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
13

What is an element considered a pure substance?

Chemistry
1 answer:
Alona [7]3 years ago
8 0

A compound is a pure substance composed of two or more different atoms chemically bonded to one another. A compound can be destroyed by chemical means. It might be broken down into simpler compounds, into its elements or a combination of the two.


You might be interested in
Which term represents a chemical reaction?
Marizza181 [45]

Answer:

vaporization

Explanation:

7 0
3 years ago
A 20.0 gram sample of an element contains 4.95 x 1023 atoms. what is the element?
Sonja [21]
You will want to find how many grams are in a whole mole so you know which element it is. To do this, find out how much of a mole you have.

4.95 x 10^23 atoms / 6.022 x 10^23 atoms (one whole mole of any element) = .8219860511 or ~82% of 1 mole

Now we know that, find what to multiply 20 g by to get the rest of the mole.

1 mole / .8219860511 mole = 1.216565657

20 g x 1.216565657 = ~24.33 g / mol

Now that you have grams per mole, you can look at the periodic table and the molar masses to see which this number is closely aligned.

Your answer is Magnesium (Mg), which has a molar mass of 24.305 g


7 0
3 years ago
Which stament about energy is mostly correct
klasskru [66]
I would say C is the most correct. 
In D it depends on what water source you're using. Let's say it is a waterfall, then the source of the water (melting ice or a lake) may disappear in the future. 
If you're using underwater "windmills" placed in the ocean, then you would expect it to last a while as the ocean will not disappear in the near future. 
6 0
3 years ago
There are 4.184___<br> in a Joule of energy
Alinara [238K]

Answer: calories?

Explanation: but isn’t it 1 calorie = 4.184 joules of energy

4 0
3 years ago
A solid precipitates from a solution, absorbing heat as it does so. a. Yes b. No c. Can't decide with information given.
inn [45]

Answer:

c. Can't decide with information given.

Explanation:

The chemical and physical processes can be classified as endothermic or exothermic. The first one happens when the system absorbs heat, so the temperature of the surroundings will decrease, and the other one happens when the system releases heat, then the temperature of the surrounds will increase.

Precipitation is the formation of a solid in a solution. The process can happen with absorption or release of heat, it depends on the substance. So, with the information given it's impossible to say it.

3 0
3 years ago
Other questions:
  • What volume and mass of steam at 100. °C and 1.00 atm would release the same amount of energy during condensation as 100. cm^3 o
    15·1 answer
  • In a __________ change the identity of the substance is
    11·1 answer
  • 2. What volume will 3.00 moles of nitrogen gas occupy at STP?
    5·1 answer
  • How many atoms does 6H2O contain
    5·1 answer
  • The percent composition of carbon in C6H12O6 is:
    15·1 answer
  • What characteristic frequencies in the infrared spectrum of your sodium borohydride reduction product will you look for to deter
    6·1 answer
  • If the solution is acidic, which ion is found in greater concentration?
    8·1 answer
  • If a compound contains a poly atomic ion then what type of compound is it A. Convalent Compound B. Ionic Compound
    11·1 answer
  • Divers who go to great depths in the ocean experience large differences in pressure between the surface and their final destinat
    6·1 answer
  • Which option explains how purple pigments make some flower petals purple?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!