Answer:
E = hf
E = hc/lamda
where E-energy,
h-planck's constant (6.62 x 10^-34 Js)
f- frequency ( f = c/lamda)
c-velocity of light ( 3 x 10^8 m/s)
lamda- wavelength
you can this formula to solve all the 4 questions.
please help!!!
A chemist dilutes 2.0 L of a 1.5 M solution with water until the final volume is 6.0 L. What is the new molarity of the solution?
show work.
The new molarity of the solution is 0.5M.
HOW TO CALCULATE MOLARITY?The molarity of a solution can be calculated by using the following expression:
C1V1 = C2V2
Where;
C1 = initial molarityC2 = final molarityV1 = in initial volumeV2 = final volumeAccording to this question, a chemist dilutes 2.0 L of a 1.5 M solution with water until the final volume is 6.0 L.
1.5 × 2 = 6 × C2
3 = 6C2
C2 = 3/6 = 0.5M
Therefore, the new molarity of the solution is 0.5M.
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What is the density of a liquid that has a mass of 26g and a volume of 4 mL?
6.5 g/cm³
Explanation:Hi there !
density formula
d = m/V
1ml = 1cm³
= 26g/4cm³
= 6.5 g/cm³
Good luck !
Using the formula M1V1 = M2V2 , how many milliliters of a 2. 50 M hydrochloric acid solution is required to make 100. 0 mL of a 0. 750 M solution?.
Dilution of the solution can be calculated by the formula of the molarity and volume. The initial volume of 2.50 M solution was 30 mL.
What is the relationship between molar concentration and dilution?Molar concentration or the dilution factor is in an inverse relationship and with an increase in the dilution, the molarity of the solution decreases.
Given,
Initial molarity = 2.50 M
initial volume = ?
Final molarity = 0.750 M
Final volume = 100.0 ml
Substituting values in the formula:
[tex]\begin{aligned}\rm V_{1} &= \rm \dfrac{M_{2}V_{2}}{M_{1}}\\\\&= \dfrac{0.750 \times 100}{2.50}\\\\&= 30 \;\rm mL\end{aligned}[/tex]
Therefore, 30 mL was the initial volume of the solution before it was diluted.
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One of the advantages of nylon over rayon is that nylon:
Identify: Now it is time to identify the mineral. Look at your Mineral Key. Find a mineral that has properties that match Sample A. Type the name under Mineral name in the Gizmo and press Submit. It may take several guesses to get it right.
What mineral is Sample A?
(NEED ANSWER ASAP)
Answer:
The answer is quartz!
Explanation:
It has a density of 2.6 g/mL, its color is Silver (variable), and its luster is glassy. It has a hardness of 7 and has a colorless streak.
Why is the right side
of the periodic table
negative (gaining
electrons) and the
left side positive
(loosing electrons)?
Answer:
The elements on the left-side of the periodic table are relatively electron deficient. So due to their comparatively low effective nuclear charges (the net positive charge of the protons minus the shielding core electrons below the valence level), their electrostatic hold on these electrons are weak.
Elements further right on the period table though, have higher effective nuclear charges and stabilize electrons more effectively. Which leads to localized covalent bonding and the formation of molecules.
The right side contains non metals while the left side contains metals.
Metals lose electrons (negative electrons). They now have more protons, therefore making the ion positive.
Non metals gain electrons (positive electrons). So the ion has more electrons than protons which makes the ion negative.
Which is the function of space observatory technology?
classify objects in space
collect soil and rock samples
carry astronauts and equipment
capture panoramic surface images
Answer:
D the answer
Explanation:
Answer:
A
Explanation:
Classify objects in space
A board measures 68 inches. How many feet is this?
Answer:
5.66667
Explanation: because you have to take 12 and see how many times it fits into 68. Hope this helps! :^)
What is the chemical composition of PFAS?
Answer:
PFAS molecules are made up of a chain of linked carbon and fluorine atoms. Because the carbon-fluorine bond is one of the strongest, these chemicals do not degrade in the environment.
list 3 substances that have atoms which are bonded.
Answer:
Carbon, Hydrogen, Oxygen, Nitrogen, and Sulfur.
(Those are all the ones I know)
Example of 3 substances that have bonded atoms are :
Water ( H₂0 )Calcium Oxide ( CaO )Table salt ( NaCl )Substances that have chemically bonded atoms are generally known as molecules, while a compound is a substance made up by the chemical bonding of different atoms from different elements. there are some readily available substance in nature that have bonded atoms like ; water and Table salt.
Hence we can conclude that three ( 3 ) examples of substances that have bonded atoms are ; Water, Calcium Oxide and Table salt.
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What are the atom and elements are in the picture?
How many moles of aluminum are needed to form 3. 7 mol al2o3.
Answer
7.4 moles
Explanation
After you cancel out the units of measurement to check the order of the conversion, multiply 3.7 with 4 and then divide the answer by 2 . You get 7.4 moles of Al .
How can you tell a chemical change has happened?
Answer:
You can tell when a chemical change has happened when the chemical changes in appearance such as color or physical state.
Explanation:
If a change happens it can change in any way shape or form.
Bismuth has a density of 9.80 g/cm^3. What is the mass of 3.02 cm^3 bismuth?
Answer:
29.596 g/cm^3
Explanation:
mass=density*volume=9.8*3.02=29.596
how many molecules are in 25g of NH3
Answer:
a viewpoint is a person s way of thinking in general or particular things
porcelain x has much smaller crystals in it than porcelain Y. suggest a reason for that
Answer: 22
Explanation:
Which of the following are considered pure substances
Answer:
There aren't any options given. Maybe you should repost with options or just edit them in.
What characteristics of a molecule determine whether or not it is polar?.
Answer:
The molecules having positively charged end and negatively charged end due to the difference in the charges of atoms present in the molecules are polar molecules. The molecules that do not have such separation of electric charges are nonpolar. Most of the polar molecules have an asymmetric or uneven distribution of electrons.
Explanation:
hope this helps
have an awesome day -TJ
may I please have brainliest
Answer:
The polarity of the individual bonds in the molecule
The arrangement of bonds around the molecule
Explanation:
Hope this helps
Liquids have a density greater than 1 g/m?
Sometimes true? True? never true?
Answer:
Water has a density of 1 g/m so it could be sometimes true
Explanation:
Answer:True
Explanation: If you look it up it says the anwser. Can you give me a thank and a five.
Also very important if you put your question in the search bar and put quizlet after then you can find answer for you test quizes and more.
I hope this helps you and have a great day bye.
quickly, please. If you want to have better frost protection, you can add an excess of 0.0200 moles of salt or 0.0200 moles of sugar. Explain which would result in the greater frost protection – sugar or salt. Justify your response.
The more the number of particles the better the frost protection hence, salt offers a better frost protection than sugar.
What is frost protection?The term frost protection has to do with protection agianst the accumulation of frost or snow.
We have to note that this property depends on the ability of the substance to decrease the melting point of ice. The more the number of particles the better the frost protection hence, salt offers a better frost protection than sugar.
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How to round significant figures
Explanation:
To round to a significant figure:
look at the first non-zero digit if rounding to one significant figurelook at the digit after the first non-zero digit if rounding to two significant figuresdraw a vertical line after the place value digit that is requiredlook at the next digitif it's 5 or more, increase the previous digit by oneif it's 4 or less, keep the previous digit the samefill any spaces to the right of the line with zeros, stopping at the decimal point if there is oneHope it will help you.....Answer:look at the first non-zero digit if rounding to one significant figure.
look at the digit after the first non-zero digit if rounding to two significant figures.
draw a vertical line after the place value digit that is required.
look at the next digit.
