Explanation

• A chemical change, also known as a chemical reaction.
• It is a process that alters the composition of one or more substances, resulting in the formation of new substances with different properties.

Explanation

A change in physical appearance or state of a substance, such as a change in shape, size, color, or phase (solid, liquid, gas), is called a Physical Change.

Explanation

• A release of gas is typically a sign of a chemical change, not a physical change.

The signs of physical change:

• Change that can be reversed
• The substance does not turn into a new substance

Explanation

• A chemical formula tells us the number of atoms of each element in a compound.
• It contains the symbols of atoms of the elements present in the compound.
• As well as how many there are for each element, in the form of subscripts.

Explanation

• Lead-210 is used to determine the accumulation rates of pollutants in layers of soil.
• It helps in studying sedimentation rates and the historical deposition of pollutants.

Explanation

• Carbon-14 is used to investigate carbon uptake and biochemical pathways in plants.
• It is a radioactive isotope that allows researchers to trace carbon through various metabolic processes.

Explanation

• Phosphorus-32 is used to study the uptake of phosphorus-containing fertilizers.
• This radioactive isotope helps in tracing and measuring the absorption and movement of phosphorus within plants.

Explanation

• Phosphorus-32 is used to identify the efficiency rates of organic and inorganic fertilizers.
• It is a radioactive isotope that helps track the uptake and utilization of phosphorus by plants.

Explanation

• Deuterium, also known as heavy hydrogen.
• It has 1 proton and 1 neutron in its atomic nucleus.

Explanation

• Protium is the lightest and most abundant isotope of hydrogen.
• It has only 1 proton in its atomic nucleus.