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maw [93]
2 years ago
13

How is a pure substance different from a mixture? A.Pure substances are separated by physical means B. Mixtures cannot be separa

ted by physical means C. A pure substance is heterogeneous D. Mixtures are made up of more than one component.
Chemistry
1 answer:
zimovet [89]2 years ago
8 0

Answer:

d

Explanation:

mixtures are made up of more than one components

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2H2 + O2 --&gt; 2 H2O<br> +<br> How many moles of oxygen is required to produce 13.3 moles of water?
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Answer:

Explanation:

Let the number of moles of oxygen = x

2H2 + O2 --> 2 H2O

           x             13.3

Since the balance number for oxygen is 1 and the balance number for water is 2, you must set up a proportion. (Those balance numbers represent the number of moles).

1/x = 2 / 13.3                      Cross Multiply

2*x = 13.3                          Divide both sides by 2

2x/2 = 13.3/2

x = 6.65

You need 6.65 moles of oxygen.

8 0
2 years ago
a block of iron has the dimensions of 3.00 cm x 3.00 cm x 3.00 cm. it has a mass of 213 g. what is its density? a. 638 g/cm3 b.
Juliette [100K]
Volume = 3 cm × 3cm × 3cm
             =  27 cm ³

Mass  =  213 g

Density  =  \frac{MASS}{VOLUME}
 
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</span> 
<span>              =  7.89 g / cm³

Thus answer is D.</span>
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3 years ago
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The reaction between zinc (Zn) and hydrogen chloride (HCl) produces zinc chloride (ZnCl), hydrogen (H2) gas, and heat. If more h
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 If more   heat  is removed from the reaction the rate of reaction change as below to counter the action

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