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hichkok12 [17]
3 years ago
9

Which examples represent chemical changes? Check all that apply.

Chemistry
2 answers:
VARVARA [1.3K]3 years ago
5 0

Answer: Burning wood, souring milk, browning of a cut apple

ELEN [110]3 years ago
3 0

Answer:

burning wood, souring milk, and browning of a cut apple

Explanation:

I just answered the question and got it right

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Propane (c3h8) is burned in oxygen to produce carbon dioxide and water. the heat of combustion of propane is -2012 kj/mole. how
Olegator [25]
C_{3} H_{8} + 5 O_{2} ---\ \textgreater \  3CO_{2}  +4H_{2}O    (-2012 \frac{kJ}{mol} )


3 mol                10 mol


C_{3}H_{8} is /excess /reactant

because 3 mol propane require 15 mol oxygen (by reaction)

5 mol oxygen ---1 mol propane, so

10 mol oxygen ---2 mol propane

Only 2 mole propane will be burned,

so 

2012 ( kJ/mol)*2 mol =4024 KJ heat will be given off

Correct answer is number 4.



5 0
3 years ago
Which source would be the most reliable to validate a claim?
Mekhanik [1.2K]

Answer:

In general, print publications with authors and listed sources tend to be reliable because they provide sources which readers can verify. Likewise, Web postings with a .gov (posted by the United States government) are both current and reliable.

Explanation:

4 0
3 years ago
2. what is nappening in this diagram:
natka813 [3]

Answer:

I'm sure but send thru this picture for the question so I can help.

7 0
3 years ago
Una mariposa voló 743 cm y aterrizó en una rosa. Después voló otros 567 cm hasta una margarita. ¿Cuántos metros recorrió la mari
erastova [34]
13. 1 metros
Espero que esto the ayude
4 0
3 years ago
Take car traveling with constant speed travels at 150 km in 7200 a. what is the speed of the car?
Andrej [43]
<span>Find the speed of the car in which it travels at 150 km in 7200 seconds.
This is an easy question, you just need to follow the given formula as always.
Since the time and the distance is already given, we are now looking for the speed
=> time = 7200 seconds
=> distance = 150km</span><span>
d = speed x time
S = distance / time
s = 150 km / 7200 seconds
s = 0.021 km / seconds.
Thus, the car travels for about 0.021 km per seconds.

</span>



5 0
3 years ago
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