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sineoko [7]
3 years ago
6

Somebody please help me ASAP blank are measured in blank (cm).

Chemistry
1 answer:
Oksi-84 [34.3K]3 years ago
6 0

Answer:

<u>Length </u>are measured in cm.

mark me brainliest

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A sample of calcium carbonate weighs 2.1 kilograms (kg). There are 1,000 grams (g) in 1 kg, and 1 Times. 109 nanograms (ng) in 1
TiliK225 [7]

Answer:

2.1 x 10¹²ng

Explanation:

Mass of the calcium carbonate given is:

                    2.1kg  

We need to take this mass to nanogram, ng.

Since :

               1000g  = 1kg

           10⁹g  = 1ng

So;

          1kg  = 1000 x 10⁹ = 10¹²ng

So;

      2.1kg   will give;

                Since

              1kg  gives 10¹²ng

             2.1kg will give 2.1 x 10¹²ng

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2 years ago
Question 2 of 10
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Why is only one molecule of N2 needed to produce 2 molecules of NH3?
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It's d, here's why.
Stoichiometry: N2 + H2 (for instance) --> NH3
There are 2 Nitrogen atoms (or parts) of Nitrogen on the left side of the equation, and 2 Hydrogen, and only one Nitrogen but three Hydrogen on the other side. Where did the extra Nitrogen go? Where did that Hydrogen come from? The answer is Stoichiometry. 
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To balance Nitrogen, we have to add a 2 to the front of NH3, so we get 2NH3. Nitrogen is balanced, but Hydrogen isn't. There are now 6 Hydrogen being produced by the reaction, so we can add a 3 to the products side, making 3H2.
Now we have N2 + 3H2 --> 2NH3, and everything is balanced.
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Answer:

The bonds between water molecules are easily broken by the strong ions of ionic compounds

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I think the correct answer is B Earth because Earth has 12 tectonics on it and each one is from different areas
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