Chemistry Semester Exam

(8.5A) Which model best represents an atom of lithium?

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Tags

NGSS.MS-PS1-1

(8.5A) The element Potassium (K) has-

• 19 protons

• 19 neutrons

• 39 electrons

• 58 neutrons

Tags

NGSS.MS-PS1-1

(8.5B) Four students were asked to name the parts of an atom that determines the atom's identity and chemical properties. The student's responses are shown in the table below. Which student's responses were correct?

• Student 1

• Student 2

• Student 3

• Student 4

Tags

NGSS.MS-PS1-1

(8.5B) A student drew atomic models of four elements. Based on these drawings, which element is the least reactive?

• Neon, because it has two energy levels with eight electrons in the second level.

• Chlorine, because it has three energy levels with seven electrons in the third level.

• Gallium, because it has four energy levels with three electrons in the fourth level.

• Tin, because it has five energy levels with four electrons in the fifth level.

Tags

NGSS.MS-PS1-1

(8.5D) The table shows the chemical formulas for four substances.

Which substances have the same number of carbon atoms?

• Substances 1 and 2.

• Substances 2, 3, and 4

• Substances 2 and 3 only.

• Substances 1 and 3

Tags

NGSS.MS-PS1-1

Look at the table below. It lists the characteristics of three different groups of elements.

The characteristics of metalloids are best represented by-

• Group A only

• Group A & B

• Group B only

• Both Groups B and C

Look at the molecule of glucose below. Glucose is created during photosynthesis.

C₆H₁₂O₆

How many atoms of oxygen are in the compound glucose?

• 6

• 12

• 18

• 24

Tags

NGSS.MS-PS1-1

Look at the diagram.

Which of the following best describes the structure in the atom marked with a C?

• Subatomic particle with an approximate mass of 1amu and a neutral charge

• Subatomic particle with an approximate mass of 1amu and a positive charge

• Subatomic particle with an approximate mass of 0.5amu and a negative charge

• Subatomic particle with an approximate mass of 0.5amu and a positive charge

Tags

NGSS.MS-PS1-1

A student correctly concludes that a molecule has 6 atoms. Which of these substances is the student most likely describing?

• CaCO₃

• NaHCO₃

• H₂O₂

• C₂H₅OH

Tags

NGSS.MS-PS1-1

_(8.5E) A scientist perfomed four investigations using eight different liquids. In each investigation, the scientist combined two of the liquids under a fume hood and recorded observations in the table below.

In which investigation is it least likely that the liquids reacted chemically?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-2