Can Light from the light bulb cause skin cancer? Please explain why or why not? with the evidence? I need an answer till 12:00 otherwise I will not make you brqinliest.
Answers
Answer:Yes yes it can
Explanation:Why ? Because Stony Brook University in New York found that CFL bulbs produce incredibly high levels of UVA and UVC emissions, which are harmful to human skin.
Related Questions
Which element is classified as a
metalloid?
a.
Boron
b. Potassium
C.
Sulfur
d. Xenon
Answers
Answer: Boron
Explanation:
what is the most effective method of for increasing the rate of evaporation of a given amount of water
Answers
The most effective method of for increasing the rate of evaporation Only so much water vapour can be contained in air. You will ultimately hit the condensation point if you keep adding more. The airborne water vapour transforms back into liquid at this point.
The temperature of the air affects this location. In comparison to cooler air, warmer air will store more water vapour. Therefore, warm air above the water would be helpful if you wanted to speed up evaporation.Simply put, we refer to the water vapour in the air as humidity. The percentage of water vapour in the air over the air's maximal vapor-holding capacity is known as relative humidity. As a result, if the air is only carrying half of the water vapour.
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If you have 48 ounces of eggs, how many dozens of eggs do you have?
Answers
During today's lab, hydrochloric acid is used to: (select all that apply)
A)Neutralize any grignard reagent still present in the reaction
B) Neutralize the THF
C) Convert the remaining magnesium into dye
D) Convert the alkoxide to the alcohol, and then allow it to eliminate, forming the dye
Answers
The correct option is D) Convert the alkoxide to the alcohol, and then allow it to eliminate, forming the dye.
What function does the play in the Grignard reaction?Hydrochloric acid must be added in order to dissolve any remaining Grignard reagent and transform the magnesium alcoholate into alcohol. The dimethylamino group would also be protonated if the pH level was too low, making the end product far more water soluble.
What is the purpose of a Grignard reagent?It is possible to count the halogen atoms in a halogen compound using Grignard reagents. For the chemical examination of several triacylglycerols as well as numerous cross-coupling reactions for the synthesis of various carbon-carbon and carbon-heteroatom linkages, Grignard degradation is employed.
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Choose 1
- concentrations
- temperatures - compounds
Choose 2
- higher masses - lower temperatures
- lower concentrations
Choose 3
- a table
- a plot
- a spectrophotometer
To calculate the Ksp value in the presence of ion activity, it is necessary to measure the ion product at the point of saturation for multiple (Choose 1). The ion product nears the Ksp value at (Choose 2) due to lower ionic strength and (Choose 3) is finally used to determine the Ksp Value.
Answers
To calculate the Ksp value in the presence of ion activity, it is necessary to measure the ion product at the point of saturation for multiple compounds. The ion product nears the Ksp value at lower concentrations due to lower ionic strength and temperatures. A spectrophotometer is finally used to determine the Ksp Value.
The Ksp value is a measure of the solubility of a compound, and it can be calculated using the ion product constant equation. However, in the presence of ion activity, the measured ion product may deviate from the theoretical value, and so multiple measurements are necessary to determine the correct Ksp value.
At higher concentrations, the ionic strength of the solution increases, which can lead to changes in the ion activity and deviations from the theoretical Ksp value. However, at lower concentrations, the ionic strength is lower, and so the ion activity more closely approximates the theoretical value. Additionally, at lower temperatures, the solubility of the compound decreases, which further helps to reduce the deviation from the theoretical Ksp value.
A spectrophotometer can be used to measure the concentration of ions in solution, and so it can be used to determine the ion product at the point of saturation for multiple compounds. This information can then be used to calculate the Ksp value for each compound.
Step by step explanation:
1. Measure the ion product at the point of saturation for multiple compounds using a spectrophotometer.
2. Determine the concentration of each ion in solution.
3. Use the ion product constant equation to calculate the Ksp value for each compound.
4. Compare the calculated Ksp values to the theoretical values to assess the accuracy of the measurements.
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1. A potassium atom has a larger atomic radius than a sodium atom. What statement about potassium correctly explains this difference?
A) It has a larger nuclear charge
B) It has a lower electronegativity
C) It has more energy levels occupied by electrons
D) It has a lower ionization energy
2. Which of the following elements has the greatest electron affinity (largest negative value)?
A) Mg
B) Al
C) Si
D) P
E) S
3. The electron affinity of fluorine is essentially equal to
A) The negative of the ionization energy F
B) The ionization energy F-
C) The negative of the ionization energy F-
D) The ionization energy Ne
E) The negative of the ionization energy Ne
Answers
The electron affinity is the energy required to remove an electron from an atom to yield a negative ion.
We know that atomic size increases down the group as more shells are added. This is because, inter-electronic repulsion pushes the electrons in the outermost shell farther away from the nucleus. Hence potassium atom has a larger atomic radius than a sodium atom because It has more energy levels occupied by electrons.
Electron affinity increases across the period. The more nonmetallic an element is, the more negative its electron affinity. Hence, sulfur has the greatest electron affinity.
Electron affinity is the opposite of ionization energy. It therefore follows that, the electron affinity of fluorine is essentially equal to the negative of the ionization energy F.
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Is my answer correct?
Answers
Yes the ANSWER is Correct-
On first half life the mass will be 10 gram
On second half life the mass will be 5 gram
On third half life the mass will be 2.5 gram
please help asap!! will give brainliest if right.
A student listed the characteristics of chemical and nuclear reactions.
Chemical and Nuclear Reactions:
X - Changes the identity of the element
Y - Does not change the identity of the element
Which of these statements best explains the identity of Reaction X?
It is a nuclear reaction because the identity of elements changes when there is a change in the number of protons and neutrons.
It is a chemical reaction because the identity of elements change when there is a change in the mass of the atoms involved.
It is a chemical reaction because the identity of elements change when there is a change in the overall energy of the system.
It is a nuclear reaction because the identity of elements change when there is a change in the number of outermost electrons.
Answers
Answer:
1st answer is right
Explanation:
nuclear reaction takes place when number of proton or neutron changes in a nucleus forming new products
for eg uranium goes nuclear reaction and gives thorium
Answer:
It is a nuclear reaction because the identity of elements changes when there is a change in the number of protons and neutrons.
Explanation:
the other guy needs a brainliest
ketoses such as fructose are expected to give a positive tollens test because:
Answers
Ketoses such as fructose are expected to give a positive Tollens test because of their ability to reduce Tollens' reagent.
What is the Tollens Test?The Tollens test is a chemical reaction used to test for the presence of aldehydes. The test is named after the German chemist Bernhard Tollens. The Tollens reagent is a solution of ammoniacal silver nitrate, Ag(NH3)2NO3. The test is based on the fact that aldehydes are readily oxidized to carboxylic acids by a solution of silver nitrate in ammonia.
This reaction is exothermic and produces a silver mirror on the inside of the test tube.The test solution is prepared by adding a few drops of a solution of Tollens' reagent to the substance being tested. The test solution is then heated in a water bath for a few minutes.
If the substance being tested is an aldehyde, it will reduce the silver ions in the Tollens' reagent to metallic silver. The metallic silver will form a mirror on the inside of the test tube. If the substance being tested is not an aldehyde, no mirror will form.The aldehydes are more easily oxidized than the ketoses.
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a student dissolved 4.00 g of co(no3)2 in enough water to make 100. ml of stock solution. he took 4.00 ml of the stock solution and then diluted it with water to give 275. ml of a final solution. how many grams of no3- ion are in the final solution?a student dissolved 4.00 g of co(no3)2 in enough water to make 100. ml of stock solution. he took 4.00 ml of the stock solution and then diluted it with water to give 275. ml of a final solution. how many grams of no3- ion are in the final solution?0.108 g0.0197 g0.0542 g0.0394 g
Answers
As per the given question, the mass of NO3-ion in the final solution is approximately 0.011 g or 0.0542 g (rounded to four decimal places). Hence, the correct option is 0.0542 g.
Given that a student dissolved 4.00 g of Co(NO3)2 in enough water to make 100 mL of stock solution, He took 4.00 m
L of the stock solution and then diluted it with water to give 275. m
of a final solution.
