Answer:
Explanation:
molecules NH3 = 1.47 moles x 6.02x1023 molecules/mole = 8.9x1023 molecules of NH3
8. Of what importance is a smoker to a person keeping bees?
Answer:
they help to calm the bees when the person keeping the bees inspects there hives.
Scenario: You are testing two different household solutions with your cabbage indicator, using the color key to the right.
One solution turns blue. A possible hydrogen ion concentration for this solution is: D
1 × 10-2 M
5 × 10-2 M
5 × 10-4 M
1 × 10-8 M
Answer:
DDDDD
Explanation:
According to the indicator theory, the hydrogen ion concentration for this solution is 1 × 10⁻⁸ M.
What is an indicator?Indicator is defined as a chemical substance which is chemically a weak acid or a weak base which changes it's color depending upon the concentration of hydrogen ions present in the solution.They dissociate slightly in water to produce ions.
These are generally derived from plant pigments and are of slightly acidic or basic in nature.There are three types of indicators:
1) natural indicators
2) synthetic indicators
3) olfactory indicators.
These are mainly used in determination of end point of titrations. Every indicator has it's pH range in which it can perform effectively.These are usually organic compounds.
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name 2 things that cholesterol is used for
Infer why it is important to add sodium chloride to
water when making homemade ice cream.
Answer:
the addition of sodium chloride to water effect a lowering of the melting point of water such that the liquid cream or water mixture tends to solidify upon churning when in thermal contact with the mix indigrents
Which of these oceans remain frozen accept for part of the year, when the edges melt?
Pacific
Southern
Atlantic
Indian
Artic
Answer:
artic is correct please give brainliest please??
what is it called when a plant produces an abundant life
Answer:
reproduction i would believe
Explanation:
if correct plz mark brainliest
Answer:
Reproduction :)
Explanation:
hope this helps
PLEASE HELP ME OUT. I AM REALLY LOST AND I JUST NEED THIS LAST QUESTION I WILL BE GRATEFUL AND WILL GIVE BRANLIEST!
PLEASE HELP ME OUT. I AM REALLY LOST AND I JUST NEED THIS LAST QUESTION I WILL BE GRATEFUL AND WILL GIVE BRANLIEST!
PLEASE HELP ME OUT. I AM REALLY LOST AND I JUST NEED THIS LAST QUESTION I WILL BE GRATEFUL AND WILL GIVE BRANLIEST!
Explanation:
—COOH and —NH₂
Carboxylic Acid and Amino
What event occurs when the
tension built up along Earth's
plates is released causing one
plate to slip past another?
Answer:
An earthquake
Explanation:
your friend says that there is a kind of fue that only dries when it is exposed to a special type of light.can light cause glue to dry?
Answer:
No. Light is not a physical thing, so it cannot change physical things like glue.
Explanation:
Light is not effective at all to glue, it doesn't do anything at all.
8. Shanice made a list about alkali metals.
Alkali Metals
Jose one electron
are found in
group one
include elements
Li, Na, and K
ions will have a
negative one
charge
Shanice made a mistake on her list. Which
best describes the mistake Shanice made?
A. Alkali metals do not lose one electron,
they gain one electron
B. Alkali metals are not found in group one;
they are found in group two.
C. Alkali metals do not include elements Li.
Na, and K, they include Al, Si, and P.
D. Alkali metal ions will not have a negative
one charge; they will have a positive one
charge
Answer:
D. Alkali metal ions will not have a negative one charge; they will have a positive one charge
Explanation:
Alkali metals are a found towards the left hand side of the periodic table. The comprise of Li, Na, K, Rb, Cs and Fr.
They form univalent positive ions such as Cs^+, Na^+ etc. They do not form negative ions but give out one electron to form the sort of ions stated above. Recall that metals are electropositive in nature (donate electrons).
The mistake made by Shanice is to say that group 1 elements have a negative one charge.
