Answer:
2.04 x 10⁻¹⁹J
Explanation:
Given parameters:
Frequency = 3.08 x 10¹⁴Hz
Unknown:
The energy of the photon = ?
Solution:
The energy of a photon is given as;
E = hf
Where h is the planck's constant
f is the frequency
Insert the parameters and solve;
E = 6.63 x 10⁻³⁴ x 3.08 x 10¹⁴
E = 20.4 x 10⁻³⁴⁺¹⁴
E = 20.4 x 10⁻²⁰ = 2.04 x 10⁻¹⁹J
Answer:
2.97*10-19 j
Explanation:
E=Energy of photon
H=Planck constant=6.626*10-34
V=Frequency of photon
we can plug what we already know E=(6.626*10-34)(4.48*10 14)
Where are most of the metals found on the periodic table
Answer:
Left
Explanation:
Metals are located on the left of the periodic table, and nonmetals are located on the upper right. They are separated by a diagonal band of semimetals.
Is this a model of an element, a compound, or a mixture? Explain your reasoning.
Answer:
A mixture.
Explanation:
The image contains two types of molecules: one with a blue centre and one with a green centre. They are both compounds, as they contain atoms of different elements that are chemically combined/ bonded to each other. As the molecules of the different compounds are not bonded to each other, the model must show a mixture.
A mixture: a combination of molecules of different elements and/or compounds that are not chemically combined e.g. salt dissolved in water.
An element: a substance containing only one kind of atom e.g. oxygen.
A compound: a substance containing two or more kinds of atoms (atoms of different elements) are chemically bonded to each other e.g. water.
In the model of an element, it represents a mixture. The correct option is b.
What is a mixture?A mixture is a non-chemically coupled combination of molecules from different elements and/or compounds, such as salt dissolved in water.
There are two kinds of molecules in the image: one with a blue center and one with a green center. They are both compounds because they contain atoms of different elements that have been chemically combined/bonded. Because the molecules of the various compounds are not bound to one another, the model must depict a mixture.
A compound is a substance that contains two or more types of atoms (atoms of different elements) that are chemically bound to one another, such as water.
Therefore, the model shows a mixture.
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plz help me the other was blurry I had to repost it
Answer:
HCN+CuSO4->H2SO4+Cu(CN)2
2,1,1,1
1.Add 2 to HCN it then becomes (H=2, C=2, N=2,) (had to add 2 cz on right side you had H2 in H2SO4)
2.1(nothing) cz on both sides we got 1Cu and 1SO4
3.1 cz again we have H2 on both sides and 1SO4 on both sides
4.1 cz we got 1Cu on both sides and 2C 2N on both sides (1st step)
An astronaut has a mass of 80kg how much mass does he weigh in Mars
Answer:
26.66kg
Explanation:
If a person has a mass of 80kg, then they will weigh 80kg x 9.8m/s^2 or 784 Newtons on the Earth. That same person would weigh 80kg x 9.8m/s^2/3 or 261.33 Newtons on Mars, which the person might think was 26.66 Kg (although he would be incorrect since his mass has not changed).
The energy associated with motion is
a. kinetic energy
b. elastic potential energy.
c. gravitational potential energy.
d. nuclear energy
Answer:
Kinetic Energy
Explanation:
The form of energy associated with the motion, position, or shape of an object is called mechanical energy. An object's mechanical energy is a combination of its potential energy and its kinetic energy. The basketball has both potential energy and kinetic energy.
As the vibration of molecules increases, the _____ of the substance increases.
temperature
internal energy
kinetic energy
all of the above
Answer:
Answer option D- all of the above
Question 15
4 pts
Using the equation:
HgO --> Hg + O2
If 7.543 grams of HgO decompose, how many grams of oxygen are formed?
Answer:
1.184 g
Explanation:
Which of the following planets has ammonia clouds in its atmosphere?
Jupiter
Mars
Mercury
Venus
Answer:
Jupiter and Saturn has ammonia clouds in its atmosphere since the molecules of ammonia gas that are present in their atmospheres condense to form clouds. However, these ammonia clouds are more visible in Jupiter than in Saturn because of their lower altitude in Saturn.
Answer:
A
Explanation:
i took the exam
Which characteristics of stars is affected by a star's temperature?
Answer:
Characteristics of stars is affected by a star's temperature is Color.
Explanation:
As the color of stars is completely dependent upon its own surface temperature. If the stars are cooler, then it turns red in color. If the stars are hotter, then it turns blue in color.
In lab, you measure out 24.25g of C2H4. How many atoms of H is this?
Answer:
anong sagot jan? d ko kasi alam ehhh penge sagot
Which process occurs in a fission nuclear reactor?
Nuclei combine.
Nuclei split apart.
Neutrons combine.
Neutrons split apart.
Answer:
Nuclear fission/ split apart
Explanation:The process of splitting a nucleus is called nuclear fission and is used in nuclear power reactors. Fission is another word for splitting.
Hope this helps! brainlyeast would only be necessary if this helped you thanks! :) have a good day!
Answer:
The correct answer is B. Nuclei split apart
Explanation:
EDGE2022
What happens to the atomic radius when an electron is gained?
