Answer:
0.87708moldm-3
Explanation:
[tex]molar \: mass \: of \: cuso4 = 63.55 + 32.07 + 4(16.00) \\ =159.62gmol {}^{ - 1} \\ mole(n) = \frac{mass}{molar \: mass } \\ n = \frac{35}{159.62} \\ n = 0.21927mol \\ molarity = \frac{n}{v} \\ molarity = \frac{0.21927}{0.25} \\ molarity = 0.87708moldm {}^{ - 3} [/tex]
Amphetamine (C9H13N) is a weak base with a pKb of 4.2.
Calculate the pH of a solution containing an amphetamine concentration of 215 mg/L .
Express your answer to two decimal places.
Weak base: [OH⁻] = √Kb.C
pKb = 4.2
[tex]\tt Kb=10^{-4.2}[/tex]
c = concentration
MM Amphetamine (C9H13N) = 135.21 g/mol
c = 215 mg/L = (0.215 g : 135,21 g/mol) / L = 0.00159 mol/L = 1.59 x 10⁻³ mol/L
[tex]\tt [OH^-]=\sqrt{10^{-4.2}\times 1.59\times 10^{-3}}=3.17\times 10^{-4}[/tex]
pOH = 4 - log 3.17
pH = 14 - (4 - log 3.17)
pH = 10 + log 3.17 = 10.50
Which is most reactive out of calcium, potassium, and magnesium?
Answer:
As we have already discussed, reactivity of alkali metals tends to increase as you go down the group. Therefore, sodium is less reactive with water than is potassium, likewise with the alkaline metals; calcium is more reactive than magnesium
In this circuit, energy is transferred from a battery to a circuit wire and then to a light bulb, where some of it leaves the system. Starting from the battery, which series shows the correct order of energy transformations taking place in this circuit?
light and heat
chemical
electrical
put them in order
Answer:
chemical electrical light heat
1. Can you please put the following chromatography solvents in order of polarity as a chromatography solvent: acetone, n-propanol,
water, hexane, diethyl ether, methanol and explain
2. chromatography with a mixture of n-propanol and water. Would it make sense to add hexane to this mixture to try and make it work better? why?
3. The basic food colors you can buy are red, blue, green, and yellow. Think about what you know about colors
and predict which of these might be a single colored compound and which ones might contain more than one.
Write down your prediction. If you have the colors listed and want a purple color, what would you do?
The order of increasing polarity of the solvents is; hexane< diethyl ether < acetone < n-propanol < methanol < water
What is chromatography?Chromatography literarily means "color writing". It provides a means of separating the components of a mixture based on its components.
The solvent in chromatography is the mobile phase while the adsorbent is the stationary phase. The order of increasing polarity of the solvents is; hexane< diethyl ether < acetone < n-propanol < methanol < water
If we have a mixture of n-propanol and water, it would be good to add hexane to the mixture for the sake of the elution of non-polar solutes.
The secondary color green may be composed of more than one color while red, blue and yellow are single colors.
Learn more about chromatography: https://brainly.com/question/26491567
1) Identify two different mineral nutrients present in the fertilizer
that helped the plant recover. Then, describe how each nutrient
benefits the plant.
The two different mineral elements that a fertilizer can contain are:
Phosphorus - build up of nucleic acid and ATPNitrogen- synthesis of proteinsWhat are fertilizers?Fertilizers are chemical substances added to the soil in order to improve crop growth and development.
Fertilizers are artificially made to contain mineral elements that are needed by the plants. Some of the mineral elements are as follows:
PhosphorusNitrogenPottasiumPhosphorus helps in the build up of nucleic acids and ATP for energy. Nitrogen is useful in the synthesis of proteins.Learn more about minerals at: https://brainly.com/question/18078524
Answer:
is the answer above right? im literally struggling rn
Explanation:
What are valence electrons?
A electrons in the outermost level of each atom
B electrons found in the s or p orbitals of atoms
C electrons in the innermost level of each atom
D electrons produced by the radioactive decay of the nucleus of an atom
A electrons in the outermost level of each atom
Calculate the % by mass concentration for each of the following solutions. Match the answers.
