Answer: It is indeed A.Standard Solution.
Hope this helps you!
Identify this molecule:
a) alcohol
b) hydrocarbon
c) carbohydrate
d) lipid
e) amino acid
Answer:
C)
Explanation:
Which solution between molecular compounds denoted alkane and alkene, can be analyzed using a UV/Vis spectrophotometer? Explain.
Answer:
UV/Vis spectroscopy is routinely used in analytical chemistry for the quantitative determination of different analytes, such as transition metal ions, highly conjugated organic compounds, and certain biological macromolecules. Measurement is usually carried out in solution.
Explanation:
what do scientist study to reconstruct past climate conditions?
Why was the measurement unit for metal content in Experiments 1 and 2 different? In Experiment 1:
To identify why a metal measurement was different in the experiments look for the variable that was different in the experiment and analyze how this change affected the results.
What is an experiment?An experiment is a procedure that aims at probing or discovering something. For example, you can test if a plant grows faster/slower by using an experiment.
What causes different results in similar experiments?The most common cause for this situation is that one of the factors or variables is slightly different. For example, if I add 50mL of water to a plant rather than 20mL of water every day this might cause different results.
Based on this, if the metal content was different you should analyze if any of the factors changed in this experiment and find out how this change affected the general results.
Note: This question is incomplete because there is limited information about the experiment; due to this, I answered it based on general knowledge.
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write the molecular formula for each listed compound:
dinitrogen trioxide & nitrogen monoxide hydrochloric acid & chloric
acid sulfuric acid & sulfurous acid
Answer:
dinitrogen trioxide = N2O3
nitrogen monoxide = NO
hydrochloric acid = HCl
chloric acid = HClO3
sulfuric acid = H2SO4
sulfurous acid = H2SO3
One of the following solutions turns litmus papers to red:
A)POH=3
B)[OH−] = 1×10−7 M
C)[OH-] = 1×10−5 M
D)POH=12
Answer : D. pOH = 12
solutions turns litmus papers to red : acidic (pH<7)
pH + pOH = 14
A. pOH = 3, pH = 11, alkaline
B. [OH⁻] = 1 x 10⁻⁷ ⇒ pOH = - log [OH⁻]= 7, pOH = pH = neutral
C. [OH⁻] = 1 x 10⁻⁵ ⇒ pOH = - log [OH⁻]= 5, pH = 9, alkaline
D. pOH = 12, pH = 2, acidic
Answer:
d
Explanation:
ph is acid
acid litmus paper converts to red in acidic media
You mix a 110.0 −mL sample of a solution that is 0.0133 M in NiCl2 with a 200.0 −mL sample of a solution that is 0.250 M in NH3. After the solution reaches equilibrium, what concentration of Ni2+(aq) remains?
The value of Kf for Ni(NH3)62+ is 2.0×[tex]10^{8}[/tex] .
Based on the data provided, at equilibrium, the concentration of Ni2+ that remains is 4.268 ×10^-6 M
What is molar concentration of a solution?The molar concentration of a solution is the amount in moles of solute dissolved in a given volume of solution in litres.
Molar concentration = moles/volume in LitresTotal volume of solution after mixing = 110 + 200 = 310 mL
Concentration of Ni2+ = 0.0133M/( 310ml/110ml) = 0.00472M
Concentration of NH3 = 0.250M/(310ml/200ml) = 0.1613 M
Assuming complete formation of Ni(NH3)6, the equation of formation is given as:
Ni2+(aq) + 6NH3(aq) -------> Ni(NH3)62+ (aq)From equation of the reaction, 1 mole of Ni2+ reacts with 6 moles of NH3 to produce 1 mole of Ni[(NH3)6]2+
Then,
0.00472 M of Ni2+ react with 0.02832 M of NH3 to give 0.00472 M of Ni2+
Concentration of remaining NH3 = 0.1613 M - 0.02832M = 0.13298 M
The equation of dissociation at equilibrium of Ni(NH3)62+ is given as:
Ni[(NH3)6]2+(aq) <-------> Ni2+(aq) + 6NH3(aq)Kd = [Ni2+][NH3]6/[Ni(NH3)6]
Kd = 1/Kf = 1/ 2.0 × 10^8
Kd = 5.0 ×10^-9
Using an ICE chart;
Initial concentration:
[Ni(NH3)62+] = 0.00472
[Ni2+] = 0
[NH3] = 0.
