A. The mass of the oxygen gas collected is 0.317 g
B. The mass of potassium chlorate that decomposed is 0.81 g
A. How to determine the mass of oxygen collected Volume (V) = 0.250 LTemperature (T) = 26 ˚C = 26 + 273 = 299 KPressure (P) = 765 – 25.22 = 739.78 torr = 739.78 / 760 = 0.973 atmGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) =?The number of mole can be obtained as by using the ideal gas equation as illustrated below:
n = PV / RT
n = (0.973 × 0.25) / (0.0821 × 299)
n = 0.0099 mole
Thus the mass of oxygen collected can be obtained as follow:
Mole of oxygen = 0.0099 mole Molar mass of oxygen = 32 g/mol Mass of oxygen =?Mass of oxygen = mole × molar mass
Mass of oxygen = 0.0099 × 32
Mass of oxygen = 0.317 g
B. How to determine the mass KClO₃Balanced equation
2KClO₃ —> 2KCl + 3O₂
From the balanced equation above,
3 moles of O₂ were obtained from 2 moles of KClO₃
Therefore
0.0099 mole of O₂ will be obtained from = (0.0099 × 2) / 3 = 0.0066 moles of KClO₃
Thus, the mass of KClO₃ that decomposed can be obtained as follow:
Mole of KClO₃ = 0.0066 mole Molar mass of KClO₃ = 122.5 g/molMass of KClO₃ =?Mass = mole × molar mass
Mass of KClO₃ = 0.0066 × 122.5
Mass of KClO₃ = 0.81 g
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How much heat is released as the temperature of 465 g of water drops from 75.0°C to 18.2°C?
The heat released : -110560.632 J
Further explanationHeat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
Knownm =465 g
c water = 4.186 J/gram °C
∆T = temperature difference = 18.2 - 75 = - 56.8 °C
Then the heat :
[tex]\tt Q=m.c.\Delta T\\\\Q=465\times 4.186\times -56.8\\\\Q=\boxed{\bold{-110560.632~J}}\rightarrow -=exothermic[/tex]
Which compound (A,B or C) is most likely an ionic compound?
Answer:
B
Explanation:
I believe it is compound B, because ionic compounds can form crystals, and they can conduct electricity when dissolved in water.
I hope it helps!!
Compound B is an ionic compound as it is hard,brittle and conducts electricity.
What is an ionic compound?Ionic compound or electrovalent compound is a type of compound which is formed between two elements when there is an exchange of electrons which takes place between the atoms resulting in the formation of ions.
When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge and forms an ion called the anion.
As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond.They are hard, malleable, ductile and good conductors of heat and electricity.They have high boiling points.
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significant figures in the measurement 0.070020 meter?
Answer:
There are 5 significant figures
There are five significant figures in the measurement 0.070020 meter.
What do you mean by significant figure ?Significant figures are the number of digits that add to the correctness of a value, frequently a measurement.
The first non-zero digit is where we start counting significant figures. Determine how many significant digits there are given a range of numbers.
The crucial or important digits that accurately represent the meaning of a certain number are known as the significant figures of that number. 6.658, for instance, has four significant digits. These huge amounts give the numbers accuracy.
In the given example there are five first non-zero digit are present.
Thus, There are five significant figures in the measurement 0.070020 meter.
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A solution of naoh has a concentration of 25% by mass. what mass of naoh is present in 0.250 g of this solution? use the periodic table in the toolbar if needed. g
The mass of NaOH present in the solution is, 0.0625 grams
What will be the Mass?The mass is defined as the quantity of the matter present in the solution or in any substance.
Given that,
Mass % of NaOH in the solution= 25 %
Mass of solution = 0.250 g
The formula will be
[tex]\rm Mass\ percent=\dfrac{mass \ of\ NaOH}{Mass\ of\ solution} \times 100[/tex]
[tex]25=\dfrac{\rm Mass\ of \ NaOH}{0.250} \times 100[/tex]
Mass of NaOH=0.0625 gram
Thus the mass of NaOH present in the solution is, 0.0625 grams
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The mass of NaOH present 0.250 grams of solution is 0.0625 grams.
How we calculate the mass?Mass of any substance present in any solution will be calculated by using their & mass as below:
Mass percent = (Mass of solute / Mass of solution) × 100
Given items according to the question,
% mass of NaOH = 25%
Mass of solution = 0.250g
Now e put these values on the above equation and we get,
Mass of NaOH = (5 × 0.250) / 100 = 0.0625 grams.
Hence, mass of NaOH is 0.0625 grams.
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Some children pass around a block of ice. Their hands feel cold and wet. Why do the children feel cold on touching the ice block?
(middleschool)
Answer:
See below.
Explanation:
The children feel cold on touching the ice block as the temperature of it is much less than body temperature.
A sample of 3.05 g of banana was burned in a coffee cup calorimeter filled with 500.0 g of water. the heat released caused the temperature of the water to increase 5.7°c. note: heat capacity, c, of the water is 1.00 cal/g･°c.
calculate the caloric content of the banana in nutritional calories per gram. remember a nutritional calorie (c) is 1 kcal.
The caloric content of the banana in nutritional calories per gram is :
934.4 cal/g
Given data :
mass of banana ( Mb ) = 3.05 g
mass of water ( Mw )= 500 g
change in temperature ( ΔT ) = 5.7°c
Cw = 1.00 cal/g･°c.
Determine the caloric content of the bananaFirst step : calculate heat released
Qw = Mw* Cw * ΔT
= 500 * 1 * 5.7
= 2850 cal
Next step : Calculate the caloric content of the banana
caloric content = Qw / Mb
= 2850 cal / 3.05 g
= 934.4 cal/g
Hence we can conclude that The caloric content of the banana in nutritional calories per gram is : 934.4 cal/g
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Methane is the main constituent of a fossil fuel.
(i) Name this fossil fuel.
Answer:
natural gas
Explanation:
natural gas is formed deep beneath Earth's surface which primarily consist of methane.
methane is considered cleanest burning fuel.
**Please answer quickly!** 5.1169 mol of Ne is held at 0.9148 atm and 911 K. What is the volume of its container in liters?
Answer:
418.352441397 Liters
Explanation:
You start off with your equation of PV=nRt, where P= Pressure, V= Volume, n= The amount of moles, R= the gas constant which is 0.0821, and t= The temperature.
You are solving for volume so you would divide the left side by P so you can isolate the Volume. Now you have V=nRt/P.
Next you would fill in all of the variables. n=5.1169, R=0.0821, t=911K, and P=0.9148atm.
You would get the equation V=(5.1169*0.0821*911)/0.9148
Your final answer would be 418.352441397 Liters, or rounded to 418.35 Liters.
The volume of the container is 418.15 L
Ideal gas lawFrom the question, we are to determine the volume of the container
From the ideal gas equation, we have that
PV = nRT
Where P is the pressure
V is the volume
n is the number of moles
R is the gas constant ( R = 0.08206 L.atm.mol⁻¹.K⁻¹)
and T is the temperature
From the given information
P = 0.9148 atm
n = 5.1169 mol
T = 911 K
Putting the parameters into the formula, we get
0.9148 × V = 5.1169 × 0.08206 × 911
Then,
[tex]V = \frac{5.1169 \times 0.08206 \times 911}{0.9148}[/tex]
V = 418.15 L
Hence, the volume of the container is 418.15 L
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What does the abreviation asa stand for chemically?.
Answer:
it stands for Acrylonitrile styrene acrylate
Explanation:
WHAT DO YOU UNDERSTAND BY OLFACTORY INDICATORS?
Answer:
An Olfactory Indicator is a chemical that changes it's scent. This depends on whether it is mixed with an acid or base solution. When mixed, it's called "olfactory titration."
Explanation:
Hope I helped :)
-
8. What is the balanced equation when aluminum reacts with copper (II) sulfate?
a. Al + Cu S Al S + Cu
b. 2A1+ 3CuSO4 → Al2(SO4)3 + 3Cu
c. Al + CuSO4 → AISO4 + Cu
d. 2Al + CuSO4 → Al SO4 + 2Cu
Answer:
b. 2A1 + 3CuSO4 → A12(SO4)3 + 3Cu
2Al + 3CuSO4 => (Al)²(SO4)³ + 3Cu
Your answer is letter b :)
3. There are seven periods in the periodic table. Why are the elements arranged into these seven periods?
Answer:
Period 6 and 7
tbh i dont know the answer but the explanation
Explanation:
Period 6 and 7 have 32 elements because the two bottom rows that are separated from the rest of the table belong to those periods. They are pulled put in order to make the table itself fit more easily onto a single page
i hope that helps :)
Derrick decided to research what factors might affect the properties of the solubility of a solution. After completing his research, Derrick knew that several factors affected the properties of solubility. Explain the factors that affect the properties of the solubility of a solution.
Answer:
Solubility refers to the maximum amount of solute that dissolves in a given amount of solvent at a particular temperature Factors Affecting Solubility 1. Effect of Temperature For some substances to dissolve in a given solvent, heat is absorbed. The reaction is endothermic. In this case, an increase in temperature increases solubility.
Explanation:
Solubility of a solution is affected by properties like temperature and pressure.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
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Pls help with chemistry
The answer is D.
Activated complex
Why is a typical car battery in a car is filled with a solution of sulferic acid
Answer:
Sulfuric acid has a higher density than water, which causes the acid formed at the plates during charging to flow downward and collect at the bottom of the battery.
What evidence did you see of the microscope resolving power
What is the electron configuration of the chloride ion?
Answer:
La configuración electrónica del cloruro es 1s2 2s2 2p6 3s2 3p6.
Explanation:
Determine the name of each ionic compound. Spelling counts.
KZP:
Allz:
MgO:
An ionic compound is a type of chemical compound composed of positively charged ions (cations) and negatively charged ions (anions) held together by electrostatic forces. The correct answer is:
[tex]K_3P[/tex] : potassium phosphide
[tex]AlI_3[/tex] : aluminum iodide
[tex]MgO[/tex] : magnesium oxide
Ionic compounds are formed through ionic bonding, which involves the transfer of electrons from one atom to another.
In an ionic compound, the cations and anions are attracted to each other due to their opposite charges, forming a crystal lattice structure. The cations are usually metal ions, while the anions are typically non-metal ions. The transfer of electrons creates ions with full outer electron shells, resulting in the formation of stable compounds.
Therefore, the correct answer is:
[tex]K_3P[/tex] : potassium phosphide
[tex]AlI_3[/tex] : aluminum iodide
[tex]MgO[/tex] : magnesium oxide
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What type of crystal is this? Very important!!!
Answer:
ruby
Explanation:
Students put a ballon on a top of a bottle of water. The students placed the bottle in a container of very hot water and the ballon began to expand. A) All of the water evaporated B) The gas in the bottle expanded as it became warmer C) Some of the gas in the bottle condensed to liquid water D) the water expanded into the ballon as it became warmer
Answer:
b
Explanation:
Which of the following statements explains the solubility of ionic substances in water?
O Water is a covalent substance.
O The molar mass of water is 18.02 g/mol.
O An oxygen atom has 6 valence electrons.
O Water molecules are polar.
Answer:
Explanation:
The statement which explains the solubility of ionic substances in water is Water molecules are polar.
What is an ionic compound?Ionic compounds contain ions and are held together by the attractive forces among the oppositely charged ions.
Most ionic compounds are soluble in water. Polar water molecules have a strong attraction for charged ions and the charged ions become solvated as they dissociate into the water and ionic compounds are soluble in water.
Break apart of ionic compounds into the ions that make them up through a process called dissociation. All ionic substances are dissociated in water but dissociation may vary.
Water is a polar covalent and all polar covalent substances dissolve in the water because polar water molecules form hydrogen bonds with ions which allow compounds to disperse in water.
Hence, option D is correct.
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how many layers are there in the earth
Answer:
3 i think
Explanation:
The Earth is divided into three main layers. The dense, hot inner core (yellow), the molten outer core (orange), the mantle (red), and the thin crust (brown), which supports all life in the known universe. Earth's interior is generally divided into three major layers: the crust, the mantle, and the core.
Once nonrenewable resources like oil, natural gas and uranium are used up, there ___________ be any more in your lifetime. will or wont?
Answer:wont
Explanation:
I need help with this please
True or false? Acid strength and acid concentration both mean the same thing.
Answer:False
False
Explanation:acid concentration and acid strength are two completely different
it is false..hope it helps you
Which term refers to the number of moles of solute per liter of solution?.
Answer:
Molarity I believe
Does the metals determine how high or low voltage is in fruit battery?
Or is it the pH level in fruits that determines voltage? also can you give a source to this.
Answer: 1.788 volts.
Explanation:
To solve this problem we can combine battery cells to create higher voltages. Building more lemon batteries and connecting them with a metal wire from "+" to "-" adds the voltage from each cell. The two lemon batteries above, combine to produce a voltage of 1.788 volts.
Seesee said it would be fun to travel 134 km/h. If she was able to drive that fast for 7.5 h, how far would she have traveled?
Answer:
The answer is 1005 kmExplanation:
The distance covered by an object given it's velocity and time taken can be found by using the formula
distance = velocity × timeFrom the question
velocity = 134 km/h
time = 7.5 hr
We have
distance = 134 × 7.5
We have the final answer as
1005 kmHope this helps you
What’s the answer?????
Answer:
kinetic energy
potential energy
kinetic energy
kinetic energy
Explanation:
kinetic energy- energy associated with motion
potential energy- the energy that a piece of matter has because of its position or nature.
energy is transmitted only in indivisible, discrete quantities called
Answer:
photon
Explanation:
Energy usually travel in a discrete quantities which are very indivisible, this quantity is known as Photons.
A photon can be regarded as a smallest discrete quantum of electromagnetic radiation. It can be referred to as basic unit of all light. Photons are particles which are always in motion, they usually travel in vacuum at a speed of light.The photon are elementary particle with no mass and serve as quantum of the electromagnetic field as well as electromagnetic radiation such as light , Their velocity is [tex]2.998 x 10^8 m/s.[/tex]
Therefore, photon is an elementary particle.
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