Answer:
(a) GaF3, gallium(III) fluoride
(b) LiH, lithium hydride
(c) AlI3, aluminum(III) iodide
(d) K2S, potassium sulfide
Calculate the root-mean-square (rms) in m/s for an NO2 molecule at 95°C.
The root mean square velocity of nitrogen molecules at 25°c is 515 m/s.
What is the root mean square?The square root of the mean square, or the arithmetic mean of the squares of a particular collection of numbers, is referred to as the root mean square (RMS or rms).
Root Mean Square, or RMS The d.c. current/voltage that dissipates the same quantity of power as the average power wasted by the alternating current/voltage is represented by the current/voltage of the alternating current/voltage.
One kind of mean is the root mean square. Since the squaring turns all of the numbers into non-negative numbers, it is helpful when attempting to determine the average "size" of numbers where the sign is irrelevant. Calculating a collection of integers' standard deviation using the root mean square is the most typical application.
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I WILL MARK BRAINLIEST
Tool used for spreadsheets and analysis.
Microsoft PowerPoint
Microsoft Excel
Microsoft Word
Tool used to create presentations.
Microsoft PowerPoint
Microsoft Excel
Microsoft Word
Tool used for authoring documents.
Microsoft Word
Microsoft Excel
Microsoft PowerPoint
Choose the correct tool for the given scenario.
--You have been hired as an intern by a local library. They would like a report on which types of books tend to get borrowed the most to determine what additional books they should purchase. Which of these methods do you think would be the best approach?
Research the problem and give a presentation on how you approached the problem, and provide the different books as examples on various slides of the presentation.
Research the problem and provide a list in a spreadsheet with the book titles and the number of times they are borrowed.
Choose the correct tool for the given scenario.
--You have been working as a customer care specialist answering the phone and helping with technical support. Your manager has asked you to describe the most difficult problems you faced and how you handled them. Which of these would be best.
An email to your manager with this information.
A document describing each problem and how you handled it.
A spreadsheet with all your calls and the toughest ones highlighted using fill color.
1) Tool used fοr spreadsheets and analysis are Micrοsoft Excel. Thus, option (b) is cοrrect.
2) Tool used tο create presentations are Microsoft PowerPoint. Thus, Option a) is cοrrect.
What's is a spreadsheet?A spreadsheet is a type of cοmputer software that captures, displays, and manipulates data that is οrganized in rows and columns.
Users can style, organize, and cοmpute data in a spreadsheet using Microsoft Excel.
You can use PowerPoint on your Cοmputer, Laptop, or mobile device to: Create slideshows from inception οr from a template
Microsoft Word is a word editing sοftware that can create basic and complicated documents.
3) Tool used for authoring dοcuments are Microsoft Word. Thus, Option a) is cοrrect.
4) the best apprοach would be Research the problem and give a presentation on how yοu approached the problem, and provide the different books as examples on various slides of the presentation. Thus, Option a) is cοrrect.
5) The best wοuld be A spreadsheet with all your calls and the toughest ones highlighted using fill cοlor. Thus, Option c) is cοrrect.
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PLEASE ANSWER ASAP
A) Calculate the molecular formula of a compound with an empirical formula of P2O5 and a molar mass of 283.88 g/mol.
B) Calculate the empirical formula of a compound containing 52.14% carbon, 13.12% hydrogen, and 34.73% oxygen.
Answer:
P4O10
Explanation:
Imagine that you work in a crime lab, and the police bring to you a sample of a white powder that they believe to be cocaine (C17H21NO4). When you carry out a combustion analysis on a 32 mg sample, you find that the sample contained 21.9 mg of carbon, 2.5 mg of hydrogen, 2.3 mg of nitrogen, and 5.3 mg of oxygen. What is the empirical formula for the white powder? Is this consistent with the molecular formula for cocaine?
The empirical formula of the white powder is CH1.5N1O2.
