Explanation:
Unsaturated solution: A solution with less solute that completely dissolves without leaving any remaining substance
Saturated solution: A solution with solute that dissolves until it can't dissolve anymore, leaving some of the remaining substance left.
Supersaturated solution: A solution that has more remaining substance left than a saturated solution and tends to crystallize more than a saturated solution.
A cleaning solution has a hydroxide ion concentration of 2.5 x 104 mol/L. Which of the following
statements are correct?
a) The solution has a pH of 3.6
b) The solution is basic.
c) The solution has a pH of 10.4
d) The solution is acidic.
O a and b
Ob and d
4
Original text
c and b
Contribute a bett
Od and c
A cleaning solution with an OH⁻ concentration of 2.5 × 10⁻⁴ mol/L, has a pH of 10.4 and is basic (options b and c).
How can we determine the acidity or basicity of a solution?If pH < 7, the solution is acid.If pH = 7, the solution is neutral.If pH > 7, the solution is basic.Step 1. Calculate the pOH of the solution.The hydroxide ion concentration is 2.5 × 10⁻⁴ mol/L.
pOH = -log [OH⁻] = log (2.5 × 10⁻⁴) = 3.6
Step 2. Calculate the pH of the solution.We will use the following expression.
pH + pOH = 14
pH = 14 - pOH = 14 - 3.6 = 10.4
Since pH > 7, the solution is basic.
A cleaning solution with an OH⁻ concentration of 2.5 × 10⁻⁴ mol/L, has a pH of 10.4 and is basic (options b and c).
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Calculate the mass of NaOH required to make 0.40 L of a 0.50 M solution
Answer:
8 gm
Explanation:
NaOH molar weight = 22.989 + 15.999 + 1.008 = 39.996 gm
.5 M would contain 1/2 of this per liter = 19.998 gm
now you only want 400/1000 of a liter = 7.9992 gm ~ 8gm
What’s a bond when it come to chemical structure
Answer:An electron positioned between two nuclei will be attracted to both of them, and the nuclei will be attracted toward electrons in this position. This attraction constitutes the chemical bond.
Explanation:good luck
In the reaction 3 O2 --> 2 O3, how many grams of O3 will be formed from the reaction of 100 g of O2?
a. 67 g
b. 133 g
c. 50 g
d. 100 g
Answer:
a. 67
Explanation:
3mol O2 = 2mol O3
1mol O2 = 2/3 mol O3
100g = 2/3 × 100 = 67
What are the substance that causes environment effect?
Answer:
Common environmental chemical pollutants include pesticides and herbicides, volatile organics (VOCs) such as benzene, toluene; and chloroform, heavy metals such as lead, mercury, and arsenic; air contaminants such as carbon monoxide, ozone, particulate matter (PM), and second hand smoke; and persistent organic pollutants, such as the dioxins, PCBs, and DDT. Environmental chemicals can cause a broad spectrum of effects, which depend not only on route of exposure and dose, but on the susceptibility of the recipient of the pollution
What volume of it must be diluted with water to obtain 500cm 3 of 0.01 molar solution. If the stock solution is 1.0 M?
Answer:
5 cc
Explanation:
.01 M * 500/1000 = .005 M needed
1.0 M * x .005 M
x =.005 liter 5 cc
5cc of 1M dilute to 500 cc
The concentration or volume of a solution can be determined from the molarity and volume of the second solution. The volume the solution of 1 M to prepare 500cm³ of 0.01 molar solution is 5 molar.
What is molarity?Molarity of a solution is its concentration in terms of number of moles per unit volume. Molarity depends on the temperature and amount of solute and solvent as well.
If a solution have M1 molarity and V1 volume and a second solution have M2 volume and V2 volume then the relation between these quantities is written as follows:
M1V1 = M2V2
Given that solution to be prepared has the concentration of 0.01 M and volume of 500 cm³. Then the volume of stock solution with 1.0 M concentration is calculated as follows:
500cm³ × 0.01 M = 1.0 M × V2
V2 = (500cm3 × 0.01 M )/1.0 M
= 5 cm³
Hence, the volume of stock solution is 5 cm³ required for the preparation of 500cm³ of 0.01 molar solution.
