Chemistry Unit 1 Summative Assessment

Please have your planner open to your periodic table, or open open ptable.com in a second tab. You will need to use the periodic table to answer some questions.

Before every question there is an audio file reading you the question.

1

Which of the following statements about the properties of elements related to an atomic emission spectrum are true? Select all that apply.

1

A chemistry graduate student is very skilled at analyzing atomic emission spectra. The printout of her spectrum is printed in black and white. Therefore she has to rely on comparing the widths and positions of spectral lines during analysis. Observe the various atomic emission spectra shown in the figure below. Which of the elements shown makes up the unknown spectrum (highlighted in the red box)? Click on the picture to zoom in on it.

1

The elements are listed on the periodic table in order of atomic number, starting with hydrogen, followed by helium, lithium, etc. Which of the following statements best describes the pattern of increasing atomic number?

1

Based on the periodic table, which other element is likely to share common properties with sodium (symbol Na) due to having the same number of electrons in the outermost energy level?

1

Which of the following is a characteristic of the all of the Group 14 elements (C, Si, Ge, Sn, and Pb)?

1

An atom of chlorine has 17 electrons. These electrons are present in energy levels around the nucleus. What is the electron configuration of chlorine?

1

Each arrow shows an electron moving from one energy level to another. Which transitions will release energy by emitting a photon?

1

Which of the following statements best describes what is happening in the transition labeled C?

1

During a classroom experiment, a burning magnesium ribbon (Mg) was dropped into a glass test tube filled with oxygen (O2). A bright white flame was produced. A white powdery substance formed at the end of the reaction. The white substance was identified as the compound magnesium oxide (MgO).
Which of the following statements best describes the change that occured?

1

Identify the atom by its element name.

1

What is the overall charge of this atom?

1

If an extra electron were added to the second energy level, which term would best describe the atom?

1

Order the following atoms from highest to lowest number of protons.

1

The chemial compound methane has the chemical formula CH4. How many total atoms are in a single molecule of methane?

1

From the list below, which chemical formulas are compounds? Select all that apply.

1

The picture represents molecules from a sample of a compound. Which chemical formula could be the correct formula for this compound?

1

Which of the following is the correct Lewis Dot Structure for a boron atom?

3

Liquid Nitrogen is a colorless, odorless, diatomic element used in many fun experiments. When exposed to room temperature, liquid nitrogen immediately begins to boil into nitrogen gas. Your classmate says that this is a chemical change because a gas was produced which wasn’t present before. Is your classmate correct, or incorrect? Explain.

3

Nitrogen gas, N2, reacts with oxygen gas, O2, to form nitrogen monoxide, NO.
Match each of the models below with the correct description. (Click and drag each of the descriptions to match with a diagram. There is only one correct matching)

N2 gas mixed with O2 gas
Pure NO gas
Pure N2 gas

Model 2

Which of the following statements about the properties of elements related to an atomic emission spectrum are true? Select all that apply.

The elements are listed on the periodic table in order of atomic number, starting with hydrogen, followed by helium, lithium, etc. Which of the following statements best describes the pattern of increasing atomic number?

Based on the periodic table, which other element is likely to share common properties with sodium (symbol Na) due to having the same number of electrons in the outermost energy level?

Which of the following is a characteristic of the all of the Group 14 elements (C, Si, Ge, Sn, and Pb)?

An atom of chlorine has 17 electrons. These electrons are present in energy levels around the nucleus. What is the electron configuration of chlorine?

Each arrow shows an electron moving from one energy level to another. Which transitions will release energy by emitting a photon?

Which of the following statements best describes what is happening in the transition labeled C?

Identify the atom by its element name.

What is the overall charge of this atom?

If an extra electron were added to the second energy level, which term would best describe the atom?

Order the following atoms from highest to lowest number of protons.

The chemial compound methane has the chemical formula CH4. How many total atoms are in a single molecule of methane?

From the list below, which chemical formulas are compounds? Select all that apply.

The picture represents molecules from a sample of a compound. Which chemical formula could be the correct formula for this compound?

Which of the following is the correct Lewis Dot Structure for a boron atom?

Nitrogen gas, N2, reacts with oxygen gas, O2, to form nitrogen monoxide, NO.Match each of the models below with the correct description. (Click and drag each of the descriptions to match with a diagram. There is only one correct matching)

Nitrogen gas, N2, reacts with oxygen gas, O2, to form nitrogen monoxide, NO.
Match each of the models below with the correct description. (Click and drag each of the descriptions to match with a diagram. There is only one correct matching)