Empirical formula calculation
To find the empirical formula of the white powder, we need to determine the ratios of the elements present in the sample. We can assume that the sample contains 100 g of the powder, and then convert the masses of each element to moles using their molar masses:
mass of C = 21.9 mg = 0.0219 g = 0.0018 mol
mass of H = 2.5 mg = 0.0025 g = 0.0025 mol
mass of N = 2.3 mg = 0.0023 g = 0.0017 mol
mass of O = 5.3 mg = 0.0053 g = 0.0033 mol
Next, we can divide each of the mole values by the smallest mole value to get the simplest whole number ratio of the elements:
C: 0.0018 mol / 0.0017 mol = 1.06 ≈ 1
H: 0.0025 mol / 0.0017 mol = 1.47 ≈ 1.5
N: 0.0017 mol / 0.0017 mol = 1
O: 0.0033 mol / 0.0017 mol = 1.94 ≈ 2
Therefore, the empirical formula of the white powder is CH1.5N1O2.
To check if this is consistent with the molecular formula for cocaine (C17H21NO4), we can calculate the molecular formula mass of the empirical formula and compare it to the molecular formula mass of cocaine:
Empirical formula mass = 13.5 g/mol (approximately)
Molecular formula mass of cocaine = 303.4 g/mol
The empirical formula mass is much smaller than the molecular formula mass of cocaine, so the empirical formula is not consistent with the molecular formula.
Therefore, this suggests that cocaine is a larger molecule, made up of many repeating units of CH1.5N1O2. To determine the molecular formula of cocaine, we would need additional information, such as the molecular mass of the compound.
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Question 12
Section 6-9
The theoretical yield of product for a particular reaction is 65.45 g. A very careless student obtained only 21.47 g of product after carrying out this reaction.
What is the percent yield that this student obtained?
• Enter a number only; do not spell
• Include the correct number of significant figures for your answer
Answer: % yield
Answer:
Explanation:
% yield = (actual yield / theoretical yield) x 100%
actual yield = 21.47 g
theoretical yield = 65.45 g
% yield = (21.47 g / 65.45 g) x 100%
% yield = 32.80%
Therefore, the student obtained a percent yield of 32.80%.
Help PLEASE NEED THIS ASAP
Lab Thermal Energy Transfer Lab Report
What is the purpose of the lab , the importance of the topic, and the question you are trying to answer?
What is your hypothesis (or hypotheses ) for this experiment?
What methods are you using to test this ( or each ) hypothesis?
Locate the data and observations collected in your lab guide. What are the key results? How would you best summarize the data to relate your findings
Do you have quantitative date (numerical results or calculations)? Do you have qualitative data ( written observations and descriptions )? How can you organize this data for your report
What do the results indicate
If you constructed graphs what trends do they indicate in your data
Were there any problems with the experiment or the methods? Did you have any surprising results?
What do the results tell you about your hypothesis?
How does the data support your claim above?
If you could repeat the experiment and make it better what would you do differently and why?
Answer:
The purpose of the lab is to study thermal energy transfer and its effects on different materials. The topic is important because understanding thermal energy transfer is essential to many fields, including engineering, physics, and chemistry. The question you are trying to answer may be something like "How does thermal energy transfer affect the temperature of different materials?"
Your hypothesis may be something like "Materials with high thermal conductivity will transfer heat more efficiently than materials with low thermal conductivity."
To test this hypothesis, you may use a setup where you have a heat source, a temperature sensor, and various materials with different thermal conductivities. You would measure the temperature changes of the materials as they are heated and cooled.
The key results of your lab may include the temperature changes of each material over time, the rate of heat transfer, and any observations about the behavior of the materials during the experiment. To summarize the data, you may create graphs or charts that show the temperature changes of the materials over time.
You may have quantitative data such as temperature readings and calculations of heat transfer rates, as well as qualitative data such as observations of the behavior of the materials during the experiment. You can organize this data in tables, graphs, and written descriptions.
The results may indicate that materials with higher thermal conductivity do transfer heat more efficiently, as your hypothesis predicted.
If you constructed graphs, you may observe trends such as a steeper slope for materials with higher thermal conductivity or a plateau in temperature once a material reaches its maximum heat capacity.
Possible problems with the experiment may include equipment malfunctions or inaccuracies in temperature readings. Surprising results may include unexpected temperature changes or behavior of certain materials.
The results may support your hypothesis and indicate that materials with high thermal conductivity transfer heat more efficiently.
The data supports your claim by showing clear temperature changes and rates of heat transfer for each material.
If you could repeat the experiment, you may try using different materials or adjusting the setup to control for potential confounding factors. For example, you may try using materials with similar heat capacities or reducing heat loss during the experiment.
Explanation:
A doctor's order for 2.21 g of Keflex is available as 250 mg tablets. How many tablets of Keflex are needed? Please remember to include the correct unit with your answer.
Answer:
9 tablets.
Explanation:
2.21gg is 2210mg
2210/250= 8.84
HELP! Which of the following factors will only affect the reaction rate of a solid?
A. Temperature
B. Concentration
C. Surface area
D. Catalyst
Answer:
A.Temperature
Explanation:
what is the ionization constant for a 0.10 mole/dm3 of ethanoic acid solution which has a ph of 2.88
The ionization constant (Ka) for a 0.10 M solution of ethanoic acid with a pH of 2.88 is [tex]5.82 * 10^(^-^5^)[/tex]
What does equilibrium constant mean?The ratio of reactant to product amounts that is used to predict chemical behaviour is the definition of the equilibrium constant for a chemical process.
Ka = [H+][A-] / [HA]
where [H+] is the concentration of hydrogen ions, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the weak acid.
For ethanoic acid (also known as acetic acid), the ionization reaction is:
CH3COOH + H2O ⇌ CH3COO- + H3O+
pH = -log[H3O+]
The Ka expression can now be written as:
[tex]Ka = (x)^2 / (0.10 - x)[/tex]
At equilibrium, the value of x is very small compared to 0.10 M, so we can make the approximation that 0.10 - x ≈ 0.10.
Therefore, we can simplify the Ka expression to:
[tex]Ka = x^2 / 0.10[/tex]
To solve for x, we can use the equilibrium concentration of [H3O+] we calculated earlier:
[tex]x = [H3O+] = 7.68 * 10^(^-^3^) M[/tex]
Substituting this value into the simplified Ka expression, we get:
[tex]Ka = (7.68 * 10^(^-^3^))^2 / 0.10 = 5.82 * 10^(^-^5^)[/tex]
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Existen los super-genes.
Group of linked genes acting as an allelic unit due to the suppression of crossing-over is called supergene.
What is meant by a supergene?Chromosomal region encompassing multiple neighboring genes that are inherited together because of close genetic linkage is called supergene.
The best examples of supergenes are the morphologically and genetically distinct sex chromosomes which has evolved independently in many groups of animals and plants. Sex chromosomes evolve from autosomes via mutation that causes its bearers to develop into a male or female.
Supergenes arise following the establishment of mutations at minimum of two sites, followed by sequential accumulation of additional mutations.
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Note: The question given on the portal is incomplete. Here is the complete question.
Question: What is the meaning of supergene?
3. Write the electron arrangement for the following atoms and ions.
A. Si
B. Ne
C. B³+
D. C1¹-
Answer & xplanation:
A. The electron arrangement for Si (atomic number 14) is: 1s² 2s² 2p⁶ 3s² 3p².
B. The electron arrangement for Ne (atomic number 10) is: 1s² 2s² 2p⁶.
C. B³+ is a cation, which means it has lost three electrons compared to neutral boron (B). Therefore, its electron arrangement is: 1s² 2s² 2p¹.
D. Cl¹⁻ is an anion, which means it has gained one electron compared to neutral chlorine (Cl). Therefore, its electron arrangement is: 1s² 2s² 2p⁶ 3s² 3p⁶.
When carbon dioxide dissolves in water, it sometimes reacts with water to form carbonic acid as in this balanced equation:
CO2 + H2O → H2CO3.
If 495 milliliters of carbon dioxide at 25°C and 101.3 kilopascals reacts with excess water, what is the theoretical yield of carbonic acid?
Use the periodic table and the ideal gas resource.
The theoretical yield of carbonic acid is 12 %.
What is carbon dioxide ?
One part carbon and two parts oxygen make up the gas called carbon dioxide. Its usage by plants to create carbohydrates during a process known as photosynthesis makes it one of the most significant gases on the planet.
What is reaction ?
The transformation of one or more reactants into one or more new products is referred to as a chemical reaction. Substances are made of chemical constituents or compounds. The transformation of one or more reactants into one or more new products is referred to as a chemical reaction. Substances are made of chemical constituents or compounds.
