Matter Milestones Study

The teacher shows students a pictorial model of an atom. Which element is represented by the model and what evidence is provided?

• Fluorine because the model has 19 neutrons and electrons which is represented by the atomic number found on the periodic table.

• Fluorine because the model has 9 protons which is represented by the mass number found on the periodic table.

• Fluorine because the model has 9 protons which is represented by the atomic number found on the periodic table.

• Neon because there are 10 neutrons which is represented by the atomic number found on the periodic table.

Tags

NGSS.MS-PS1-1

Students are developing models to explore the difference between a pure substance and a mixture. The students have access to Lego blocks in three different colors. They make and label two examples of pure substances and mixtures. Which table is correct?

• 
• 
• 
• 

Arrange models from greatest to least amount of energy.

• 1, 4, 3, 2

• 2, 3, 4, 1

• 4, 3, 2, 1

• 1, 2, 3, 4

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-2

A beaker with ice is placed on the counter in a science lab. The lab is at room temperature. After 20 minutes the ice becomes water. What kind of change occurred and what evidence validates your answer?

• Chemical Change; the evidence is that the water can be re-frozen in a freezer.

• Chemical Change; the evidence is that the water will evaporate becoming water vapor

• Physical Change; the evidence is that the water will evaporate becoming water vapor.

• Physical Change; the evidence is that the water can be re-frozen in a freezer.

Tags

NGSS.MS-PS3-5

A scientist discovers a solid odd-shaped unknown substance in a container. She decides to investigate the properties of the substance. She has the following materials in the lab: Water, Beakers, A Triple Beam Balance, Bunsen burner, thermometer, and Hot Plate. She begins the investigation by collecting data using the following steps: 1. Weighs a beaker on the triple beam balance and writes down the mass. 2. Places the unknown substance in the beaker and weighs both, writing down the total mass.

What are the next steps and what property is being investigated?

• Step 3: Subtract the beaker/unknown substance mass from the beaker mass. Step 4: Place the unknown substance in 10 mL of water and subtract the new volume from 10 mL. Step 5: Divide the mass of the unknown substance from Step 3 by the water displaced by the unknown substance. Type of Property: Density which is a physical property.

• Step 3: Subtract the beaker/unknown substance mass from the beaker mass. Step 4: Place the unknown substance in 10 mL of water and subtract the new volume from 10 mL. Step 5: Divide the water displaced by the unknown substance by the mass of the unknown substance from Step 3. Type of Property: Density which is a physical property.

• Step 3: Place water in the beaker and weigh the beaker. Step 4: Place the beaker on a hot plate with a thermometer Step 5: Measure the temperature after the water bubbles. Type of Property: Boiling Point which is a physical property

• Step 3: Subtract the beaker/unknown substance mass from the beaker mass. Step 4: Take the substance out of the beaker and heat it over the Bunsen burner. Step 5: Observe and document the color of the unknown substance after it is burned for 2 minutes. Type of Property: Flammability which is a chemical property.

Maya and Andrew are experimenting with the electrolysis of water. They are using the apparatus below to break water into its components.

Which model best provides evidence for the conservation of matter in this process?

• H2O <-> 2H + O

• H2O <-> H2 + O2

• 2H2O <-> 2H2 + O2

• H2O <-> H2 + O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The three jars show the movement of particles in three states of matter. Nitrogen is a gas at room temperature. The table provides the boiling and melting point of nitrogen.

Which jar represents nitrogen in a classroom?

• Jar A

• Jar B

• Jar C

• None of these Jars

Tags

NGSS.MS-PS1-4

Nitrogen is a gas at room temperature. The table provides the boiling and melting point of nitrogen.

If the temperature in the Jar was lowered to the -346oF and then raised to -320oF, which sequence of jars represents these changes in temperature?

• C to B to A

• C to A to B

• A to B to C

• B to C to A

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

There is a fresh water shortage in California. Scientists are now desalinating ocean water to help relieve the freshwater shortage. Desalination is the process by which salt water is heated until the water boils off and is collected in a separate container. Which of the following answers BEST describes the type of change and evidence to support the claim?

• Physical Change and the evidence is the salt and water in separate containers

• Physical Change and the evidence is the boiling salt water.

• Chemical Change and the evidence is the salt and water in separate containers.

• Chemical Change and the evidence is the boiling salt water.

Tags

NGSS.MS-PS3-4

The teacher in the physical science class projects a model of an atom below. She asks the students to identify problems with the model and to adjust the model so that it represents a Nitrogen atom.

Which two answers below address the teacher’s request.

• The problem with the model is that there are too many protons.

• This model needs 1 more proton and neutron to be a representation of Nitrogen.

• The problem with the model is that there are not enough electrons.

• This model needs 1 less neutron to be a representation of Nitrogen.

• This model needs 1 more proton and electron to be identified as a Nitrogen atom.

Tags

NGSS.MS-PS1-1