Chemistry High School

Can someone help please?

Copper occurs naturally as a mix of two isotopes: Copper-63 with a mass of 62.930 amu and copper-65 with a mass of 64.928 amu. The percent abundance of copper-63 is 69.09%.
Calculate the atomic mass of copper.

Answers

Answer 1
Take the weighted average of the individual isotopes.Explanation:63Cu has 69.2% abundance.65Cu has 30.8% abundance.So, the weighted average is 62.93×69.2% + 64.93×30.8% = 63.55 amu .If we look at the Periodic Table, copper metal (a mixture of isotopes but 63Cu and 65Cu predominate) has an approximate atomic mass of 63.55 g⋅mol−1 , so we know we are right.

Answer 2

Answer: 63.55

Explanation:

The attached chart shows the calculation.  The orange line points to the % abundance of Cu-65, which is the difference of 100% less the % Abundance of Cu-65 (since there are only 2 isotopes).

The weighted average contribution of each istope is calculated (blue arrow) and then summed to find the atomic mass of copper.

Can Someone Help Please? Copper Occurs Naturally As A Mix Of Two Isotopes: Copper-63 With A Mass Of 62.930

Related Questions

What are the consequences of building a equitable water sanitation

Answers

Answer:

Water and sanitation services contribute to greenhouse gas emissions. Choice of wastewater treatment technologies, improved pumping efficiency, use of renewable sources of energy, and within-system generation of energy offer potential for reducing emissions.

Explanation:

E is energy in joules

v is frequency

h is Planck's constant, h = 6.626 x 10-54

A gamma ray has a wavelength of 3.0x10-12 m. Calculate the

frequency of this wave.

O a

1.00 x 10-20 HZ

1.00 x 1020 Hz

Oc

9.00 x 10-4 Hz

Od

3.00 x 100 HE

Question 3 (1 point)

Answers

Answer:          .

8575,387w40-7564826=6.626x10-54

Explanation:   .

Spending time studying the 5 there

Answers

What do you mean??? Is this a problem or something if so where is the picture and explain

find the atomic numbers of the as yet undiscovered next two members of the series.

Answers

What are u asking ???

Directions: Answer the questions below. Write your answer on the space provided for each number.
1. Draw a schematic diagram of a series and parallel circuit
2. How are the appliances connected in your house? Identify which among these are connected in series? In parallel?
3. Which is said to be the more efficient connection to use at home? Series or Parallel? Explain your answer.​

Answers

I ieieheueueueuiejejdjdjeiwieiejejrjrnrnrjr
It should be number 3

How would the electron configuration of nitrogen change to make a stable configuration?
(1 point)

Answers

Answer:

it would gain three electrons

Explanation:

have a nice day

Answer: It would gain THREE electrons

Explanation:

took the assessment got 100% hope you get the same

Can you please check my answer?​

Answers

Answer:

!!!!!!!!!!!!!!!!!

Explanation:

!!!!!!!!!!!!!!

How many protons, neutrons, and electrons make up an ion of
radium-208 that has a +2 charge?

Answers

Answer:

proton=88

electron=88

neutron=138

alcoholic fermentaion occurs when there is a lack of what

Answers

this occurs when muscle cells cannot get oxygen fast enough to meet their energy needs through aerobic respiration

history of atomic structure​

Answers

Matter is composed of indivisible building blocks. This idea was recorded as early as the fifth century BCE by Leucippus and Democritus. The Greeks called these particles atomos, meaning indivisible, and the modern word “atom” is derived from this term. Democritus proposed that different types and combinations of these particles were responsible for the various forms of matter. However, these ideas were largely ignored at the time, as most philosophers favored the Aristotelian perspective.

The temperature of the ideal gas in the container shown is 300k. The gas occupies a volume of 1.27. What would be the volume of the gas if it’s temperature were decreased to 100k?

Answers

Answer:

0.432

Explanation:

The temperature of the ideal gas in the container shown is 300K. The gas occupies a volume of 1.27. What would be the volume of the gas if it’s temperature were decreased to 100K?