Change in concentration:
[Ni(NH3)62+] = - x
[Ni2+] = + x
[NH3] = + 6x
Equilibrium concentration:
[ Ni(NH3)62+] = 0.00472 - x
[Ni2+] = x
[NH3] = 0.13298 + 6x
From the dissociation constant equation;
x(0.1330 + 6x)^6 / 0.00472 - x) = 5.0 ×10^-9
Assuming x is very small;
0.13298 + 6x = 0.132980.00472 - x = 0.00472x( 0.13298)^6/ 0.00472 = 5.0 ×10^-9
x × 0.00117= 5.0 ×10^-9
x = 4.268 ×10^-6 M
Therefore, at equilibrium, the concentration of Ni2+ that remains is 4.268 ×10^-6 M
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strong acid + weak base salt + water
the type of salt is ?
,..
there are 4 properties of salt
1. The salt of a strong acid and a strong base is neutral
2. The salt of a strong acid and a weak base is acidic
3. The salt of a weak acid and a strong base is basic
4. Salt of a weak acid and a weak base depends on the value of the ionization constant of the acid and base
So the salt from strong acid + weak base is acidic
and salts of strong acids and weak bases (pH<7) or of strong bases and weak acids (pH>7) will be partially hydrolyzed
Calculate the enthalpy of each reaction per
mole of reactant using the formula below, which
also converts joules to kilojoules. Record to 2
significant figures.
ΔH = -q/moles * kj/1000J
Reaction 1: __ kJ/mol
Reaction 2: __ kJ/mol
Answer:
Reaction 1: -450 kJ/mol
Reaction 2: -81 kJ/mol
Explanation:
These were the correct answers on Edge, 2022. Hope it helps!
Answer:
-450 and -81 are correct
Explanation:
edge 2022
Find the "natural" equilibrium concentration of NO in air in units of molecules/cm3 .
Answer:
6400 molecules / cm^3
Explanation:
10.6*10^-16 mol/L * 6.022*10^23 molecules/mol * 1 L / 1000 cm^3 * 1 / 100 L = 6400 molecules / cm^3
The "natural" equilibrium concentration of Nitric oxide in air in units of molecules/cm .0.062molecules/cm3
chemical equilibrium or equilibrium concentration is a state when the rate of forward reaction in a chemical reaction becomes equal to the rate of backward reaction. At the same time, there is no change in the products and reactants, and it seems that the reaction has stopped.
How do you find the equilibrium concentration?The equation for Beer's law is a straight line with the general form of y = mx +b. where the slope, m, is equal to εl. In this case, use the absorbance found for your unknown, along with the slope of your best fit line, to determine c, the concentration of the unknown solution.
Does equilibrium mean same concentration?Reversible reactions occur until equilibrium is established, meaning that they achieve a sort of balance between amounts of reactant and product. If the reactants and products are equal in energy, at equilibrium, they will have the same concentration.
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If 75% of the atoms are in the higher-energy parallel state, how many 21 cm photons are emitted per second by the cloud
2. Give an example of a chemical or physical process that illustrates the law of
conservation of mass.
Answer:
when wood burns
(PLS MARK BRAINLIEST) (hope it helps!)
Explanation: when wood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant
PLEASE HELPPP ASAPPPPP!!!!!
What is the number of protons neutrons and electrons in a family Osito that is used in medical diagnosis atomic number 43 mass number 99 charge of 7+
Answer:
43 protons
36 electrons
56 neutron
Explanation:
neutron is mass number minus proton number.
in a non neutral atom the electron is determined after minusing the charges or electron lost.
the number of proton obviously is 43
7. Which agency of the government in the Philippines is monitoring the movement of the earth crust? a. DENR c. DOST b. PAGASA d. PHIVOLCS
Answer:
Is d PHIVOLCS
Explanation:
PHIVOLCS stands for Philippine Institute of Volcanology and Seimology.
This agency monitors the movements of the earth's crust and warns if there is any possibility of disaster such as volcanic, tsunami and earthquake.
What would be the energy in problem 1?
[tex]\\ \rm\Rrightarrow E=h\nu[/tex]
[tex]\\ \rm\Rrightarrow E=6.626\times 10^{-34}\times 9.68\times 10^{19}[/tex]
[tex]\\ \rm\Rrightarrow E=64.1\times 10^{-15}J[/tex]
[tex]\\ \rm\Rrightarrow E=641\times 10^{-16}J[/tex]
[tex]\\ \rm\Rrightarrow E=641eV[/tex]
The movement of solid particles can be described as ________.
Answer:
liquid vibrate, move about, and slide past each other. solid vibrate (jiggle) but generally do not move from place to place.
Explanation:
What would be the osmotic pressure at 65 °C of an aqueous solution containing 2.50 g of sucrose (C12H22011) per 205 ml of solution?
The osmotic pressure at 65 °C of an aqueous solution containing 2.50 g of sucrose is 0.988 atm
How to determine the mole of sucrose Mass of sucrose = 2.5 gMolar mass of sucrose = 342 g/mol Mole of sucrose =?
Mole = mass /molar mass
Mole of sucrose = 2.5 / 342
Mole of sucrose = 0.0073 mole
How to determine the molarity of sucrose Mole of sucrose = 0.0073 mole Volume = 205 mL = 205 / 1000 = 0.205 L
Molarity =?
Molarity = mole / Volume
Molarity of sucrose = 0.0073 / 0.205
Molarity of sucrose = 0.0356 M
How to determine the osmotic pressure Molarity (M) = 0.0356 MTemperature (T) = 65 °C = 65 + 273 = 338 KGas constant (R) = 0.0821 atm.L/Kmol Van't Hoff factor (i) = 1 (sucrose is non-electrolyte) Osmotic pressure (π) =?
π = iMRT
π = 1 × 0.0356 × 0.0821 × 338
π = 0.988 atm
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How does refrigeration keep food fresher?
It speeds up reaction rates within stored food.
It slows down reaction rates within stored food.
It causes food molecules to stop vibrating.
Cold air surrounds food and slows the spoiling process.
Answer:
Cold air surrounds food and slows the spoiling process
How would you prepare 0.400L of 0.155M Sr(OH)2 from solid Sr(OH)2?
Initially, we will consider only solutions of a solid in ... (d) Calculate the volume (in mL) of 0.1065 M Sr(OH)2 required to titrate 25.00 mL of 0.2465 M.
:
Explanation:
entropy increases when
A. dew forms from water vapor in the air
B. boiling water cools to room temperature
C. sodium chloride crystals dissolve in water
D. hydrogen gas and oxygen gas combine to form liquid water
Answer:
A. dew forms from water vapor in the air
Explanation: As dew formation is spontaneous process, therefore, entropy of the universe will increase.
zinc sulfide + magnesium arsenate → zinc arsenate +
magnesium sulfide
Convert to formula equation
The formula equation for the reaction between zinc sulfide and magnesium arsenate is
3ZnS + Mg₃(AsO₄)₂ → Zn₃(AsO₄)₂ + 3MgS
What is a chemical equation?Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The reactants are located on the left side while the products are located on the right side.
Reactants —> Products
The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
How to write the formula equationZinc sulfide => ZnS
Magnesium arsenate => Mg₃(AsO₄)₂
Zinc arsenate => Zn₃(AsO₄)₂
Magnesium sulfide => MgS
Zinc sulfide + Magnesium arsenate → Zinc arsenate + Magnesium sulfide
3ZnS + Mg₃(AsO₄)₂ → Zn₃(AsO₄)₂ + 3MgS
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State what could be used to keep the temperature of the conical flask and its
contents at a temperature of 45 °C throughout the reaction.
A water bath can be used to keep the temperature of the conical flask and its contents at a temperature .
What is a Water bath?This is a laboratory equipment which contains a heated source and is used to incubate samples in water at a constant temperature over a period of time.
This is why water bath will be best used to keep the temperature of the conical flask and its contents at a temperature of 45 °C throughout the reaction.
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which among the following can be attracted by a magnet, why?
an iron-
a piece of paper
A. Which number is equal to the number of protons in the atom
What mass of nitrogen trifluoride can be produced when 32.0 G of fluorine is reaction according to the table below
N2+3F2= 2NF3
When 32.0 g of F₂ react with enough N₂, 39.86g of NF₃ are formed.
What is stoichiometry?Stoichiometry is the study of the quantitative relationships or ratios between two or more substances undergoing a physical change or chemical change.
Let's consider the following balanced equation.
N₂ + 3 F₂ ⇒ 2 NF₃
To calculate the mass of NF₃ formed from 32.0 g of F₂, we need to consider the following relationships.
The molar mass of F₂ is 38.00 g/mol.The molar ratio of F₂ to NF₃ is 3:2.The molar mass of NF₃ is 71.00 g/mol.[tex]32.00gF_2 \frac{1molF_2}{38.00gF_2} \frac{2molNF_3}{3molF_2} \frac{71.00gNF_3}{1molNF_3} = 39.86gNF_3[/tex]
When 32.0 g of F₂ react with enough N₂, 39.86g of NF₃ are formed.
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What type of galaxy is the Milky Way?
O elliptical galaxy
O barred-spiral galaxy
O irregular galaxy
O large-clustered galaxy
Answer:
B is the answer
We are in a spiral galaxy but as of late scientists believe we are in a barred-spiral galaxy.
Explanation:
Hope this helped.
A brainliest is always appreciated.
Milky way is a type of barred-spiral galaxy.
What is a galaxy?
A galaxy is defined as a system of stars, stellar remainings, interstellar gas, dust, dark matter, which are bound together by means of gravity.The word is derived from the Greek word which literally means 'milky',as a reference to the Milky Way galaxy which contains the Solar System.
Most of the mass which is present in a galaxy is present in the form of dark matter, out of which only a few percent of the mass
is visible. Supermassive black holes are a common characteristic which are present at the centres of galaxies.
Galaxies are categorized as per their morphology in the shape of elliptical, spiral, or irregular. Many are believed to have supermassive black holes which are present at their centers. The Milky Way's central black hole which is present , also known as Sagittarius A*, has a mass which is four million times greater than the Sun.
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1) (d) Metal M has two isotopes. The table below shows the mass numbers and percentage abundances of the isotopes. Percentage abundance (%) Mass number 30 203 70 205 Calculate the relative atomic mass (A) of metal M. Give your answer to 1 decimal place. Relative atomic mass (1 decimal place) (2) T14
The relative atomic mass of the metal, M is calculated as 204.4amu.
How to calculate relative atomic mass?The relative atomic mass of a isotopic element can be calculated by summing the abundance of each isotope in the element. That is;
(mass no of isotope 1 × % abundance) + (mass no of isotope 2 × % abundance)
According to this question, metal M has two isotopes with the following mass numbers and % abundance:
Isotope 1 = 30%, 203Isotope 2 = 70%, 205(30/100 × 203) + (70/100 × 205)
60.9 + 143.5 = 204.4
Therefore, the relative atomic mass of the metal, M is calculated as 204.4amu.
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can ubguys help me to answer it
KF + 02
Balance the equation
Explanation:
this equation is balanced
if you look at it carefully
k=1
f=1
o=2
we do not have any opposing element
Answer:
this equation is balanced
if you look at it carefully
k=1
f=1
o=2
we do not have any opposing element
