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2 years ago

What element is similar to Baruim

Chemistry

2 answers:

Levart [38]2 years ago

8 0

Radium
give me brain giv mea brain give me brain fobe me brain give me brain

aivan3 [116]2 years ago

3 0

Answer:

calcium ca

Explanation:

We can see here that the only element that is on the same group (column) as Ba (Barium) is Calcium (Ca).

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What comes last in the scientific method

azamat

Hypothesis

Therefore the last step in the scientific method is proposing a hypothesis or obtaining a conclusion

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3 years ago

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Give one example of an element and one compound. Can someone help me with this pls

Mrac [35]

Element: Helium, Oxygen

Compound: H2O, CO2

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3 years ago

The total mass of the atmosphere is about 5.00 x 1018 kg. How many moles each of air, O2, and CO2 are present in the atmosphere?

n200080 [17]

Answer: The moles of oxygen and carbon dioxide in air is $3.63\times 10^{19}mol$ and $7.18\times 10^{16}mol$ respectively

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of atmosphere = $5.00\times 10^{18}kg=5.00\times 10^{21}g$

Average molar mass of atmosphere = 28.96 g/mol

Putting values in above equation, we get:

$\text{Moles of atmosphere}=\frac{5.00\times 10^{21}g}{28.96g/mol}=1.73\times 10^{20}mol$

We know that:

Percent of oxygen in air = 21 %

Percent of carbon dioxide in air = 0.0415 %

Moles of oxygen in air = $\frac{21}{100}\times 1.73\times 10^{20}=3.63\times 10^{19}mol$

Moles of carbon dioxide in air = $\frac{0.0415}{100}\times 1.73\times 10^{20}=7.18\times 10^{16}mol$

Hence, the moles of oxygen and carbon dioxide in air is $3.63\times 10^{19}mol$ and $7.18\times 10^{16}mol$ respectively

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2 years ago

Can you use volume to measure out a mole of a gas? Why or why not?

Rashid [163]

The volume of a gas is defined by the volume of its container.

However, given the number of moles, and standard temperature and pressure, you can use the Ideal Gas Law to calculate the volume.

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3 years ago

Which of the following compounds contains both ionic and covalent bonds? KOH N2O5 CH3OH Na2O

dusya [7]

Answer: a.KOH

Potassium hydroxide is an ionic compound where the K+ is the cation and OH−is the anion. At the same time, the compound also contains a covalent bond since the anion, OH−is formed from electron sharing between the O and H atoms.

Hope this helps........ Stay safe and have a Merry Christmas! :D

Explanation:

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3 years ago