Answer:
Static Electricity! :)
Explanation:
how many molar mass are in k0h?
Answer: 105 u
Explanation:
It is best to say that electric motors require _______ to work. a. a continuous current b. a galvonometer c. a generator d. energy
How many grams of calcium carbonate must be decomposed to produce 5.00 L of carbon dioxide at 901 mmHg and 0'C?
26.3 grams of calcium carbonate must be decomposed to produce 5.00 L of carbon dioxide at 901 mmHg and [tex]0^0C[/tex]
Explanation:
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = 901 mm Hg = 1.18 atm (760 mm Hg = 1 atm)
V = Volume of gas = 5.00 L
n = number of moles = ?
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]0^0C=(0+273)K=273K[/tex]
[tex]n=\frac{PV}{RT}[/tex]
[tex]n=\frac{1.18atm\times 5.00L}{0.0821L atm/K mol\times 273K}=0.263moles[/tex]
The chemical reaction for the decomposition of calcium carbonate follows the equation:
[tex]CaCO_3(s)\rightleftharpoons CaO(s)+CO_2(g)[/tex]
According to stoichiometry:
1 mole of carbon dioxide is produced by = 1 mole of calcium carbonate
Thus 0.263 moles of carbon dioxide is produced by = [tex]\frac{1}{1}\times 0.263=0.263[/tex] moles of calcium carbonate
Mass of calcium carbonate=[tex]moles\times {\text {Molar mass}}=0.263mol\times 100g/mol=26.3g[/tex]
26.3 grams of calcium carbonate must be decomposed to produce 5.00 L of carbon dioxide at 901 mmHg and [tex]0^0C[/tex]
Which of the following best expresses the definition of a closed system? (2 points) Energy can enter or leave the system but matter cannot. Heat and matter are both able to enter or leave the system. Matter can enter or leave the system but energy cannot. Heat and matter can enter the system but cannot leave the system.
1. A solution was made by dissolving 0.837g of Ba(OH)2 in 100 mL of solution. What is the pOH and pH of the solution?
2. What is the percentage ionization of 1.0M acetic acid? What is the pH of this solution?
Answer:
1. pOH = 1.01 and the pH = 12.99.
2. a) %I = 0.417 %, b) pH = 2.34.
Explanation:
1. The pH of the dissolution of Ba(OH)₂ in water can be calculated using the following equation:
[tex]pH = 14 - pOH = 14 - (-log[OH^{-}]) = 14 + log[OH^{-}][/tex]
To find the pOH, first, we need to calculate the concentration (C) of Ba(OH)₂:
[tex] C_{Ba(OH)_{2}} = \frac{\eta}{V} = \frac{m}{M*V} [/tex]
Where:
η: is the number of moles of Ba(OH)₂
V: is the volume of the solution = 100 ml = 0.100 L
M: is the molar mass of Ba(OH)₂ = 171.34 g/mol
m: is the mass of Ba(OH)₂ = 0.837 g
[tex] C_{Ba(OH)_{2}} = \frac{m}{M*V} = \frac{0.837 g}{171.34 g/mol*0.100 L} = 0.049 mol/L [/tex]
Knowing that in 1 mol of Ba(OH)₂ we have two moles of OH⁻, the concentration of OH⁻ is:
[tex] C_{OH^{-}} = \frac{2*\eta_{Ba(OH)_{2}}}{V} = 2*C_{Ba(OH)_{2}} = 2*0.049 mol/L = 0.098 mol/L [/tex]
Now, we can find the pOH and the pH of the solution:
[tex] pOH = -log[OH^{-}] = -log(0.098) = 1.01 [/tex]
[tex] pH = 14 - pOH = 14 - 1.01 = 12.99 [/tex]
2. a) The percentage of ionization (% I) of acetic acid can be calculated using the following equation:
[tex]\% I = \frac{[H^{+}]_{eq}}{[HA]_{0}}*100[/tex]
We need to find the [H⁺] = [H₃O⁺] at the equilibrium:
CH₃COOH(aq) + H₂O(l) → CH₃COO⁻(aq) + H₃O⁺(aq)
1.0 - x x x
[tex] Ka = \frac{[CH_{3}COO^{-}]*[H_{3}O^{+}]}{[CH_{3}COOH]} [/tex]
Ka: is the dissociation constant of acetic acid = 1.75x10⁻⁵
[tex] 1.75\cdot 10^{-5} = \frac{x^{2}}{1.0 - x} [/tex]
[tex] 1.75\cdot 10^{-5}(1.0 - x) - x^{2} = 0 [/tex] (1)
By solving equation (1) for x we have two solutions:
x₁ = -0.00417
x₂ = 0.00417 = [H₃O⁺] = [CH₃COO⁻]
We will take the positive value to find the percentage ionization:
[tex]\% I = \frac{[H^{+}]_{eq}}{[HA]_{0}}*100 = \frac{0.00417 M}{1.0 M}*100 = 0.417 \%[/tex]
b) The pH of the solution is:
[tex] pH = -log([H_{3}O^{+}]) = -log(0.00417) = 2.34 [/tex]
I hope it helps you!
