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
Ms. Pitt set up a classroom demonstration to show what happens when a sample of zinc metal is add a.ed to a flask containing hydrochloric acid (HCl). The diagram shows what the students in the classroom observed during the demonstration. The students made two other observations: The flask felt warmer after adding the sample. The sample became smaller over time. Which of the following is NOT an evidence of a chemical reaction in this example.
A. Gas collected in the balloon
B.Temperature of sample is increased
c.Volume of HCl remains the same
D.Size of the zinc has become smaller
Answer:
volume of HCl remains the same
Reaction
Zn (s) + 2HCl (aq) ⇒ ZnCl₂ (s) + H₂ (g)
A. gas H₂ collected: true
B. Every chemical reaction produces or absorbs heat. In chemistry, this effect is described as the enthalpy of a reaction.
This reaction releases heat (exothermic) and causes the temperature to increase: true
C. the volume of HCl will decrease because it reacts: false
D. the size of the zinc metal decreases as it reacts: true
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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Which statement is true regarding the function of a catalyst in a chemical reaction?.
Answer:
You didn't give any options/statements, so I'm just going to give you context on what catalysts does. Catalysts decrease the activation energy needed, allowing more particles for successful reactions.
I know my colleague tried doing an experiment by using hydrogen peroxide as a catalyst and seeing how rates of reactions were affected. It ended up with a stain on our chemistry lab and him re-doing his entire lab.
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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How many moles of Neon atoms are in 224 liters of Neon gas under STP?
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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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.
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 ⚜
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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explain how magnesium bromide would be formed from atoms from magnesium and bromide
Answer: the resulting compound to be neutral, two bromine anions must combine with one magnesium cation to form magnesium bromide (MgBr2).
Explanation: Because the reaction between the two is
Bromine reacts with magnesium to form magnesium brom and
how is magnesium bromide formed? Magnesium bromide can be synthesized by reacting hydrobromic acid with magnesium oxide and crystallizing the product. It can also be made by reacting magnesium carbonate and hydrobromic acids, and collecting the solid left after evaporation.
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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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.
True or False: Dishwashing liquid cleans dirty plates because the nonpolar tail of the detergent dissolves the oily dirt particles while the polar head interacts with the polar water particles to allow the dirt to be washed away
Answer:
true
Explanation:
sorry if wrong I hope it right
Helpppp!!!!!!!!( ꈍᴗꈍ)
Which of the following is correct?
A real gas approcahes ideal gas behaviour at low pressure and high temperatureLiquification of a real gas is possible at low pressure and high temperatureThus, Option C is correct!!~
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.
____________ rays show areas where large quantities of energy are released.
Answer:
Gamma
Explanation:
Answer:
Gamma
Explanation:
At night, an equilibrium reaction between two different nitrogen compounds generates N2O5N2O5 in the atmosphere, as represented below.
Reaction 1: NO3(g)+NO2(g)⇄N2O5(g) K=2.6×10−11NO3(g)+NO2(g)⇄N2O5(g) K=2.6×10−11
During the day, solar radiation is absorbed by NO3(g), resulting in its decomposition. Which of the following best explains whether the equilibrium concentration of N2O5(g) in the atmosphere in the daytime is different from that in the nighttime, and why?
a) [N2O5] will be higher during the day, because the decomposition of NO3(g) results in an increase in the rate of production of N2O5(g).
b) [N2O5] will be higher during the day, because NO2(g) will be in excess, leading to an increase in the rate of production of N2O5(g)
c) [N2O5] will be higher at night, because the decomposition of NO3(g) in the daytime will result in an increase in the rate of consumption of N2O5(g) to reform NO3(g)
d) [N2O5] will be about the same at nighttime and daytime, because the amount of NO2(g) will not be changed and the equilibrium will not be affected.
The breakdown of NO3 in the day leads to more consumption of N2O5 in the day hence its concentration is greater at night than in the day.
What is equilibrium constant?The equilibrium constant is a number that shows how much reactants are converted to products in a reaction. It is often shown as capital letter K in English.
Given the situation described in the question, we know that the concentration of N205 will be higher at night, because the decomposition of NO3(g) in the daytime will result in an increase in the rate of consumption of N2O5(g) to reform NO3(g).
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Flourine atom. Drag a valence electron from the left atom to the right atom. What happens?
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.
ANSWER ASAP PLEASE THIS IS 50 POINTS
Answer:
6.47g
Explanation:
Hope this helps!
PLEASE ANSWER 20 POINTS!!
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
glucose = C₆H₁₂O₆
glucose produced = 1/6 x 23.6 = 3.93 moles
PLEASE ANSWER THIS ASAP!
An atom with the same number of protons but different number of neutrons is called an _______________________
the answer to your question is
isotope
Sodium, Mercury, Argon, and Neon are used in the production of lamps. There are fewer safety guidelines regarding the handling of Neon and Argon than there are for Mercury and Sodium. Which of the following best describes the elements within the group of the periodic table that contains Neon and Argon gas?
A) Solid at room temperature and mostly unreactive with strong acids.
B) Gaseous at room temperature and mostly unreactive with metals.
C) Solid at room temperature and mildly reactive with strong acids
D) Gaseous at room temperature and highly reactive with metals.
Answer:
Sodium, Mercury, Argon, and Neon are used in the production of lamps. There are fewer safety guidelines regarding the handling of Neon and Argon than there are for Mercury and Sodium. Which of the following best describes the elements within the group of the periodic table that contains Neon and Argon gas?
A) Solid at room temperature and mostly uncreative with strong acids.
B) Gaseous at room temperature and mostly unreactive with metals.
C ) Solid at room temperature and mildly reactive with strong acids.
D) Gaseous at room temperature and highly reactive with metals.
Explanation:
Answer: C.
I Hopes it helps
The best statement about the Neon and Argon gas is that they are gaseous at room temperature and mostly unreactive with metals.
What are stable atoms?The atoms which have complete octet in the outermost shell are known as stable atoms.
Neon and argon gases are the noble gases, as they have stable electronic configuration and shows non reactive nature with other elements. These are present in the gaseous state at room temperature.
Hence, option (B) is correct.
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in this image of a volcano, which letter represents lava
Answer:
d
Explanation:
NASA says 170,300 g of Oxygen (O2) per person is needed for a 6-month mission. Space X, a private company that partners with NASA claims the law does not apply in space and that only 127,500 grams of water are needed.
How many grams of water (H2O) is needed to meet the Oxygen demands? Use Stoichiometry to determine your answer.
The mass of water (H₂O) needed to meet the oxygen demand is 191587.5 g
Balanced equation2H₂ + O₂ —> 2H₂O
Molar mass of O₂ = 16 × 2 = 32 g/mol
Mass of O₂ from the balanced equation = 1 × 32 = 32 g
Molar mass of H₂O = (2×1) + 16 = 18 g/mol
Mass of H₂O from the balanced equation = 2 × 18 = 36 g
SUMMARY
From the balanced equation above,
32 g of O₂ reacted to produce 36 g of H₂O
How to determine the mass of water
From the balanced equation above,
32 g of O₂ reacted to produce 36 g of H₂O
170300 g of O₂ will react to produce = (170300 × 36) / 32 = 191587.5 g of H₂O
Thus, 191587.5 g of H₂O is needed to meet the oxygen demand
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What is the mass of 8 moles of Fe2O3?
Answer: 688 grams
Explanation:
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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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.
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:
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
