Answer:
You need two potassium atom to form an ionic bond with one sulfur atom. Pottassium ions are formed by donating losing their electrons in the outermost shell, thr lost electrons are gained by sulphur atom to form 2K+ and S2-, respectively. The attraction between the positive ions and negative ions gives rise to the ionic bond and the molecular formula is K2S
Explanation:
What mass of kcl is required to make 52 ml of a 0. 24 m kcl solution? report your answer to three places past the decimal point.
Answer:
Explanation:
La molaridad son los moles que hay por litro de solución.
En este caso tenemos 0,24 moles de KCL por 1000 ml de solución. El problema nos plantea que hay que preparar una solución de 54ml para poder sacar los moles hacemos una regla de tres.
1000 ml -----------0,24mol
54ml----------------X=(54ml*0,24mol)/1000ml
moles necesarios=0.0129 moles de KCl
Ahora para expresarlo en gramos utilizaremos la masa molar del compuesto, esto se hace buscando en la tabla periódica cada componente del compuesto y sumarlos.
En este caso tenemos el potasio (K) con una masa molar de 39 y el cloro (Cl) de 35,45 gramos lo
masa KCL=35,45+39=74,45 Gramos/mol
como tenemos 0.0129 moles haremos otra vez una regla de 3
1mol----------74,45 gramos
0.0129 mol-----0,960 gramos
espero que te sirva la respuesta! no te olvides de calificar :)
Mass can be calculated by using moles which can be further calculated from multiplication of Molarity to volume. The mass of KCl to make this solution is 0.960gram.
What is molarity?
Molarity can be calculated by dividing number of moles of solute by volume of solution in liter. Molarity is affected by temperature. Its unit is mole/litre. It measure the concentration of any solute in a solution.
Other concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution.
Mathematically,
Molarity= number of moles of solute/volume of solution in litre
Where,
moles= given weight ÷ molecular weight
= w/ 74.55
Substituting values in equation 1
0. 24=(w/ 74.55 )/(52/1000)
w=0.960gram
Thus the mass of KCl is 0.960gram.
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A 90.0 g sample of an unknown metal absorbed 25.6 J of heat as its temperature increased 1.18 degrees C. What is the specific heat of the metal
The specific heat of the metal is 241.05 J/kg°C
What is specific heat capacity?Specific heat capacity can be defined as the amount of heat required to raise a unit mass of metal through 1 °C
To calculate the specific heat capacity of the metal, we use the formula below.
Formula:
Q = cm(t'-t)............... Equation 1Where:
Q = Heat absorbed by the metalc = specific heat capacity of the metalm = mass of the metalΔt = increase in temperaturemake c the subject of the equation
c = Q/m(Δt)................. Equation 2From the question,
Given:
Q = 25.6 Jm = 90 g = 0.09 kgΔt = 1.18 °CSubstitute these values into equation 2
c = 25.6/(1.18×0.09)c = 241.05 J/kg°CHence, the specific heat capacity of the metal is 241.05 J/kg°C.
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PLEASE ANSWER 20 POINTS!!
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
glucose = C₆H₁₂O₆
glucose produced = 1/6 x 23.6 = 3.93 moles
How is a nonpolar covalent bond different than a normal covalent bond?
a. electrons are not shared
b. one of the atoms is an ion
c. electrons are shared, but they aren't shared evenly
Answer:
c. Electrons are shared, but they aren't shared evenly
Explanation:
Pure (non polar) bonds have a low electronegativity difference of 0.0 - 0.4 which allows electrons to be shared.
Polar bonds have a high electronegativity difference of 2.0 4.0 so rather than sharing the electrons, the electrons will be transferred to one atom only and will stay there.
Covalent bonds have a electronegativity difference between these two types of bonds (0.4 - 2.0) so electrons are shared but not equally, meaning they are shared between the two atoms but stay at one atom for a longer period of time than the other.
Flourine atom. Drag a valence electron from the left atom to the right atom. What happens?
4. What causes local winds to form?
Answer:
unequal heating and cooling of the landmass.
Answer:
Local winds are caused by unequal heating of Earth's surface within a small area. Local winds form only when large-scale winds are weak. A sea breeze is a local wind that blows from an ocean or a lake.
Substances known as fuels have energy stored as:
chemical energy
mechanical energy
electrical energy
kinetic energy
Answer:
Chemical energy
Explanation:
The energy stored in the bonds of atoms and molecules, is chemical energy .
Stay safe stay healthy and blessed.
Have a great day !
Thank you
Answer: Chemical energy. :]
Explanation:
Why is glass useful for making eyeglasses
Answer:
because it's the glass that goes on eyeglasses
Answer:
Because it is transparent
____________ rays show areas where large quantities of energy are released.
Answer:
Gamma
Explanation:
Answer:
Gamma
Explanation:
What do covalent bonds usually form at room temperature?.
Covalent bonds consist of pairs of electrons shared by two atoms, and bind the atoms in a fixed orientation.
How many moles are in 23 grams of CCl4?
Answer:
0.1494 moles
Explanation:
moles = mass/mm
mm of carbon tetrachloride is 154
so moles = 23÷154= 0.1494 moles.
