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TiliK225 [7]
3 years ago
5

HEELLP PLEEASEE I GIVE 30 POINTS + BRAINLIEST!!!!!! HELPP PLEEAASEE

Chemistry
1 answer:
Lady bird [3.3K]3 years ago
4 0
You should be able to get the freezing water question. It is very important to know the difference between a chemical and a physical reaction. I'm going to ask that you try this one yourself.

Are you male or female? It won't help for this question. It would have if I'd known before hand. It will help me to answer you later on. Do you cook is the point? If you do, you should know something about what happens when you bake a cake. But you may not be able to guess, even if you do cook. How about dough rising (for bread or buns?) Is that chemical or physical? This time I'll tell you. It's chemical. 
To make a cake you need to blend a whole bunch of things together, sugar flour, eggs (most of the time). What happens? Do the look the same when you've finished baking?

That's right. Something new results especially to the egg. Chemical.

Burning a log is another common example. What are you left with after you've burned a log? Can you get the log back. Is there anything you can do to get the log back? If it was physical, you could. So what's left? And what do you see when you burn a log? Do you live where it snows? If you do, you must have seen a log burn. 
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A sample of gas in a balloon has an initial temperature of 21 ∘C and a volume of 1310 L . If the temperature changes to 70 ∘C ,
bixtya [17]

Answer:

1528.3L

Explanation:

To solve this problem we should know this formula:

V₁ / T₁ = V₂ / T₂

We must convert the values of T° to Absolute T° (T° in K)

21°C + 273 = 294K

70°C + 273 = 343K

Now we can replace the data

1310L / 294K = V₂ / 343K

V₂ = (1310L / 294K) . 343K → 1528.3L

If the pressure keeps on constant, volume is modified directly proportional to absolute temperature. As T° has increased, the volume increased too

7 0
4 years ago
Britta traveled 1250 km on her road trip and used 209 L of gasoline, filling her tank atan average of 1.14 euros per liter. Pier
icang [17]

Answer:

  • Britta paid more per kilometer driven

Explanation:

<u>1) Britta:</u>

  • Distance traveled: 1,250 Km
  • Gasoline used: 209 liter
  • Gasoline price: 1.23 euros / liter

Cost per km = total cost of gasoline / distance traveled

Cost per km = gasoline used × gasoline price / distance traveled

Cost per km = 209 liter × 1.14 (euro / liter) / 1,250 km =  0.19 euro / km

<u>2) Pierce:</u>

  • Distance traveled: 1,405 km
  • Gasoline used: 175 liter
  • Gasoline price = 1.23 euros / liter

Cost per km = 175 liter × 1.23 (euro / liter) / 1,405 km =  0.15 euro / km

<u>3) Comparison:</u>

  • 0.19 > 0.15 ⇒ Britta paid more per kilometer driven
4 0
4 years ago
The line spectrum of lithium has a red line at 670.8 nm. Calculate the energy of a photon with this wavelength.
skad [1K]
3x10^8 / (670.8 * 10^-9) =4.47x10^14 Hz 4.47x10^14 Hz multiplied by plank's constant = 2.9634x10^-19

2.96 x10-19 J
3 0
3 years ago
Read 2 more answers
A sample of a gas is occupying a 1500 ml container at a pressure of 3.4 atm and a temperature of 25 oc. if the temperature is in
Salsk061 [2.6K]

The new pressure will be 7.65 atm

<h3>General gas law</h3>

The problem is solved using the general gas equation:

P1V1/T1 = P2V2/T2

In this case, P1 = 3.4 atm, V1 = 1500 mL, T1 = 25 ^O C, V2 = 2000 mL, and T2 = 75  ^O C

What we are looking for is P2.

Thus, P2 = P1V1T2/T1V2

          = 3.4 x 1500 x 75/25 x 2000 = 382500/50000 = 7.65 atm

More on general gas laws can be found here: brainly.com/question/2542293

#SPJ1

7 0
2 years ago
What characteristic frequencies in the infrared spectrum of your sodium borohydride reduction product will you look for to deter
kkurt [141]

Answer:

A)The characteristic frequency to look out for is  1720-1740 cm-1 (for C=O) for which will disappear in the end product but initially present in the reactant.

B)Characteristic frequency  present in the infrared spectrum will be at a peak of  3300-3400 cm-1 which will be due to O-H stretch.

C)If the product is wet with water there will be no change in the infrared spectrum

Explanation:

The characteristic frequency to look out for is  1720-1740 cm-1 (for C=O) for which will disappear in the end product but initially present in the reactant.

Characteristic frequency  present in the infrared spectrum will be at a peak of 3300-3400 cm-1 which will be due to O-H stretch.

If the product is wet with water there will be no change in the infrared spectrum

5 0
3 years ago
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