Ask question

Ask question

All categories

3 years ago

8

which of the following would be a testable hypothesis for an experimet that compares the health of salmon raisedin fis farms to

salmon caught in the wild?

1 answer:

Alex73 [517]3 years ago

7 0

Which habitat has salmon with less disease per 100 salmon?

You might be interested in

What is the term for a push or a pull on an object

Katyanochek1 [597]

The term for a push or pull is called Force.

4 0

3 years ago

I have 2 samples of solid chalk (aka calcium carbonate). Sample A has a total mass of 4.12 g and Sample B has a total mass of 19

IRINA_888 [86]

Answer:

A) Sample B has more calcium carbonate molecules

Explanation:

M = Molar mass of calcium carbonate = 100.0869 g/mol

$N_A$ = Avogadro's number = $6.022\times 10^{23}\ \text{mol}^{-1}$

For the 4.12 g sample

Moles of a substance is given by

$n=\dfrac{m}{M}\\\Rightarrow n=\dfrac{4.12}{100.0869}\\\Rightarrow n=0.0411\ \text{mol}$

Number of molecules is given by

$nN_A=0.0411\times 6.022\times 10^{23}=2.48\times 10^{22}\ \text{molecules}$

For the 19.37 g sample

$n=\dfrac{19.37}{100.0869}\\\Rightarrow n=0.193\ \text{mol}$

Number of molecules is given by

$nN_A=0.193\times 6.022\times 10^{23}=1.16\times 10^{23}\ \text{molecules}$

$1.16\times 10^{23}\ \text{molecules}>2.48\times 10^{22}\ \text{molecules}$

So, sample B has more calcium carbonate molecules.

The ratio of the elements of carbon, oxygen, calcium atoms, ions, has to be same in both the samples otherwise the samples cannot be considered as calcium carbonate. Same is applicable for impurities. If there are impurites then the sample cannot be considered as calcium carbonate.

7 0

3 years ago

What is the percent by mass of oxygen in carbon dioxide

san4es73 [151]

C = 12
O2 = 16*2= 32
CO2 = (12)+(16*2) = 44

32/44*100 = 72.73%

6 0

3 years ago

The salts NaCl and CaCl

Irina18 [472]

The answer is 8 :)
All nobel gases have 8 outer electrons.

6 0

3 years ago

What law states that the volume of a gas is proportional to the miles of the gas when pressure and temperature are kept constant

Rufina [12.5K]

ideal gas law. but you are talking about moles of gas not miles

5 0

2 years ago