3 years ago

In fossil comparisons, it helps to know about similar:

1 answer:

6 0

Fossils are important evidence for evolution because they show that life on earth was once different from life found on earth today

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sesenic [268]

For the first one.. the Reactant side is Zn+2HCl produces Zncl2 and H2... and it is balanced too

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3 years ago

marshall27 [118]

Answer:

Q3. A bridge is built without expansion gaps.

Explain what could happen to the bridge if the temperature became:

a) much hotter than the day it was built.

b) much colder than the day it was built.

P.s. (this is not a select option question, explain each according to the question)

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3 years ago

alexgriva [62]

Answer:

$V_{base}=24.04mL$

Explanation:

Hello!

In this case, according to the chemical reaction by which HBr reacts with Ba(OH)2:

$2HBr+Ba(OH)_2\rightarrow BaBr_2+2H_2O$

We can see there is a 2:1 mole ratio between the acid and the base; thus, at the equivalent point we can write:

$2M_{base}V_{base}=M_{acid}V_{acid}$

Therefore, for is to compute the volume of the used base, we proceed as shown below:

$V_{base}=\frac{M_{acid}V_{acid}}{2M_{base}}$

And we plug in to obtain:

$V_{base}=\frac{0.319M*50.8mL}{2*0.337M}\\\\V_{base}=24.04mL$

Best regards!

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3 years ago

Alexxx [7]

He answer is 4.9 the graph to the right really means nothing.

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3 years ago

Brut [27]

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3 years ago