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Mandarinka [93]
3 years ago
11

This is a science multiple choice question. I am posting this for the third time because the people who answered it posted a lin

k and when I copied and pasted it to see the answer, it didn't work so please answer correctly without A LINK! Please whoever answers this without posting a link to the answer will be marked brainliest.
I appreciate it, thanks.

Chemistry
2 answers:
Aleks04 [339]3 years ago
6 0

Answer: I'd say Seafloor spreading.

Aleks04 [339]3 years ago
6 0
I believe the answers would be continental drift, sea floor spreading, and lithosphere.

All of these have something to do with plate tectonics.
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In the early 1960s, radioactive strontium-90 was released during atmospheric testing of nuclear weapons and got into the bones o
Advocard [28]

Answer:

52.54 %

Explanation:

Half life = 29 years

t_{1/2}=\frac {ln\ 2}{k}

Where, k is rate constant

So,  

k=\frac {ln\ 2}{t_{1/2}}

k=\frac {ln\ 2}{29.0}\ {years}^{-1}

The rate constant, k = 0.023902 hour⁻¹

From 1964 to 1991:

Time = 27 years

Using integrated rate law for first order kinetics as:

[A_t]=[A_0]e^{-kt}

Where,  

[A_t] is the concentration at time t

[A_0] is the initial concentration

So,  

\frac {[A_t]}{[A_0]}=e^{-0.023902\times 27}

\frac {[A_t]}{[A_0]}=0.5245

<u>The strontium-90 remains in the bone = 52.54 %</u>

5 0
3 years ago
What should scentist use after completing a scientific investigation
Zinaida [17]

Answer:

An Educated Guess

Explanation:

After the scientist is done with the experiment he should do an educated guess, they use the data from the experiments to make charts and graphs to communicate the results of the experiment.  After the scientists makes the hypothesis, they perform this procedure.

4 0
2 years ago
What is velocity?
Airida [17]
A. how fast something moves in a specific direction
7 0
2 years ago
What is the molality of chloride ions in an aqueous solution of magnesium chloride for which xmgcl2 is 0.01?
AfilCa [17]
MgCl₂ ---> Mg(2+) + 2Cl(-)
0,01-x.............x.............2x

MgCl₂ ---> Mg(2+) + 2Cl(-)
0,01-x.............x.............2x
0...................0,01.......0,02

The molality of chloride ions is 0,02M.
8 0
3 years ago
A vessel contained N2, Ar, He, and Ne. The total pressure in the vessel was 987 torr. The partial pressures of nitrogen, argon,
xz_007 [3.2K]

Answer:

The partial pressure of neon in the vessel was 239 torr.

Explanation:

In all cases involving gas mixtures, the total gas pressure is related to the partial pressures, that is, the pressures of the individual gaseous components of the mixture. Put simply, the partial pressure of a gas is the pressure it exerts on a mixture of gases.

Dalton's law states that the total pressure of a mixture of gases is equal to the sum of the pressures that each gas would exert if it were alone. Then:

PT= P1 + P2 + P3 + P4…+ Pn

where n is the amount of gases present in the mixture.

In this case:

PT=PN₂ + PAr + PHe + PNe

where:

  • PT= 987 torr
  • PN₂= 44 torr
  • PAr= 486 torr
  • PHe= 218 torr
  • PNe= ?

Replacing:

987 torr= 44 torr + 486 torr + 218 torr + PNe

Solving:

987 torr= 748 torr + PNe

PNe= 987 torr - 748 torr

PNe= 239 torr

<u><em>The partial pressure of neon in the vessel was 239 torr.</em></u>

4 0
3 years ago
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