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dlinn [17]
4 years ago
7

Which of the following is an example of a chemical change?

Chemistry
2 answers:
Alchen [17]4 years ago
6 0
All of the above :)
Nataly_w [17]4 years ago
6 0

Answer:

D because the atoms in sugar is chemically falling apart wich causes the sugar to disolve!

Explanation:

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When the fuel mixture contained in a 1.49 l tank, stored at 750 mmhg and 298 k, undergoes complete combustion, how much heat is
Ket [755]
Get to know first how many moles in the gas:n = pV/RT= (1.013*10^5*750/760) Pa *1.49*10^-3 m^3/(8.314 J/(molK)*298) n = 0.0601 moles. 
The combustion energies  are  889 kJ/mol (methane) and 2 220 kJ (propane) x = moles methane, y = moles propane 
x*889 + y*2220 = 778 x + y = 0.0601----------- x = 0.267784 moles = 0.267784*100/0.0601 = 44.6 % y = 0.243216 moles = 0.243216*100/0.0601 = 55.4 %
4 0
3 years ago
If you have difficulty removing a ring from your finger, you usually lubricate your finger with oil or soap
Deffense [45]

Answer:

Because oil reduces the friction between the surface of your ring and your finger.

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Hope it helps

5 0
3 years ago
A 52-gram sample of water that has an initial temperature of 10.0 °C absorbs 4,130 joules. If the specific heat of water is 4.18
FinnZ [79.3K]

Answer:

The final temperature of the water is 28.98 degree Celsius.

Explanation:

It is given that,

Mass of sample of water, m = 52 grams

Initial temperature, T_i=10^{\circ}C

Heat absorbed, Q=4,130\ J

The specific heat of water is 4.184\ J/(g^{\circ} C)

We need to find the final temperature of the water. The heat absorbed is given by the formula as follows :

Q=mc\Delta T\\\\Q=mc(T_f-T_i)\\\\T_f=\dfrac{Q}{mc}+T_i\\\\T_f=\dfrac{4130}{52\times 4.184 }+10\\\\T_f=28.98^{\circ} C

So, the final temperature of the water is 28.98 degree Celsius.

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3 years ago
How does chemistry affect sports?
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c

Explanation:

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3 years ago
Question 2 of 10
professor190 [17]

Answer:

It's the button with the x, and a blank box above it.

Explanation:

Check the attachments, you'll see what it looks like. It will probably look different on your calculator, but the icon should be the same or similar.

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2 years ago
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