1.25g NaCl in 100.0g of solution = [a]%
ce
2.50g K2Cr2O7 in 96.0g of solution = [b]%
nts
10.0g CaCl2 in 250.0g of solution = [c]%
ns
20.0g Kl in 100.Ogof solution = [d]%
The percentage by mass of each of the compounds would be 40%, 2.6%, 4%, and 20% respectively
Percentage by massThe percentage by mass of a substance is given by:
Percent by mass = mass of substance/mass of solution x 100%.
For NaCl: Percent by mass = 25/100 = 40%For K2Cr2O7: Percent by mass = 2.50/96 = 2.6%For CaCl2: Percentage by mass = 10/250 = 4%For KI: Percent by mass = 20/100 = 20%More on percentage by mass can be found here: https://brainly.com/question/27108588
Calculating Moles of Particles
QUICK CHECK
How many moles of particles are formed by dissolving one mole of each of the following in water?
Ethanol
CaCl2
5 X = 1 mole(s) of particles
25 X = 3 mole(s) of particles
COMPLETE
COMPLETE
(NH4)2SO4
Sucrose
mole(s) of particles
3 X = 1 mole(s) of particles
DONE
COMPLETE
Na2HPO4
mole(s) of particles
3
Answer:
check the picture down below
Explanation:
If a Hh mom has an offspring with a hh dad, what is the probability that the offspring will have a dominant phenotype?
Question 2 options:
20%
10%
50%
40%
Answer:
I think 50%
Explanation:
im not really sure
Explain how oxygen and carbon dioxide move with breathing.
Answer/Explanation:
With oxygen, it is what you breathe in so obviously, it is going to move around into your body. But with carbon dioxide, it is what you breathe out. When you breathe in, your body takes in the oxygen and the releases the carbon dioxide. Carbon dioxide is what plants actually consume, while they release oxygen.
I hope this helps!
-No one
the pH of an acidic solution is 2.47. what is the [H+]
[tex]pH=-\log[H^{+}]\\\\\implies [H^{+}] =10^{-pH}=10^{-2.47}=0.0034~M[/tex]
How many moles of HCl are in 57 mL of 0.17 M HCl ?
[tex]\text{Given that,}\\ \\\text{Volume,}~V= 57 mL = 0.057 L\\\\\text{Molar concentration,}~ S = 0.17 ~mol/L\\\\\text{Number of moles,} ~ n=?\\\\S = \dfrac{n}{V} \\\\\implies n = SV = 0.17\times 0.057 =0.00969 ~mol ~ HCl[/tex]
23.4 grams of Al2(SO3)3 is yielded through a chemical reaction. How many moles is this?
Answer:
.0796 mole
Explanation:
Al2 (SO3)3 add the molecular weights
2 * Al = 2 * 26.982 +
3 * S = 3 * 32.06 +
9 * O = 6 * 15.999 = 294.135 gm per mole
Now... you have 23.4 grams of this substance
23.4/294.135 = .0796 mole
EDITED !
What is the difference between metallic and non metallic oxides?
Answer:
Metal oxides are compounds composed of metal ions and oxide ions. Nonmetal oxides are compounds composed of nonmetal atoms and oxygen atoms. The main difference between metal oxides and non metal oxides is that metal oxides are basic compounds whereas nonmetal oxides are acidic compounds.
Explanation:
have a great day ahead
tC
Answer:
Metals react with oxygen to form metallic oxide while Nonmetals react with oxygen to form non-metallic oxide. metallic oxides are basic in nature while Nonmetallic oxides are acidic in nature.
Metal oxides are compounds composed of metal ions and oxide ions. Nonmetal oxides are compounds composed of nonmetal atoms and oxygen atoms. The main difference between metal oxides and non-metal oxides is that metal oxides are basic compounds whereas nonmetal oxides are acidic compounds.
METALS:
Metals usually do not combine with hydrogen. Only a few reactive metals combine with hydrogen to form ionic metal hydrides.
--------------------------------------------------------------------
NON-METALS:
Non-metals react with hydrogen to form stable, covalent hydrides.
Explanation:
Have a great rest of your day
#TheWizzer
What type of molecule is cis-2-pentene?
