Question 8 of 15The half-life of radium-226 is 1,600 years. It decays into radon-222. What
fraction of the original amount of radium-226 in a sample will still be radium
after 8,000 years?
C.
D.
SUBMIT

Answers

Answer 1

Answer: To find the fraction of the original amount of radium-226 that will still be radium after 8,000 years, we can use the formula for radioactive decay:

Fraction remaining = (1/2)^(t/half-life)

Where:

t is the time in years.
half-life is the half-life of the substance.
In this case, the half-life of radium-226 is 1,600 years, and you want to find the fraction remaining after 8,000 years. Plugging these values into the formula:

Fraction remaining = (1/2)^(8000/1600)

Fraction remaining = (1/2)^5

Fraction remaining = 1/32

So, after 8,000 years, 1/32 of the original amount of radium-226 will still be radium. Therefore, the answer is C.

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Which base is the strongest for the given [H+]? 10-9 10-11 10-10 10-12

Answers

Answer:The strongest base with $H^+]$ concentration is $[H^+]=10^(-12) M$ .

Explanation:

$pH=-\log[H^+]$

Higher the pH value less will be the concentration of $[H^+]$ ion concentration and stronger will be the base.

1. $[H^+]=10^(-9) M$

$pH=-\log[10^(-9)]=9$

2. $[H^+]=10^(-11) M$

$pH=-\log[10^(-11)]=11$

3. $[H^+]=10^(-10) M$

$pH=-\log[10^(-10)]=10$

4. $[H^+]=10^(-12) M$

$pH=-\log[10^(-12)]=12$

The strongest base with $H^+$ concentration is $[H^+]=10^(-12) M$ .

The answer is 10-12. The relationship of pH and [H+] is pH = -lg[H+]. And the higher pH, the stronger base is. So the strongest base has the lowest concentration of H+.

What is the hardest form of carbon

Answers

The hardest form of carbon is diamond.

i believe the answer is diamond. hope this helps!

Which of the following can be used to neutralize an ammonia (NH3) solution?

Answers

It really depends on your options.
Since NH3 solution is a weak base, the option that neutralizes a base is an acid. So find an acid among your options, and here are some examples: HNO3, HCl, etc.

It would have been much better if you had attached some options to choose. But I think I've got what you mean. I bet that solution is HCl.

What is a compound called that has the ability to soak up large amounts of water?

Answers

Answer:

Hygroscopic substances

Explanation:

Hygroscopic compounds are those that absorb moisture and a large amount of water and they become wet. They should not be confused with deliquescent substances that absorb water and forms solution.

Hygroscopic substances froms pasty substances and not solution while the liquid ones only becomes diluted. Examples are sodium trioxonitrate(v) (NaNO₃), copper (ii) oxide CuO, and concentrated tetraoxosulphate (vi) acid (H₂SO₄)

Final answer:

Hydrophilic substances, like cellulose found in cotton and paper pulp, can soak up large amounts of water. Some chemical compounds, such as sodiumcarbonate decahydrate and copper(II) sulfate pentahydrate, have this property. Moreover, phosphorus(V) oxide, although used for removing water from compounds, also shows a great affinity for water.

Explanation:

A compound that has the ability to soak up large amounts of water is termed a hydrophilic substance. Hydrophilic substances are attracted to water, absorbing it readily. For example, cotton and paper pulp, used in towels, are made of molecules of cellulose that contain many –OH groups.

Water molecules are attracted to these -OH groups and form hydrogen bonds with them, drawing large amounts of H₂O up the cellulose fibers. Additionally, some compounds like sodium carbonate decahydrate and copper(II) sulfate pentahydrate also have the ability to soak up water. Another example is phosphorus(V) oxide, which has a great affinity for water and is used for removing water from compounds.

Learn more about Hydrophilic substances here:

brainly.com/question/17283226

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What terms are needed to completely describe velocity... A.units

B.number

C.mass

D.direction

Answers

a, b, and d. mass could be important in your calculations though.

Why CH4 has a lower boiling point than CF4

Answers

Methane,CH4,has a lower boiling point than CF4 because it is a tetrahedral molecule with four equivalent C-H bonds. It's electronic structure is described by four bonding molecular orbitals (MOs) resulting from the overlap of the valence orbitals on C and H. The lowest energy MO is the result of the overlap of the 2s orbital on carbon with the in-phase combination of the 1s orbitals on the four hydrogen atoms.

It is a colorless, natural gas, and can breaks down atom creates CH3 with water vapor that Carbon tetrafluoride,CF4, don't have that has a high bond strength due to its nature of the carbon-fluorine bond and is a potent greenhouse gas.

CH4 has a lower boiling point than CF4 because it is a tetrahedral molecule with four equivalent C-H bonds.

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