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san4es73 [151]
4 years ago
13

How should the answer be reported using the correct number of significant figures?

Chemistry
1 answer:
valentina_108 [34]4 years ago
5 0
What are the calculation like answer
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In the reaction H2CO3 (aq) + 2NH3 (aq) = 2NH4^+ (aq) + CO3 2- (aq), how many electrons are transferred?
aalyn [17]

The electrons are transferred when the reaction is redox reaction. It means that there must be reduction and oxidation.

The given equation is

H_{2}CO_{3} (aq)+2NH_{3} (aq)=2NH_{4}^{+}(aq)+CO_{3}^{-2}(aq)

The oxidation number of each element remains the same before and after the reaction.

H = +1

C: +4

O: -2

N: -3

Thus this is simple acid base reaction and not redox

There is transfer of proton from bicarbonate to ammonia

this is not a redox reaction


3 0
3 years ago
ASAP! Choose all that apply. Which of the following chemicals are utilized in modern medicine? NaCl Ba N 2O Si C 14H 10O 4 H 2S
Zinaida [17]

Answer:

14 H i think , but i believe that thats the answer

4 0
3 years ago
Read 2 more answers
How to find the atomic number of an element
irinina [24]
The little number at the top of the element

6 0
3 years ago
What is the frequency of a photon of light (in Hz) that has an energy of 2.50 x 10-18 J?
ohaa [14]

Answer:

The answer is

3.77 \times  {10}^{15}  \:  \:  \: Hz

Explanation:

The frequency of the photon can be found by using the formula

f =  \frac{E}{h}  \\

where

E is the energy

f is the frequency

h is the Planck's constant which is

6.626 × 10-³⁴ Js

From the question

E = 2.50 × 10^-18 J

So we have

f =  \frac{2.50 \times  {10}^{ - 18} }{6.626 \times  {10}^{ - 34} }  \\

We have the final answer as

3.77 \times  {10}^{15}  \:  \:  \: Hz

Hope this helps you

5 0
3 years ago
A car, a train, a bicycle, and a skateboard are traveling at the same speed. Which object has the greatest kinetic energy?
Maru [420]

Answer: Train


Since the train is the largest, it has more momentum. Adding the momentum to the speed, gives it the most kinetic energy. After train would come car, then bicycle, then skateboard.


Hope I helped! :)

3 0
3 years ago
Read 2 more answers
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