Answer:
4.7Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log [ {H}^{+} ][/tex]
From the question we have
[tex]ph = - log(1.8 \times {10}^{ - 5} ) \\ = 4.7447[/tex]
We have the final answer as
4.7Hope this helps you
Which of these is true for natural selection but not artificial selection?
A.Humans choose specific organisms to reproduce.
B.Competition for resources determines reproductive success.
C.Unfavorable traits decrease in frequency in a population.
D.Genetic engineering introduces new traits into a population.
Answer:
B
Explanation:
What is the simplest whole number ratio of atoms in a molecule or formula unit called?
the molecular formula
the molar mano
the percent composition
the empirical formula
PLEASE HELPP
The word habitable is defined as:
A chemist has three different acid solutions. The first acid solution contains 15 % 15% acid, the second contains 35 % 35% and the third contains 80 % 80% . They want to use all three solutions to obtain a mixture of 190 190 liters containing 30 % 30% acid, using 2 2 times as much of the 80 % 80% solution as the 35 % 35% solution. How many liters of each solution should be used
Answer:
First solution = 133L
Second solution = 19L
Third solution = 38L
Explanation:
As we want to make 190L of a 30%=0.3 solution we can write:
190L*0.3 = a*0.15 + b*0.35 + c*0.80
Where a, b and c are the volume of first, second and third acid solutions, respectively.
The volume of c is twice volume of b:
c = 2b
And the volume of the 3 solutions is equal to 190L:
190L = a+b+c
190L = a+3b
190L*0.3 = (190-3b)*0.15 + b*0.35 + 2b*0.80
57 = 28.5-0.45b+0.35b+1.6b
28.5 = 1.5b
b = 19L
c = 2*19L
c = 38L
a = 190L - 19L - 38L
a = 133L
Plutonium-196 has an atomic number of 78. It has ____ neutrons.
Answer:
118 neutrons
Explanation:
There are three subatomic particles in an atom namely: electron, neutron and proton. The mass number of an atom is calculated by adding the proton no. (atomic mass) + neutron no.
That is;
Mass no. = proton no. + neutron no.
This means that to obtain the neutron no. in the atom of an element, we subtract the no of protons or atomic mass from the mass number.
According to this question, Plutonium-196 is said to have an atomic number of 78. The mass no. is 196, hence, the number of neutrons is:
196 - 78
= 118 neutrons.
It is the gametes formation of a sex cells or reproductive cells.
Answer:
Meiosis
Explanation:
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Answer:
sana makatulong po sainyo
how many moles are in 150 grams of water
Answer:
Solution given:
H20=1+1+16=18grams
we have
1 mole of water =18grams
now
150grams of water=1/18*150=25/3 =8.33mole.
150 grams of water =8.33mole.
Note:
mole =given mass/actual mass of molecule/atom
1 mole of water is 18 grams.
Then,
150 grams of water,
→ 1/18 × 150
→ 25/3
→ 8.33333 . . .
Hence, 150 grams of water is 8.3 moles.
A solution in which the [H+] is 1.0 X 10-4 mol/L is said to be:
Which element has the highest first ionization energy?
a. phosphorus
b. aluminum
c. sodium
d. calcium
Answer:
A) Phosphorus
Explanation:
Look At Question 5) On The Answer Key
The element phosphorus has the greatest first ionization energy.
What is the first ionization energy?The first ionization energy of an element is the energy that is required to remove an electron from the outermost shell of an atom of the element.
We know that ionization energy decreases down the group but increases across the period thus the element phosphorus has the greatest first ionization energy.
Learn more about ionization energy:https://brainly.com/question/16243729?
#SPJ6
How many atoms are in 0.432 g of KNO3? Round your answer to three significant
figures.
A…2.58 x 1021
B…7.10 x 10-27
C…0.00428
D…43.6
A
I did it and got this but it know the first one is right as it only missing of some point it will be calculator error and also the answer is to the power of 21.
hope this make sense :)
If the pH of a solution is 3, its pOH is
Explanation:
If the pH of a solution is 3, its pOH is 14-3= 11
Which has more molecules in it 10g H, 0 or 10g NaCl*
A)010g of H0
B)10g of NaCl
C)They have the same number of molecules
D)Cannot be determined
Answer:
10 grams of hydrogen
Explanation:
how a forensic scientist may match DNA of evidence to a particular crime?
Select the correct answer.
What does the empirical formula of a compound describe?
Ο Α. .
the type and number of atoms
OB.
the type and ratio of atoms
O C.
the number of atoms
OD
the type and mass of atoms
Reset
Next
Answer:
b
Explanation:
cause empirical formular is the elementary or the foundation for molecular formula and molecular formula depends on the empirical formula
How many milliliters of 5.0 M NaOH are needed to exactly neutralize 40. milliliters of 2.0 M HCl?
Answer:
16mL
Explanation:
Using the following formula;
CaVa = CbVb
Where;
Where
Ca = concentration/molarity of acid (M)
Va = volume of acid (mL)
Cb = concentration/molarity of base (M)
Vb = volume of base (mL)
According to the information provided in this question;
Ca (HCl) = 2M
Cb (NaOH) = 5M
Va (HCl) = 40mL
Vb (NaOH) = ?
Using CaVa = CbVb
Vb = CaVa/Cb
Vb = 2 × 40/5
Vb = 80/5
Vb = 16mL
I. Witch direction does the electric field point at a position directly west of a positive charge
Answer:
The answer is North
Explanation:
The direction of the field is taken to be the direction of the force it would exert on a positive test charge.
mention two examples each of solid liquid and gaseous Alkanes
Answer:
gas ; methane , ethane
liquid ; octane , hexane
Explanation;
i cant find solid dear
pls help anyone with an example of a solid alkanes
The compounds that form from the bonding of the hydroxyl group (-OH) to a hydrocarbon are called the aldehydes.