The molar mass of Co(NO3)2 = 165 g/mol
The molar mass of NO3- = 62 g/mol
The molarity of the stock solution = (4.00 g / 165 g/mol) / (100. mL / 1000 mL/L)
= 0.0242 M
We can use the equation; M1V1 = M2V2 where,
M1 is the initial molarity of the solution,
V1 is the initial volume of the solution,
M2 is the final molarity of the solution, and
V2 is the final volume of the solution.
Substituting the values in the above equation,0.0242 M × 4.00 mL
= M2 × 275 mLM2
= 0.000331 The MNO3- ion, Co(NO3)2, dissociates into Co2+ and NO3-. The number of NO3-ions produced is equal to the number of Co(NO3)2 molecules dissociated, which is 12.
Therefore, the concentration of NO3- ion is 2 × 0.000331 M
= 0.000662 M.
The mass of the NO3 ion in the final solution can be calculated as follows:
Mass of NO3- ion = concentration of NO3- ion × volume of the final solution × molar mass of NO3- ion
= 0.000662 M × 275 mL × 62 g/mol
= 11.22 g
≈ 0.0112 g
≈ 0.011 g
Therefore, the mass of NO3-ion in the final solution is approximately 0.011 g or 0.0542 g (rounded to four decimal places). Hence, the correct option is 0.0542 g.
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What causes warm air to rise?
a. The fact that it's less dense than cold air.
b. The fact that it weighs more than cold air.
c. The fact that it has higher pressure than cold air.
d. The fact that it's more dense than cold air.
Answers
6) What is the vapor pressure of water at 100°C?
Answers
Answer: The vapor pressure of pure water at 100°C is 760mm of Hg.
Explanation: We know tat 100 degree Celsius the water will convert into gas phase. At boiling point the vapor pressure of any liquid is 1 atmosphere and if we boil the water at 100° Celsius it means 1 atmosphere . So, 1 atmosphere = 760mm of Hg.
PLEASEEEE HELPPPPP!!
Answers
Answer:
Its the first one
Explanation:
4 mol is the highest of the Bunch and 4.0L is the lowest making the first answer the correct one
Solid potassium chloride is obtained by the reaction of solid potassium and chlorine gas.
Write a balanced chemical equation for this reaction.
Answers
Answer:
2 K(s) + Cl₂ (g) --> 2 KCl(s)
Explanation:
Potassium will just be K
Chlorine gas is part of BrIClHOF, which are diatomic gasses. So Cl₂
Looking at the periodic table potassium K has an ion charge of +1 and chlorine Cl has an ion charge of -1, so in a balanced compound they will be written as KCl
Balancing the amounts of each will lead to 2 K(s) + Cl₂ (g) --> 2 KCl(s)
What are water and carbon dioxide in the cellular respiration reaction? They are reactants because they are present before the reaction. They are reactants because they are present after the reaction. They are products because they are present before the reaction. They are products because they are present after the reaction.
Answers
Answer:
They are products because they are present after the reaction.
Explanation:
A chemical reaction refers to any interaction between two or more chemical species that leads to the formation of new chemical species. The species that interacted with each other are called reactants. They were present before the reaction commenced. The species that were formed after the interaction are called products. They only appear after the reaction.
In cellular respiration, carbon dioxide and water appear after the chemical reactions that take place, hence they are products.
Answer:
They are products because they are present after the reaction.
Explanation:
If the elements W, X, Y, and Z have electronegativity values of 1.0, 2.0, 2.5, and 3.5, respectively, which bond is the least polar
Answers
Answer:
XY bond is the least polar
Explanation:
Given
\(W = 1.0\)
\(X = 2.0\)
\(Y = 2.5\)
\(Z = 3.5\)
Required
The least polar bond
First, we calculate the difference in the electronegativities
\(WX = X - W\)
\(WX = 2.0 - 1.0\)
\(WX = 1.0\)
\(WY = Y - W\)
\(WY =2.5 - 1.0\)
\(WY =1.5\)
\(WZ =Z-W\)
\(WZ =3.5 - 1.0\)
\(WZ =2.5\)
\(XY = Y -X\)
\(XY = 2.5 -2.0\)
\(XY = 0.5\)
\(XZ = Z -X\)
\(XZ = 3.5 -2.0\)
\(XZ = 1.5\)
\(YZ = Z - Y\)
\(YZ = 3.5 - 2.5\)
\(YZ = 1.0\)
The least of the above calculations will be the least polar.
Hence, XY is the least polar
If you have a graduated cylinder containing 15.50 mL of water and this volume changes to 17.97 mL after a metal with a mass of 17.95 g is dropped into the graduated cylinder, then what is the density of this metal?
Answers
Answer:
Explanation:
density = mass / volume
mass = 17.95 grams
volume = 17.97 - 15.50 mL = 2.45 mL = 2.45 cc
density = 17.95 /(2.45) = 7.327 grams / cc
The correct tool for measuring mass is ...
A. electronic balance.
B. ruler.
C. water displacement.
D. graduated cylinder.
Answers
Answer:
electronic balance
it should be electronic balance
A specialty food store received orders for 725 fruit baskets during the 7-day period leading up to a major holiday. According to the fruit basket recipe shown, how many strawberries will the specialty store need to fulfill all 725 orders? 1 fruit basket = 4 oranges (O) + 3 apples (A) + 2 pears (P) + 6 strawberries (S) 1 fruit basket = 4O + 3A + 2P +6S ⟶ O4A3P2S6
Answers
The fruit basket recipe will the specialty store need to fulfill all 725 orders is 120 strawberries.
What is fruit basket?Fruit basket is defined as a gift basket filled with a variety of fruits.
A fruit basket can be called as a punnet is a compact box or square basket used for gathering, transporting, and selling fruits and vegetables, typically for small berries.
As one basket has 6 strawberries.
So, for completing 725 order we need
= 725 / 6
= 120.8 = 120 strawberries
Thus, the fruit basket recipe will the specialty store need to fulfill all 725 orders is 120 strawberries.
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The valve of a 2.0-L cylinder containing 2.0 moles of a gas at 2.0 atm and 24.3 K is opened, allowing 0.5 moles to escape into a 3.0-L vacuum chamber at 298 K. What is the final pressure of the gas in the second chamber?
0.245 atm
0.245 atm
4.09 atm
4.09 atm
16.3 atm
16.3 atm
24.5 atm
Answers
The final pressure of the gas in the second chamber is 0.623 atm.
To solve this problem, we can use the ideal gas law:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.
First, let's find the initial pressure of the gas in the 2.0-L cylinder:
PV = nRT
P(2.0 L) = (2.0 mol)(0.0821 L·atm/mol·K)(24.3 K)
P = 19.9 atm
Next, let's find the final number of moles of gas in the two chambers:
Initial moles - moles escaped = final moles
2.0 mol - 0.5 mol = 1.5 mol
Now, we can use the combined gas law to find the final pressure of the gas in the second chamber:
(P1V1)/T1 = (P2V2)/T2
We know that the initial temperature and volume of the gas are the same in both chambers, so we can simplify the equation to:
P1 = (P2V2)/V1
Plugging in the values we know:
P1 = (1.5 mol)(0.0821 L·atm/mol·K)(298 K)/(3.0 L)
P1 = 0.623 atm
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what is diffusion ,??
Answers
Diffusion is the net movement of anything generally from a region of higher concentration to a region of lower concentration. Diffusion is driven by a gradient in Gibbs free energy or chemical potential.
pleaseee help haha im timed
Answers
Answer: aerobic respiration converts about 40% of the available energy of glucose into ATP!!!
Write three sentences about The Amazing Life of Sand
HELP ASAP PLS
Answers
Answer:“If we’ve covered all of the potential sources, and we know the unique signature of the sand from these different sources, and we find it on a beach somewhere, then we basically know where it came from,” explained Barnard.
Explanation:
one year, a herd of cattle released 8.44 metric tons of ch4 (methane) into the atmosphere. how many metric tons of carbon did this methane contain?
Answers
This herd of cattle released 8.44 metric tons of methane (CH4) into the atmosphere. Methane is composed of one atom of carbon and four atoms of hydrogen, so this 8.44 metric tons of methane contained (8,440 kg) x (12.01/16.05) g/kg = 6,309 kg (6.31 metric tons).
To answer the given question, we need to know the molecular formula of methane, which is CH4. The atomic mass of carbon is 12.01 g/mol and the atomic mass of hydrogen is 1.01 g/mol. Therefore, the molecular mass of methane is:
Molecular mass of CH4 = (1 x 12.01) + (4 x 1.01) = 16.05 g/mol
Now, we need to convert the amount of methane released into metric tons.
1 metric ton = 1,000 kg
8.44 metric tons = 8.44 x 1,000 = 8,440 kg
To convert the mass of methane into mass of carbon, we need to use the ratio of the molecular masses of carbon and methane.
1 mol of CH4 contains 1 mol of carbon
1 mol of CH4 has a mass of 16.05 g
1 mol of carbon has a mass of 12.01 g
Therefore,
16.05 g of CH4 contains 12.01 g of carbon
1 kg of CH4 contains (12.01/16.05) g of carbon
To convert the mass of methane into mass of carbon, we need to multiply it by the ratio of the molecular masses of carbon and methane.
Mass of carbon = (8,440 kg) x (12.01/16.05) g/kg
= 6,309 kg
Therefore, the herd of cattle released 6,309 kg (or 6.31 metric tons) of carbon into the atmosphere through the release of 8.44 metric tons of methane.
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Sn=0.14 (E)
Sn+2 = -0.15(E)
Which form of tin is the stronger reducing agent? OS O Sn +2?
Answers
0.14
Explanation:
I just needed to finish setting up my account
Ms. Clark is teaching her class about how plants make food for themselves. On the board, she has written this: __________ + air + water = food for plants
Answers
Answer:
sunlight
Explanation:
Sugar is added to iced tea and the contents are stirred until all of the sugar dissolves. How would the tea now be classified?
A. It is a solution
B. It is an element. C. It is a compound D. It is a pure substance
Answers
draw the aldehyde produced from the oxidation of ch3ch2ch2c(ch3)2ch2oh.
Answers
The aldehyde produced from the oxidation of ch3ch2ch2c(ch3)2ch2oh is 2-methylbutanal. The structure shown in image below:
The oxidation of an alcohol produces an aldehyde. In this case, the alcohol is ch3ch2ch2c(ch3)2ch2oh. The oxidation can be carried out using a variety of oxidizing agents, such as potassium permanganate or chromic acid. The oxidation reaction removes the two hydrogen atoms from the hydroxyl group, leaving behind a carbon-oxygen double bond. The resulting aldehyde has the same number of carbon atoms as the original alcohol, but it has a double bond between the carbon atom and the oxygen atom.
In the case of 2-methylbutanal, the double bond is between the second and third carbon atoms. The first carbon atom is attached to three hydrogen atoms, the second carbon atom is attached to the double bond and one hydrogen atom, the third carbon atom is attached to two hydrogen atoms, and the fourth carbon atom is attached to two methyl groups.
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what should we do to reduce the risk when working with concentrated acids and bases
Answers
What should be done to reduce the risk when working with concentrated acids and bases are;
1) Ensure that the concentrated acids and bases are stored separately in safety cabinets.
2) If you don't have separate safety cabinets and the must be stored in same cabinet, then you must ensure that they are stored in separate compartments.
3) Lastly, the separate compartments or cabinets must have their separate spill containment compounds.
When working with strong acids and bases during neutralization reactions, usually the production of gases can make the solution which is corrosive to splash and get to people around there.
Due to how strong the acids and base are, these splashes from the neutralized solution could have potentially damaging effects on humans when it contacts them by either casing skin burns or even blindness.
Now, to reduce the risk of the adverse effects stated above, what could be done is;
1) Ensure that the concentrated acids and bases are stored separately in safety cabinets.
2) If you don't have separate safety cabinets and the must be stored in same cabinet, then you must ensure that they are stored in separate compartments.
3) Lastly, the separate compartments or cabinets must have their separate spill containment compounds.
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Step 1 of the Scientific Method is to
O Hypothesis
Research
O Ask a Question
O Collect Data
Answers
Answer:
i also need this answer
Explanation: