Calculate the average atomic mass of unknown element X. You determine that isotope 127X makes up 80%, isotope 126X makes up 17%, and isotope 128X makes up 3%.
A. 127.10 amu
B. 126.86 amu
C. 127.54 amu
D. 126.20 amu
Answer:
Option B. 126.68 amu
Explanation:
The following data were obtained from the question:
Isotope A (¹²⁷X):
Mass of A = 127
Abundance (A%) = 80%
Isotope B (¹²⁶X):
Mass of B = 126
Abundance (B%) = 17%
Isotope C (¹²⁸X):
Mass of C = 128
Abundance (C%) = 3%
Average atomic mass of element X =.?
Th4 average atomic mass of X can be obtained as follow:
Average atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]
= [(127 × 80)/100] + [(126 × 17)/100] + [(128 × 3)/100]
= 101.6 + 21.42 + 3.84
= 126.68 amu
Therefore, the average atomic mass of X is 126.68 amu
ALL OF THESE ARE FORMS OF MIXTURES EXECPT...
A. ALLOYS
B. NEON
C. COLLOIDS
D. SOLUTIONS
Answer:
B. NEON.
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What tectonic plate boundary caused the formation of Mount Fuji?
Answer:
the Amurian plate, the the Okhotsk plate, and the Filipino plate all converge in the region beneath Mount Fuji.
Explanation:
name one state of matter
Answer:
solid
Explanation:
Answer:
Gas
Explanation:
The electron configuration of an element is 1s^ 2 2s^ 2 2p^ 2 How many valence electrons does the clement have? (1 point )
Answer:
:)
Explanation:
Two reasons photosynthesis is important
Answer:
Gives us oxygen to live, and if produces products such as, rubber, timber, herbs, and medicines.
Which of the following is measured in Newtons?
Mass
Acceleration
Weight
Momentum
Answer:
Mass is measured in kg
Acceleration is measured in m/s^2
Weight is measured in Newtons
Momentum is measured in kg/m^2
Why are atoms neutral?
A They have neutrons in the nucleus
B. They have the same number of protons and electrons
They tend to have 8 valence electrons
D
None of the above
Answer:
B. They have the same number of protons and electrons
Explanation:
Protons have a charge of +1, electrons have a charge of -1, and neutrons have no charge, making them neutral. When there are the same number of protons as there are electrons, the charges balance out, leaving you with a neutral atom.
4
The element bromine at room temperature is a liquid with a density of 3.12 g/nl.
Calculate the mass (wanted measurement) of 125 mL (given measurement) of bromine.
(use the given density as the conversion factor to calculate the wanted measurement).
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which order system shows the levels of organization from largest to smallest
organism, organ system cell organ tissue
organism tissue organ system organ cell
organism organ organ system cell tissue
organism organ system organ tissue cell
Answer:
cell → tissue → organ → organ system → organism
Explanation:
Answer:
The correct answer is cell → tissue → organ → organ system → organism.
Explanation:
I know this because I am smart
An increase in which of the following would increase the boiling point of a
liquid?
Answer:
The boiling point increases with increased pressure up to the critical point, where the gas and liquid properties become identical.
How long will it take for 500.0g of radium decay to 2.0g
On July 4, 2020, America turned 7.69 x 10^9
seconds old. On that day, how old was America
in years? (Assume 365 days in a year)
America's age = 243.85 years
Further explanationWhen converting units, list and multiply all the units until you find the unit you want
Time unit conversion
1 year = 365 days
1 day = 24 hours
1 hour = 3600 s
7.69 x 10⁹ seconds to years :
[tex]\tt =7.69\times 10^9~s\times \dfrac{1`hour}{3600~s}\times \dfrac{1~day}{24~hours}\times \dfrac{1~years}{365~days}\\\\=\dfrac{7.69\times 10^9}{3600\times 24\times 365}\\\\=\boxed{\bold{243.85~years}}[/tex]
Please help!!
What colors do acids and bases turn litmus paper?
Answer:
acid turns blue litmus red and base turns red litmus blue
Answer:
turns red or pink if it is acid and turns green if it is a base
Explanation:
litmus paper is blue
Plz help! :) :D I will mark you as BRAINLIEST for the best answer!!! ( I actually mean it)
Physical and Chemical Properties of Magnesium
Here is an EXAMPLE of how it has to be like. Instead of Mercury, you HAVE to do Magnesium
Physical Properties of Mercury: ”I’m a highly stable element, so you can count on me”
Chemical Properties of Mercury: ”I love to travel but I do corrode aluminum so we won’t be flying off on adventures in airplanes planes anytime soon”
what is potiential and kinetic engergy? pls someone answer my question
Answer:
Potential Energy is stored energy or energy of position (gravitational). The object isn't moving. For example, a ball being held is potential energy because the object isn't moving but it has the potential of turning into kinetic energy.
Kinetic Energy is the energy of motion. For example, running. You are moving, and there is clear action and activity
Energy stored in an object due to its position is Potiential energy . Energy that is moving object has due to its motion is Kinetic energy .
What are two properties of most nonmetals
Answer: Summary of Common Properties
High ionization energies.High electronegativities.Poor thermal conductors.Poor electrical conductors.Brittle solids—not malleable or ductile.Little or no metallic luster.Gain electrons easily.Dull, not metallic-shiny, although they may be colorful.Explanation:
May I please have brainiest?
Answer:
The two properties of most non metals are high ionization energy and poor electrical conductivity. The correct option among all the options that are given in the question is option "1". In general it is known that nonmetals are very poor conductors of heat and electricity. The nonmetals that are solid are normally very brittle and has very little or no metallic luster at all. Nonmetals are highly reactive and show variety of chemical properties. It can also be pointed out that the nonmetals gain electrons very easily.
brainliest pleaseee :)
3. Two boxes need to be moved. Box A is 10 kg. Box B is 3 kg. Which box will 1 point
require more force to move?
BOXA
BOX
Answer:
box A
Explanation:
10 is bigger than 3 since 10 is bigger it has more force in it
Pls help me here, thanks in advance
Answer:
What's the problem???
You are standing at position X. Choose the diagram that shows your position when you perceive a sound lower than the actual pitch of the siren.
Answer:
The answer is the second picture.
Explanation:
When you perceive a sound lower than its actual pitch, then you must have been further from the actual position.
What is pitch of a sound?
The pitch of a sound is a perceptual property of sounds that allows sound of similar frequencies to be distinguished.
Pitch is the quality of sound, that makes it possible to judge sounds as "higher" and "lower" in the sense associated with musical notes.
Thus, when you perceive a sound lower than its actual pitch, then you must have been further from the actual position.
Learn more about pitch of sound here: https://brainly.com/question/61859
#SPJ2
Write down the answer. Make sure to use the correct number of sig figs or
spots after the decimal. 987.22 - 377.1*
Answer:
610.1
Explanation:
When we add or subtract the values, the number of significant figures after decimal in result must be equal to the given measurement having less number of decimal places.
In given values 377.1 has only decimal place thus in result after decimal there should be one digit only.
987.22 - 377.1 = 610.1
When we multiply or divide the values the number of significant figures must be equal to the less number of significant figures in given value.
Now we will calculate the difference between 7.69 and 4.0.
7.69 - 4.0 = 3.69
In given values 4.0 have less number of significant figures thus result must have only two significant figures . So we would round the result.
