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
andre [41]
3 years ago
13

1. Which is not an example of matter? (6.P.2.1) * Water Mrs. Saliba Imagination Air

Chemistry
1 answer:
Alchen [17]3 years ago
3 0

Answer:

Imagination

Explanation:

This isnt a real object

Hope this helps

You might be interested in
At a certain temperature the vapor pressure of pure benzene is measured to be . Suppose a solution is prepared by mixing of benz
Marianna [84]

Answer:

P(C₆H₆) = 0.2961 atm

Explanation:

I found an exercise pretty similar to this, so i'm gonna use the data of this exercise to show you how to do it, and then, replace your data in the procedure so you can have an accurate result:

<em>"At a certain temperature the vapor pressure of pure benzene (C6H6) is measured to be 0.63 atm. Suppose a solution is prepared by mixing 79.2 g of benzene and 115. g of heptane (C7H16) Calculate the partial pressure of benzene vapor above this solution. Round your answer to 2 significant digits. Note for advanced students: you may assume the solution is ideal".</em>

<em />

Now, according to the data, we want partial pressure of benzene, so we need to use Raoul's law which is:

P = Xₐ * P°    (1)

Where:

P: Partial pressure

Xₐ: molar fraction

P°: Vapour pressure

We only have the vapour pressure of benzene in the mixture. We need to determine the molar fraction first. To do this, we need the moles of each compound in the mixture.

To get the moles:   n = m / MM

To get the molar mass of benzene (C₆H₆) and heptane (C₇H₁₆), we need the atomic weights of Carbon and hydrogen, which are 12 g/mol and 1 g/mol:

MM(C₆H₆) = (12*6) + (6*1) = 78 g/mol

MM(C₇H₁₆) = (7*12) + (16*1) = 100 g/mol

Let's determine the moles of each compound:

moles (C₆H₆) = 79.2 / 78 = 1.02 moles

moles (C₇H₁₆) = 115 / 100 = 1.15 moles

moles in solution = 1.02 + 1.15 = 2.17 moles

To get the molar fractions, we use the following expression:

Xₐ = moles(C₆H₆) / moles in solution

Xₐ = 1.02 / 2.17 = 0.47

Finally, the partial pressure is:

P(C₆H₆) = 0.47 * 0.63

<h2>P(C₆H₆) = 0.2961 atm</h2>

Hope this helps

7 0
3 years ago
Why are hydrogen bonds so essential to the structure of dna?
Lelu [443]
Hydrogen bonds<span> hold the paired nitrogenous bases together. Because </span>hydrogen bonds<span> are weak </span>bonds<span>, the two strands of </span>DNA<span> are easily separated a characteristic that is important to </span>DNA's<span> function.</span>Hydrogen bonds<span> form between adenine and thymine and between cytosine and guanine.</span>
4 0
3 years ago
I'd: 9872093250, password: qqqqq, join the meeting​
Sonja [21]
You keep on saying join fast wdym?!
4 0
3 years ago
6
Xelga [282]

Answer:

Used to make animal Feed

Explanation:

3 0
3 years ago
If a mineral has a metallic shine and scratches, which of its properties are being measured? Choose the two correct answers.
zzz [600]
If a mineral has a metallic shine and scratches, which of its properties are being measured?
Choose the two correct answers.

magnetism

hardness

cleavage

luster

Answer: hardness and luster
8 0
3 years ago
Other questions:
  • Which element would have the largest radius; Br or Se? Explain
    12·1 answer
  • For the closed system below: Cu(s) + 2Ag+(aq) 2Ag(s) + Cu2+(aq) How would you know if the system is at equilibrium?
    9·1 answer
  • During a spontaneous chemical reaction, it is found that ΔSsys is less than 0. This means that Group of answer choices ΔSsurr is
    12·1 answer
  • There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. In
    11·1 answer
  • I need the answer step by step please
    11·1 answer
  • How do protons, neutrons, and electrons differ in charge?
    15·1 answer
  • What is the percentage of iodine in zinc iodate zn(io3)2
    11·1 answer
  • Describe the scale used to measure the basicity of a substance. Demonstrate how you could differentiate a weak base from a stron
    14·1 answer
  • A chemical change occurs when two or more substances join to form new substances with new ______________ properties
    5·2 answers
  • Serotonin acts as a weak base and has a pkb = 3. 84. what is the ph of a solution made by adding 0. 025 m of serotonin in water?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!