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3 years ago

PLEASE HELP ME ASAP!!! 10 POINTS!!

Chemistry

1 answer:

lapo4ka [179]3 years ago

4 0

Explanation:

A) fission: Iodine-140 (atomic number = 53)

B) fusion: 1 neutron

C) fission: Uranium-233 (atomic number = 92)

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Which is made by weathering???

Alinara [238K]

Minerals, Because when wind blows everything and crushes rocks into minerals.

Please make me brainy answer

7 0

3 years ago

A sample of CaCO3 (molar mass 100. g) was reported as being 30. percent Ca. Assuming no calcium was present in any impurities, c

natka813 [3]

Answer:

Approximately 75%.

Explanation:

Look up the relative atomic mass of Ca on a modern periodic table:

Ca: 40.078.

There are one mole of Ca atoms in each mole of CaCO₃ formula unit.

The mass of one mole of CaCO₃ is the same as the molar mass of this compound: $\rm 100\; g$ .
The mass of one mole of Ca atoms is (numerically) the same as the relative atomic mass of this element: $\rm 40.078\; g$ .

Calculate the mass ratio of Ca in a pure sample of CaCO₃:

$\displaystyle \frac{m(\mathrm{Ca})}{m\left(\mathrm{CaCO_3}\right)} = \frac{40.078}{100} \approx \frac{2}{5}$ .

Let the mass of the sample be 100 g. This sample of CaCO₃ contains 30% Ca by mass. In that 100 grams of this sample, there would be $\rm 30 \% \times 100\; g = 30\; g$ of Ca atoms. Assuming that the impurity does not contain any Ca. In other words, all these Ca atoms belong to CaCO₃. Apply the ratio $\displaystyle \frac{m(\mathrm{Ca})}{m\left(\mathrm{CaCO_3}\right)} \approx \frac{2}{5}$ :

$\begin{aligned} m\left(\mathrm{CaCO_3}\right) &= m(\mathrm{Ca})\left/\frac{m(\mathrm{Ca})}{m\left(\mathrm{CaCO_3}\right)}\right. \cr &\approx 30\; \rm g \left/ \frac{2}{5}\right. \cr &= 75\; \rm g \end{aligned}$ .

In other words, by these assumptions, 100 grams of this sample would contain 75 grams of CaCO₃. The percentage mass of CaCO₃ in this sample would thus be equal to:

$\displaystyle 100\%\times \frac{m\left(\mathrm{CaCO_3}\right)}{m(\text{sample})} = \frac{75}{100} = 75\%$ .

3 0

3 years ago

What is a physical change

Shtirlitz [24]

Answer:

A physical change is a change that does not change the chemical properties of the substance and is purely physical.

Explanation:

The appearance of the object of chemical may change but its chemical properties are the same.

For example:

Ice melting
Water boiling
Dissolving salt in water
Cutting paper

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3 years ago

Which of the following elements is in the same family as fluorine?

Masja [62]

Answer:

c iodine

Explanation:

fluorine is a halogen group element like Bromine, Iodine,Astatine,Chloride

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3 years ago

true or false: for genetic engineering the specific traits of a given organism are located on the DNA sequence of the chromosome

exis [7]

True, moving genes from a chromosome of one organism to a chromosome of a different organism.

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3 years ago