Chemistry review

Front

What is a synthesis reaction?

Back

A synthesis reaction is a type of chemical reaction where two or more simple substances combine to form a more complex product. Example: @@2Mg + O_2 ightarrow 2MgO@@.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Front

How many electrons can the 2nd principal energy level (n=2) hold?

Back

The 2nd principal energy level can hold a maximum of 8 electrons.

Front

Which element is the Noble Gas in period 5?

Back

Xenon (Xe) is the Noble Gas in period 5.

Front

In a solution, what is the substance that causes the dissolving called?

Back

The substance that causes the dissolving is known as the solvent.

Front

What is the mass number of an atom with 10 protons and 15 neutrons?

Back

The mass number is 25, calculated as the sum of protons and neutrons: 10 + 15 = 25.

Front

Define an atom.

Back

An atom is the smallest unit of matter that retains the properties of an element, consisting of protons, neutrons, and electrons.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Front

What is the difference between a solute and a solvent?

Back

A solute is the substance that is dissolved in a solution, while a solvent is the substance that dissolves the solute.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is a chemical equation?

Back

A chemical equation is a symbolic representation of a chemical reaction, showing the reactants and products.

Tags

NGSS.MS-PS1-5

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Tags

NGSS.MS-PS1-5