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stealth61 [152]
3 years ago
7

PLEASE ANSWER WITH EXPLANATION

Chemistry
2 answers:
kupik [55]3 years ago
3 0

Answer:B

Explanation: A chemical change is something that is irreversible

Valentin [98]3 years ago
3 0

Answer:

The answer is D

Explanation:

The answer is D because the apple went from being cold to the temperature of the room. No chemicals or anything were done to the apples. They were just set on the counter so this is a physical change. The apples turning room temperature was the cause of the apples turning brown, so the best answer is D.

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Match the term with its description.
Fynjy0 [20]

Answer:

1 a 2c 3d 4b

Explanation:

I think that's right

3 0
3 years ago
Nah I'm gonna fail this quiz help please ​
Eva8 [605]

Answer:

It has 2 eyes

Explanation:

Quantitive observation means that it is facts based of numbers, therefore you can count how many eyes it has, but not that it has red eyes

4 0
3 years ago
How many grams of water (H2O) are there in 2.60 mol of the compound?
ad-work [718]

Answer:

46.839728  grams of water

Explanation:

1 mole is equal to 1 moles H2O, or 18.01528 grams

18.01528 times 2.6 = 46.839728

There are 46.839728  grams h20 in 2.60 mol of the compound

4 0
3 years ago
Carbon-14 has a half-life of 5,730 years. After how many half-lives will 120 grams of Carbon-14 decay to 15 grams?
Sergeu [11.5K]
After 17190 years, Carbon-14 will reach a mass of 15 grams.

Pi is your initial amount (120 grams)
0.5 as your exponential base represents your HALF life hence 0.5
t represents the time elapsed
c represents your given half life value of (5730)
P(t) represents the exponential function of your half life

120/2 =60
60/2 = 30
30 /2 = 15

As you can see above, 3 half lives of 5730 years EACH degraded the carbon-14 to 15 grams. You divide each number by two as it is a HALF life.

P(t)= Pi (0.5) ^t/c
P(17190) = 120 (0.5) ^17190/5730
P(17190) = 120 (0.5) ^3
P(17190) = 15 grams

So your answers should be 3 half lives or after 17190 years have elapsed!
5 0
4 years ago
A rock weighing 30.0g is placed in a graduated cylinder displacing the volume from 22.3 ml to 27.6ml. what is density of the roc
Slav-nsk [51]
Density=mass / volume

Data:
mass=30.0 g
volume=volume with rock - volume without rock=27.6 ml - 22.3 ml=5.3 ml

1 ml=cm³  ⇒ 5.3 ml=5.3 cm³

Therefore:

Density=30.0 g / 5.3 cm³=5.66 g/cm³


Answer: density = 5.66 g/cm³
7 0
3 years ago
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