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
soldi70 [24.7K]
3 years ago
7

Which of the answer choices best describes elements?

Chemistry
1 answer:
lianna [129]3 years ago
4 0
It can be a compound or a single element. An element is a pure substance that cannot be separated into simpler substances by chemical or physical means. There are about 117 elements, butcarbon, hydrogen, nitrogen and oxygen are only a few that make up the largest portion of Earth.

I would say d.
You might be interested in
How many bromine atoms are present in 39.0 g of ch2br2?
Mandarinka [93]
Answer is: there is  2,69·10²³ atoms of bromine.
m(CH₂Br₂) = 39,0 g.
n(CH₂Br₂) = m(CH₂Br₂) ÷ M(CH₂Br₂).
n(CH₂Br₂) = 39 g ÷ 173,83 g/mol.
n(CH₂Br₂) = 0,224 mol.
In one molecule of CH₂Br₂, there is two bromine atoms, so:
n(CH₂Br₂) : n(Br) = 1 : 2.
n(Br) = 0,448 mol.
N(Br) = n(Br) · Na.
N(Br) = 0,448 mol · 6,022·10²³ 1/mol.
n(Br) = 2,69·10²³.
7 0
3 years ago
The dark areas on the world map show places with climates that are alike. The table shows information for those places. A
vlabodo [156]

Answer:

Choice B

They are polar climates because they are dry

and cold

6 0
2 years ago
Characteristics of a substance that can be measured or observed by changing the identity of the material is a
algol [13]
C cause ur changing the identity of the material
4 0
2 years ago
Does a displacement reaction take place in 'magnesium + lead nitrate'? and if so why?
cestrela7 [59]

Answer:

Maybe or maybe not (not sure)

Explanation:

A displacement reaction is a type of reaction where one element is displaced by another from a compound.

In the case of magnesium and lead nitrate, magnesium is more reactive than lead. Therefore, it will displace lead from lead nitrate to form magnesium nitrate and lead.

The reaction can be represented as:

Mg(s) + Pb(NO3)2(aq) → Mg(NO3)2(aq) + Pb(s)


Another answer could be;

A displacement reaction does not take place in 'magnesium + lead nitrate' because magnesium is more reactive than lead.

5 0
2 years ago
Which of the following compounds is not possible?
neonofarm [45]

Answer:

C

Explanation:

Large chlorine atoms can not fit within the atoms of boron

4 0
3 years ago
Other questions:
  • Use the periodic table to help you.
    7·2 answers
  • The inner four planets of our solar system are called the __________ planets and the next four are called the __________ planets
    6·1 answer
  • Where else do you see Force & Motion in real-world experiences?
    6·2 answers
  • Consider the following reaction at 298K.
    7·1 answer
  • Which ion would represent the ion of an element from Group 2A?
    12·1 answer
  • Electron configuration of br-1
    6·1 answer
  • How many moles of kclo3 are required to produce 14.3 moles of kcl?
    7·2 answers
  • Answer please :) really needed
    11·2 answers
  • A scientist produces zinc iodide (zni2). (a) calculate the minimum mass of zinc that needs to be added to 0.500 g of iodine so t
    11·1 answer
  • How many atoms are in 76.15 grams of fe<br><br> urgently needed, will mark brainliest
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!