Answer: they are different units of concentration
Explanation:
9. Let's say, you need to make 2.00 L of 0.05 M copper (II) nitrate solution. How many grams of
copper (II) nitrate will you require?
Answer:
18.76 g of copper II nitrate
Explanation:
Now recall that we must use the formula;
n= CV
Where;
n= number of moles of copper II nitrate solid
C= concentration of copper II nitrate solution
V= volume of copper II nitrate solution
Note that;
n= m/M
Where;
m= mass of solid copper II nitrate
M= molar mass of copper II nitrate
Thus;
m/M= CV
C= 0.05 M
V= 2.00 L
M= 187.56 g/mol
m= the unknown
Substituting values;
m/ 187.56 g/mol = 0.05 M × 2.00 L
m= 0.05 M × 2.00 L × 187.56 g/mol
m= 18.76 g of copper II nitrate
Therefore, 18.76 g of copper II nitrate is required to make 0.05 M solution of copper II nitrate in 2.00 L volume.
Which of the following sources is considered to be most reliable for scientific
information?
A. Legislation regarding environmental issues
B. Article in an academic journal
C. Interpretation of a journal article
D. Political commentary on research
Answer:
The answer is D
Explanation:
Pls mark as brainliest
solve the following (3x10^9)(4x10^5)/(6x10^-3)
Answer"
[tex]2(10^{17})[/tex]
Explanation:
You can simply just plug this into your calc and you should get the answer. Alternatively, when you multiply exponents, you add them, so you know you answer would be something times [tex]10^{17}[/tex]. After finding that out, you multiply 3 by 4 (which is 12), and divide by 6, which gives you 2. Multiply the 2 together and you get your answer.
Phosphorus has three electrons in its 3p sublevel and sulfur has four.
Phosphorus should have the lower ionization energy but it does not,
sulfur does. What does this provide evidence for?
A. Aufbau's principle
B. Conservation of energy
C. Hund' rule
D. None of these
Reset Selection
Answer:
The correct answer is C. Hund's rule.
Hund's rule states that for atoms in their ground state, electrons will occupy orbitals of the same energy level one by one before pairing up. This means that when filling the 3p sublevel, phosphorus should have one electron in each of the three 3p orbitals before any of them start pairing up.
However, in reality, sulfur has a lower ionization energy than phosphorus. This means that it is easier to remove an electron from sulfur than from phosphorus. This contradicts the expectation based on Hund's rule.
Therefore, the fact that sulfur has a lower ionization energy than phosphorus provides evidence that Hund's rule is not the only factor governing the electron configuration and ionization energies of elements. Other factors, such as electron-electron repulsion and the stability of half-filled or filled subshells, also play a role.
What is beta radiation?
Answer:
emission at a high speed or energy which often forms electrons
41. Which pair of compounds could combine to produce an ester?
I. CH3- CH2 - CH2 - CH3
II. CH3- CH2 - CH2-CH2-OH
III. CH3- CH2 - CH2-COOH
IV. CH3- CH2- CH2- COH
a. I and II
b. II and III
c. II and IV
d. III and IV
Answer: b. ii and iii
Explanation:
The ester, Butyl Butanoate is formed when Butanol reacts with Butanoic acid
as seen below;
CH3-CH2-CH2-CH2-OH + CH3-CH2-CH2-COOH ---->
Butanol Butanoic acid
CH3-CH2-CH2-COOCH2-CH2-CH2-CH3 + H2O
Butyl Butanoate Water
What are the units of molality? A. mol/kg B. g/mol C. mol/L D. kg/mol
Answer: A.mol/kg
The SI (international system) unit for molality is mol / kg, or solute moles per kg of peptides. A solution with a molality of 1 mol / kg is often described as "1 molal" or "1 m".
Answer:
mol/kg
Explanation:
hope it helps .
is rainbow a gay color?
Answer:
yes very much
Explanation:
Answer:no Not really its Neutral
Explanation:
What is a base?
A. A substance that contributes chloride ions to the solution
B. A substance that increases the concentration of oxygen in
solution
C. A substance that increases the concentration of OH ions in
solution
D
O D. A substance that increases the concentration of H+ ions when
dissolved
de semana
Answer:
The subsrance that increases OH ion concentration.
Explanation:
Calculate the molar mass of carbon tetrafluoride (CF4) in grams per mole, rounding to proper significant figures, if mc= 12.01 u and mF = 19.00 u.
Answer:
molar mass of carbon tetrafluoride (CF4) is
(12.01 × 1 ) + ( 4 × 19.00)
= 12.01 + 76
= 88.01u
= 88u
Hope this helps
What kind of solution would have a Ky value that is much less than 12
A. A strongly basic solution
B. A weakly acidic solution
C. A strongly acidic solution
D. A weakly basic solution
Answer:
The answer is option D.
A weakly basic solution
Hope this helps.
Answer:
Explanation: Apex a weakly acidic solution
Which layer of the sun is responsible for producing the light shown in the picture above?
Chromosphere
Convective Zone
Photosphere
Radiative Zone
Answer:
The photosphere
Explanation:
The photosphere comes from the outermost layer of the sun
Pls give me brainliest
Answer:
nice i think he right
Explanation:
What volume of air at 25°C and 1.00 atm can he stored in a 10.0 L high-pressure air tank if compressed to 25°C and 175 atm? please show your work!
Answer:
0.057 L
Explanation:
Data obtained from the question include:
Initial temperature (T1) = 25°C
Initial pressure (P1) = 1 atm
Initial volume (V1) = 10 L
Final temperature (T2) = 25°C
Final pressure = 175 atm
Final volume =.?
From the data obtained from the question, we can see that the temperature is constant. Therefore, we shall apply the Boyle's law equation to determine the new volume of air. This is illustrated below:
P1V1 = P2V2
1 x 10 = 175 x V2
Divide both side by 175
V2 = 10/175
V2 = 0.057 L
Therefore, the volume of air which can be stored when the tank is compressed is 0.057 L
a sample of 30 11th graders were asked to select a favorite pattern out of 6 choices. The following display shows what their favorite color patterns where. The counts have been recorded in the accompanying table according to pattern and the number of students who selected that pattern. What is the missing value in the table? A.11 B.9 C.8 D.10
Answer:
B.9
Explanation:
Students: 30
Total counts: 21 + ?
3+6+6+4+2 = 21
30-21 = 9
The missing value in the table is 9
What type of bonding around a central atom would result in a trigonal planar
molecule?
Answer: Three groups bound to it with no lone pairs
i think...
The diagram below shows the different phase transitions that occur in matter. Three bars are shown labeled Solid, Liquid, and Gas. They are connected by arrows labeled 1 to 6. Arrow 1 points from liquid to gas; arrow 2 from solid to liquid, arrow 3 from solid to gas, arrow 4 from gas to liquid, arrow 5 from liquid to solid, and arrow 6 from gas to solid. Which statement best describes the process that arrow 1 represents? Molecules are speeding up as boiling occurs. Molecules are slowing to a stop while freezing. Molecules are slowing down during condensation. Molecules are vibrating in stationary positions.
Answer:
Molecules are speeding up as boiling occurs.
Explanation:
We have three states of matter;solid liquid and gas. Substances are found in these different states of matter according to the degree of energy and velocity of its particles. Highly energetic particles moving at high velocities are found in the gaseous state. Less energetic particles moving at lesser velocities due to intermolecular forces are found in the liquid state while particles with the least degree of freedom are found in the solid state. Solid particles do not translate but can vibrate or rotate about a fixed position.
When a liquid boils, particles at the surface of the liquid acquire sufficient energy and escape the surface of the liquid. This is because, as energy is supplied in the form of heat during boiling, molecules acquire sufficient energy to speed up their molecular motion and escape the liquid surface as vapour.
Molecules are speeding up as boiling occurs is the statement that best describes the process of arrow 1.
Evaporation is a physical process in which matter transforms from a liquid state to a gaseous state. Generally this process occurs when matter is exposed to high amounts of energy.
When a material is exposed to energy, its particles begin to move and speed up until they break their bonds and are released in the form of gas.
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Perform the following
mathematical operation, and
report the answer to the
appropriate number of
significant figures.
0.00325136 - 1.76527 =
Answer:
-1.76201864
Explanation:
0.00325136 - 1.76527 = 1.76201864
The concept of significant figures are mainly used by scientist and engineer to know the significance of digits in a measurement. Therefore, -1.76201 is the value on applying mathematical operation.
What is significant figures?Significant figures are the figures that indicate the degree of accuracy of a value. It tells about the precision of a value. It gives an idea about the digits that are necessary to indicate the experimental value.
Rules for counting significant figures are:
Number between 1 to 9 is always significant
Zeroes after a number has got no significance
Zeroes before a number has got no significance
Zeroes between number has got significance
0.00325136 - 1.76527
= -1.76201
Therefore, -1.76201 is the value on applying mathematical operation.
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Which of the following inter-particle forces has the lowest potential energy?
A. ion-ion interaction
b. hydrogen bonding
c. dipole-dipole interaction
d. ion-dipole moment
Answer:
b. hydrogen bonding.
Explanation:
Hope it helps.
1. Convert 0.00006125 to scientific notation
Answer:
6.125 × 10^-5
Explanation:
You have to move the decimal place 5 times to the right. Remember in scientific notation the first number, (the number that comes before the 10) has to be between 1.0 and 9.99...
Use the chemical equation to find the answers. BaSO4 + H2SO4 → Ba(HSO4)2 Identify how many oxygen atoms are in the product. Identify how many oxygen atoms are in the reactant.
Answer:
Since the equation is balanced, So it have same number of oxygen in the reactants and well as product.
Oxygen in product = 8
Oxygen in reactant = 8
Answer:
Explanation:
i got prove thoooooo
If you want to lift a 30-kg box to a height of 1 m, how much work will it take?
A. 300 J
B. 147 J
C. 294 J
D. 30 J
If we want to lift a 30 kg box to a height of 1 m Ans is 294 J
Explanation:
Ans is 249 J
How many grams of potassium chloride (KCl) can be dissolved in 68.0g of water at 40°C? Please help.
Answer:
The problem provides you with the solubility of potassium chloride,
KCl
, in water at
20
∘
C
, which is said to be equal to
34 g / 100 g H
2
O
.
This means that at
20
∘
C
, a saturated solution of potassium chloride will contain
34 g
of dissolved salt for every
100 g
of water.
As you know, a saturated solution is a solution that holds the maximum amount of dissolved salt. Adding more solid to a saturated solution will cause the solid to remain undissolved.
In your case, you can create a saturated solution of potassium chloride by dissolving
34 g
of salt in
100 g
of water at
20
∘
C
.
Now, your goal here is to figure out how much potassium chloride can be dissolved in
300 g
of water at this temperature. To do that, use the given solubility as a conversion factor to take you from grams of salt to grams of water
300
g H
2
O
⋅
34 g KCl
100
g H
2
O
=
102 g KCl
You should round this off to one sig fig, since that is how many sig figs you have for the mass of water
∣
∣
∣
∣
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
a
a
mass of KCl
=
100 g
a
a
∣
∣
−−−−−−−−−−−−−−−−−−−−−−−
Explanation:
Based on the solubility curve, 27.2 g of KCl will dissolve in 68.0 g of water.
What is a solubility curve?A solubility curve is a curve which plots the amount of solute that can dissolve in a given volume of solvent against changes in temperature.
The solubility of a gives the amount that of solute that can dissolve in a given volume of solvent at a given temperature.
Based on the solubility curve above, 40 grams of potassium chloride (KCl) can be dissolved in 100.0g of water at 40°C.
Solubility of KCl at 40 °C = 0.4 g/g of water
Mass of KCl that can dissolve in 68.0 g of water = 0.4 × 68 = 27.2 g
Therefore, 27.2 g of KCl will dissolve in 68.0 g of water.
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The empirical formula is:
A. the actual number of atoms of each element in a molecule.
B. representation of a compound that shows how its atoms are arranged.
C. All of these
D. the relative number of atoms of each element, using the lowest whole ratio.
Reset Selection
Answer:
option c the relative number of atoms of each element using the lowest ratio because empirical formula gives the simplest-whole number ration of each element
e.g. the empirical formula of benzeneC6H6 in CH
Explanation:
I HOPE IT WILL HELP YOU
What is the change in enthalpy of the first reaction below, given the enthalpies
of the other two reactions?
2NO(g) + O2(g) + 2NO2(g)
N,(8)+ O2(g) → NO(g)
N,(8)+O2(g) + NO2(g)
AH = 90 kJ/mol
AH° = 34 kJ/mol
A. 56 kJ
B. -112 kJ
C. 124 kJ
D. -248 kJ
Answer:
The correct option is;
B. -112 kJ
Explanation:
The parameters given are;
N (g) + O₂ (g) → NO (g) ΔH = 90 kJ/mol
N (g) + O₂ (g) → NO₂ (g) ΔH = 34 kJ/mol
The required chemical reaction is given as follows;
2NO (g) + O₂ (g) → 2NO₂ (g)
Therefore, the heat of formation of 2 moles of NO = 2 × 90 = 180 kJ
The heat of formation of 2 moles of NO₂ = 2 × 34 = 68 kJ
Hence, given that the heat of formation of O₂ at room temperature = 0 kJ/mol, we have;
Change in enthalpy of the chemical reaction = Heat of formation of the products - Heat of formation of the reactants
Change in enthalpy of the chemical reaction = 68 kJ - 180 kJ = -112 kJ
Change in enthalpy of the chemical reaction = -112 kJ.
Answer:
-112
Explanation:
got it right on test
2 Pc
What energy transfer is occurring when you make a call on a phone?
A. electrical to chemical
B. heat to sound
C. electrical to sound
O
OD. chemical to light
Reset Selection
Answer:
electrical to sound
Explanation:
The total energy of a system remains constant always. In case of a phone, the battery of phone has chemical items. The chemical energy of the battery gets converted to the electrical energy into the phone. As a result, the electrical energy gets converted to sound energy.
Hence, the correct option is (C) "electrical to sound energy".
Why does reducing solute particle size increase the speed at which the solute dissolves in water? A. It exposes more of the solute to the water molecules. B. It makes the temperature of the water significantly higher. C. It raises the pressure of the water molecules on the solute. D. It makes the water molecules move around faster.
Answer:A
Explanation:For a given amount of solute, smaller particles have greater surface area. With greater surface area, there can be more contact between particles of solute and solvent.
Answer:
A. It exposes more of the solute to the water molecules.
Explanation:
What is an endothermic reaction?
O A. A reaction that produces heat
O B. A reaction that uses radiation waves
C. A reaction that absorbs heat
O D. A reaction that contains enthalpy
Answer:
C. A reaction that absorbs heat
Explanation:
I do not know Latin, but roughly speaking 'Endo' means inside, and 'thermic' means heat.
There are several types of chemical reactions, two of the important reactions are endothermic and exothermic. An endothermic reaction absorbs heat. The correct option is C.
What is endothermic reaction?The chemical reaction which proceed with the absorption of heat energy is defined as the endothermic reaction. In an endothermic reaction, the system gains heat and hence the enthalpy change ΔH will be positive.
In endothermic reaction, because of the absorption of heat, the enthalpy of the products will be more than that of the reactants. An example of endothermic reaction is shown as:
N₂ (g) + O₂ (g) → 2NO (g) ΔH = 180.5 kJ
So in endothermic reactions, the reactants absorb heat energy from the surroundings to produce the products. These reactions reduce the temperature of the surrounding area and thereby creates a cooling effect.
Thus the correct option is C.
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Once an action plan is in place, it should not be changed.
Please select the best answer from the choices provided.
ОТ
OF
Answer:
F = False
Explanation:
An action plan is a plan that an individual or a firm creates, that contains their objectives, aims, strategies , which they require to achieve their specific goals.
An action plan is very detailed, streamlined and straight to the point. It contains a series or a number of steps or tasks that an individual must embark on in other to achieve their end goal.
WHEN AN ACTION PLAN AS BEEN PUT IN PLACE OR SET IN MOTION, IT CAN BE CHANGED OR ALTERED. This is because the aim of a action plan is to achieve the end goal of an individual or a firm. As long as the changes made in the action plan does not hinder the achievement of those goals then the action plan can be changed.
Some of the very common reasons why action plans are changed or modified includes:
a) To make the action plan more flexible.
b) To track and monitor your progress in achieving your end goal. If there is a delay, you can easily track it out on your action plan and modify it.
In other to create an action plan, it is very important that the goals of such that individual or firm is very well defined and clear from the beginning. Action plans must always be monitored, and updated regularly.
Answer:
F, false
Explanation:
i took the quiz on edge
5. Which type of substances do you separate into lons when writing the complete lonic equation?
Answer:
As a general rule, soluble ionic compounds, strong acids, and strong bases should be written as dissociated ions in the complete ionic equation. Insoluble salts and weak acids are written using the neutral molecular formula since they only dissociate to a very small extent in water.
Explanation:
The definition of a limiting reactant can be summarized as:
a the reactant that is used up
b the greater amount produced
c the reactant that is not fully used
d the smaller amount produced
Answer:
Explanation:
A limiting reactant in a chemical reaction is one which puts limits on amount of product produced out of the reaction. The process of chemical reaction is stopped when the limiting reactant is fully used up.
Example:
Suppose you have
5 gram of oxygen and 10 gram of hydrogen to make any chemical product say y
since
amount of oxygen is only 5 gram thus, when all of 5 gram of oxygen will be used up then no further reaction will take place even though amount of hydrogen is present to react.
Thus, we can say that
oxygen is limiting the production of product y.
oxygen is fully used until the reaction stops.
Thus, in this case oxygen is limiting reactant.
Based on above discussion
the correct option for this problem is
a the reactant that is used up