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3 years ago

This chart show the amount of radioactivity measured from three unknown isotopes.

Chemistry

1 answer:

Ad libitum [116K]3 years ago

5 0

Answer:

We are asked to describe the half-life of the radioactive materials.

Hence the 3rd option is correct

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What does the epidermis do for the skin?

vampirchik [111]

Addie3137,

The epidermis is the outer layer of the skin. It's function is too "make a skin waterproof it acts as if its a barrier, and it helps give us skin tone." Epidermis also helps us have homeostasis which is how the body keeps cool or warm. Epidermis contains sweat glands which produce sweat once the body reaches it's limit when exposed to heat, and sweating helps keep the body cool.

Hope this helps!

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3 years ago

How many total atoms are there in calcium hydroxide?

AleksAgata [21]

Answer:

5 atoms

Explanation:

1 calcium, 2 oxygen and 2 hydrogen makes for a total of 5 atoms in 1 molecule.

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3 years ago

Read 2 more answers

Write the complete thermochemical equation (including energy) for the combustion of hexane.

antoniya [11.8K]

2C₆H₁₄+19O₂⇒14H₂O+12CO₂+energy
You can tell that the energy is on the left side since the reactoin is highly exothermic meaning it releases heat which can also be thought of as energy.

I hope this helps

5 0

3 years ago

Which subatomic particle has negligible mass and travels around outside the nucleus?

allsm [11]

The electron is a subatomic particle that has a negative charge and a negligible mass. The electron travels around out side the nucleus.

The subatomic particles that are inside the nucleus are protons and neutrons.

The answer to your question is electron.

7 0

4 years ago

Read 2 more answers

A sulfuric acid solution containing 571.6 g of H2SO4 per liter of solution has a density of 1.329 g/cm3. Calculate (a) the mass

IgorLugansk [536]

Answer:

a) 43%

b) 0.122

c) 7.70 molal

d) 5.83 M

Explanation:

Step 1: Data given

Mass of H2SO4 = 571.6 grams

Density of H2SO4 = 1.329 g/cm³ this means 1.329 grams per 1 mL or 1329 grams per 1L

a) Calculate mass percentage

Mass % = (571.6 grams / 1329 grams)* 100% = 43%

b) Calculate mole fraction

Number of moles H2SO4 = Mass H2SO4 / Molar mass H2SO4

Moles H2SO4 = 571.6 grams / 98.08 g/mol

Moles H2SO4 = 5.83 moles

Moles H2O = (1329 -571.6)/18.02 = 42.03 moles

Total moles = 5.83 + 42.03 = 47.86 moles

Mole fraction H2SO4 = Moles of solute (H2SO4)/ Total moles

Mole fraction H2SO4 = 5.83 moles / 47.86 moles

Mol fraction h2SO4 = 0.122

c) Calculate the molality

Mass of solvent = 1329 grams - 571.6 grams = 757.4 grams = 0.7574 kg

Molality of H2SO4 = number of moles H2SO4 / mass of solvent

Molality H2SO4 = 5.83 moles / 0.7574 kg

Molality H2SO4 = 7.70 molal

d) Calculate Molarity

Molarity H2SO4 = Number of moles H2SO4 / volume

Molarity H2SO4 = 5.83 moles / 1L = 5.83 M

6 0

3 years ago