Which of the following is evidence that a chemical change has occurred?

Formation of a precipitate, color change, release of gas, or absorption of heat

According to the periodic table, the group known as the halogens include the element:

Fluorine, chlorine, bromine, iodine, and astatine

Oxygen, nitrogen, carbon, hydrogen, and helium

Sodium, potassium, magnesium, calcium, and iron

Mercury, lead, arsenic, uranium, and plutonium

The noble gases, such as helium and xenon, are non-reactive because:

They have a full outer electron shell.

They have a half-full outer electron shell.

They have a strong attraction to other elements.

They have a high reactivity with other elements.

The noble gases such as helium and xenon do not form chemical bonds with other elements because they:

have a full outer electron shell

have a high reactivity with other elements

have a strong attraction to other elements

Which statement is TRUE about elements in group 16?

They have an oxidation number of 2-.

They need 6 electrons to complete their octet.

They have an oxidation number of 2+.

How many atoms of aluminum (Al), sulfur (S), and oxygen (O) are in each molecule of Al2(SO4)3?

2 atoms of Al, 3 atoms of S, and 12 atoms of O

3 atoms of Al, 2 atoms of S, and 9 atoms of O

4 atoms of Al, 3 atoms of S, and 10 atoms of O

2 atoms of Al, 4 atoms of S, and 11 atoms of O

Which statement best explains why atoms form chemical bonds with other atoms?

To achieve a more stable and lower energy state.

In which of the following situations does water undergo a change in physical properties?

The neighbor's pond freezes over in winter AND The bathroom fills with steam when you take a hot shower.

The neighbor's pond freezes over in winter.

The bathroom fills with steam when you take a hot shower.

Water is broken down to yield H2 and O2.

Of the following, the one which most likely involves a chemical reaction is:

Placing a solid and a liquid together produces heat and a gas.

Heating an ice cube produces liquid water.

. Hitting a board with a hammer forms a dent in the surface of the wood.

Slicing a piece of bread produces two pieces.

The principle of conservation of atoms is satisfied in a chemical equation when:

The number of atoms of each element is the same on both sides of the equation.

The number of atoms of each element is not balanced.

The chemical equation involves only one element.

The number of atoms of each element is different on both sides of the equation.

Of the following equations, the one which is NOT balanced is:

2HCl + Ca(OH)2 → CaCl2 + 2H2O

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Classify the following reaction: CH4 + 2 O2 → CO2 + 2 H2O

Most of the elements in the periodic table can be described as:

A way of organizing the elements based on their chemical properties is the:

A period’s number on the periodic table corresponds to the number of:

Horizontal rows on the periodic table are called:

Characteristics of non-metals include all of the following EXCEPT:

The location of metals on the periodic table is on the:

An atomic mass unit is the approximate mass of a single:

An example of a metalloid, elements with properties between metals and non-metals, is

How many energy levels are filled in a krypton atom?

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