Answer: [tex]TiO_2[/tex] has higher percentage of oxygen by mass.
Explanation:
To calculate the mass percent of element in a given compound, we use the formula:
[tex]\text{Mass percent of oxygen}=\frac{\text{Mass of oxygen}}{\text{mass of compound}}\times 100[/tex]
1. Mass of oxygen in [tex]TiO_2[/tex] = [tex]\frac{32g}{80g}\times 100=40\%[/tex]
2. Mass of oxygen in [tex]ZnO[/tex] = [tex]\frac{16g}{81g}\times 100=19.8\%[/tex]
Thus [tex]TiO_2[/tex] has higher percentage of oxygen by mass.
The compound with the higher percentage of oxygen by mass is titanium dioxide.
Titanium dioxide, TiO2, has a molar mass of 79.866 g/mol and O2 has a molar mass of 32.
Percentage by weight of oxygen in TiO2 = 32/79.866 x 100
= 40.07%
Zinc oxide, ZnO, has a molar mass of 81.38 g/mol
percentage by weight of oxygen in ZnO = 16/81.38 x 100
= 19.66%
Thus, titanium dioxide has a higher percentage by weight of oxygen than zinc oxide.
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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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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.....
.........
Name an element in the second period (row) of the periodic table with six 2p electrons
Answer:
arsenic
Explanation:
So basically it can be seen that the element is arsenic. Yeah. And now we see the element which has 6, 2 p electrons and lies in the 2nd period. So that is basically now because if we observe the electronic configuration of now it has atomic number 10 and its electronic configuration is one has to to s to two P six.
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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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).
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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How many years ago and where did scientists figure out how the Earth was made?
Answer:
Earth formed in this manner about 4.54 billion years ago (with an uncertainty of 1%) and was largely completed within 10–20 million years. The solar wind of the newly formed T Tauri star cleared out most of the material in the disk that had not already condensed into larger bodies
Explanation:
Earth formed in this manner about 4.54 billion years ago (with an uncertainty of 1%) and was largely completed within 10–20 million years. The solar wind of the newly formed T Tauri star cleared out most of the material in the disk that had not already condensed into larger bodies
Answer:
More than 70 meteorites that have fallen to Earth have had their ages calculated by radiometric dating. The oldest of these are between 4.4 billion and 4.5 billion years old. Fifty thousand years ago, a rock hurled down from space to form Meteor Crater in Arizona.Scientists now think the Earth's story began around 4.6 billion years ago in a disk-shaped cloud of dust and gas rotating around the early sun, made up of material left behind after the sun's formation.
Explanation:
Earth is estimated to be 4.54 billion years old, plus or minus about 50 million years. Scientists have scoured the Earth searching for the oldest rocks to radiometrically date. In northwestern Canada, they discovered rocks about 4.03 billion years old.By measuring the age of rocks on the moon, and meteorites found on Earth, scientists estimate the Earth consolidated by 4.54 billion years ago.Formation. When the solar system settled into its current layout about 4.5 billion years ago, Earth formed when gravity pulled swirling gas and dust in to become the third planet from the Sun. Like its fellow terrestrial planets, Earth has a central core, a rocky mantle, and a solid crust.
PLS MARK AS BRAINLIEST GAVE MORE INFO THAN THE 1ST ANSWER
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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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:
AIf 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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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.
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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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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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
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)
(Each helium atom has two protons. Sketch models
of helium-3 and helium-4, which have approximate masses of 3 amu and 4 amu, respectively. Label and differentiate protons, neutrons, and
electrons in your models.
In the isotopes of Helium, Helium-3 has 2 electrons, 2 protons and 1 neutron whereas Helium-4 has 2 electron, 2 protons and 2 neutrons in it.
Isotopes are the atoms of same element having same atomic number but different mass number.
Mass number is represented as Z and atomic number is represented as A.
Atomic number = number of protons in the atom = number of electrons in the neutral state of the atom.
Mass number = number of protons + number of neutrons in the atom
so, number of neutrons can be calculated as = Atomic number - number of protons in it
For Helium-3
mass number = 3
and atomic number = 2
so number of electrons = number of protons = atomic number = 2
number of neutrons = mass number - number of protons
= 3-2 = 1
For Helium-4
mass number = 4
and atomic number = 2
so number of electrons =number of protons = 2
number of neutrons = mass number - number of protons = 4-2 = 2
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a stick of butter weighs 0.25lbs. what is the weight of the stick of butter in milligrams?
A stick of butter weighs 0.25lbs. The weight of the stick of butter in milligrams is 113398.1.
What are milligrams?Milligrams are the measurement quantity that is used to measure a substance in very minute quantities. It is the SI unit of mass. It is equivalent to one thousand grams.
lb is the symbol of a pound. It is used to measure an object in American and British systems of measurement. It is a value of weight.
1 lb = 453592 milligrams
0.25 lbs = 113398.1 milligrams
Therefore, the weight of the stick of butter in milligrams is 113398.1.
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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:
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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What is the frequency of this irradiation? (2.54x10^-7) 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.
The frequency of an irradiation with wavelength of 2.54 × 10-⁷ metres is 1.18 × 10¹⁵ Hz.
How to calculate frequency?The frequency of a radiation is the rate of occurrence of anything i.e. the relationship between incidence and time period.
The frequency of a wave can be calculated using the following formula;
λ = v/f
Where;
λ = wavelengthv = speed of lightf = frequencyAccording to this question, an irradiation with wavelength of 2.54 × 10-⁷ metres is given. The frequency can be calculated as follows;
2.54 × 10-⁷ metres × f = 3 × 10⁸ metres/seconds
f = 3 × 10⁸ ÷ 2.54 × 10-⁷
f = 1.18 × 10¹⁵ Hz
Therefore, the frequency of an irradiation with wavelength of 2.54 × 10-⁷ metres is 1.18 × 10¹⁵ Hz.
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Please help me solve this
Calculate 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.
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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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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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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A certain protein was found to contain 0.793% zinc by mass. Determine the minimum molecular mass of the protein.
A certain protein was found to contain 0.793% zinc by mass. The minimum molecular mass of the protein is 8264.46 grams.
What is molecular mass?Molecular mass is the sum of the all atoms of an element. The molecular mass can be calculated by checking the mass of the atom from the periodic table.
In 100 grams of proteins, we have, 0.793% zinc
The molar mass of zinc is 65.3820 g/mol
0.793 / 65.3820 = 0.0121 moles of zinc
So, in 100 grams of protein
1 mole = 100 / 0.0121 = 8264.46 grams / mol
Thus, the minimum molecular mass of the protein is 8264.46 grams.
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a cube of iron pyrite is 0.31 cm on each side and has a mass of 0.040g. what is the density of the sample?
The density of the iron pyrite cube is 1.343 g/cm³.
Given,
Side of iron pyrite cube = 0.31 cm
Mass of iron pyrite = 0.040 g
The volume of iron pyrite cube = s³ cm³
Or, volume = 0.029791 cm³
We have to find the density of the sample.
Density is defined as the mass per unit volume. Or, it is the ratio of mass to the volume of the substance.
Using the formula for density, we get,
Density = mass/volume
Or, density = 0.40/0.029791
Or, density = 1.343 g/cm³
Hence, the density of the iron pyrite cube is 1.343 g/cm³.
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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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A piece of metal has a mass of 114g and a volume of 10.0 cm³. What is the density of the metal?
Answer:
14.4g/cm³
Explanation:
114/10=14.4g/cm³
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?