Answer:
The air around you
Explanation:
Matter is defined as anything that has mass and occupy space. Matter may sometimes not be seen with naked eyes.
The decision we had to take on the answer is based on the fact that air has mass and does occupy space.
Air can be trapped in a container and its mass measured hence air is an example of matter.
Which of the following elements is the smallest?
Explanation:
where is options?????????????????
5. The energy diagram shown illustrates a reaction which is
an
A. exothermic reaction.
B. activated complex.
C. equilibrium reaction.
D. endothermic reaction.
Answer:
Explanation:
The answer is an exothermic reaction so A.
. De las siguientes soluciones:
1. 20 ml de alcohol etílico mezcladas con 80 ml de agua.
2. 500 ml de agua con 20 g de sal disueltas (V Sln: 500ml).
3. 80 g de sal en 2 litros de agua.
a) Identifica el soluto y solvente de cada solución y explica ¿por qué?
b) Encuentra la concentración por peso de la solución número 3 c) Entre la disolución 2 y 3 ¿Cuál presenta mayor concentración?
por favor lo necesito para hoy ¡gracias!
Answer:
can u translate this to English? I might be able to help
a) Solution 1: Solute is ethyl alcohol, solvent is water. Solution 2 and 3: Solute is salt, solvent is water.
b) Concentration by weight of solution 3: Approximately 3.85%.
c) Solution 3 has a higher concentration than solution 2.
a) Solutions and their solutes and solvents:
Solution 1: The solute is ethyl alcohol, and the solvent is water. This is because ethyl alcohol is the substance that dissolves in water to form the solution.
Solution 2: The solute is salt, and the solvent is water. Salt is the substance that dissolves in water to form the solution.
Solution 3: The solute is salt, and the solvent is water. Similar to solution 2, salt is the substance that dissolves in water to form the solution.
b) Weight concentration of solution number 3:
The weight concentration is calculated by dividing the mass of the solute (80 g of salt) by the total mass of the solution (80 g of salt + 2000 g of water):
Weight concentration = (80 g / 2080 g) * 100% ≈ 3.85%
c) Comparison of concentrations between solution 2 and 3:
Solution number 3 has a higher concentration than solution 2, as the weight concentration of solution 3 is approximately 3.85%, while the exact amount of water is not provided for solution 2 to calculate its concentration. However, solution 2 contains only 20 g of salt dissolved in 500 ml of water, which implies that the concentration will be lower than solution 3. Therefore, solution number 3 has a higher concentration compared to solution 2.
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How does a cirrus cloud look like
1) cotton
2) thin feather
Answer:
2) thin feather
Explanation:
Cirrus clouds are delicate, feathery clouds that are made mostly of ice crystals. Their wispy shape comes from wind currents which twist and spread the ice crystals into strands.
hope it helps :)
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Select the structure corresponding to trans-3-octene.
Answer: B
Explanation:
Answer:
The Correct Answer Is B.
Suppose that three isotopes of element X occur in nature as follows:
The relative atomic mass of the naturally occurring mixture of element X is
Answer:
107.5 amu
Explanation:
isotopes: fractional Wt Avg
isotopes: isotopic mass %Abundance abundance (amu)
X110 110 60 0.60 66.0
X105 105 30 0.30 31.5
X100 100 10 0.10 10.0
∑ atm mass contributions = 107.5 amu*
*amu = atomic mass units
Which of the following is an example of a solution?
A. An iron alloy
B. Iron metal
C. Iron rust
D. An iron ore
Answer:
A: an iron alloy.
Explanation:
Because iron alloy consists of minor components that are distributed within the major component, which is the basic requirement for a solution.
Butane (C4H10(9), AH = -125.6 kJ/mo) reacts with oxygen to produce carbon dioxide (CO2. AH+ = -393.5 kJ/mol) and
water (H20, AH+ = -241.82 kJ/mol) according to the equation below.
2C4H10(g) + 1302(g) → 8C02(g) + 10H2O(g)
What is the enthalpy of combustion (per mole) of C4H10(9)?
Use AH yen-(AHproducts) - ( He reactants)
-2,657.5 kJ/mol
0-5315.0 kJ/mol
--509.7 kJ/mol
O-254.8 kJ/mol
Answer:
ΔH = -5315kJ/mol
Explanation:
Based on Hess's law, ΔH of a reaction is defined as the sum of the ΔH of the products times their reaction coefficient - The sum of the ΔH of the reactants times their reaction coefficient.
For the reaction of the problem, ΔH is:
ΔH = 8ΔH CO2 + 10ΔH H2O - (2ΔH C4H10 - 13ΔH O2)
Where:
ΔH CO2 = -393.5kJ/mol
ΔH H2O = -241.82kJ/mol
ΔH C4H10 = -125.6kJ/mol
ΔH O2 = 0kJ/mol because O2(g) is the state of oxygen under STP.
