1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Orlov [11]
4 years ago
8

The weather in Europe was unusually warm during the summer of 1995. The TV news reported temperatures as high as 45 degree centi

grate. What was the temperature on the Fahrenheit scale?
Chemistry
1 answer:
Tpy6a [65]4 years ago
5 0

Answer : The temperature on the Fahrenheit scale was, 113^oF

Explanation :

The conversion used for the temperature from degree centigrade to Fahrenheit is:

^oF=(^oC\times \frac{9}{5})+32

where,

^oF = temperature in Fahrenheit

^oC = temperature in centigrade

As we are given the temperature in degree centigrade is, 45

Now we have to determine the temperature in Fahrenheit.

^oF=(45^oC\times \frac{9}{5})+32

^oF=113

Therefore, the temperature on the Fahrenheit scale was, 113^oF

You might be interested in
How can I tell how many neutrons there are in an element
icang [17]
It all depends on if you know the mass number and atomic number then you will be able to find out what the amount of neutron in an element.
7 0
3 years ago
Logs in a fire, and charged batteries are examples of?
vlabodo [156]

Answer:

Logs in a fire is an example of something burning, also changing its state of form. I think thats chemical change; going from wood to ashes. And charged batteries means they haven't been used yet or they were just charged, resulting in physical change.

Explanation:

I just learned this in science.

I hope this helps!

7 0
4 years ago
Explain how the information given below could be used to determine the concentration of an unknown sample.
Vika [28.1K]

Answer:

See below

Explanation:Plot the known concentrations and adsorbance data.  Draw a best fit line through thwe points.  When the absorbance of a solution of unknown concentration (but same substance) is determined, find the concentration from the line at that absorption value.  See attached graph.

E.g., an sample of the same substance had an absorbance of 0.35.  Find that on the x scale and then determine the concentration that would be required to produce that level of absorbance.  0.483M in this case.

8 0
2 years ago
jim jill robert and kim each run paper chromatography on an unknown aqueous mixture. Jim gets a red band jill gets a yellow band
Morgarella [4.7K]
Chromatography is an analytical method of separating components of the mixture. Particularly, this method uses the paper chromatography. The color indicates the type of substance existing. Each substance is designated to one color only. So, if your paper showed more than one color, it mean that there is more than one component in there. Therefore, Kim's specimen contains more than one component because of the red and blue band.
4 0
4 years ago
Starting with 250 mL of a 0.250 M solution of HBr; a) Calculate the initial pH of the solution.b) Calculate the pH after adding
maxonik [38]

Answer:

a.

pH =  0.602

b.

pH = 1.5

c.

pH = 7

d.

pH = 12.1

Explanation:

a ) To calculate the pH, use the following equation:

pH = -log [H+]

Hbr is a strong acid, so the [H+] concentration can be calculated as follow:

[HBr] = 0.250 M

As acid Hbr:

Hbr = H+ + Br-

As strong acid HBr dissociates at all, so

[HBr] = [H+] = 0.250 M

So the pH:

<u>pH = -log [0.250 M] = 0.602</u>

<u></u>

<u>b) Calculate the pH after adding 250 mL of 0.125M NaOH</u>

<u></u>

<u>I</u>n this point, the reactions starts:

<u></u>

HBr + NaOH = H2O + NaBr

- First, we gonna find the mol of each reactant:

HBr:

mol = [M] × L

mol = 0.250 M × 0.250 L

mol = 0.0625 mol HBr

NaOH:

mol = [M] × L

mol = 0.125 M × 0.250L

mol = 0.03125 mol NaOH

In base on the reaction, it’s needed 1 mol of NaOH to neutralize 1 mole of HBr, so to neutralize 0.0625 moles of HBr its needed 0.0625 mol of NaOH:

0.0625 mol HBr – 0.03125 mol HBr = 0.03125 mol HBr

These are the moles free in the solution, and we going to use them to calculate the pH:

pH = -log [ H]

pH = - log [ 0.03125 ] = 1.5

<u>c) Calculate the pH after adding 500 mL of 0.125M NaOH</u>

NaOH:

mol = [M] × L

mol = 0.125 M × 0.500L

mol = 0.0625 mol NaOH

In base on the reaction, it’s needed 1 mol of NaOH to neutralize 1 mole of HBr, so to neutralize 0.0625 moles of HBr its needed 0.0625 mol of NaOH:

0.0625 mol HBr – 0.0625 mol HBr = 0 HBr

pH = 7

<u>d) Calculate the pH after adding 600 mL of 0.125M NaOH.</u>

<u>NaOH:</u>

mol = [M] × L

mol = 0.125 M × 0.600L

mol = 0.075 mol NaOH

In base on the reaction, it’s needed 1 mol of NaOH to neutralize 1 mole of HBr, so to neutralize 0.0625 moles of HBr its needed 0.0625 mol of NaOH:

0.075 mol NaOH – 0.0625 mol NaOH = 00125 NaOH

These are the moles free in the solution, and we going to use them to calculate the pH:

pOH = -log [ OH]

pOH = - log [ 0.0125 ] = 1.90

pH + pOH = 14

pH = 14- pOH = 14 – 1.90 = 12.1

4 0
3 years ago
Other questions:
  • A bird on a long migration flies 63 kilometers per hour for 2900 kilometers. How long does he fly?
    11·1 answer
  • Formic acid (HCO2H) has a dissociation constant of 1.8 _ 104 M. The acid dissociates 1:1. What is the [H+] if 0.1 mole of formic
    5·2 answers
  • กระบวนการหายใจเกิดขึ้นกับเซลล์ทุกเซลล์หรือไม่ อย่างไร
    15·1 answer
  • Which term specifically describes small chunks of rocks and debris in space that travel through the Earth’s atmosphere and hit i
    8·2 answers
  • Which of the following reactions would result in decreased entropy? (multiple choice)
    10·1 answer
  • Provide a method for separating the mixtures of two or three compounds, dissolved in a solvent diethyl ether. In each case one o
    14·1 answer
  • Because electron delocalization stabilizes a compound, if the only way electrons can be moved is away from the most electroneagt
    8·1 answer
  • What Group IA (1) ion has the electronic arrangement shown 1s22s22p6
    15·1 answer
  • A cone-shaped landform develops when magma erupts from the _______ forming a volcano science
    12·1 answer
  • Cups and glasses are taking too long to air dry this could be caused by
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!