At 100K the particles are moving 1/3 as fast as 300K so the volume would be

1/3 X (1.27) =0.423

In a varve, summer is represented by _____.

sediment from melting glaciers being deposited in lakes

clay from wind-blown dust

ash from nearby volcanoes

None of these

Answers

Answer:

sediment from melting glaciers being deposited in lakes

Explanation:

I took the test

Which element has fewer than four dots in its electron dot diagrams?

arsenic (As)
sulfur (S)
krypton (Kr)
gallium (Ga)

Answers

The answer is Gallium (Ga)

Answer:

Gallium (Ga)

Explanation:

Write a balanced chemical equation for calcium carbonate and water

Answers

Answer:

Ca(OH)2 + CO2 --> CaCO3 + H2O

Explanation:

Describe how the properties of elements in the same group differ to the properties of elements in the same period.

Answers

Answer:

All the elements of a group have similar chemical properties because they have same no. of valence electrons in their outermost shell.

All the elements of a period have different chemical properties because they have different no. of valence electrons in their atoms.

Answer:

4

Explanation:

Same group elements have the same physical properties and same elements in period have same chemical properties

HURRY! NO SPAM!!!!!!!!!!!!!!
Sodium chlorate decomposes into sodium chloride and oxygen gas as seen in the equation below.

­­2NaClO3­ --> 2NaCl +3O2

How many moles of NaCl were produced by 3 moles of NaClO3­? Round your answer to the nearest whole number.

Answers

2moles of NaCl produced by 2 moles of NaClO_3Let required moles be x .

[tex]\\ \bull\sf\longmapsto 2:2=3:x[/tex]

[tex]\\ \bull\sf\longmapsto \dfrac{2}{2}=\dfrac{3}{x}[/tex]

[tex]\\ \bull\sf\longmapsto \dfrac{3}{x}=1[/tex]

[tex]\\ \bull\sf\longmapsto x=3mol[/tex]

can we separate an azeotropic mixture by distillation?why do we call it a mixture?
​

Answers

Becases their composition is unchanged by distillation

Water is placed in an electrolysis machine. The water placed in the machine begins to bubble. The gas is collected in two separate containers . It is noticed that when a glowing splint is placed in one gas, it flames up. In the other gas, a glowing splint produces a small popping sound signifying a tiny explosion........................................What is the balanced chemical equation for this reaction?

Answers

The equation of the electrolysis of water is as follows; 2H2O(l) ----> 2H2(g) + O2(g).

What is electrolysis?

Electrolysis is the break down of a compound owing to the passage of direct current through the compound. The electrolysis of water yields the compounds hydrogen and oxygen in a ratio of 2:1.

The equation of the electrolysis of water is as follows; 2H2O(l) ----> 2H2(g) + O2(g).

Learn  more about electrolysis: https://brainly.com/question/12054569

QUICK!! 2NaN3 —> 2Na + 3N2

this equation is balanced, but why does the N in the reactant have a subscript of 3, and the N in the product has a subscript of 2.

why did the subscript change? from what i learnt, when you balance an equation, you can only use coefficients to balance the equation.

Answers

Answer:

-Before balancing the equation, you need to determine the index of the components in the substances correctly to balance

-Between two atoms in the molecule N2 forms a stable triple bond, so nitrogen gas is denoted N2.

-Nitrogen in compounds with sodium carries a charge of -3, and sodium has a charge of +1 in all compounds, so we get NaN3

Explanation:

answer from VNese, used GGtranslate

True or False. Air masses are huge bodies of air that have similar temperature, salt content and pressure at a given height.

Answers

Answer :

→ TRUE

Explanation:

Air masses are large volumes of air that have generally the same temperature and pressure.

please help me fast!!

Answers

Answer:

small i think

Explanation:

Someone pls help me With this I will make you as brain

Answers

The answer to that question is c

The type of energy stored in food and batteries is

Question 1 options:

Thermal


chemical


electromagnet


Kinetic

Answers

Answer:

chemical

Explanation:

;)

how to gain weight?
explain me please. ​

Answers

Answer:

just do it

Explanation:

However, there are also many people with the opposite problem of being too skinny (2Trusted Source).

This is a concern, as being underweight can be just as bad for your health as being obese.

Additionally, many people who are not clinically underweight still want to gain some muscle.

Whether you’re clinically underweight or simply struggling to gain muscle weight, the main principles are the same.

This article outlines a simple strategy to quickly gain weight — the healthy way.

Answer:

Eat more than what calories you burn, eat food with nutrients and eat more frequently. Exercise so you can gain muscle.

3. How did your hypothesis work out? What was surprising in this experiment?


someone help please

Answers

Answer:

Whats the hypothesis and the experiment?

Explanation:

I cant really help without context

4Hg(OH)2+ H3PO4 —> Hg3(PO4)2 + 5H20
Is this equation balanced or not? Give a full explanation and I’ll mark as brainliest too

Answers

Answer:

Not balanced.

Explanation:

It a double displacement reaction of a base and acid. The balanced equation is:

3Hg(OH)2 + 2H3PO4 → Hg3(PO4)2 + 6H2O

Please help me with this ill mark brainliest please please im literally crying here

Answers

Answer:

B)

Explanation:

The mass remains the same before the reaction and after. A chemical reaction takes place when vinegar and baking soda are mixed. One of the new substances formed is carbon dioxide gas. If the carbon dioxide gas is contained, the mass of the substances will stay the same according to the Law of Conservation of Mass

Answer:

B is the correct option.

Explanation:

The system is a closed one because Alison closed the container with a balloon immediately. With this mass can't change and law of conservation of mass states in chemical change, mass in neither created nor destroyed.

Why the melting point of sodium chloride is higher than naphthalene

Answers

Answer:

This is because sodium chloride has electrostatic forces of attraction and thus this tends to hold the the sodium and chloride ions very strongly and thus responsible for the high melting point. Sodium chloride is very soluble in water than naphthalene.

Explanation:

This is because sodium chloride electrostatic forces of attraction ad thus this tend to hold the sodium and chlorine ions very strongly thus it is responsible for the high melting point.

Please help, I need help with this question

Answers

Answer:

Flourine

chlorine

bromine

iodine

trash photo again but the middle question is answered i just need the top and bottom question answered :)

Answers

Answer: ok

Explanation: i agree

Other Questions
Attends and animals shown in the cagam.babiesAer connecting the battery to the wire the student brings a few pieces of iron near the iron mall Which statement describes what will hapen to the tro pieces?The battery behaves e a magnet that repels the pieces of ironThe ironnal behaves e a masnet that attracts the pieces of ironTheron produces electric current that attracts the pieces of ironThe coil rotates which produces electric current that repels the pieces of ironO what is 6+6=blank find the answer please An amount of 3560 is decreased by 35.5% every year how much will it be worth after eight years defined the term oleum I = $141.60; P = $590; t = 6 yearsFind the rate how did opium trade in china affect British merchants? what is important functionally about the specialized epithelium in the bladder what is the best way to put the sentence in the active vocie while still maintaining its meaning Go to your math tools and open the Graph tool to graph the equation you found for calculating profit. Set the scale of the graph to go from -5 to 40 on the x-axis and from -80 to 80 on the y-axis.Part AWhat do the points on the line in quadrant IV represent in terms of the situation? The most abundant Carbon on our planet is Carbon-12. There are two isotopes of Carbon, Carbon-13 and Carbon-14. What makes the Carbon isotopes different from the stable version of the Carbon atom?the number of protonsthe number of neutronsthe number of electronsthe atomic number What is a source? Describe two different types of sources. NEED ANWSER ASAP Question 10 of 2What is the coefficient in the expression 8x2 +1?O A. 1. xO C. 2O D. 8What is the coefficient? Identify the independent and dependent variables in the experiment. State a hypothesis to be tested in the experiment. State how the control group will be treated differently from the experimental group.Name two factors that would be kept the same in the control and experimental groups. Describe the type of data that would be collected in the experiment. Why is meiosis important for organisms?A. It allows for genetic variation among organisms.B. It produces genetically identical cells.C. It provides a means of asexual reproduction. Rationalise the denominator and simply Please help :(. I really need the answer a bit fast! I'll mark you the brilliantest Find the Linear function model that best fits this data. 3/5e-6=-2/5(e-10)-7 The government under the Articles of Confederation consisted of) only a unicameral legislatureB) only executive and judicial branchesC) only legislative and judicial branchesD) legislative, judicial, and executive branchesE) only a bicameral legislature(AP Classroom) Question: How do mushrooms get the nutrients they need to grow?