Unit Test — Unit test Answers

Calcium, magnesium, and strontium are near each other on the periodic table and have some characteristics in common, but they differ in chemical reactivity. Which lists these metals in order from most reactive to least reactive?

Which statement describes heterogeneous mixtures?

A piece of sodium metal can be described as

What best describes the states of nonmetals when they are at room temperature?

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

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

Which metal is most likely to form more than one kind of positively charged ion?

Which element is most likely to carry electric current easily?

These models show the electron structures of two different nonmetal elements.

Who was the first chemist to organize elements by atomic number?

This is how manganese appears in the periodic table.

Where are alkaline earth metals found on the periodic table?

The atomic number of beryllium (Be) is 4, and the atomic number of barium (Ba) is 56. Which comparison is best supported by this information?

While looking at bromine (Br) on the periodic table, a student needs to find another element with very similar chemical properties but with a different atomic mass. Which best describes the student’s options?

Sonya is studying a nonmetal element. She learns that the element is like other elements in its group because it can bond to form a salt or an acid. She also learns that the element is the most reactive element in its group. Which element is Sonya most likely studying?