The atomic mass of an element on the periodic table is based on which of the following? Explain why or why not for each answer.
a. The number of protons
b. The average atomic mass of all isotopes
c. The average number of electrons and neutrons from all isotopes
d. The number of neutrons
The correct answer to the given question is b) The average atomic mass of all isotopes is what an element’s atomic mass is based on in the periodic table.
An element has many isotopic masses, in which elements have same number of protons but different number of neutrons. An element in the periodic table has the average of all the isotopes. Atomic mass is the sum of protons and neutrons, without the involvement of electrons. For example, Chlorine has 2 isotopes Chlorine-35 having atomic mass 35 and Chlorine- 37 having atomic mass 37. The element Chlorine which is found in the periodic table has atomic mass 35.5 u, based on the average atomic masses and their relative abundance.
Therefore, atomic mass of an element on the periodic table is the average of their atomic mass of all isotopes.
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Which point would map onto itself after a reflection across the line y = –x?
The point that would map onto itself after a reflection across the line y = –x is (4, –4). The correct option is d.
What is a map?A point would have to be on the line in the first place for it to map onto itself following a reflection over the line.
To calculate the point on the given line, just substitute the x-values of the given points and solve for y.
There are three different x-values: -4, 0, and 4
Substituting these into y = -x
x = -4 ⇒ y = -(-4) = 4 → (-4, 4)
x = 0 ⇒ y = -(0) = 0 → (0, 0)
x = 4 ⇒ y = -(4) = -4 → (4, -4)
Therefore, the correct option is d, (4, –4).
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The question is incomplete. Your most probably complete question is given below:
(–4, –4) (–4, 0) (0, –4) (4, –4)
Density measurements can be used to analyze mixtures. For example, the density of solid sand (without air spaces) is about 2.84 g/mL. The density of gold is 19.3 g/mL. If a 1.00 kg sample of sand containing some gold has a density of 3.10 g/mL (without air spaces), what is the percentage of gold in the sample?
The percentage of gold in the sample if a 1.00 kg sample of sand containing some gold has a density of 3.10 g/mL is 9.83%.
Let S be the solid sandy mass which is inside the blend
Let G be the gold mass in such a blend
We have to find the percent G by mass
Mixture density can be calculated as
= total blend mass / total blend volume
= 3.10 g/mL
Mixture sum is
S + G = 1 Kg. = 1000g
Complete mixing volume = sand volume + gold volume
Complete mixing volume can be calculated as
=[tex](\frac{sand mass}{sand density} ) + (\frac{gold mass }{gold density} )[/tex]
Total mixture volume:-
[tex]= (\frac{S}{2.84} ) + (\frac{G}{19.3} )\\\\= \frac{(19.3 S + 2.84 G)}{54.812 mL} \\\\Mixture Density = \frac{mass mixture}{mixture volume}\\ \\= 3.10 \frac{g}{mL}[/tex]
⇒ [tex]3.10 = \frac{1000 g}{ \frac{(19.3 S + 2.84 G)}{54.812 mL}}[/tex]
[tex]19.3 S + 2.84 G = 17681\\\\When S+ G = 1000 g\\\\Solving equation:[/tex]
⇒[tex]19.3 S + 2.84 G = 17681[/tex]
∴ [tex]S + G = 1000 g[/tex]
⇒ 19.3 S + 2.84 = 17681
⇒ -2.84 S - 2.84 = -2840
________________________
⇒ 16.46 S = 14841
⇒ S = 901.7g Sand
Given,
⇒ S + G = 1000
⇒ G = 1000 - 901.7 g
⇒ G = 98.3 g Gold
Percentage of gold in the solution is
(98.3/1000) × 100 = 9.83%
Thus, we concluded that the percentage of gold in the sample if a 1.00 kg sample of sand containing some gold has a density of 3.10 g/mL is 9.83%.
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Monosodium glutamate is used to enhance the flavor of foods, it has the following composition: 13.6% Na; 35.5% C; 4.8% H; 8.3% N and 37.8% O, by mass.
What is the empirical formula of monosodium glutamate?
R= NaC5H8NO4
Answer:
Assume you have 1g of your sample.
Then 13.6% of this sample is Na, that is 0.136g.
Since you are to find the empirical formula, you need to find the number of moles of Na in 0.136g. You can do that by dividing by the atomic mass of Na: n(Na)=0.136g / 23.0 g/mol = 0.00591 mol
Next, you repeat this for all the other elements.
The last step is to pick the smallest number of moles that you get and divide the others by it. That way you should arrive at whole number coefficients for the empirical formula. The element with the smallest number of moles gets 1 as its coefficient).
What is the pH of an aqueous solution with a hydrogen ion concentration of [H+]=7.6×10−9 M?
The pH of an aqueous solution with a hydrogen ion is 8.11
pH is the quantitative measure of the acidity or basicity of aqueous or other liquid solutions
Here given data is concentration of [H⁺]=7.6×10⁻⁹ M
We have to find pH=?
Then, pH = -log(conc)
Then pH = -log(7.6×10⁻⁹)
pH = 8.11
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A fungicide dissolved in water was applied to the soil in which a rose plant was growing. It later appeared in the leaves. How did the fungicide reach the leaves?
The fungicide reaches to the leaves through the xylem's transpiration pull.
1. The fungicides are the chemicals which are used to removes fungus which on the plants and also stops the growth of fungus present on plants.
2. The fungicides are dissolved in water to make the dilute solution so that when it sprayed on the leaves, it easily absorbed by the soil.
3. The plants have special mechanism which helps in absorption of all the minerals that are present in the soil.
4. The xylem absorb mineral and water in the soil and phloem absorbs nutrients from the soil. Xylem pull ups the solution against the gravity and moves this solution to the surface of the leaves is called transpiration pull.
5. There are 3 mechanism that involved in the movement of fungicide are• Root pressure • Cohesive force • Capillary action
6. All these forces are worked to pull up the solution upward to the leaves.
Thus the xylem is a specialized mechanism present in the plants to pull up the solution upward against the gravity.
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A tortoise moves at a speed of 454 cm/min. How fast is the tortoise in mph?
Hint: there are 5280 feet in 1 mile
A) 0.17 mph
B) 0.34 mph
C) 17 mph
D) 0.0017 mph
Answer:
ACalculate the number of moles in 5.68 X 10^25 atoms of gold?
Answer:
196.96657 g/m
Explanation:
The molar mass of gold = 196.96657 g/m. The molar mass of gold is defined as the mass of 1 mole of gold atoms - typically specified in grams. Therefore the molar mass of gold is stated in units of grams/mole or g/m. It is also frequently called the Molecular Weight of Gold.
Which safety equipment is needed when working with materials that car
spatter?
Answer: Required personnel protection equipment (PPE) must be worn at all times
Explanation:
Calculate the energy per photon (in J) associated with a frequency of 1260 kHz. Submit answer in scientific notation using the format 0.00 x 10^0 (e.g. 0.000123 = 1.23 x 10^-4). Omit units and spaces.
Taking into account the definition of photon and energy of a photon, the energy per photon is 8.3538×10⁻³⁸ J.
Energy of a photonElectromagnetic radiation carries energy, which can be absorbed or emitted. To explain the processes of emission and absortion, Plank and Einstein proposed that the energy of radiation is composed of indivisible units (quanta). In each elemental process only a quantum of light can be emitted or absorbed. Each of these quanta was called a "photon".
The exchanges of energy between matter and radiation take place not continuously, but by discrete and indivisible quantities or quanta of energy. The quantum of energy is proportional to the frequency of radiation.
The relationship between the amount of energy (E) transported by the photon and its frequency (f) is determined by the following expression:
E=h×f
where:
E is the energy of a photon.h is the Planck's constant h. f is the frequency of electromagnetic radiation.Energy per photonIn this case, you know:
h= 6.63*10⁻³⁴ Jsf= 1260 kHz= 1,260,000 Hz= 1.26×10⁶ Hz (being 1 kHz=1000 Hz)Replacing in the definition of energy of a photon:
E= 1.26×10⁶ Hz× 6.63×10⁻³⁴ Js
E= 8.3538×10⁻³⁸ J
Finally, the energy per photon is 8.3538×10⁻³⁸ J.
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Mass, Density, and Volume- Word Problems
1. What volume in liters would be occupied by 0.22777kg of a material with a density of 0.00523kg/mL?
2. What is the density of a substance in mg/mL, if a sample with a volume of 1.91cm^3 has a mass of 0.00588kg?
Taking into account the definition of density, you have:
the volume will be 0.04355 L.the density of the substance is 3,078.534 mg/mL.Definition of densityDensity is defined as the property that matter has to compress into a given space. That is, density is a quantity that is defined as the amount of mass in a given volume of a substance.
