{{asɛmtiNe Ɔkyerɛwfo}} | Nhomakorabea | Nneɛma a ɛma wotumi yɛ ade

10

Match the following grams of parent isotope remaining after the following time periods (rounded to 3 significant digits) (Note, Column 3 is the half-life)

Draggable item		Corresponding Item
When 8 g of I-131 decays for 16.1 days		1 g
When 8 g of Ir-192 decays for 295 days		2 g
When 16 g of Pu-238 decays for 87.7 years		4 g
When 16 g of Cs-137 decays for 60.4 years		0.5 g
When 32 g of Co-60 decays for 26.4 years		8 g

18

After looking at the following Isotopes, which of the statements below is true (one or more may be true)

The Oxygen isotope shown has 8 neutrons

The Magnesium isotope shown has 24 protons

The Neon isotope shown has 10 neutrons

The Helium isotope shown has the same number of neutrons as protons

The Nitrogen isotope shown has the same number of neutrons as the Boron isotope shown

Using a periodic table, you can find that the average number of neutrons in Potassium is 10.1 (rounded to 3 significant figures

Using a periodic table, you can find that the average number of neutrons in Boron is 5.2 (rounded to 3 significant figures

Using a periodic table, you can find that the average number of neutrons in Mg is 12.3 (rounded to 3 significant figures

Using a periodic table, you can find that the average number of neutrons in Copper is 35.5 (rounded to 3 significant figures

10

The following statements are true of which type of radiation

Is responsible for the loss in mass when Polonium 212 decays to Lead 208
Is responsible for the increase in atomic number when Carbon 14 decays to Nitrogen 14
Is the highest energy radiation emitted when Uranium 238 decays to Thorium 234
Does not have mass
Is the nucleus of a Helium atom

Alpha radiation
Beta radiation
Gamma rays

9

There are 5 g of Boron in one mole of Boron Nitrate

There are three Oxygen and one Nitrogen in each Nitrate (NO₃)

There are two Nitrates in each Boron Nitrate (NO₃)

To find the molar mass of Boron Nitrate, we would take 10.8 + (14.0 + (3 x 16.0)) x 3

The molar mass of Boron Nitrate is 197 g / mol

To find the moles of Boron in 1.97 g of B(NO₃)₃we would divide 1.97g / 197 g /mol

There are 0.010 moles of Boron in 1.97 g of Boron Nitrate

To find the number of Boron atoms in 1.97 g of Boron Nitrate we would multiply 0.050 moles x 6.02 x 10²³ atoms/mole

The number of Boron atoms in 6.02 g of Boron Nitrateis 6.02 x 10²¹ atoms.

10

Using the template below, find the mass of 0.50 moles of N₂O in grams. (all numbers are rounded to 3 significant digits)

Draggable item		Corresponding Item
Molar Mass of N₂O		14.0 g
Mass of 0.50 moles of Carbon Dioxide		16.0 g
Molar Mass of a mole of Nitrogen atoms		28.0 g
Molar Mass of a mole of Oxygen atoms		44.0 g
Mass of Nitrogen in one mole of N₂O		22.0 g

8

Using the Pie Chart below, check which elements have the correct number of atoms of that that element you could find in one mole of Adenosine. (Rounded to three significant figures)

There are 6.02 x 10²⁴ atoms of Carbon in one mole of Adenosine

There are 7.83 x 10²⁴ atoms of Hydrogen in one mole of Adenosine

There are 5.00 x 10²⁴ atoms of Nitrogen in one mole of Adenosine

There are 2.41 x 10²⁴ atoms of Oxygen in one mole of Adenosine

9

155 g Histidine x .46 = 71.3 g C (rounded to 3 significant digits)

155 g Histidine x .06 = 9.3 g H (rounded to 3 significant digits)

155 g Histidine x .27 = 41.9 g N (rounded to 3 significant digits)

155 g Histidine x .21 = 32.6 g O (rounded to 3 significant digits)

71.3 g C / (12.0 g/mol) = 5.94 mol, which rounds to 6

9.3 g H / (1.01 g/mol) = 9.3 mol, which rounds to 10

41.9 g N / (14.0 g/mol) =2.99 mol, which rounds to 2

32.6 g O / (16.0 g/mol) =2.03 mol, which rounds to 3

The Molecular formula of Histidine is C₆H₉N₃O₂

8

How many of each of the following elements are in the amino acid Glutamine. The molar mass is 146 g/mol (rounded to 3 significant digits)
Carbon
C
41%
Hydrogen
H
7%
Nitrogen
N
19%
Oxygen
O
33%

Draggable item		Corresponding Item
Hydrogen		5
Nitrogen		None of the above
Oxygen		2
Carbon		3

10

Match the following facts with the part of the equation that tells you that fact.

Draggable item		Corresponding Item
Nitrogen is a gas		(aq)
There are two Hydrogen in H₂O		(g)
This reaction will produce two water molecules		(l)
Water is a liquid		The 2 after the H
Nitrogen Dioxide is dissolved in water		The 2 before the H

8

Balance the following equation and select which statements are true.

