Chemistry Exam 1 Study Guide (No Math Questions) II

How many significant figures are in 1.3070 g?

5

An oxide ion, O²⁻, has:

8 protons and 10 electrons

How many protons are there in an atom of uranium whose mass number is 235?

92

An atom of helium has a mass about four times greater than that of an atom of hydrogen. Which choice makes the correct comparison of the relative numbers of helium and hydrogen atoms in equal masses of the two elements?

There are about one-fourth as many helium atoms as hydrogen atoms.

An atom of bromine has a mass about four times greater than that of an atom of neon. Which choice makes the correct comparison of the relative numbers of bromine and neon atoms in 1,000 g of each element?

There are four times as many neon atoms as bromine atoms

An anion is defined as

a charged atom or group of atoms with a net negative charge.

An object sinks when placed in water if the mass of the object is greater than the mass of the water that the object displaces. Which of the following objects will sink when dropped into a bucket of water? (Given: density of water = 1.00 g/cm3)

a chunk of sodium (density = 0.91 g/cm³)

Elements in a column of periodic table are

a group.

A tentative explanation for a set of observations that can be tested by further experimentation is referred to as

a hypothesis.

Complete the following sentence. A scientific law is

a statement describing a relationship between phenomena that is ALWAYS the SAME under the SAME CONDITIONS.

Two isotopes of an element differ in their

atomic mass

The correct name for Ba(OH)₂ is

barium hydroxide

Name the binary compound formed between barium and phosphorus.

barium phosphide

Which of the element is chemically similar to potassium?

cesium

The Stock system name for Co₂(SO₃)₃ is:

cobalt(III) sulfite

Example of a physical property?

ice floats on top of liquid water

Example of physical change?

water, when heated to 100°C, forms steam

NOT a chemical change?

when cooled to 0°C, liquid water becomes ice