The expression for calculating density is the ratio between the mass of a body and the volume it occupies:
density= mass÷ volume
Density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Volume in this caseIn this case, you know that:
Density= 0.00523 kg/mLMass= 0.22777 kgReplacing in the definition of density:
0.00523 kg/mL= 0.22777 kg÷ volume
Solving:
0.00523 kg/mL× volume= 0.22777 kg
volume= 0.22777 kg÷ 0.00523 kg/mL
volume= 43.55 mL= 0.04355 L (being 1000 mL= 1 L)
Finally, the volume will be 0.04355 L.
Density of a substanceIn this case, you know that:
Mass= 0.00588 kg= 5880 mg(being 1 kg= 1,000,000 mg)Volume= 1.91 cm³= 1.91 mL (being 1 cm³= 1 mL)Replacing in the definition of density:
density= 5880 mg÷ 1.91 mL
Solving:
density= 3,078.534 mg/mL
Finally, the density of the substance is 3,078.534 mg/mL.
SummaryIn summary, you have:
the volume will be 0.04355 L.the density of the substance is 3,078.534 mg/mL.Learn more about density:
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Which of the following accurately describes circuits? Question 11 options: A) In a parallel circuit, there's only one path for the current to travel. B) In a series circuit, the amount of current passing through each part of the circuit may vary. C) In a series circuit, the current can flow through only one path from start to finish. D) In a parallel circuit, the same amount of current flows through each part of the circuit.
In a series circuit, the current can flow through only one path from start to finish.
What is a circuit?The term circuit has to do with the path that current can pass through. Charge flows in a circuit in the direction that current is flowing. Also, resistors in a circuit could be connected in series or in parallel.
In a series connection, the resistors are connected end to end an current flows in one direction.
Thus, the statement that is true is that; In a series circuit, the current can flow through only one path from start to finish.
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Answer: C. In a series circuit, the current can flow through only one path from start to finish.
(just took the test so C is right)
what do these two changes have in common?
Erosion caused by wind
beating an egg
The Erosion caused by wind and beating an egg both the changes are physical change.
What is erosion?Erosion is defined as a geographical process in which earthen material will blow away and caused by a natural force such as wind or water.
There are mainly four types of erosion
Splash erosionSheet erosionRill erosionGully erosionPhysical change can be defined as a type of change where only the physical properties of the matter changes.
Thus, the Erosion caused by wind and beating an egg both the changes are physical change.
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What number of hydrogen atoms is in 0.48 mol of Prevacid?
There are 4 * 10^24 atoms of hydrogen in 0.48 moles of prevacid.
What is prevacid?The drug prevacid is used as an antacid. What is does is to reduce the amount of acid that could be produced in the stomach of a person. As a result of this, the drug prevacid is able to relieve a person of heartburn and stomach ulcer.
Thus time, we want to obtain the number of hydrogen atoms that id present in one 0.48 moles of the drug prevacid.
We have that there are 14 hydrogen atoms in prevacid. Thus;
14 * 0.48 * 6.02 * 10^23 = 4 * 10^24 atoms of hydrogen.
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PLEASE HELP ASAP!!
An iron refinery produces an iron ingot weighing 150.0 lb. (An ingot is a piece of relatively pure metal that is cast in a block.) If the iron is drawn into wire whose diameter is 7.50 mm, how many feet of iron can be obtained from the ingot? The density of iron is 7.87 g/mL. The cost of iron is $109 per metric ton. How much is this wire worth?
Element Q has three isotopes. It is 18.75% -318, 78.26% Q-319, and 2.99% Q-320; The masses of the isotopes are 317.98 amu, 318.98 amu, and 320.026 amu respectively. What is the average atomic mass of the element Q
Answer:
Explanation:
ye
During a UV-Visible spectroscopy experiment, a student notes a wavelength peak measurement at 280 nm. What region of the electromagnetic spectrum was this peak observed?
If during a spectroscopy experiment a student notes a wavelength peak measurement at 280 nm, then the region of the electromagnetic spectrum observed is the UV region.
What is the electromagnetic spectrum?The electromagnetic spectrum refers to all types of wavelengths that radiation can emit as light, which involves both visible light and also ultraviolet (UV) radiation.
In conclusion, if during a spectroscopy experiment a student notes a wavelength peak measurement at 280 nm, the region of the electromagnetic spectrum observed is the UV region.
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For a hydrogen atom, calculate the energy of the photon that would be emitted for the orbital transition of n(initial) = 5 to n(final) = 3. The Rydberg constant is 1.09678 x 10⁷ m⁻¹.
The energy of the photon is 1.5 * 10^-19 J
What is the Bohr model?According to the Bohr model of the atom, the atom is arranged in energy levels. It is possible for an electron to transition from a lower to a higher energy level by the gain of energy. The energy that is gained must be equal to the difference in energy between the lower and the higher energy levels of the atom.
No we know that we could use the Rydberg formula to obtain the wavelength of the photon that is emitted when an electron moves from a higher to a lower energy level with the emission of the energy that was taken in.
Thus;
1/λ = RH (1/n^2 final – 1/n^2 initial)
RH = 1.09678 x 10⁷ m⁻¹
n final = 3
n initial = 5
1/λ =1.09678 x 10⁷ (1/3^2 – 1/5^2)
1/λ = 1.09678 x 10⁷ (0.11 – 0.04)
λ = 1302 nm
E = hc/ λ
E = 6.6 * 10^-34 * 3 * 10^8/1302 * 10^-9
E = 1.5 * 10^-19 J
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PLEASE HELP!!!
Compare and contrast a scientific theory and a scientific law, and include an example of each.
Answer:
scientific is a study of things and scientific law is law
Explanation:
you can study scientific a ND and law
hshdfhdh
Answer:
Scientific theories and laws are both factual. However, scientific theories are statements that have been proven over and over again by dozens of scientists. For example, a theory would be that the solar system is heliocentric (planets revolve around the sun). Theories are also subject to change in the event of new technological innovations. Scientific laws are statements that are universal and are based on logic/math. These will not change because they describe what happens and they are rules. For example, Newton's laws of motion would be laws because they are rules of motion. Overall, scientific theories and laws describe why and what happens based on certain conditions and circumstances.
What Is The hypothesis for,What Effect Does Using Plant Food Have On Plant Growth?
Answer: If the amount of fertilizer applied to plants is increased, then plant growth (height) will increase. As the amount of fertilizer increases the plant growth increases.
Explanation: It's correct
Two of most unique elements on the periodic table are hydrogen and helium. What makes them so unique and removed from the other groups on the periodic table?
A:Unlike all other elements, hydrogen and helium are gases
B:Unlike all other elements, hydrogen and helium are not considered metals
C:Unlike all other elements, hydrogen and helium only have a maximum of 2 valence electrons
D:Unlike all other elements, hydrogen and helium have very limited properties
What makes hydrogen and helium so unique and removed from the other groups on the periodic table is that unlike all other elements, hydrogen and helium only have a maximum of 2 valence electrons (option C).
What properties of hydrogen and helium makes them unique?Hydrogen and Helium are two elements in the periodic table. They are the lightest elements in the periodic table.
Also, they both exist as gases at room temperature and are the two most common elements in the universe.
However, hydrogen and helium are removed from other groups of the periodic table. Thisis because hydrogen and helium atoms only have two electrons and the outermost energy level is the first energy level, hence, there can only be two valence electrons.
Therefore, what makes hydrogen and helium so unique and removed from the other groups on the periodic table is that unlike all other elements, hydrogen and helium only have a maximum of 2 valence electrons.
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BUFFERS BUFFERS AND BUFFER CAPACI
INTRODUCTION
LABORATORY SIMULATION
How to calculate the pH of a buffer solution
1) Calculate the pH of a solution prepared by dissolving 2.05 g of sodium acetate, CH3COONa, in 50.0 mL of 0.25 Macetic
acid, CH3COOH(aq). Assume the volume change upon dissolving the sodium acetate is negligible. K₂ of CH3COOH is
1.75 X 10-5.
pH =
The pH of a solution prepared by dissolving 2.05 g of sodium acetate in 50 mL of 0.25 M acetic acid is 5.06.
The above situation is a case of buffer solution.
The pH of a buffer solution can be calculated by the Henderson-Hasselbalch equation,
The equation is as follows:
pH = pKa + log[Salt]/[Acid]
In the above case, sodium acetate(CH3COONa) is the salt and acetic acid(CH3COOH) is the acid.
Putting [Salt] = 0.50 M and [Acid] = 0.25 M and pKa = 4.76 in the equation
pH = 4.76 + log[0.50]/[0.25]
pH = 4.76 + log2
pH = 4.76 + 0.30
pH = 5.06
Thus, the pH of a solution prepared by dissolving 2.05 g of sodium acetate in 50 mL of 0.25 M acetic acid is 5.06.
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What is 254 nm in meters? Submit answer in scientific notation using the format 0.00x10^0 (e.g. 0.000123 = 1.23x10^-4). Omit units and spaces.
What is the frequency of this irradiation? (Answer from question 1) Submit answer in scientific notation using the format 0.00 x 10^0 (e.g. 0.000123 = 1.23 x 10^-4). Omit units and spaces.
Nanometers is an SI subunit of length equal to 10-⁹ metres. It has a symbol of nm.
The conversion factor of metres to nanometers is as follows:
1 nanometres = 1 × 10-⁹ metres
Hence, 254 nanometers is equivalent to 2.54 × 10-⁷metres.
The frequency of a wave can be calculated using the following formula:
wavelength = wave velocity/frequency
frequency = 3 × 10⁸ ÷ 2.54 × 10-⁷
Frequency = 1.18 × 10¹⁵Hz
Therefore;
254nm is equivalent to 2.54 × 10-⁷metres. The frequency of a radiation that has a wavelength of 254nm is 1.18 × 10¹⁵HzLearn more about frequency and wavelength at: https://brainly.com/question/3639648
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Question 5
The process by which a gas condenses is referred to as
exothermic.
endothermic.
ectodermic.
exotic.
4. Study the flow diagram below the answer the questions that follow C Mg (a) Write the chemical formulae of products () A B (b) Write the equations for the reactions that form products (1) (11) C...... D and E
Answer:
where is flow diagram.....
.........
What is the density of a piece of metal that weighs 12 g and has a volume of 500 mL?
Answer:
0.024 g/mL
Explanation:
The denisty of a substance is a ratio comparing its mass per every 1 unit of volume. Therefore, if you have been given a mass in grams and a volume in milliliters, the unit for denisty (in this case) is g/mL.
Density = ? grams / ? mL
Density = 12 g / 500 mL
Density = 0.024 g/ 1 mL = 0.024 g/mL
A student wants to measure the volume of a rock. The student should measure
the volume using?
Answer:
To measure the volume of a large rock, fill a glass measuring cup up to one half with water. Put your large rock in and measure the new water level. Subtract the original half cup volume of water and the difference is the volume or space that your rock takes up.
Answer:
if the rock is small use a measuring cylinder
Explanation:
Please help me solve this
If 160. g of a radioactive iron (59Fe) is received in the lab today, what percentage of the original is left after 180 days?
If 160.0 g of radioactive iron (59Fe ) is received in the lab today, Then the percentage of the original left after 180 days is 6.25 %.
Radioactive elements are those elements which are made up of those atoms whose nuclei is unstable and emits radiations or undergoes radioactive decay to attain stability or to form stable nuclei.
Given -
t = 180 days
t1/2 = 45 days
So,
n = t = 180 = 4
t1/2 45
Amount of the remaining radioactive iron,
R = R°
2n
where, n = 4
R = 1 = 0.0625
R° 2₄
To calculate percentage of original sample -
percentage of original sample of iron = R x 100
R°
= 0.0625 x 100
= 6.25 %
After 180 days, or 4 half lives, the percentage of radioactive iron remaining is 6.25%.
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Write a balanced chemical equation based on the following description:
gaseous nitrogen and hydrogen react to form gaseous ammonia
The balanced chemical equation of a reaction between gaseous nitrogen and hydrogen to form gaseous ammonia is as follows; N₂ + 3H₂ → 2NH₃.
What is a balanced chemical equation?A chemical equation is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.
A chemical reaction is said to be balanced, in accordance with the law of conservation of matter, when the number of moles of each atom of elements on both sides of the equation are the same.
According to this question, gaseous nitrogen and hydrogen react to form gaseous ammonia. The balanced chemical equation is as follows:
N₂ + 3H₂ → 2NH₃
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