Pre-Assessment Chemistry

Which of the following is a balanced chemical equation for the reaction between hydrogen gas and oxygen gas to form water?

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DOK Level 1: Recall

CH.PS2.6

Which element has the highest electronegativity?

• Fluorine

• Oxygen

• Nitrogen

• Chlorine

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DOK Level 1: Recall

CH.PS1.1

• 1 mole

• 2 moles

• 0.5 moles

• 4 moles

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DOK Level 2: Skill/Concept

CH.PS1.1.2

Which of the following correctly describes the trend in atomic radius across a period in the periodic table?

• Increases from left to right

• Decreases from left to right

• Remains constant

• Increases and then decreases

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DOK Level 1: Recall

CH.PS1.1

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DOK Level 2: Skill/Concept

CH.PS1.5

Which of the following elements has the smallest atomic radius?

• Sodium (Na)

• Magnesium (Mg)

• Aluminum (Al)

• Silicon (Si)

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DOK Level 1: Recall

CH.PS1.1

Determine the empirical formula of a compound that contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass.

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DOK Level 2: Skill/Concept

CH.PS1.5

Which of the following statements is true about the reactivity of alkali metals?

• Reactivity increases down the group

• Reactivity decreases down the group

• Reactivity remains constant

• Reactivity first increases and then decreases

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DOK Level 1: Recall

CH.PS1.1

Calculate the mass of 0.5 moles of sodium chloride (NaCl). (Molar mass of NaCl = 58.44 g/mol)

• 29.22 grams

• 58.44 grams

• 116.88 grams

• 14.61 grams

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DOK Level 2: Skill/Concept

CH.PS1.5

Which of the following is a characteristic of a chemical reaction?

• Change in color

• Formation of a precipitate

• Evolution of gas

• All of the above

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DOK Level 1: Recall

CH.PS3.4