Answer:
See Below
Explanation:
mole weight of Au ( gold) = 196.97 gm
31.1 / 196.97 = number of moles of Au
Number of moles * Avagadro's Number = number of atoms
31.1 / 196.97 * 6.022 x 10^23 = 9.508 x 10^22 atoms
If the mass number of an atom is 29, and it has 13 protons and 13 electrons, what is the identity of this atom?
If the mass number of an atom is 29, and it has 13 protons and 13 electrons, the identity of this atom is Aluminum.
What is an atom?An atom is the smallest indivisible particle of an element which still retains its chemical identity.
An atom consists of a nucleus surrounded by electrons. The nucleus is made up of protons and neutrons.
The identity of a chemical element is determined by its electron and proton number, which is the same for a neutral atom.
According to this question, the atom of an element has 13 protons and 13 electron. This suggests that the atom is that of Aluminum.
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Question 2 of 35
Which two phrases describe ice storms?
A
A. Temperatures way below freezing
B. A large amount of snow falling
C. Temperatures near freezing
D. A large amount of ice forming
Please help!
An ice storm is a temperature below freezing resulting from large amount of snow falling, i.e., options A and B.
What is ice storm?Freezing rain causes ice storms. Raindrops travel into a tiny layer of below-freezing air near the earth's surface, where they freeze on contact with the ground, trees, automobiles, and other things.
Ice forms when cold rain freezes in contact with surfaces below the freezing point.
Thus, the correct options A and B.
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Identify the balanced chemical equation that represents a single displacement reaction.
CF 4 + 2Br 2 ⟶ CBr 4 + 2F 2
3H 2SO 4 + 2Al ⟶ Al 2(SO 4) 3 + 3H 2
CF 4 + Br 2 ⟶ CBr 4 + F 2
3H 2SO 4 + 2Al ⟶ Al 2(SO 4) 3 + H 2
3H₂SO₄ + 2Al₂(SO₄)₃ → Al₂(SO₄)₃ + 3H₂ is the balanced chemical equation that represents a single displacement reaction.
What is a balanced chemical equation?The equation in which the number of atoms of all the molecules is equal on both sides of the equation is known as a balanced chemical equation.
3H₂SO₄ + 2Al₂(SO₄)₃ → Al₂(SO₄)₃ + 3H₂
In this type of reaction, one substance is replacing another:
A + BC → AC + B
In a single displacement reaction, atoms replace one another based on the activity series. Elements that are higher in the activity series. Also, if the element that is to replace the other in a compound is more reactive the reaction will occur. If it is less reactive, there will be no reation.
In the first equation, fluorine is more reactive than bromine. Therefore, bromine cannot replace bromine.
In the second equation, the displacement is between hydrogen and aluminium. Hydrogen is lower in the activity series, this implies that aluminium will replace it.
Hence, 3H₂SO₄ + 2Al₂(SO₄)₃ → Al₂(SO₄)₃ + 3H₂ is the balanced chemical equation that represents a single displacement reaction.
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Select all the correct answers.
What do scientists use to communicate extremely small measurements?
scientific notation
unit prefixes
graduated cylinders
physical models
base units
Scientists use scientific notation to communicate extremely small measurements. Hence, option A is correct.
What scientific notation?Scientific notation is a way of writing very large or very small numbers.
Scientists use scientific notation to represent very small or very large numbers because this notation increases the
accuracy of measured quantities.convenience in using the numbers.the number of significant figures.precision of measurements.Hence, option A is correct.
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The process of seeping of water into the ground in called
Answer: Infiltration
Explanation: it is the process by which surface water, rainwater or snowmelt seeps into the ground
3. Humans discovered how to use fire and tools. How was this knowledge passed along to younger generations?
Communication skills were developed so knowledge could be passed along to younger generations.
Primitive knowledge was instinctive so that the basic skills of fire and tools came naturally to everyone.
Younger people were forced to spend long hours building fires and making tools.
O The younger generations were able to figure out how to use tools on their own.
Communication skills were developed so knowledge could be passed along to younger generations.
How knowledge will pass through generations?Knowledge will pass from one generation to another with the help of education. The skill people give education to their youngers about fire and tools. In this way, skills of fire and tools pass from one generation to another.
So we can conclude that communication skills were developed so knowledge could be passed along to younger generations.
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Answer:
A
Explanation:
The pressure of x ml of a gas was increased from 2 atm to 4 atm at constant temperture. what will be the new volume?
The new volume of the gas given the data from the question is 1/2X mL
Data obtained from the question
Initial volume (V₁) = X mL
Initial pressure (P₁) = 2 atm
New pressure (P₂) = 4 atm
New Volume (V₂) = ?
How to determine the new volume
The new volume of the gas can be obtained by using the Boyles’ law equation as illustrated below:
P₁V₁ = P₂V₂
2 × X = 4 × V₂
2X = 4V₂
Divide both side by 4
V₂= 2X / 4
V₂ = 1/2X mL
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Toothpaste contains Sodium fluoride which is used to prevent tooth decay. How many grams are in 1 mole NaF?
Answer:
0.24%
Explanation:
A toothpaste contains 0.24% by mass sodium fluoride (NaF) used to prevent dental caries and 0.30% by mass triclosan, C12H7Cl3O2, a preservative and antigingivitis agent. One tube contains 119 g of toothpaste. (6.4, 6.5) Components in toothpaste include triclosan and NaF.a. How many moles of NaF are in the tube of toothpaste?b. How many fluoride ions (F?) are in the tube of toothpaste?c. How many grams of sodium ion (Na+) are in 1.50 g of toothpaste?d. How many molecules of triclosan are in the tube of toothpaste?Solution 124CQStep 1 of 4:Given:Mass of toothpaste = 119 g. Mass percent of sodium fluoride (NaF) = 0.24%Mass percent of triclosan (C12H7Cl3O2) = 0.30%a. Here, we are asked to find the number of moles of NaF in the tube of toothpaste.Mass percent of sodium fluoride (NaF) = 0.24%First, let’s find the mass of NaF in the tube: = 119 g = 0.2856 grams Molar mass of NaF = 41.98 g/mol This means, 1 mol NaF = 41.98 g. So, the mole-mass factor is: and Therefore, number of moles of NaF will be: = 0.2856 g NaF = 0.00680 mol NaFHence, the number of moles of NaF in 119g toothpaste is 0.00680 moles. ________________
According to mole concept, there are 41.988 grams in 1 mole NaF that is sodium fluoride.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
Number of moles is given by the formula, mass/molar mass and hence mass= 1×41.988= 41.988 g.
Thus, there are 41.988 g in 1 mole NaF.
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HELP NEED DONE ASAPP BEFORE 11:59PM!!!!
Predict the total pressure in Container C if the initial pressure in Container A was tripled and. Container B was reduced by one-third then mixed in Container C.
Container A Oxygen 287 kPa
Container B Nitrogen 429 kPa
Container C Oxygen + Nitrogen
Pressure
=
P total
Answer:
I think B sorry if wrong
Explanation:
have a good day
If you add sucrose to catalase when testing for reactivity, do you expect to see a reaction?.
There is no reaction when you add catalase to sucrose.
What is sucrose?Sucrose is a disaccharide that consist of glucose and fructose. Both glucose and fructose are hexoses.
Owing to the fact that catalase is specific to sucrose, there is no reaction when you add catalase to sucrose.
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Concentrated HCl is 15 M (15 molar). A 500 mL quantity of this solution is diluted by adding water to give a final volume of 2.5 L. What is the molarity of the resulting solution
The molarity of the resulting solution obtained by diluting the stock solution is 3 M
Data obtained from the question Molarity of stock solution (M₁) = 15 MVolume of stock solution (V₁) = 500 mL Volume of diluted solution (V₂) = 2.5 L = 2.5 × 1000 = 2500 mL Molarity of diluted solution (M₂) =? How to determine the molarity of diluted solutionM₁V₁ = M₂V₂
15 × 500 = M₂ × 2500
7500 = M₂ × 2500
Divide both side by 2500
M₂ = 7500 / 2500
M₂ = 3 M
Thus, the volume of the resulting solution is 3 M
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if this strand is replicated what is the complementary strand that is produced
Answer:
During DNA replication, each of the two strands that make up the double helix serves as a template from which new strands are copied. The new strand will be complementary to the parental or “old” strand. Each new double strand consists of one parental strand and one new daughter strand.
Explanation:
hope it helps you
How many moles of O2 are formed from 1.252 g of HgO?
Moles of Hg
Given mass/Molar mass1.252/200.590.006mol2 moles produce 1 mol O2
1 mol produces 1/2mol O_2
0.006 mol produces
0.006(0.5)0.003molright 9 in a equation
Answer:
x+y = 12
Explanation:
shfb gfgjj ghjj dvgg ggggg ghggs ufac t g dgyyh
Organic compounds differ from inorganic compounds in that organic compounds generally have.
Answer:
carbon and hydrogen atoms
Explain the structure of an atom.
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An atom is a complex arrangement of negatively charged electrons arranged in defined shells about a positively charged nucleus. This nucleus contains most of the atom's mass and is composed of protons and neutrons (except for common hydrogen which has only one proton). All atoms are roughly the same size. A convenient unit of length for measuring atomic sizes is the angstrom (Å), which is defined as 1 x 10-10 meters. The diameter of an atom is approximately 2-3 Å.
In 1897, J. J. Thomson discovered the existence of the electron, marking the beginning of modern atomic physics. The negatively charged electrons follow a random pattern within defined energy shells around the nucleus. Most properties of atoms are based on the number and arrangement of their electrons. The mass of an electron is 9.1 x 10-31 kilograms.
One of the two types of particles found in the nucleus is the proton. The existence of a positively charged particle, a proton, in the nucleus was proved by Sir Ernest Rutherford in 1919. The proton's charge is equal but opposite to the negative charge of the electron. The number of protons in the nucleus of an atom determines what kind of chemical element it is. A proton has a mass of 1.67 x 10-27 kilograms.
The neutron is the other type of particle found in the nucleus. It was discovered by a British physicist, Sir James Chadwick. The neutron carries no electrical charge and has the same mass as the proton. With a lack of electrical charge, the neutron is not repelled by the cloud of electrons or by the nucleus, making it a useful tool for probing the structure of the atom.
Even the individual protons and neutrons have internal structure, called quarks. Six types of quarks exist. These subatomic particles cannot be freed and studied in isolation. Current research continues into the structure of the atom.
why do we not know what was on the far side of the moon until 1960's
Answer:
Like Earth, it gets plenty of sunlight. We don’t see the far side because “the moon is tidally locked to the Earth,” said John Keller, deputy project scientist for NASA’s Lunar Reconnaissance Orbiter project. “The moon does rotate, but it rotates at the same speed that it rotates around the Earth.”
Explanation:
The chemical colchicine is used in the production of karyotypes. Colchicine prevents spindle fibers from forming during the cell cycle. What is a result of preventing spindle fibers from forming?
The result of preventing spindle fibers from forming is mitotic division stops in metaphase and cannot proceed to anaphase.
What is colchicine?Colchicine is a drug use to remove swelling and decrease the amount of uric acid production.
It prevents the formation of spindle fibers during the cell cycle.
Thus, the correct option is C.
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How many moles of carbon dioxide are there in 52.06 g of carbon dixoide
Answer:
Moles of substance are defined ratio of the given mass of the substance to the molar mass of the substance.
Given :
The 52.06 grams of carbon dioxide.
To find :
The moles of carbon dioxide.
Solution:
The mass of carbon dioxide = 52.06 g
The molar mass of carbon dioxide = 44.01 g/mol
The moles of carbon dioxide:
1.183 moles of carbon dioxide are there in 52.06 g of carbon dioxide.
Explanation:
A solid chloride E which sublimes on heating reacted with an alkali F to give a choking gas G.G turns red litmus paper blue . identify E, F and G
Answer:
E:ammonium chloride
F:sodium hydroxide
G:ammonia
What is the volume of the sphere? 8 cm
Perform the following operation
and express the answer in
scientific notation.
9.80x10-3 + 1.60x10-4
[ ? ]x10
Answer:
11.40x10-7
Explanation:
9.80+1.60x10-3-4
11.40x10-7
how many valence electrons does sr2+ have
Answer:
8 valence electrons
Explanation:
PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
ITS B
Explanation:
MY CONSCIOUS MIND IS TELLING ME
Why are elements classified?
Which change to a DNA molecule would have the least effect on an organism? an addition to a base sequence at the beginning of a gene a deletion from a base sequence in the middle of a gene a substitution in a base sequence that does not code for a protein a substitution that creates a “stop” code in the middle of a gene
Answer:
Change in a single nitrogen base in the DNA sequence will not have any significant effect on the organism.So A: an addition to a base sequence at the beginning of a gene
Explanation:
This is known as point mutation and it does not have any significant change in the protein and it is least harmful type of DNA mutation.
Decomposition occurs when...
Answer:
Decomposition begins at the moment of death, caused by two factors: 1.) autolysis, the breaking down of tissues by the body's own internal chemicals and enzymes, and 2.) putrefaction, the breakdown of tissues by bacteria.
Explanation:
hope it will help you
1. Swimming pool manufacturers recommend maintaining the
pool chlorine concentration at 3.0 ppm. What is the mass of
chlorine in a pool containing 3.4 x 106 L of water? ™
A 3.4 × 10⁶ L swimming pool must have a mass of 1.0 × 10⁷ mg Cl₂ to maintain a concentration of 3.0 ppm.
What is "ppm"?"ppm" of "parts per million" is a unit of concentration equivalent to milligrams of solute per liters of solution.
A pool must maintain a chlorine concentration of 3.0 ppm (3.0 mg/L). The mass of chlorine in 3.4 × 10⁶ L is:
3.0 mg Cl₂/L × 3.4 × 10⁶ L = 1.0 × 10⁷ mg Cl₂
A 3.4 × 10⁶ L swimming pool must have a mass of 1.0 × 10⁷ mg Cl₂ to maintain a concentration of 3.0 ppm.
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Assume a parent isotope has a half-life of 100 million years. How old is a sample that
contains 15% of its original parent isotope?
250 million years
270 million years
200 million years
100 million year
Answer:
270 million
Explanation:
1/2 ^n = .15 (.15 is 15% in decimal)
log both sides
n log (1/2) = log (.15 )
n = 2.737 half lives
EACH half life is 100 million
2.737 * 100 million = 273.7 million
Classify each of the following as a homogeneous and heterogeneous mixture
Soda water, wood, air, soil, vinegar, filtered tea
Soda water, wood, air, soil, vinegar, filtered tea.
Answer:
Homogeneous mixtures : Soda water, vinegar and filtered tea. Heterogeneous mixtures : Wood and soil.