The video tutorial explains how to balance chemical equations by adjusting coefficients to adhere to the law of conservation of mass. It uses examples like the reaction of nitrogen and hydrogen to form ammonia, the separation of water, and the combustion of methane. The tutorial also introduces tools like balance scales and bar graphs to help visualize the balancing process. Finally, it includes a game to practice balancing equations without tools.

Why is it important to balance chemical equations?

• To reduce the number of reactants.

• To increase the number of products.

• To make the equations look neat.

• To ensure the law of conservation of mass is followed.

Tags

NGSS.MS-PS1-5

What tool is suggested for balancing chemical equations in the tutorial?

• A calculator

• A periodic table

• A PhET simulation

• A molecular model kit

In the formation of ammonia, what must be adjusted to balance the equation?

• The number of oxygen atoms

• The number of ammonia molecules

• The number of hydrogen atoms only

• The number of nitrogen atoms only

Tags

NGSS.MS-PS1-5

When balancing the formation of ammonia, why can't you add a single nitrogen atom?

• Because nitrogen is too reactive

• Because nitrogen is a noble gas

• Because nitrogen is not present in the reactants

• Because nitrogen always comes as N2

Tags

NGSS.MS-PS1-1

What happens if you add another water molecule when balancing the separation of water?

• It has no effect on the balance

• It unbalances both hydrogen and oxygen

• It balances both hydrogen and oxygen

• It balances the oxygen but unbalances the hydrogen

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

In the separation of water, what are the correct coefficients for the balanced equation?

• 1 in front of water, 2 in front of hydrogen, 1 in front of oxygen

• 1 in front of water, 1 in front of hydrogen, 2 in front of oxygen

• 2 in front of water, 2 in front of hydrogen, 1 in front of oxygen

• 2 in front of water, 1 in front of hydrogen, 2 in front of oxygen

Tags

NGSS.MS-PS1-5

Why is balancing the combustion of methane more complicated?

• Because it involves only one reactant

• Because it does not follow the law of conservation of mass

• Because it involves more reactants and products

• Because it involves only one product

Tags

NGSS.MS-PS1-5

When balancing the combustion of methane, which element is suggested to be balanced last?

• Carbon

• Hydrogen

• Oxygen

• Nitrogen

Tags

NGSS.MS-PS1-5

In the game mode, what must you do to check if your equation is balanced?

• Use the bar graph tool

• Use the balance tool

• Ask the teacher

• Count the atoms yourself and check

What happens if your equation is not balanced in the game mode?

• You will lose points

• You will have to try again

• You will get a hint

• The game will end

Tags

NGSS.MS-PS1-5