UNIT QUIZ

What is the formula of the ion hydrogen sulfite, which has a charge of -1?

• SO₃^-1

• SO₄^-2

• HSO₃^-1

• H₂SO₄

Elements in a group of the periodic table are described below.

Some properties of a Certain Group of Elements:

-soft silvery-white color

-good conductor of thermal energy

-good conductor of electricity

-atoms contain a single valence electron

These elements most likely belong to which group?

• Alkali Metals

• Alkaline Earth Metals

• Halogens

• Noble Gases

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The table below lists some properties of a sample of lauric acid.

Volume: 79.6 mL; Mass: 70.022g; Boiling Point: 222C; Number of Moles: 0.350

• volume

• mass

• boiling point

• number of moles

When the equation below is balanced, what is the coefficient for oxygen?

___C₃H₈ (g) + ___ O₂ (g) --> ___ CO₂ (g) + ___ H₂O (g)

Record your answer on your answer document.

Tags

NGSS.MS-PS1-5

Some students used a variety of procedures to investigate four liquid samples. The students recorded the following information.

-when sample W was cooled, solid particles settled out of the liquid.

-the mass and volume of sample X were measured, and the density of Sample X was calculated to be 1.6g/mL

-Sample Y was heated, and the temperature was recorded. All the liquid boiled away at the same temperature and left no residue in the container.

-When a dilute acid was added to sample Z, gas bubbles formed and rapidly rose to the surface of the liquid.

Based on these observations, which sample was clearly identifiable as a pure substance?

• Sample W

• Sample X

• Sample Y

• Sample Z

Tags

NGSS.MS-PS1-4

Which of these statements is an accurate description of the ionization energies of elements in the periodic table?

• The ionization energy of lithium is greater than that of potassium.

• The ionization energy of iodine is greater than that of fluorine.

• The ionization energy of magnesium is greater than that of sulfur.

• The ionization energy of krypton is greater than that of neon.

In a famous experiment conducted by Ernest Rutherford, positively charged alpha particles were scattered by a thin gold foil. Which of the following is a conclusion that resulted from this experiment?

• The nucleus is negatively charged

• The atom is a dense solid and is indivisible

• The mass is conserved when atoms react chemically

• The nucleus is very small and the atom is mostly empty space

Which product balances the chemical equation below?

3AgNO₃ (aq) + FeCl₃ (aq) --> 3AgCl (s) + _____

• FeCl (aq)

• FeCl₂ (aq)

• FeNO₃ (aq)

• Fe(NO₃)₃ (aq)

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

X-ray crystallography is a technique that allows scientists to determine the ionic and atomic radii of elements. Which of these statements correctly describes a trend in ionic or atomic radii in the periodic table?

• The ionic radius decreases from top to bottom in a group.

• The atomic radius increases from left to right across a period

• The ionic radius remains constant from right to left across a period

• The atomic radius increases from top to bottom in a group

Which equation represents a neutralization reaction?

• H₂CO₃ (aq) --> CO₂ (g) + H₂O (l)

• H₂SO₄ (aq) + 2NaOH (aq) --> Na₂SO₄ (aq) + 2H₂O (l)

• 2H₂ (g) + O₂ (g) --> 2H₂O (l)

• 2Al(OH)₃ (s) --> Al₂O₃ (s) + 3H₂O (l)