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
ipn [44]
3 years ago
9

Which is a pure substance helium in a balloon

Chemistry
1 answer:
11Alexandr11 [23.1K]3 years ago
3 0

Answer:

An element is a pure substance as well, because if we fill up a balloon with just helium gas ,it will only contain helium atoms

You might be interested in
Why can’t elements be separated into smaller parts using chemical means?
fenix001 [56]
Why can't elements be separated into smaller parts using chemical means? Too much energy is required, since you'd have to break them down into protons, neutrons, and electrons. You can get this much energy together with nuclear reactions, but not by chemical means.
4 0
3 years ago
The respiratory system is what brings in food and breaks it down True or false
Gala2k [10]

Answer:

false

Explanation:

the respiratory system includes the lungs and heart

not food

5 0
2 years ago
Butane (c4h10) + oxygen -> carbon dioxide + water
ra1l [238]
Please include more description <span />
4 0
3 years ago
What does the 4 indicate in 1s22s22p4? 4th subshell 4 electrons 4th energy level
kupik [55]

Answer: The number 4 indicates 4 electrons.

Explanation: We are given an electronic configuration, which is:

1s^22s^22p^4

Here,

  • The letters denote the sub-shells of an element.
  • The numbers written before the letters which are 1, 2 and 2 represents the Principle Quantum Number and these represents the energy level of the sub-shells.
  • The number which are written in the superscripts which are 2, 2 and 4 denotes the electrons which are present in the sub-shell.

Hence, 4 indicates 4 electrons present in 2p sub-shell.

3 0
3 years ago
Read 2 more answers
A solution containing CaCl2 is mixed with a solution of Li2C2O4 to form a solution that is 3.5 × 10-4 M in calcium ion and 2.33
Burka [1]

Answer:

B. A precipitate will form since Q > Ksp for calcium oxalate

Explanation:

Ksp of CaC₂O₄ is:

CaC₂O₄(s) ⇄ Ca²⁺ + C₂O₄²⁻

Where Ksp is defined as the product of concentrations of Ca²⁺ and C₂O₄²⁻ in equilibrium:

Ksp = [Ca²⁺][C₂O₄²⁻] = 2.27x10⁻⁹

In the solution, the concentration of calcium ion is 3.5x10⁻⁴M and concentration of oxalate ion is 2.33x10⁻⁴M.

Replacing in Ksp formula:

[3.5x10⁻⁴M][2.33x10⁻⁴M] = 8.155x10⁻⁸. This value is reaction quotient, Q.

If Q is higher than Ksp, the ions will produce the precipitate CaC₂O₄ until [Ca²⁺][C₂O₄²⁻] = Ksp.

Thus, right answer is:

<em>B. A precipitate will form since Q > Ksp for calcium oxalate</em>

<em></em>

4 0
3 years ago
Other questions:
  • The study of the structures of deep-sea vents and of the life around them represents an intersection of which two fields of scie
    9·1 answer
  • If a sample containing 2.50 ml of nitroglycerin (density=1.592g/ml) is detonated, how many total moles of gas are produced?
    10·1 answer
  • Write a balanced equation for the formation of one mole of nacl(aq) from its elements
    7·1 answer
  • The legs and the wings of an insect are attached to the ________. a. head b. thorax c. abdomen d. antennae
    13·2 answers
  • The most common shape for a galaxy is ______.
    5·1 answer
  • What is the molarity of a solution that contains 2.38 g of h2c2o4 * 2h2o in exactly 300 ml of solution?
    6·1 answer
  • Inside a volcano how do the slanted layers of hardened lava get there
    8·1 answer
  • Do convalent compounds conduct electricity
    11·1 answer
  • What is the pH of a solution with [H+] of 1x10^-8 M?*<br> 15<br> -8<br> 8<br> 80
    9·1 answer
  • If 5.00 g of pure Na2CO3 is treated with HCL solution, how many grams of NaCl will be produced if the water is subsequently evap
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!