True
False
Answer:
False.
I just got it right, lol.
How many grams are in 2.000 moles of Cl2
Answer:
141.8g
Explanation:
because n(cl)=m(cl)/M(cl)
Which term is used to measure a star's brightness?
Answer:
Magnitude
Explanation:
Astronomers define star brightness in terms of magnitude (how bright the star appears from Earth)
Why can’t neon store energy in this way?
Answer:
Neon is a noble gas, it is monoatomic in nature, which implies that it has only one atom present. If we compare neon with water, water has three atoms present, two hydrogen atoms and one oxygen atom. Hence water stores more energy than neon because it is polyatomic and contains chemical bonds.
Given the reaction:
Ca + 2H,0→ Ca(OH)) + H2
How many moles of H,O are needed to exactly react with
2.0 moles of Ca
Answer:
4
Explanation:
because use the molar ratio of
ca:h2o
1:2
2;4
so u times it by 2 .
hope this helps:)
How many centimeters are in 5 miles? Hint: 1 miles = 5280 feet
How many liters of hydrogen gas will be produced at STP from the reaction of 5.159 x 1021 atoms of magnesium with 55.23 g of phosphoric acid (H3PO4)?
3 Mg + 2 H3(PO4) Mg3(PO4)2 + 3 H2
Answer:
0.190L of hydrogen may be produced by the reaction.
Explanation:
Our reaction is:
3Mg + 2H₃PO₄ → Mg₃(PO₄)₂ + 3H₂
We need to determine the limting reactant. Let's find out the moles of each:
5.159×10²¹ atoms . 1 mol / 6.02×10²³ atoms = 0.00857 moles of Mg
55.23 g . 1 mol / 97.97 g = 0.563 moles of acid
2 moles of acid react to 3 moles of Mg
0.563 moles of acid may react to: (0.563 . 3) /2 = 0.8445 moles of Mg
Definetely the limting reactant is Mg.
As ratio is 3:3, 3 moles of Mg can produce 3 moles of hydrogen
Then, 0.00857 moles of Mg must produce 0.00857 moles of H₂
At STP, 1 mol of any gas occupies 22.4L
0.00857 mol . 22.4L / 1mol = 0.190L
Use the reaction N2(g) + 3H2(g) 2NH3(g) to answer the following questions
a. 1 pt: What does Le Châtelier's principle predict would happen to the equilibrium conditions if N2(g) + 3H2(g) were added to the system?
b. 1 pt: What would happen to the equilibrium if the pressure were decreased?
c. 2 pts: Write the equation for calculating Keq
d. 3 pts: Calculate the value for Keq given the following concentrations
[NH3] = 6 M
[H2] = 4 M
[N2] = 3 M
Answer:
K
C
=
[N
2
][H
2
]
3
[NH
3
]
2
N
2
+3H
2
⇌2NH
3
=
(1.5×10
−2
)(3×10
−2
)
3
(1.2×10
−2
)
2
=
1.5×10
−2
×27×10
−6
1.44×10
−4
=
40.5×10
−4
1.44
=0.035×10
4
Can some answer this?
GIVE BRAINLIEST
Which property of water helps it maintain a relatively stable temperature?
The property of water that helps it maintain a relatively stable temperature is the presence of hydrogen bonds.
The properties of waterWater is an odourless, tasteless and colourless compound that is made up of hydrogen and oxygen atoms.
The properties of water include the following:
it is a polar solvent,it has high specific heat capacityHigh surface tension, andStable boiling and freezing points.The stable temperature of water, that is the ability to have a constant boiling and freezing points, is as a result of the hydrogen bonds existing between the water molecules.
The hydrogen bonds gives water molecules ability to hold heat better than any other substance.
Learn more about water properties here:
https://brainly.com/question/18681949
Answer: High specific heat capacity
Explanation:
I took the test
How many grams of silver nitrate will be needed to produce 8.6 g of silver?
Answer:
13.5g of AgNO3 will be needed
Explanation:
Silver nitrate, AgNO3 contains 1 mole of silver, Ag, per mole of nitrate. To solve this problem we need to convert the mass of Ag to moles. Thee moles = Moles of AgNO3 we need. With the molar mass of AgNO3 we can find the needed mass:
Moles Ag-Molar mass: 107.8682g/mol-
8.6g * (1mol / 107.8682g) = 0.0797 moles Ag = Moles AgNO3
Mass AgNO3 -Molar mass: 169.87g/mol-
0.0797 moles Ag * (169.87g/mol) =
13.5g of AgNO3 will be neededanother name for constant boiling mixture
Answer:
Azeotrope
Explanation:
An azeotrope is a liquid mixture that has a constant boiling point and whose vapor has the same composition as the liquid
Another name for constant boiling mixture.
[tex]\sf\purple{Azeotrope.}[/tex] ✅
An azeotrope or a constant boiling point mixture is a mixture that has the same composition in liquid and vapour phase.[tex]\large\mathfrak{{\pmb{\underline{\orange{Happy\:learning }}{\orange{!}}}}}[/tex]
Explain why the buffering action of these chemical reactions is limited by the present day rate of change for atmospheric CO2 concentration
Answer:
Due to increase in carbondioxide gas.
Explanation:
The buffering action of these chemical reactions is limited by the present day rate of change for atmospheric carbondioxide concentration because the the rate of atmospheric carbondioxide rises as compared to ancient atmospheric carbondioxide gas. Due to increase of human activities, the concentration of carbondioxide gas increases in the atmosphere which limits the buffering action of these chemical reactions so we can say that carbondioxide gas is responsible for its limited action.