Replacing:
ΔH = 8*(-393.5kJ/mol) + 10*(-241.82kJ/mol ) - (2*-125.6kJ/mol - 13*0kJ/mol)
ΔH = -5315kJ/mol
A mixture of reactants and products for the reaction shown below is at equilibrium in a 5.0 L container what would most likely happen to the equilibrium if the volume of the container will reduced to 3.0 L?
Since the volume decreased, it means that the pressure is going to rise. Thus, the equilibrium of the reaction will shift in the direction that has the least amount of moles.
The statement, that describes the equilibrium "will change in the direction with the minimum moles."
What is an equilibrium?A condition of equilibrium has become one of balance. Chemical equilibrium is the state in which both the reactants and products are present in concentrations that have no further tendency to change with time, resulting in no observable change in the system's properties.
When volume decreases, the equilibrium shifts to favor the direction that produces fewer moles of gas. When the volume is raised, the equilibrium shifts in favor of the direction that produces the most moles of gas. Because the container's volume will be lowered from 5.0 L to 3.0 L, the pressure will rise. As a result, the equilibrium of the reaction will shift in the direction with the fewest moles. When the volume is reduced, the pressure rises. This demonstrates that a gas's pressure is inversely proportional to its volume.
Hence the correct answer is equilibrium will change in the direction with the minimum moles.
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Describe weighted average
Answer:
Explained below
Explanation:
In simple average, we just add all the given data variables and divide it by the number of data given.
However, when it comes to weighted average, what we do is that we multiply each given variable by their weights and then divide the sum of that by the sum of the weights.
Thus, if the variables are denoted by x and their weights are denoted by y, then we have;
Weighted average = Σ(xy)/Σy
Plz Help I have One more time To retake and I can't fail it..
Answer:
B. Radar uses radio and the siren uses sound waves. both exhibit in the Doppler effect.
sorry if this is wrong
Re-word this statement: Ionic Radii are changing as you move down the column because the atoms in lower rows have more energy levels, which makes the valence electrons farther from the nucleus, so it takes less energy for them to be pulled away.
The Ionic radii are changing as you move across a row because each element has one more proton, which increases the attraction of the nucleus.
Answer:
ty po hehe
Explanation:
mark me as brainliest po thank you
High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to
purify chemical substances. The pressures used in this procedure range from around 500
kilopascals (500,000 Pa) to about 60,000 kPa (60,000,000 Pa). It is often convenient to know
the pressure in torr. If an HPLC procedure is running at a pressure of 3.20x10^8 Pa , what is its
running pressure in torr?
Express the pressure numerically in torr.
►
3.20 x 10^8 Pa = _____ torr
Answer:
2,400,000 torr (3 s.f.)
Explanation:
Convert the pressure from Pascal to atm first:
[tex]\boxed{1 \: atm = 101325 \:Pa }[/tex]
3.20 ×10⁸ Pa
= [(3.20 ×10⁸) ÷101325] atm
= 3158.2 atm (5 s.f.)
Convert atm to torr:
[tex]\boxed{1 \: atm = 760 \: torr}[/tex]
3158.2 atm
= (3158.2 ×760) torr
= 2400000 torr (3 s.f.)
please help with the attached picture question 21, 22, 23
Explanation:
21. The given molecule for cracking is tetradecane.
On cracking it forms one mole of decane (C10H22) and two moles of ethene gas.
The chemical equation is shown below:
[tex]C_1_4H_3_0->C_1_0H_2_2+2C_2H_4[/tex]
22. The essential condition for the formation of an ester is the reaction of alcohol and acid in presence of concentrated sulfuric acid.
Thus among the given options, the first option is the correct one.
23. Isomers of butanol are shown below:
It is 2-butanol.
The position of -OH group changes to the second carbon.
What is the difference between an exothermic and an endothermic reaction?
A. Endothermic reactions absorb heat.
B. Exothermic reactions absorb heat.
C. There are no changes in heat during either reaction.
D. Endothermic reactions release heat.
answer D
Explanation:hope thhis helped
which of the following is a physical change? 1.burning paper 2.grinding wheat 3.electrolysis of water 4.cooking rice
Answer:
2 grinding of wheat is just a physical change
plz brainlist
PLZ HELP Question 2 of 25 What is the total number of atoms in the molecule CzHg?
A. 2
B. 8
C. 11
D. 3
A. 2
One Cs (Caesium), the other one Hg (Mercury)
Note: we don't have Cz this might be Cs
Fe2O3 +3CO--2Fe+3CO2 .identify the substance oxidized ,reduced and oxidizing agent and reducing agent
Answer:
Oxidized : CO
Reduced: Fe
Oxidizing agent: Fe2O3
Reducing agent: CO
Explanation:
Loss of electrons is oxidation while gaining of electrons is reduction.
CO is a reducing agent, Fe2O3 is an oxidizing agent.
Each carbon atom is oxidized in CO. CO is the reducing agent
Each Fe atom in FeO3 is reduced. FeO3 is the oxidizing agent
Which of the following is not a pure form of a substance ?
