I think the answer is C. (Increasing the number of variables in the experiment)
Answer:
ITS B
Explanation:
THE OTHER GUY WAS WRONG
True or False: With a given number of moles of solvent, the solution will always have the same concentration
Answer:
Its true
Explanation:
Hope it helps, have a great day!!!
On the line provided, write the formula for the compound made by each of the following. (3 pts each) 20. Mgand NO3-1, 21. CIO3-1 and K 22. Ca and So4-2, 23. NH4+1 and SO4-2, 24. C2H30-1, ' and H 25. Hand CO, t
Answer:
20. Mg(NO3)2
21. KClO3
22. CaSO4
23. (NH4)2SO4
24. HC2H3O
25. CO is carbon dioxide, which is neutral and would not combine with a hydrogen ion. Did you mean H and CO3(2-)? That would be H2CO3 (carbonic acid)
Explanation:
You have to match the charges of the Cations and Anions.
What scientifically goes on with a plasma ball?
Answer:
the electrode at the center of a plasma ball emits a high-frequency,high-voltage alternating electric current. This current flows through the plasma filaments to create colorful tendrils of light.
Explanation:
what colors depend upon the gases used inside the plasma ball? common gases include neon, argon, xenon, and krypton.
What is the wavelength of a photon with a frequency of 4.72 x 1014 Hz?
A. 635 nm
B. 142 nm
C. 421 nm
D. 313 nm
Answer:
635 nm
Explanation:
more simple answer
The correct option is (a) 635 nm.
What is a simple definition of a wavelength?A wavelength that is carried in space or down a wire has a wavelength, which is the separation between two identical places (adjacent crests) in the consecutive cycles.Wavelength is usually denoted by the Greek letter lambda (λ)Given,
λ=6.36×10−7 m
Let C = the speed of light =3.00× [tex]10^{8}[/tex] m/s
Let f = the frequency = 4.72 × [tex]10^{14}[/tex] Hz
Let λ= the unknown wavelength
Now apply formula of wavelength
λ = C /f
λ = [tex]\frac{3.00 * 10^{8 }m/s }{4.72 * 10^{14} Hz}[/tex]
λ = 6.36 × [tex]10^{-7}[/tex] m
λ = 635 m
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Which of the following compound is most soluble in water a)glycerol b) ethyl alcohol c) ethylene glycol d)ethyl chloride
Answer:
glycerol
Explanation:
it is thick sweet liquid.It is type of alcohol which has 3 OH groups
a chemical formula is made up of carbon and oxygen. they have 27% and 73% respectively.
A.what is the empirical formula of the chemical substance?
B.name the compound you identified in A above.
Answer:
A. CO₂
B. carbon dioxide
Explanation:
To determine the empirical formula of a compound, we need to follow a series of steps.
Step 1: Divide each mass percent by the atomic mass of the element
C: 27/12.01 = 2.25
O: 73/16.00 = 4.56
Step 2: Divide all the numbers by the smallest one, i.e., 2.25
C: 2.25/2.25 = 1
O: 4.56/2.25 ≈ 2
The empirical formula of the compound is CO₂. The name of this compound is carbon dioxide.
Given the reaction below which of the following best describes the energy changes in this reaction?
Cu + Cl2 + energy —> CuCl2
Answer:
first choice
Explanation:
energy is written on the left side is its absorbed
2 elements came together so bonds are formed.
How many grams of O2 are needed to
combust 20.0 g of C3Hg?
Which of the following molecules have a dipole moment?
Select one or more:
CS2
SeS2
CINO
ВСІЗ
CClaF2
CO2
PCIE
Com
Answer:
cs2
Explanation:
chemistry in formula of water
Answer: Unbalanced : H2O
Balanced : 2H2O
Explanation:
plzz mark as brainliest
H2O
Explanation:
Water (chemical formula: H2O) is a transparent fluid which forms the world's streams, lakes, oceans and rain, and is the major constituent of the fluids of organisms. As a chemical compound, a water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds.
How many moles of O2 are needed to react with 2.55 mol of C2H2?
Express your answer to three significant figures
Answer: 6.38 moles of [tex]O_2[/tex] are needed to react with 2.55 mol of [tex]C_2H_2[/tex]
Explanation:
The balanced chemical reaction for the combustion of ethyne is:
[tex]2C_2H_2+5O_2\rightarrow 4CO_2+2H_2O[/tex]
According to stoichiometry:
2 moles of [tex]C_2H_2[/tex] require = 5 moles of [tex]O_2[/tex]
Thus 2.55 mol of [tex]C_2H_2[/tex] require = [tex]\frac{5}{2}\times 2.55=6.38[/tex] moles of [tex]O_2[/tex]
Thus 6.38 moles of [tex]O_2[/tex] are needed to react with 2.55 mol of [tex]C_2H_2[/tex]
What is the mass of 3.5 x 10 23 molecules of co2
Answer:
x = 3/6.02 = 0.50.
Explanation:
1 mole of CO2 has 6.02 x 10^23 molecules of CO2.
Say x moles of CO2 has 3.0x10^23 molecules of CO2.
Therefore x = 3/6.02 = 0.50.
Radium-222 undergoes radioactive decay to produce radon-218. Which
particle needs to be added to this equation to show that the total numbers of
neutrons and protons are not changed by the reaction?
22 Ra
21°Ra + ?
88
86
A. He
B. o
tie
c. Le
D. He
Answer:
2/4 HE
Explanation:
Ape.x
An electron in a hydrogen atom moves from level 3 to level 1. In a second hydrogen atom, an electron drops from level 2 to level 1. Which statement describes the most likely result?
Answer:
An electron in a hydrogen atom moves from level 3 to level 1. In a second hydrogen atom, an electron drops from level 2 to level 1. Which statement describes the most likely result? The first atom emits light with more energy.
explain why vendors keep 'dry ice' in their ice cream boxes
Vendors keep 'dry ice' in their ice cream boxes in order to prevent melting of dry ice.
Why vendors keep 'dry ice' in their ice cream boxes?Dry ice melts if it is placed in the open space because the carbondioxide gas is compressed with pressure. As carbon dioxide changes to gas, it escape to the atmosphere. If you use an airtight container such as ice cream box, the gas cannot escape.
So we can conclude that vendors keep 'dry ice' in their ice cream boxes in order to prevent melting of dry ice.
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Question
How much of 3 M NaOH will be required to make 100 mL of 0.05 M NaOH?
Select the correct answer below:
5 mL
1.7 mL
0.15 mL
30 mL
Answer:
1.7 mL
Explanation:
start with formula M1V1=M2V2
then plug in values (3)V1=(100)(.05) and solve for V1
V1= 1.66
According to molar concentration, 1.7 ml of of 3 M NaOH is required to make 100 ml of of 0.05 M NaOH.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
In case of 2 solutions, molarity is determined as, M₁V₁=M₂V₂
Substitution of values gives, V₁=0.05×100/3=1.7 ml.
Thus, 1,7 ml of 3 M NaOH will be required to make 100 mL of 0.05 M NaOH.
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What is the mass of an object with a volume of 2.0 mL and a density of 28.8 g/mL?
Answer:
your answer is really 308ml
Taking into account the definition of density, the mass of an object with a volume of 2.0 mL and a density of 28.8 [tex]\frac{g}{mL}[/tex] is 57.6 grams.
But first you must know the definition of density. Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
In this case, you know that:
Density= 28.8 g/mLVolume= 2 mLReplacing in the definition of density:
[tex]28.8 \frac{g}{mL} =\frac{mass}{2 mL}[/tex]
Solving:
mass= 28.8 [tex]\frac{g}{mL}[/tex] ×2 mL
mass= 57.6 g
In summary, the mass of an object with a volume of 2.0 mL and a density of 28.8 [tex]\frac{g}{mL}[/tex] is 57.6 grams.
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https://brainly.com/question/952755?referrer=searchResultshttps://brainly.com/question/1462554?referrer=searchResultsplease help me and dont send me a bitly link its a scam
Answer:
Explanation:
4)6.27x10^20/(6.02x10^23)(u should have this number on your formula sheet)=0.001 mol
5)7.4x6.02x10^23=44.548x10^23atoms
6)molar mass for K is 39.10g/mol
3.27x39.10=127.86g
Im bad at sig figs. Just do it urself(:p
A gas made up of atoms escapes through a pinhole 0.392 times as fast as Ne gas. Write the chemical formula of the gas.
Answer: The chemical formula of the gas is Xenon.
Explanation:
From Graham's law of effusion rates, the rate of effusion of a gas is inversely proportional to the square root of its molar mass.
[tex]\frac{rate_1}{rate_2}=\sqrt{\frac{M_2}{M_1}}[/tex]
Given: Rate of unknown gas = [tex]0.392\times R_{Ne}[/tex]
Putting the values in the formula:
[tex]\frac{rate_X}{rate_{Ne}}=\sqrt{\frac{M_{Ne}}{M_X}}[/tex]
[tex]0.392=\sqrt{\frac{20.17}{M_X}}[/tex]
Squaring both sides:
[tex]0.154=\frac{20.17}{M_X}[/tex]
[tex]M_X=131g/mol[/tex]
As Xenon (Xe) has molar mass of 131g/mol, Thus the chemical formula of the gas is Xenon.
The isomerization reaction, ch3nc → ch3cn, is first order and the rate constant is equal to 0.46 s-1 at 600 k. what is the concentration of ch3nc after 7.0 seconds if the initial concentration is 0.30 m?
Answer:
y=meme3squared
Explanation:
YEEEEEEEEEEEEEEEE
The pressure of an ideal gas stays constant at 2.57 atm.
This ideal gas has a volume of 45.8 mL when it is at a
temperature of 37.0°C. What temperature will this ideal gas
be at when it contracts to 32.5 mL?
Answer:
[tex]T_2=-53.15\°C[/tex]
Explanation:
Hello there!
In this case, in agreement to the Charles' law which states that the volume and temperature relate to each other via a directly proportional relationship at constant pressure, we can write:
[tex]\frac{T_2}{V_2} =\frac{T_1}{V_1}[/tex]
Thus, given V1, V2 and T1 (310 in Kelvin), we can solve for the final temperature as shown below:
[tex]T_2=\frac{T_1V_2}{V_1} \\\\T_2=\frac{310K*32.5mL}{45.8mL}\\\\T_2=220 K-273.15K\\\\T_2=-53.15\°C[/tex]
Best regards!
Help please science questions
It’s for 20 points
Answer:
1 , 2 , 3
Explanation:
Answer
Contributed by Paul Flowers, Klaus Theopold & Richard Langley et al.
General Chemistry at OpenStax CNX
Learning Objectives
Outline the general approach for the isolation of transition metals from natural sources
Describe typical physical and chemical properties of the transition metals
Identify simple compound classes for transition metals and describe their chemical properties
We have daily contact with many transition metals. Iron occurs everywhere—from the rings in your spiral notebook and the cutlery in your kitchen to automobiles, ships, buildings, and in the hemoglobin in your blood. Titanium is useful in the manufacture of lightweight, durable products such as bicycle frames, artificial hips, and jewelry. Chromium is useful as a protective plating on plumbing fixtures and automotive detailing.
A chemistry student weighs out 0.128g of chloroacetic acid HCH2ClCO2 into a 250.mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.0700M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the equivalence point. Be sure your answer has the correct number of significant digits.
Answer:
19.3 mL
Explanation:
First we convert 0.128 g of chloroacetic acid into moles, using its molar mass:
0.128 g ÷ 94.5 g/mol = 1.354x10⁻³ molAs this acid is monoprotic, it requires the same number of moles of NaOH to be neutralized. This means that 1.354x10⁻³ moles of NaOH are required.
Now we calculate the volume of NaOH solution, using the given concentration and calculated number of moles:
Molarity = moles / litersliters = moles / Molarity1.354x10⁻³ mol / 0.0700 M = 0.0193 LWe can convert liters into mL:
0.0193 L * 1000 = 19.3 mLWrite a balanced half-reaction for the reduction of bismuth oxide ion to bismuth ion in basic aqueous solution. Be sure to add physical state symbols where appropriate.
Answer:
[tex]3H_2O+(Bi^{5+}O_3)^-\rightarrow Bi^{3+}+6OH^-[/tex]
Explanation:
Hello there!
In this case, according to the required half-reaction, we start by setting it up from bismuth (V) oxide ion to bismuth (III) ion:
[tex]BiO_3^-\rightarrow Bi^{3+}[/tex]
Thus, next realize that the oxidation state of Bi in BiO3^- is 5+ because oxygen is 2- (-2*3+x=-1;x=-1+6;x=+5), so we obtain:
[tex](Bi^{5+}O_3)^-\rightarrow Bi^{3+}[/tex]
Thereafter, we realize three water molecules are needed on the right in order to balance the oxygens and consequently 6 hydrogen atoms on the left to balance hydrogen:
[tex]6H^++(Bi^{5+}O_3)^-\rightarrow Bi^{3+}+3H_2O[/tex]
Now, since the balance is is basic media, we add six molecules of hydroxide ions in order to produce water with the hydrogen ones:
[tex]6OH^-+6H^++(Bi^{5+}O_3)^-\rightarrow Bi^{3+}+3H_2O+6OH^-\\\\6H_2O+(Bi^{5+}O_3)^-\rightarrow Bi^{3+}+3H_2O+6OH^-\\\\6H_2O-3H_2O+(Bi^{5+}O_3)^-\rightarrow Bi^{3+}+6OH^-[/tex]
Then, we accommodate the waters to obtain:
[tex]3H_2O+(Bi^{5+}O_3)^-\rightarrow Bi^{3+}+6OH^-[/tex]
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A potential energy diagram is shown. What is the activation energy of this reaction?
a. 50 kJ
b. 100kJ
c. 150kJ
d. 200kJ
Answer: a. 50 kJ
Explanation: good luck
How are ionic compounds named?
Answer:
Ionic compounds are neutral compounds made up of positively charged ions called cations and negatively charged ions called anions.
Explanation:
For binary ionic compounds (ionic compounds that contain only two types of elements), the compounds are named by writing the name of the cation first followed by the name of the anion.
Which of the following equations correctly describes how to calculate net income? a. net income = (cost of goods sold) - (net sales) - (operating expenses) b. net income = (operating expenses) - (cost of goods sold) - (net sales) c. net income = (operating expenses) + (cost of goods sold) - (net sales) d. net income = (net sales) - (cost of goods sold) - (operating expenses) Please select the best answer from the choices provided A B C D Mark this and return
Answer:
The answer is D. net income= (net sales) - (cost of goods sold)- (operating expenses).
Explanation:
Which of these results from cell division?
A. cells expand their membranes and double in size
B. cells separate all of their organelles into smaller parts
C. multiple daughter cells share a single nucleus
D. multiple daughter cells are formed from one parent cell
Answer:
. multiple daughter cells are formed from one parent cell
(b) What is the frequency of violet light with a wavelength of 433 nm?
Frequency
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Demonstrate the definition with a chemical equation for HCl. Express your answer as a chemical equation including phases
Answer:
Here ya go!
Explanation:
