Amanda drops an orange and a lime in the water as shown.

Amanda observes that the lime sinks while the lemon floats in the water. What can be concluded from the observation?

Taylor poured oil and water into a glass and mixed the liquids. She allowed it to sit in the glass all day, and the 2 liquids separated as shown in the picture.

What happened to the 2 liquids?

An empty water bottle will float on top of the water, but a dime will sink to the bottom.

Which physical property explains why the empty water bottle and dime react the way they do in water?

A student selects two identical glasses, labels them P and Q, and fills each with 50 mL of boiling water. She adds 5 g of sugar to glass P and 5 g of sand to glass Q. After 5 minutes, after 5 minuets the student observes the contents in glasses P and Q.

A student dissolves 10 g of salt in 90 g of water. The solution is then heated on a hot plate to speed evaporation.

When the water evaporates completely, how much salt will be left?

A student makes a mixture of gravel, soil, and sugar. The student then adds 200 mL of water to the mixture. The student wants to separate the materials in the order of gravel, soil, and sugar.

In which order should the process be done?

Shawn notices that an electrician is wearing rubber gloves and rubber boots while fixing a doorbell. What property of rubber makes it important to use when working with electricity?

Which activity will produce a new substance through a chemical change?

During an activity, a student follows the procedure listed.

1. Label two bowls 1 and 2.
2. Place sulfur powder and iron filings in each bowl.
3. Mix the contents in both bowls thoroughly.
4. Place bowl 1 on a burner and bowl 2 in a tray of cold water for 10 minuets.
5. Move a bar magnet over the contents in bowl 1 and then over the contents in bowl 2.
6. Record the observations.

The student observes that the iron fillings from bowl 2 are attracted to the magnet, but the iron fillings in bowl 1 are not. What can the student infer?

A frying pan has a steel base and a wooden handle, as shown.

What purpose(s) do the steel and wood serve?

Which instrument is used to determine the melting points of solids?

A student makes a list of changes observed.

1. water freezing
2. milk curdling
3. ice cream melting
4. corrosion of iron

Dylan decicded to make soup using the following steps:

1. chop up celery and carrots
2. open a can of chicken broth
3. Fill a pot with the broth, noodles, and the vegtables
4. Place the pot on the gas stove and turn on the burner

Which of these represents a chemical change?

A teacher asked her students to write down a pair of substances that chemically combine with each other to form a new substance. The list below shows the responses of four different students.

Rose- iron and water

Rafael- oil and water

Jonny- sugar and water

Jasmine- vinegar and baking soda

Which student' responses are correct?

Patrick wants to know the volume of the steel ball. He fills a graduated cylinder with 40 mL of water and then places the steel ball inside the graduated cylinder. He draws a before and after diagram in his science notebook.

What is the volume of the steel ball?

Mrs. Satterfield made a sugar water mixture in a glass container using tap water and sugar. She let the mixture sit in her room for 5 hours and the sugar completely dissolve. What should Mrs. Satterfield do to separate the sugar water mixture?

When 2 oxygen atoms bond chemically with 2 hydrogen atoms, hydrogen peroxide is formed.Which phrase defines this substance?

Which term defines the smallest physical unit of a substance that can exist independently?

Which term defines any substance that cannot be broken down into a simpler substance?

Which term defines the smallest part into which an element can be divided and still maintain its properties?

Michael left his bicycle laying in the yard during several rain storms. When Michael went to ride his bicycle again, he noticed rust on the metal bicycle chain.

What inference can Michael make about the rust on the metal bicycle chain?

Tina fills two containers, A and B, with 500 mL of water each. The temperature of the water in container A is 50°C, while the temperature of the water in container B is 20°C. Tina adds 10 g of salt to each container and records the time taken for the salt to dissolve in each container.

What can be a likely inference from the experiment?

Lora stated in her science paper that compounds and mixtures are different.

She based this on which statement?

A girl spilled grape juice on her parent’s white carpet. A concentrated bleach cleaning solution needs to be made to clean the grape juice out of the carpet before it leaves a purple stain.

Which statement best describes what should be done to make a concentrated bleach cleaning solution?

A student added 5 mg of salt to 200 mL of water. She later added 15 mg of sugar to the same solution.

How did adding sugar change the solution?

Lisa dropped some small solid particles into a pure liquid as seen in the diagram.

Which correctly labels X and Y in the diagram before Lisa begins to stir it and form a mixture?

Christian needed to make 1000 ml of a solution. If his solution was too concentrated, what should he do to correct the concentration?

A girl makes lemonade for her friends. She fills a jar with 1 liter of water, squeezes four lemons in the jar, and stirs the mixture thoroughly. The girl selects four identical glasses and pours the contents from the jar into the glasses, as shown. Her friends add different amounts of sugar syrup in their glasses, as shown in the table.

Which friend has the least concentrated glass of lemonade, and why?

A student performs an activity to study the properties of materials. She puts a few ice cubes in a glass bowl and places the bowl on a table. After 10 minutes, she observes that the bowl contains a clear substance that takes the shape of the bowl, as shown.

What types of change does the student observe?

A waitress blends 400 g of vanilla ice cream and 50 g of milk to make a milk shake. What is the final mass of the milk shake?

A chemistry teacher mixes 25 g of solution D with 35 g of solution E in a sealed beaker. The two solutions interact to form solution F and 15 g of a solid.

What is true about the mass of solution F?

Four students are mixing Substance A with Substance B in four separate and sealed containers. Each student is using different amounts of Substances A and B to begin the reaction. During the reaction, Substance A completely reacts with Substance B to produce Substance C and Substance D. The data is summarized in the table.

Which container will have the greatest mass at the end of the reaction?