Which claim about x-rays is correct?A:There is an increased risk of a fetus developing leukemia if exposed to x-rays.B:Human-made x-rays are more harmful than naturally occurring x-rays.C:Medical x-ray technology is not regulated by any federal agencies.D:Modern medical x-rays use stronger radiation than earlier types.
Answers
The correct claim about x-rays is option D: Modern medical x-rays use stronger radiation than earlier types.
Explanation:
A: There is an increased risk of a fetus developing leukemia if exposed to x-rays. This claim is incorrect. While high doses of radiation, including x-rays, have been associated with an increased risk of cancer development, the risk to a fetus from diagnostic x-rays is generally considered very low, and the benefits of necessary medical imaging usually outweigh the potential risks.
B: Human-made x-rays are more harmful than naturally occurring x-rays. This claim is incorrect. X-rays are a form of electromagnetic radiation, and both naturally occurring and human-made x-rays have the same properties. The potential harm of x-rays depends on the dose and the specific circumstances of exposure, rather than the source.
C: Medical x-ray technology is not regulated by any federal agencies. This claim is incorrect. In the United States, medical x-ray technology is regulated by federal agencies such as the Food and Drug Administration (FDA) and the Nuclear Regulatory Commission (NRC). These agencies establish guidelines and standards to ensure the safe use of medical imaging equipment and the proper training of healthcare professionals.
D: Modern medical x-rays use stronger radiation than earlier types. This claim is correct. Over time, advancements in technology have allowed for the development of more efficient and precise medical imaging techniques. These advancements often involve the use of higher energy x-ray beams or enhanced imaging capabilities, which can result in higher radiation doses compared to earlier types of x-ray machines. However, it's worth noting that modern medical practices aim to minimize radiation exposure and follow the principle of ALARA (As Low As Reasonably Achievable) to ensure patient safety.
Therefore, option D is the correct claim about x-rays.
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Related Questions
Question 7 of 25
Lighting a match is an example of what kind of energy conversion?
O A. Chemical potential energy being converted to heat energy
B. Kinetic energy being converted to chemical potential energy
C. Chemical potential energy being converted to kinetic energy
D. Gravitational potential energy being converted to heat energy
Answers
Answer:
A
Explanation:
APEX
Lighting a match is an example of chemical potential energy being converted to heat energy. The correct option is A.
What is the conversion of energy?Conversion of energy is when the energy is converted from one form into another form. When chemical or physical reactions occur, there is always a conversion of energy from one form to another.
When we match a light, there is a chemical, Phosphorous sulfide which is rubbed against other chemical, and react and produce fire, so it is converted into heat energy.
Thus, the correct option is A. Chemical potential energy is converted to heat energy regarding lighting a match.
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How many joules of heat is needed to heat 68.00 grams of aluminum foil from
55.00 °C to 93.00 °C if aluminum has a specific heat of 0.90 J/g °C?
Answers
Answer:
2,325.6
Explanation:
You use the formula
Q =mco
M =mass =68
C=0.9
O=temperature increases =93-55=38
Then multiple all this 3
Q=68*0.9*38
The number of joules of heat that is needed to heat 68.00 grams of aluminum foil is 2,325.6.
What is specific heat?The amount of energy needed to raise the temperature of one gram of a substance by one degree Celsius.
By the formula of heat
Q = mct
The mass of aluminum is 68.00
the difference in temperature is 93.00 °C - 55.00 °C = 38.00
The specific heat is 0.90 J/g
Putting the values in the equation
\(Q = mct\\\\Q = 68.00 \times 0.90 \times 38.00 = 2325.6\)
Thus, the joules of heat is 2325.6 J.
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a reaction may be carried out so that a gaseous product is collected over water. which statement describes how to calculate the pressure due to the product gas alone?
Answers
The pressure of the gaseous product alone can be calculated by subtracting the pressure of the water vapor, also known as the vapor pressure of water, from the total pressure of the gas collected over water.
When a reaction is carried out so that a gaseous product is collected over water, the pressure of the gaseous product can be affected by the pressure of the water vapor present in the collection container. To calculate the pressure due to the product gas alone, one must subtract the pressure of the water vapor (also known as the vapor pressure of water) from the total pressure of the gas collected. The vapor pressure of water is dependent on the temperature, it can be looked up in a table or calculated using an equation, and it can be used to determine the pressure of the gaseous product alone. This is important to know in order to accurately measure the amount of product gas produced in the reaction.
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When a 30.98-g sample of phosphorus reacts with oxygen, a 71.00-g sample of phosphorus oxide is formed.
a. What is the percent composition of the compound?
b. What is the empirical formula for this compound?
Answers
2. write a conclusion statement that will address the following:
write in complete sentences.
is your hypothesis supported or not? explain using your data/calculations for support.
the accuracy & precision of your data.
possible further experimentation.
possible sources of error
.
(the hypothesis is : if the density of the object is 19.32 g/ml then the object is gold)
Answers
Based on the data and calculations obtained, it can be concluded that the hypothesis stating, "If the density of the object is 19.32 g/ml, then the object is gold" is not supported.
To support this conclusion, the data and calculations regarding the density of the object should be analyzed. If the calculated density of the object differs significantly from the expected value of 19.32 g/ml, it indicates that the object is not gold.
The accuracy and precision of the data can be assessed by comparing the calculated density with the expected density value. If the calculated density is close to the expected value, it suggests high accuracy. Additionally, if multiple measurements of density yield consistent results, it indicates high precision.
Further experimentation could involve additional tests to determine the identity of the object. These tests could include assessing other physical or chemical properties such as melting point, electrical conductivity, or reactivity with certain substances.
Possible sources of error in the experiment could include instrumental errors in measuring the mass or volume of the object, contamination of the object, or inaccuracies in the known density of gold used for comparison. These factors could contribute to deviations between the calculated and expected densities.
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What is the equation for lactic fermentation after glycolysis?.
Answers
The equation for lactic fermentation after glycolysis is:
pyruvic acid + NADH → lactic acid + NAD⁺
Skeletal muscles are where lactic acid fermentation takes place. When there is not enough oxygen, lactate dehydrogenase converts pyruvate to lactic acid. Lactic acid accumulation in the muscles causes fatigue. Muscle cells and other bacterial and animal cells engage in a type of anaerobic fermentation.
The metabolic process known as lactic acid fermentation turns glucose or other six-carbon sugars into the metabolite lactate, which is the lactic acid in solution, and cellular energy.
The creation of many food products involves the bacterial process known as lactic fermentation. It serves a critical function in food safety by giving the finished products distinctive scents and textures.
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How big was the universe after 100 seconds
Answers
Answer:
The Universe was once just the radius of the Earth-to-the-Sun, which happened when the Universe was about a trillionth (10-12) of a second old. .
Explanation:
Answer: like 25 0's i think
Explanation:
for the purposes of determining electron configuration of ions, when electrons are added to a neutral atom, they will inhabit orbitals according to:
Answers
Pauli exclusion principle, the Aufbau principle, and the Hund's rule.
Moreover, In simple terms, the Aufbau principle means fill the orbitals from bottom to top. In simple terms, Hund's rule requires single occupancy before pairing. Pauli Exclusion Principle. No two electrons in a atom can have an identical set of four quantum numbers.
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Find the Break-Even point
Fixed costs = $790
Revenues (selling price x # sold) = $1. 75 x 180
Variable costs = $81
# of units = 346
Answers
To find the break-even point, we need to determine the number of units at which the total cost equals the total revenue. In this case, variable costs of $81, the break-even point is at approximately 459 units.
The break-even point is the point at which the total cost equals the total revenue, resulting in zero profit or loss. To calculate the break-even point, we need to consider the fixed costs, variable costs, and revenues.
In this scenario, the fixed costs are given as $790, the revenues are $1.75 per unit for 180 units sold, and the variable costs are $81. The formula for calculating the break-even point is:
Break-even point = Fixed costs / (Selling price per unit - Variable cost per unit)
Substituting the given values, we have:
Break-even point = $790 / ($1.75 - $81/180)
Simplifying the equation, we find:
Break-even point ≈ 459 units
Therefore, the break-even point is approximately 459 units, meaning that the company needs to sell at least 459 units to cover its costs and avoid a loss.