Which of these reactions are redox reactions? Check all that apply. Cd HCl → CdCl2 H2 CuCl2 Na2S → 2NaCl CuS CaCO3 → CaO CO2 2ZnS 3O2 → 2ZnO 2SO2 CH4 2O2 → CO2 2H2O.
Cd + 2HCl → CdCl₂ + H₂, 2ZnS + 3O₂ → 2ZnO + 2SO₂ and CH₄ + 2O₂ → CO₂ + 2H₂O reactions are redox reaction.
What is redox reaction?Redox reactions are those reactions in which oxidation and reduction process takes place simultaneously.
Cd + 2HCl → CdCl₂ + H₂Above balanced equation is a redox reaction as in this reaction oxidation of Cadmium takes place from 0 to+2 state and reduction of hydrogen takes place from +1 to 0 state.
CuCl₂ + Na₂S → 2NaCl + CuSCaCO₃ → CaO + CO₂Above two balanced reaction are not the redox reaction as their is no oxidation or reduction takes place.
2ZnS + 3O₂ → 2ZnO + 2SO₂Above balanced equation is a redox reaction as in this reaction oxidation of sulfur takes place from -2 to+4 state and reduction of oxygen takes place from 0 to -2 state.
CH₄ + 2O₂ → CO₂ + 2H₂OAbove balanced equation is a redox reaction as in this reaction oxidation of carbon takes place from -4 to+4 state and reduction of oxygen takes place from 0 to -2 state.
Hence, Cd + 2HCl → CdCl₂ + H₂, 2ZnS + 3O₂ → 2ZnO + 2SO₂ and CH₄ + 2O₂ → CO₂ + 2H₂O reactions are redox reaction
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Answer:
1,4,5
Explanation:
3. Dialysis and osmosis can both be utilized in the health care system as purification methods. Describe the
differences between them and give an appropriate health care example of when each should be used.
Osmosis is involves movement of water molecules while dialysis involves movements of solutes.
Osmosis is applied detoxification while dialysis is applied in dialysis machines.
What is dialysis?What is dialysis is the process whereby certain molecules are able to pass through a semipermeable membrane.
Dialysis is employed in dialysis machines.
What is osmosis?Osmosis is the movement of water molecules across a semipermeable membrane from regions of low solute concentration to high solute concentration.
Osmosis is applied detoxification.
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Acetylene gas (CH2) is used as the fuel in welder's torches. This reaction is a combustion
reaction. You react 3.5 moles of acetylene with 5.5 moles of the other reagent and your target product is a gas with a MM of 44 g/mole.
Find the equation, Limiting reactant, excess, moles of target product produced and moles of excess reagent remaining.
This problem is pointing out acetylene gas undergoes combustion, so it asks for the equation, limiting reactant, excess, moles of target product and how much of the excess reactant is left.
Summary of answers:
- [tex]2CH_2+3O_2\rightarrow 2CO_2+2H_2O[/tex]
- Limiting reactant: acetylene.
- Excess reactant: oxygen.
- moles of target product produced: 3.5 moles.
- moles of excess reagent remaining: 0.25 moles.
Uses of stoichiometry:In chemistry, when two substances react to produce specific products, one can use the law of conservation of mass to correctly write the chemical equation standing for the chemical change. Thus, for acetylene, when it undergoes combustion, we would have:
[tex]2CH_2+3O_2\rightarrow 2CO_2+2H_2O[/tex]
In such a way, one can identify the limiting and excess reactants and the moles of target product, carbon dioxide whose molar mass is 44 g/mole, with the following calculations based on the mole ratios derived from the chemical equation:
[tex]3.5molCH_2*\frac{2molCO_2}{2molCH_2}=3.5molCO_2\\ \\5.5molO_2*\frac{2molCO_2}{3molO_2}=3.7molCO_2[/tex]
In such a way, we conclude that acetylene is the limiting reactant because it produces the lowest moles of CO2 and thus, oxygen is in excess. Moreover, the produced moles of the target product are 3.5 mol.
Finally, we can calculate the consumed oxygen with the following mole ratio and the leftover of oxygen (excess):
[tex]3.5molCH_2*\frac{3molO_2}{2molCH_2} =5.25molO_2[/tex]
[tex]mol _{O_2}^{left}=5.5mol-5.25mol=0.25mol[/tex]
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in this image of a volcano, which letter represents lava
Answer:
d
Explanation:
A weather balloon holds 2,000 cubic meters of helium. The density of helium is 0. 1765 kilograms per cubic meter. How many kilograms of helium does the balloon contain? Only enter a numerical value in the answer blank.
Answer:
353kg
Explanation:
2000 x 0.1765 = 353kg
for every 1 cubic metre of helium there is 0.1765 kg of it
the balloon is holding 2,000 cubic metres of the helium.
That means that there are 2000 times of 0.1765kg of helium in the balloon
so you times 0.1765kg by 2000
the current in the first circuit is 0.4 A. A second identical bulb is added in series. What will the current in the second circuit be?
pls answer quickly as possible i have an examination tomorrow so I am preparing for the tests
thanks
The current in the second circuit in series with the first circuit is 0.4 A.
Current in series circuit
The current flowing in series circuit is the same across all the component of the circuit.
The total voltage drop in a series circuit is given as;
V = IR₁ + IR₂ + IR₃
V = I(R₁ + R₂ + R₃)
If the current in first circuit is 0.4 A, when second identical bulb is added in series, the current in the second circuit will be 0.4 A.
Thus, the current in the second circuit in series with the first circuit is 0.4 A.
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If 25 ml of KBr is dissolved in 100 ml of water, what is the percent volume of the solution produced?
Answer:
4
Explanation:
You need divide 100/25 and that's it
How many moles of each element are in one mole of be(oh)2.
Answer:
How many moles of each element are in one mole of Be (OH)2? 1 mole of beryllium, 1 mole of oxygen, 2 moles of hydrogen 1 mole of beryllium, 2 moles of oxygen, 2 moles of hydrogen CORRECT ANSWER 2 moles of beryllium, 2 moles of oxygen, 2 moles of hydrogen
Explanation:
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 1 moles of beryllium, 2 moles of hydrogen and 2 moles of oxygen are in one mole of Be(OH)[tex]_2[/tex].
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically, the formula for mole is given as
number of moles of element=given mass of element÷ molar mass of element
1 moles of beryllium, 2 moles of hydrogen and 2 moles of oxygen are in one mole of Be(OH)[tex]_2[/tex].
Therefore, 1 moles of beryllium, 2 moles of hydrogen and 2 moles of oxygen are in one mole of Be(OH)[tex]_2[/tex].
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Which of the following would be a stable compound?
A.
NaS2
B.
MgF2
C.
KF3
D.
BeO2
Answer:
A...NaS2.............
ANSWER ASAP PLEASE THIS IS 50 POINTS
Answer:
6.47g
Explanation:
Hope this helps!
A gas in system has a constant pressure. the surroundings around the system lose 62 joules (J) of heat and does 474 joules of work onto the system. What is the internal energy of the system in calorie? (Calorie= 4.184 Conversion factor=1)
The internal energy of the system is 412 J.
First law of thermodynamicsFrom the first law of thermodynamics, energy can neither be created nor destroyed. Hence; U = q + w
U = internal energy
q = heat
w = work
Since work was done on the system q is positive. The system looses heat hence q is negative.
U = (-62J) + 474 J = 412 J
The internal energy of the system is 412 J.
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all the bases are not alkali why
Answer:
=》All bases are not alkali.
=》We use the term 'alkali' to refer to soluble bases / bases that are soluble in a liquid.
=》Since, only a few bases are soluble & the rest are not, we can't call all bases as alkalies.
=》Examples of alkalies: Lithium, Pottasium etc. They form strong bases.
Hope it helps ⚜
Which question could be answered using the process of scientific inquiry?
Do cute mice find food quicker than less cute mice?
O How do mice know that they have to find food?
O Do mice like soda?
O How does caffeine affect a mouse's ability to find food in a maze?
Answer:
1st one
Explanation:
If 2H2SO4 is part of a chemical equation, how many oxygens atoms from sulfuric acid are involved in the chemical equation
Answer: 8
Explanation: k*4O=2*4O=8O
How many moles are 3. 01 x 1022 atoms of magnesium?
Answer:
0.05 moles
Explanation:
There are about 6.02 * 10^23 atoms in a mole, so in the given sample, there are (3.01*10^22)/(6.02*10^23)=(1/2)(1/10)=0.05 moles.
Asap Help!!! I just wanted to know if my answer is correct i am not sure if its not please correct me
What is the name of the solid substance being produced from the chemical reaction between the two clear solutions above?
Answer:
Precipitate
Explanation:
A precipitate is a solid formed from a chemical solution
PRECIPITATE
Solid substance being produced from the chemical reaction between the two clear solution is termed as precipitate and the phenomenon is knowns as precipitation.
Precipation is an important part of chemistry practical in identifying the compounds, anions, cations and radicals.
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What volume would 2.25 moles of Ne gas occupy at STP?
Answer:
The volume would be 56 L of gas
Explanation:
Answer:
50.37L or 50.4L
Explanation;
= ( 22.4 dm³ × 2.25 moles ) ÷ 1 mole
= 50.4 dm³ 1dm³ = 1 L
Determine the mass percent of metal and its atomic mass.
Answer:
To calculate the mass percent of an element in a compound, we divide the mass of the element in 1 mole of the compound by the compound's molar mass and multiply the result by 100.
4. The reaction of solid copper (II) oxide with hydrogen gas to form copper metal and
liquid water.
Type:
5. Calcium hydroxide solution and carbon dioxide gas yields solid calcium carbonate and
liquid water.
Type:
6. Solid calcium carbonate and a solution of sodium chloride are made when aqueous
calcium chloride and a solution of sodium carbonate react together.
Type:
Answer:
Explanation:
4. Reduction reaction as Cu++ is reduced to Cu.
5. Double displacement reaction as the CO3-- replaces 2x OH-
6. Precipitation as two solutions combine to form a precipitate and a secondary product.
