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Explanation & Answer

49

a) Ammonium Carbonate

b) Iron Nitrate

50

a) Mg(NO₃)₂

b) CaC₂

51. 30 atoms of oxygen

53.

a) Fe2O3 + CO ----> 2FeO + CO2

b) Ca + Br2-----> CaBr2

c) (NH4)2CO3 => 2NH3 + CO2 + H2O

d) Na + H2O ===> NaOH + ½ H2

54. By definition, aa mole of any substance contains the same number of elementary particles as there are atoms in exactly 12 grams of the ¹²C isotope of carbon. Example: A single ¹²C atom has a mass of 12 amu, and a mole of these atoms would have a mass of 12 grams.

55. the number of atoms or molecules in one mole of a substance, equal to 6.023 × 10²³.

56. There are 6.022 × 10²³ atoms of potassium in every mole of potassium. Since one mole of KOH contains one mole of K, the answer is 6.022×10²³ atoms of K.

57. That means one mole would be 32 grams.
So 16 grammes are:
16 / 32 = 0.5 mole sulfur

58. To calculate the molar mass of the compound, use the atomic weight values for each element on the periodic table. First, you need to count how many of each atom there are. There are 2 Carbon atoms, 6 Oxygen, and 1 Tin: Carbon weighs 12.01 amu; Oxygen weighs 16 amu; and Tin weighs 118.71 amu. Therefore, to get the total molar mass just add them all up:
(2*12.01) + (6*16) + (1*118.71) = 24.02 + 96 + 118.71 = 238.73 g/mol

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The myth of race Video Summary Assignment

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Watch this video (Links to an external site.). It gives an overview of the lab kit (VERY helpful). Take out the components and play along if you like! ⭐️ What is the voltage of your battery?⭐️ To make sure you don't break the multimeter we're going to calculate the minimum resistance that we can connect to the battery. If you want a maximum possible current of 150 mA, what is the smallest resistance you can attach to your battery?⭐️ Create Circuit 1(shown below) using a 20 ohm resistor, your battery, the switch (leave the switch open), and the Ammeter (which is the multimeter set up to measure current). Take a picture of your physical circuit setup and include it here.NOTE: Always check the values of resistors before putting them in the circuit using the Multimeter in Ohmmeter mode. ⟸⟸ Circuit 1⭐️ What is the expected current in this circuit based on Ohm's Law?⭐️ What is the actual current when you close the switch? (don't forget to open the switch after you measure)⭐️ Move the Ammeter in the circuit so that is between the switch and the resistor. What is the current now (when the switch is closed)?⭐️ How do the answers of #6 and #7 compare? Are the answers consistent with your understanding of current?Remove the Ammeter and rebuild the circuit as shown below ⟸⟸ Circuit 1 (without the Ammeter)Watch this brief video on measuring voltage in a circuit (Links to an external site.).⭐️ Change the multimeter to Voltmeter mode (using the 2000 mV range). Close the switch. What is the voltage across (i) the battery, (ii) the switch), and (iii) the resistor?NOTE: Remember the battery voltage is positive and the other ones are negative or zero .⭐️ What does the sum of the voltages add up to? Is it as expected? Explain.Open the switchPART II: 2 Resistor Series CircuitSet up Circuit 2 shown below using a 100 ohm resistor and a 20 ohm resistor. This is 2 resistors in series. ⟸⟸ Circuit 2 ⭐️ Calculate the expected equivalent resistance of this circuit.⭐️ Measure the actual equivalent resistance of this circuit. (make sure the switch is off for this part)⭐️ What do you expect the current to be (i) through the battery, (ii) between the resistors?⭐️ Measure the current at those two points. Is it as expected?⭐️ What do you expect the voltage drop across each resistor to be? Explain.⭐️ Measure the voltage across each resistor. Is it as expected?Open the switchPART III: 2 Resistor Parallel CircuitSet up Circuit 2 shown below using a 100 ohm resistor and a 20 ohm resistor. This is 2 resistors in parallel. ⟸⟸ Circuit 3 ⭐️ Calculate the expected equivalent resistance of this circuit.⭐️ Measure the actual equivalent resistance of this circuit. (make sure the switch is off for this part)⭐️ What do you expect the current to be through (i) the battery, (ii) the 100 ohm resistor (iii) the 20 ohm resistor?⭐️ Measure the current at those three points. Is it as expected?⭐️ What do you expect the voltage drop across each resistor to be? Explain.⭐️ Measure the voltage across each resistor. Is it as expected? Open the switchPART IV: Equivalent resistance of a 4 Resistor CircuitWe're just using resistors and wires for this one: Make up your own circuit using 4 resistors (make sure to choose 4 resistors that aren't too different from each other and don't just put them all in series! )⭐️ Draw a circuit diagram. Include a picture of your circuit diagram here. ⭐️ Calculate the expected equivalent resistance of this circuit. (using resistor addition formulas)⭐️ Measure the actual equivalent resistance of this circuit.