Homework from page 104.

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Presentation transcript:

Homework from page 104

Homework from page 104 Boron has two isotopes. boron-10 mass = 10.013 amu abundance = 19.8% Boron-11 mass = 11.009 amu abundance = 80.2% Calculate its atomic mass.

Homework from page 104 (mass x abundance) + (mass x abundance) boron-10 mass = 10.013 amu abundance = 19.8% Boron-11 mass = 11.009 amu abundance = 80.2%

Homework from page 104 (mass x abundance) + (mass x abundance) boron-10 mass = 10.013 amu abundance = 19.8% Boron-11 mass = 11.009 amu abundance = 80.2%

Homework from page 104 (mass x abundance) + (mass x abundance) 10.013 amu x 19.8% 11.009 amu x 80.2%

Homework from page 104 (mass x abundance) + (mass x abundance) 10.013 amu x .198 11.009 amu x .802

Homework from page 104 (mass x abundance) + (mass x abundance) 10.013 amu x .198 1.983 11.009 amu x .802 8.929

Homework from page 104 (mass x abundance) + (mass x abundance) 10.013 amu x .198 1.983 11.009 amu x .802 8.829

Homework from page 104 (mass x abundance) + (mass x abundance) 1.983 + 8.829

Homework from page 104 (mass x abundance) + (mass x abundance) 1.983 + 8.829 10.812 amu

Homework from page 104 (mass x abundance) + (mass x abundance) 1.983 + 8.829 10.812 amu

Homework from page 104 Helium has two naturally occurring isotopes, helium-3 and helium-4. The atomic mass of helium is 4.003 amu. Which isotope is more abundant in nature?

Homework from page 104 Helium has two naturally occurring isotopes, helium-3 and helium-4. The atomic mass of helium is 4.003 amu. Which isotope is more abundant in nature?

Homework from page 104 Calculate the atomic mass of magnesium. Three isotopes are: mass = 23.985 amu, abund. = 78.99% mass = 24.986 amu, abund. = 10.00% mass = 25.982 amu, abund. = 11.01%

Homework from page 104 mass = 23.985 amu, abund. = 78.99% (mass x abundance) mass = 23.985 amu, abund. = 78.99% mass = 24.986 amu, abund. = 10.00% mass = 25.982 amu, abund. = 11.01%

Homework from page 104 23.985 x 78.99% 24.986 x 10.00% 25.982 x 11.01% (mass x abundance) 23.985 x 78.99% 24.986 x 10.00% 25.982 x 11.01%

Homework from page 104 (mass x abundance) 23.985 x .7899 24.986 x .1000 25.982 x .1101

Homework from page 104 23.985 x .7899 = 18.95 amu (mass x abundance) 23.985 x .7899 = 18.95 amu 24.986 x .1000 = 2.498 amu 25.982 x .1101 = 2.861 amu

Homework from page 104 18.95 amu 2.498 amu + 2.861 amu (mass x abundance) 18.95 amu 2.498 amu + 2.861 amu

Homework from page 104 18.95 amu 2.498 amu + 2.861 amu 24.31 amu (mass x abundance) 18.95 amu 2.498 amu + 2.861 amu 24.31 amu

Homework from page 104 18.95 amu 2.498 amu + 2.861 amu 24.31 amu (mass x abundance) 18.95 amu 2.498 amu + 2.861 amu 24.31 amu

Homework from page 104 21. Nitrogen has two naturally occurring isotopes, N-14 and N-15. The atomic mass of nitrogen is 14.007 amu. Which isotope is more abundant in nature?

Homework from page 104 21. Nitrogen has two naturally occurring isotopes, N-14 and N-15. The atomic mass of nitrogen is 14.007 amu. Which isotope is more abundant in nature?

Daily Quiz

iron (Fe) silver (Ag) titanium (Ti) platinum (Pt) uranium (U) Daily Quiz 1. What element has 47 protons? iron (Fe) silver (Ag) titanium (Ti) platinum (Pt) uranium (U)

magnesium (Mg) beryllium (Be) chromium (Cr) phosphorus (P) carbon (C) Daily Quiz 2. What element has 12 electrons? magnesium (Mg) beryllium (Be) chromium (Cr) phosphorus (P) carbon (C)

Daily Quiz 3. How many neutrons are in helium? 1 2 3 4 5

Daily Quiz 4. How many protons are in sodium? 1 3 11 12 23

Daily Quiz 4. How many electrons are in neon? 1 8 10 18 20

Daily Quiz 5. How many neutrons are in carbon? 2 4 6 8 12

iron (Fe) silver (Ag) titanium (Ti) platinum (Pt) uranium (U) Daily Quiz 1. What element has 47 protons? iron (Fe) silver (Ag) titanium (Ti) platinum (Pt) uranium (U)

iron (Fe) silver (Ag) titanium (Ti) platinum (Pt) uranium (U) Daily Quiz 1. What element has 47 protons? iron (Fe) silver (Ag) titanium (Ti) platinum (Pt) uranium (U)

magnesium (Mg) beryllium (Be) chromium (Cr) phosphorus (P) carbon (C) Daily Quiz 2. What element has 12 electrons? magnesium (Mg) beryllium (Be) chromium (Cr) phosphorus (P) carbon (C)

magnesium (Mg) beryllium (Be) chromium (Cr) phosphorus (P) carbon (C) Daily Quiz 2. What element has 12 electrons? magnesium (Mg) beryllium (Be) chromium (Cr) phosphorus (P) carbon (C)

Daily Quiz 3. How many neutrons are in helium? 1 2 3 4 5

Daily Quiz 4. How many protons are in sodium? 1 3 11 12 23

Daily Quiz 4. How many electrons are in neon? 1 8 10 18 20

Daily Quiz 5. How many neutrons are in carbon? 2 4 6 8 12