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how do two oxygen atoms cancel out each other if they pull in opposite directions and how does the molecule become nonpolar
Answers
An even distribution of electron density across the molecule, which means that the molecule has no distinct positive or negative ends. This lack of polarity makes the molecule symmetrical, and the forces of attraction between individual molecules are weak. Consequently, nonpolar molecules tend to have low boiling points and are generally insoluble in polar solvents.
When two oxygen atoms come together to form an oxygen molecule (O2), they share electrons to form a covalent bond. In this bond, each oxygen atom shares two electrons with the other oxygen atom, creating a stable molecule.
While it is true that the oxygen atoms in O2 molecule are electronegative and pull on the shared electrons in opposite directions, the two oxygen atoms are identical in terms of their electronegativity. This means that they pull on the electrons with equal strength, resulting in a balanced distribution of charge across the molecule. As a result, the molecule becomes nonpolar.
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Calculate the percent ionization of a 0.381 M solution of hydrocyanic acid.
Answers
Answer:
.00402 %
Explanation:
hydrocyanic acid (HCN) is a weak acid with a Ka of 6.17*10^-10 so you need to do a RICE table
initial concentration of HCN is .381 and initial H+ and CN- concentration is 0.
that means the equillibrium concentration of HCN will be (.381-x) and H+ and CN- will be x
put that into the formula for Ka, so it'll be Ka = x^2/(.381-x) and then use quadratic equation to solve. You'll end up getting x = 1.5 * 10^-5.
Then to find percent ionization you solve (concentration of formed ions / initial HCN)
Which will be (1.5 * 10^-5 / .381) * 100 = .00402 % making it a very weak acid <3
g phosphate esters are prepared from a. phosphoric acid ester. b. phosphoric acid alcohol. c. phosphoric acid carboxylic acid. d. ester phosphate.
Answers
Phosphate esters are prepared from phosphoric acid and alcohol.
Let's understand more about phosphate esters:
Phosphate esters are organic molecules that consist of a phosphate group, a carbon atom, and an oxygen atom. The reaction of alcohol and phosphoric acid produces phosphate esters.
The ester is formed when one oxygen of the phosphate group is bonded to the carbon atom of the alcohol, and the other two oxygen atoms are bonded to the phosphorus atom (PO32-).
Phosphoric acid and alcohol are used to make phosphate esters. They are widely used in biological and biochemical systems as energy sources, cell membrane constituents, and signaling molecules.
When alcohols react with phosphoric acid, phosphate esters are formed. The reaction between the alcohol and the phosphate ion occurs with the elimination of a water molecule. The phosphate ion binds to the alcohol's oxygen atom, creating a covalent bond. In organic chemistry, this is called an ester linkage.
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Substance A is added to substance B to form a mixture. Which substance's chemical properties will change?
Answers
Answer:
When substance A is combined with substance B to produce a mixture, the chemical characteristics of one or both substances may alter. The specific characteristics and reactivity of the chemicals involved determine the magnitude and form of these alterations.
Explanation:
Substance A's chemical characteristics may stay constant in some instances, whereas substance B undergoes a chemical reaction or alteration. If substance A is inert, such as sand or sugar, and substance B is reactive, such as acid, the acid may react with or dissolve the sand or sugar, resulting in a chemical change in substance B.
Substance A may, on the other hand, undergo a chemical change while substance B stays intact. This can happen if substance A is reactive or reacts in the presence of substance B. For example, if A is a metal and B is an acid, the metal may undergo a chemical reaction with the acid, resulting in the production of a new compound or gas.
Furthermore, there are circumstances in which both compounds A and B undergo chemical modifications when they are mixed. This can happen when two chemicals react, leading in the production of new compounds or products.
To summaries, when substance A is mixed with substance B, the possibility of chemical property changes exists.
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what volume of liquid is in the graduated cylinder
Answers
Answer: 7.1
Explanation:
Whats the different between chemical property and chemical change, and physical property and physical change?
Answers
Answer:
I think the answer is A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.
Explanation:
I hope this helps.
Answer:
Physical change is the same substance, while a chemical change is a new substance.
Think about atoms, molecules, elements, and compounds. How can you relate it to your own body? To the world around you, right now? Please explain in four sentences.
