Amount Of Substances

• What is the mole in chemistry?

  The mole is a way of measuring the amount of substance in chemistry.
• What is Avogadro's number?

  Avogadro's number is $6.02 \times 10^{23}$.
• How many molecules are in one mole of water?

  One mole of water contains $6.02 \times 10^{23}$ molecules of water.
• How can you calculate the number of particles in a substance?

  You multiply Avogadro's number by the number of moles.
• What is the formula to calculate the number of particles?

  The formula is number of particles = Avogadro's number × number of moles.
• How many particles are in 0.67 moles of ammonia?

  Number of particles = $6.02 \times 10^{23} \times 0.67$.
• What is the formula for calculating the number of moles using mass?

  The formula is number of moles = mass (g) / molar mass (g/mol).
• How do you calculate the number of moles in 23 g of gold?

  Number of moles = $23 \text{ g} / 197 \text{ g/mol} =$$0.12 \text{ moles}$.
• What should you do if you need to rearrange the formula for moles?

  You should look for any two of the components: moles, mass, or molar mass.
• How can you calculate the number of moles in a solution?

  By using the formula: number of moles = concentration (mol/dm³) × volume (dm³).
• What is the importance of converting volume to decimeters cubed?

  Volume must be in decimeters cubed to use the moles formula correctly.
• How do you convert 200 cm³ to dm³?

  Divide by 1000 to convert 200 cm³ to 0.2 dm³.
• How do you calculate the number of moles of 200 cm³ of 35 mol/dm³ HCl?

  Number of moles = $0.35 \text{ mol/dm}^3 \times 0.2 \text{ dm}^3 =$$0.07 \text{ moles}$.
• What is the ideal gas equation?

  The ideal gas equation is $PV =$$nRT$.
• What does P represent in the ideal gas equation?

  P represents pressure measured in pascals.
• What does V represent in the ideal gas equation?

  V represents volume measured in meters cubed.
• What does n represent in the ideal gas equation?

  n represents the number of moles.
• What does T represent in the ideal gas equation?

  T represents temperature measured in Kelvin.
• What does R represent in the ideal gas equation?

  R represents the gas constant, which is $8.31 \text{ J/(K mol)}$.
• How do you convert temperature from degrees Celsius to Kelvin?

  Add 273 to the degrees Celsius temperature.
• How do you calculate the volume of a gas using the ideal gas equation?

  Rearrange the equation to $V =$$\frac{nRT}{P}$.
• How do you convert from meters cubed to centimeters cubed?

  Multiply by 1,000,000 to convert from meters cubed to centimeters cubed.
• What is the general rule for converting between different units of measurement?

  For every dimension, you add a zero from the previous dimension.
• How do you convert from meters squared to centimeters squared?

  Multiply by 10,000 to convert from meters squared to centimeters squared.
• How do you convert from decimeters squared to centimeters squared?

  Multiply by 100 to convert from decimeters squared to centimeters squared.
• Why is it important to convert units in chemistry?

  It ensures that calculations are accurate and consistent with standard units.
• How do you convert meters to decimeters?

  Multiply by 100
• How do you convert decimeters to centimeters?

  Multiply by 10
• What is the relationship between meters, decimeters, and centimeters?

  There are 10 decimeters in a meter and 100 centimeters in a meter
• How do you convert from meters squared to decimeters squared?

  Multiply by 100
• How do you convert from meters cubed to decimeters cubed?

  Multiply by 1,000
• What is the conversion factor from meters cubed to centimeters cubed?

  Multiply by 1,000,000
• What are spectator ions in ionic equations?

  They are ions that do not participate in the reaction
• What is the general form of a balanced equation for an acid reacting with a base?

  Acid + Base → Salt + Water
• What are the state symbols used in chemical equations?

  S for solid, L for liquid, G for gas, AQ for aqueous
• How do you calculate the theoretical mass produced in a reaction?

  Use the balanced equation and molar masses
• How do you find the number of moles from mass and atomic mass?

  Divide mass by atomic mass
• What is the formula to calculate the volume of a gas using moles?

  V = nRT/P
• How do you convert pressure from kilopascals to pascals?

  Multiply by 1,000
• What is the purpose of titration in chemistry?

  To determine the concentration of an acid or alkali