Unit Test Answers

Which physical method can be used for obtaining a sample of salt from a small beaker of salt water?

What trend does the reactivity of most nonmetals show in a periodic table, excluding the noble gases?

This is how sodium appears in the periodic table.

Cecil is working with samples of chlorine (Cl), oxygen (O), bromine (Br), and silver (Ag). The samples are all at room temperature. Which substance is most likely the most dense?

Which element is most likely to be shiny?

Which properties make a metal a good material to use for electrical wires?

Which pure substance can be classified as an element?

The elements in group 17 of the periodic table are all called halogens. All halogens have the same

Which substance is a mixture?

Who is known as the "father of modern chemistry” because he first organized all known elements into four different groups?

While looking at xenon (Xe) on the periodic table, a student needs to find an element with a smaller atomic mass in the same group. Where should the student look?

Air is made up of different gases, such as oxygen, nitrogen, and carbon dioxide. Which statement best describes these three components of air?

Joelle is a manager at a construction company, and she is interested in the chemistry behind the materials they use. She has begun studying the materials used to fill walls. She knows that to keep the temperature inside a room steady the material must be a thermal insulator, and she predicts that materials should not be acidic or else they would dissolve too easily in water.

The elements least likely to form bonds are found in which group?

The table below lists the properties of a metallic element.

Which determines the reactivity of an alkali metal?

Which sample is a pure substance?

This is how osmium appears in the periodic table.

Which element is most likely to bend without breaking?

Elements in group 2 are all called alkaline earth metals. What is most similar about the alkaline earth metals?

Which element has a complete valence electron shell?

Krypton is named after the Greek word that means “secret.” Which explains why krypton was most likely given this name?

Based on the information in the table, which elements are most likely in the same periods of the periodic table?

Which statement correctly compares an atom of an alkali metal with an atom of the alkaline earth metal next to it on the periodic table?

Which cannot be chemically broken down into simpler substances?