Answer:
0.1 M
Explanation:
Molarity = number of moles / litres of solution.
4 g of calcium bromide = 0.02 mol
(found by dividing 4 g by the atomic mass of CaBr2, which is 199.886)
200 mL of solution = 0.2 litres
Molarity = 0.02 mol / 0.2 L = 0.1 M
Taking into account the definition of molarity, the molarity of the solution is 0.1 [tex]\frac{moles}{L}[/tex].
In first place, you have to know that molarity is a measure of the concentration of that substance and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{L}[/tex].
In this case you know that 4.0 g of calcium bromide, CaBr₂, dissolves in enough water. Then, the molar mass of calcium bromide being 199.8 g/mole, (that is, the mass of one mole of the compound), the number of moles that 4.0 g of the compound contain is calculated as:
amount of moles=4.0 g × [tex]\frac{1 mole}{199.8g}[/tex]
amount of moles= 0.02 moles
And being the volume 200 mL = 0.2 L (being 1000 mL= 1 L), and replacing the values in the definition of molarity, you obtain:
[tex]Molarity=\frac{0.02 moles}{0.2 L}[/tex]
Solving:
Molarity= 0.1 [tex]\frac{moles}{L}[/tex]
In summary, the molarity of the solution is 0.1 [tex]\frac{moles}{L}[/tex].
Learn more about molarity with this example: brainly.com/question/15406534?referrer=searchResults
After using soap to wash dishes by hand, it is sometimes difficult to keep your hands from remaining slick. Explain why rinsing your hands in lemon juice would make them less slick.
Answer:
Explanation: Rinsing hands in lemon juice would make them less slick because when a acid (soap) and a alkaline (lemon juice) reacts it becomes neutral
PLS HELP ME
The moon is 2.39 • 10^5 miles from the earth. The
average man is 6 feet tall. How many men would have
to stand on top of one another to reach from the earth
to the moon? (there are 5,280 feet in a mile. How many
miles is 6 feet?)
Number of men required to stand on top of each other to reach moon from earth are :
[tex] \boxed{ \boxed{ \: \: \: \: \: \: \: 210320000 \: \: \: \: \: \: \: }}[/tex]
A 2.00 mL sample of a substance A has a density of 18.4 g/mL and a 5.00 mL sample of
substance B has a density of 35.5 g/mL. Do you have an equal mass of substances A and
B? Explain your answer.
Answer: No, the samples are not of equal masses.
Explanation: Mass is volume X density
A: (2ml)*(18.4g/ml) = 36.8 g
B: (5ml(*(35.5g/ml) = 177.5 g
Does a radio have energy if it’s turned off
Answer:
no
Explanation:
1. Obtain Information Search for and watch an
online video clip that shows the lotus effect.
What do
you
think causes this phenomenon?
Answer:
up with you and the other day and I don't think I can get a chance
HELLO MAY SOMEONE PLZ HELP ME ON THIS!!!;$7&:
Answer:
Variable data is defined as information and figures used to build control charts. Variable data can be used to create average (X-bar) charts, range charts, and sample standard deviation charts or "S-charts."
what is the mass 2 moles of urea
Answer:
60.06 g/mol
The solute is urea, CO(NH2)2. Molar mass of urea: (12.01) + 16.00 + 2(14.01 + 2(1.008)) = 60.06 g/mol.
Explanation:
please mark me brainliestAnswer:
60.06 g/mol
Explanation:
the solution area,CO(NH2)2.molar mass urea:
(12.01)+16.00+2(14.01+2(1.008))=60.06g/mol
2. What do you think may have happened to the "bad" chocolate bar? Do you think
it was made poorly? Or do you think something happened to the chocolate on the
way to the customer? Also, is there a way Charlotte can avoid this issue in the future?
Explain.
Answer:
2
Explanation:
Can someone please help me
(1) One night while looking through his telescope,
Reginald saw three planets in the sky. X, Y. and
Z. X was smaller than Y, and Y was smaller than Z.
Was Z larger or smaller than X?
Answer:
Z was smaller than X
Explanation:
if X<Y and Y<Z
therefore X<Z
At the end of an experiment, a scientist ___ or ____ his/her hypothesis.
Supports, proves
Proves, rejects
Supports, rejects
Disproves, proves
Chemical bond meant by.... what?
Answer:
Chemical bonding, any of the interactions that account for the association of atoms into molecules, ions, crystals, and other stable species that make up the familiar substances of the everyday world.
Answer:
A chemical bond is the physical phenomenon of chemical substances being held together by attraction of atoms to each other through sharing, as well as exchanging, of electrons -or electrostatic forces.
Which one of the give elements the least reactive?
A. Fluorine
B. Chlorine
C. Iodine
D. Bromine
Answer:
c
Explanation:
iodine is the answer.please mark me as brianlist.
Answer:
Fluorine
Explanation:
It is the most reactive
please help me with my question
Answer:
D
Explanation:
17^0 has extra electon
Back page anwsers of adobe sisters recap sheet
Answer:
I'm sorry, you didn't post the pictures.
Identify one instance each of kinetic energy and potential energy
Answer:
Few Examples of Kinetic Energy
The following are typical examples of kinetic energy:
A wrecking ball used to demolish a building through utilization of the kinetic energy it possesses in motion.
Conversion of liquid water to steam, by virtue of the fast movement of the molecules of the liquid upon agitation
A golf ball after being struck off the tee
An asteroid falling towards Earth at incredible speed
A downhill skier traveling down a hill
The flow of a river
An airplane in motion (possesses a tremendous amount of kinetic energy. This is because the mass of the airplane and the velocity at which it moves are enormous)
Explanation:
Answer:
"The battery in the car has potential energy in the form of chemical energy. As the car is turned on and moves, this potential energy becomes kinetic energy."
Explanation:
Remember to change it up a bit.
What process must occur to cause sediment to stick together when forming sedimentary rock?
cooling
cementation
Compaction
weathering
Answer:
Compaction and Cementation
Dissolved minerals in the ground water precipitate (crystallize) from water in the pore spaces forming mineral crusts on the sedimentary grains, gradually cementing the sediments, thus forming a rock
A substance was analysed and found to contain 26.57 % potassium, 35.36% chromium, and
38.07 % oxygen by mass.
What is the empirical formula of the substance?
Select one:
question
O a. K2Cr205
O b. K2Cr207
O c. KCr2O7
O d. K_Cro
Answer: K2Cr2O7
Explanation: Pretend we have 100g of the compound. use the percentage to calculate how many grams of each element are in the 100g.
K: 26.57g
Cr: 35.36 g
O: 38.07 g
Now divide by the molar mass of each element to find the moles of each:
K: 0.7 moles
Cr: 0.7 moles
O: 2.4 moles
That gives us 3.8 moles total. But what's important is to find a factor that would bring all of these mole values to a whole number, since they must be in whole number proportions. The closest I got was around 3.
That would lead to the following empirical formula: K2Cr2O7.
Please help me!! Really important
Answer:
Lanthanum and Lutetium
I hope this will help you
Which of the following is NOT a correct conversion factor?
1 cm = 0.01 m
1 km = 1000 m
1 cm = 100 m
1 dm = 0.1 m
Answer: 1 cm = 100m
Explanation: Centi- is the prefix used to designate 0.01 (one hundredth) of something. 1 cm means 0.01 m.
1 cm = 100 m is NOT a correct conversion factor. Option C is correct.
what are conversion factors?The conversion factors are the factors that re-use to convert some values from unit to unit of another value like from centimeter to meter from meter to kilometer from milligram to gram.
In one centimeter it is the suffix used to denote it is the one by hundred value of the on meter or which is equal t one meter so, 1cm = 0.01 meters as it is the 1/100 part f the one-meter distance.
Therefore, Option C is correct. 1 cm = 100 m is NOT a correct conversion factor.
Learn more about conversion factors, here:
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Why is agar medium used in Petri dishes?
A.It makes bacteria appear larger.
B.It sterilizes the petri dish.
C.It helps microorganisms grow.
D.It makes cells glow.
Answer:
C is the correct answer.
Explanation:
Agar provides a solid growth surface for the bacteria, upon which bacteria reproduce until the distinctive lumps of cells.
The agar medium is used in Petri dishes because it helps microorganisms grow. option C is correct.
What is a microorganism?A microorganism is a microscopic body that cannot be seen with the normal human eyes on anything it can be a virus or bacteria or both. Viruses are disease-causing mostly but there are some good bacteria too.
The use of agar medium is the source of food for the microorganism as all the micronutrients and macronutrients with essential amino acids are present into it.
Therefore, option C is the correct agar medium used in Petri dishes because it helps microorganisms grow.
Learn more about microorganism, here:
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How many elements are in “H2”
What is the function of a cell in relation with the human body?
Answer:
Explanation:
They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Cells also contain the body's hereditary material and can make copies of themselves. Cells have many parts, each with a different function.
22 °C to K (approximate room temperature)
Answer:
295.15 i think
Explanation:
If I have 2.4g of magnesium, how many g of oxygen(O2 ) will I need to react completely with the magnesium? 2Mg +O2 → MgO
Explanation:
just trying....hope that helps
1.6 grams of oxygen will react with 2.4 grams of magnesium.
Explanation:
Given:
2.4 grams of magnesium.
The reaction between magnesium and oxygen:
[tex]2Mg+O_2\rightarrow 2MgO[/tex]
To find:
The mass of oxygen required to react with 2.4 grams of magnesium.
Solution:
The mass of magnesium = 2.4 g
Moles of magnesium =[tex]\frac{2.4 g}{24.305 g/mol}=0.0987 mol[/tex]
[tex]2Mg+O_2\rightarrow 2MgO[/tex]
According to the reaction, 2 moles of magnesium reacts with 1 mole of oxygen, then 0.0987 moles of magnesium will react with:
[tex]=\frac{1}{2}\times 0.0987 mol=0.04935\text{mol }O_2[/tex]
Moles of oxygen required = 0.04935 mol
The mass of 0.04935 moles of oxygen :
[tex]=0.04935\times 31.999 g/mol=1.579 g\approx 1.6 g[/tex]
1.6 grams of oxygen will react with 2.4 grams of magnesium.
Learn more about the unitary method and moles here:
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You decide to clean the bathroom. You notice that the shower is covered in a strange green slime. You decide to try to get rid of this slime by adding lemonade juice. You spray half of the shower with lemonade juice and spray the other half of the shower with water. After 3 days of spraying equal amounts 3 times a day, there is no change in the appearance of the green slime on either side of the shower. How many trials are being performed in this example?
Answer:
3
Explanation:
advantages and disadvantages of chemical
Answer:
Advantages :they are used for seeing chemical reactions .
they are used for doing chemical experiment .
they are used for making affective medicines .
Disadvantages :they harms to our environment.
they can make side effects in our body by affective medicines made by chemicals.
while doing different unknown experiments they make explosions which can also harm to us.
What did Ernest Rutherford’s gold foil experiment demonstrate about an atom?
Each atom is composed of electrons and positive material.
The mass of the atom is evenly spread throughout the atom.
Neutrons are located in the center of the atom.
Positive charge occupies a very small volume in the atom.
Answer:
I believe its the last one
Explanation:
The gold-foil experiment showed that the atom consists of a small, massive, positively charged nucleus with the negatively charged electrons being at a great distance from the centre. Niels Bohr built upon Rutherford's model to make his own.
A ___________
is a process that occurs when
one or more substances are changed into one or more new
substances. For example, when zinc and sulfur are mixed
together with the addition of energy in the form of heat, zinc
sulfide (ZnS) is produced.
Answer:
Reaction??
Explanation:
Balance and classify the following equations as synthesis, decomposition, single replacement, double replacement, or combustion: a. C4H10 + 02 -> CO2 + H20 Reaction Type: b. ___ HNO3 + Mg(OH)2 -> Mg(NO3)2 + H20 Reaction Tyne.
Stars with a greater overall mass are and , and they consume their nuclear fuel .
Answer:
they will expand
Explanation:
as they bring out they become red giants then eventually white dwarfs or the scarier options a black hole