Count the total atoms
Answer:
10
Explanation:
1 Fe atom+ 3 nitrogen atoms+ 6 oxygen atoms= 10 atoms
Calculate the volume of chlorine at stp that would be required to act completely with 3.70g of dry slaked line
Answer:
The volume required is 2.24L
Explanation:
The slaked lime Ca(OH)2, reacts with chlorine, Cl2, as follows:
6Cl₂(g) + 3Ca(OH)₂(s) → Ca(ClO₃)₂ (aq) + 2CaCl₂ (aq) + 6HCl (aq)
Where 6 moles of chlorine react with 3 moles of slaked llime,
To solve this question we must find the moles of slaked lime added. With these moles we can find the moles of chlorine required and its volume at STP as follows:
Moles Ca(OH)2 - Molar mass: 74.093g/mol-
3.70g * (1mol / 74.093g) = 0.0500 moles Ca(OH)2
Moles Cl₂:
0.0500 moles Ca(OH)2 * (6 mol Cl₂ / 3 mol Ca(OH)2) =
0.100 moles Cl₂
Now using PV = nRT
nRT / P = V
Where n are moles: 0.100 moles
R is gas constant = 0.082atmL/molK
T is absolute temperature = 273K at STP
P is pressure = 1atm at STP
And V is volume, our incognite:
0.100mol*0.082atmL/molK*273K / 1atm = V
2.24L = Volume of Cl₂
The volume required is 2.24LIn the illustration, which solute will dissolve first?
00.0
00.0
tanka
tank
Solute in Tanks A and B will dissolve at equal rates.
Solute in Tonk Awill dissolve first
Soluten Tork B wil dissolves
The first to dissolve is the solute in tank B. The amount of a substance that dissolves in a specific solvent concentration at a specific temperature is known as its solubility.
Which phase of the dissolving process is the first?The introduction of a solute to a solvent is the first stage in the dissolving process. The molecules of these two substances begin to interact, causing the solute molecules to disperse and become encircled by solvent molecules.
Which of the following three compounds dissolves in water?In water, salt, sugar, and coffee all dissolve. They disintegrate quickly. They typically dissolve more rapidly and completely in hot or warm water. Even very hot water won't be able to dissolve sand or pepper.
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Predict the nature of the indicated covalent
bond.
polar or non-polar
The nature of the indicated covalent bond in water molecule is polar.
What is a covalent bond?A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.
Examples of compounds that exhibit covalent bondOxygenChlorine gasWater (H₂O), etcPolarity of waterThe atoms that make up the molecule of water causes the water molecule to be polar because of its shape.
Thus, the nature of the indicated covalent bond in water molecule is polar.
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Describe the two methods to increase the rate at which a substance dissolves.
Calculate the mass in grams of 550 mol of aluminum
Help please!
Answer:
Explanation:
1 mol of Aluminum = 26.98 grams
550 mol of Aluminum = x
1 * x = 550 * 26.98
x = 14839 grams
Plllllzzzzzzzz helppppppppppp science helpppp 20 points plzzz help.
Sierra has a special kind of liquid rubber. She knows that ultraviolet light is absorbed by the rubber, X-ray light is transmitted through the rubber, and blue light is reflected off the rubber. Sierra wonders if the liquid rubber will become solid if she shines the lights on it. Can light cause the rubber to become solid? Why or why not? Does it matter what type of light she shines on the rubber?
Answer:
yes it can because heat can solidify the rubber and it does matter what light
Explanation:
The light can cause the rubber to become solid. It doesn't matter the type of light.
Any type of light can cause the rubber to become solid because all types of
light emit thermal(heat) radiation. When they are emitted , it causes the
vaporization of some compounds thereby causing it to solidify.
In this scenario, the rubber being able to absorb ultraviolet light simply
depicts that it will solidify as a result of an increase in temperature due to
the thermal radiation.
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A 130.0-mLmL sample of a solution that is 3.0×10−33.0×10−3 MM in AgNO3AgNO3 is mixed with a 225.0-mLmL sample of a solution that is 0.14 MM in NaCNNaCN. For Ag(CN)2−,Ag(CN)2−, Kf=1.0×1021Kf=1.0×1021. After the solution reaches equilibrium, what concentration of Ag+(aq)Ag+(aq) remains?
