this temperature?

Based on the chart below, which element has particles that are farthest apart at this temperature?

Based on the chart below, which element is the most dense at this temperature?

The density of corn syrup is 1.33 g/mL and the density of vegetable oil is 0.91 g/mL. Which liquid(s) will float on water?

Use the table below to predict what would happen if corn syrup, water, and corn oil were combined in a beaker.

Chris has designed a mini hot air balloon. In order for his hot air balloon to work, he must use a candle to heat up the air trapped under the balloon. When molecules are heated they move faster, take up more space, and their volume increases. How does this enable the hot air balloon to rise?

Lindsay noticed that the baby flamingos born at the zoo all had white feathers. She noticed all the adult flamingos had bright pink feathers. While doing some research on the internet, she found an article that discussed how diet can affect the feathers of flamingos. She decided that a specific type of shrimp eaten by the flamingos would cause the feathers to turn pink over time. She designed an experiment where one group of flamingos would be fed a diet that included the special shrimp and the other group would not have this shrimp in their diet. Each group was made up of flamingos of the same size, gender, weight and health. All flamingos were fed the same amount of food. What was her hypothesis?

Lindsay noticed that the baby flamingos born at the zoo all had white feathers. She noticed all the adult flamingos had bright pink feathers. While doing some research on the internet, she found an article that discussed how diet can affect the feathers of flamingos. She decided that a specific type of shrimp eaten by the flamingos would cause the feathers to turn pink over time. She designed an experiment where one group of flamingos would be fed a diet that included the special shrimp and the other group would not have this shrimp in their diet. Each group was made up of flamingos of the same size, gender, weight and health. All flamingos were fed the same amount of food. What was the independent variable?

Mr. Lambdin's class is studying how solid materials dissolve in liquids and what effect temperature has on this process. In an experiment, students dissolve as much sugar (C12H22O11) as possible into water (H2O) at different temperatures. They generate the data shown in the table below. What is the independent variable in this experiment? (SC.8.N.1.1)

What is the dependent variable in this experiment?

When observations deal with amounts or numbers they are called

An explanation of the things you observe based on logical reasoning and prior knowledge is called a(n):

A scientist has an unknown solid substance and would like to identify it. She determines that the mass of the sample is 1230 g. She fills a graduated cylinder to 100 mL and then GENTLY slides the unknown sample into the water. The water level rises to 258 mL. Based on the information given above and the table below, what is the unknown substance?

Which parts of the atom move around the nucleus? (SC.P.8.7)

Neutrons have (SC.8.P.S.7)

In a neutral atom, the number of protons equals the number of