Elements, Compounds, and Mixtures

Question 1

Which of the following did Antoine Lavoisier correctly characterize as an element?

Revolt · Accepted Answer

C: mercury

Question 2

Why did Mendeleev leave blank spaces in his version of the periodic table?

Revolt · Accepted Answer

C: Mendeleev’s periodic table arranged elements in order of increasing atomic mass; it was noticed that chemical properties repeated. Mendeleev predicted an element had not been discovered to fit the space.

Question 3

Organized elements into four groups based on properties:

Revolt · Accepted Answer

A: Lavoisier

Question 4

From the list below, choose which groups are part of the periodic table.

Revolt · Accepted Answer

A: metals; D: nonmetals; E: semimetals

Question 5

Rb:

Revolt · Accepted Answer

A: alkali metal

Question 6

Use the periodic table to choose the element that matches each description.halogen:

Revolt · Accepted Answer

B: iodine

Question 7

Magnesium (Mg):

Revolt · Accepted Answer

A: less reactive than sodium

Question 8

Nickel (Ni):

Revolt · Accepted Answer

A: forms colorful compounds

Question 9

Which of the following did Antoine Lavoisier incorrectly characterize as matter?

Revolt · Accepted Answer

A: light

Question 10

Developed the law of octaves:

Revolt · Accepted Answer

C: Newlands

Elements, Compounds, and Mixtures Answers

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