CHEMISTRY HIGH SCHOOL

Which of the following pieces of laboratory equipment is not directly used to make measurements?a. test tube
b. graduated cylinder
c. ruler
d. thermometer

Answers

Answer 1
Answer: Test are not directly used to make measurements, I mean you could use them to put 4 mL of a substance in, but not to measure out 4 mL, like with graduated cylinders. Rulers can be used to measure the length of something, like the number of inches. And a thermometer will help you measure the temperature of something.
Answer 2
Answer:

Answer:

A. test tube

Explanation:

edg 2022

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Catalysts affect the chemical reactions that take place within the body. What function do catalysts perform in chemical reactions?a. Catalysts slow down the rate of chemical reactions.
b. Catalysts are always formed by chemical reactions.
c. Catalysts are used up during a chemical reaction.
d. Catalysts lower the activation energy of a chemical reaction

Answers

I think the best answer for this is D.  Catalysts lower the activation energy of a chemical reaction. Catalyst is a substance that speeds a chemical reaction. It is not consumed as the reaction proceeds. A catalyst offers a new route for faster reaction.

What is the atomic mass of ozone ????

Answers

ozone is O3 and the atomic mass of oxygen is 16
so 
the atomic mass of ozone= 16*3=48
Atomic mass of oxygen=16
ozone=O3
ie,16*3=48

Which is true about models in science?A-Models are accurate enough for the phenomena they represent.
B-Models only present macroscopic versions of the submicroscopic.
C-Models help explain phenomena but are not good for predicting events.
D-Models are used throughout science although they are not always accurate.

Answers

D-Models are used throughout science although they are not always accurate.
I think c is the answer but I could be wrong..

how many moles of oxygen gas (o2) are required to react with 3.75 moles of ammonia (nh3) in the reaction 4nh3 + 5o2 → 4no + 6h2o?

Answers

4 NH₃ + 5 O2 = 4NO + 6 H₂O

4 moles NH₃ ---------> 5 moles O₂
3.75 mols NH₃ -------> ?

Moles O₂ = 3.75 x 5 / 4

Moles O₂ = 18.75 / 4

= 4.6875 moles of O₂

hope this helps!

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

Which type of reaction produces the most dangerous radioactive waste?

Answers

The correct answer to the question above is fussion of uranium. The fussion of uranium is the only type of reaction in which produces the most dangerous radioactive waste. The fusion of uranium means the binding of their atoms and produce a radioactive waste.
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