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2 years ago

Please help me get the answer to bothe a and b

Chemistry

1 answer:

neonofarm [45]2 years ago

3 0

Answer:

If a metal and metal solution react, the more reactive metal will displace the less reactive metal from solution. If the metal in solution you start with is formed from a more reactive metal than the metal to be added, no reaction will occur.

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HELP ASAPPPP

Cloud [144]

Answer:

13 years

Explanation:

From;

0.693/t1/2 = 2.303/t log (No/N)

Where;

t1/12 = half-life of Cobalt-60 = 5.3 years

t = time taken = the unknown

No = mass of radioactive material originally present = 5.2 g

N = mass of radioactive material at time t = 0.95 g

Substituting values;

0.693/5.3 = 2.303/t log (5.2/0.95)

0.131 = 2.303/t(0.738)

0.131 = 1.6996/t

t = 1.6996/0.131

t = 12.97 years

t = 13 years(to the nearest whole number)

3 0

3 years ago

‼️SHOW ALL STEPS‼️ If 14.4 grams of iron reacts with hydrochloric acid, how many grams of hydrogen gas will be produced?

Alex Ar [27]

Answer: 0.771 g of $H_2$ will be produced

Explanation:

To calculate the moles :

$\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}$

$\text{Moles of} Fe=\frac{14.4g}{56g/mol}=0.257moles$

The balanced chemical reaction is:

$2Fe(s)+6HCl(aq)\rightarrow 2FeCl_3(aq)+3H_2(g)$

According to stoichiometry :

2 moles of $Fe$ produce = 3 moles of $H_2$

Thus 0.257 moles of $Fe$ will produce= $\frac{3}{2}\times 0.257=0.385moles$ of $H_2$

Mass of $H_2=moles\times {\text {Molar mass}}=0.385moles\times 2g/mol=0.771g$

Thus 0.771 g of $H_2$ will be produced

3 0

3 years ago

What are some ways that scientists use to model chemical reactions?

seropon [69]

Answer:

they identify factors that affect chemical processes then they determine the amount of substance produced or consumed then predict the amount of energy released or absorbed

6 0

3 years ago

Rewrite this measurement with a simpler unit, if possible. <br> 8.3 kg•m^2/ s^2

Feliz [49]

Answer: 8.3 J

Explanation:

We have the following measurement:

$8.3 \frac{kg m^{2}}{s^{2}}$