The element X has three naturally occurring isotopes. The masses (amu) and % abundance of the isotopes are given in the table below. The average atomic mass is ______amu. Give your answer two decimal places.
Answers
Answer:
In order to solve for this you would need to plug it into an equation. You would add them all up to eachother after multiplying them by their percentages.
So it would be (0.75*48.90)+(0.18*49.10)+(0.07*50.20). Plug it all into a calculator and you get 49.027amu. Then you would round to significant figures so 49.03amu should be your answer.
Related Questions
b) How much Phosphorus Pentachloride can be made if you begin with 17.8 g of chlorine gas?
Answers
Three students are labeling organisms in their diorama. Zola wants to label the algae and mushrooms as photosynthetic. Saffi wants to label plants and algae as photosynthetic. Ahmed wants to label plants and all bacteria as photosynthetic. Who is correct?
-Saffi and Ahmed
-Zola only
-Saffi only
-Zola and Ahmed
Answers
Answer:
Saffi only
Explanation:
I just took the test and that was the correct answer :)
when does cells breakdown a sugar molecule completely to produce chemical energy ATP the cells need to the following materials
Answers
Answer:
sugar and carbon dioxide
Explanation:
Chemical energy is stored in the bonds of sugars. When the bonds of a sugar molecule are broken, a burst of energy is released that the cell can use. Cells can release energy in two basic processes: cellular respiration and fermentation. Cellular respiration requires oxygen, but fermenta- tion does not.
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1. Hydrogen and nitrogen combine to form ammonia. When nitrogen and hydrogen bond, nitrogen pulls the electrons from hydrogen toward itself. Which statement about the reactants is correct?
A) Hydrogen is oxidized, and nitrogen loses electrons.
B) Hydrogen is oxidized, and nitrogen is reduced.
C) Hydrogen gains electrons, and nitrogen is reduced.
D) Hydrogen is reduced, and nitrogen is oxidized.
2. Which phrase best defines a redox reaction?
A) A reaction in which the number of oxygen atoms is reduced.
B) A reaction in which elements are transferred between different atoms.
C) A reaction is which oxygen combines with different atoms.
D) a reaction in which elements are released from the system.
3.Which statement describes the process of oxidation?
A) Oxidation results in a loss of electrons, so the oxidation number increases.
B) Oxidation results in a gain of electrons, so the oxidation number increases.
C) Oxidation results in a gain of electrons, so the oxidation number decreases.
D) Oxidation results in a loss of electrons, so the oxidation number decreases.
4. Which chemical equation represents a redox reaction?
A) TiCl4(s) + 2H2O(g) → TiO2(s) +4HCl(g)
B) CaO(s) + SiO2(s) → CaSiO3(l)
C) CaCO3(s) → CaO(s) + CO2(g)
D)Fe2O3(s) + 2Al(s) → Al2O3(s) +2Fe(l)
5. Which elements are oxidized and reduced in the reaction below?
Br2 (l) + 2NaI(aq) → I2 (s) + 2NaBr(aq)
A) Bromine (Br) is oxidized, and iodine (I) is reduced.
B) Iodine (I) is oxidized, and bromine (Br) is reduced.
C) Sodium (Na) is oxidized, and bromine (Br) is reduced.
D) Bromine (Br) is oxidized, and sodium (Na) is reduced.
Answers
Answer:
did you do it yet?
Explanation:
Answer:
1. Hydrogen is oxidized, and nitrogen is reduced.
Explanation:
as heat is added to melt ice. Does the temperature change?
Answers
Answer:
Depending on the deformity it will depend on the amount of the ice that is melted,it the majority is melted that is relevant to the heated liquid melting the ice,so yes only the water formalities of the melted ice.
What is a chemical bond?
A. An intramolecular force holding 2 atoms together
B. An attractive force between 2 molecules
C. A gravitational force holding electrons in their orbits
D. An electrostatic force between a proton and an electron
Answers
A chemical bond is an electrostatic force between a proton and an electron. Hence, option D is correct.
What is a bond?A chemical bond is what holds atoms together in molecules.
A chemical bond is what holds atoms together in molecules.
Bonds arise from the electrostatic forces between positively charged atomic nuclei and negatively charged electrons (the positions of which in space are determined by quantum mechanics).
Hence, option D is correct.
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Describe ions of xenon
Answers
Answer: a common ion of xenon is fluoride-ion. xenon oxide difluoride is also a fluoride-ion acceptor, forming the only other anion containing xenon in the +4 oxidation state, the XeOF3− anion in Cs+XeOF3−. Xenon hexafluoride is both a strong fluoride-ion donor and a strong fluoride-ion acceptor.
What is the energy of a photon emitted when an electron in a hydrogen atom relaxes from an orbital in ni
Answers
Answer: Ernest Z. The energy is 1.549×10-19J
Explanation:
The arrows shown in the asthenosphere represent the inferred
slow circulation of the plastic mantle by a process called
O insolation
convection
O conduction
radiation
ion
Question 18
2 pts
The diagram below shows a laboratory box used to
demonstrate the process of convection in the atmosphern
Answers
Red arrows represent the movement of the mantle due to convection. Black arrows represent the movement of the plates due to gravity. Scientists think that this transfer of thermal energy from core to mantle causes convection in the mantle.
please help quickly i will give 15 points
Answers
Hopes this helps
the elements on the periodic table are arranged in order of increasing
Answers
Answer:
atomic number
Explanation:
How
many
moles is 2.55 X 1026 atoms of Neon?
Answers
Answer:
423.44 moles
Explanation:
which electron carrier is not mobile or diffusible in the mitochondrial electron transport chain?
Answers
Answer:
FAD is the correct answer
Explanation:
pls choose it as the brainiest answer
Why isn’t a dream made of matter?
Answers
What volume of 0.205 MK2S solution is required to completely react with 185 mL of 0.120 MCo(NO3)2?
Answers
Answer:
the balanced equation for the above reaction is as follows;
3NiCl₂ + 2K₃PO₄ ---> Ni₃(PO₄)₂ + 6KCl
stoichiometry of NiCl₂ to K₃PO₄ is 3:2
the number of NiCl₂ moles reacted - 0.0102 mol/L x 0.134 L = 0.00137 mol
according to molar ratio
if 3 mol of NiCl₂ reacts with 2 mol of K₃PO₄
then 0.00137 mol of NiCl₂ reacts with - 2/3 x 0.00137 = 0.000911 mol of K₃PO₄
molarity of given K₃PO₄ solution - 0.205 M
there are 0.205 mol in 1000 mL
therefore volume of 0.000911 mol - 0.000911 mol / 0.205 mol/L = 4.44 mL
volume of K₃PO₄ needed is 4.44 mL
How does collision theory relate temperature to the rate of a reaction?
Answers
Answer:
Explanation:
The collision theory explains why reactions occur between atoms, ions, and molecules. With the increase in temperature, there is an increase in the number of collisions. Increasing the concentration of a reactant increases the frequency of collisions between reactants and will, therefore, increase the reaction rate.
most elements are (1) metals (2)nonmetals (3)gases (4)made in labs
Answers
None are made in labs everything on earth is made of the elements so they are natural!
select the reagents you would use to accomplish the syntheses shown below in no more than the number of steps specified.
Answers
Answer:
Carbon Dioxide + Water
Explanation:
Carbon Dioxide + Water > Glucose + oxygen
What is the
name of the
compound
Na2Co3?
Answers
Answer:SODIUM CARBONATE
Explanation:
- Explain the relationship between electronic structure and the chemical
properties of an element.
Answers
Answer: There is a relationship between the electron configuration of an element and its resulting chemical/physical properties. Atoms of an element like to have a full octet of electrons in their valence shells. ... Other elements need to lose or gain electrons to obtain an octet.
:
a substance that can be broken down into simpler substances
Answers
Answer:
compound
Explanation:
hope this hepls
How does the space between particles change as energy is added
Answers
I need uses of acid-base indicators
Answers
Answer:
to indicate the presence of acid or base in a body
need help!!
Is the atomic number of an atom equal to the electrons in an atom
Answers
Answer:
YES.
Explanation:
The atomic number is the number of protons. Because the number of protons is EQUAL to the number of electrons, they're basically equal.
why does a diprotic acid dissociate in a stepwise manner
Answers
Because they have the ability to supply exactly two protons.
Hope this helps!
A diprotic acid dissociates in a step wise manner as it has two protons and it looses one proton each in each dissociation step.
What are acids?Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Compounds HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.
According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic acids depending on the number of protons which are liberated on dissociation.
Acids are widely used in industries for production of fertilizers, detergents batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.
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According to the following map, what is a type of mineral found in Mexico?
a Bauxite
b Copper
c Gold
d Zinc
Answers
Answer:
B. Copper
Explanation:
According to the map, the minerals found there are:
IronSilverCopperThe only mineral given as an option is copper. Therefore, the answer is B.
Which of the following molecules contains a covalent bond? (Use the electronegativity values from the periodic table to help you answer this question.)
Answers
CN- is the molecule which contains a covalent bond in this scenario.
What is Covalent bond?This is the type of bond formed as a result of sharing of electrons between atoms of elements.
It exists in the reaction between compounds between two electronegative elements such as carbon and nitrogen to form cyanide.
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what is the net cell reaction for the chromium-silver voltaic cell?
Answers
Cr(s) → Cr3+(aq) + 3e-Ag+(aq) + e- → Ag(s)
To solve such this we must know the concept of chemical reaction. Therefore, the balanced net cell reaction for the chromium-silver voltaic cell is Cr(s)+3Ag⁺(aq)→Cr³⁺(aq)+3Ag(s)
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction. Chromium-silver voltaic is a cell that is used in electrochemistry.
The balanced net cell reaction for the chromium-silver voltaic cell is
Cr(s)+3Ag⁺(aq)→Cr³⁺(aq)+3Ag(s)
Therefore, the balanced net cell reaction for the chromium-silver voltaic cell is
Cr(s)+3Ag⁺(aq)→Cr³⁺(aq)+3Ag(s)
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What can you infer from the fact that nitrogen gas is useless to animals?
Answers
Answer:
Denitrification changes nitrogen into a gaseous form.
Explanation:
A student electrolysed some water. She collected 20 cm of oxygen, What volume of hydrogen could she also
have collected at the same time?
Answers
According to the chemical formula of water the volume of hydrogen collected on electrolysis of water will be double of water thus volume of hydrogen is 40 cm.
What is chemical formula?Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.
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