Therefore, The theoretical yield of carbonic acid is 12 %.
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How many molecules are present in 15.7 grams of zinc oxide? Show the results of 1.144 x 1023 molecules
In 15.7 grams pf zinc oxide, there are roughly 1.144 x 1023 molecules. In order to treat or prevent skin irritation from things like wounds, burns, and diaper rash, zinc oxide is a medicinal cream, ointment, or paste.
How does zinc oxide affect the skin?Diaper rash is treated and prevented using topical zinc oxide lotion. As a result of diaper use, it is also utilized to shield skin from irritation and moisture.
Does zinc oxide pose a risk to people?* "Metal fume fever" can be brought on by exposure to zinc oxide. This flu-like condition causes symptoms like a metallic taste in people's mouths, headache, fever, chills, pains, tightness in the chest, and cough. After exposure, the symptoms may not appear for some hours, and they often manifest one or two days later.
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PO3-
2.64 Complete the table by filling in the formula for the ionic compound formed by each pair of cations and anions, as shown for the first pair.
Ion
02-
Na
Ca2+
Fe2+
A13+
Na2O
NO3
AsO43-
The completed table that fills the formula for the ionic compound has been given below:
How to solveTo form an ionic compound from the given cation and anion we need to balance the charges of the cation and anions.
For example: Suppose we have a cation C3+ and an anion A-. Thus, to balance the charge we need 1C3+ and 3A-, the formula of the ionic compound formed CA3.
Ion K+ NH4+ Mg2+ Fe3+
Cl- KCl NH4Cl MgCl2 FeCl3
OH- KOH NH4OH Mg(OH)2 Fe(OH)3
CO32- K2CO3 (NH4)2CO3 MgCO3 Fe2CO3
PO43- K3PO4 (NH4)3PO4 Mg3(PO4)2 FePO4
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Hydrogen produced from a hydrolysis reaction was collected over water. The data is compiled in the table.
Total volume of H2(g) collected 94.27 mL
Temperature 23.0 °C
Barometric pressure 738 mmHg
Vapor pressure of water at 23.0 °
21.0 mmHg
Calculate the moles of hydrogen gas produced by the reaction.
To calculate the moles of hydrogen gas produced by the reaction, we need to use the ideal gas law equation:
PV = nRT
Where:
P = Total pressure (barometric pressure - vapor pressure of water)
V = Volume of hydrogen gas collected
n = Number of moles of hydrogen gas
R = Universal gas constant (0.08206 L·atm/mol·K)
T = Temperature in Kelvin (23°C + 273.15)
What is the moles of hydrogen gas produced by the reaction?First, let's calculate the total pressure:
Total pressure = Barometric pressure - Vapor pressure of water
Total pressure = 738 mmHg - 21.0 mmHg
Total pressure = 717.0 mmHg
Now, we can plug in the values into the ideal gas law equation:
n = PV/RT
n = (717.0 mmHg)(94.27 mL)/(0.08206 L·atm/mol·K)(23.0°C + 273.15)
n = 0.00345 mol
Therefore, the moles of hydrogen gas produced by the reaction is 0.00345 mol.
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Give the symbols for the following elements: nitrogen sodium chromium
nitrogen = N
sodium = Na
chromium = Cr
At what absolute temperature do the Celsius and Fahrenheit temperature scales give
the same numerical value? What is the value?
Answer: The answer to this question is negative 40 degrees Fahrenheit
Explanation:
he decomposition of sulfuryl
chloride (SO2Cl2) is a first-order process. The rate
constant for the decomposition at 660 K is 4.5 x 10-2 s-1.
(a) If we begin with an initial SO2Cl2 pressure of 450 torr,
what is the partial pressure of this substance after 63 s?
(b) At what time will the partial pressure of SO2Cl2 decline
to one-third its initial value?
1) The pressure is 26.4 torr
2) The time is 24.4 s
What is a decomposition reaction?A decomposition reaction is a type of chemical reaction in which a single compound breaks down into two or more simpler substances. In other words, it is the opposite of a synthesis reaction, where two or more substances combine to form a more complex substance.