Lead Hydroxide has two Oxygen

Lead Chloride has two Chlorine

The Equation above is Balanced

The mole ratio of Lead Hydroxide to Lead Chloride will be 1:1

The mole ratio of Water to Lead Chloride will be 1:1

The mass of 2 moles of HCl is 36.5g

1 mole of Lead Hydroxide can make 3 moles of water

36.5 g of HCl can react with Lead Hydroxide to make 18 g of water.

Exam 2

Exam 2

Match the following grams of parent isotope remaining after the following time periods (rounded to 3 significant digits) (Note, Column 3 is the half-life)

After looking at the following Isotopes, which of the statements below is true (one or more may be true)

The following statements are true of which type of radiation

Using the template below, find the mass of 0.50 moles of N₂O in grams. (all numbers are rounded to 3 significant digits)

Using the Pie Chart below, check which elements have the correct number of atoms of that that element you could find in one mole of Adenosine. (Rounded to three significant figures)

How many of each of the following elements are in the amino acid Glutamine. The molar mass is 146 g/mol (rounded to 3 significant digits)
Carbon
C
41%
Hydrogen
H
7%
Nitrogen
N
19%
Oxygen
O
33%

Match the following facts with the part of the equation that tells you that fact.

Balance the following equation and select which statements are true.

Match the following grams of parent isotope remaining after the following time periods (rounded to 3 significant digits) (Note, Column 3 is the half-life)

After looking at the following Isotopes, which of the statements below is true (one or more may be true)

The following statements are true of which type of radiation

Which of the following statements are true and are steps needed to answer the following question: How many atoms of Boron are in are in 1.97g of Boron Nitrate, B(NO₃)₃. (all numbers are rounded to 3 significant digits). You may use scratch paper and the following template if you wish.

Using the template below, find the mass of 0.50 moles of N₂O in grams. (all numbers are rounded to 3 significant digits)

Using the Pie Chart below, check which elements have the correct number of atoms of that that element you could find in one mole of Adenosine. (Rounded to three significant figures)

How many of each of the following elements are in the amino acid Glutamine. The molar mass is 146 g/mol (rounded to 3 significant digits)
Carbon
C
41%
Hydrogen
H
7%
Nitrogen
N
19%
Oxygen
O
33%

Match the following facts with the part of the equation that tells you that fact.

Balance the following equation and select which statements are true.

Exam 2

Exam 2

Match the following grams of parent isotope remaining after the following time periods (rounded to 3 significant digits) (Note, Column 3 is the half-life)

After looking at the following Isotopes, which of the statements below is true (one or more may be true)

The following statements are true of which type of radiation

Using the template below, find the mass of 0.50 moles of N2O in grams. (all numbers are rounded to 3 significant digits)

Using the Pie Chart below, check which elements have the correct number of atoms of that that element you could find in one mole of Adenosine. (Rounded to three significant figures)

How many of each of the following elements are in the amino acid Glutamine. The molar mass is 146 g/mol (rounded to 3 significant digits)CarbonC41%HydrogenH7%NitrogenN19%OxygenO33%

Match the following facts with the part of the equation that tells you that fact.

Balance the following equation and select which statements are true.

Match the following grams of parent isotope remaining after the following time periods (rounded to 3 significant digits) (Note, Column 3 is the half-life)

After looking at the following Isotopes, which of the statements below is true (one or more may be true)

The following statements are true of which type of radiation

Which of the following statements are true and are steps needed to answer the following question: How many atoms of Boron are in are in 1.97g of Boron Nitrate, B(NO3)3. (all numbers are rounded to 3 significant digits). You may use scratch paper and the following template if you wish.

Using the template below, find the mass of 0.50 moles of N2O in grams. (all numbers are rounded to 3 significant digits)

Using the Pie Chart below, check which elements have the correct number of atoms of that that element you could find in one mole of Adenosine. (Rounded to three significant figures)

How many of each of the following elements are in the amino acid Glutamine. The molar mass is 146 g/mol (rounded to 3 significant digits)CarbonC41%HydrogenH7%NitrogenN19%OxygenO33%

Match the following facts with the part of the equation that tells you that fact.

Balance the following equation and select which statements are true.

Using the template below, find the mass of 0.50 moles of N₂O in grams. (all numbers are rounded to 3 significant digits)

How many of each of the following elements are in the amino acid Glutamine. The molar mass is 146 g/mol (rounded to 3 significant digits)
Carbon
C
41%
Hydrogen
H
7%
Nitrogen
N
19%
Oxygen
O
33%

Which of the following statements are true and are steps needed to answer the following question: How many atoms of Boron are in are in 1.97g of Boron Nitrate, B(NO₃)₃. (all numbers are rounded to 3 significant digits). You may use scratch paper and the following template if you wish.

Using the template below, find the mass of 0.50 moles of N₂O in grams. (all numbers are rounded to 3 significant digits)

How many of each of the following elements are in the amino acid Glutamine. The molar mass is 146 g/mol (rounded to 3 significant digits)
Carbon
C
41%
Hydrogen
H
7%
Nitrogen
N
19%
Oxygen
O
33%