2. The two naturally occurring isotopes of hydrogen are hydrogen-1 ( 1.00783 amu; 99.9885 percent) and hydrogen-2 (2.01410 amu; 0.0115 percent). What is the average atomic mass of hydrogen?
A. 1.0079 amu
b. 1.0097 amu
c. 1.0309 amu
D. 1.5110 amu
Answers
Answer:
1.0079 g/mol
Explanation:
99.989% / 100% = 0.99989 hydrigen-1 , 0.0115% / 100% = 0.000115 hydrogen-2
0.99989 x 1.0078 = 1.0077 , 0.000115 x 2.0141= 0.000232
1.0077 + 0.00023
Answer: 1.0079
Related Questions
How does the velocity of a falling object change over time?
Answers
consider three elements A B and C all of which have atomic numbers of less then 20. The atomic number of A is x, and the atomic number of B is three less than the atomic number of A
Element A forms cations with formula A+ and reacts with element C to form a solid substance with the formula AC
What is element A
Which group does element C belong to
Answers
Answer:
LiH
A is lithium
group 1 or 7
what is a chemical reaction? what is a chemical reaction? when a liquid undergoes a phase change and produces a solid when a new element is formed by rearranging nucleons when one or more new compounds are formed by rearranging atoms when two solids mix together to form a heterogeneous mixture when two liquids mix to form a homogeneous mixture
Answers
A chemical reaction is a procedure in which one or extra substances, additionally known as reactants, are converted to 1 or extra unique materials, called products.
A chemical reaction is a procedure in which reactants react chemically and convert into products by means of chemical transformation. as an example, respiration, we inhale oxygen which reacts with glucose and produces carbon dioxide, water and energy. The response is given. C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy.
Chemical reactions arise when chemical bonds between atoms are fashioned or broken. The substances that pass into a chemical response are called the reactants, and the materials produced at the cease of the reaction are referred to as the products.
The 5 basic sorts of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion. Reading the reactants and products of a given reaction will let you area it into such a classes.
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A particle with a mass of 1.00 kg is oscillating with simple harmonic motion with a period of 1.00 s and a maximum speed of 1.00 103 m/s. Calculate (a) the angular frequency and (b) the maximum displacement of the particle.
Answers
The angular frequency of the oscillating particle is 6.28 rad/s. The maximum displacement of the particle is 0.125 m.
To calculate the angular frequency of the oscillating particle, we can use the formula: angular frequency (ω) = 2π / period (T) Substituting the given values, we get: ω = 2π / 1.00 s = 6.28 rad/s
To calculate the maximum displacement of the particle, we can use the formula: maximum displacement (A) = maximum speed (vmax) / angular frequency (ω) Substituting the given values, we get: A = 1.00 x 10^3 m/s / 6.28 rad/s = 0.125 m
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1) A car is traveling down the highway for 12 hours and goes a
distance of 378 kilometers. What is the average speed of the car?
Answers
Answer:
31.50 km/hrExplanation:
The average speed of the car can be found by using the formula
\(s = \frac{d}{t} \\ \)
d is the distance
t is the time taken
From the question we have
\(s = \frac{378}{12} = \frac{63}{2} \\ \)
We have the final answer as
31.50 km/hrHope this helps you
Choose all that apply for raft spiders.
question 9 options:
raft spider's legs have a waxy surface that repels water
raft spiders sprint along submerged plants to catch underwater prey.
raft spider's light weight and large surface area allow it to walk on water.
raft spider's heavy weight and small surface area allow it to walk on water
Answers
Raft spider's light weight and large surface area allow it to walk on water.
What are raft spiders?Raft spiders are a specie of siders that can move on the surface of water. They are found around the north-western and central Europe.
The following apply to the raft spiders;
raft spider's legs have a waxy surface that repels waterraft spider's light weight and large surface area allow it to walk on water.Learn more about raft spiders:https://brainly.com/question/11416236?
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Why do humans feel so attached in relationships? What is the reason?
Answers
Answer:
We attach when we are convinced that we are incapable of healing ourselves or giving ourselves what we really want and need.
Explanation:
Hope you get right
CaCl2
Ca +
CI2
Balance this equation
Answers
To balance Ca + Cl2 = CaCl2 you'll need to be sure to count all of atoms on each side of the chemical equation.
Once you know how many of each type of atom you can only change the coefficients (the numbers in front of atoms or compounds) to balance the equation for Calcium + Chlorine gas.
While visiting his uncle's farm, Derek learned that horses and donkeys are two different species. Based on this
information, what can Derek infer about horses and donkeys?
Horses and donkeys cannot survive in the same
environment.
Horses and donkeys produce fertile offspring.
Horses and donkeys are members of the same
population.
Horses and donkeys are members of different
populations.
Answers
While visiting his uncle's farm, Derek learned that horses and donkeys are two different species. Based on this information, Derek can infer that horses and donkeys are members of different populations.
Since horses and donkeys are different species, they belong to different populations. A population refers to a group of individuals of the same species that live in the same area and can interbreed. While horses and donkeys can mate, their offspring, known as mules, are usually infertile.
This means that mules cannot produce offspring of their own, which indicates that horses and donkeys are not members of the same population. In contrast, if they were members of the same population, they would be able to produce fertile offspring. Therefore, Derek can infer that horses and donkeys are members of different populations.
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Chemical reactions do not create or destroy matter but simply rearrange it. which example is the correct completed equation for this reaction?
Answers
The correct complete equation examples for the conservation of mass law are:
4Fe + 3O₂ ⇒ 2Fe₂O₃H₂ + Cl₂ ⇒ 2HClAccording to the law of conservation of mass, the mass in a isolate system is neither created nor destroyed but can be transformed from one form to another.
In a chemical reaction the reactants mass must be equal to products mass in an energy thermodynamic process.
Examples:
The carbon atom can changes from a solid structure to a gas but its mass is not destroyed. In the reaction 4Fe + 3O₂ ⇒ 2Fe₂O₃ when the four parts of Iron is oxidized with the 3 parts of oxygen they created a new substance that not only contains the mass of iron but also the mass of oxygen.In the reaction H₂ + Cl₂ ⇒ 2HCl when the hydrogen and the chlorine react they created a new substance called Hydrochloric acid.What is chemistry?Is the science that study the properties, compositions and structure of the elements and compounds and the ways in which they interact combine and change.
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According to the
graph, what happens
to the concentration
of A over time?
Concentration (M)
Reaction: 2A A₂
Time (sec)
A. It decreases and then levels out.
B. It decreases consistently.
C. It increases and then levels out.
D. It increases consistently.
Answers
The concentration of A decreases and then levels out. Option A
How does concentration of the reactant change?
In many chemical reactions, a reactant is consumed as the reaction progresses, leading to a decrease in its concentration over time. The reactant molecules are transformed into products, and as the reaction proceeds, the concentration of the reactant gradually diminishes.
At equilibrium, the concentrations of both reactants and products remain relatively constant over time, although they can coexist.
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What mass of hclo4 should be present in 0. 600 l of solution to obtain a solution with each of the following ph values?.
Answers
The mass of HClO₄ required to produce the desired pH in a 0.600 L solution can be calculated using the Henderson-Hasselbalch equation and the molecular weight of HClO₄.
The Henderson-Hasselbalch equation relates the pH of a solution to the acid dissociation constant (pKa) and the ratio of the concentrations of the acid (HA) and its conjugate base (A-). For HClO₄, pKa is approximately -7.2. Therefore, [A-]/[HA] can be solved for using the rearranged Henderson-Hasselbalch equation: [A-]/[HA] = 10^(pH - pKa).
For example, to obtain a solution with pH = 1.0, [A-]/[HA] = 10^(1.0 - (-7.2)) = 7.94 x 10^8. Assuming that the total volume of the solution is 0.600 L, and that the desired concentration of ClO4- is equal to the concentration of HClO₄, which is equal to [HA], then [HA] = 0.600 L / (1 + 7.94 x 10^8) = 7.54 x 10^-10 M. The mass of HClO₄ required to produce this concentration can be calculated using the molecular weight of HClO₄: 7.54 x 10^-10 mol/L x 100.46 g/mol = 7.57 x 10^-8 g, or 0.0757 mg.
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32.30 mL of 0.220 M H2SO4(aq) are titrated with 46.30 ml of a NaOH solution. What is the molarity of the NaOH(aq)? Show your work. 32,3004,220m) = (46.30 mL/CM). 46-30 m 46.30 mL
Answers
The molarity of the NaOH(aq) solution is 0.156 M.
The balanced equation for the reaction between sulfuric acid and sodium hydroxide is H₂SO₄(aq) + 2NaOH(aq) → Na₂SO₄(aq) + 2H₂O(l). From the balanced equation, it can be deduced that the mole ratio of NaOH to H₂SO₄ is 2:1. Hence, the moles of H₂SO₄ reacted = Molarity of H₂SO₄ × Volume of H₂SO₄ used in liters = 0.220 M × 0.03230 L = 0.007106 moles.
Using mole ratio, the moles of NaOH reacted = 2 × 0.007106 = 0.01421 moles. Molarity of NaOH = Moles of NaOH / Volume of NaOH used in liters= 0.01421 moles / 0.04630 L = 0.306 M or 0.156 M (rounded off to three significant figures). Thus, the molarity of the NaOH(aq) is 0.156 M.
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how can we predict if a single replacement reaction will occur
Answers
A single replacement reaction is a type of chemical reaction that takes place when one element in a compound is replaced by another element. In other words, in this reaction, one element is replaced by another element. There are a few ways to predict whether or not a single replacement reaction will occur.
These ways are explained below: Paying Attention to ReactantsThe first way to predict if a single replacement reaction will occur is by paying attention to the reactants. In a single replacement reaction, a more reactive element will replace a less reactive element. For example, if a metal element is mixed with an aqueous solution that contains ions of another metal, a single replacement reaction will occur if the metal in the solid state is more reactive than the metal in the solution state. For instance, if you put zinc in copper sulfate, a reaction will occur because zinc is more reactive than copper. Therefore, it will replace copper, producing zinc sulfate and copper.Using the Activity SeriesAnother way to predict if a single replacement reaction will occur is by using the activity series. The activity series is a list of metals and their ability to replace other metals from their compounds. This list is arranged in order of decreasing activity. Therefore, if a metal is more active than another metal on the activity series, it will replace that metal from its compound. For example, if you put magnesium in silver nitrate, a reaction will occur because magnesium is more reactive than silver. Therefore, magnesium will replace the silver, producing magnesium nitrate and silver. If the metal is less active than another metal on the activity series, no reaction will occur.Using Electrochemical SeriesThe electrochemical series is another way to predict if a single replacement reaction will occur. The electrochemical series lists the elements in order of their standard reduction potentials. A metal with a higher reduction potential will replace a metal with a lower reduction potential from its compound. For instance, if you put copper in magnesium sulfate, no reaction will occur because copper has a lower reduction potential than magnesium. Therefore, magnesium will not replace copper from its compound.
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Sewage sludge in the united states contains a mixture of dangerous chemicals that include human waste and __________.
Answers
Sewage sludge in the United States contains a mixture of dangerous chemicals that include human waste and various contaminants.
These contaminants can include heavy metals (such as lead, mercury, and cadmium), pathogens (such as bacteria and viruses), pharmaceuticals, pesticides, and other toxic substances. The specific composition of contaminants in sewage sludge can vary depending on factors such as the source of the sewage and the treatment processes it has undergone. Proper treatment and disposal of sewage sludge are important to minimize the potential environmental and health risks associated with these hazardous substances.
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A chemical equation is balanced when the number of each
type of ____ is the same on both sides of the equation.
Answers
Answer:
a chemical equation is balanced when the number of each type of atom is the same on both sides of the equation.
Explanation:
A chemical equation is considered to be properly balanced when the number of each type of atom is the same on both sides of the chemical equation.
What is a chemical equation?
A chemical equation is typically used in chemistry to represent the chemical reaction between two (2) or more chemical elements.
What is a balanced equation?
A balanced chemical equation can be defined as a chemical equation wherein the number of atoms on the reactant (left) side is equal to the number of atoms on the product (right) side.
This ultimately implies that, the following must be in place for a balanced chemical equation:
Equal number number of each type of atom on both sides of the chemical equation.A balanced charge on each atom.Sum of the masses of the chemical elements or chemical compounds in the chemical equation are properly balanced.Ideally, the first step in balancing a chemical equation is to count the number of atoms in the reactant and product side of the chemical equation.
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Number of moles in 31.99g O2
And 176.8g NaCl
Answers
#O_2
\(\\ \sf\longmapsto No\:of\;moles=\dfrac{Given\:mass}{Molar\:mass}\)
\(\\ \sf\longmapsto No\:of\:moles=\dfrac{31.99}{32}\)
\(\\ \sf\longmapsto No\:of\:moles\approx 1\)
#NaCl
\(\\ \sf\longmapsto No\:of\:moles=\dfrac{176.8}{58.5}\)
\(\\ \sf\longmapsto No\;of\:moles=3mol\)
true or false Stoichiometry is a chemist's version of following a recipe.
Answers
True, stoichiometry can be considered a chemist's version of following a recipe. Just like a recipe, stoichiometry involves precise measurements and proportions to achieve the desired outcome.
In chemistry, stoichiometry is the study of the quantitative relationships between reactants and products in a chemical reaction. It involves balancing chemical equations, determining the limiting reactant, and calculating the amount of product formed or reactant needed.
This process is crucial in many industries such as pharmaceuticals, agriculture, and materials science, as it allows for the efficient and accurate production of desired substances. Just as a cook needs to follow a recipe to create a delicious meal, a chemist needs to use stoichiometry to create the desired products in a chemical reaction.
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Describe how detergents (e. G. Washing powder) are able to
remove greasy stains from our clothes.
The water in Gothenburg is "soft". What is meant by soft water and why do we need
to use less detergent in soft water areas and more detergent in hard water areas.
Answers
Detergents, such as washing powder, are able to remove greasy stains from clothes by breaking down the grease into smaller, more manageable particles.
Detergents contain molecules with a hydrophobic (water-repelling) end and a hydrophilic (water-attracting) end. When added to water, the hydrophobic ends of the detergent molecules attach to the grease and oil on the clothes, while the hydrophilic ends remain in the water. This causes the grease and oil to be pulled away from the clothes and suspended in the water, making them easier to wash away.
Water is considered "soft" when it contains low levels of dissolved minerals such as calcium and magnesium. Hard water contains high levels of these minerals, which can cause buildup on fixtures and appliances over time. When using detergents in hard water, the minerals in the water can interfere with the detergent's ability to lather and clean effectively, which means that more detergent is needed to achieve the same results. In contrast, soft water does not have this issue and less detergent is needed to achieve the same cleaning power.
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If 80 g of magnesium react with 100 g of sulphur, how many grams of magnesium sulphide are formed
Answers
Approximately 175.3 grams of magnesium sulfide are formed. To determine the number of grams of magnesium sulfide formed, we need to first determine the limiting reactant.
To do this, we calculate the number of moles for each reactant. The molar mass of magnesium is 24.31 g/mol, and the molar mass of sulfur is 32.06 g/mol.
For magnesium, we have:
80 g / 24.31 g/mol = 3.29 mol
For sulfur, we have:
100 g / 32.06 g/mol = 3.12 mol
From the calculation, we can see that sulfur is the limiting reactant, as it produces fewer moles than magnesium.
The balanced equation for the reaction between magnesium and sulfur is:
Mg + S --> MgS
According to the balanced equation, one mole of magnesium reacts with one mole of sulfur to form one mole of magnesium sulfide.
Since sulfur is the limiting reactant, we can conclude that 3.12 moles of magnesium sulfide are formed.
To determine the mass of magnesium sulfide formed, we can multiply the number of moles of magnesium sulfide by its molar mass. The molar mass of magnesium sulfide is 56.30 g/mol.
So, the mass of magnesium sulfide formed is:
3.12 mol x 56.30 g/mol = 175.3 g
Therefore, approximately 175.3 grams of magnesium sulfide are formed.
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I need help with my science project someone help me answer it!
Answers
Answer:
food
Explanation:
Earth's surface is shaped and changed in many ways. Which of these can shape Earth's surface?
water
wind
ice
gravity
organisms (living things)
the sun
none of these
all of the above
Answers
Explanation:
Water- moves across soil and breaks down pieces of rocks
Wind- can blow materials around, such as rocks or sand. Also it can dry out soil.
Ice- carries broken rocks or soil to different places and can cause glacier erosion.
Gravity- thinking about it, earth is the one place with gravity so if gravity changed it can cause objects to move. Also it determines the shape of the earth because the center has more gravitational pull. This gives it a very round shape.
Organisms- more animals means increase of destruction of plants, which can lead to faster erosion.
Sun- the sun is very important. If the earth didn’t get any sunlight there wouldn’t be any life on the planet itself. Which makes it lack rocks, plants, weather, and the atmosphere.
And by that point it’s just not none of the above.
Cyclohexane (C6H12) is one of the components of crude oil. Which shows the
balanced combustion reaction for cyclohexane?
Answers
Answer:
D. C6H12+9O2 -> 6CO2+6H2O+heat
Explanation:
got it right on ap ex
The combustion reaction is the reaction between reactants and oxygen. The balanced combustion reaction for cyclohexane is, C₆H₁₂ + 9O₂ → 6CO₂ + 6H₂O + heat. Thus, option D is correct.
What is a combustion reaction?A type of reaction that includes the release of energy and heat when the oxygen reacts chemically with the reactant. The presence of oxygen as one of the reactants is a characteristic property of the combustion reaction.
As a result of the reaction carbon dioxide and water is produced along with heat in the reaction. The balanced combustion reaction of cyclohexane (C₆H₁₂) is given as,
C₆H₁₂ + 9O₂ → 6CO₂ + 6H₂O + heat
Here, the number of carbon is six on both sides, twelve hydrogen on both sides, and eighteen oxygen on the left and right sides of the reaction.
Therefore, option D. C₆H₁₂ + 9O₂ → 6CO₂ + 6H₂O + heat is the balanced combustion reaction.
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PLS!!!! A rubidium isotope has a half-life of almost 50 billion years. Given that scientists estimate Earth's age to be 4.6 billion years, what is the most likely percentage of parent to daughter isotopes of this element currently existing on Earth?
Less than 10 percent
25 percent
50 percent
More than 75 percent
Answers
From the calculation, there is still more than 75 percent on the earth now (option D).
What is half life?The term half life is the time taken for half of the number of radioactive isotopes to remain.
Given that;
N/No = (1/2)^t/t1/2
N = amount at time t
No = amount at the beginning
t = time taken
t1/2 = half life
Hence;
N/No = (0.5)^4.6 * 10^9/50 * 10^9
N/No = 0.94
Hence, the percentage that is currently in the earth is about 94%.
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since arsenic is a nonmetal, as2o3 is expected to be a/an _____ oxide.
Answers
Since arsenic is a nonmetal, as2o3 is expected to be an acidic oxide.
Nonmetals tend to form acidic oxides when they react with oxygen. Acidic oxides can react with water to form acids, and they can also react with bases to form salts. This is because they contain a high concentration of oxygen atoms, which can combine with hydrogen ions to form acidic molecules. In the case of As2O3, it is an oxide of arsenic, which is a nonmetal. This means that it contains a high concentration of oxygen atoms relative to arsenic atoms. When As2O3 reacts with water, it forms arsenous acid, which is a weak acid. This reaction can be represented as follows: As2O3 + 3H2O → 2H3AsO3 As2O3 can also react with bases to form salts. For example, when it reacts with sodium hydroxide (NaOH), it forms sodium arsenite (Na3AsO3): As2O3 + 6NaOH → 3Na3AsO3 + 3H2O Therefore, based on its chemical properties and composition, As2O3 is expected to be an acidic oxide.
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Question 1.
Which is a limitation of using cellulose?
A.its lack of mass production
B.its lack of biodegradability
C.its harm to landfills
D.its high cost to recycle
Question 2.
Which refers to a macromolecule that forms as a result of the joining of multiple monomers?
A. amino acid
B. glucose
C. nucleic acid
D. polymer
Question 3
What does the octet rule state that explains why atoms bond?
A. Atom bonds have eight valence electrons to become stable.
B. Atom bonds lose eight valence electrons to become stable.
C. Atom bonds have eight valence electrons to become unstable.
D. Atom bonds to lose eight valence electrons to become unstable.
Question 4
Shameeka is studying for an exam. She took the notes below about calcium and chlorine, which are known to form ionic bonds.
Calcium, which is a metal, donates 2 electrons to chlorine.
The individual calcium atoms become ions with a negative 2 charge.
The bond between calcium and chlorine makes the atoms stable.
Calcium and chlorine attract each other.
Which best describes Shameeka’s error?
A.Calcium is a metal, so it donates protons, not electrons.
B.The individual calcium atom has a positive, not negative, 2 charge.
C.The bond formed makes the atoms unstable, not stable.
D.Calcium and chlorine repel, not attract, each other.
Answers
Explanation:
Question 1
D
Question 2
D
some macromolecules are polymers. what is a polymer
Answers
Answer:
1 marcomolecules are:- A macromolecule is a very large molecule, such as a protein. They are composed of thousands of covalently bonded atoms. Many macromolecules are polymers of smaller molecules called monomers.
2 polymers are:- a natural or artificial chemical compound consisting of large molecules
Explanation:
hope it helps you
Please help
according to the ____ rule, elements tend to react until they have the same electron configuration as a _____. _____, found on the left of the _____, tend to lose electrons and from ____. _____ tend gain electrons to form _____.
Answers
Answer:
What chapter is this and what grade are you, i can check this for you
Explanation:
What force holds the ionic bond together and what causes it?
Answers
Answer:
Ionic Bonds
Oppositely charged particles attract each other. This attractive force is often referred to as an electrostatic force. An ionic bond is the electrostatic force that holds ions together in an ionic compound.
What does conserving mass mean in a chemical equation?
Answers
Answer:
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
Explanation:
hope that helps