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
trapecia [35]
3 years ago
8

Which element was first discovered in space before it was discovered on Earth?

Chemistry
2 answers:
crimeas [40]3 years ago
8 0

Answer:

carbon was discovered in space before on earth

wlad13 [49]3 years ago
7 0

Answer:

carbon

Explanation:

You might be interested in
Do acids have ph above 7?
nata0808 [166]
No acids have a ph of less than 7 our rain is around a six. dilated water is a 7 and any thing above a 7 is a base
5 0
3 years ago
Read 2 more answers
Which pair of compounds are structural isomers of each other? pentane and 2-methyl pentane pentane and hexane hexane and 2-methy
mojhsa [17]
Hexane and 2-methylpentane. If you draw the structures out, you can see that both isomers have 6 carbon atoms and 14 hydrogen atoms. Hence they have the same molecular formula but a different structural formula. I suggest drawing the compounds out for these types of questions to visualise it.
6 0
3 years ago
Read 2 more answers
Help me out please this is hard​
Brums [2.3K]
The one you have selected is correct. CO is a compound because it contains more than one element.
8 0
3 years ago
Read 2 more answers
Based on the equation, how many grams of Br2 are required to react completely with 36.2 grams of AlCl3?
s2008m [1.1K]

Answer:

65.08 g.

Explanation:

  • For the reaction, the balanced equation is:

<em>2AlCl₃ + 3Br₂ → 2AlBr₃ + 3Cl₂,</em>

2.0 mole of AlCl₃ reacts with 3.0 mole of Br₂ to produce 2.0 mole of AlBr₃ and 3.0 mole of Cl₂.

  • Firstly, we need to calculate the no. of moles of 36.2 grams of AlCl₃:

<em>n = mass/molar mass</em> = (36.2 g)/(133.34 g/mol) = <em>0.2715 mol.</em>

<u><em>Using cross multiplication:</em></u>

2.0 mole of AlCl₃ reacts with → 3.0 mole of Br₂, from the stichiometry.

0.2715 mol of AlCl₃ reacts with → ??? mole of Br₂.

∴ The no. of moles of Br₂ reacts completely with 0.2715 mol (36.2 g) of AlCl₃  = (0.2715 mol)(3.0 mole)/(2.0 mole) = 0.4072 mol.

<em>∴ The mass of Br₂ reacts completely with 0.2715 mol (36.2 g) of AlCl₃ = no. of moles of Br₂ x molar mass</em> = (0.4072 mol)(159.808 g/mol ) = <em>65.08 g.</em>

4 0
3 years ago
Pb has an atomic number of 82. It has an isotope Pb-207. The mass number is 207.
nikdorinn [45]

Answer:

Number of protons = 82

Explanation:

Given data:

Atomic number of Pb = 82

Mass number of Pb-207 = 207

Number of protons = ?

Solution:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

Atomic number of Pb = number of protons or electrons

82 = number of protons or electrons

Mass number = Number of protons + number of neutron

207 = 82 + number of neutron

Number of neutrons = 207 - 82

Number of neutrons = 125

5 0
3 years ago
Other questions:
  • Explain why gasoline will not dissolve in water.
    12·2 answers
  • A phase change from a solid to a gas is called what
    8·2 answers
  • State changes are caused by a change in ____________________.
    9·2 answers
  • What happens when an atom has more electrons than can fit in one energy
    9·1 answer
  • Explain how manipulation of light waves can cause reflection, refraction, diffusion, and absorption; and describe how different
    11·1 answer
  • What does it mean for a hypothesis to be testable?
    5·2 answers
  • Why is the separation of waste rock before mining so important?​
    7·1 answer
  • HURRY PLEASE
    14·1 answer
  • Two atoms with an electronegativity difference of 0. 4 form a bond that is.
    14·1 answer
  • What is the numerical value of gold silver and platinum?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!