Answer:
D
Explanation:
k.E= ½mv²
= ½×2×10²
=100
Fireworks explode above your
head. Is this exothermic or
endothermic and why?
substance in which two or more atoms are bonded together.
molecule(s)
two or more atoms touching means they are connected as molecules which also make up compounds
Which of these solutions are basic at 25 °C? Solution A: [OH−]=3.13×10−7 M Solution C: [H3O+]=0.000747 M Solution B: [H3O+]=9.55×10−9 M
Answer:
Are basic:
[OH⁻] = 3.13x10⁻⁷M and [H₃O⁺] = 9.55x10⁻⁹M
Explanation:
A solution is basic when pH = - log [H₃O⁺] is higher than 7.
It is possible to convert [OH⁻] to [H₃O⁺] using:
[H₃O⁺] = 1x10⁻¹⁴ / [OH⁻]
a. [OH⁻] = 3.13x10⁻⁷M
[H₃O⁺] = 1x10⁻¹⁴ / [3.13x10⁻⁷M]
[H₃O⁺] = 3.19x10⁻⁸M
pH = - log [H₃O⁺] = 7.50
[OH⁻] = 3.13x10⁻⁷M is basic
b. pH = -log [H₃O⁺] = - log 0.000747M = 3.13.
This solution is not basic
c. [H₃O⁺] = 9.55x10⁻⁹M
pH = 8.02
This solution is also basic.
The diagram shows currents that form as water is heated. Which would most likely contain this same type of current? the air above a wildfire a carton of milk in a refrigerator a snowdrift on a shady mountainside a boulder in a hot desert
Answer:
the answer is A
Explanation:
edg 2020
Answer:
the air above a wildfire/A
Explanation:
Why is k+ much more stable than k2+?
which color???????
please help
Answer:violet
Explanation:Even though violet waves have the shortest wavelength of the visible light spectrum, they carry the most energy.
g Lactate dehydrogenase is a tetrameric enzyme (144kDa) that catalyzes conversion of pyruvate into lactate to regenerate NAD in oxygen depleted muscles. a) Why in anaerobic conditions, is NADH oxidized by lactate dehydrogenase
Answer:
Kindly check the explanation.
Explanation:
NADH is oxidized anaerobic conditions by lactate dehydrogenase because in order to transform or change Pyruvate into Lactate it has to happen in an anaerobic condition that is where we hardly find oxygen(in the presence of no oxygen).
The chemical compound or say the enzyme known as lactate dehydrogenase gets its proton from NADH( in a REDOX type reaction). After getting the proton from NADH, it uses that to convert Pyruvate into Lactate.
NB: the conversion can also be done in aerobic condition but more ATP will be produced. With anaerobic condition, less ATO is produced and there is re-oxidation.
Write the nuclear symbols for carbon-12, carbon-13and carbon - 14 .
The nuclear symbols for carbon-12,carbon-13 , carbon-14 are ¹²₆C,¹³₆C,¹⁴₆C respectively as they are the isotopes of carbon.
What are isotopes?Isotopes are defined as substances having same number of protons but different number of neutrons.Number of protons is characteristic for determining position of elements in the periodic table.
Since,all isotopes have the same number of protons and hence have same position.They have similar chemical properties as they have same number of electrons.
They find applications in the field of nuclear medicine and oil and gas research . There are 2 types of isotopes : stable and unstable.Unstable isotopes are radioactive and are called as radioisotopes.Some of these isotopes are man -made and hence also called as artificial isotopes.Every element has an isotope which is either man-made or natural .
Many properties of isotopes depend on mass which is measured in atomic mass unit. The difference in actual mass and mass number is called mass defect.
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List the following atoms in order of increasing electronegativity: O, AI, Ca
Answer:
CA, AI, O
Explanation:
Look at a periodic table and locate each element. Note their electronegativity levels.
A student pushes a heavy lab table that weighs 400N for 15m across a room. How much work was done?
Answer:
The answer is 6000 NExplanation:
The work done by an object can be found by using the formula
workdone = force × distance
From the question we have
workdone = 400 × 15
We have the final answer as
6000 NHope this helps you
please helppp
which one??????????
How many grams of Fe can be produced when 6.50 g of Fe2O3 reacts?
Answer:
Mass of Fe produced = 4.468 g
Explanation:
Given data:
Mass of Fe produced = ?
Mass of Fe₂O₃ react = 6.50 g
Solution:
Chemical equation:
2Fe₂O₃ → 4Fe + 3O₂
Number of moles of Fe₂O₃ ;
Number of moles = mass/molar mass
Number of moles = 6.50 g/159.69 g/mol
Number of moles = 0.04 mol
Now we will compare the moles of iron and ironoxide.
Fe₂O₃ : Fe
2 : 4
0.04 : 4/2×0.04 = 0.08 mol
Mass of iron produced:
Mass = number of moles × molar mass
Mass = 0.08 mol × 55.85 g/mol
Mass = 4.468 g
Two moles of acetyl chloride was mixed with two moles of dimethylamine. After the reaction is complete, what species can be found in the mixture
Answer:
See explanation
Explanation:
The reaction is shown in the image attached. This reaction occurs by a carbocation (ionic) mechanism.
The lone pair on the nitrogen atom attacks the carbocation leading to the formation of the product as shown in the image attached.
Since the reaction occurs in a 1:1 ratio, two moles of reactants yields two moles of product.
Polonium crystallizes in a simple cubic unit cell with an edge length of 3.36 Å.
a. What is the mass of the unit cell?
b. What is the volume of the unit cell?
c. What is the density of polonium?
a. The unit cell is the smallest group of atom which have overall symmetry of a crystal, and from which is the entire letters can be buled built up by repetition in 3 dimensions.
b. The volume(v) of the unit cell is equal to the cell edge length (a)cubed.
c. density of polonium is 9.32g/cm3.
What is the concentration (M) of CH3OH in a solution prepared by dissolving 34.4 g of CH3OH in sufficient water to give exactly 230 mL of solution
Answer:
4.67M
Explanation:
The concentration of methanol (CH3OH) can be calculated using the following:
Molarity (M) = number of moles(n)/volume(v)
However, mole is not given. It can be obtained by using:
Mole = mass / molar mass
Where; mass = 34.4g
Molar mass (MM) of CH3OH is:
= 12 + 1(3) + 16 + 1
= 12 + 3 + 17
= 32g/mol
mole = 34.4/32
mole = 1.075mol
The volume needs to be converted to L by dividing by 1000
230mL = 230/1000
= 0.230L
Molarity = mol/volume
Molarity = 1.075/0.230
Molarity = 4.6739
Molarity = 4.67M
The concentration of CH3OH in solution is 4.67M
The greatest absorbance occurs when the solution and beam color are the ______ because the solution color appearance is the color being ___________ by the solution.
Answer:
Same
Absorbed
Explanation:
When you are dealing with solutions the best way to tell that something has been absorbed is when the solution and the beam color are the same, since they have the same color you can be sure that the color has been absorbed properly and the greatest absorbance has occured.
The fill in the blanks should be filled with the same and absorbed.
The following information should be considered:
At the time when you deal with the solutions, the best way is that something should be absorbed at the time when the solution & beam color should be similar. As it contains the similar color so the color should been absorbed properly & the highest absorbance should be arise.Therefore we can conclude that the fill in the blanks should be filled with the same and absorbed.
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Plzzzz answer quick
An excited electron of hydrogen emits the least energy when it drops from 1 point
quantum levels *
Level 4 to level 2
level 5 to level 1
level 2 to level 1
O level 2 to level 5
Answer:
sorry to do this but I really needed some points to ask my question from someone else so that's why I am doing so really sorry and thank you for free points
The number of atoms of any element in the given chemical formula is the number that is written on the foot of the symbol of that element. Therefore, the correct option is option C.
What is atom?Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound.
Atom consists of electron, proton and neutron. The total mass of atom is inside the nucleus. Inside the nucleus proton and neutron is there. So calculate mass of an atom, total mass of all protons is added to the total mass of neutron. Electrons revolve around the nucleus.
If an electron of hydrogen gets excited and drops from energy level 2 to level 1 to release least energy. The level shows the energy levels.
Therefore, the correct option is option C.
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Hello I was wondering if anyone knew how to draw the molecular geometry of fentanyl. I already did the Lewis structure.
Answer:
i dont
Explanation:
How many milliliters of a 0.900% (m/v) normal saline solution can be prepared from 3.50 g of sodium chloride, NaCl
Answer:
389 mL solution
Explanation:
Step 1: Given data
Concentration of the NaCl solution: 0.900% (m/v)Mass of sodium chloride: 3.50 gVolume of saline solution: ?Step 2: Calculate the volume of saline solution
The concentration of the NaCl solution is 0.900% (m/v), that is, there are 0.900 g of NaCl every 100 mL of solution.
3.50 g NaCl × 100 mL solution/0.900 g NaCl = 389 mL solution
A solution is a special type of homogeneous mixture composed of two or more substances. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent
The definition of the solute and solvent is:-
Solute- A component that is less in solutionSolvent - A component that is more in solutionThe data given in the NaCl solution is: 0.900% (m/v)
Mass of sodium chloride: 3.50 g
Volume of saline solution: ?
The concentration of the NaCl solution is 0.900% (m/v), that is, there is 0.900 g of NaCl every 100 mL of solution.
[tex]\frac{3.50 * 100}{0.900} = 389 mL solution[/tex]
Hence, 389ml is required.
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A mixture of 40 mol % isopropanol in water is distilled at 1 atm by differential distillation until 70 mol % of the charge has been vaporized (equilibrium data are given in Exercise 7.33). What is the composition of the liquid residue in the still pot and of the collected distillate
Answer:
Explanation:
From the given information:
The percentage wieght of mixture [tex]x_w[/tex] = 0.4
The distillate = 70
From equilibrium data in Exercise 7.33
The Feed W = 100
The Liquid residue F = Feed(W) - Distillate (D)
= 100 - 70 = 30
By applying rayleigh equation;
[tex]In \bigg (\dfrac{F}{W}\bigg)= \int^{xF}_{x_w}\dfrac{1}{y-x} \ dx[/tex]
From the plot of the graph of [tex]\dfrac{1}{y-x} \ vs \ x[/tex]; the area under the curve is being calculated between the point {[tex]x_1 = 0.4 \ and \ x_2[/tex] }.
