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3 years ago

Which questions should you consider when analyzing the credibility of a source? Check all that apply.

Chemistry

2 answers:

zepelin [54]3 years ago

8 0

Answer:

A- who created the source, B- how long will it take to review the source, D - why did the author. create the source. These should be your answers.

Masteriza [31]3 years ago

5 0

Answer:

A: Who created the source?

C: What type of experience does the author have?

D: Why did the author create the source?

Explanation:

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Calcium oxide or quicklime (CaO) is used in steelmaking, cement manufacture, and pollution control. It is prepared by the therma

Elena-2011 [213]

Answer:

The yearly release of $CO_2$ into the atmosphere is $6.73\times 10^{10} kg$ .

Explanation:

$CaCO_3(s)\rightarrow CaO(s) + CO_2(g)$

Annual production of CaO = $8.6\times 10^{10} kg=8.6\times 10^{13} g$

Moles of CaO :

$\frac{8.6\times 10^{13} g}{56 g/mol}=1.53\times 10^{12} moles$

According to reaction, 1 mole of CaO is produced along with 1 mole of carbon-dioxide.

Then along with $1.53\times 10^{12} moles$ of CaO moles of carbon-dioxide moles produced will be:

$\frac{1}{1}\times 1.53\times 10^{12} moles=1.53\times 10^{12} moles$ of carbon-dioxide

Mass of $1.53\times 10^{12}$ moles of carbon-dioxide:

$1.53\times 10^{12}mol\times 44 g/mol=6.73\times 10^{13} g =6.73\times 10^{10} kg$

The yearly release of $CO_2$ into the atmosphere is $6.73\times 10^{10} kg$ .

6 0

3 years ago

The diagram shows a simple model of an event that is part of the rock cycle. image Which type of event is most likely occurring

Bezzdna [24]

Answer: D. the hardening of liquid magma that leads to igneous rock

Explanation:

5 0

2 years ago

What is the concentration of an naoh solution that requires 15.0 ml of a 0.750 m h2so4 solution to neutralize 17.5 ml of naoh?

e-lub [12.9K]

So the first thing we must do is write a balanced equation for the reaction and we know the equation is balnced when all the species on the RHS is equal to the species on the LHS
2NaOH + H₂SO₄ → Na₂SO₄<span> + 2H₂O
</span>
So now it's time to identify what reactant you know the most for from the question (volume & conc. of H₂SO₄) and use that info to find the unknown (conc. of NaOH)

If 1000 ml of H₂SO₄ contain 0.750 mol [0.750 M is the amount of moles in
1 L (1000 ml)]
then let 15 ml of H₂SO₄ contain x mol [15 ml is the amount of the acid that took part in the reaction]

⇒ x = $\frac{15ml * 0.750 mol}{1000 ml}$

= 0.01125 mol

Mole ratio of NaOH to H₂SO₄ can be obtained from the balanced equation
0 2NaOH + 1H₂SO₄ → Na₂SO₄ + 2H₂O

mole ratio of   NaOH to H₂SO₄ is 2 : 1

∴ if mole of of H₂SO₄   = 0.01125 mol
   then moles of NaOH = (0.01125 mol) × 2
= 0.0225 mol

If 17.5 ml of NaOH contain 0.0225 mol    [this was given in the question]
then let 1000 ml of NaOH contain x

⇒ x = $\frac{1000ml * 0.0225 mol}{17.5 ml}$

= 1.286 mol

∴ concentration of NaOH is 1.286 mol/L

8 0

3 years ago

Which chemical element has the shortest name.

Westkost [7]

Tin is the shortest chemical element on the Periodic Table.

8 0

3 years ago

Read 2 more answers

How would the volume of helium in a balloon be affected if the balloon was placed in a room where air temperature is lower?

Alexus [3.1K]

Answer:

The volume will decrease.