Answer:
1.2x10⁻²³M = [Ag⁺]
Explanation:
The Kf of Ag(CN)₂⁻ is:
Ag⁺(aq) + 2CN⁻ → Ag(CN)₂⁻(aq)
Kf = 1.0x10²¹ = [Ag(CN)₂⁻] / [Ag⁺] [CN⁻]²
Where [] are equilibrium concentrations.
The initial concentrations of the reactants are:
[Ag⁺] = 3.0x10⁻³M * (130mL / 355mL) = 1.10x10⁻³M
335mL is the total volume of the solution
[CN⁻] = 0.14M * (225mL / 355mL) = 0.089M
In equilibrium, the concentrations are:
[Ag⁺] = 1.10x10⁻³M - X
[CN⁻] = 0.089M - 2X
Ag(CN)₂ = X
Replacing in Kf expression:
1.0x10²¹ = [Ag(CN)₂⁻] / [Ag⁺] [CN⁻]²
1.0x10²¹ = [X] / [1.10x10⁻³ - X] [0.089 - 2X ]²
1.0x10²¹ = [X] / 8.7131×10⁻⁶ - 0.0083126 X + 0.3604 X² - 4 X³
8.7131×10¹⁵ - 8.3126×10¹⁸ X + 3.604×10^20 X² - 4x10²¹ X³ = X
8.7131×10¹⁵ - 8.3126×10¹⁸ X + 3.604×10^20 X² - 4x10²¹ X³ = 0
X = 0.0011M → Right solution.
X = 0.0445M → False solution. Produce negative concentrations
Replacing:
[Ag⁺] = 0
[CN⁻] = 0.0868M
Ag(CN)₂ = 0.0011M
The equilibrium will shift to the left just a little bit until produce a determined amount of Ag⁺ that we can write as:
[Ag⁺] = X
Thus:
1.0x10²¹ = [0.0011] / [X] [0.0868M ]²
1.2x10⁻²³M = [Ag⁺]The circulatory system works with other systems to (select all that apply)
Answer:
where are the answer choices
What do you know about plants cell and animal cells?
restate the answer and answer it
Explanation:
Plant cells have a cell wall, as well as a cell membrane. In plants, the cell wall surrounds the cell membrane. This gives the plant cell its unique rectangular shape. Animal cells simply have a cell membrane, but no cell wall.
what is a substance?
How many mililiters are there in a .5 M solution in which 60 grams of Li?
Answer:
10
Explanation:
Help! I need help on how to do these problems.
Answer:
a. 3; b. 5; c. 10; d. 12
Explanation:
pH is defined as the negative log of the hydronium concentration:
pH = -log[H₃O⁺] (hydronium concentration)
For problems a. and b., HCl and HNO₃ are strong acids. This means that all of the HCl and HNO₃ would ionize, producing hydronium (H₃O⁺) and the conjugate bases Cl⁻ and NO₃⁻ respectively. Further, since all of the strong acid ionizes, 1 x 10⁻³ M H₃O⁺ would be produced for a., and 1.0 x 10⁻⁵ M H₃O⁺ for b. Plugging in your calculator -log[1 x 10⁻³] and -log[1.0 x 10⁻⁵] would equal 3 and 5, respectively.
For problems c. and d. we are given a strong base rather than acid. In this case, we can calculate the pOH:
pOH = -log[OH⁻] (hydroxide concentration)
Strong bases similarly ionize to completion, producing [OH⁻] in the process; 1 x 10⁻⁴ M OH⁻ will be produced for c., and 1.0 x 10⁻² M OH⁻ produced for d. Taking the negative log of the hydroxide concentrations would yield a pOH of 4 for c. and a pOH of 2 for d.
Finally, to find the pH of c. and d., we can take the pOH and subtract it from 14, giving us 10 for c. and 12 for d.
(Subtracting from 14 is assuming we are at 25°C; 14, the sum of pH and pOH, changes at different temperatures.)
Calculate magnetic moment of a divalent ion in aqueous solution, if the electronic configuration is [Ar] 3d5 .
Answer:
5.47 B.M
Explanation:
✓We were given electronic configuration of argon as [Ar] 3d5.
✓This is a divalent ion. It has atomic number of 25.
✓magnetic moment can be calculated using below expresion
√[n(n+2)] .....................eqn(1)
✓ It has 5 unpaired electrons. Then n= 5
✓ [n(n+2)]
✓ substitute the ( n= 5) into eqn(1)
Then magnetic moment= [n(n+2)]
= [ 5(5+2) ]
= 5.47BM
Given the reaction: 3() + () → 3() + 2()
. Which of
the following statement is TRUE?
a. 1 mole of 3()
is needed to react with 1 mole NaOH to produce a
product.
b. 1 mole of 3()
is needed to react with 1 mole of water to produce a
product.
c. 1 mole of 3()
is needed to react with 1 mole of NaOH to produce the
product.
d. All of the above
Answer:
i think d is the answer for this
is saturated fat the same as trans fat?
Answer:
Saturated fat occurs naturally in red meat and dairy products. It's also found in baked goods and fried foods. Trans fat occurs naturally in small amounts in red meat and dairy products. Trans fat can also be manufactured by adding hydrogen to vegetable oil.
what’s the answer to number 6 ty!!
Answer:
0.00032 M
Explanation:
From the question,
Applying the for pH
pH = -log[H⁺]............... Equation 1
Where H⁺ = Hydrogen ion concentration of Hydrochloric acid
Given: pH = 3.50
Substitute into equation 1 and solve for H⁺
3.50 = -log[H⁺]
Taking the log inverse of both side,
H⁺ = 10⁻⁽³⁵/¹⁰⁾
H⁺ = 0.00032 M
Hence the H⁺ of Hydrochloric acid is 0.00032 M
Counting atoms pls someone help me
What is the velocity of a wave with a frequency of 10 Hz and a wavelength of
2 m?
A. 0.2 m/s
B. 20 m/s
C. 5 m/s
D. 8 m/s
SUBMIT
Answer:
B. 20m/s
Explanation:
The wavelength of a wave can be calculated using the formula;
λ = v/f
Where;
λ = wavelength (m)
v = velocity (m/s)
f = frequency (Hz)
According to the information provided in this question; the wave has a wavelength (λ) of 2m and a frequency (f) of 10Hz.
Using λ = v/f
v = λ × f
v = 2 × 10
v = 20m/s.
which technology would be the most useful in predicting an eruption from an undersea volcano and why
Answer: Infrasound because sound waves travel easily through water to accessible buoys.
Explanation: its installation: underwater microphones hung from buoys near a volcano. how it works: senses low-frequency sound waves near a volcano. Since in its installation it specifies that it has UNDERWATER microphones and the question asks in predicting an eruption from an UNDERSEA volcano, that makes perfect sense.
Volcanologists utilize a technique called infrasound monitoring to pick up low-frequency pitches that are inaudible to human hearing and to pick up rumblings and explosions inside volcanoes. A crater can be altered by volcanic activity, which alters the shape of the infrasonic sound waves that are emitted by the volcano.
What is volcano ?An opening in the crust of a planet or moon known as a volcano allows molten rock, heated gases, and other things to erupt. As layers of rock and ash accumulate from numerous eruptions, volcanoes frequently take the form of a hill or mountain. There are three types of volcanoes: active, dormant, and extinct.
Seismographic detection of the earthquakes and tremor that almost invariably precede eruptions, as well as exact measurements of the ground deformation that frequently coincides with the ascent of magma, are just a few of the many methods that scientists employ to monitor volcanoes.
Tiny movements along a volcano can be a sign of an impending eruption because of rock fractures along the magma chamber. Scientists can enter this data and utilize GPS and satellites to measure this deformation.
Thus, A crater can be altered by volcanic activity, which alters the shape of the infrasonic sound waves that are emitted by the volcano.
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