The rare earth elements include

Answers

Answer 1

Answer: The rare earth elements include the lanthanide series, scandium and yttrium. They are a set of seventeen chemical elements in the periodic table. They really are not that rare but they occur together in nature and are hard to separate from one another.

Answer 2

Answer:

I tried the lanthanide series and the alkali metals and it was wrong, I think the only other option would be the lanthanide series and the actinide series.

Sorry!!!

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Suppose that geneticists developed a strain of bacteria that breaks down polyethylene, an otherwise non biodegradable plastic. How would such bacteria be useful? Do you foresee any dangers from these new bacteria?

Answers

Polyethylene is a widely used substance for manufacturing plastic. A bacteria like that could "eat" plastic garbage made from polyethelene which would be really helpful. The danger is that a bacteria can't differentiate between junk and useful things made out of PE, so they would eat everything made from it.

Which statement defines the heat capacity of a sample?

Answers

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.

The answer is "the quantity of heat that is required to raise 1 g of the sample by 1°C (Kelvin) at a constant pressure"

Answer:

Explanation:

I just took the test twice and it wasn't D the first time

Can you divide II by another factor and still have it be correct? Why or why not?

Answers

Answer:

no, because factors can not be divided

Explanation:

How far can a cough travel?

Answers

Traveling upwards of 200 mph or 320 km/h, and accelerating in a matter of seconds, germs from a cough or sneeze can travel a great distance very quickly.

The total number of sodium atoms in 46.0 grams of solution is?

Answers

First step, is to find the Molar Mass.
If you go to the periodic table, the Molar Mass of the Sodium Na is 23g/mol

Second Step, you convert from grams to moles.
number of Mole = mass of sodium / molar mass = $(46)/(23) = 2 mol$

Third Step, you find the number of atoms.
As We know, Avogadro said that the number of atoms in 1 mole is about $6.022 * 10^(23)$ .
You use the Rule of three and you find the number of atoms!
1 mole = $6.022 * 10^(23)$ atoms
2 mole = x atomes
x = 2 * ( $6.022 * 10^(23)$ )
x= $12.044 * 10^(23)$ atomes

So, there is $12.044 * 10^(23)$ atoms of Sodium Na in 46g of Solution.

Hope this Helps! :D

molar mass Na = 23g/mol
46g = 456/2 = 2mol
1mol = 6.022*10^23 atoms
2mol = 2*6.022*10623
= 1.204*10^24 atoms

An unstable nucleus loses the most mass if the nucleus emits(1) an alpha particle (3) a positron
(2) a beta particle (4) a gamma ray

Answers

The correct answer is option 1. An unstable nucleus loses the most mass if the nucleus emits an alpha particle. This type of electromagnetic radiation has the largest mass among the radioactive particles. When this particle is emitted from a nucleus, it loses two protons and two neutrons therefore large amount of mass is lost.

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