ACAP EMCE

The model shown represents one molecule of hydrazine, a chemical in rocket fuel.

The black spheres represent nitrogen atoms, and the white spheres represent hydrogen atoms.

Based on the model, what is the atomic composition of hydrazine?

• 1 atom of nitrogen and 1 atom of hydrogen

• 4 atoms of nitrogen and 2 atoms of hydrogen

• 2 atoms of nitrogen and 2 atoms of hydrogen

• 2 atoms of nitrogen and 4 atoms of hydrogen

Tags

NGSS.MS-PS1-1

According to the Wall Street Journal, Americans use 100 billion plastic shopping bags annually. The chemicals that make up most of these bags come from petroleum. Many people argue that because the petroleum used to make plastic shopping bags is a nonrenewable resource, it is better to use reusable cotton cloth bags for shopping. Other people argue that using plastic shopping bags is better for the environment. Which claim would best support the position of the supporters of using plastic shopping bags?

• A single plastic shopping bag needs 10 to 100 years to break down in a landfill.

• Plastic shopping bags provide an inexpensive and convenient source of packaging for

  stores.

• The manufacture of cloth shopping bags provides jobs and helps the economies of

  several different countries.

• Producing a reusable cloth shopping bag requires 173 times as much energy as

  producing a plastic shopping bag.

Tags

NGSS.HS-ESS3-4

NGSS.HS-ETS1-3

NGSS.HS-LS2-7

A group of students heated four substances: W, X, Y, and Z. They observed the substancesbefore heating, during heating, and after the substances had cooled. Results are recorded in the included table. Based on the information, which substance or substances probably underwent a chemical reaction?

• W

• X

• W and X

• X and Y

Tags

NGSS.MS-PS1-2

Willa created two models to describe conservation of mass in a chemical reaction using

plastic blocks of different colors. Each color represented an atom of a different element. After

the models were created, Willa noticed that model #1 had an equal number of blocks in the

reactants and products, while model #2 had fewer blocks in the reactants than in the products.

Which model correctly describes conservation of mass?

• Both models are correct because matter can be created but cannot be destroyed.

• Both models are correct because reactions are correct as long as reactants are rearranged to form products.

• Model #1 is correct because matter can be destroyed but cannot be created.

• Model #1 is correct because the amount of matter in the reactants must equal the amount of matter in the products.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A kerosene lantern is a lighting device. It uses a petroleum product called kerosene as fuel. The kerosene is held in the base of the lantern, and a cloth wick soaks up the kerosene. Air can flow into the lantern through holes in the device. The diagram shows a kerosene lantern. When the wick is lit, the kerosene in the wick undergoes a chemical reaction with oxygen in the air to release energy in the form of light.

Which change to the device would increase the amount of time the lantern provides light?

• Increase the size of the base to hold more kerosene.

• Change the shape of the flame to give off more light.

• Increase the size of the air holes to allow more air flow.

• Change the material of the wick to soak up more kerosene.

Tags

NGSS.MS-ETS1-1

NGSS.MS-PS3-3

Students are building models to represent the molecular structure of sodium bicarbonate, NaHCO3, commonly known as baking soda. The students are using toothpicks to represent bonds and jelly beans to represent atoms. Red jelly beans represent sodium atoms (Na), white jelly beans represent hydrogen atoms (H), black jelly beans represent carbon atoms (C), and blue jelly beans represent oxygen atoms (O). The resulting student models are displayed in the table below. Which student made the most accurate representation of sodium bicarbonate?

• Student 1

• Student 2

• Student 3

• Student 4

Tags

NGSS.MS-PS1-1

The following four models show either a pure substance or a mixture. Individual circles represent atoms, with each color representing a different element. Circles that are touching each other represent chemical bonds between atoms. Peyton claims that models 2, 3, and 4 are mixtures. Jada argues that only models 3 and 4 are mixtures. Which piece of evidence best supports Jada’s claim over Peyton’s?

• Model 2 contains two types of elements.

• Model 4 contains two types of elements.

• The atoms in Model 2 are bonded to form one type of compound.

• None of the atoms in Model 4 are bonded to each other.

Tags

NGSS.MS-PS1-1

The following diagram shows the reactants involved in the combustion of methane gas. (CH4). Which choice of products best completes the model to illustrate conservation of mass?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Timothy wants a device that will keep his water cold until lunch. He knows that vinegar and baking soda react to cause an endothermic reaction so he decides to construct his own thermos by placing a vinegar and baking soda reaction in a large bottle that surrounds his smaller water bottle. Timothy also insulates both bottles by placing a single layer of wool cloth around the outer bottle. At lunch, he determines that the water felt cooler than before, but not as cool as he would like. Which adjustment to the thermos would not improve the chances of keeping his water even cooler tomorrow?

• Adding less vinegar and baking soda

• Adding a double layer of wool

• Researching fabrics to find a better insulator than wool

• Replacing the inner bottle with a bottle that has thinner walls

Tags

NGSS.MS-ETS1-2

NGSS.MS-ETS1-3

NGSS.MS-PS1-6

NGSS.MS-PS3-3

Sasha is mixing a white powder with a clear liquid to see if a chemical reaction will occur. Based on previous experiments, she knows that reactions occur if there is a color change, temperature change, or formation of a precipitate. Which other signs could indicate that a chemical reaction has occurred?

• 1 and 3

• 1 and 4

• 2 and 3

• 3 and 4

Tags

NGSS.MS-PS1-2