Answer:
4.63 moles of CCl4
Explanation:
C + 2Cl2 = CCl4
The balanced equation tells us that we'll obtain 1 mole of CCl4 for every 1 mole of C, assuming we have 2 or more moles of Cl2 (which we do in this problem).
Therefore, if we start with 4.63 moles of C, we'll produce 4.63 moles of CCl4
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
Find the odd one out and give a reason for your answer. knife, mirror, steel plate, spoon, stone.
Answer:
All are reflective except for stone
i guess it is stone
Explanation:
Hope it helps!!!
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Mirror is the odd one because it is the only thing used on a dressing table.All the other items like knife, steel plate, spoon, stone are used in kitchen for performing different activities like slicing, serving, tasting, breaking etc..Only mirror has no use in kitchen. Hence, it is the odd one!!~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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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 of these describes why a stent is used?
O A. To open an artery near the heart
O B. To repair a weak heart valve
O C. To increase the biocompatibility of a heart transplant
O D. To enhance the durability of a pacemaker
SUBMIT
Answer:the correct answer is A.To open an artery near the heart
Explanation:I just took the test :)
A stent is used to open an artery near the heart and the correct option is option A.
A stent is commonly used in medical procedures to open up narrowed or blocked arteries near the heart. It is a small, mesh-like tube typically made of metal or synthetic materials. The stent is inserted into the affected artery and expands, effectively widening the artery and improving blood flow. This procedure is known as coronary angioplasty or stenting.
The narrowing or blockage of arteries can occur due to atherosclerosis, a condition in which plaque builds up on the artery walls. This can lead to reduced blood flow and potentially result in chest pain (angina) or even a heart attack. By placing a stent, the artery is opened up, allowing for improved blood flow to the heart muscle.
Thus, the ideal selection is option A.
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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!!~
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
calculate the number of liters in a solution with a 1.5M and 50 moles
I don’t know what atoms are. What are atoms?
Which substances have Delta. Hf = 0 kJ/mol by definition? Select all that apply. O2(g) N(g) H2O(l) Br2(l) Fe(s) He(g) S6(s)
Answer:
O₂(g), Br₂(l) Fe(s), He(g)
Explanation:
Those elements that occur naturally in nature are the right answers because it took nothing to make them
Delta. Hf = 0 means no heat was lost or gained
standard enthalpy of formation is defined as the change in enthalpy when one mole of a substance in the standard state is formed from its pure elements under the same conditions
O₂(g): Yes, it is a pure element in the standard state.
N(g): No, the pure element in the standard state is N₂(g).
H₂O(l): No, it is not a pure element but a compound.
Br₂(l): Yes, it is a pure element in the standard state.
Fe(s): Yes, it is a pure element in the standard state.
He(g): Yes, it is a pure element in the standard state.
S₆(s): No, the pure element in the standard state is S₈(s, rhombic).
socraticorg
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How many moles of Neon atoms are in 224 liters of Neon gas under STP?
what is aerobic respiration and anaerobic respiration
Answer:
aerobic (which needs oxygen) and anaerobic (which doesn't need oxygen). Aerobic respiration is a fixed metabolic reaction that takes place in the presence of oxygen, going on in a cell to transform chemical energy into ATPs. Anaerobic respiration is a process of cellular respiration in which the excessive energy electron acceptor is neither oxygen nor pyruvate derivatives
hope this will help you ✨
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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2NaOH + H2SO4 --> Na2SO4 + 2H2O
How many moles of H2SO4 are needed to react with 4 moles of NaOH?
4 moles H2SO4
1 moles H2SO4
2 moles H2SO4
3 moles H2SO4
2moles of H₂SO₄ are needed to react with 4 moles of NaOH.
The number of moles present in a compound is the total number of atoms, ions or molecules present in that compound.
Number of moles of any substance
= mass of that substance/molar mass of the substance
1 mole of any substance contains 6.022 × 10²³ number of atoms, ions or molecules. 6.022 × 10²³ is also known as avogadro's number.
The mole ratio of NaOH:H₂SO₄ is 2: 1
Which means that 1mole of H₂SO₄ require 2 moles of NaOH.
Therefore 4 mole of NaOH will require: 4÷2=2 moles of H₂SO₄
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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.
ANSWER ASAP PLEASE THIS IS 50 POINTS
Answer:
6.47g
Explanation:
Hope this helps!
what is a spectorscope?
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Study of the absorption and emission of light and other radiation by matter, as related to the dependence of these processes on the wavelength of the radiation.
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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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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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A balloon filled with air has a volume of 4.24 liters at 23.00°C. If the balloon is cooled at constant pressure to 5.00°C, what is its new volume?
Answer:
The new volume if the balloon is cooled at constant pressure is 3.98 L
Explanation:
The new volume is calculated using the Charles law formula
that is V1/ T1 = V2/T2 where,
V1 = 4.24 l
T1= 23c into kelvin = 23 +273 =296 K
T2 = 5.00 c into kelvin = 5.00 + 273 = 278 K
V2 = ?
by making V2 subject the subject of the formula by multiplying both side by T2
V2 = V1 xT2/ T1
V2 = (4.24 L x 278 K) / 296 k = 3.98 L
A chemist wants a 0. 100 M solution of NaOH. She has 0. 0550 mol NaOH available. What volume of solution is needed to make the mixture?.
Answer:the answer is 0.0550L
Explanation:
How does solidification of alloys differ from solidification of pure metals?.
Answer:
Solidifications of alloys occurs over a range of temperatures whereas solidification of a pure metal will take place at a constant temperature
PLEASE ANSWER 20 POINTS!!
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
glucose = C₆H₁₂O₆
glucose produced = 1/6 x 23.6 = 3.93 moles
What is the mass of 8 moles of Fe2O3?
Answer: 688 grams
Explanation:
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
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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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
SOMEONE PLEASE HELP ME WILL MARK BRAINLIEST PLEASE!!
moles of oxygen: 1/2 x moles of water
= 1/2 x 7.8 = 3.9
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.
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.
