Unit 1: Diagnostic Test

A student is using colored marbles to make a model of Ether, (C₂H₅)₂O. Black marbles represented carbon atoms, orange marbles represent hydrogen atoms, and green marbles represent oxygen atoms. What combination of marbles should the student use for the model?

• 4 black

  7 orange

  1 green

• 2 black

  10 orange

  1 green

• 4 black

  10 orange

  1 green

• 2 black

  5 orange

  2 green

Tags

NGSS.MS-PS1-1

A student compares the physical properties for samples of two elements in order to classify them. The table shows her observations.

Which statement do her observations support?

• Both Substance X and Substance Y are metals.

• Both Substance X and Substance Y are nonmetals.

• Substance X is a nonmetal, and Substance Y is a metal.

• Substance X is a metal, and Substance Y is a nonmetal.

A manufacturer selected one of the metals from the table below to use in producing a high-speed jet plane. A metal that has a density of 1.85 g/cm³ was selected.

Which metal was selected?

• Alulminum

• Beryllium

• Magnesium

• Titanium

A model of an atom is shown below.

Which statement best describes the particles that make up the part labeled X in the model?

• They all have no charge.

• They all have a positive charge.

• Some have a positive charge and some have no charge.

• Some have a positive charge and some have a negative charge.

Tags

NGSS.MS-PS1-1

The atoms of a certain element each contain 36 protons and 8 valence electrons. Which statement correctly identifies this element and describes its chemical reactivity?

• The element is krypton, Kr, and it is not very reactive.

• The element is chlorine, Cl, and it is highly reactive.

• The element is krypton, Kr, and it is highly reactive.

• The element is chlorine, Cl, and it is not very reactive.

Tags

NGSS.MS-PS1-1

The shaded regions in the periodic table show four sets of elements.

Which set of elements includes mostly elements that do not react readily?

• W

• X

• Y

• Z

A student is following the recipe shown below to make a frittata.

Which steps of the recipe involves a chemical change in matter?

• Steps 1, 2, and 3

• Steps 1, 3, and 4

• Steps 3 and 4 only

• Step 4 only

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student mixes two liquid substances together in a flask. Which observation does NOT indicate that a chemical reaction is taking place in the flask?

• The flask heats up.

• A new color comes from the flask.

• When the student stops stirring, one of the liquids rises to the top of the flask, while the other sinks to the bottom.

• Bubbles of gas form in the flask, and the mixture continues bubbling for several seconds after the student stops stirring.

Tags

NGSS.MS-PS1-2