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kondor19780726 [428]
3 years ago
5

How many sig figs are in 100.00?

Chemistry
1 answer:
d1i1m1o1n [39]3 years ago
6 0

Answer:

5

Explanation:

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A little aluminum boat (mass of 14.50
Valentin [98]
When the volume is 450 cm3 so the boat will displace 450 g.

so we have  450 g - 14.5g = 435.5 left 

so to get how many pennies can be added to the boat before it sinks can be determined by:

divided the mass for the one penny:

no.of Penny = 435.5 / 2.5g

                     = 174.2 

∴ the boat will float with 174 pennies and will start to sink with 175 

5 0
3 years ago
Calculate the number of kilojoules to warm 125 g of iron from 23.5 °C to 78.0 °C.
insens350 [35]
Given:
Iron, 125 grams T
1 = 23.5 degrees Celsius, T2 = 78 degrees Celsius.  

Required:
Heat produced in kilojoules  

Solution:
The molar mass of iron is 55.8 grams per mole. SO we need to change the given mass of iron into moles.  
 
Number of moles of iron = 125 g/(55.8 g/mol) = 2.24 moles  
<span>
Q (heat) = nRT = nR(T2 = T1)</span>
Q (heat) = 2.24 moles (8.314 Joules per mol degrees Celsius) (78.0 degrees Celsius – 23.5 degrees Celsius)
<u>Q (heat) = 1014.97 Joules or 1.015 kilojoules</u> <span>This is the amount of heat produced in warming 125 g f iron.</span>
7 0
3 years ago
Which of the following pairs are isotpes?
grin007 [14]
The answer is B because isotopes have the same number of protons and neutrons.
5 0
3 years ago
Sodium chloride (NaCl) is made from ___ of sodium (Na) and ___ of chlorine (Cl).
Masja [62]

Answer:

one atom, one atom.

Explanation:

Sodium chloride is made from one sodium atom and one chlorine atom.

Sodium has a charge of +1,  Chlorine has a charge of -1. These cancel each other out leaving only one atom for both sodium and chlorine.

3 0
3 years ago
Read 2 more answers
Hhheppppp fffaaast
umka21 [38]

Answer:

False

Explanation:

Lead sulfate is insoluble in water and sinks in water

(sorry if it's wrong)

4 0
2 years ago
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