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2 years ago

What is the mass number of an atom with 3 protons, 4 neutrons, and 3 electrons?

Chemistry

2 answers:

RideAnS [48]2 years ago

6 0

Answer:

Explanation:

NISA [10]2 years ago

5 0

Answer

<h2>If no of proton is 3</h2><h2 /><h2>Then atomic no. Is3</h2><h2 /><h2>Therefore it is Li</h2><h2 /><h2>Mass no. Of li = 7</h2>

Explanation:

<u>HOPE</u><u> IT</u><u> HELPS</u>

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Match the following numbers with the correct number of significant digits they possess. Answers may repeat. (4 points)

mezya [45]

(B. 3) 172 All nonzero digits are significant.

(A. 4) 450.0 x 10^3 Trailing zeroes after the decimal point are significant.

(A. 4) 3427 All nonzero digits are significant.

(B. 3) 0.0000455 Leading zeroes are not significant.

(B. 3) 0.00456 Leading zeroes are not significant.

(C. 5) 2205.2 Zeroes between nonzero digits are significant.

(C. 5) 107.20 Trailing zeroes after the decimal point are significant.

(B. 3) 0.0473 Leading zeroes are not significant.

8 0

3 years ago

ASAP!

Andrei [34K]

Answer:

8.3334%

Explanation:

You have two masses. To find the percent of sodium chloride in water by mass, you divide the mass of NaCl by water. First, make both units the same. Easiest is to convert kg into g. 1.5kg = 1500g

125g NaCl/1500g H2O = 0.0833333333 ==> 8.3334%

5 0

2 years ago

A dry cell produces_______ electricity.<br><br>A) static <br><br>B) current

ivolga24 [154]

Answer:

dude! it's static!

Explanation:

a dry cell can't function and is therefore static!

4 0

3 years ago

Under standard-state conditions, which of the following half-reactions occurs at the cathode during the electrolysis of aqueous

Slav-nsk [51]

Answer:

The following reaction will occur at cathode:

$Ni^{+2}(aq)+2e--->Ni(s)$

Explanation:

The two half reaction during electrolysis of aqueous nickel sulfate will be

a) anode reaction :

Water will undergo oxidation and will evolve oxygen gas at anode as shown in the given reaction:

$2H_{2}O(l) ----> O_{2}(g) + 4H^{+}(aq) + 4e$

b) Cathode reaction: The reduction of Nickel ion will occur by gain of two electrons as shown in the given equation:

$Ni^{+2}(aq)+2e--->Ni(s)$

Thus the overall reaction will be:

$2H_{2}O(l) + 2Ni^{+2}----> O_{2}(g) + 4H^{+}(aq) + 2Ni(s)$

6 0

2 years ago

What type of energy results from the

jeka94

Answer:

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3 0

3 years ago