Safety in Science — Unit test Answers

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

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

Which determines the reactivity of an alkali metal?

Which substance is a mixture?

Which properties are characteristic of metalloids?

Which lists only metalloids?

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

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

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?

Which element is most likely to be shiny?

Which pure substance can be classified as an element?

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

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

The table below lists the properties of a metallic element.

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

Which lists the elements in order from most conductive to least conductive?

This is how sodium appears in the periodic table.

Which property do metalloids share with nonmetals?

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.