Explanation: Google ;DDDD
Balance the following chemical equations:
Problem 1
Pb(SO )2 +
Pb(OH), =
H,SO, +
Н,O
Answer:
2+1=1+4
Explanation:
2h2so4+1pb(oh)4=1pb(so)4+4h2o
A sample of unknown pressure occupies 0. 776L at a temperature of 298K. The sample of gas is then tested under known conditions and has a pressure of 32. 6 kPa and occupies 0. 664L at 303K. What was the original pressure of the gas?
Answer: 27.43 kPa
Explanation:
Use PV / T = PV / T →
P(.776) / (298) = (32.6)(.664) / (303) →
Cross Multiply to get: 235.128P = 6450.6272 →
Divide to get: P = 27.43 kPa :)
how much heat is required to raise the temperature of 50.0g of water 13°C
Answer:one gram by 1oC
Explanation: you will need to know the value of water's specific heat
the mass of an object is 18g and its volume is 9cm^3. sink or float ?
Explanation:
In order to find whether it will sink or float in water we must first find the density of the object
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 18 g
volume = 9 cm³
So we have
[tex]density = \frac{18}{9} \\ [/tex]
We have the density as 2.0 g/cm³
The object will sink in water since it's density is greater than that of water which is 1.0 g/cm³
Hope this helps you
The chemical equation below shows the combustion of propane (c3h8). c3h8 5o2 right arrow. 3co2 4h2o the molar mass of oxygen gas (o2) is 32.00 g/mol. the molar mass of c3h8 is 44.1 g/mol. what mass of o2, in grams, is required to completely react with 0.025 g c3h8? 0.018 grams 0.034 grams 0.045 grams 0.091 grams
The mass of oxygen required to completely react with C₃H₈ is 0.091 grams.
How we calculate moles from mass?Moles of any substance will be calculated as:
n = W/M, where
W = given mass
M = molar mass
Given chemical reaction is:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Moles of 0.025g of C₃H₈ will be calculated as:
n = 0.025g / 44.1 g/mol = 0.00056 moles
From the stoichiometry of the reaction it is clear that:
1 mole of C₃H₈ = react with 5 moles of O₂
0.00056 mole of C₃H₈ = react with 5×0.00056=0.0028 moles of O₂
Now we calculate the mass of oxygen by using the above moles and molar mass as:
W = (0.0028mol)(32.00 g/mol) = 0.0896g = 0.090g
Which is approx to the given valoe 0.091g.
Hence correct option is (d).
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The mass of the sugar in a small sugar packet is about one gram. If we could harness all of the energy contained in the nuclei of atoms in a small sugar packet, how much energy could we obtain?
Select one:
a. 9.00 x 1013 J
b. 3.00 x 105 J
c. 9.00 x 1010 J
d. 9.00 x 1016 J
Answer:
a. 9.00 x 1013 J
Explanation:
Trust me
Which compound, in the liquid phase, conducts electricity best?
Answer:
The answer is salt
Explanation:
I got it right on the quiz
Explain how oxygen causes chemical weathering
Answer:
Oxygen causes oxidation. You can think about oxidation like rust on a car. Rust forms when the iron or steel in your car reacts with the oxygen in the air to form iron oxide. The resulting red substance can be quite brittle, so much so that you could literally poke a hole in it with your finger.
Answer:
Oxidation, which is the chemical reaction of oxygen with other substances, is very effective at weathering minerals that have iron in their chemical formulas. In other words, oxidation is what causes different types of rust.
Explanation:
Hope this helps! Good luck! <3
What are some things that might happen that can change our air so that it is not health for plants?
Answer:
What are some things that might happen that can change our air so that it is not health for plants?
Explanation:
Air pollutants have a negative impact on plant growth, primarily through interfering with resource accumulation. Once leaves are in close contact with the atmosphere, many air pollutants, such as O3 and NOx, affect the metabolic function of the leaves and interfere with net carbon fixation by the plant canopy. Air pollutants that are first deposited on the soil, such as heavy metals, first affect the functioning of roots and interfere with soil resource capture by the plant.