List some common liquids that you think are acidic or basic. For example, do you think orange juice is acid or base? Why do you think each liquid is an acid or base?
if you had a neurological disorder affecting your thermoreceptors what symptom would you experience??
quick answers pleasee
Answer:u got me stumped
Explanation:
Using the table on the right, complete each calculation by typing in the correct answer.
13.2L= ? mL
Answer:
13,200 mL
Explanation:
multiply by 1000 to go from L to mL
What are the two major political parties in the United States, now?
Democrats and Republicans
5 uL of a solution is equal to
how many nanoliters?
Answer:
5000 nL
Explanation:
Answer: 5000 nL
Explanation:
What are some of the factors that can affect the equilibrium of a chemical reaction?
Answer: Removing Products, Adding Products, Changes in Volume and Pressure, and Changes in Temperature
What might happen if an octopus we're chased by a predator
Answer:
They will try to defend themselves
Explanation:
Answer:
octopuses will shoot a dark liquid, sometimes called ink, at the thing that scared them. ... If an octopus does get caught — no problem. They can lose arms and regrow them.
Explanation:
How many ml of solution are needed to make a 5.78 M solution with 2.98 moles of CaO?
Answer:
515.6 mL
Explanation:
Please see the step-by-step solution in the picture attached below.
Hope this answer can help you. Have a nice day!
The number of mL of the solution needed to make a 5.78 M solution with 2.98 moles of CaO is 516 mL.
The number of moles that is present in a liter of solution is regarded to be the Molarity of the solution that is measured in mol/L.
[tex]\mathbf{Molarity = \dfrac{number\ of \ moles(n)}{Volume \ (in \ liters)}}[/tex]
[tex]\mathbf{Molarity = \dfrac{2.98 moles }{5.78 \ mol/ L}}[/tex]
Molarity = 0.51557 L
If 1 Liter of solution contains 1000 mL, then 0.51557 L will contain:
= 0.516 × 1000 mL
= 516 mL of solution.
Therefore, we can conclude that the number of mL of the solution needed to make a 5.78 M solution with 2.98 moles of CaO is 516 mL.
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_____________________________ makes the Sun appear to move across the sky
Answer:
The answer to the question is orbit
please help w #64
what type of chemical reaction is it?
Answer:
Complete ionic equation
Explanation:
For every reaction, we could write the molecular equation as well as the ionic equation. The net ionic equation only shows the reaction of the main ions that take part in the reaction. It does not show the reaction of spectator ions.
In order to write the complete ionic equation for any reaction, we must observe the following steps;
We have to start by writing a balanced molecular equation for that particular reaction. Secondly, we split up the soluble strong electrolytes solutions into their constituent ions. It is necessary to indicate the correct formula and charge for each ion participating in the reaction. The individual stoichiometric coefficients of each ion is used toindicate the correct number of all the participating ions. All compounds formed during the reaction are noted with the appropriate symbols (s) for solid, (l) for liquid, or (g) for gaseous respectively.
what kind of nuclear reaction is seen in the picture above? A.Nuclear Fission
B.Alpha Decay
C.Nuclear Fusion
D.Beta Decay
PLEASE ANSWER ASAP
Answer: Nuclear Fission
Answer:
Beta Decay
Explanation:
how many grams of oxygen are produced if 25.0g of potassium chlorate decomposes according to the reaction 2KCLO3 —-> 2KCL +3O2
Answer:
approximately 15.1 grams.
Explanation:
The key to chemistry is to change everything to moles. Then when you have the answer in moles change the answer back to grams, liters, or whatever you want.
change 25 grams of potassium chlorate to moles.
calculate the gram molecular mass of potassium chlorate.
Chlorate is Cl with 3 oxygens. ate = saturated. Chlorine has seven valance electrons when it is saturated six of these electrons are used by oxygen ( 2 electrons per oxygen) leaving only 1 electron.
1 K x 39 grams/mole
+1 Cl x 35.4 grams/ mole
+3 O x 16 grams/ mole
= 122.4 grams / mole Potassium Chlorate
25
122.4
= moles.
2.05 moles of Potassium Chlorate.
There is a 1:1 mole ratio. 1 mole of Potassium Chlorate will produce 1 mole of Potassium Chloride.
2.05 moles of Potassium Chlorate will produce 2.05 moles of Potassium Chloride.
Find the gram molecular mass of Potassium Chloride.
1 K x 39 = 39
+1 Cl x 35.4 = 35.4
= 74.4 grams / mole.
2.05 moles x 74.4 grams/ mole = 15.2 grams
Hope it helps :)
Answer:
9.79g of O2
Explanation:
So this question you are trying to go from g of KCLO3 to grams of oxygen. There is no direct conversion so you have to utilize multiple process.
[tex]25.0g KCLO3 * \frac{1mol KCLO3}{122.55 gKCLO3} * \frac{3mol O2}{2 mol KCLO3} * \frac{32.00g O2}{1mol O2}[/tex]
=9.79 g of O2
So first you go from g of KCLO3 to moles of KCLO3 by using molar mass of KCLO3. Then you use mol:mol ratio from balanced equation to go to moles of O2, and finally use molar mass of O2 to go to grams of O2.
