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Otrada [13]
3 years ago
14

While a match burns what type of change occurs?

Chemistry
2 answers:
bogdanovich [222]3 years ago
8 0

C. both a physical and chemical change occur.

Mice21 [21]3 years ago
3 0

ANSWER:

the answer is C.both physical and chemical

~batmans wife dun dun dun...aka ~serenitybella ♡

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How many moles are there in 7.24 grams of calcium carbonate? With work shown
balu736 [363]

Answer:

0.0723371390261859

8 0
2 years ago
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Explain 3 sources of carbon dioxide production and explain how the production of CO2 can lead to global warming.
prisoha [69]

Answer:

Natural sources include decomposition, ocean release and respiration. Human sources come from activities like cement production, deforestation as well as the burning of fossil fuels like coal, oil and natural gas.

Explanation:

3 0
2 years ago
A certain first-order reaction is 27.5 percent complete in 8.90 min at 25°C. What is its rate constant?
jeyben [28]

Answer:

k= 0.145min^{-1}

Explanation:

Hello there!

In this case, according to the given information, it turns out necessary for us remember that the first-order kinetics is given by:

ln(A/A_0)=-kt

Whereas the 27.5% complete means A/Ao=0.275, and thus, we solve for the rate constant as follows:

k=\frac{ln(A/A_0)}{-t}

Then, we plug in the variables to obtain:

k=\frac{ln(0.275)}{-8.90min}\\\\k= 0.145min^{-1}

Regards!

4 0
3 years ago
What fuel source is Jan using if she exercises at 85% of her maximum aerobic capacity?
Marina86 [1]

Answer:

Carbohydrates

Explanation:

Increased exercise intensity means the overall need for energy increases. As we increase exercise intensity we increase our glucose uptake and oxidation which far exceeds uptake, indicating that muscle stores of glycogen are being used. At moderate intensities (65%) there is an increased need for muscle glycogen and muscle triglycerides which is fat. At higher levels of intensities (85%) there is an even greater need for energy, and this is met almost solely by an increased uptake of glucose from the blood and from muscle glycogen.

In the case of fats as an energy fuel source at high intensities, increasing levels of intensity increases fat oxidation but once we get into higher levels of intensity, we return to levels of fat oxidation similar to very low intensities.

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3 years ago
13. During photosynthesis, carbon dioxide and water combine according to the general
yKpoI14uk [10]
C is the answer hope the answer is right
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3 years ago
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