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
Murrr4er [49]
2 years ago
6

HELP ! DUE IN 41 MINUTES! WILL GIVE BRAINLISIT!!!!!!

Chemistry
1 answer:
Dimas [21]2 years ago
3 0

Answer:

they are both chemical changes

Explanation:

You might be interested in
the vapor pressure of a naqueous solution is found to be 24.9 mmgh at 25C. what is the mole fraction of solute in this solution?
Gekata [30.6K]

Answer:

Mole fraction of solute is 0.0462

Explanation:

To solve this we use the colligative property of lowering vapor pressure.

First of all, we search for vapor pressure of pure water at 25°C  = 23.8 Torr

Now, we convert the Torr to mmHg. Ratio is 1:1, so 23.8 Torr is 23.8 mmHg.

Formula for lowering vapor pressure is:

ΔP = P° . Xm

Where ΔP = P' (Vapor pressure of solution) - P° (Vapor pressure of pure solvent)

Xm = mole fraction

24.9 mmHg - 23.8 mmHg = 23mmHg . Xm

Xm = (24.9 mmHg - 23.8 mmHg) /  23mmHg

Xm = 0.0462

8 0
2 years ago
A Metal pan will heat up quickly when placed over a gas or electric burner. The Metal pan is a good what...​
Alik [6]

Answer:

heating up, lol

Explanation:

8 0
2 years ago
What are the base units the SI units are based on?<br> A-10<br> B-100<br> C-1,000<br> D-1
Olegator [25]

Answer:

A-10

Explanation:

In the SI, designations of multiples and subdivision of any unit may be arrived at by combining with the name of the unit the prefixes deka, hecto, and kilo meaning, respectively, 10, 100, and 1000, and deci, centi, and milli, meaning, respectively, one-tenth, one-hundredth, and one-thousandth.

IM NOT SURE PO

4 0
2 years ago
What is a atom and what do atom do in the world ​
gayaneshka [121]

In all atoms, the number of protons and the number of electrons is always the same. The number of neutrons is very roughly the same as the number of protons, but sometimes it's rather more. The number of protons in an atom is called the atomic number and it tells you what type of atom you have.

6 0
2 years ago
Read 2 more answers
How much heat is needed to raise the temperature of water with mass of 27.0 g at 20.0°C to 45.0°C?
ohaa [14]

Answer:

2835 J

Explanation:

Take the specific heat capacity of water as 4.2 J/ g°C.

Energy (heat) = mass x specific heat capacity x change in temperature

(E= mcΔT)

E = 27 x 4.2 x (45-20)

E = 2835 J

7 0
3 years ago
Other questions:
  • The balanced chemical reaction equation in stoichiometry is used to..?
    14·1 answer
  • Which of these are chemical changes in matter? Check all that apply.
    8·2 answers
  • Limestone is used to make cement and mortar. <br> a. True <br> b. False
    15·1 answer
  • Lithium has two stable isotopes with masses of 6.01512 amu and 7.01600 amu. The average molar mass of Li is 6.941 amu. What is t
    10·1 answer
  • Which of the following best describes acid anhydrides?
    15·1 answer
  • PLEASE HELP!!
    15·1 answer
  • What might happen if the greenhouse effect didn't exist?
    6·2 answers
  • I need help with this question ASAP
    8·1 answer
  • Name a mammal that lives in the ocean
    5·2 answers
  • According to the quantum-mechanical model, which element will have similar chemical properties to an element with z = 7?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!