Chemistry Molar Mass and Conversion Factors
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Questions and Answers

What is the standard form of 0.0038?

  • 38 × 10^-2
  • 3.8 × 10^3
  • 3.8 × 10^2
  • 38 × 10^-3 (correct)
  • If you move the decimal point in a decimal two places to the right, what should you do?

  • Multiply by 10^-3
  • Multiply by 10^3
  • Multiply by 10^2
  • Multiply by 10^-2 (correct)
  • In the standard form, what is the characteristic if n = 7.5 × 10^-2?

  • 2
  • -2 (correct)
  • -1
  • 1
  • What is the standard form of 0.000025?

    <p>25 × 10^-5</p> Signup and view all the answers

    If you move the decimal point in a decimal three places to the left, what should you do?

    <p>Multiply by 10^3</p> Signup and view all the answers

    For a decimal in standard form, what range does the mantissa 'm' belong to?

    <p>(0, 1)</p> Signup and view all the answers

    What is the equivalent of 1 joule in ergs?

    <p>1 ´ 10^7 ergs</p> Signup and view all the answers

    How many grams are in a metric tonne?

    <p>1000 grams</p> Signup and view all the answers

    What is the equivalent of 1 mile in kilometers?

    <p>1.609 kilometers</p> Signup and view all the answers

    How many quarts are in a gallon?

    <p>4 quarts</p> Signup and view all the answers

    What is the equivalent of 1 British thermal unit in joules?

    <p>1055.06 joules</p> Signup and view all the answers

    How many feet are in a kilometer?

    <p>3280 feet</p> Signup and view all the answers

    What is the amount of heat required to raise the temperature of 5 grams of water from 15.50°C to 20.50°C?

    <p>15 cal</p> Signup and view all the answers

    If the specific heat of a substance is 0.5 cal/g°C, how much heat is needed to raise the temperature of 10 grams by 10°C?

    <p>100 cal</p> Signup and view all the answers

    How much energy is required to raise the temperature of 2 moles of water by 5 K? (Given: 1 cal = 4.184 J)

    <p>167.36 J</p> Signup and view all the answers

    If a substance has a specific heat of 25 J/kg°C, how much energy is required to raise the temperature of 2 kg by 10°C?

    <p>1000 J</p> Signup and view all the answers

    What is the mass of a substance that requires 5000 J of energy to raise its temperature by 20°C if its specific heat is 0.1 J/g°C?

    <p>2500 g</p> Signup and view all the answers

    How many kilocalories are needed to raise the temperature of 1 kg of water by 20 K? (Given: 1 kcal = 4184 J)

    <p>41.84 kcal</p> Signup and view all the answers

    If a substance has a specific heat of 0.05 kcal/kg°C, how much energy is required to raise the temperature of 5 kg by 100 K?

    <p>125 kcal</p> Signup and view all the answers

    What is the weight of a substance that requires 1000 calories of energy to increase its temperature by 10°C if its specific heat is 0.5 cal/g°C?

    <p>4 g</p> Signup and view all the answers

    How many joules are needed to heat 500 grams of a substance with a specific heat of 20 J/kg°C by 30°C?

    <p>300,000 J</p> Signup and view all the answers

    What is the amount of heat energy needed to raise the temperature of 2 moles of a substance by 15 degrees Celsius if its specific heat capacity is 30J/mol°C?

    <p>54000 J</p> Signup and view all the answers

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