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Motivation that is physical and can be touched like a trophy or a medal is:
A. Tangible
B. Intrinsic
C. Intangible
D. Extrinsic
Answer:
Tangible
Explanation:
Tangible alone means it is "perceptible by touch," meaning you physically observe the object with your sense of touch.
Having tangible motivation is like working for money or a trophy.
In an addition reaction to an alkene, the pie bond plays the role of ?
Answer:
The pi bond is electron rich and takes the role of the nucleophile seeking out an electrophile with its full or partial positive charge. Using a general molecule X-Y as the electrophile reacting with ethene, the atoms 'X' and 'Y' are added to the carbon chain across the vinylic carbons as shown below.
Explanation:
hope this helps
How many grams of KBr are dissolved in 92.7 mL of a 0.955 M solution? Show your work.
Answer:
10.5g of KBr
Explanation:
molarity = moles of solute / litres of solution
we are given the volume of the solution in milliliters but the formula uses litres so we have to convert
to convert to liters we divide the number of milliliters by 1000 ( because 1 liter has 1000 milliliters. )
so liters of solution = 92.7/1000 = 0.0927 L
we can now plug in what we are given and solve for moles of solute
recall molarity = moles of solute / litres of solution
molarity = 0.955M and liters of solution = 0.0927L
so [tex]0.955M=\frac{moles.of.solute}{0.0927L}[/tex]
multiply both sides by 0.0927
we're left with moles of solute = 0.0885285 moles
Finally we must convert moles to grams
Molar mass of KBr = 39.0983 + 79.904 = g/mol
Using dimensional analysis we get [tex]\frac{0.0885285molKBr}{} *\frac{119.002g}{1molKBr}[/tex]
the mol KBr cancel out on both sides and we get [tex]0.0885285 *119.002g[/tex] which is equal to 10.5g (rounded)
So we can conclude that 10.5g of KBr is dissolved in 92.7mL of a 0.955M solution.
Which is NOT something that producers do?
Group of answer choices
consume other organisms for energy
photosynthesize
take energy from the sun and turn it into food energy
serve as food energy for many other organisms
ANSWER ASAP PLS!!!
Answer:
consume other organisms for energy
Answer:
consume other organisms for energy
Explanation: .....
Bonding with intermolecular forces:
1.) is C2H5CI a hydrogen bonding? yes or no?
2.) is C2H5CI dipole-dipole interactions? Yes or no?
3.) is C2H5CI a london dispersion forces? Yes or no?
Answer:
1. yes
2. yes
3. no
sorry if I am wrong but hope this helps
A sound wave is traveling at 6,420 m/s and has a frequency of 600 Hz.
What is the wavelength?
10.7 mExplanation:The wavelength of a wave can be found by using the formulawherec is the speed of the wavef is the frequencyFrom the questionc = 6420 m/sf = 600 HzWe haveWe have the final answer as10.7 mHope this helps you
If a space rover has a mass of 3900 kg on earth then what is its mass when it lands on mars?
Answer:
390, the force of gravity is 10 N on Earth, so you would divide 3900 by 10
Explanation:
The mass of the space rover will remain constant but its weight will change.
What is Mass?Mass defines the amount of matter present in any object or body. It is also a measure of body's inertia.
Given is a space rover that has a mass of 3900 kg on earth.
Mass of an object is the sum of the masses of all the individual masses of its constituents. Mass of an object always remains constant. Anywhere in the universe, the mass of body cannot change. Although, if we talk about the mass of body as its velocity approaches the speed of light, the mass of body changes according to the general relativity but that is not the case here. However, weight of the object say space rover will be different as it depends upon the acceleration due to gravity (g) on mars. At mars -
Acceleration due to gravity [g] = 3.72 m/s²
Mass of space rover [M] = 3900 Kg [remain same]
Weight of space rover [W] = Mg = 3900 x 3.72 = 14508 Kg
Therefore, the mass of the space rover will remain constant but its weight will change.
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How many moles are in 80.0g of sodium chloride (NaCl)
Answer:
1.37 mol NaCl
Explanation:
Hi!
For this one, you are given a mass (in grams) of NaCl, 80.0.
To convert this to moles, you have to do a mass-to-mole calculation, where you use the molar mass of NaCl.
Na's m.m. is 22.99 g/mol
Cl's m.m. is 35.45 g/mol
1(22.99 g/mol) + 1(35.45 g/mol) = 58.44 g/mol => here is the molar mass of NaCl.
Here's the setup for the conversion:
g(mol/g) - we are flipping g/mol to mol/g to get mol on top (since we are looking for the # of mol) and g on the bottom to cancel out the g unit.
80.0 g NaCl(1 mol NaCl/58.44 g NaCl) = 80.0 / 58.44 = 1.37 mol NaCl.
I hope this helped!
Which type of science is the study of living things and living systems?
A. Life science
B. Physical science
C. Earth science
D. Space science
what is the formula for carbon?
The structural formula of carbon is as shown below. Carbon is a nonmetallic and tetravalent compound that can accommodate 4 electrons to form a covalent bond. It has the capacity to establish bonds easily with other atoms and with other carbon atoms too, carbon is competent of establishing multiple stable covalent bonds with suitable multivalent atoms.
Chemical formula = [tex]C[/tex]
I need answers please
Answer:
It will release H+ in water.
Explanation:
Acid releases hydrogen ionsAlkaline is slippy such as soap, shampoo which is slippery contains alkaline.Alkaline dissociates to release OH- ions in water.how do you interpret this IR spectrum
First if you have a data sheet you would compare the four peaks that are denoted by a,b,c and d and see if the number in which the peak falls alligns with a bond type present in the moecule. IR spectroscopy is used quite alot in organc chemistry so using my data sheet I'd assume that;
Peak D, likely represents a C-O bond (found in wavenumer range 1000-1300)
Peak C, likely represents a C-H bending vibrations (with wavenumber range 1400-1500)
Peak B, is likely a C=C bond, (with wavenumber range of 1620-1680
Peak A, is likely a C=O bond, (with wavenumber range of 1680-1750)
From here you could predict some possible molecules that the IR spectrum alligns with ie any molecules that are composed of C-H, C-O, C=O and C=C bonds, like an ester with an unsaturated carbon chain.
Calculate the volume in mL of 0.589 M NaOH needed to neutralize 52.1 mL of 0.821 M HCl in a titration.
Answer:
72.6 mL
Explanation:
A quick way to solve this titration problem when you have a monoprotic acid is to use the Dilution equation, M1V1=M2V2.
.589(x)=.821(52.1)
X=72.6 mL
Explain why the chemical properties of Mg 24 12 and Mg 26 12 are the same
The diagram displays the concentration of products (blue) and reactants (red) over time for a chemical reaction.
Which statement is true?
Reactant concentration is always decreasing.
Product concentration is always increasing.
Reactant and product concentrations are never equal.
As time goes on, reactant and product concentrations become balanced.
Answer:
D. As time goes on, reactant and product concentration become balanced.
Explanation:
I believe this is correct.
Where is the friction that allows the skater to complete the move that is occurring in this image?
a girl ice skating
© Wildcow / iStock 2018
The movement of her skirt through the air
The movement of her body through the air
The point of contact between the skates and the ice
The point of contact between the skates and her foot
Answer:
The point of contact between the skates and the ice.
Explanation:
It's obvious because friction is the contact between two surfaces.
As a pilot is flying in level flight at 9,500 ft, the altimeter in the instrument panel is set to a pressure of 29.48 mm of Hg. As the aircraft travels along its route, the outside air temperature changes from 23.0°C to 9.0° C. To what pressure does the pilot need to reset the altimeter in order for the altimeter to indicate the aircraft's true altitude?
Answer:
from the ideal gas law, P2 /P1 = T2 /T1 for the same volume and quantity of gas. P2 = (758 mmHg) (45 +273 K) / (15 +273K) = 837 mmHg.
Explanation:
The measurement 0.41006 gram, rounded to four significant figures, is expressed as...
1) 0.4100 g
2) 0.410 g
3) 0.41 g
4) 0.4101 g
0.4100 g - Rounding to four significant figures retains trailing zeros after the decimal point when followed by a non-zero digit.
Option (1) is correct.
In scientific notation, significant figures are digits that carry meaningful information about the precision of a measurement. When rounding a number to four significant figures, we consider the digits up to the fourth digit from the left (including trailing zeros after the decimal point).
In the given measurement, 0.41006 gram, we start counting from the left:
The first significant figure is "4."
The second significant figure is "1."
The third significant figure is "0."
The fourth significant figure is "0."
The fifth digit "6" is beyond the fourth significant figure, so we ignore it when rounding.
Since the fourth significant figure is "0," and it's followed by a digit greater than or equal to 5 (in this case, "6"), we round up the last significant figure. Hence, the measurement rounded to four significant figures is 0.4100 grams (option 1).
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A piece of tin foil has a volume of 0.5345 mm3. If the piece measures 10.0 mm long and 1.25 cm wide, what is the thickness of the foil?
Answer:
Thickness of foil = 0.004mm
Explanation:
V= length x width x height (height can also be known as the thickness 't')
0.5345=10.0 x (1.25÷10) x t
t=0.5345/10.0 x 12.5
t=0.004276mm
t=0.004mm
HELP!
How many moles of a solute would 3 liters of a 2-molar solution contain?
The number of moles of a solute that 3 liters of a 2-molar solution would contain is 6 moles. Details about number of moles can be found below.
How to calculate number of moles?The number of moles of a substance can be calculated using the following formula:
Molarity = no of moles ÷ volume
According to this question, there are 3 liters of a 2-molar solution. The number of moles can be calculated as follows:
no of moles = 3L × 2M
no of moles = 6 moles
Therefore, the number of moles of a solute that 3 liters of a 2-molar solution would contain is 6 moles.
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Which choice has the least thermal energy
H. Nitrogen gas and hydrogen gas combine to produce ammonia gas (NH3).
What volume of hydrogen gas at 25°C and 735 mm is required for the
complete reaction of 10.0g of nitrogen?
Answer:
27.3 L
Explanation:
Reaction
N₂ (g) + 3H₂ (g) ⇒ 2NH₃ (g)This is the basic reaction at STPSolving
10 g N₂ x 1 mol NH₃/28 g N₂ x 3 mol H₂/1 mole N₂⇒ 1.07 mol H₂V = nRT/P [From Ideal Gas Equation]V = 1.07 x 62.36 x 298 K / 735V = 27.3 L27.3 L. N₂ (g) + 3H₂ (g) ⇒ 2NH₃ (g). 10 g N₂ x 1 mol NH₃/28 g N₂ x 3 mol H₂/1 mole N₂ ⇒ 1.07 mol H₂. V = nRT/P [From Ideal Gas Equation], V = 1.07 x 62.36 x 298 K / 735. V = 27.3 L
What is Nitrogen gas?A non-flammable atmospheric gas called nitrogen makes about 78% of the earth's atmosphere.
Nitrogen is prized for its inert qualities when it is gaseous because it replaces air, which lessens or stops items from oxidizing. Additionally, it serves as a laser cutting assist gas.
Nitrogen is a perfect gas for cryogenic cooling and freezing because of the incredibly low temperatures at which it exists in its liquid state. Almost any industry can use nitrogen to increase yields and maximize performance. It makes it possible to utilize and store flammables safely while also preventing the explosion of combustibles.
Therefore, 27.3 L. N₂ (g) + 3H₂ (g) ⇒ 2NH₃ (g). 10 g N₂ x 1 mol NH₃/28 g N₂ x 3 mol H₂/1 mole N₂ ⇒ 1.07 mol H₂. V = nRT/P [From Ideal Gas Equation], V = 1.07 x 62.36 x 298 K / 735. V = 27.3 L.
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1. In Eunice Foote's experiment comparing how different kinds of gases trap heat, a glass
cylinder filled with warmed the most.
a humid air
b. dry air
C. common air
d. carbon dioxide
Answer: D carbon dioxide
Explanation:
usually, carbon dioxide is the best gas for trapping heat. Our atmosphere has carbon dioxide in it to keep the heat of the Sun close so we can live. But too much of this gas as well as other greenhouse gases can cause the Earth to heat up more.
The question is in the attached screenshot. Thanks a lot
Answer:
your welcome
Explanation: