Answer:
Option C
Explanation:
Avogadro number represent discrete unit of a substance which can be atom, molecule, ion etc.
In one mole of H2O there will be 6.02 x 1023 molecules and not atoms.
Molecule of H2O is the discrete unit of water mole and not atom.
Hence, option C is correct choice of answer
Differences in air temperature and pressure cause movements of air also known as ?
The half-life of the radioactive isotope polonium-218 is 3.05 minutes.
How long will it take for the activity of a sample of polonium-218 to decrease from 2.81E4 Ci to 3.52E3 Ci?
Answer: It will take 9.13 minutes for the sample.
Explanation:
Expression for rate law for first order kinetics is given by:
[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
where,
k = rate constant
t = age of sample
a = initial amount of the reactant = [tex]2.81\times 10^4[/tex]
a - x = amount left after decay process = [tex]3.52\times 10^3[/tex]
a) for completion of half life:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]
[tex]k=\frac{0.693}{3.05min}=0.227min^{-1}[/tex]
b) for activity to decrease from 2.81E4 Ci to 3.52E3 Ci:
[tex]t=\frac{2.303}{0.227}\log\frac{2.81\times 10^4}{3.52\times 10^3}[/tex]
[tex]t=9.13min[/tex]
Thus it will take 9.13 minutes for the sample.
[tex]t_{99.9}=40min[/tex]
The time after which 99.9% reactions gets completed is 40 minutes
Match each chemical reaction with the correct identifying type.
2 NaHCO3 (S )→ Na2CO3 (s) + H2O (g) + CO2 (g)
2 C8H18 (l) + 9 O2 (g) → 16 CO2 (g) + 18 H2O (g)
3 H2 (g) + N2 (g) → 2 NH3 (g)
Cu (s) + Ag2SO4 (aq) → 2 Ag (s) + CuSO4 (aq)
Pb(NO3)2 (aq) + 2 KI (aq) → PbI2 (s) + 2 KNO3 (aq)
Double Replacement Single Replacement Synthesis/Composition Decomposition Combustion
What is the subscript of Carbon in Isovaleric acid C5H10O2
When concentrated hydrochloric acid is added to a red solution containing the complex ion, the solution turns blue as the tetrahedral complex ion forms. Explain this color change.
Which change will cause more CO2 to form in a closed container?
Answer:
it would be E. because it would create steam from the h2o
Given the following unbalanced equation:
_____ CoCl2 + _____ F2 à _____ CoF2 + _____ Cl2
If you are given 11.84 mole of CoCl2, how many moles of CoF2 will be produced?
Answer:
11.84 moles
Explanation:
We first balance the chemical equation
[tex]CoCl_{2} + F_{2} ------> CoF_{2} + Cl_{2}[/tex]
Both number of elements in the reactant side is equal to elements on the product side thus this equation is already balanced
Using mole ratio to find moles of [tex]COF_{2}[/tex]
1 mole of CoCl2 reacts with 1 mole of F2 to produce 1 mole of CoF2 and ! mole of Cl2
Mole CoCl2 = Mole CoF2 = 11.84 moles
A 1.00 liter solution contains 0.31 M hydrocyanic acid and 0.40 M sodium cyanide. If 0.100 moles of barium hydroxide are added to this system, indicate whether the following statements are true or false. (Assume that the volume does not change upon the addition of barium hydroxide.)
a. The number of moles of HCN will remain the same.
b. The number of moles of CN will decrease.
c. The equilibrium concentration Of H3O+ will increase.
d. The pH will increase.
e. The ratio of [HCN]/ [CN-] will remain the same.
Explanation:
acid --> HCN
base --> KCN
now
another base NaOH is added
we know that
base will react with an acid
so
OH- + HCN ---> CN- + H20
we can see that
HCN is used up , so number of moles of HCN will decrease
CN- is being formed , so number of moles of CN- will increase.
A false
B false
C false
D true
E false
What is Trinitrogen hexaflouride formula
Answer:
N3F6
Explanation:
Tri- means three so three nitrogens and hexa- means six so six flourines.
Nitrogen and fluorine forms covalent compounds. The formula of one of their compound trinitrogen hexaflouride is N₃F₆.
What is covalent compounds?Covalent compounds are formed by the sharing of electrons between two atoms. Atoms which are electron deficient forms covalent compounds. The number of shared electron is based on the valency of each bonded atom.
Nitrogen is 7th element in periodic table and it have five valence electrons. Thus it needs 3 more electrons to attain stability. Fluorine is 9th element with 7 electrons in its valence shell and it needs one more electron to gain stability.
In the compound trinitrogen hexafluoride, there are three nitrogens and six fluorine. Each nitrogen shares one electron with fluorine and each fluorine in turn shares its one electron. Thus the formula of the compound is N₃F₆.
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Advantages and disadvantages of Reversible Fuel Cell..
Answer:
Hydrogen fuel cells do not produce any CO2 emissions during operation, even if their production is not necessarily carbon-free. This gives them an advantage over combustion engine vehicles, which can emit small amounts of poisonous carbon monoxide and require well-ventilated rooms for indoor use.
What is a combustion reaction?
Answer:
In a combustion reaction, a substance reacts with oxygen from the air. Combustion reactions happen at high temperatures, and transfer energy to the surroundings as light and heat. ... Since methane is made up of atoms of carbon and hydrogen, the products of its combustion reaction are oxides of carbon and hydrogen.
Explanation:
An object is travelling at a speed of 6500. cm per second. Convert the value to the following units (2.54 cm = 1 inch)
a. Kilometers per minute
b. Feet per hour
Answer:
3.900 km/min
7.677 × 10⁵ ft/h
Explanation:
Step 1: Given data
Speed of the object (s): 6500. cm/s
Step 2: Convert "s" to km/min
We will use the following conversion factors.
1 km = 10⁵ cm1 min = 60 s6500. cm/s × (1 km/10⁵ cm) × (60 s/1 min) = 3.900 km/min
Step 3: Convert "s" to ft/h
We will use the following conversion factors.
1 km = 3280.84 ft1 h = 60 min3.900 km/min × (3280.84 ft/1 km) × (60 min/1 h) = 7.677 × 10⁵ ft/h
Do you think the ingredients changing into a cake
in the oven are a chemical reaction? Explain why you
think baking a cake is or is not a chemical reaction.
what happens to the amount of energy in the air of ChristChurch and El nino years
Answer:
I t transfers from the ocean to the air, however the current is not as warm so less energy will transfer from the current to the air making ChrisstChurch cooler than usual.
what element is stored in the shells and skeltyons of living organisims?
Answer:
carbon
Explanation:
Many organisms use carbon to make calcium carbonate, a building material of shells and skeletons. Other chemical processes create calcium carbonate in the water. The using up of carbon by biological and chemical processes allows more carbon dioxide to enter the water from the atmosphere.
Why is an electron ejected when green light hits the metal?
Explanation:
If a large photon strikes the surface, that has enough strength to take out an electrode, which will then travel to the positive side since it is negative. Current is flowing at this stage. Since the reduced photons will be unable to distinguish between atoms, no power can pass.
A solution is made using 148.5 g of dimethyl ether (MM = 46.07 g/mol) and 90.0 g of methanol (MM = 32.04 g/mol). What is the mole fraction of the dimethyl ether in the solution?
Answer:
0.534
Explanation:
Mole fraction can be calculated using the formula:
Mole fraction = number of moles of solute ÷ number of moles of solvent and solute (solution).
In this question, solute is dimethyl ether while the solvent is methanol.
Mole (n) = mass (M) ÷ molar mass (MM)
Mole of solute (dimethyl ether) = 148.5 ÷ 46.07
= 3.22moles.
Mole of solvent (methanol) = 90 ÷ 32.04
= 2.81moles.
Total moles of solute and solvent = 3.22 + 2.81 = 6.03moles.
Mole fraction of dimethyl ether = number of moles of dimethyl ether ÷ number of moles of solution (dimethyl ether + methanol)
Mole fraction = 3.22/6.03
= 0.534
how do I solve this?
Answer:
Explanation:
When you divide exponentials, you subtract the powers. For the numbers infront, just use a basic calculator for.
7.95/6.02 = 1.32
10^22/10^23 = 10^-1
1.32 x 10^-1 is your answer
19E molar/molal Test
As of 2017, the tallest roller coaster in the world is the Kingda Ka, located at Six Flags Great Adventure in Jackson, New Jersey. It stands 139 meters tall and, at one point, the cars drop 127 meters! Roller coasters are a great way to investigate energy. Look at the diagram of a roller coaster below, and answer the following questions. At what point on the track does the car have the greatest potential energy?
Answer:
energy due to its velocity. We can compare potential and kinetic energy by considering a car on a hill. When the car is at the top of the hill it has the most potential energy.
how many moles are in 124.7 g of Ba(OH)2
Answer:
0.73 mol
Explanation:
No. of moles(n)= Given mass/molar mass.
Given mass=124.7g
Molar mass of Ba(OH)2= Molar mass of (Barium+2Oxygen+2Hydrogen)=137+32+2=171g
No. of moles= 124.7g/171g=0.73 mol
Single, double, or triple covalent bonds in a carbon atom are formed from A) inner shell electrons B) valence electrons. C) both inner shell and valence electrons.
Answer:
B) valence electrons.
Explanation:
Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.
For example, oxygen has a total number of eight (8) electrons while neon has total number of ten (10) electrons. Therefore, an atom of oxygen is able to gain (receive) two (2) more electrons in order to have the same electron arrangements as the noble gas i.e an atom of neon with an atomic number of 10.
Basically, each free electrons (valence electrons) produces a covalent bond.
Hence, single, double, or triple covalent bonds in a carbon atom are formed from valence electrons.
Single, double, or triple covalent bonds in a carbon atom are formed from Valency electrons.
The valency electron are the electrons found in the outermost shell of an
atom.
The valency electron of an atom determines the kind of bonding that exist in
an element .
Neutral Carbon atoms has 6 electrons . The number of valency electrons
(electrons in the outermost shell) in Carbon is 4 valency electrons.
So, carbon can form covalent bond by sharing electrons with other atom of
an element. The bonding maybe single, double or triple bonds .
This bonding are formed by the electrons in the outermost shell(valency electrons)
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What is the molecular formula of the product formed from the oxidation of 2-methyl-2,3-pentandiol with Jones reagent (CrO3, H , H2O)
Answer:
C6H12O2
Explanation:
The Jones reagent is a reagent in organic chemistry used to convert primary alcohols to carboxylic acids and secondary alcohols to ketones. Recall that tertiary alcohols can not be oxidized.
The compound 2-methyl-2,3-pentandiol contains one secondary and one tertiary alcohol. The secondary alcohol is oxidized to a ketone while the tertiary alcohol is not oxidized.
Hence the product of the oxidation using Jones reagent is 2-Hydroxy-2-methyl-3-pentanone with the molecular formula C6H12O2.
List five properties of the chair you are sitting on. Classify each as physical or chemical.
Answer:
Shapes suitable for humans to sit on it, three to four legs, a flat seat, and a back. Anything with such a shape is "chair", regardless of the peculiarities of its shape or its composition (what it is made of); anything without such a shape is a "not chair", even if you can sit on it. And a chair is classified as physical.
Explanation:
What type of mutation occurred?
Original: ATT CAC
Mutated: ATT TCA C
substitution (point)
insertion (addition)
deletion
Answer:
insertion (addition)
Explanation:
A T was added, making the sequence shift.
The infrared spectrum of the starting material (2-methylcyclohexanone) will have a peak present at ____________, which will be absent in the product (2-methylcyclohexanol).
Answer:
1710 cm^-1
Explanation:
The Infrared spectrum of the starting material will have a peak present at 1710 cm^-1. this is because
2-methylcyclohexanone has a ketone group (C=O) which will be reduced to an alcohol group (O-H), in the product i.e. (2-methylcyclohexanol). therefore the peak for the stretching vibration of the ketone carbonyl (C=O) is present only in the starting material only .and The peak for the stretching is at 1710 cm^-1
The total number of protons and neutrons in the nucleus of an atom is called the___________
Identify which trends in the diagrams below describe
atomic radius, ionization energy, electron affinity,
and electronegativity
Explanation:
the atmoc radius across the period
Atom radius as you move form left to right the atomic in the period table atomic radius decrease do to decrease the number of shell and it causes the Electron closed to nucleus. and also cause to decrease the inozation engey, electronegative andelectro affinity....... in the group the atomic radius increase as you move down the group do to increase number of shell because the Electron are far-away to the nuclear and it causes the small amount of energy to ionization so that the ionization engey , electronaffity and electronegative are increase1. Electricity is a form of energy created by the free or controlled
movement of charged particles such as electrons.
True
False
Answer:
true
Explanation:
how Is disaccharide is hydrolyzed into monosaccharides