Answer:
D. 82
Explanation:
Answer:
see below
Explanation:
1. 138
2. the conversion of an atom of one element into a different element through nuclear changes
3. A nuclear equation is balanced according to mass number. A chemical equation is balanced according to the total mass before and after the change.
4. 82
5. Some of the matter is converted to energy.
[quizlet: captncrun]
What are the valence electrons of an atom?
A.The electrons that remain closest to the nucleus
B.The electrons that an atom gains when it becomes an anion
C.The electrons that an atom loses when it becomes a cation
D.The electrons in the highest occupied energy level
Answer:
D
Explanation:
Valence electrons are the electrons in the highest occupied principal energy level of an atom.
Why do atoms exchange or share electrons during bonding?
to obtain a full outer electron shell
to attract an ion with the opposite charge
to become neutral
to have eight inner level electrons
Answer:
to obtain a full outer shell
Explanation:
The atoms of some elements share electrons because this gives them a full valence shell. ... If atoms can't achieve a full outer shell by transferring electrons, they resort to sharing. In this way, each atom can count the shared electrons as part of its own valence shell. This sharing of electrons is covalent bonding.
Atoms generally exchange or share electrons during bonding because they want to obtain a full outer electron shell. Thus, the correct option for this question is A.
What is Chemical bonding?Chemical bonding may be defined as a type of interaction that is significantly accomplished through the association of atoms into molecules, ions, crystals, and other stable species that make up familiar substances.
According to the context of this question, the atoms of some elements typically transfer their electrons to the other elements in order to achieve a fully filled outermost shell.
If they do not have a tendency of transferring, they follow a different mechanism of sharing their electrons. The sharing of electrons gives rise to the formation of covalent bonding.
Therefore, atoms generally exchange or share electrons during bonding because they want to obtain a full outer electron shell. Thus, the correct option for this question is A.
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In what ways are the electronic structures of the group 14 (4A) elements similar? In what ways are they different?
Elements in the same group have the same number of outermost electrons.
What is electronic structure?Electronic structure refers to the arrangement of electrons in the atom. We know that elements in the same group have the same number of outermost electrons.
However, as we come down the group, the inner shells of the elements in group 14 become bigger and the outermost shells are now found at higher energy levels such as n=4 or 5.
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1.The chemical or substance used to start a reaction are called
Answer:
Reactants
Explanation:
The substance (or substances) initially involved in a chemical reaction are called reactants or reagents.
Answer:
The substance (or substances) initially involved in a chemical reaction are called reactants or reagents. ... Chemical reactions are described with chemical equations, which symbolically present the starting materials, end products, and sometimes intermediate products and reaction conditions.
Explanation:
Hope this helps...
significant figures and scientific notation practice.
Answer:
11: 4
12: 3
13: 1
17: 3.000060
18: 5.0 x 10^2
19: 5.0 x 10^6
Explanation:
11: digits between 1&9 are always signifigant even if there are zeros between them
13: Zeros after the decimal do not count unless they represent an exact measurement
18: The decimal point moves forward 2 units so 10^2
Is this equation balanced? Explain why the equation S+3O2 → SO3 is balanced or is not balanced. Use four different words from the word bank to earn (4 points).
We can check if the equation is balanced by comparing the number of atoms of each element on the reactant and product sides. The reaction is only balanced if the number of atoms of each element is equal.
S + 3O₂ → SO₃
Reactant Product
S 1 1
O 6 3
∴ the equation is UNBALANCED since the number of atoms of oxygen on the reactant side is greater than that of the product.The balanced equation would be 2 S + 3O₂ → 2SO₃
Reactant Product
S 2 2
O 6 6
PLEASE QUICK I NEED HELP!!!!! :(
List these drinks in order of kinetic energy, starting with the drink whose particles have the highest kinetic energy.
hot chocolate, water, juice, milk
hot chocolate, juice, milk, water
water, milk, juice, hot chocolate
water, hot chocolate, juice, milk
Water
Milk
Juice
Hot choclate
Answer: The answer is B). Hot Chocolate, Juice, Milk, Water.
Explanation: For the second row, I put the temperature (in °C) in the descending order that looks like this: 50°C, 40°C, 35°C, 15°C.
I hope that my answer is very helpful to your own question about listing these drinks in descending order by starting with the drink whose particles have the highest kinetic energy, please mark me as Brainliest and have a great P.A. Day and weekend! :D
Sincerely,
Jason Ta,
The ambitious of Brainly and the role of The TDSB and WHCI Student of the high school.
Studying the brightness of a star can help scientist determine what part of the life-cycle a star is in.
Answer:
yes
Explanation:
This is my almost last question plsss help
Answer:
The Government did not encourage Confucius' philosophy until more than 350 years after Confucius first began teaching.
and
Some kinds of Confucianism we're influenced by other philosophies.
Use metric and U.S. conversion factors to solve the problem.
Question - If a student is 175 cm tall, how tall is the student in meters?
Explanation:
100cm = 1m
1cm=1/100 m
175cm = 175/100 m = 1.75m.
hope this helps you.
If a student is 175 cm tall, then according to the metric system the same student is 1.75 m tall.
What is a Metric system?A metric system may be defined as a type of system that significantly weighs and measures the mass and distance respectively in which the meter is the unit of length and the kilogram is the unit of weight.
A metric system is a standard system of measurement which utilizes the meter, liter, and gram as base units of length for distance, capacity for volume, weight for mass, etc.
According to the question, the height of a student in cm = 175 cm.
Then, from the general conversion rule,
1 meter = 100 cm.
1 cm = 1/100 meter.
175 cm. = 175/100 = 1.75 meters.
Therefore, if a student is 175 cm tall, then according to the metric system the same student is 1.75 m tall.
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the half-life of roentgenium -281 is 17 seconds,if 10 grams are left after 85 seconds,how many grams were initially in the original sample?
during a chemical reaction when the products of that reaction require less potential energy describe what happens to the surroundings?
why is it important to select a good stationary phase
Selectivity is relatively easy to alter, with mobile phase composition and stationary phase being the primary means of adjustment. The hydrophobicity, polarity and nature of the chosen stationary phase all play a crucial role in analyte interaction and directly affect the selectivity of a separation.
In chromatography, it is important to select a good stationary phase so as to ensure proper separation of components.
What is chromatography?Chromatography is a separation technique which is generally used for separating substances based on their solubilities. The technique makes use of two phases the mobile phase and the stationary phase.
The components are separated from each other based on their solubility in the mobile phase. Component which is least soluble does not travel along the mobile phase while component which is highly soluble travels with the mobile phase.
The difference in the solubility of the components is measured with the reference to the solvent front and is expressed in terms of Rf value.Chromatography finds application in forensics, separation of organic compounds,etc.
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NEED ANSWER ASAP
Concerning chromatography, why do different colors in the ink separate?
A)Some colors had a greater repulsion for the paper or water. The colors that had a greater repulsion for the paper moved faster, and those with a greater repulsion for the water moved slowly up the paper.
B)Some colors had a greater affinity for the paper or water. The colors that had a greater affinity for the water moved faster, and those with a greater affinity for the paper moved slowly up the paper.
C)Some colors had a greater repulsion for the paper or water. The colors that had a greater repulsion for the water moved faster, and those with a greater repulsion for the paper moved slowly up the paper.
D)Some colors had a greater repulsion for the paper or air. The colors that had a greater affinity for the air moved faster, and those with a greater affinity for the paper moved slowly up the paper.
E)Some colors had a greater affinity for the paper or water. The colors that had a greater affinity for the paper moved faster, and those with a greater affinity for the water moved slowly.
Substances that have greater affinity for the solvent travel faster while the substance that have greater affinity for the paper travel more slowly.
Chromatography involves a mobile phase and a stationary phase. The mobile phase is the solvent that carries the mixture. while the stationary phase is the medium that performs the actual separation
The speed with which components of the ink moves up the paper depends on its affinity for the paper or the water.
The different colors in the ink separate because some colors had a greater affinity for the paper or water. The colors that had a greater affinity for the water moved faster, and those with a greater affinity for the paper moved slowly up the paper.
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1. What is the name of the metal which exists in liquid state at room temperature?
(a) Sodium
(b) Potassium
(c) Mercury
(d) Bromine
2. Heterogeneous mixture in which the solute particles do not dissolve and remain suspended throughout the solvent and the solute particles can be seen with the naked eye is known as:
(a) Colloidal solution
(b) Solution
(c) Suspensions
(d) both (b) and (c)
3. In tincture of iodine, find the solute and solvent?
(a) alcohol is the solute and iodine is the solvent
(b) iodine is the solute and alcohol is the solvent
(c) any component can be considered as solute or solvent
(d) tincture of iodine is not a solution
4. A pure substance which is made up of only one kind of atom and cannot be broken into two or more simpler substances by physical or chemical means is referred to as ?
(a) a compound
(b) an element
(c) a molecule
(d) a mixture
Answer:
1. mercury.
2. suspensions.
3.iodine is the solute and alcohol is the solvent.
4. A element.
True or false chemistry. No links.
pliz answer 1 & 2 .... I'll tag best answer brainliest .... no spamming
1,chlorine ions
2,sodium chloride
when using vacuum filtration which type of tubing is best?
Answer:
The filter flask and the vacuum trap consist of heavy-walled glassware. You should use thick-walled tubings as well. Normal tubing that you use as water hoses will collapse under vacuum.
For vacuum filtration, thick walled tubings are best as they can withstand the pressure which is applied during filtration.
What is vacuum filtration?It is a filtration technique which works faster .This is because water is suck out the air in the vacuum flask and Buchner funnel by flowing it through the aspirator.
Filter at the bottom separates the solids from the liquids.Solid residue at top of funnel can be easily dried. The filtration takes place effeciently in presence of vacuum .
There is a rubber conical seal which ensures that the apparatus is hermetically closed,maintains vacuum in apparatus and avoids physical points of stresses.
Vacuum filtration is faster than gravity filtration and is more efficient leading to purer liquid. It is of much importance in crystallization.
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Which describes an atom that has fewer neutrons than protons and more electrons than protons?
A. negative compound
B. positive compound
C. positive ion
D. negative ion
When a substance is soluble it:
A. can dissolve any amount into the liquid.
B. can dissolve only a specific amount into the liquid, determined by its solubility.
C. can dissolve only a specific amount into the liquid, determined by the liquid's solvent point.
D. can dissolve any amount into the liquid, as long as the liquid is being heated.
When a substance is soluble it can dissolve only a specific amount into the liquid, determined by its solubility. Hence, option B is correct.
What is the solute?A solute is something being dissolved, a solvent is a thing dissolving the item, and the solution is the mixture of the two items.
Solubility is a term used to describe how readily a substance can be dissolved in a solvent to form a solution. Thus, a substance is said to be soluble if it dissolves completely in a solvent and insoluble if it doesn't dissolve or only dissolves partially.
Hence, when a substance is soluble it can dissolve only a specific amount into the liquid, determined by its solubility.
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Pretest: Chemical Reactions
Submit Test
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Select the correct answer.
Which coefficient of O, is needed to balance the equation C3Hg+ 02 - 3C02 + 4H2O?
OA. 2
OB. 3
O c. 5
OD 6
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The coefficient of oxygen is five which is needed to balance the given chemical equation and equation is C₃H₈ +5 O₂[tex]\rightarrow[/tex] 3 CO₂ +4 H₂O.
Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
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Particle A has very little mass in comparison to Particle B. Both particles are in the same atom. Which is the best conclusion about Particles A and B?
A) They have the same charge.
B) They are located in the nucleus together.
C) Particle A has a positive charge, and Particle B is neutral.
D) Particle A orbits the nucleus, and Particle B is located in the nucleus.
Answer:
A) They have the same charge.
B) They are located in the nucleus together.
C) Particle A has a positive charge, and Particle B is neutral.
D) Particle A orbits the nucleus, and Particle B is located in the nucleus.
Explanation:
Calculate the volume of a clear liquid that has a mass of 20 g and a density of 15.77 g/mL.
Answer:
20 g g/mL. 15.77
Explanation:
i think i answer it
bnmmmmmmmxsdcwwegvwwfdvsdv
Answer:
bnmmmmmmmxsdcwwegvwwfdvsdv
3. How does
photosynthesis affect
your daily life?
Answer:
to create oxygen and energy in the form of sugar
Explanation:
photosynthesis is the process by which plants use sunlight, water, and carbon dioxide
Which option would be an appropriate model of nuclear fusion?
A adding a drop of water to a glass of water
B sewing one piece of fabric to another
C mashing two marshmallows together
D putting a puzzle together
Mashing two marshmallows together can be an appropriate model to explain nuclear fusion.
Nuclear fusion is the reaction that occurs when two or more light elements combine to form heavier elements with the release of energy.
Nuclear fusion reactions occur mainly in the production of stars and the main-sequence star, The Sun by the fusion of hydrogen nuclei into helium.
Therefore,The following cannot be a model of Nuclear fusion, because they do not follow the basic concept of nuclear fusion which two light nuclei react to form a single heavy nuclei.
Adding a drop of water to a glass of waterSewing one piece of fabric to anotherPutting a puzzle togetherMarshing two marshmallows together can be a good model to explain nuclear fusion because it follows the basic concept of nuclear fusion
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Answer:
mashing two marshmallows together
Explanation:
i've taken the test
Describe how the particles in a substance are represented in particle theory.
Answer:
The particle theory of matter is a model that describes the arrangement and movement of particles in a substance. The model is used to explain the physical properties of solids, liquids and gases. Particle arrangement and movement
Explanation:
How many moles of carbon atoms are there in
5g of carbon?
Answer:
12 atoms of carbon
Explanation:
(6.023X10^23)/12 atoms of Carbon.
There are 0.42 moles of carbon atoms in 5g of carbon.
HOW TO CALCULATE NUMBER OF MOLES:The number of moles in a substance can be calculated by dividing the mass of the substance by its molar mass. That is;no. of moles = mass (g) ÷ molar mass (g/mol)
According to this question, the mass of carbon is 5g. The molar mass of carbon is 12g/mol.No. of moles = 5g ÷ 12g/mol
No. of moles = 0.42moles
Therefore, there are 0.42 moles of carbon atoms in 5g of carbon.
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Describe the endogenous pathways of cholesterol metabolism.
Explanation:
Endogenous pathway for lipid metabolism: VLDL is formed in the liver from triglycerides and cholesterol esters. ... In the liver, LDL is converted into bile acids and secreted into the intestines. In non hepatic tissues, LDL is used in hormone production, cell membrane synthesis, or stored.
A container holds 0.500 qt if liquid. how many mL of lemonade will it hold