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: 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.
Related Questions
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
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
[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]
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: .
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
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.
Spending time studying the 5 there
Answers
alcoholic fermentaion occurs when there is a lack of what
Answers
Someone pls help me With this I will make you as brain
Answers
find the atomic numbers of the as yet undiscovered next two members of the series.
Answers
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.
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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
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
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.
can we separate an azeotropic mixture by distillation?why do we call it a mixture?
Answers
please help me fast!!
Answers
Answer:
small i think
Explanation:
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:
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
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.
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
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
Which element has fewer than four dots in its electron dot diagrams?
arsenic (As)
sulfur (S)
krypton (Kr)
gallium (Ga)
Answers
Answer:
Gallium (Ga)
Explanation:
Please help, I need help with this question
Answers
Answer:
Flourine
chlorine
bromine
iodine
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.
Can you please check my answer?
Answers
Answer:
!!!!!!!!!!!!!!!!!
Explanation:
!!!!!!!!!!!!!!
The type of energy stored in food and batteries is
Question 1 options:
Thermal
chemical
electromagnet
Kinetic
Answers
Answer:
chemical
Explanation:
;)
trash photo again but the middle question is answered i just need the top and bottom question answered :)
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Answer: ok
Explanation: i agree
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
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
Write a balanced chemical equation for calcium carbonate and water
Answers
Answer:
Ca(OH)2 + CO2 --> CaCO3 + H2O
Explanation:
True or False. Air masses are huge bodies of air that have similar temperature, salt content and pressure at a given height.
Answers
Explanation:
Air masses are large volumes of air that have generally the same temperature and pressure.