A.Element
B.Atom
C.Molecule
D.Mixture
E.Compound
Answer:
Which of the following is not a pure form of a substance ?
C.mixture
Explanation:
since mixture is created due to one or more than two element,compound,molecule or atom.
Answer:
option D . mixture.
Explanation:
Mixture is not a pure form of a substance .
it is formed when two particles mixed together in one substance
Hope it is helpful to you ❣️✌️☺️☪️❣️
what do you mean by 1 joule work
Answer:
Joule is the SI unit of work. 1 Joule is amount of work done when a force of 1 Newton displaces a body through a distance of 1m in the direction of the force applied.
its not a question but i wanted to tell you guys that if you guyz like my answers then please don't forget to give like and follow at the same time. I am not forcing you to follow only if you guyz like my answer then like or follow. THANKS FOR READING..
Answer:
thank you for this oibnki
Answer:
Sure I'll go ahead and like your answers and follow you if that's what you wanted! :)
Explanation:
Please help me with my work
Answer:
2
Explanation:
There's 2 Hydrogen and Chlorine molecules on the right side with one Zinc. So the left side needs to have a coefficient of 2 on the hydrochloric acid, or HCl.
How many liters of carbon dioxide can be “scrubbed”, or removed, with 3.45 Liters of 0.10 M of lithium hydroxide solution?
Answer:
The correct answer is - 3.864 L of CO2.
Explanation:
mention two factors which affect pressure due to liquid contained in a vessel
Answer:
depth of the liquid and nature of liquid affects the pressure due to liquid contained in a vessel
Answer:
Two factors influence the pressure of fluids. They are the depth of the fluid and its density. A fluid exerts more pressure at greater depths
You work in the special effects department of a movie studio. You are currently working on a superhero movie where the hero is very strong and cannot be hurt by normal weapons such as a sword. In the next scene, the villain is going to hit the hero with a lead pipe. The hero's costume is mostly made of foam and carbon so that is it very light and easy to move around in but will crumble if hit with anything hard. For this scene, a section of the costume needs to be replaced with a different material that will only dent, not crumble, when hit with the pipe. You are on a deadline and look around the props department for ideas, what could you use?
Answer:
Aluminum or Galvanized iron
Explanation:
If the costume has to be such that the hero does not get hurt when hit by a lead rod and also is easy for the mobility then the suitable option for the costume could be Aluminum material which will only dent and not crumble.
Galvanized iron could be another choice being harder and stronger as compared to aluminum but a little heavy. It can sustain heavy impacts as compared to aluminum.
Answer:
You could use a shield if you are not speaking from a scientific way.
Balance the following equations by inserting the proper coefficients.
The question is incomplete, the complete question is;
Balance the following equations by inserting the proper coefficients.
CH4 + O2 ---------------> CO2 +H2O
CaCl2 + AgNO3 ----->Ca(NO3)2 +AgCl
C2H6O + O2----------->CO2 +H2O
Answer:
CH4 + 2O2 ---------------> CO2 +2H2O
2AgNO3 + CaCl2 → Ca(NO3)2 + 2AgCl
C2H6O + 3O2 → 2CO2 + 3H2O
Explanation:
You see, when we set out to balance chemical reaction equations, ultimately, our aim is to ensure that the number of atoms of each element on the reactant side is exactly the same as the number of atoms of the same element on the products side.
We do this by counting the number of atoms required to have a balanced reaction equation and then adding coefficients in order to have a balanced chemical reaction equation.
This is what have been done in balancing the three reaction equations shown in the answer section.
what is the name of the organic molecule
Explanation:
Although carbon is present in all organic compounds, other elements such as hydrogen ( H), oxygen ( O), nitrogen ( N), sulfur ( S) and phosphorus ( P) are also common in these molecules. An organic molecule is a molecule that contains carbon atoms (generally bonded to other carbon atoms as well as hydrogen atoms)
What happens to a glass of sugar solution when sugar is added to it?
The number of moles of water increases.
The number of moles of water decreases.
The molarity of the solution increases.
The molarity of the solution decreases.
When sugar is added to a glass of sugar solution, the molarity of the solution increases. Details about molarity can be found below, which is the third option.
What is molarity?Molarity is a term used to identify the amount of solute, in moles, dissolved in a solvent by volume. Molarity is expressed as moles per liter (mol/L).
However, molarity is directly proportional to the amount of solute in solution. This means that as the amount of solute increases, molarity also increases.
Therefore, when sugar is added to a glass of sugar solution, the molarity of the solution increases.
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the text of oxygen gas in the laboratory
Explanation:in testing for oxygen a glowing splint is used.
the glowing splint is brought in the presence of the test tube containing the gas
the glowing splint rekindles or lights up showing that oxygen is present.
this is a positive test because oxygen supports burning or combustion
What is the boiling point of water?
Answer:
212°F , 100°C , 373.15°K
They are all the same, in different units.
Answer:
The boiling point of water is 212 degrees fahrenheit, and/or 100 degrees celsius.
