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DiKsa [7]
3 years ago
11

Which graph represents an exothermic reaction?

Chemistry
1 answer:
OLga [1]3 years ago
4 0

Answer:

A

Explanation:

got it right on edge2020

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Radon-222 is a radioactive gas with a half-life of 3.82 days. How long would it take for fifteen-sixteenths of a sample of radon
Fittoniya [83]
Use the formula in terms of half life from the normal exponential functions 
<span>
N(t) = N(0) (1/2) ^ (t/thalf) </span>
<span>
N(0) is the original quantity </span>
<span>
N(t) = quantity remaining at time t </span>
<span>
t is the time </span>
<span>

thalf is half life </span>
<span>
1/16 = (1/2)^(t/3.82) </span>
<span>
16 = 2^(t/3.82) </span>
<span>
4 = t/3.82 </span>
<span>
t = 15.28 days

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
</span>
8 0
3 years ago
Calculate the heat change in calories for melting 65 g of ice at 0 ∘c.
Genrish500 [490]

When ice melts, the physicals state changes from solid to liquid. The energy or the heat required (q) required to change a unit mass (m) of a substance from solid to liquid is known as the enthalpy or heat of fusion (ΔHf). The variables; q, m and ΔHf are related as:

q = m * ΔHf

the mass of ice m = 65 g

the heat of fusion of water at 0C = ΔHf = 334 J/g

Therefore: q = 65 g * 334 J/g = 21710 J

Now:

4.184 J = 1 cal

which implies that: 21710 J = 1 cal * 21710 J/4.184 J = 5188.8 cal

Hence the heat required is 5188.8 cal or 5.2 Kcal (approx)

5 0
3 years ago
True or False ? Endothermic reactions are characterized by net absorption of thermal energy from its surroundings which leads to
Artemon [7]
False

 Signed by Virtuoso
3 0
3 years ago
Which best explains why water is able to “stick” to the side of glass?
AveGali [126]

Explanation:

Adhesion means the ability to stick on the surface of another substance.

Water exhibits adhesive forces due to which it is able to stick to the glass.  Due to adhesive forces water spreads over the surface of glass and sticks to it.

These adhesive forces between the glass and water enough that it deforms the spherical shape of water molecules and help them stick to the surface of glass. As a result, adhesive forces overcome the repulsion between like molecules.

Hence, water is able to “stick” to the side of glass due to strong adhesive forces.


4 0
3 years ago
Read 2 more answers
Ten pints of 15 % salt solution are mixed with 15 pints of 10 % salt solution. What is the
sergij07 [2.7K]
Concentration\ rate=\frac{mass\ of\ product}{mass\ of\ substance}*100\%\\\\&#10;15\%=\frac{m_1}{ms_1}*100\%\\ms_1=10pints\\&#10;15\%=\frac{m_1}{10}*100\%\\&#10;\frac{15}{100}=\frac{m_1}{10}\ \ |*10\\&#10;m_1=\frac{150}{100}=1,5pints\\\\&#10;10\%=\frac{m_2}{15}*100\%\\&#10;0,1=\frac{m_2}{15}\ \ |*15\\&#10;1,5=m_2\\&#10;Resulting\ solution:\\&#10;ms=ms_1+ms_2=15+10=25pints\\m=m_1+m_2=1,5+1,5=3pints&#10;\\\frac{m}{ms}*100\%=\frac{3}{25}*100\%=12\%
7 0
2 years ago
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