Elements, Compounds, and Mixtures — Unit test

Question 1

Which physical method can separate a mixture of steel ball bearings and marbles?

Revolt · Accepted Answer

sorting

Question 2

Which shows the electron configuration for Silicon (Si)?

Revolt · Accepted Answer

[Ne]3s23p2

Question 3

Which of these properties is the best one to use for identification of an element?

Revolt · Accepted Answer

the number of protons in the atomic nucleus

Question 4

Which property would xenon most likely have?

Revolt · Accepted Answer

It is stable.

Question 5

Which element has an ion that is smaller than an ion of calcium?

Revolt · Accepted Answer

magnesium

Question 6

The symbol for xenon (Xe) would be a part of the noble gas notation for the element

Revolt · Accepted Answer

cesium.

Question 7

Which best describes the trends in electronegativity on the periodic table?

Revolt · Accepted Answer

Electronegativity increases up and to the right.

Question 8

What is the electron configuration of chlorine (Cl)?

Revolt · Accepted Answer

1s22s22p63s23p5

Question 9

Which of the following observations would indicate that a material is a pure substance?

Revolt · Accepted Answer

It cannot be physically broken down into different types of atoms.

Question 10

Which element would most likely have chemical properties similar to that of magnesium (Mg)?

Revolt · Accepted Answer

Ca

Elements, Compounds, and Mixtures — Unit test Answers