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MariettaO [177]
4 years ago
8

How many significant digits are in 6.3590 x 107 mm? 4 5 6

Chemistry
2 answers:
bearhunter [10]4 years ago
4 0
6 significant digits
Verdich [7]4 years ago
3 0
There are 5 significant figures in the following number. All of the numbers essentially are significant.
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A slice of pizza has 500 kcal. If we could burn the pizza and use all the heat to warm a 50-L container of cold water, what woul
gayaneshka [121]

Answer:

10°C  

Explanation:

Heat gain by water = Heat lost by the slice of pizza

Thus,    

m_{water}\times C_{water}\times \Delta T=Q

<u>For water:  </u>

Volume = 50.0 L

Density of water= 1 kg/L  

So, mass of the water:  

Mass\ of\ water=Density \times {Volume\ of\ water}  

Mass\ of\ water=1 kg/L \times {50.0\ L}  

Mass of water  = 50 kg

Specific heat of water = 1 kcal/kg°C  

ΔT = ?

For slice of pizza:  

Q = 500 kcal

So,

50\times 1\times \Delta T=500  

ΔT = 10°C  

Increase in temperature = 10°C  

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3 years ago
The elements potassium (K), Calcium (Ca), and Krypton(Kr) are all part of the same __________ on the periodic table. A) Diagonal
Pavel [41]
The answer is C, I believe.
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Electronegativity _____. generally increases moving from left to right across a period generally decreases moving from left to r
mojhsa [17]
I believe the correct answer would be that electronegativity generally increases moving from left to right across a period. The periodic table of elements is arranged so that trends of the properties of the elements can be shown. For electronegativity, it decreases from right to left which means for the opposite direction it increases.
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Answer: A

Explanation:

6 0
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40 PIONTS!! PLZZZZ HELP
never [62]

Lithium oxide is able to undergo both the processes of dissolution and dissociation.

Dissociation refers to the break down a chemical substance into its constituents. Ionization refers to the loss of electrons from a chemical specie while dissolving refers to the ability of a solid to form a solution.

Let us now look at each of the following species;

  • Lithium oxide undergoes dissolution and dissociation.
  • Magnesium nitride undergoes dissolution and dissociation.
  • Hydrobromic acid  undergoes dissolution and dissociation.

Learn more about ionization: brainly.com/question/1602374

8 0
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