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
Delicious77 [7]
3 years ago
12

Plz help me thank you so much for helping

Chemistry
2 answers:
malfutka [58]3 years ago
6 0
The answer to it is A
Rina8888 [55]3 years ago
3 0

Answer:

A: matter or mass cannot be created or destroyed

You might be interested in
Which of the following is a physical change?
vodka [1.7K]
Hello,
A physical change describes a change that does physically and does not display “chemical” signs which are signs that indicate a precipitate being formed, change in color, density, or producing gas, etc. “Tearing a piece of paper in half” is a physical change because like I said earlier it doesn’t show any chemical change signs. I hope this helps you out!
6 0
3 years ago
Read 2 more answers
If you have a solution that contains 46.85 g of codeine, C18H21NO3, in 125.5 g of ethanol, C2H5OH, what is the mole fraction of
irakobra [83]

Answer:

0.22

Explanation:

Given, Mass of C_{18}H_{21}NO_3 = 46.85 g

Molar mass of C_{18}H_{21}NO_3 = 299.4 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

Moles= \frac{46.85\ g}{299.4\ g/mol}

Moles\ of\ C_{18}H_{21}NO_3= 0.1565\ mol

Given, Mass of C_{2}H_{5}OH = 125.5 g

Molar mass of C_{2}H_{5}OH = 46.07 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

Moles= \frac{125.5\ g}{46.07\ g/mol}

Moles\ of\ C_{2}H_{5}OH= 0.5535\ mol

So, according to definition of mole fraction:

Mole\ fraction\ of\ codeine=\frac {n_{codeine}}{n_{codeine}+n_{ethanol}}

Mole\ fraction\ of\ codeine=\frac{0.1565}{0.1565+0.5535}=0.22

4 0
3 years ago
(c) Polar solutes were separated by hydrophilic interaction chromatography (HILIC) with a strongly polar bonded phase. How would
Lelu [443]

Answer:

(c) The retention time would be higher (d) The retention time would be lower.

Explanation:

For the polar solutes which were separated using the hydrophilic interaction chromatography (HILIC) with a strongly polar bonded phase, the retention time would be higher if eluent were changed from 80 vol% to 90 vol% acetonitrile in water.

However, for the polar solutes which were separated using the normal-phase chromatography on bare silica with methyl t=butyl ether and 2-propanol solvent, the retention time would be lower if the eluent were changed from 40 vol% to 60 vol% 2-propanol.

5 0
3 years ago
Which property is shared between liquids that are used in thermometers.
miv72 [106K]

Answer:

the property that is shared between liquids us called thermometric property your welcome

8 0
2 years ago
What does Mg stand for in chemistry
makkiz [27]
Mg is an element that stands for Magnesium.

Mg is the chemical symbol for Magnesium. 
3 0
3 years ago
Read 2 more answers
Other questions:
  • Use the dropdown to create a unbalanced diagram with the dog using Applied Force pulling to the right.
    12·1 answer
  • PLEASE HELP
    13·2 answers
  • How many atp molecules are produced during the citric acid cycle?
    15·2 answers
  • Which term names the underground region between where water saturates pores and where it does not? A. water zone B. water table
    12·2 answers
  • A substance whose water solution is a good conductor of electricity is an ________
    11·1 answer
  • Fill in the blank spot.
    11·1 answer
  • Which of the following changes will likely increase the solubility of a solid solute but decrease the solubility of a gaseous so
    13·2 answers
  • The chemistry of life is centered on the chemistry of the element oxygen. True False
    6·2 answers
  • Which chemical equations show a precipitation reaction?
    5·2 answers
  • Describe the properties of oobleck when it behaves like a solid and a liquid.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!