JV Chemistry Practice

In chemistry, a synthesis reaction occurs when:

• A single compound breaks into two or more products

• Two or more substances combine to form one compound

• Heat causes a reaction to speed up

• Oxygen reacts with a hydrocarbon

A double replacement reaction involves:

• The exchange of ions between two compounds

• The burning of a substance in oxygen

• The decomposition of a compound into simpler elements

• The transfer of electrons between a metal and a nonmetal

In a single replacement reaction, one element replaces another because:

• It has higher reactivity

• It has lower density

• It is a noble gas

• It forms hydrogen bonds

In terms of electrons, oxidation is defined as:

• Gain of electrons

• Loss of electrons

• Sharing of electrons

• Equal distribution of electrons

A combustion reaction usually produces:

• Oxygen and water

• Carbon dioxide and water

• Hydrogen and nitrogen

• Carbon monoxide and chlorine

A decomposition reaction is the opposite of:

• Combustion

• Synthesis

• Oxidation

• Double replacement

The element potassium (K) is classified as:

• An alkaline earth metal

• A halogen

• An alkali metal

• A transition metal

The element lead (Pb) was once commonly used in:

• Food preservation

• Gasoline additives

• Plastic production

• Fertilizers

The metal gold (Au) is considered chemically stable because:

• It oxidizes rapidly

• It resists corrosion and tarnish

• It reacts with noble gases

• It decomposes easily

Silver (Ag) is particularly known for:

• Low reactivity with acids

• Strong nuclear stability

• High electrical conductivity

• Large atomic radius