8th Grade Science 1st semester

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. The total mass of the reactants equals the total mass of the products.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

How do you calculate mass using force and acceleration?

Back

Mass can be calculated using the formula: Mass = Force / Acceleration. For example, if a force of 40 newtons causes an acceleration of 8 m/s², the mass is 5 kg.

Front

What is cohesion in terms of water molecules?

Back

Cohesion is the property of water molecules that allows them to stick to each other due to hydrogen bonding, which is why water forms droplets.

Front

How is an element represented in chemical notation?

Back

An element is represented by a one or two-letter symbol, where the first letter is always capitalized and the second letter, if present, is lowercase.

Front

What does it mean for a chemical equation to be balanced?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved.

Tags

NGSS.MS-PS1-5

Front

What is the formula for calculating acceleration?

Back

Acceleration can be calculated using the formula: Acceleration = Force / Mass.

Tags

NGSS.MS-PS2-2

Front

What is the difference between adhesion and cohesion?

Back

Adhesion is the attraction between different substances, while cohesion is the attraction between similar substances, such as water molecules.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another, involving the breaking and forming of bonds.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is the significance of the coefficients in a chemical equation?

Back

Coefficients indicate the number of molecules or moles of each reactant and product involved in the reaction, helping to balance the equation.

Tags

NGSS.MS-PS1-5

Front

What is the role of a catalyst in a chemical reaction?

Back

A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process.

Tags

NGSS.HS-PS1-5