We know that;
[tex]lnPt =lnPo - kt\\lnPt = ln(450) - ( 4.5 x 10^-2 * 63)\\Pt = eln(450) - ( 4.5 x 10^-2 * 63)\\Pt = 26.4 torrln[1/3(450)] = ln 450 - (4.5 x 10^-2t)\\5 = 6.1 - 0.045t\\5 - 6.1 = - 0.045t\\t = 24.4 s[/tex]
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Which of the following is NOT an accurate way to measure wavelength?
A. crest to trough
B. trough to trough
C. half crest to half crest
D. crest to crest
Answer: D
Explanation: crest to crest to the crust to crust to the west to west.
From his experiments, J. J. Thomson concluded that
cathode ray particles can move at very fast speeds.
cathode ray particles can be moved by electric current.
atoms contain small positively charged particles that are called protons.
atoms contain small negatively charged particles that are called electrons.
J.J Thomson performed some experiments to demonstrates the structure of atom. He discovered the small negatively charged particles later called the electrons. Hence, option d is correct.
What was atomic model by J.J Thomson ?There were various atomic models to describe the structure and electronic properties of atom. J.J. Thomson conducted the cathode ray experiment where, he he hit the cathode ray to and measured the electric charge with electrometer.
From this, he concluded that the electric charge and the cathode rays was combined and are the same entity. The negatively charged particles in the atoms then called as electrons. Therefore, option d is correct.
Thomson demonstrated the plum- pudding model of atom, where the negatively charged electrons are randomly located inside the atom as the seeds in the plum-pudding. But later modern atomic models replaced this concept.
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If you wanted to analyze a polymer that is not very soluble in most solvents with mass spectroscopy and get an estimate of its molecular weight the best technique would be:
a) triple quadrupole
b) Electrospray MS
c) MALDI coupled with time of flight (TOF) MS
d) Standard GC MS
Answer:
c) MALDI coupled with time of flight (TOF) MS would be the best technique to analyze a polymer that is not very soluble in most solvents with mass spectroscopy and get an estimate of its molecular weight. This technique is particularly suited for the analysis of large molecules such as polymers and biopolymers. MALDI (matrix-assisted laser desorption/ionization) is a soft ionization technique that uses a laser to desorb and ionize molecules from a solid matrix. The resulting ions are then accelerated in a time-of-flight (TOF) mass analyzer, which separates them according to their mass-to-charge ratio (m/z). The mass spectrum obtained from this technique provides information on the molecular weight of the polymer.
Explanation:
7 characteristics of living things
Answer: The 7 Characteristics of Living Things are
Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion, and Nutrition
Explanation:
Movement: Change, Position, or place of an organism or part of an organism
Respiration: Break down food in cells and release energy
Sensitivity: Sense Respond, changes in the environment (Stimuli)
Growth: Increase the Size, Mass of an organism By increasing cell number and cell size
Reproduction: Produce offspring to prevent extinction of species
Excretion: Removal Tox Materials, waste products of metabolism, substance in Excess by chemical reactions in cells (respiration)
what are the cell called and functions
The cell organelles in the diagram are lysosome and nucleus.
What is an Organelle?This is referred to as a small structure in a cell that is surrounded by a membrane and has specific types of functions based on their respective properties.
The nucleus is a type of organelle which is involved in the control of the activities of the cells such as controlling of the genetical information of the cell and thus the heredity characteristics of an organism and control of the protein and enzyme synthesis. Another organelle is referred to as the lysosomes which functions as the digestive system of the cell, serving both to degrade material taken up from outside the cell and to digest obsolete components of the cell itself.
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A game of tug-of-war, in which two teams pull on opposite ends of a rope is shown here. What needs to happen to make the center of the rope go in one direction?
The ground needs to provide more friction for both teams.
Both teams have the same amount of people.
The rope needs to have no mass of its own.
One team pulls with more force than the other.
Answer:
One team pulls with more force than the other
What did Ernest Rutherford’s gold foil experiment demonstrate about atoms?
Answer:
Explanation:
Rutherford's gold foil experiment revealed that most of the alpha particles went right through the gold foil but only a couple got deflected, demonstrating that the atom has mostly empty space with a small, hard, positively charged nucleus. Because of this, Rutherford proposed the nuclear model of the atom.
Answer:
Hope this helps
Explanation:
Rutherford took a thin gold foil and made alpha race particles to pass through it. He saw that most of the particle passed straight through the gold foil . But some deflected in small angles and 1 in 12000 particles deflected/rebounded back.
These observation made Rutherford conclude that-
- Most of the place inside an atom is empty because particles passed straight through.
- some particles deflected in small angles meaning the positive charge in an atom occupies very less space.
The mass of the beaker and watch glass: 57.880g
the mass of the beaker + watch glass +sample: 59.993g
The mass of the beaker + watch glass+ sample after first heating : 59.710
Mass of Sample = 59.993 - 57.880 = 2.113 g
Mass of Sample after 1st Heating = 59.710 - 57.880 = 1.83 g
Mass of Water Removed = 2.113 - 1.83 = 0.283 g
Mass of Sample after 2nd Heating = 59.7 - 57.88 = 1.82 g
Mass of Water Removed = 1.83 - 1.82 = 0.01 g
Total Mass of Water lost = 0.293 g
Moles of Water lost = 0.293 / 18 = 0.01628
Mass of Anhydrate = 1.82 g
Now check the molar mass of each hydrate:
CuSO4.5H2O = 159.61 g/mol
ZnSO4.7H2O = 287.58 g/mol
BaCl2.2H2O = 244.26 g/mol
MgSO4.7H2O = 246.47 g/mol
Now, Check the mole ratio of Anhydrous Salt : Water to get the required stoichiometric coefficient of H2O.
For BaCl2.2H2O,
Answer: BaCl2.2H2O
What is anhydrous salt?
An anhydrous salt is a chemical compound that does not contain water molecules as part of its crystal structure. It is the opposite of a hydrated salt, which contains a specific number of water molecules within its crystal structure. Anhydrous salts are usually formed by heating hydrated salts to a high temperature to drive off the water molecules. Anhydrous salts are often used in chemical reactions, as they can react more efficiently than hydrated salts due to their greater purity and stability. Some common examples of anhydrous salts include anhydrous sodium sulfate, anhydrous calcium chloride, and anhydrous magnesium sulfate.To know more about anhydrous salt, click the link given below:
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What is a precipitate?
a) insoluble ionic compound
b) metallic solid
c) soluble ionic compound
d) gaseous molecular compound
Show that the density of a 5kg solid cylinder that is 10cm tall with a radius of 3cm is 17.7g/cm^3
The density of the solid cylinder is calculated to be as approximately 17.7 g/cm³.
What is meant by density?The mass per unit of volume of a substance is known as density and symbol that is mostly used for density is ρ.
As the formula for the density of an object is:
density = mass / volume
volume = π x radius² x height
volume = π x (3cm)² x 10cm
volume = 282.74 cm³
mass = 5kg x 1000g/kg = 5000g
density = mass / volume
density = 5000g / 282.74 cm³
density ≈ 17.7 g/cm³
Therefore, the density of the solid cylinder is approximately 17.7 g/cm³.
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Show all work please.
Answer:
Explanation:
1. 546.0ml x [tex]\frac{L}{1000mL}[/tex]= 0.5460L
2. 86.0kg x [tex]\frac{1000g}{1 kg}[/tex]= 8.60x[tex]10^{4[/tex] g
3. 2.56 pound x [tex]\frac{16 ounces}{1 pound}[/tex]= 40.1 ounces
4. 75.3 pound x [tex]\frac{453.6 g}{1 pound}[/tex] = 45200 g
5. 12.5 yard x [tex]\frac{91.44 cm}{1 yard}[/tex] = 1140 cm
What is ionizing radiation?
A. electromagnetic radiation in the infrared region
B. electromagnetic radiation with energy low enough to damage cells
C. electromagnetic radiation in the visible light region
D. electromagnetic radiation with high enough energy to damage cells
Answer:
Explanation:
D. Ionizing radiation refers to any type of electromagnetic radiation or particle radiation that has enough energy to remove tightly bound electrons from atoms, resulting in the formation of ions. This includes radiation with wavelengths shorter than ultraviolet light, such as X-rays and gamma rays, as well as high-energy particles such as alpha particles, beta particles, and neutrons. Ionizing radiation can cause damage to cells and DNA, leading to health effects such as radiation sickness and an increased risk of cancer.