Answers
Answer:
Everything we see comes from the transferring of electrons, or redox reactions. Fire, the screen you are staring at, and many other chemical reactions that happen everyday, we don't even care to notice anymore. Everything in our bodies is made up of compounds, from simple things such as H2O, and to the food we eat, loaded with sugar, C12H22O11. From the para-benzoic acid on your sunscreen, to the O3 in the ozone layer high above us.
Explanation:
a wet gas well is out of methane. what does it contain that will likely still be of value? a wet gas well is out of methane. what does it contain that will likely still be of value? propane polyethylene polystyrene polypropylene
Answers
A wet gas well that is out of methane may still contain other valuable components such as propane. Option A is correct.
Propane is a hydrocarbon gas that is commonly used as a fuel for heating and cooking, and as a feedstock for the production of petrochemicals.
Polyethylene, polystyrene, and polypropylene, on the other hand, are not typically found in natural gas wells. These are thermoplastic polymers that are produced through chemical processes using feedstocks derived from crude oil or natural gas.
Therefore, if a wet gas well is out of methane, it is more likely that the remaining valuable components would be other hydrocarbons such as propane, butane, or natural gas liquids (NGLs) rather than polymer materials like polyethylene, polystyrene, or polypropylene.
Hence, A. is the correct option.
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--The given question is incomplete, the complete question is
"A wet gas well is out of methane. what does it contain that will likely still be of value? A) propane B) polyethylene C) polystyrene D) polypropylene."--
To what temperature must 20.2 g of hydrogen gas be heated at 110 kPa to occupy a volume of 4.45 x 10^-2 kL
Answers
Answer:
59K
Explanation:
Using the general gas law equation:
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas constant (0.0821 Latm/molK)
T = temperature (K)
According to the information given in the question;
- mass of hydrogen gas = 20.2g
mole = mass/molar mass
mole = 20.2/2.015
mole = 10.01mol
- Pressure = 110 Kpa
1 kilopascal = 0.00987 atmosphere
110kPa = 110 × 0.00987
= 1.09atm
- Volume = 4.45 x 10^-2 kL
1 kL = 1000L
4.45 x 10^-2 kL = 4.45 x 10^-2 × 10³
4.45 × 10¹
= 44.5L
Using PV = nRT
T = PV/nR
T = 1.09 × 44.5/0.0821 × 10.01
T = 48.505/0.821
T = 59.02
T = 59K
9.32 L of pentane reacts with 36.4 L of oxygen. how many liters of carbon dioxide are formed?
Answers
Answer:
22.75 L CO2
Explanation:
Balance the Equation
C5H12 + O2 ==> CO2 + H2O Balance the Carbons
C5H12 + O2 ==> 5CO2 + H2O Now balance the Hydrogens
C5H12 + O2 ==> 5CO2 + 6H2O Now count up the oxygens on the right.
5*O2 + 6O ==> 10 O + 6 O ===> 16 Oxygens.
You have 2 on the left. You have to multiply the oxygens by 8
C5H12 + 8O2 ==> 5CO2 + 6 H2O
The equation is now balanced.
Now find out how much oxygen is needed to burn 9.32 L of Pentane
1 Liter Pentane / 8 Liters Oxygen = 9.32 L Pentane / x Cross multiply
x = 8 * 9.32
x = 74.56
Read this next sentence very carefully. You need 74.56 Liters of oxygen to burn all the pentane you have. There's not that much there. You only have 36.4 Liters of Oxygen. Some of the pentane won't get burned. Consequently there will be a shortage of CO2 as well.
Find out the number of Liters of Pentane that will be burned up.
1 / x = 8 / 36.4 Cross multiply
8x = 36.4 Divide by 8
8x/8 = 36.4/8
x = 4.55 Liters of Pentane will be used up.
Find the number of Liters of CO2
For every Liter of Pentane, 5 Liters of CO2 will be produced.
1/5 = 4.55/x Cross Multiply
x = 5 * 4.55
x = 22.75
What are the uses of hydrogen gas?
Answers
Answer:
The uses of hydrogen gas are to produce electricity, heat, power, fertilizer, and many more.
Hope this helps :)
Radioactivity is the -------------- disintegration of an atomic nucleus that releases energy to become stable *
a. Extraordinary
b. Normal
c. Ordinary
d. Spontaneous
Answers
Answer:
The answer is spontaneous.
Is the process represented below an example of a physical or a chemical
change?
CO2(s) —» CO2(g)
Answers
How many grams of BeF2 are present in 655 ml of a 0.442 m solution of Bef2
Answers
Answer:
13.6 g
Explanation:
The mass of BeF₂ present in 655 ml of a solution that is 0.442 M is equal to 13.82 g.
What is the molarity?We can calculate the concentration of a solute in a solution in terms of molarity, molality, and normality.
The molarity of a particular solution can be determined from the number of moles of a solute per unit volume of the solution.
The Molarity of the particular solution can be determined from the mathematical formula mentioned below:
Molarity = Moles/Volume of the Solution
Given, the molarity of BeF₂ solution = 0.442 M
The volume of the BeF₂ solution, V = 655 ml = 0.655 L
The molar mass of the BeF₂, M = 47.01 g/mol
Molarity of BeF₂ solution = m/(M × V)
0.442 = m/ (47.01 × 0.655)
m = 13.82 g
Therefore, 13.82 g of BeF₂ is required for the given solution.
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What is the shape of a CO2 molecule?
Answers
The groups of electrons are the double bonds, and these are furthest apart with an O-C-O bond angle of 180°. The model predicts that all three atoms in a CO2 molecule will be in a straight line and that the molecule will be linear
Hope this helps!
Based on this chart, what percentage of energy comes from fossil fuels?
Sources of Energy
Petroleum
37%
Other
1%
Natural Gas
24%
Renewable
Energy
7%
Coal
23%
Nuclear
Electric Power
8%
O A. 60%
OB. 23%
Ο Ο Ο Ο
C. 84%
O D. 37%
Answers
Answer:
37%+24%+23%=84% , i wish my answer is correct
A redox reaction is set up so that both half reactions take place in separate beakers that are connected by a salt bridge and a wire. A path for the transfer of ions is provided by the? (1) anode (2) cathode (3) salt bridge (4) wire
Answers
Answer:
Salt bridge
Explanation:
Salt bridge is used in an electrolytic cell to transfer electrons from the anode to the cathode.
Salt bridge are used because they do not interfere with the constituents of the cell I.e the anode (+very electrode) and cathode(-ve electrode).
Examples of salt bridges are AgNO₃, KCl etc.
Salt bridge can be described as a tool used to link the oxidation half cell and reduction half cell in an electrolytic set-up or galvanic cell.
What do scientists do?
O A. They make sure all facts fit scientific theories.
O B. They learn about the world through observation.
O C. They use their knowledge to make public policy.
O D. They make ethical
Answers
What if a small amount of air leaked back into the flask through the tightened screw clamp as the flask assembly was cooling? would your calculated value for the molar mass of air be too high, too low, or would there be no effect? explain
Answers
The measured volume of hydrogen gas will be too high.
The volume of hydrogen is measured by collecting the gas over water. The volume of the gas is measured as the volume of water displaced by the gas in an inverted container.
When air leaks into the graduated cylinder, more volume of water is displaced hence a higher volume of hydrogen gas is measured.The calculated molar volume of hydrogen will be too high as a result of this error
The gas being recorded during the experiment would not only include hydrogen gas, but the air that leaked into the eudiometer tube as well. This leads to the increase in the volume of hydrogen gas which will be too high.
Since the volume of hydrogen is too high, therefore the calculated molar volume of hydrogen would also be too high.
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5. The prefox Semi-Deans Capardy SC Based on your knowledge of the properties of elements, which kind of elements is most likely to make semiconductors?
Answers
a special type of covalent bond called a(n) bond joins two amino acids to each other through dehydration synthesis.
Answers
A special type of covalent bond called a peptide bond joins two amino acids to each other through dehydration synthesis.
During dehydration synthesis, a water molecule is removed as the carboxyl group of one amino acid reacts with the amino group of another amino acid.
This reaction forms a peptide bond, which creates a covalent linkage between the carbon atom of one amino acid and the nitrogen atom of the other amino acid. Peptide bonds are crucial for the formation of polypeptides and proteins, as they link the amino acid residues together in a specific sequence.
This process of joining amino acids through peptide bonds is essential for the synthesis of proteins and the overall structure and function of biological molecules.
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