Answer:
The questions are incomplete
Explanation:
(b) This question is incomplete. However to calculate the number of moles of CuSO₄ present in the impure sample. The formula below can be used;
number of moles = mass of CuSO₄ present in the impure sample ÷ molar mass of CuSO₄
(c) This question is also incomplete. However, to calculate the mass percentage of CuSO₄ present in the impure sample of CuSO₄, the formula below can be used.
Mass percentage of CuSO₄ =
mass of CuSO₄ present in the impure sample/mass of impure CuSO₄ × 100
Thus, the mass of the impure sample must be measured also since the actual mass of the CuSO₄ present in the impure sample must have been measured before calculating the number of moles.
what happens during chemical reactions?
Answer:
Energy is given off or absorbed.
Explanation:
A P E X
How do the electromagnetic spectrum and visible light connect?
Explanation:
The visible light is a part of the electromagnetic spectrum with the range of 400nm to 700nm.
Visible light is made up of all the colors we can perceive.
The electromagnetic spectrum is a series of radiation. The most energetic have the highest frequency and lowest wavelength. The visible light is part of the spectrum. It is the part of the spectrum that allows for sight.H2O oxidation number
Answer:
2 ^0
Explanation:
Answer:
0
Explanation:
Water doesn't really have a charge
How many mL of ethanol would you
add to water to make 1750 mL of a
40.0% ethanol solution (v/v%)?
Answer:
700 mL of ethanol would be added
Explanation:
Given data:
Volume of ethanol added to make 40% v/v solution = ?
Total volume of solution = 1750 mL
Solution:
We will calculate the 40% 1750 mL which will be the volume of ethanol added to the water to make 40%v/v solution.
(40/100)× 1750 mL
0.4 × 1750 mL
700 mL
700 mL of ethanol would be added.
Before the quarry was dug, the land contained more vegetation. What impact has this change most likely
had on the local ecosystem?
Answer: loss of nutrients
Explanation:
the quarry was dug up and vegetation started dyeing. the quarry was probably rich with nutrients.
Jose times how long sugar takes to dissolve in warm water. He conducts four trials of his experiment. What should he conclude from his data?
Trial Time
1 30 seconds
2 32 seconds
3 10 seconds
4 29 seconds
Sugar does not dissolve in water.
The time recorded for Trial 3 may be inaccurate.
His experiment has very low precision.
Answer:
His experiment has very low precision
Explanation:
Precision is how close the answers are together. The answers are increasing in time. So, this makes sence. None of the answers are similar to one another.
what is deposition ?
The act of depositing material, especially by a natural process; the resultant deposit.
Answer:
the act of deposing someone especially a monarch
Balance the following chemical equation
Which of the following are subatomic particles that orbit the outside of an atom?
A.
molecules
B.
electrons
C.
neutrons
D.
protons
I added 6 to a certain number and then divide the result by 3. Find the number if my final answer is 5. (show working)
Answer:
let the number be x
so (x+6)/3 =5
x+6=15
x=9
Which of the following is NOT a chemical change?
Answer:
?
Explanation:
Rock salt mixed with ice actually lowers the temperature of the salt/ice mix. Physical or chemical property?
Answer:
chemical
Explanation:
Salt changes the chemical makeup of the water and allows it to get colder than what it would normally freeze at.
If 45.0 mL of a 4.00 M sodium sulfate (Na2SO4) solution is used for the reaction shown above, how many moles of sodium ions were present in solution before the reaction proceeded?
Answer:0.360
Explanation:
I had this on ck12 yesterday
The moles of sodium ions were present in the solution before the reaction proceeded is 0.36moles
Molarity of a solutionThe formula for calculating the molarity of a solution is expressed as:
Molarity = moles/volume
Given the following parameters
Molarity = 4.00M
Volume of sodium sulfate = 45mL = 0.045L
Substitute to have;
Molarity = 4 * 0,045
Molarity = 0.18
Since there are 2 atoms of sodium ion in the solution, hence the moles of sodium ions were present in the solution before the reaction proceeded is 0.36moles
Learn more on molarity here: https://brainly.com/question/17138838
Place following elements in order from largest to smallest atomic radius. S, P, Na, Rb, Cl
Answer:
Rb>Na>P>S>Cl
Explanation:
In a group from up to down the atomic radius increases
In a row from left to right the atomic radius decreases.
Drinking water should have sufficiently low levels of____
to prevent disease. The missing word ?? Please
Answer:
Drinking water should have sufficiently low levels of dissolved salts or microbes.
Explanation:
In your own words, explain why each of the filler blocks (s,p,d,f) on the periodic chart have their characteristic width(number) of groups.
Answer:
Each of the four blocks of the periodic table is the collection of elements that have common valence orbitals, or that their valence are found in one of the four orbitals with azimuthal quantum number 0, 1, 2, or 3 which corresponds to the shape (s), principal (p), diffuse (d), or fundamental (f) orbitals respectively
The maximum number of electrons in the s-orbital = 2 electrons
The maximum number of electrons in the p-orbital = 6 electrons
The maximum number of electrons in the d-block = 10 electrons
The maximum number of electrons in the f-orbital = 14 electrons
Therefore, given that the elements of the within each of the blocks have their valence electron in the corresponding orbital in which they are located on the periodic table, given the periodic nature of the periodic table, the width of each block of elements corresponds to the maximum number of elements that can be found in their valence orbital.
Therefore, we have;
The width of the s-block elements = 2 block units
The width of the p-block elements = 6 block units
The width of the d-block elements = 10 block units
The width of the f-block elements = 14 block units
Explanation:
I need help please???
Answer:
the answer is the 2nd option
Explanation:
distance is divided by rime
What kind of reaction is KI(aq) +AgNO3(aq) --> AgI(s) + KNO3 (aq)
Answer:
A double-replacement reaction
Explanation:
you're welcome
A steel cylinder with a moving piston on top is filled with helium (He) gas. The force that the piston exerts on the gas is constant, but the volume inside the cylinder doubles, pushing the piston up.
Which is the cause for the change?
A. The helium atoms increased in size.
B. The density of the helium atoms decreased.
C. The temperature increased.
D. The pressure decreased.
Answer: B. The density of the helium atoms decreased.
Explanation:
well its an easy one but it hard for me so plz
Answer:
need more so we can answer
Explanation:
put them in order the right way like the question says. get correct for brainleist! :)
Answer:
Fall or autumn
Explanation:
Where would we find yellow bone marrow?
Answer:
Yellow bone marrow can be found in the long bones of the human body one such bone being the femur the yellow bone marrow contains certain stem cells which produce cartilage, fat and bone.
Explanation:
Answer:
Yellow bone marrow can be found within the medullary cavity. You see, the anatomy of a compact bone consists of blood vessels, cartilage, red bone marrow, etc. Within the bone there is spongy bone which holds the medullary cavity, and within this cavity there is yellow bone marrow.
Who is best associated with Psychoanalysis?
-Wilhelm Wundt
-Sigmund Freud
-William James
-None of the above
-Other:
Answer:
None of the above
Explanation:
Erikson's was a student of freud's and expanded of his theory of psychosexual development by emphasizing the importance of culture in parenting practices and motivations and adding three stages of adult development.
Which type of substance have a definite shape and fixed volume?
Solids only
Liquids and solids
Gases only
Liquids and Gases
On a hot day, the wood gate on the side of my house gets stuck and I have to push very hard to get it open and shut. Describe *on the molecular level* why this is happening. Use these terms in your answer: kinetic energy, molecules
Answer:
Well rust just because the rain and wind sun whatever its meatal it stayed outside too long!
Explanation:
I really dont kno but i hope im right
Plz I need help!!!!!!!!!!!
Answer:
Your help from me is a good luck! :)
Explanation:
Lol sorry I don't know the answer and don't want to tell you something wrong. Good luck though. Have a great day!
Quinton answer me or I will never talk to u again pls
Answer:
huh
Explanation:
giveaway!! 2 more coming up.
hope you get it ! <3
Answer:
k
Explanation:
Thank you for hosting <3
Show your calculation by uploading a picture. Calculate the molar mass of ammonia, NH3
Answer:
17.04 g/mol
Explanation:
Molar Mass of NH₃
we know that
Nitrogen has 14.01 gram/mol
And Hydrogen has 1.01 gram/mol
but we have 3 Hydrogens So we multiply
1.01 by 3 i.e., 3.03
Now, add
14.01
+ 3.03
17.04
So, The molar mass of ammonia, NH₃ is
17.04 g/mol
-TheUnknownScientist
If the temperature changes in a chemical reaction, what has occurred?
Energy was transferred.
There was no energy transfer.
Energy was destroyed.
Energy was created.
Answer:
Energy was transferred
Explanation:
If the temperature changed, energy must have been added or lost, but not created. Energy can't be created or destroyed.
