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2 years ago

Who is Alfred Wegener? What did he discover?

Chemistry

1 answer:

Aliun [14]2 years ago

3 0

Answer:

Alfred Wegener proposed the theory of continental drift – the idea that Earth's continents move. Despite publishing a large body of compelling fossil and rock evidence for his theory between 1912 and 1929, it was rejected by most other scientists.

Hope this helps!

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Which of the following will result in a chemical change?

Zarrin [17]

The answer would be C. because if you burn coal can you get the same piece of coal back?

5 0

2 years ago

How many grams of zinc metal will react completely with 7.8 liters of 1.6 M HCl? Show all of the work needed to solve this probl

Andru [333]

Answer:

For 1: The correct answer is 407.97 grams.

For 2: The correct answer is 76.72 grams.

Explanation:

For 1:

We are given the molarity of HCl, to find the moles of HCl, we use the formula:

$Molarity=\frac{\text{Moles}{\text{Volume}}$

We are given:

Molarity = 1.6 M

Volume = 7.8 L

Putting values in above equation, we get:

$1.6mol/L=\frac{\text{Moles of HCl}}{7.8L}\\\\\text{Moles of HCl}=12.48mol$

For the given reaction:

$Zn(s)+2HCl(aq.)\rightarrow ZnCl_2(aq.)+H_2(g)$

By Stoichiometry of the reaction:

2 moles of HCl reacts with 1 mole of zinc metal.

So, 12.48 moles of HCl react with = $\frac{1}{2}\times 12.48=6.24mol$ of Zinc metal.

To calculate the mass of zinc metal, we use the formula:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Molar mass of Zinc metal = 65.38 g/mol

$6.24=\frac{\text{Mass of zinc metal}}{65.38g/mol}\\\\\text{Mass of zinc metal}=407.97g$

For 2:

We are given that 298 grams of 83.1 % by mass of iron (II) nitrate solution are present.

So, mass of Iron (II) nitrate solution will be = $\frac{83.1}{100}\times 298=247.638g$

Molar mass Iron (II) nitrate = 180 g/mol

Putting values in equation 1, we get:

$\text{Moles of }Fe(NO_3)_2=\frac{247.638g}{180g/mol}=1.37mol$

For the following reaction:

$2Al(s)+3Fe(NO_3)_2(aq.)\rightarrow 3Fe(s)+2Al(NO_3)_3(aq.)$

By Stoichiometry of the reaction:

3 moles of $Fe(NO_3)_2$ produces 3 moles of iron metal.

So, 1.37 moles of $Fe(NO_3)_2$ will produce = $\frac{3}{3}\times 1.37=1.37mol$ of iron metal.

To calculate the mass of zinc metal, we equation 1:

$1.37=\frac{\text{Mass of iron metal}}{56g/mol}\\\\\text{Mass of iron metal}=76.72g$

5 0

2 years ago

2.00−g sample of a metal X (that is known to form X2+ ions) was added to 0.100 L of 0.500 M H2SO4. After all the metal had react

xz_007 [3.2K]

Answer:

the molar mass is 40 and the metal is Calcium

Explanation:

X + H2SO4=X2SO4 + H2

The mole ratio is 1:1

no of mole of H2SO4= conc(M) × Vol(L)

=0.1×0.5

=0.05 mol

from the balanced chemical equation of the reaction

no of mole of 'X' = no of mole of H2SO4

thus no of mole of X=0.05 mol

Also, no of mole=mass/molar mass

molar mass of 'X'=mol/mass

=2/0.05

=40

3 0

2 years ago

What does pH measure?

Elden [556K]

A. The acidity of a solution

3 0

2 years ago

Read 2 more answers

PLZ HELP

nordsb [41]

Answer:

c fresh water

Explanation:

The ice caps are fresh water because the water can freeze, or become snow and fall down, but it is not cold enough for the salt water to freeze, or to form snow. Therefore there is little to no salt content in ice caps.

4 0

2 years ago

Read 2 more answers