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3 years ago

Choose the FALSE statement.

Chemistry

1 answer:

Mariana [72]3 years ago

5 0

Answer:

C. The half-life of C-14 is about 40,000 years.

Explanation:

The only false statement from the options is that the half-life of C-14 is 40,000yrs.

The half-life of an isotope is the time it takes for half of a radioactive material to decay to half of its original amount. C-14 has an half-life of 5730yrs. This implies that during every 5730yrs, C-14 will reduce to half of its initial amount.

All living organisms contain both stable C-12 and the unstable isotope of C-14
The lower the C-14 compared to the C-12 ratio in an organism, the older it is.

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Una disolución contiene 40% de ácido acético en masa. La densidad de la disolución es de 1.049 g/mL a 20°C. Calcule la masa de á

s344n2d4d5 [400]

Answer:

52.45g

Explanation:

The computation of the mass of pure acetic acid in 125mL of this solution is shown below:

The percentage of mass would be equivalent to the g of solute in each 100g of water

As we know that

density = mass ÷ volume

So,

Volume = mass ÷ density

V = 100g / 1.049 (g / ml)

V = 95.328 mL

Now In every 95,328 ml of C_2H_4O_2 there are 40g of C_2H_4O_2

i.e.

each 125ml of C_2H_4O_2 there are 52.45g

SO,

x = 40g. 125ml ÷ 95.328

x = 52.45g

4 0

3 years ago

Which of the following provides cell support in an animal cell? A. microtubule B. mitochondria C. lysosomes D. vacuole

Viktor [21]

Answer:

Vacuole

Explanation:

Hope this helps:)

4 0

3 years ago

How many lobes does a single sp3 hybrid orbital have?

dangina [55]

Two lobes.

The shape of four sp3 hybrid orbitals is part s and part p-each has two lobes but one lobe is much bigger (which is the lobe used for bonding)

8 0

2 years ago

Many chemical processes involve substances in either the liquid or gaseous state. Which of the following statements is correct?

Mrac [35]

A specific mass of a gas has a fixed volume at room temperature

7 0

2 years ago

Mario performed an experiment to investigate how certain substances dissolve in water. He poured the substances in separate beak

geniusboy [140]

Answer: Solubility

Explanation:

Solubility is the ability or property of a solute which can be a solid, liquid, or gaseous chemical substance to dissolve in a solvent (solid, liquid or gas) and form a solution. The factors that affect how soluble a substance is depends on the solvent ,temperature and pressure.

Here, Mario trying to dissolve certain substances (solutes) in water (the solvent shows he is trying to find out the solubility of the substances which can be insoluble, sparingly soluble or very soluble.

8 0

2 years ago

Read 2 more answers