Additional Practice Questions

5. If you had a pH of 4.30 in a 5.00 L sample, how many
moles of hydronium do you have?

Answers

Answer 1

Moles of hydronium (H₃O⁺) : 2.5 x 10⁻⁴

Further explanation

Given

pH = 4.3

V sample = 5 L

Required

moles of H₃O⁺(hydronium)

Solution

pH = - log [H₃O⁺]

4.3 = - log [H₃O⁺]

[tex]\tt [H_3O^+]=10^{-4.3}~M=10^{-4.3}mol/L[/tex]

Moles of hydronium for 5 L sample :

[tex]\tt 5~L\times 10^{-4.3}mol/L=5.10^{-4.3}moles=2.5\times 10^{-4}~moles[/tex]


Related Questions

Over time, repeated cycles of heating and cooling can cause a rock to crack. The rock may then break into smaller pieces. What is this process called?

Answers

erosion is a process that changes rock slowly

what chemical reaction type is Pb + 2 H3PO4 --> 3 H2 + Pb3(PO4)2

Answers

Answer:

single displacement reaction

Explanation:

it is because an atom(Pb) dispalces another atom(H) in H3PI4

The given chemical reaction is single displacement reaction.

What is single displacement reaction?

When one element in a molecule gets replaced by another, is therefore called a single displacement reaction.

The given reaction is Pb + 2 H3PO4 → 3 H2 + Pb3(PO4)2

It can be seen that when lead is treated with H3PO4 then it will give Pb3(PO4)2 and hydrogen reaction. It is a kind of single displacement reaction.

Therefore, the given reaction is single displacement reaction.

To know more about single displacement reaction.

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How many unpaired electrons are present in V3+?​

Answers

Answer: two unpaired

Explanation: In general, electrons are removed from the valence-shell s-orbitals before they are removed from valence d-orbitals when transition metals are ionized. And thus, V3+ is paramagnetic, because it has two unpaired 3d-electrons.

What is the general formula for a secondary anime?
A. RNH2
B.H2NRNH2
C.RN2H
D.R2NH

Answers

Answer:

D.R2NH

Explanation:

The general formula of a secondary amine is given as:

                    R2NH

Amines are organic compounds that show an appreciable basicity. They are regarded as the derivatives of ammonia where one or two of the three hydrogen atoms has/have been replaced by the alkyl or aryl groups.

 In a secondary amine, two hydrogen atoms of ammonia have been replaced by alkyl and or aryl groups.

Answer:

d. R2NH

Explanation:

edge 2021

what’s the answer to this question pls help

Answers

In order of reactivity: magnesium, iron, copper, silver

What makes a pure substance different from a heterogeneous mixture? (4 points)

Answers

Explanation:

Pure substances are elements and compounds. These substances have the following properties:

All parts are the same throughout which implies that they are homogeneous. They have a definite composition. They  cannot be easily separated or broken down into simpler substances by physical meansSeparation by physical means is not possible They have unique sets of physical properties.

Heterogeneous mixtures have completely opposite properties as the pure substances as given above.

During the process of condensation, water vapor does what

Answers

Answer: the water molecules become more organized and heat is released into the atmosphere as a result.

Explanation:

Describe what a geologist would observe if she poured acid on the sculpture

Answers

Answer:

A geologist would observe how the material that the sculpture is made out of reacts to the acid.

A small amount of solid potassium dichromate is added to water and stirred until all of the solid has dissolved and a clear orange liquid is produced. This process may be described as: Group of answer choices the formation of a heterogeneous mixture. dissolution of the molecular compound sublimation. dissolution and dissociation of the ionic compound.

Answers

Answer: dissolution and dissociation of the ionic compound.

Explanation:

Ionic compound is formed by the transfer of electrons.

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.  

Here potassium metal forms [tex]K^+[/tex] cation and [tex]Cr_2O_7^{2-}[/tex] anion which exchange their oxidation states to form [tex]K_2Cr_2O_7[/tex].

When ionic compound is dissolved in water, it dissociates to its respective ions.The ions form bonds with oppositely charged ions of water molecules and thus get dissolved in water called as dissolution.

Which nuclear equation represents a spontaneous decay?