How many moles of H3PO4 are produced when 71.0 g P4O10 reacts completely to form H3PO4?
P4O10(s) + H2O(l) → H3PO4(aq)
Answer:
1.00 mol
71.0g P4 0 10 1mol p4 0 10 4 moles H3 PO4
____________ x ___________ x ______________
1 283.886g P4 0 10 1mol P4 0 10
= 1.00 moles H3 PO4
1.00 moles of H₃PO₄ are produced
Given:
Mass of P₄O₁₀ = 71.0 g
To find:
Moles of H₃PO₄ = ?
Balanced chemical reaction:
P₄O₁₀(s) + H₂O(l) → H₃PO₄(aq)
Molar mass of P₄O₁₀ = 283.866 g or 284 g
Calculation for moles:Number of moles is defined as given mass over molar mass.
[tex]\text{Moles of } H_3PO_4= \frac{71.0 g P_4O_{10}}{1} \times \frac{1 mol P_4O_{10}}{283.886 g P_4O_{10}} \times \frac{4 moles H_3PO_4}{1 mol P_4O_{10}} \\\\\text{Moles of } H_3PO_4= 1.00 mol[/tex]
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the volume of one mole of a substance is 22.4 L at STP for all what
Answer:
The molar volume of a gas is the volume of one mole of a gas at STP. At STP, one mole (6.02 × 1023 representative particles) of any gas occupies a volume of 22.4 L (Figure below). A mole of any gas occupies 22.4 L at standard temperature and pressure (0°C and 1 atm).
Explanation:
the particle picture is best described as...
an element
an atom
a compound
a pure substance
both a pure substance and a compound
Answer:
Both are pure substances and a compound
Which statements describe an ideal gas
Answer:smoke
Explanation:smoke is a gas
help please place the ph test papers I️n order from most acidic to most alkaline
Answer:refer to the image below
Data
Record your data either in your lab notebook or in the space below.
Time
Radioactive Atoms
0.5"
Half-Life
Minutes
Predicted
Simulated
Cycles, n
Acted out
0.0
100
Initial = 0
100
1
100
0.5
1
2.
1.0
1.5
3
2.0
4
2.5
5
3.0
6
3.5
7
4.0
8
id
Answer:
The 2nd one
Explanation: U answered yourself on the second one
Answer: I don't have the last column though.
Explanation:
What is toxicity? Give an example of something from your home.
Answer:
Toxicity is how much something can harm you, like poison. A quick example of this is rat poison. You can put it in traps to kill rats, but if you ingest it it'll also kill you. Also, tide pods are perhaps a more relevant example.
7. As the temperature of a fixed volume of a gas increases, the pressure will
Ovary inversely
O increase
O decrease
O not change
Answer:
increase
Explanation:
Please see the step by step explaination in the pictured attached below.
To build a sustainable multigenerational
civilization, it may be necessary to simulate
Earth's gravity. How will this be possible?
Simulating Earth's gravity in space would be challenging, but it is possible to create artificial gravity using centrifugal force. Centrifugal force is the outward force experienced by an object that is moving in a circle.
What is gravity?An unobservable force that draws things together. Anyone remains on the ground thanks to Earth's gravity, which also causes objects to fall.
One way to create artificial gravity in space is by building a rotating space station. The station would consist of two main parts: a central hub and a rotating section.
The hub would contain the crew quarters, life support systems, and other essential components, while the rotating section would be attached to the hub via a set of cables or other structures.
The rotating section would be set spinning, creating centrifugal force that would push the crew towards the outer rim of the section. This force would create a sensation of gravity that would be similar to that experienced on Earth.
Thus, by rotating a spacecraft, it is possible to create a centrifugal force that mimics the gravitational force of Earth.
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4. This metal (X) displaces copper from copper sulphate solution but does not
displace zinc from zinc sulphate. From this we can tell that the order of reactivity
(most reactive first) is
a. zinc; copper; X
b. zinc; X ; copper
c. copper ; X ; zinc
d. X; zinc; copper;
Answer:
Explanation:
B
PLEASE HELP!
The element (AI) is outlined in red on the periodic table.
Which period number is aluminum?
Which group number is aluminum in?
Answer:
period 3 and group 3
Explanation:
I'm saying group 3 because that is how I learnt it at school, but if you count it then it's in group 13.
What animals are in the Arctic Tundra?
Answer:
Polar Bears
Arctic Foxes
Seals
Penguins
They all live in the cold, so they all must live in the Arctic Tundra ;)
Answer:
Animals such as polar bears, arctic wolves, and arctic foxes live in the Arctic Tundra.
In the hydrolysis of ethyl ethanoate, what will happen when the reaction is catalysed by an alkali?
Answer:
That is exactly what happens when esters are hydrolysed by water or by dilute acids such as dilute hydrochloric acid. The alkaline hydrolysis of esters actually involves reaction with hydroxide ions, but the overall result is so similar that it is lumped together with the other two.
Explanation: