Explanation:
Average atomic mass of Chlorine = 35.45 amu
The percentage of isotopes is the percentage abundance.
This is given by;
Average atomic mass = (Mass of isotope * Percentage abundance of 35/17 Cl) + (Mass of isotope * Percentage abundance 37/17 Cl)
Let percentage abundance of 35/17 Cl = x
Then percentage abundance of 37/17 Cl = 1 - x
Putting the values in the equation;
35.45 = (35 * x) + (37 * (1-x))
35.45 = 35x + 37 - 37x
35.45 - 37 = 35x - 37x
- 1.55 = -2x
x = 1.55 / 2 = 0.775
Percentage abundance of 35/17 Cl = 0.775 * 100 = 77.5%
Percentage abundance of 37/17 Cl = (1 - 0.775) * 100 = 22.5%
A small amount of liquid bromine is added to a container which is then sealed.
Br2 (l) " Br2 (g)
Riddle
Why did the rock collector like his
collection of metamorphic rocks so much?
Answer:
Because they would keep changing? Or Because they were the hottest?
B. Fill in the blanks with the correct answer. Choose from the choices inside the box.
1. The bones that protect the delicate organs of the body.
2. It is a long flat bone at the middle of the chest and attached to the ribs,
3. They are the bones that protrude at the base of the neck.
4, This bone connects the backbone and the legs.
5. This bone protects our brain.
6. This system of the body gives structural support and shape.
7. These muscles are connected to the bones and are responsible for movements.
8. These are involuntary muscles that are not attached to the bones.
9. These muscles are moving rhythmically, contracting and relaxing alternately to generate force to
pump blood throughout the body.
10. A system of the body that supports the skeleton and responsible for body movement.
Muscular system
skeletal system
smooth muscles
cardiac muscles
Skeletal muscles
hipbone
collarbone
axial skeleton breastbone
skull
Answer:
Answer:
Asan po yung choices?
Suppose your friend investigated the color of
pea pods and concluded that green pods (G) were
dominant over yellow pods (g). What experimental
evidence would be needed to support this
conclusion?
Help pls!!
Answer:
Wag kang tatalon Kasi malayu ang talunan mo
Jazz and Pam went to Six Flags over Texas. They had fun riding the rides at the
amusement park. Their favorite ride was the Road Runner Express roller coaster. It
made so many turns, and it was going up hills and down hills really fast. Their inertia
was always changing throughout the ride. Once the roller coaster came to a stop they
moved forward into their seatbelt. This is an example of which Newton's Law?
Answer:
newtons first law
Explanation:
an object in motion will stay in motion unless acted upon by an outside force
Alex rode his bike from school to home and measured the distance to be 400 meters.
It only took him 10 minutes to get home. What is his average speed in meters per
minute?
O
40m/min
O
.0250m/min
.667m/min
O
240,000m/min
Answer: 40 meters per minute
Explanation:
If the total length was 400 meters and it took him 10 minutes, divide 400 by 10 and boom there you go
Answer:
40 m/min
Explanation: why? because I did that before and it was right so I am sure about the answer and all to do is to divide 400 meter and 10 minutes
which you will get 40
400:10 = 40
You enter a crime scene and discover one, single blood drop. You immediately measure the drop and calculate it’s Impact Angle. However, you will not be able to determine the Point of Origin of this single blood drop. Why can’t you determine the Point of Origin from a single blood drop?
Answer:
You cannot determine the point of the origin of a single blood drop because it is just a single drop.
When a drop of blood splatters over the ground drag and trail occurs on it which could be useful when there are a lot of it and you can measure the distance from the origin but in case of a single drop it cannot help you because of one main reson which is distance.
You only CAN measure the direction but not the distance of the one single drop.
Let's take a scenario for a example.
A murderer approaches it's target from behind and grope it's target and stabbed him from front.
You will notice that the blood splatter does not occur in a straight direction but it spreads in kind of in a semicircle.
(THIS IS JUST AN EXAMPLE OF A SCENARIO. there are many other cases but this just an example to make the concept clear)
Hope this answer helped
Which is the last element in the periodic table?
Answer:
Oganesson!
It is a synthetic chemical element with the symbol Og and atomic number 118. It was first synthesized in 2002 at the Joint Institute for Nuclear Research in Dubna, near Moscow, Russia, by a joint team of Russian and American scientists.
Answer:
the last element is ogasnesson
Select all the correct answers.
Which statements correctly match a chemical name with its formula? Use the list of polyatomic ions and the periodic table to help you answer.
The chemical formula for ammonium carbonate is NH4HCO3.
The chemical formula for ammonium hypochlorite is NH4ClO.
The chemical formula for ammonium nitrate is NH4NO3.
The chemical formula for ammonium phosphate is NH4(PO4)3.
The chemical formula for ammonium sulfate is (NH4)2SO3.
Answer:
The correct answers are C. Ammonium nitrate - NH4ClO and D. Ammonium phosphate - NH4(PO4)3
Explanation:
The microscope has the power to show details of
an object more clearly. This is known as
Answer:
Explanation:
in order for the user to clearly view an image, the microscope must carry out two processes. ... the ability of the microscope to increase the size of the image of an object is called______. magnification. the microscope has the power to show details of an object more clearly.
The power of a microscope to show details of an object more clearly is: resolution.
A microscope can be defined as an optical device which is typically designed and developed to make an enlarged (magnified) image of a minute (very small) object, in order to show all the littlest or tiniest details (information) about the object that cannot be seen by the natural human eye.
Generally, the different types of microscopes include:
Inverted microscope.Compound light microscope.Scanning electron microscope.Polarizing microscope.In Science, the resolution of a microscope is a measure of its power to clearly show the details of an object.
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Describe the three steps involved in producing crystals of the salt copper sulfate.
Answer:
Add copper (II) oxide (insoluble base), a little at a time to the warm dilute sulfuric acid and stir until the copper (II) oxide is in excess (stops disappearing) Filter the mixture into an evaporating basin to remove the excess copper (II) oxide. Leave the filtrate in a warm place to dry and crystallize.
The three main steps involved in producing crystals of the salt copper sulfate is listed below.
What is the process of making Soluble Salts ?
Soluble salts can be made by reacting acids with soluble or insoluble reactants.
Titration method is used if the reactants are soluble
Insoluble salts are made by precipitation reactions.
For producing crystals of the salt Copper Sulfate from copper oxide following three steps needs to be done ,
1. Copper oxide is added continuously with a spatula to the Water Bath heated Sulfuric Acid , until it gets in excess.
2. The mixture is filtered to remove extra Copper Oxide, and then pour the filtrate (Copper sulfate solution) into an evaporating basin , where it is heated to evaporate half of the water .
3. The solution is poured into a watch glass so that all the water evaporates.
Hence we are left with blue and regularly shaped Hydrated copper sulfate crystals .
To know more about Soluble Salts
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(1) How will you determine which dyes are present in the beverage that you have chosen to analyze?
(2) How will you determine the concentration of each dye present in the beverage?
(3) By what factor will you change the concentration as you monitor the absorbance/transmittance of the solution?
(4) Write a preliminary plan for your experimental procedure. Include what each member of your team will do as part of this plan.
Could anyone just suggest questions to practice using Faraday's Law?
Answer:
just to get points
Explanation:
which alkene will most likely have the highest boiling point
a. ethene
b. hexane
c. pentene
d. propyne
Answer:
B. hexane
Explanation:
Im not sure I just goggled it
Answer:
A. Ethene
Explanation:
Ethene, propene and the various butenes are gases at room temperature. All the rest that you are likely to come across are liquids. Boiling points of alkenes depends on more molecular mass (chain length). The more intermolecular mass is added, the higher the boiling point
what is haemoglobin? Name its function.
Answer:
Haemoglobin is the red pigment which is present in our blood and helps in transporting oxygen to different parts of our body.
Hope it helps
Answer:
Haemeglobin is a red substance that has the function of transporting oxygen into the blood.
Explanation:
what is chemical composition of the atmosphere
Answer:
nitrogen 78%, Oxygen 21%, Argon 0.9%, Carbon dioxide 0.03%, water 0-4%(depends)
Explanation:
Answer:
definition: The atmosphere is composed of a mix of several different gases in differing amounts. The permanent gases whose percentages do not change from day to day are nitrogen, oxygen and argon. Nitrogen accounts for 78% of the atmosphere, oxygen 21% and argon 0.9%.
Explanation:
Nitrogen accounts for 78% of the atmosphere, oxygen 21% and argon 0.9%. Gases like carbon dioxide, nitrous oxides, methane, and ozone are trace gases that account for about a tenth of one percent of the atmosphere.
Layers of the atmosphere:
- From lowest to highest, the major layers are the troposphere, stratosphere, mesosphere, thermosphere and exosphere
A solution of benzene is prepared by dissolving 0.32 mg of benzene to volume of 100 dm3 calculat molarity
Answer:
4.10 x 10⁻⁸ M
Explanation:
The molarity (M) of a solution is defined as the number of moles of solute per liter of solution. We have to first calculate the number of moles of solute (benzene) from the mass and the molecular weight:
Benzene has the chemical formula C₆H₆. So, its molecular weight (MW) is calculated from the molar mass of C (12 g/mol) and H (1 g/mol):
MW(C₆H₆)= (12 g/mol x 6 C) + (1 g/mol x 6 H) = 78 g/mol
Then we convert the mass of benzene (0.32 mg) from mg to grams and divide the mass into the MW:
mass = 0.32 mg x 1 g/1000 mg = 3.2 x 10⁻⁴ g
moles of benzene = mass/MW = 3.2 x 10⁻⁴ g/(78 g/mol) = 4.10 x 10⁻⁶ mol
Now, we convert the volume of solution from dm³ to L:
liters of solution = 100 dm³ x 1 L/1 dm³ = 100 L
Finally, we divide the moles of benzene into the volume of solution in liters:
M = moles of benzene/liters of solution = 4.10 x 10⁻⁶ mol/100 L = 4.10 x 10⁻⁸ mol/L = 4.10 x 10⁻⁸ M
please help! Doesn't need to be super long maybe 1-2 sentences for each please! (30 points)
Why do you believe knowing how elements and compounds react together is essential in everyday matters?
Some elements are more "reactive" than other elements; why do you think this is?
Answer:
it is very important to know how elements and compounds react together because everything that surrounds us is made out of elements and compounds. Therefore, understanding how these work can allow us to have a better understanding of the world that surrounds us. Moreover, it can avoid accidents when we deal with dangerous compounds, such as when we cook or clean.
Explanation:
Why is it easier to remove an electron from potassium than sodium?
Name the technique used to separate oil from water and also the principle involved in the separation.
The technique used to separate oil from water is known as decantation.
Oil has less density compared to that of water.
By the process of decantation we can separate mixtures by removing a liquid layer that is free of a precipitate.
Antarctica is a frozen land so cold and I see no changes in Wheeler scientist have discovered fossils
Answer:
The correct answer is - due to the movement of plates it is relocated.
Explanation:
Antarctica is a very cold part of the earth, it is so cold that there is no growth of trees or such vegetation. Even though there are no or less vegetation scientists found fossils of the trees.
It is relocated from the north where the conditions were warmer and easy for tree growth. It is then moved due to plate movements to the south pole. This is the reason behind the fossils scientist found.
The value of resistance r was determined by measuring current I flowing through the resistance with an error
Correct question is;
Resistance of a given wire is obtained by measuring the current flowing in it and the voltage difference applied across it. If the percentage errors in the measurement of the current and the voltage difference are 3% each, then error in the value of resistance of the wire is?
Answer:
6%
Explanation:
From ohms law, we know that;
R = V/I
Where;
R is resistance
V is voltage
I is current
Now, the percentage error in the resistance is given by the formula;
ΔR/R = ΔV/V+ ΔI/I
We are told that the current and the voltage difference have a percentage error of 3% each. Thus;
ΔR/R = 3% + 3% = 6%
14. An increase in temperature results in an increase in ...
(there are two correct answers)
A.Water molecules
B.The melting point
C.Pressure
D.Fun
Answer: its C. and B.
Explanation:
hopes this helps
what would be the ph of an aqueous solution of sulphuric acid which is 5×10^_5 mol l^_1 in concentration
Answer:
the ph of an aqueous solution of sulphuric acid which is 5*10^5 mol in concentration is basic in nature
write the line formular,condensed formular and structural formular of 3-ethyl-1,2-dimethylheptane
This formula is wrong because a substituent can't attach with 1st carbon in chain or the here the no. of carbon in carbon chain is 8
hiiii everyone my previous account has been deleted who knows me plz follow
Answer:
okie!
Explanation:
Answer:
ok i. d k u but thnaks for points ill follow u anyways lol
Explanation:
How many atoms are in 4.25 g of Ag?
Group of answer choices
2.76 x 10^26 atoms
2.37 x 10^23 atoms
2.76 x 10^23 atoms
2.37 x 10^22 atoms
what is the name of the atom with 16 protons, 15 neutrons and 18 electrons
how can you predict if a bond will be ionic or covalent by using the periodic table
Answer: There is a couple different ways to determine if a bond is ionic or covalent. By definition, an ionic bond is between a metal and a nonmetal, and a covalent bond is between 2 nonmetals. So you usually just look at the periodic table and determine whether your compound is made of a metal/nonmetal or is just 2 nonmetals.
How does the concentration of ions in a strong base differ from a weak base?
1 full sentence answer. TY!
Answer:
Strong acids ionize completely in aqueous solutions while weak acids release a few ions in aqueous solutions.