Answer: D
Explanation:
The litmus paper will help determine the pH, and thus if it is an acid or a base.
Carbonic acid, H₂CO₃ is a diprotic acid with Ka1 = 4. 3 × 10⁻⁷ and Ka2 = 5. 6 × 10⁻¹¹. What is the pH of a 0. 47 M solution of carbonic acid?
Based on the calculations, the pH of a 0.47 M solution of carbonic acid (H₂CO₃) is equal to 3.35.
How to calculate the pH of a solution?First of all, we would write a properly balanced chemical equation for these chemical reactions:
H₂CO₃(aq) ⇄ HCO₃⁻(aq) + H⁺(aq); Ka₁ = 4.3 × 10⁻⁷.
For the second chemical reaction:
HCO₃⁻(aq) ⇄ CO₃²⁻(aq) + H⁺(aq); Ka₂ = 5.6 × 10⁻¹¹.
Next, we set up an equation from the ICE table;
[HCO₃⁻] = [H⁺] = x.
[H₂CO₃] = 0.47 - x.
Ka₁ = ([HCO₃⁻] × [H⁺])/[H₂CO₃].
4.3 × 10⁻⁷ = (x × x)/(0.47 - x).
4.3 × 10⁻⁷ = x²/(0.47 - x).
x² = 0.0000002021 - 4.3 × 10⁻⁷x
x² + 4.3 × 10⁻⁷x - 0.0000002021 = 0
By solving the quadratic equation, we have:
x = [H⁺] =0.000449 M.
Now, we can determine the pH by using this formula;
pH = -log[H⁺]
pH = -log(0.000449 M).
pH = -(-3.35)
pH = 3.35.
Note: The second dissociation from Ka₂ would be so small, so it's considered negligible.
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If 4. 0 moles of propane are mixed with 15. 0 moles of oxygen o 2, how many moles of water h 2o will be formed?.
12 moles of water are produced when 4.0 moles of propane are mixed with 15.0 moles of oxygen,
What is a combustion reaction?A combustion reaction is one in which a substance reacts with oxygen releasing heat and light energy.
People burns in oxygen to produce carbon (iv) oxide and water according to the equation below:
[tex]C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O[/tex]
1 mole of propane reacts with 5 moles of oxygen to produce 4 moles of water.
15 moles of oxygen will react with 3 moles of propane to produce 12 moles of water.
Therefore, If 4.0 moles of propane are mixed with 15.0 moles of oxygen, 12 moles of water are produced
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What are requirements before you can compare the energy (or enthalpy or Gibbs free energy) for 2 compounds
The main two requirements to compare the energy for 2 compounds are the balanced chemical formula and the temperature of the compounds.
How do we calculate the free energy change?Gibb's free energy change of any reaction will be calculated by using the below equation as:
ΔG = ΔH - TΔS, where
ΔH = change in enthalpy
T = temperature
ΔS = change in entropy
Before calculating the free energy of any reaction you should first balance the given chemical reaction to check the involved moles of substance and also the value of temperature before & after the completion of reaction to check the nature of the reaction.
Hence balancing the equation and checking the temperature are the two requirements.
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Which statements describe how heat flows in foil? Check all that apply. Heat flows in all directions. Heat flows from left to right only. The atoms on top of the foil absorb heat first. The atoms near the candle absorb heat first. Heat flows from the cooler atoms to the warmer atoms. Heat flows from the warmer atoms to the cooler atoms.
Answer:
A D F
Explanation:
Its right but its not in order But its A D and F
Answer:
answer in picture
Explanation:
Two atoms of a single element that differ in number of neutrons are said to represent two distinct ________ of that element. a. isotherms b. atomic species c. isotopes d. isomers
Answer:
C
Explanation:
Isotopes are atoms of the same elements having same atomic number but different mass number
The picture above shows a water wave hitting the beach. Which of the following is true about this process?
A.
Neither energy nor water is transferred to the shore.
B.
As energy transfers from the water to the shore, the water travels with the energy.
C.
Water is transferred to the shore, but energy does not travel with the water.
D.
Energy is transferred from the water to the shore, but the water does not travel with the energy.
Answer:
C.
Energy is transferred from the water to the shore, but the water does not travel with the energy.
Explanation:
STUDY ISLAND TOLD ME
Mass of cl that could be obtained from 500kg of tubocurarine. (C37H422N2O6)
Based on the percentage mass of chlorine in tubocurarine, the mass of chlorine in 500 kg of tubocurarine is 52.13 kg.
What is the percentage mass of chlorine in tubocurarine?Tubocurarine chloride is the chloride salt form of tubocurarine which has the molecular formula below:
[tex]C_{37}H_{42}Cl_2N_2O_6[/tex]
The molecular mass of tubocurarine = 681 g/mol
mass of chlorine in tubocurarine = 71 g
Percentage mass of chlorine = 71/861 × 100% = 10.4%
Mass of chlorine in 500 kg of tubocurarine = 500 Kg × 10.4%
mass of chlorine in tubocurarine = 52.13 kg
Therefore, the mass of chlorine in 500 kg of tubocurarine is 52.13 kg.
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Why is brass more suitable than copper for a key?
Answer:
Brass does not bend as easily as copper.
Explanation:
Brass has more durability due to it having zinc in it.
Answer: Alloy strength
Explanation:
Copper and zinc atoms are different sizes. This distorts the regular lattice structure in brass, so layers of atoms cannot slide over each other so easily. This makes brass stronger than copper or zinc alone.
How many electrons can there be in the 3d subshell?.
What properties are used to arrange the
elements in the periodic table.
Answer:
Elements are arranged from left to right and top to bottom in order of increasing atomic number. As, The modern periodic law tells that the Elements in the modern periodic table are arranged by increasing atomic numbers.
Answer:
See below ~
Explanation:
Properties used to arrange elements
Atomic numberValencyNumber of shellsMelting PointElectronic Configurationetc.What volume will 50. 0 g of nitrogen gas occupy at STP?
Answer:
39.98 liters
Explanation:
hope this helps
I need some help pls with science
Answer:
the answer to number 9 is A.
Explanation:
What energy source is composed of hydrocarbon compounds.
Answer:
The answer is Crude oil, natural gas, and coal.
Explanation:
Hydrocarbon are highly combustible and produce carbon dioxide, water, and heat when they are burned.
-Hope this helps!
-Justin
Match the states of matter to their properties. Drag the items on the left to the correct location on the right.
solids
liquids
gases
indefinite shape, but definite volume
indefinite shape and indefinite volume
definite shape and definite volume
lowest density
particles glide past each other
highest density
solids Highest density definite shape and colour
liquids Indefinite shape and defining volumes particles glide past each other
Gases Indefinite shape Indefinite volume lowest density
Explanation:
this is due to the nature of its molecules
Some volatile organic compounds can be detected by hydrogeologists in the field or labs because of the ______ emitted from the groundwater and/or soil samples. Multiple choice question.
Volatile organic compounds can be detected by hydrogeologists in the field or labs because of the odor of the vapors emitted from the groundwater and/or soil samples.
What are volatile substances?Volatile substances are substances which can easily vaporize or change to gaseous state.
Volatile substances can either be solids or liquids but are mostly liquids.
Example of volatile substances include ether, petrol, chocolate.
The presence of volatile substances can be detected by the gases they release which may have characteristic odors.
Therefore, volatile organic compounds can be detected by hydrogeologists in the field or labs because of the odor of the vapors emitted from the groundwater and/or soil samples.
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When referring to immunity, what does the term innate imply?
the mechanism will provide defense against many different types of pathogens
the mechanism will develop based upon exposure to specific pathogens
the mechanism will be built-in and present at birth
the mechanism will be acquired over an individual's lifetime
Answer:
vVv
Explanation:
innate means "inborn or natural", meaning they were born with it. if somewhat is born with an inate immunity, it means it was passed through genetics aka heredity
What happens to the molar volume when the pressure increases? molar volume increases molar volume decreases molar volume stays the same
Answer:
This increases our molar volume relative to an ideal gas, which results in a value of Z that is greater than 1.
Explanation:
textbook
Answer:
B. Molar volume decreases
Explanation:
what factors are included in the Beer's Law expression that determines how much light passes through a liquid solution
Answer:
here.
Explanation:
molar absorptivity, path length of cuvette, test tube, and concentration.
suppose that 4.1 L of methane at a pressure of 618 Torr is transferred to a vessel of volume 2.8 L what is the final Pressure of methane if the change occurs at constant temperature? answer in units of Torr
Where do electromagnetic waves move slowest?
Answer:
Solids
Explanation:
Electromagnetic waves travel fastest in empty space. But they are slowest in solids
Which 1.0 liter sample of HCl (aq) contains the least number of moles of solute particles?
Your answer:
0.010 M
0.10 M
1.0 M
10.0 M
Least no of moles means it should be 1mol
Volume in Litre=1LHence
Molarity=Moles/VolumeMolarity=1/1=1MWhat are you doing when you figure out whether a claim is true or not?
O A. Finding
O B. Complicating
C. Evaluating
O D. Claiming
Answer:
Either A. or C. Evaluating, but most likely C.
Explanation:
The reason it is C is because to find out wheather something is true or not, you are not claiming otherwise nor complicating, you are finding, but evaluating sounds better.
Why must a new flu vaccine be manufactured annually?
Se*ual reproduction between flu viruses creates new strains.
The genes for the proteins on the exterior of the flu virus mutate frequently.
The flu causes mutations in the host cell DNA.
The flu virus develops methods to break down the vaccine.
Answer:
D or A
But I do know...
It's because new strains of the virus are constantly appearing and evolving, so the vaccine must change along with them.
Which of the following is not a reason childhood friendships are important to development? a. positive relationships provide positive psychological support. b. friends are a child's first chance in learning how to be social with siblings. c. adolescents can use friendships as a way to work out personal problems. d. children can learn what it means to be loyal through their friendships. please select the best answer from the choices provided a b c d
Which material is an insulator against electric current?
copper wire
a rubber tire
a silver necklace
a light bulb filament
Answer:
b) a rubber tire
Explanation:
Answer: B - a rubber tire
Explanation: Rubber is an insulator
Explain how antacid works.
An antacid is a substance which neutralizes stomach acidity and is used to relieve heartburn, indigestion or an upset stomach. Some antacids have been used in the treatment of constipation and diarrhea. Marketed antacids contain salts of aluminum, calcium, magnesium, or sodium.
Antacids help to treat heartburn (indigestion). They work by neutralizing the stomach acid that causes heartburn. You can buy many antacids without a prescription. Liquid forms work faster, but you may like tablets because they are easy to use.
The more gas molecules that are given volume of air, the greater the _____ of the air will be.
I need help with this. A container holds 30.0 mL of nitrogen at 45 degree Celsius. What will be its volume if the temperature increases to 65 degree Celsius?
Answer:
43.2
Explanation:
you use the charles law.
What is the primary difference between a molecule and a compound?
Answer:
Molecules are formed by two or more atoms that are bonded by chemical bondings. Compounds are constructed by two or more elements where the elements are mixed in fixed ratios. Not all molecules can be called compounds.
Explanation:
What is the MAXIMUM amount of the substance that will dissolve in 100 cm3 of water at 30OC?
A. 19 g
B. 30 g
C. 57 g
D. 125 g
Answer:
A 19g
Explanation: