Answer:
As a substance melts, and goes from a solid to a liquid state, the kinetic energy of the molecules increases, and the molecules move faster, and they separate further and further away from each other. The intermolecluar forces holding the molecules together become weaker. This is why a liquid can take fill the shape of its container, whereas a solid has a fixed shape.
Explanation:
take your notes man
Calculate the number of water (H2O) molecules produced from the decomposition of 75.50 grams of Iron (III) hydroxide (Fe(OH)3).
Answer: [tex]6.38\times 10^{23}[/tex] molecules of water are produced.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} Fe(OH)_3=\frac{75.50g}{106.8g/mol}=0.707moles[/tex]
The balanced chemical reaction is:
[tex]2Fe(OH)_3\rightarrow Fe_2O_3+3H_2O[/tex]
According to stoichiometry :
2 moles of [tex]Fe_2O_3[/tex] produce = 3 moles of [tex]H_2O[/tex]
Thus 0.707 moles of [tex]Fe_2O_3[/tex] will produce=[tex]\frac{3}{2}\times 0.707=1.06moles[/tex] of [tex]H_2O[/tex]
According to avogadro's law, 1 mole of every substance contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
Thus 1.06 moles of [tex]H_2O[/tex] contains = [tex]\frac{6.023\times 10^{23}}{1}\times 1.06=6.38\times 10^{23}[/tex] molecules
Answer:
6.381 x 10^23
Explanation:
What does Aluminum and Magnesium oxide create
Answer: MgAl2O4 or Spinel (gemstone)
Explanation:
Which sentence best describes the relationship between genes and chromosomes?
A.
Genes are found within chromosomes.
B.
Several chromosomes make up one gene.
C.
Genes and chromosomes are the only things that form the nucleus.
D. Several genes are attached to different parts of the Golgi apparatus.
Answer:
A
Explanation:
Which term describes this diagram?
A) Element
B) Compound
C) Mixture
Answer:
b
Explanation:
1.
What is the molarity of a 3.6 L solution with 104 g of sucrose?
Answer:
.084 M
Explanation:
Molar mass of sucrose = 342.3
The formula to find molarity is moles of solute / liters of solution
Since we need to turn grams to moles for this equation we do 104 / 342.3 = 0.304
Now we can use the equation listed above. .304 / 3.6 = 0.084 M
An unknown mass of Al absorbs 187.9 J of heat and increases its temperature from 23.5 °C to 35.6 °C. What is the mass of the
aluminum?
Where:
Specific Heat of Aluminum is = 0.900 J/gºC
Answer:
mass = 17.2 grams
Explanation:
q = mcΔT => m = q/cΔT = 187j / (0.90j/g°C)(35.6°C - 23.5°C) = 17.2g
the charge of the atom is
Answer:
the charge of an atom is zero.
Explanation:
i hope this is what you were asking for.
Which of the following represents an increase in kinetic energy?
A. Cooling steam from 165°C to 100°C
B. Melting 45g of ice
C. Condensing 60g of steam
D. Heating ice from -50°C to 0°C
Answer:
C
Explanation:
2. Which number in a chemical formula tells you how many molecules of
an element or compound you have? *
A. Coefficient
B. Chemical symbols
C. Subscript
D. Capitals
A 50.00 L sample of gas collected in the upper atmosphere at a pressure of 18.30 torr is compressed into a volume of 0.1500 L. What is the final pressure?
Answer:
the ans is in the picture with the steps
(hope it helps can i plz have brainlist :D hehe)
Explanation:
The concept Boyles law is used here to determine the final pressure of the gas. Boyle's law was put forward by the Anglo-Irish chemist Robert Boyle in the year 1662. The final pressure of the gas is 7.66 atm.
What is Boyles law?At constant temperature, the volume of a given mass of gas is inversely proportional to its pressure. It can also be explained as at constant temperature, the product of pressure and volume of a given mass of gas is constant.
A straight line graph is obtained when pressure is plotted against the inverse of the volume.
Mathematically the law can be expressed as:
V∝ 1/P
PV = k (Constant)
Here 'V' is the volume and 'P' is the pressure of the gas.
For two different gases, the equation is given as:
P₁V₁ = P₂V₂
P₂ = P₁V₁ / V₂
1 torr = 0.00131 atm
P₁ = 0.023 atm
0.023 × 50.00 / 0.1500 = 7.66 atm
Thus the final pressure is 7.66 atm.
To know more about Boyles law, visit;
https://brainly.com/question/30367133
#SPJ2
Tetrachloroethene, C2C14 is a solvent used in many dry cleaning processes.
Write the empirical formula for tetrachloroethene.
An empirical formula presents the atoms of all the elements with the most simplified whole number ratios. In other words, divide each subscript by their greatest common factor.
The greatest common factor of 2 and 4 is 2.
2/2 = 1
4/2 = 2
So, the empirical formula for tetrachloroethene is CCl₂.
why does hexane have the weakest intermolecular force?
Answer:
The only intermolecular forces present in the compound Hexane are London dispersion forces which are generally the weakest. Hexane's molecular structure proves that Dipole-Dipole forces wont exist as there aren't very polar bonds in the structure.
HELP!
NaCl is made from 1 Na and 1 Cl. If I have 45.978 grams of Na, how many grams of NaCl can I make? (You will have to convert to moles of Na first!)
explain answer
Answer:
116.88 g
Explanation:
Step 1: Write the balanced equation for the synthesis of NaCl
Na + 1/2 Cl₂ ⇒ NaCl
Step 2: Calculate the moles corresponding to 45.978 g of Na
The molar mass of Na is 22.990 g/mol.
45.978 g × 1 mol/22.990 g = 1.9999 mol
Step 3: Calculate the number of moles of NaCl formed from 1.9999 moles of Na
The molar ratio of Na to NaCl is 1:1. The moles of NaCl formed are 1/1 × 1.9999 mol = 1.9999 mol.
Step 4: Calculate the mass corresponding to 1.9999 moles of NaCl
The molar mass of NaCl is 58.443 g/mol.
1.9999 mol × 58.443 g/mol = 116.88 g
An elastic band with a spring constant of 62 N/m is extended by 0.15 m. What is the force applied to the rubber band?
Answer:
the force applied to the rubber band is -9.3N
Explanation:
The computation of the force applied to the rubber band is shown below;
We know that
Force in newtons = Spring constant × amount of extension
F = -k × x
where
-k = 62 N/m
And, x = 0.15m
So, the force applied is
= -62N/m × 0.15m
= -9.3N
hence, the force applied to the rubber band is -9.3N
the force applied to the rubber band is -9.3N
Explanation:
Please help i need help with this (if you can’t see the last one it says thermal)
Answer:
it would have sound a
thermal .why a train needs coal and coal get burned by heat that is thermal energy and sound beacuse a train makes sound by moving
Explanation:
have a good day /night
may i please have a branlliest
How many liters of O2 would be needed to produce 5.75 moles of K₂O?
Answer:
just 1
Explanation:
In a nuclear power plant, what is the purpose of the cooling tower?
cools down the electric generator
reduces heat pollution to the environment
pumps cool water into the reactor
Answer:
reduces heat pollution to the environment
PLEASE HELP
Find the kinetic energy of the horse using KE=1/2mv^2.
Answer:
78878
Explanation:
Which of these can be recycled in an attempt to conserve resources?
aluminum
natural gas
sunlight
gasoline
Answer:
aluminum
Explanation:
Hope this helped!!!
1. Identify the reactants in this chemical equation:
2H2 + O2 + 2H2O
Is a shrimp an arachnid?
is a pill bug a insects, arachnid, or crustaceans?
is a scorpions a insects, arachnid, or crustaceans?
Answer:
Insects belong to the class Insecta, and arachnids to the class Arachnida; both classes fall under the Arthropoda phylum, along with crustaceans (crabs, lobster and shrimp). All arthropods have an exoskeleton and jointed legs. They have segmented bodies and appendages, which are divided into different segments. Arachnids belong to an even larger group of animals called “arthropods” which also include insects and crustaceans (lobster, crabs, shrimp, and barnacles).
Explanation:
What are the 3 main types of clouds?
Answer:
Cumulus, Cirrus, and Stratus
Explanation:
So Cumulus Clouds are those puffy-shaped clouds, the ones that look the most solid like you could just walk on them. Cirrus are those wispy clouds that are often very high up. And Stratus Clouds are the low clouds that often cover the entire sky.
hope this helps:)
How is the motion of particles in a book different from the motion of particles in the air around it ? (dont put link)
Answer:
the motion is different.
Explanation:
the the motion is different because the particle in a book is solid particles and solid are packed together so so they can't move freely but while the the particles in the air around it is gas particles and it are packed very loose and can move very easily anywhere like .Example - solid-book , eraser. gas-helium, oxygen.
How is pascals law used in the brakes of a car?
I’m giving 67 points!
Answer:
A change in pressure at any point in an enclosed fluid at rest is transmitted undiminished to all points in the fluid. With that said; in a hydraulic brake system, if the piston in the master cylinder(the part your foot pushes on) is one inch square area and you push with 100 pounds, then 100 pounds per square inch is transmitted to all parts of the hydraulic system. Now if the brake caliper piston(the part that pushes against the brake pad) is 2 square inches then there will be a total of 200 lbs of force being applied by the wheel cylinder, because each square inch has 100 pounds pushing on it. This is basically how cars brake systems are designed in order to reduce the amount of force required by the driver.
Btw if u want to give 67 points u must multiply that by 2 since two people answer and they get half of 67. Im still happy with my 34 though!
A woman needs a kidney transplant. The best candidate to donate a kidney to her is her
es -0)
A)
Co-Worker.
B)
daughter.
09
friend.
D
husband.
Answer: B
Explanation:
how to calculate density (what’s the formula)
density=_ divided by _
Answer:
density equals weigt divided by volume
Explanation:
[tex]density = \frac{m}{v} [/tex]
Calculate the volume in mL of 53.2 g of .251M solution of HCl.
Show work please
Answer:
5.813 mL
Explanation:
You need to use the formula : vol = mass / molar mass x molarity
the molar mass of HCl is 36.46 and the problem gives you the rest of the equation
0.251M x 36.46 = 9.151
53.2g / 9.151 = 5.813 mL
*I don't know some of the units so that's why some of them are blank sorry
*I'm also sorry if this is wrong but it's what I did so..
Use the following equation to answer the questions that follow.
Fe + 2 HCl --> FeCl2 + H2
a. If you have 3.000 moles of HCl, how many moles of gas could you make?
b. If you have 6.132 moles of each reactant, which one will run out first?
c. Based on your answer from (b), how many grams of FeCl2 would you expect to make?
d. How many moles of Excess Reactant reacted based on (b)?
e. How much Excess Reactant is left over, in moles, from (b)?
f. When actually carrying out the experiment with 6.132 moles of each reactant, you make 310.2grams of iron(II) chloride. What is your percent yield?
What is the total number of grams of potassium fluoride
(molar mass = 58 g/mol) needed to make 9.4 liter of a 6.17 M solution?
Explanation:
molarity=no. of moles of solute/solution in litres
6.17M=no. of moles of solute/9.4 L
6.17×9.4=no. of moles of solute
57.9 =no. of moles of potassium fluoride KF
no. of moles=given mass /molar mass
57.9=given mass/58
3358.2 g
What does the area between points D and E represent for the substance on the heating curve below?
A freezing point
B melting point
C boiling point
D sublimation point
Answer:
C. Boiling Point
Explanation:
A to B represents heat being added to the substance in a solid state, making B to C the melting point. C to D represents heat being added to the substance in a liquid state, making D to E the boiling point as the liquid is converted to a gas.
Hope this helps!