Bacola Benchmark Review December 2023

Front

What is the atomic number of chlorine?

Back

The atomic number of chlorine is 17, which means it has 17 protons.

Front

How many known elements are there in the periodic table?

Back

Approximately 100 known elements have been identified.

Front

What is an independent variable in an experiment?

Back

An independent variable is the factor that is changed or controlled in a scientific experiment to test its effects on the dependent variable.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H₂O.

Front

What is a dependent variable in an experiment?

Back

A dependent variable is the factor that is measured or observed in an experiment.

Front

What does the term 'element' mean in chemistry?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is the significance of protons in an atom?

Back

Protons determine the atomic number of an element and its identity.

Front

What is the role of a hypothesis in scientific experiments?

Back

A hypothesis is a proposed explanation for a phenomenon, which can be tested through experimentation.

Front

What is the difference between a chemical formula and a chemical equation?

Back

A chemical formula represents the elements in a compound, while a chemical equation shows the reactants and products in a chemical reaction.

Front

What is the process of photosynthesis?

Back

Photosynthesis is the process by which green plants use sunlight to synthesize foods with the help of chlorophyll.