Answer: In a mixture, substances are generally just mixed and are not completely dissolved. In a solution, substances are dissolved completely and they cannot be filtered out.
Explanation:
It required 25.0 mL of 0.333 M NaOH solution to completely neutralize 15.0 11 mL of HCl solution. What was the molarity of the HCI? *
0.555 M
0.200 M
1.11 M
0.277 M
Answer:
A
Explanation:
HCl and NaOH is a strong acid and strong base, respectively, and hence dissociates completely and reacts to form water:
[tex]\displaystyle \text{H}_\text{(aq)}^+ + \text{OH}_\text{(aq)}^- \longrightarrow \text{H$_2$O}_\text{($\ell$)}[/tex]
We are given that 25.0 mL of 0.333 M NaOH was used to neutralize 15.0 mL of HCl.
Convert from moles of NaOH used to moles of HCl reacted:
[tex]\displaystyle \begin{aligned} 25.0\text{ mL} & \cdot \frac{0.333\text{ mol NaOH}}{1\text{ L}} \cdot \frac{1\text{ L}}{1000\text{ mL}} \cdot \frac{1\text{ mol OH}^-}{1\text{ mol NaOH}}\cdot \\ \\ & \cdot\frac{1\text{ mol H}^+}{1\text{ mol OH}^-} \cdot \frac{1\text{ mol HCl}}{1\text{ mol H}^+}\\ \\ & = 8.33\times 10^{-3}\text{ mol HCl}\end{aligned}[/tex]
Therefore, the molarity of the original HCl solution is:
[tex]\displaystyle \begin{aligned} \ [\text{HCl}] & = \frac{\text{ mol HCl}}{\text{L soln.}} \\ \\ & =\frac{8.33\times 10^{-3}\text{ mol HCl}}{15.0\text{ mL}} \cdot \frac{1000\text{ mL}}{1\text{ L}} \\ \\ & = 0.555\text{ M}\end{aligned}[/tex]
In conclusion, our answer is A.
Given bh3, o3, co2, and nh3, which of these compound is an exception to the octet rules?.
Answer:
a. BH₃
Explanation:
According to the octet rules, atoms reach stability when are surrounded by eight electrons in their valence shell when they combine to form a chemical compound.
From the options, the only compound in which the central atom does not meet the octet rules is BH₃. The central atom is boron (B), which has 3 electrons in its valence shell. When B is combined with hydrogen (H), 3 electrons from the 3 atoms of H are added. The total amount of electrons is 6, fewer than 8 electrons needed to meet the rule.
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Mosquitoes are responsible for transmitting the zika virus. In this case, the mosquitoes are
the disease.
asymptomatic transmitters.
biological vectors.
pathogens.
active carriers.
Answer:
active carriers
Explanation:
Mosquitoes are responsible for transmitting the zika virus. In this case, the mosquitoes are active carriers
Answer:
E -- active carriers
Explanation:
the mosquitos would be active carriers...
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Describe the different seasonal changes of the weasel in Florida and the weasel in Wyoming during the
winter season.Science
Answer:
molting allows for this adaptaion.
its fur slowly changes color
thanks!
Explanation:
Answer:
The differences between the Florida's weasel and in Wyoming's is that I can see that in Wyoming it has a lot of snow so Wyoming's weasel fur is more thicker than Florida's weasel.
Explanation:
Overmore, in Florida's weasel the weasel's fur is much more less then Wyoming's weasel's fur. Subsequently, their fur color is very different. In Wyoming's weasel fur, it's white fur help them blend in the snow. In Florida's weasel fur, it's brown and help blend in the grass(soil).
One way to identify the type of radioactive decay produced in a reaction is to pass the emission through an electric field Describe the type of radioactive emission produced from the decay of uranium- 238 to thorium-234 and its reaction to the electric field
A) Radioactive gamma decay is produced by the reaction. This neutral electromagnetic radiation are not attracted to the electric field
B) Beta particles are released during the radioactive decay. These negative particles are attracted to the positive plate in the electric field.
C) During the radioactive decay, alpha particles are released. These positive particles are attracted to the negative plate in the electric field.
D) Both types of radioactive emissions, particles and electromagnetic radiation are produced during this decay. None of these are attracted to the electric field
Decay of Uranium-238 produces gamma radiaton whereas decay of thorium-234 releases beta radiation.
What type of radiation is produced?In the decay of U-238, two gamma rays of different energies are emitted in addition to the alpha particle while on the other hand, in the decay of thorium-234 , beta rays are emitted.
So we can conclude that decay of Uranium-238 produces gamma radiaton whereas decay of thorium-234 releases beta radiation.
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Answer:
Yes its
C. During the radioactive decay, alpha particles are released. These positive particles are attracted to the negative plate in the electric field.
Explanation:
Just got it right on USATP
Which statement below is true?
The mass of each planet is different, so they each orbit their own moons.
The mass all the planets together is greater than the mass of the sun.
The mass of all planets is the same, so they all orbit the Sun.
The mass of each planet is less than that of the Sun, so they all orbit the Sun.
Answer:The mass of each planet is less than that of the Sun, so they all orbit the Sun.
Explanation:
You are asked to make 500 mL of a 0. 250 M sodium chloride (NaCl) solution.
a. How many moles of NaCl would you need?
b. How many grams of NaCl would you need? (gfm = 58 g/mol)
Answer:
a. .125 mol b. 7.25g
Explanation:
a. To get the moles multiply the volume by the molarity.
.5L*.25M=.125mol NaCl
b. The molar mass is provided so multiply the moles by the molar mass to get the amount of grams of nacl.
.125mol*58molar mass=7.25g nacl to make the solution
What is important fraction of paraffin wax and asphalt? a. Fuel oil b. Diesel oil c. Kerosene oil d. Residue oil
The fraction of parafin wax and asaphalt is diesel oil
What is fractional distillation?Fractional distillation is the process by which crude oil are separated in to different form base on their molecular weight and boiling points by petroleum refineries .
parafin wax and asaphalt is use for making roads and candles.
Therefore, The fraction of parafin wax and asaphalt is diesel oil.
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Please answer questions 7-13 for alpha and beta decay. I need help!!!!!!!
Which of the following represents enthalpy on this graph?
Question 1 options:
1
2
3
4
exothermic reaction is reactants accomphen by evolution of heat
Which type of intermolecular forces is present in all substances regardless of polarity?.
Answer:
Dispersion forces are present between all molecules, whether they are polar or nonpolar. Larger and heavier atoms and molecules exhibit stronger dispersion forces than smaller and lighter ones.
Explanation:
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Answer the question PLS 100 points!!!
Now
1.36atm1.36(760)1033.6mm HgDone!
We know
[tex]\boxed{\sf 1atm=760mmHg}[/tex]
So convert now
1.36atm1.36×760mmHg136/100(760)mmHg1033.6mm HgGive two physical properties of ionic compounds
Explanation:
Hope it helps you!!A scientist obtains a flask of oxygen gas with a temperature of 314 K and a volume of
exactly 100 liters. If the flask contains 88 moles of gas, what is the pressure?
Answer:
22.11 atm
Explanation:
Use the ideal gas law PV=nRT
P(100)=88(.08)(314)
100P=2210.56
P=22.11 atm
A hydrocarbon with this formula C4H6 is what?
a. indeterminate
b. s unstable
c. is somewhat reactive
d. is chemically inert
Let's check
C_4H_6[tex]\\ \rm\Rrightarrow C_4H_{2(4)-2}[/tex]
[tex]\\ \rm\Rrightarrow C_4H_{8-2}[/tex]
[tex]\\ \rm\Rrightarrow C_4H_6[/tex]
It has tripple bondIt follows rule C_nH_2n-2Belongs to alkyne groupSo
It's unstableOption B
Consider the southeast coast of north america and the northwest coast of africa. According to the current theory of plate tectonics, these two regions were once very close together. However, the coasts do not quite fit together like puzzle pieces, as one might expect. This can be explained by the fact that the southeast edge of north america's ________ actually does fit nicely with the northwest edge of africa's __________ even if the coasts do not
Answer:
Both are continental shelf's.
Explanation:
A continental shelf is the shallow underwater extension of land surrounding a continent. It makes up the edge of a landmass, even though it is under water. At some points in the Earth's past, many underwater continental shelves were once a part of dry land.
Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical equation: ()zn ()hcl → ()zncl2 ()h2
Based on the chemical equation, to balance the equation we use 2 as a coefficients of HCl on left hand side of reaction.
What is balanced equation?Balanced chemical equations are those equation in which each entities are present in same amount on left side as well as on the right side of the chemical reaction.
Given chemical reaction is:
Zn + HCl → ZnCl₂ + H₂
Above reaction is not balanced equation as number of chlorine and hydrogen atoms are not same, so balanced equation will be:
Zn + 2HCl → ZnCl₂ + H₂
Hence we add 2 as a coefficient of HCl to balance the equation.
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Answer:
1 2 1 1
Explanation:
im yes hi okay no bye
Isaac is baking a cake and needs to add flour weighing 5.85 oz to the mixture. if there are 28.3495 g in one ounce, how many grams of flour does he need to add? a. 4.85 g b. 20.64 g c. 158.69 g d. 165.84 g
The quantity of floor needed by the Isaac for making the cake will be equal to 165.844575 gram
What is a Unit Conversion system?
Unit conversion is a multi-step process that involves multiplication or division by a numerical factor, selection of the correct number of significant digits, and rounding.
Given that
1 oz =28.3495 gram
Therefore 5.85 oz will give x gram
X gram is what we are looking for
X gram= 5.85 oz× 28.3495g/1
Xg= 165.844575 gram
Approximately 165.8446 gram
Thus, Isaac needs to add 165.8446g of flour to the mixture to make 5.85 oz
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What is the equilibrium expression for 2NO+Br2⇌2NOBr?
A.) [NO]2[Br2]/[NOBr]2
B.) [NOBr]2/[NO2][Br]2
C.) [NO2][Br]2/[NOBr2]
D.) [NOBr]2/[NO]2[Br2]
Explanation:
D mole is a power. .......
[NOBr]2/[NO]2[Br2] is the equilibrium expression for 2NO+Br2⇌2NOBr. Therefore, the correct option is option D.
What is equilibrium?When the observable qualities, such as colour, pressure, temperature, concentration, etc. do not vary, the process is said to be in equilibrium. As "balance" is the definition of the word "equilibrium," it follows because a chemical reaction reflects a balance among the substances and outcomes involved in the reaction.
In some physical processes, such as the melting of ice at 0°C, where both the two substances are present at equilibrium, the equilibrium state can also be observed. Physical equilibrium refers to the equilibrium that results from physical processes like the melting of solids. [NOBr]2/[NO]2[Br2] is the equilibrium expression for 2NO+Br2⇌2NOBr.
Therefore, the correct option is option D.
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Which represents the correct equilibrium constant expression for the reaction below? upper c u (s) plus 2 upper a g superscript plus (a q) double-headed arrow upper c u superscript 2 plus (a q) plus 2 upper a g (s). k e q equals startfraction startbracket upper c u endbracket startbracket upper a g superscript plus endbracket superscript 2 over startbracket upper c us superscript 2 plus endbracket startbracket upper a g endbracket superscript 2 endfraction. k e q equals startfraction startbracket upper c u superscript 2 plus endbracket startbracket upper a g endbracket superscript 2 over startbracket upper c u endbracket startbracket upper a g superscript plus endbracket superscript 2 endfraction. k e q equals startfraction startbracket upper a g superscript plus endbracket superscript 2 over startbracket upper c u superscript 2 plus endbracket endfraction. k e q equals startfraction startbracket upper c u superscript 2 plus endbracket over startbracket upper a g superscript plus endbracket superscript 2 endfraction.
The correct equilibrium constant expression for the given chemical reaction is Keq = [Cu²⁺] / [Ag⁺]².
What is equilibrium constant?Equilibrium constant of any reaction at the equilibrium state will be define as the ratio of the concentration of products to the concentration of the reactants.
Given chemical reaction is:
Cu(s) + 2Ag⁺(aq) ⇄ Cu²⁺(aq) + 2Ag(s)
Equilibrium constant for the above reaction will be written as:
Keq = [Cu²⁺][Ag]² / [Cu][Ag⁺]²
But in the above reaction at the product side silver is present in pure solid form and at the reactant side copper is present in pure solid form and concentration of these elements equals to one in equilibrium state, so that equation becomes:
Keq = [Cu²⁺] / [Ag⁺]²
Hence equilibrium expression for given reaction is Keq = [Cu²⁺] / [Ag⁺]².
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Answer: D
Keq = [Cu²⁺] / [Ag⁺]²
Which of the following lists describes characteristics of a base? (3 points) Bitter taste, high pH, and caustic Bitter taste, low pH, and slippery Sour taste, high pH, and dissolves metals
Bitter taste, high pH, and caustic Bitter are the characteristics of base.
What are the characteristics of base?Bases have bitter taste, soapy feel, turn red litmus paper blue. Bases are substances that contain metal oxides or hydroxides. Its pH is higher than 7 up to 14.
So we can conclude that bitter taste, high pH, and caustic Bitter are the characteristics of base.
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Answer:
Bitter taste, high pH, and caustic
Explanation:
I took the test :)
Which food provides more energy for your body, tortilla chips or marshmallows? How do we determine how good provides energy to our body? Explain
Waves that move through matter are called waves. Waves that move through space are called waves
Answer
Electromagnetic waves.
Explanation: Waves that Move through matter only are called Mechanical waves. Waves that move through space only are called electromagnetic waves.
What happens to the electrons of a reducing agent during a reaction?
Electrons are doubled
Electrons are lost
Electrons are gained
Electrons are held
Answer:
A I DID THIS BEFORE
Explanation:
Complete the following calculations regarding acid/base titrations
If 25.5 mL of a 0.1 M base solution was required to ti trate 60 mal of an unknown acid solution,what is the molarity of the acid solution?
Based on the information provided and the assumption that the mole ratio of the acid to the base is 1:1, the molarity of the acid would be 0.0425 M
Acid/base TitrationUsing the equation:
CaVa = CbVb
This is based on the assumption that the stoichiometric mole ratio of the acid to the base is 1:1.
Ca = CbVb/Va
0.1 x 25.5/60 = 0.0425 M
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True or false, Atoms with 5 to 8 electrons want to "donate" or get rid of them.
Thank you!
What is the temperature, in kelvin, of 4.15 moles of a gas at a pressure of 7.30 atmospheres in a 21.7 liter container?
P
V
=
n
R
T
R = 0.0821
a
t
m
⋅
L
m
o
l
⋅
K
Answer:
461.91 Kelvin
Explanation:
P = 7.30 atm
V = 21.7 liters
n = 4.15 moles
R = 0.0821 atm
T = ?
PV = nRT
(7.30) (21.7) = (4.15) (0.0821) (T)
158.41 = 0.34 (T)
T = 465.91 Kelvin
What is the boiling point of milk in degrees celsius?.
Answer:
Milk's boiling temperature is nearly identical to that of water, 100 degrees Celsius (212 degrees Fahrenheit)
Explanation:
if 66.38 g of potassium chloride reacts with fluorine and produces potassium fluoride and chlorine how many moles of chlorine can you get?
Taking into account the reaction stoichiometry, f 66.38 g of potassium chloride reacts with fluorine and produces potassium fluoride and chlorine, 0.4452 moles of chlorine is produced.
Reaction stoichiometryIn first place, the balanced reaction is:
2 KCl + F₂ → 2 KF + Cl₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
KCl: 2 moles F₂: 1 moleKF: 2 moles Cl₂: 1 moleThe molar mass of the compounds is:
KCl: 74.55 g/mole F₂: 38 g/moleKF: 58.1 g/moleCl₂: 70.9 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
KCl: 2 moles ×74.55 g/mole= 149.1 grams F₂: 1 mole ×38 g/mole= 38 gramsKF: 2 moles ×58.1 g/mole= 116.2 gramsCl₂: 1 mole ×70.9 g/mole= 70.9 gramsMoles of Cl₂ formedThe following rule of three can be applied: if by reaction stoichiometry 149.1 grams of KCl form 1 mole of Cl₂, 66.38 grams of KCl form how many moles of Cl₂?
[tex]amount of moles of Cl_{2} =\frac{66.38 grams of KClx1 mole of Cl_{2}}{149.1 grams of KCl}[/tex]
amount of moles of Cl₂= 0.4452 moles
Then, if 66.38 g of potassium chloride reacts with fluorine and produces potassium fluoride and chlorine, 0.4452 moles of chlorine is produced.
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Explain in terms of atomic structure why barium has lower first ionization energy than magnesium
Answer:
Barium is lower in group 2 than magnesium, so number of shells increase. The valence electron is further from the nucleus making it easier to lose electrons.
Explanation:
Barium has more electrons shells than calcium, so the nuclear shielding is stronger, and the outmost electrons are further away from the nucleus. This results in a weaker attractive force between the electron and the nucleus, so a smaller energy is required to remove it.
Answer:
Barium has a greater radius than magnesium
Explanation:
Barium and magnesium are two elements which belong to the same group, group 2A. This means that the two elements have two valence electrons in their outer shell.
The difference is, however, since barium
is lower in group than magnesium, it has
more electron shells than magnesium and,
therefore, its radlus is greater. The attraction
force between the nucleus and the valence
electrons in barium is lower as a result, as force
is inversely proportional to distance. Hence, a
lower amount of energy is required to remove
the valence electrons from barium.
Explanation:
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