O A. Alkane
B. Alkyne
C. Branched alkane
D. Alkene
The given molecule, cis-2-pentene, is an Alkene. The correct option is D. Alkene
Saturated & Unsaturated HydrocarbonsAlkanes, Alkenes, and Alkynes are examples of simple hydrocarbons.
Alkanes are the simplest organic compounds. They have only single bonds between carbon atoms and are called saturated hydrocarbons. Their nomenclature usually ends in -ane.Alkenes on the other hand have at least one carbon-carbon double bond. Their nomenclature usually ends in -ene. Alkynes have one or more carbon-carbon triple bonds.Their nomenclature usually ends in -yne. Alkenes and alkynes are called as unsaturated hydrocarbons.The given molecule is cis-2-pentene
Since the name of the molecule ends in "ene", the molecule is an Alkene.
Hence, the given molecule, cis-2-pentene, is an Alkene. The correct option is D. Alkene
Learn more on Saturated & Unsaturated Hydrocarbons here: https://brainly.com/question/24324797
Answer: Alkene
Explanation: just took tha test
Which statements describe the motion of the object represented by the graph? Select three options.
The object is moving away from the origin.
The object is moving towards the origin.
The object started at the origin.
The object started at 2 meters.
The object is traveling at a constant velocity.
Answer:
The object is moving away from the origin.
Explanation:
Answer:
The object is moving away from the origin
The object started at 2 meters.
The object is traveling at a constant velocity.
Explanation:
The line on the graph is moving in the upward direction which means the farther right on the graph you go the farther up the line is. The line also has a constant slope which indicates that the object is moving at a constant rate. and if you look at x=0 the y=2 so therefor the object started at 2 meters.
1) A solution is prepared with 0.55 M HNO2 and 0.75 M KNO2. Fill in the ICE Table with the appropriate values
2) The Ka for this solution of HNO2 is 6.8x10^-4. Based on the ICE table, set up the expression for Ka.
3) Based on your ICE table, determine the pH of the buffer solution
Based on the calculations through the ICE table, the pH of the buffer solution is equal to 3.30.
Given the following data:
Concentration of [tex]HNO_2[/tex] = 0.55 M.Concentration of [tex]KNO_2[/tex] = 0.75 M.Rate constant = [tex]6.8 \times 10^{-4}[/tex]How to determine the pH of the buffer solution.First of all, we would write the properly balanced chemical equation for this chemical reaction:
[tex]HNO_2(aq)\rightleftharpoons H^{2+} (aq)+ KNO_2^{-}(aq)[/tex]
Initial cond. 0.55M 0 0.75M
[tex]\Delta C[/tex] -x x x
At equib. 0.55M - x 0 + x 0.75M + x
From the ICE table, the Ka for this chemical reaction is given by:
[tex]K_{a}=\frac{[H^+][NO_2^+]}{HNO_2} \\\\H^+ = K_{a}\frac{[HNO_2]}{[NO_2^+]} \\\\H^+ = 6.8 \times 10^{-4} \times \frac{0.55}{0.75} \\\\H^+ = 6.8 \times 10^{-4} \times 0.733\\\\H^+ = 4.98 \times 10^{-4} \;M[/tex]
Now, we can calculate the pH of the buffer solution:
[tex]pH=-log[H^+]\\\\pH=-log[4.98 \times 10^{-4}]\\\\pH=-(-3.30)[/tex]
pH = 3.30.
Alternatively, you can calculate the pH of this buffer solution by applying Henderson-Hasselbalch equation:
[tex]pH =pka+ log_{10} \frac{A^-}{HA}[/tex]
Where:
HA is acetic acid.[tex]A^-[/tex] is acetate ion.Read more on concentration here: https://brainly.com/question/3006391
How many grams of FeCo3 will be produced from 57.2g FeCl2
Answer:
287.30 g of FeCO₃
Solution:
The Balance Chemical Equation is as follow,
FeCl₂ + Na₂CO₃ → FeCO₃ + 2 NaCl
Step 1: Calculate Mass of FeCl₂ as,
Molarity = Moles ÷ Volume
Solving for Moles,
Moles = Molarity × Volume
Putting Values,
Moles = 2 mol.L⁻¹ × 1.24 L
Moles = 2.48 mol
Also,
Moles = Mass ÷ M.Mass
Solving for Mass,
Mass = Moles × M.Mass
Putting Values,
Mass = 2.48 mol × 126.75 g.mol⁻¹
Mass = 314.34 g of FeCl₂
Step 2: Calculate Mass of FeCO₃ formed as,
According to equation,
126.75 g (1 mole) FeCl₂ produces = 115.85 g (1 mole) FeCO₃
So,
314.34 g of FeCl₂ will produce = X g of FeCO₃
Solving for X,
X = (314.34 g × 115.85 g) ÷ 126.75 g
X = 287.30 g of FeCO₃
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b. How many grams of H20 is needed to react with 20.0 grams of P4010
P4010 + 6H20 -----> 4H3PO4
20
12 3.2
12bw
7. A certain music box ha the shape of a cube. Ea
cm long. What is the surface area of the box?
8. Find the amount of tin needed to make a milk to
cm and a height of 5cm.
9. Angelo is wrapping a present. The box he is using is
of 10 cm, a width of 7 cm and a height of 5 cm. Find
gift wrapper he needs to wrap the entire box?
10.
The side of the a cube measures 12 cm. Sc
a
A 30.4ml sample of 2.38 M solution of KCI (molar mass = 74.55 g/mol) is prepared. How many grams of KCI are in the solution?
Do not report units in your answer. Report your answer with two places past the decimal point.
ignore this, it wont let me exit this screen/ tab for some reason..
help me this is due soon
Answer:
Hot magma change climate continents drift block sunlight folded mountains form rock deposits
Explanation:
brainliest now
Between a water molecule and an anion, like Cl-, a _____A_____ occurs between a _____B_____ of the water molecule and the anion.
Between a water molecule and an anion, like Cl-, a hydrogen bon occurs between hydrogen atom of the water molecule and the anion.
What is hydrogen bond?Hydrogen bond is a weak bond between two molecules resulting from an electrostatic attraction between a proton in one molecule and an electronegative atom in the other. Hydrogen atom in water molecule attract anion due to presence of hydrogen bond.
So we can conclude that hydrogen bond occurs between hydrogen atom of the water molecule and the anion.
Learn more about bond here: https://brainly.com/question/819068
Answer:
Explanation:88766
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Nitrogen (iv) oxide is passed through the combustion tube before copper is heated.Give a reason for this?
to generate steam which act on copper
All of the following are sources of air pollution EXCEPT
-mobile sources
- Factories
-scrubbers
-Landfills
Answer:
Mobile sources
..........................
Oxidation Number of Carbon in C6H12O6
Correct option is C)
C
6
H
12
O
6
6x+12−12=0
C has oxidation number = 0
Sorry if my answers wrong.
Identify the independent /manipulated variable
Answer:
independent- test variable
manipulated - outcome variable; if needed, there could be changes.
Explanation:
knowledge
Calculate the normal concentration of a solution containing 20.8 g in 400 ml.
Answer:
52 g/L
Explanation:
First, 400 mL / 1000 = 0.4 L
20.8 g / 0.4 L = 52 g /L
Which of the following represents the velocity of a moving object?
Select one:
40 m north.
40.
40 m/s north.
40 m/s.
Answer:
The correct answer would be 40 m/s
Explanation:
The reason 40 m/s is the correct answer is because m/s stands for meters per second.
Hope this helps you with what you're working on! :D
Answer:
40 m/s north
Explanation:
Velocity is a vector quantity, so it have both direction and magnitude.
How many kJ of heat do you need to raise the temperature of 200 g of Aluminum from 80 °C to 100 °C?
Remember to convert your answer to kJ. Round your answer to two decimal places.
Answer:
0.01
Explanation:
100 -80=20
200/20=10/1000=0.01kj
Explain ionization suppressants as applied to atomic spectrometry
An ionization suppressor is an alkali metal capable of preventing ionization, which can be used in atomic spectroscopy to determine matter composition.
What is ionization?Ionization refers to the phenomena capable of converting neutral atoms/molecules to electrically charged atoms/ions.
Ionization is a process by which radiation (e.g., alpha, beta, gamma rays) can pass energy to inert matter.
Some examples of ionization suppressors include salts of alkali metals (for example, potassium), which can be used in atomic spectroscopy to determine matter composition.
Learn more about ionization here:
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