O A. The negative ionic radius is larger than the neutral atomic radius.
O B. The negative ionic radius does not follow a trend with the neutral
radius.
O C. The negative ionic radius is smaller than the neutral atomic radius.
O D. The negative ionic radius is the same size as the neutral atomic
radius.
Answer: A. The negative ionic radius is larger than the neutral atomic radius.
Explanation: Did the test just now
Select the correct answer. What happens if you double the number of batteries used in a circuit? (Assume all of the batteries are the same.) ОА. . The current doubles only. O B. B. The voltage doubles only. O C. The current decreases. OD. The voltage decreases. O E. The voltage and current doubles.
Answer:
THE ANSWER IS "O E. The voltage and current doubles."
I IT HELPS YOU....
Answer:
They are both doubled, answer E
Explanation:
Common human behavior that seems to be programmed or directed by genes or hormones?
Answer:
There's a lot...lying...rolling eyes...aggression...mating...parenting...sadness...basically alot
Explanation:
Which force keeps planets in orbit around the Sun?
O A. Strong nuclear force
O B. Electric force
O C. Gravity
O D. Magnetic force
Answer: Gravity
Explanation:
A PE X
Which of the following is TRUE?
A. Lipids are fatty substances found in the blood.
B. Cholesterol is a type of lipid.
C. Triglycerides is a type of lipid.
D. All of the above
Answer:
The answer is D.
Explanation:
I learned about this last year. Its very simple if you let your parents or teachers explain it to you!
Answer:
All of the above
Explanation:
All the answers are correct. Lipids come in difference forms.
Into which layer of the Earth do plate boundaries extend?
outer core
lithosphere
lower mantle
asthenosphere
Answer:
lithosphere
Explanation:
I am big Brain
How many mL of 2M stock solution would I use to prepare 0.500 L of 0.1 M NaCl?
Answer:
25 mL
Explanation:
Step 1: Given data
Concentration of the concentrated solution (C₁): 2 MVolume of the concentrated solution (V₁): ?Concentration of the diluted solution (C₂): 0.1 MVolume of the diluted solution (V₂): 0.500 LStep 2: Calculate the volume of the concentrated NaCl solution
We will use the dilution rule.
C₁ × V₁ = C₂ × V₂
V₁ = C₂ × V₂ / C₁
V₁ = 0.1 M × 0.500 L / 2 M
V₁ = 0.025 L = 25 mL
Which of the following describes geothermal energy in use?
A
A drought in recent years has lowered the amount of hydroelectric power produced by the Hoover Dam.
B
The wide open land and strong gusts of the Greater Accra region in Ghana make it a perfect location for multiple turbines.
C
Iceland is situated on top of multiple volcanoes and harnesses this natural power to heat the roads and sidewalks in the winter.
D
Innovators are working to create panels to replace asphalt on highways, so roadways can generate energy from the sun even as cars burn fossil fuels.
The statement which describes geothermal energy in use is iceland is situated on top of multiple volcanoes and harnesses this natural power to heat the roads and sidewalks in the winter.
What is geothermal energy?Geothermal energy is the natural energy or we can say that renewable energy which can be used without any use of chemicals and damage of environment.
Geothermal energy is used for many purposes like hydroelectric energy, wind energy, solar energy, etc.
First and second options are not correct because in that utilization of geothermal is not mention.Iceland on the top of valconoes is used to warm up the roads and sidewalks in the winter season, this gives the importance of the geothermal energy.At the last option they are planning for the future utilization, so we will not consider that point for right now.Hence, iceland on top of volcanoes describe the use of geothermal energy.
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What is the freezing point of calcium?
Is calcium brittle?
Does calcium conduct electricity?
PLEASE IF YOU CAN HELP ME OUT AS SOON AS POSSIBLE IT WOULD BE MUCH APPRECIATED!!! THANK YOU!! :)
What is the enthalpy of reaction for the decomposition of calcium carbonate?
CaCO3(s) Right arrow. CaO(s) + CO2(g)
Answer:
Explanation:
You will need to look up the Standard Heats of Formation* for each substance and apply Hess's Law Equation.
ΔH⁰(rxn) = ∑ΔH⁰(Products) - ∑ΔH⁰(Reactants)
*Std Heats of Formation can be found in the appendix of most college chem texts.
For this problem:
Given CaCO₃(s) => CaO(s) + CO₂(g)
∑ΔH⁰: -635.1 Kj/mole -393.5Kj/mole -1206.9
ΔH⁰(rxn) = [(-393.5 Kj/mole) + (-393.5Kj/mole)] - (-1206.9Kj/mole)
= (-635.1 -393.5 + 1206.9) Kj/mole
= +178.3 Kj/mole
Answer:
656.3 kJ
This reaction is endothermic
Explanation:
edge 2020
6. Which of the following units would be MOST appropriate for measuring
the length of a car?*
1 poin
A. Millimeters
B. Centimeters
C. Meters
D. Kilometers
7. Which of the following units would be MOST appropriate for measuring
1 point
Answer:
Meter
Explanation:
What is the molar mass of an unknown gas with a density of 2.00 g/L at 1.00 atm and 25.0 °C?