Such that; the area [tex]= In \bigg( \dfrac{100}{30}\bigg)[/tex] = 1.209
Similarly, the value of xF = 0.067
∴
[tex]y_D = \dfrac{F_{xF} - W_{xW}}{D}[/tex]
[tex]y_D = \dfrac{30(0.067)-100(0.4)}{70}[/tex]
[tex]y_D = 0.543[/tex]
A 7-kg bowling ball is rolled down a lane while a 10-kg cart remains at rest. Which has the greatest inertia?
Im sorry but I have the same question tell me when you figure it out please
Type in the name of the following compounds. Be sure to use the periodic table if needed.
the answer is Sulfur dioxide
Answer:
Sulfur Dioxide
Explanation:
hope this helps:)
what can chemically be broken down into a simpler substance
Answer: ea sports
Explanation:
A compound is a substance that contains two or more elements chemically combined in a fixed proportion. However, it is not an element because it can be broken down into simpler substances – carbon and hydrogen. ... Recall that the components of a mixture can be separated from one another by physical means.
What evidence should Mitchell collect to BEST support the second law of thermodynamics?
Answer:
The Second Law of Thermodynamics poses an insurmountable problem for ... More time will make things worse for the Darwinist, not better. ... error fail-safe and proof-reading devices utilized for quality control, assembly ... No one really supports the idea that the sun + non life = life
Explanation:
According to the second law of thermodynamics, the energy of the universe is conserved but the entropy of the universe is continuously increasing.
What is the second law of thermodynamics?The second law of thermodynamics put some restrictions on the direction of heat transfer and attainable efficiencies of heat engines. This law stated that any spontaneously happening process will lead to an escalation in the entropy (S) of the universe.
This law explains that the entropy of an isolated system will never decrease with time. Mathematically, the 2nd law of thermodynamics:
ΔS (universe) > 0
where ΔS of the universe is the change in the entropy of the universe.
The second law of thermodynamics provides the criterion for the feasibility of any physical or chemical process. A physical or chemical process cannot take place unless it must follow both the 1st and 2nd laws of thermodynamics.
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bi-S is relatively more stable than bi-n bond. give reasons for the HSAB concept
Answer:
xhhhvxhxgjhgogftsvicsdgfsytdhdrrygyfhd
Explanation:
ywwgzwu9wu9wsussg the the
The specific heat of ethanol (C2H5OH) is 2.46 J/g ° C. What is the heat capacity of 1.00 kg of ethanol?
Answer:
The total heat required is 4088.6 J
Explanation:
We have three processes which involve heat absorption. We have to calculate the heat of each process and then to calculate the total heat.
1- liquid ethanol is heated from 25ºC (298 K) to the boiling point 78.5ºc (351.5 K). We use specifi heat of liquid ethanol to calculate the heat absorbed in this part:
H1= m x Sh x ΔT
H1= m x Sh x (Tfinal - Tinitial)
H1= 3.95 g x 2.45 J/g.K x (351.5 K -298 K)
H1= 517.7 JExplanation:
A 0.40 g sample of sodium salicylate was dissolved and diluted to a final volume of 250 mL with deionized water. What is the concentration of this solution
Answer:
9.99x10-3
will this help mate?
PART A: Which of the following identifies the central idea of the text? The text is the power of advertising
A. While many people consider advertisements to be annoying, they provide the public with necessary information and services.
B. Advertisement are capable of manipulating people more than they realize, as ads convince consumers that certain products lead to specific emotions and experiences.
C. With the development of technology, advertisements have become more informative and able to cater to specific viewers.
D. Advertisements tend to focus their message on youth, as they are most likely to spend money on trendy products.
Answer: B
Explanation:
Answer: B- Advertising are capable of manipulating...
Explanation:
Describe how simple distillation is used to separate water from an aqueous solution of sodium
sulfate.
Answer:
hbyiy
Explanation:
Most of Earth's atmosphere is made up of nitrogen gas. Nitrogen can also
exist as a solid, liquid, or plasma. Four samples of nitrogen are each in a
different state but have the same mass. Which statement about the relative
amounts of thermal energy in the samples is true?
O A. The sample of solid has more energy than the sample of gas.
B. The sample of liquid has more energy than the sample of solid.
C. The sample of plasma has less energy than the sample of gas.
D. The sample of liquid has less energy than the sample of solid.
The sample of the liquid has more energy than the sample of solid. Hence, option B is correct.
What is thermal energy?Thermal energy refers to the energy contained within a system that is responsible for its temperature.
The particles in the liquid are the same as in the solid but they have more energy. To melt solid energy is required to overcome the attraction between the particles and allow them to pull them apart. The energy is provided when the solid is heated up.
Hence, option B is correct.
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