Physical Science

• . 8,912 grams

• . 16,382 grams

• . 65,534 grams

• 153,844 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

• Step 4. Shake the bottle.

  Observation: The eyedropper will float to the top because water will come out of it, and the volume of air will increase.

• Step 4. Squeeze the sides of the bottle.

  Observation: The eyedropper will float to the top because water will come out of it, and the volume of air will increase.

• Step 4: Shake the bottle.

  Observation: The eyedropper will sink to the bottom because water will go inside it, and the volume of air will be reduced.

• Step 4: Squeeze the sides of the bottle.

  Observation: The eyedropper will sink to the bottom because water will go inside it, and the volume of air will be reduced.

In which state, or states, of matter can particles expand to completely fill their container?

• I

• II

• III

• I, II, and III

Tags

NGSS.MS-PS1-4

Robert measured the air pressure in his bicycle tire, and it was low.

What can Robert do to increase the air pressure in his tire?

• increase the density of the air

• increase the volume of the air

• decrease the density of the air

• decrease the temperature of the air

• I = solid phase

• II = liquid phase

• III = plasma phase

• III = gaseous phase

Leah is cleaning her collection of old pennies using vinegar. As she cleans them, the following chemical reaction occurs:

What action will show that mass is conserved in this chemical reaction?

• comparing the types of products and reactants

• comparing the weights of the products and the reactants

• comparing the physical appearance of the products and the reactants

• comparing the number of molecules in the products and the reactants

Tags

NGSS.MS-PS1-5

Which of the following actions will increase the rate at which a sugar cube dissolves in water?

• stir the water before adding the sugar

• cool the water before adding the sugar cube

• cool the sugar cube before adding it to the water

• crush the sugar cube before adding to the water

Tags

NGSS.MS-PS1-2

What is the name of the compound CCl₄?

• carbon chloride

• cobalt chloride

• carbon tetrachloride

• monocobalt tetrachloride

Tags

NGSS.MS-PS1-1

Two students are discussing the law of conservation of mass. The students disagree on how to test conservation of mass, especially when the reaction involves the combustion of charcoal. Student A believes that burning charcoal violates the Law of Conservation of Mass because the charcoal produces heat when it burns, and the ashes weigh as much as the original briquettes. Student B believes that student A is mistaken because some of the products produced when burning charcoal are gases, and it is difficult to capture gaseous products.

Which experiment will provide the BEST method for testing the law of conservation of mass when burning charcoal?

• Place a pre-weighed briquette of charcoal into a pre-weighed porcelain dish. Heat the dish to cause the briquette to burn. Allow the charcoal to burn completely to ash. Weigh the ash and the dish. The initial mass of the briquette and the dish should be equal to the final mass of the ash and the dish.

• Place a pre-weighed briquette of charcoal into a pre-weighed porcelain dish inside of a combustion chamber containing a known mass of oxygen. Heat the dish to cause the briquette to burn. Allow the charcoal to burn completely to ash. Collect all the combustion gases while the briquette is burning. The total initial mass should equal the total final mass.

• Place a pre-weighed briquette of charcoal into a porcelain crucible. Heat the crucible to cause the briquette to burn. Allow the charcoal to burn completely to ash. Collect the combustion gases by bubbling them through water. The mass of the charcoal should equal the mass of the ash plus the mass of heat released, and the mass of gases produced.

• Place a pre-weighed piece of charcoal into a porcelain dish. Heat the dish to cause the charcoal to burn completely to ash. Collect the combustion gases after bubbling them through water. The mass of the charcoal and the dish should equal the total mass of products less the mass of heat produced

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Chromium-55,

55

Cr

, is a radioactive isotope used in scientific research. It has a half-life of 2 hours. A scientist can perform her experiments as long as the original sample contains AT LEAST 15 grams of non-decayed chromium-55.

If a scientist begins with 1,000 grams of chromium-55 at 06:00, by what time of the day MUST she complete her experiment? (Note that time is given in 24-hour clock format)

• 14:00

• 16:00

• 18:00

• 20:00