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3 years ago

The factor that has the biggest effect on the climate of a region is generally _____.

Chemistry

1 answer:

NemiM [27]3 years ago

3 0

Answer:

Explanation:

Closer to equator means temp high more humidity and more hot

Further form equator cold temp less sun more cold

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The neuron functions to

patriot [66]

Answer:

B) neuron or nerve cell work is to carry messages

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

Carbon and oxygen can only combine to form one compound. Select one aFalse b. True

erastovalidia [21]

Answer:

False

Explanation:

Carbon and Oxygen can for Carbon Monoxide (CO), Carbon Dioxide (CO2), Carbon Trioxide (CO3), etc.

3 0

3 years ago

Question (ii) answer

katrin [286]

The student stirs it because he wants the reaction to take place more quickly.

4 0

3 years ago

Select the correct value for the indicated bond angle in each of the compounds.

Ira Lisetskai [31]

Answer:

Bond angle is defined as the angle between two or more bonds or bonded electron pairs in a compound.

Explanation:

a) O−O−O angle of O3 - <120°

b) F−B−F angle of BF3 - 120°

c) F−O−F angle of OF2 - <109.5

d) Cl−Be−Cl angle of BeCl2 - 180°

e) F−P−F angle of PF3 - 109.5°

f) Cl−Si−Cl angle of SiCl4 - 90°

7 0

3 years ago