(1) Rn 21% Po + He

(2) 13 Al + He 18P + on

(3) 235 U + in ~ 13% Ba + Kr + 3n

(4) Li + H → He + He

a. 1

b. 2

C 3

d. 4

Answers

Answer:

a. 1

Explanation:

Radon is a member of group 18. It is an odorless heavy gas, that emanates from materials that contain uranium.

Rn is a decay product of 226-Ra, a member of the uranium decay series. The spontaneous  decay of Rn decay leads to the emission of an alpha particle.

Rn has a half-life of about 3.8 days and its decay product is 218Po.

The nuclear reaction which shows a spontaneous decay is Rn 21% Po + He.

What is spontaneous reaction?

Those reaction in which value of their enthalpy change and change in Gibb's free energy is negative, are spontaneous in nature.

Among all of the given reaction, only first reaction is spontaneous in nature because the given element Radon (Rn) is the product of the decay of uranium series. And in this reaction energy is emitted in the form of alpha particles.

Hence, option (1) is correct.

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the melting point of gallium metal is 29.76°C If a piece of gallium is sliced into three parts, the melting point will be:

A. higher than 29.76°C
B. 29.76°C
C. lower than 29.76°C

Answers

Answer:  B. 29.76°C

Explanation:

The melting point is known as an intensive property of matter. This means the melting point is not affected by the amount of mass. Whether the metal is really large or small, the melting point of gallium (Ga) is roughly 29.76 degrees Celsius.

hi can you pls help :)

Answers

Answer:i think it is c, it explodes in water because that’s a chemical reaction

Explanation:

When 29 grams of sodium metal (Na) react with 49 grams of chlorine gas (C1), solid
sodium chloride (NaCl) is created in synthesis reaction. How much excess sodium OR
chlorine is left over?

Answers

Answer:

Explanation:

Na     +     Cl    =      NaCl

23 g        35.5 g  

23 g sodium reacts with 35.5 g of chlorine

29 g of sodium reacts with 35.5 x 29 / 23 g of chlorine

= 44.76 g

So 44.76 g of chlorine reacts and 49 - 44.76 = 4.24 g of chlorine is left over .

All the sodium is used up in the reaction .

Use the drop-down menus to complete the statements.


A segment of DNA is called a
.

A complex of nucleic acids and proteins that make up chromosomes is called
.

A structure in the nucleus of an eukaryotic cell that is made up of condensed DNA is called a
.

Answers

A segment of DNA is called a  gene.

A complex of nucleic acids and proteins that make up chromosomes is called  Chromatin

A structure in the nucleus of an eukaryotic cell that is made up of condensed DNA is called a  chromosome.

Answer:

1. Gene

2. Chromatin

3. chromosome

Explanation:

I hope this helps you :)

DUE IN A FEW!!!!!! PLS HELP

Answers

Answer:

the answer is is C 465 grams

the answer is c ......

what type of potential energy do fuels contain

Answers

Kinetic energy maybe or something

Answer:

It contains chemical potential energy.

Explanation:

The uncertainty in the measurement 1500 m is

Answers

Answer:

Its 1500 meters, which is equal to 0.9320568 miles. Hope this helps!

Explanation:

Iodine monochloride (ICl) has a higher boiling point than bromine (Br2) partly because iodine monochloride is a(n)

Answers

Answer: polar molecule.

Explanation:

The boiling point is the temperature at which the vapor pressure of a liquid equals the external pressure surrounding the liquid. The boiling point is dependent on the type of forces present.

Iodine monochloride (ICl) is a polar molecule due to the difference in electronegativities of iodine and chlorine. Thus the molecules are bonded by strong dipole dipole forces. Thus a higher temperature is needed to generate enough vapor pressure.

Bromine [tex](Br_2)[/tex] is a non polar molecule as there is no electronegativity difference between two bromine atoms. The molecules are bonded by weak vanderwaal forces and thus has low boiling point.

A balloon is filled with helium gas has a volume of 1.0 L at a pressure of 1.0 atm. The
balloon is released and reaches an altitude where the pressure is now 0.4 atm. What is the
new volume of the balloon at this altitude assuming the air temperature has not changed?

Answers

Answer:

2.5 L

Explanation:

The new volume of the balloon can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

Since we are finding the new volume

[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]

From the question we have

[tex]V_2 = \frac{1 \times 1}{0.4} = \frac{1}{0.4} \\ = 2.5[/tex]

We have the final answer as

2.5 L

Hope this helps you

Which has a greater ionization energy: lithium or bromine? Which has a greater ionization energy: vanadium or sodium?

Answers

1.Lithium has the greater ionization energy
2. Vanadium has a greater ionization energy

6. Would you describe each of these temperatures as warm, hot, or cold?
b. 60 °C
a. 100 K
c. 250 K
d. 25 °C
e.
300 K
f. -100 °C
g. 400 K

Answers

Answer:

b: Hot

a: Cold

c: Cold

d: Warm

e: Warm

f: Cold

g: Hot

Explanation:

:)

Please help... its due today and my teacher isn't explaining very good I have 100 points will give 40 to you a brainliest and thanks answers are at the bottom but I need the work done also

Answers

Answer:

2Na2O2 + 2H2O → 4NaOH + O2 is the balanced ver of Na2O2 + H2O - NaOH + O2

Explanation:

As of January 2009, the USA has produced 60,000 metric tons of nuclear waste in 60 yesrs of operating 104 nuclear power plants.

on average how much waste is produced by each plant on a monthly basis?

a. 0.8 tons p. month

b. 83.3 tons p. month

c. 104 tons p. month

d. 866.3 tons p. month

Answers

Answer:  a. 0.8 tons p. month.

Explanation:

Given: Total nuclear waste = 60,000 metric tons

Time take = 60 years = 12 x 60 months   [ 1 year = 12 months]

=  720 months

Total nuclear power plants = 104

Now , Average  waste produced by each plant = [tex]\dfrac{\text{Total waste}}{\text{Time x Number of plants}}[/tex]

[tex]=\dfrac{60000}{720\times104}\approx0.8\text{ tons per month.}[/tex]

Hence, 0.8 tons p. month is produced by each plant.

So, option a. is correct.

Answer:

A on edge 2021

Explanation:

How much current is drawn by a 40-W bulb in a 120-V circuit?

Answers

Since power, P, equals iV, P/V = i, so at 120 V, a 40-watt bulb draws 1/3 A.

What is the molar mass of Sn(CO3)2?

Answers

Answer:

The molar mass and molecular weight of Sn(CO3)2 is 238.728.

Explanation:

Molar mass of any molecule can be calculated by adding mass of all individual atoms  that comprises the compound. The Molar mass of [tex]Sn(CO_{3})_{2}[/tex] is 238.72g/mol.

What is molar mass?

Molar mass is defined as mass of one mole of a molecule or compound. It's SI unit is g/mole. The other term that is used for molar mass is molecular weight, formula unit mass. Molar mass is extensive property as it depends on the mass of individual atoms that constitutes the molecule.

Mass of tin= 118.71 g.mol

Mass of Carbon=12g/mol

mass of Oxygen= 16g/mole

Molar mass of [tex]Sn(CO_{3})_{2}[/tex] = 1×mass of tin+2×mass of carbon+6×mass of oxygen

substituting all the values we get

Molar mass of [tex]Sn(CO_{3})_{2}[/tex] = 1×118.71+2×12g/mol+6× 16g/mole

Molar mass of [tex]Sn(CO_{3})_{2}[/tex] =118.71 +24+66

Molar mass of [tex]Sn(CO_{3})_{2}[/tex]=238.72g/mol

Therefore the Molar mass of [tex]Sn(CO_{3})_{2}[/tex] is 238.72g/mol

To know more about Molar mass, here:

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HEY! Nicki Minaj is the queen of rap.

Answers

Answer:

O my OMG

Explanation:

Remember Nicki vs. Cardi

yuh yuh sjbsixbsksshsjwbq

What does it mean when you ask your dad whats he going to do with the chikens and hes says feed them some fried chiken?

Answers

Answer:

It means your dad is making those chickens cannibal's.......

Explanation:

Answer:

Hes gonna cook those chickens.....

what is the smallest atomic radius

Answers

Answer:

Helium

Explanation:

Helium has the smallest atomic radius. This is due to trends in the periodic table, and the effective nuclear charge that holds the valence electrons close to the nucleus.

plzz help guyss I'm so confused
Starting from rest, you reach a speed of 20 m/s in 4 seconds. What is your acceleration? ​

Answers

5 because A=v/t 20/4=5

covalent bonds always share electrons equally
A: True
B: False

Answers

FalseAtoms do share electrons when they form covalent bonds, but they do not usually share the electrons equally.

I hope this helped! +*♡

It should be false:)
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