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likoan [24]
3 years ago
8

A rechargeable battery initially stores 3.6 kJ of chemical energy. Anna puts the battery in a flashlight, where 2.1 kJ of energy

are transformed into light and heat. Then, Anna puts the battery in a charger, where 6.8 kJ of electrical energy are transformed into chemical energy. How much chemical energy is now stored in the battery?
Chemistry
1 answer:
Tanzania [10]3 years ago
5 0

8.3 kJ of energy is remaining in the battery.

Explanation:

According to conservation of energy, the tendency of energy is to convert it from one form to another. So if the battery has an energy of 3.6 kJ at first and then it has utilized as 2.1 kJ of energy. So after loosing this energy, it will be 3.6-2.1 = 1.5 kJ of energy.

Again it is stated that the battery is recharged with 6.8 kJ of energy.

Then the modified or the latest energy stored in the battery will be the sum of energy present in the battery after using flashlight with the energy added in the battery by charger.

So, the total energy stored in the battery = 6.8+1.5 = 8.3 kJ

Thus, 8.3 kJ of energy is remaining in the battery.

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What defines a mixture?
erica [24]

B is your best answer because a mixture is when two or more things combine but not chemically. Take soup for example you take out all the pieces because they didn't combine together and just become 1 thing they still have parts. You can still take the noodles, you take the fish or meat out still, you take the broth away to.

6 0
3 years ago
Which statement describes a reason to consider air a mixture? A) The major constituents of air are gaseous elements. B) The comp
umka21 [38]

The correct answer is - A) The major constituents of air are gaseous elements.

With the statement ''the major constituents of air are gaseous elements'' we can easily conclude that the air is a mixture. The reason for that is that we have a plural usage of the word element, elements, which mean that there are multiple elements that make up the air.

The air is indeed predominantly a mixture of gaseous elements. The most abundant gas in the air being the nitrogen with 78.9%, oxygen with 20.95%, argon 0.93%, and carbon dioxide 0.04%, with lesser amounts of other gases also be present in it. The water vapor is also present in the air, though it is variable, being around 1% at sea level, but only 0.4% over the entire atmosphere.

3 0
3 years ago
A pharmaceutical company wants to test the efficiency of its new drug production techniques so they run 3 shifts of production f
spayn [35]

The percentage yield of the  new production technique is 82.8%

<h3>What is the percentage yield?</h3>

Production is the procedure by which finished products are obtained form the raw materials. The production process involves the passing of raw materials through a certain procedure that involves the use of certain machines and equipment to give us the required products.

We are told in the question that there are three shifts;

Shift 1 produces 4562 grams

Shift 2 produces 5783 grams

Shift 3 produces 5247 grams

Average production from the three shifts = 4562 grams + 5783 grams +  5247 grams/3 = 5197 grams

The theoretical average yield is =  7000 grams + 7000 grams + 7000 grams/3 = 7000 grams

Now the percentage yield = actual yield/ theoretical yield * 100/1

percentage yield = 5197 grams/7000 grams * 100/1

percentage yield = 82.8%

Learn more about percentage yield :brainly.com/question/27492865

#SPJ1

3 0
2 years ago
Which of the following statements best describes an animal impacting the hydrologic cycle?
Katena32 [7]

Answer:

When an animal breathes out, water vapor from inside the animal's lungs is released into the air.

Explanation:

The hydrologic cycle is the cycle of water movement throughout the environment. A is the only only one that "recycles" water;

5 0
3 years ago
The two sides of the equation should be
KonstantinChe [14]

Answer:

Hey mate.....

Explanation:

This is ur answer.....

---> Equal

hope it helps,

mark me as the brainliest,

Follow me......

8 0
3 years ago
Read 2 more answers
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