Intro To Chemistry 7th grade

Front

What are the unique characteristics that help identify a substance and distinguish it from another?

Back

Properties

Front

What gas is produced when an ember reignites in a flame test?

Back

Oxygen

Front

In the chemical equation for electrolysis, what are the products of the reaction 2H₂O → 2H₂ + O₂?

Back

H₂ and O₂ are the products.

Front

What can be inferred if a brown powder added to water results in a clear liquid?

Back

The brown powder is soluble in water.

Front

What is a property of chalk that can be observed?

Back

Color

Front

Define a chemical property of a substance.

Back

A chemical property describes a substance's ability to undergo changes that transform it into different substances.

Front

What is the difference between a physical property and a chemical property?

Back

A physical property can be observed without changing the substance's identity, while a chemical property can only be observed during a chemical reaction.

Front

What is the significance of a flame test in chemistry?

Back

A flame test is used to identify the presence of certain metal ions based on the color of the flame produced.

Front

What does solubility refer to in chemistry?

Back

Solubility is the ability of a substance to dissolve in a solvent, forming a solution.

Front

What is the definition of a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction.