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Allushta [10]
2 years ago
5

An exothermic reaction is a chemical reaction where heat is

Chemistry
2 answers:
ch4aika [34]2 years ago
3 0
Emitted/given off. exo is a way to remember that is is going away. think of a flame. the heat is emitted off onto you.
Aleks04 [339]2 years ago
3 0
Emitted/give enough is the correct answer
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The density of liquid mercury is 13.69 g/cm^3. How many atoms of mercury are in a 15.0 cm^3 sample? Use "E" for "x10" and use si
balu736 [363]
The formula is  m = D x V
D = <span>13.69 g/cm^3.
</span>V = <span>15.0 cm^3 
the mass of the liquid mercury is m= </span>13.69 g/cm^3 x 15.0 cm^3 = 195g
the molar mass of Hg is 200,
1 mole of Hg = 200g Hg, so #mole of Hg= 195 / 200 = 0.97 mol
but we know that
 1 mole  = 6.022 E23 atoms
0.97 mole=?

6.022 E23 atoms x 0.97 / 1 mole = 5.84 E23 atoms
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3 years ago
How does the atmosphere and the hydrosphere affect climate
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How is the hydrosphere changing? Human contributions to greenhouse gases in the atmosphere are warming the earth's surface - a process which is projected to increase evaporation of surface water and accelerate the hydrologic cycle. In turn, a warmer atmosphere can hold more water vapor.
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When bridges are built, special joints must be used because the material of the bridge shrinks, and without these joints, the ma
marysya [2.9K]

Expansion

Explanation:

Expansion is the change is size of a body with increasing temperature and tension.

Bridges are built of iron. Iron thermally expands in the presence of increased temperature during the day. The length of the iron will increase by simple fractions. At night, when temperature drops, the bar returns back to its initial position.

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Learn more:

Expansion in gases brainly.com/question/9979757

#learnwithBrainly

6 0
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Answer question 13. What is the mechanical advantage of a lever that can lift a 100 N load with a input force of 20 N
vazorg [7]
MA= output force/ input force
MA= 100N/20N
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If the sun is next to the earth on the left, and the moon is next to the earth on the right, what type of tide is it?
Andrej [43]

Answer:

When the sun, moon, and Earth are in alignment (at the time of the new or full moon), the solar tide has an additive effect on the lunar tide, creating extra-high high tides, and very low, low tides—both commonly called spring tides.

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