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Tresset [83]
3 years ago
13

How do you know if a reaction is endothermic? 40 points!!!!!

Chemistry
2 answers:
aivan3 [116]3 years ago
6 0
The term endothermic process describes a process or reaction in which the system absorbs energy from its surroundings; usually, but not always, in the form of heat.
stepladder [879]3 years ago
5 0
<span>A reaction is endothermic if, overall, energy is absorbed during the reaction. And it is usually exerted as heat! I hope I helped. And let me know if you need help with anything else. :)</span>
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This means that there are 7 protons in the nucleus of a nitrogen atom. 
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A CaCl2 solution is given to increase blood levels of calcium. If a patient receives 6.1 mL of a 12 % (m/v) CaCl2 solution, how
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Mass of CaCl₂ = 0.732 g

<h3>Further explanation</h3>

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\tt \%(m/v)\rightarrow 12\%=\dfrac{mass~CaCl_2}{volume~of~solution}\times 100\%\\\\mass~CaCl_2=12\%\times 6.1\div 100\%\\\\mass~CaCl_2=0.732~g

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3 years ago
If a car can go from 0 to 60 mi/hr in 8.0 seconds, what would be its final speed after 5.0 seconds if its starting speed were 50
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Answer:

87.5 mi/hr

Explanation:

Because a = Δv / Δt (a = vf - vi/ Δt), we need to find the acceleration first to know the change in velocity so we can determine the final velocity.

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a = vf - vi/ Δt

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= 60 mi/hr / 8 secs

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vi = 50 mi/ hr

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7.5 = vf - 50 mi/hr / 5 secs

37.5 = vf - 50

87.5 mi/ hr = vf

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