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Dmitry_Shevchenko [17]

2 years ago

7

What word is used synonymously with the word "base"

1 answer:

Inessa [10]2 years ago

5 0

Answer:

foundation/bottom

Explanation:

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Which event is most likely an example of a chemical reaction

Inessa [10]

Explanation:

One example of a chemical reaction is the rusting of a steel garbage can. That rusting happens because the iron (Fe) in the metal combines with oxygen (O2) in the atmosphere. Chemical bonds are created and destroyed to finally make iron oxide (Fe2O3).

7 0

2 years ago

calculate the mass of 120cc nitrogen present at STP. how many number of molecules are present in it?

Stells [14]

Answer:

$0.15008\ \text{g}$

$3.23\times 10^{21}$

Explanation:

1 mol of nitrogen at STP = 22.4 L = 22400 cc

n = Mol of $N_2$ = $\dfrac{120}{22400}=0.00536\ \text{mol}$

M = Molar mass of $N_2$ = $28\ \text{g/mol}$

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

Mass of $N_2$ is

$m=nM\\\Rightarrow m=0.00536\times 28\\\Rightarrow m=0.15008\ \text{g}$

Mass of the nitrogen is $0.15008\ \text{g}$

Number of molecules is given by

$nN_A=0.00536\times 6.022\times 10^{23}=3.23\times 10^{21}\ \text{molecules}$

The number of molecules present in it are $3.23\times 10^{21}$

5 0

2 years ago

what do you think caused the changes in the finch population and average beak size during the drought

Free_Kalibri [48]

Would it be lack of water and food?

8 0

2 years ago

This is a Science Question:

mr_godi [17]

They are the same as animals ability to find food and get away from others.

8 0

3 years ago

There is a photon with a frequency of 8x10^12 Hz. What is the energy of this<br> photon?

jarptica [38.1K]

Answer:

33.085476 meV ≈ 33 meV

Explanation:

Hope this helped!

7 0

2 years ago