3.7
pls help ill mark you as brainliest
Answer:
Explanation:
Synthesis- D
Combustion- C
Decomposition- A
Single Displacement- C
Double Displacement- B
A hypothetical element has two main isotopes with mass numbers of 59 and 62. If 73.00% of the isotopes have a mass number of 59 amu, what atomic weight should be listed on the periodic table for this element? Answer in units of amu.
since 73% of the isotope is given, take 100%-73% to get the remaining % of the isotopes which is going to be 27%.
hence,
atomic weight= (73×59) + (27×62)
=4307+1302
=5609 amu
Question 5
1 pts
Chloroethene,C2H3C1, reacts with oxygen according to the equation below.
2 C2H2Cl (9) + 5O2(g) + 4CO2 (g) + 2 H20 g) + 2 HCl (9)
What is the amount, in mol, of H2O produced when 10.0 mol of C2H3Cl and 10.0 mol of
O2 are mixed together, and the above reaction goes to completion?
08.00
10.0
04.00
20.0
Lo
Answer:
4.00 moles of water
Explanation:
The equation of the reaction is:
2 C2H2Cl (9) + 5O2(g) -------> 4CO2 (g) + 2 H20( g) + 2 HCl(g)
To find the limiting reactant, we find the species that yields the lowest number of moles of water.
From the reaction equation;
2 moles of C2H2Cl yields 2 moles of water
10 moles of C2H2Cl yields 10 * 2/2 = 10 moles of water
Similarly;
5 moles of oxygen yields 2 moles of water
10 moles of oxygen will yield 10 *2/5 =4 moles of water
Hence oxygen is the limiting reactant.
10 moles of oxygen yields 4 moles of water.
Please choose the best description, or definition of Faunal Succession.
principle stating that specific groups of organisms lived and died within a specific
time frame due to the ice age
principle stating that specific groups of fawns lived in a specific region and are
found in the rocks shoing fawns onl live in specific areas.
principle stating that specific layers of the earth have contain fauna of different
types showing biodiversity.
rinciple stating that specific groups of organisms have followed, or succeeded.
one another in a definite sequence through Earth history
Answer:
Principle stating that specific groups of organisms have followed, or succeeded one another in a definite sequence through Earth history
Explanation:
Principle stating that specific groups of organisms have followed, or succeeded one another in a definite sequence through Earth history describe Faunal succession because it is a principle that indicate that fossil plants and animals succeed each other in a sequential manner even if they occur in different places. Successive strata and faunas are linked together to form composite section in the Earth's history.
Answer:
the last one
Explanation:
Plastic, rocks, rabbits and steel are all made of matter. Matter is made up of tiny particles called ________.
Question 1 options:
a nucleus
atoms
energy
molecules
Answer:
atoms should be the correct answer
Answer:
Matter is made up of tiny particles called atoms.
Explanation:
Atoms are made up of protons, neutrons and electrons. Atoms come together to form molecules which are building blocks for all types of matter.
What’s science in science
Answer:
Science is the pursuit and application of knowledge and understanding of the natural and social world following a systematic methodology based on evidence. Scientific methodology includes the following: Objective observation: Measurement and data (possibly although not necessarily using mathematics as a tool)
Explanation:
Answer:
Modern science is typically divided into three major branches that consist of the natural sciences (e.g., biology, chemistry, and physics), which study nature in the broadest sense; the social sciences (e.g., economics, psychology, and sociology), which study individuals and societies; and the formal sciences
In Ionic compounds the charges of the cation and anion should cancel out.
True
False
describe the purpose of using a chemical equation.
Answer:
The purpose of using a chemical equation is to keep track of elements and the number of atoms of each of the elements on each side of the equation. ... They use symbols and formulas to show the chemical reaction so that chemical names do not need to be written out.
Answer:
:0
Explanation:
Sample Response: Chemical equations show how chemicals interact when a reaction occurs. They use symbols and formulas to show the chemical reaction so that chemical names do not need to be written out. They also help keep track of all elements and the number of atoms of each element on each side of the equation.
How many minutes are In 3,417 seconds?
Answer:
57 minutes and 35 seconds, or 56.95
Explanation:
Answer:
56.95 minutes
Explanation:
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