Conservation Mass and Reactions Quiz

What does a chemical reaction involve?

• The formation of new substances

• The destruction of matter

• The transfer of energy

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What does the law of conservation of mass state?

• Matter cannot be created or destroyed in a chemical reaction

• Energy is always conserved in a chemical reaction

• Mass is doubled in a chemical reaction

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NGSS.MS-PS1-5

How can we represent this using an equation?

• By balancing the chemical equation

• By multiplying the reactants and products

• By changing the state symbols

Give an example when the products appear to have lost mass.

• Burning wood

• Dissolving sugar in water

• Melting ice

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What needs to be done when balancing equations?

• Ensuring there are equal numbers of atoms on both sides

• Adding more reactants to the equation

• Ignoring the coefficients

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NGSS.MS-PS1-5

What is the definition for relative atomic mass Ar?

• The mass of an atom relative to carbon-12

• The number of protons in an atom

• The mass of an atom in grams

Which number in the periodic table is the relative atomic mass when taking into account all the isotopes on Earth?

• A) Atomic number

• B) Mass number

• C) Relative atomic mass

What is the mass of one mole of a substance in grams numerically equal to?

• A) Avogadro's constant

• B) The molar mass

• C) The relative atomic mass

What do we call the number of atoms, molecules, or ions in a mole of a given substance?

• A) Avogadro's constant

• B) The molar mass

• C) The number of moles

Tags

NGSS.HS-PS1-7

What is the value for Avogadro's constant?

• A) 6.022 x 10^23

• B) 2.998 x 10^8

• C) 9.81 m/s^2