Answer:
48.9 g/mol
Explanation:
n=(atm x v)/(.08206 x 298)
The molar mass of the gas 49.0 g/mol.
Given:
Unknown gas with a density of 2.00 g/L at 1.00 atm and 25.0 °C.
To find:
The molar mass of an unknown gas.
Solution:
The mass of gas = m
The volume of the gas =V
The molar mass of the gas = M
The density of the gas = d = 2.00 g/L
[tex]d=\frac{m}{V}[/tex]
The pressure of the gas = P
The temperature of the gas T = 25.0 °C = 25.0+273.15 K=298.15 K
The ideal gas equation:
[tex]PV=nRT\\\\PV=\frac{\text{Mass of gas(m)}}{\text{Molar mass of gas(M)}}RT\\\\PM=\frac{m}{V}RT \\\\PM=dRT\\\\1 atm\times M=2.00 g/L\times 0.0821 atm L/molK\times 298.15 K\\\\M=\frac{2.00 g/L\times 0.0821 atm L/molK\times 298.15 K}{1 atm}\\\\M=48.96 g/mol \approx 49.0 g/mol[/tex]
The molar mass of the gas 49.0 g/mol.
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Aspirin synthesis involves the addition of an acetyl group to salicylic acid in a condensation reaction with an alcohol. The acetyl group could be added with a carboxylic acid but the preferred procedure is to use the acid anhydride. Why is preferable to use an acid anhydride for ester formation with an alcohol rather than a carboxylic acid? Select one: Carboxylic acids react with water in an undesired side reaction. Acid anhydrides are generally easier and safer to handle than carboxylic acids. Carboxylic acids change the pH of the solution too much for the reaction to proceed. Acid anhydrides are less stable than esters so the equilibrium favors the ester product.
Answer:
The correct appropriate will be Option 1 (Acid anhydrides are less stable than esters so the equilibrium favors the ester product.)
Explanation:
Acid anhydride, instead of just a carboxyl group, is typically favored for esterification. The predominant theory would be that Anhydride acid is somewhat more volatile than acid. This is favored equilibrium changes more toward the right of the whole ester structure. Extremely responsive than carboxylic acid become acid anhydride as well as acyl chloride. Thus, for esterification, individuals were most favored.The other options offered are not relevant to something like the scenario presented. So, the solution here is just the right one.
Particles in a warmer block will have ________ kinetic energy and move ______than the particles in the colder block.
Question options:
more/faster
less/slower
less/faster
more/slower
Answer:
More and Faster
Particles in a warmer block will have more kinetic energy and move faster than the particles in the colder block.
What is kinetic energy?
Kinetic energy is defined as a form of energy that an object or particle has by the reason of its movement.
It is also defined as the measure of the work that an object does by the virtue of its motion.
Kinetic energy can be expressed as
KE = 1/2mv²
Kinetic energy is produced when potential energy is released, triggered into motion by gravity, or chemical reaction among other crystals.
Thus, particles in a warmer block will have more kinetic energy and move faster than the particles in the colder block.
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How many grams of potassium sulfate should be weighed to prepare 100 ppm of potassium in 250mL of solution if the purity of the salt is 98.7%?
Answer:
R=0.0564g K2SO4
Stereoisomers share the same connectivity and differ only in the way their atoms are arranged in space. Draw the structure of a compound that is a stereoisomer of trans-1,2-dibromocyclobutane.(Note that the question asks for a different stereoisomer of the named compound and not the named compound itself.)Use the wedge/hash bond tools to indicate stereochemistry.Show stereochemistry in a meso compound.In cases where there is more than one answer, just draw one. (use same instructions below)
1b) Draw the structure of a compound that is a stereoisomer of cis-1,2-dimethylcyclopentane.1c) Draw the structure of a compound that is a stereoisomer of cis-1,2-dimethylcyclobutane.
Answer:
Explanation:
A stereoisomer refers to an isomer that shares an identical bonding structure but differs in the geometric position of functional groups and atoms.
Stereoisomers are molecules which have the same semi-expanded formula, but a different arrangement in space.
They are isomers with a similar structural formula, yet which contrast just in their spatial geometry.
From the given question, we are provided with some set of instructions to draw the structure of the following compounds.
stereoisomer of trans-1,2-dibromocyclobutane
cis-1,2-dimethylcyclopentane
cis-1,2-dimethylcyclobutane
The diagram for each compound given can be seen in the attached file below.
which metal is most likely to form more than one kind of positively charged ion
Answer:
metal atoms lose electrons to form positivity charged ions. non metal atoms gain electrons to form negatively charged ions
The two most common isotopes of argon (Ar) are argon-36 and argon-40. Given that the average atomic mass is 39.95, what can be said about the relative abundance of each isotope? Which is more common and how do you know? No calculation is necessary. I am looking for a simple written response.
Answer:
Argon-40
the reason this is abundent is because this is a more common isotope
Explanation:
The reversible reaction, 2NO{g) ⇌ N2 (g) + O2 (g), would be classified as a __________________ reaction.
homogeneous
heterogeneous
endothermic
