Answer:
the number of gas molecules in the sample
12. Which formula shows a substance that is not molecular?
H₂
H2O
н
CO2
Answer:
the answer is H ..............
4-chloroaniline, benzoic acid and 1,4-dibromobenzene. Prepare a flow chart to illustrate the process of separation for each component.
Answer:
The flow chart is found in the attachment
Explanation:
The mixture of 4-chloroaniline, benzoic acid and 1,4-dibromobenzene is separated based on their different solubility properties.
4-nitroaniline is basic and is first extracted using an acid, hydrochloric acid.
Benzoic acid is an acid, hence is extracted using a base, using either sodium hydrogen carbonate or sodium hydroxide.
1,4-dibromobenzene is neutral and is extracted from an organic solvent by evaporation using its property of solubility in an organic solvent.
In the flow chart illustrating the separation process, first the mixture of organic compounds is dissolved in ether, an organic solvent and then placed in a s eparatory funnel.
Then, the basic amine compound, 4-chloroaniline is removed from the organic layer into an aqueous layer by adding an inorganic acid, HCl. The aqueous lower layer is drained into a conical flask. The 4-chloroaniline is then precipitated out of solution by adding concentrated NaOH dropwise.
The organic acidic, benzoic acid is then extracted from the organic layer by adding an inorganic base, sodium hydrogen carbonate. The lower aqueous layer is drained into another flask. Benzoic acid is then precipitated out of solution by adding a concentrated solution of HCL.
The neutral 1,4-dibromobenzene is then obtained by evaporation of the organic solvent
140 g of KCl is dissolved in 600 mL of water. What is the molarity?
Answer:
[tex]\boxed {\boxed {\sf molarity \approx 3 \ M \ KCl}}[/tex]
Explanation:
Molarity is a measure of concentration in moles per liter. The formula is:
[tex]molarity= \frac{moles \ of \ solute}{liters \ of \ solution}[/tex]
We are given grams of solute and liters of solution, so we must convert both before calculating molarity.
1. Convert Grams to MolesWe convert grams to moles using the molar mass. This value is found on the Periodic Table. It is the same as the atomic mass, but the units are grams per mole (g/mol) instead of atomic mass units (amu).
We have the compound KCl, so we look up the molar masses of the individual elements.
Potassium (K): 39.098 g/mol Chlorine (Cl): 35.45 g/molThe compound does not contain subscripts, so we can add the molar masses together to find the molar mass of the compound.
Potassium chloride (KCl): 39.098+ 35.45= 74.548 g/molUse the molar mass as a ratio.
[tex]\frac {74.548 \ g\ KCl}{1 \ mol \ KCl}[/tex]
Multiply by 140 grams of KCl.
[tex]140 \ g\ KCl*\frac {74.548 \ g\ KCl}{1 \ mol \ KCl}[/tex]
Flip the ratio so the units of grams of KCl cancel.
[tex]140 \ g\ KCl*\frac{1 \ mol \ KCl} {74.548 \ g\ KCl}[/tex]
[tex]140 *\frac{1 \ mol \ KCl} {74.548 }[/tex]
[tex]1.877984654 \ mol \ KCl[/tex]
2. Convert Milliliters to Liters1 liter contains 1000 milliliters. Create another ratio.
[tex]\frac{ 1 \ L}{1000 \ mL}[/tex]
Multiply by 600 milliliters (the value we are converting).
[tex]600 \ mL *\frac{ 1 \ L}{1000 \ mL}[/tex]
The units of milliliters cancel.
[tex]600 \ *\frac{ 1 \ L}{1000 }[/tex]
[tex]0.6 \ L[/tex]
3. Calculate MolarityNow we know the moles of solute and the liters of solution.
1.877984654 mol KCl and 0.6 LSubstitute the values into the molarity formula.
[tex]molarity= \frac {1.877984654 \ mol \ KCl}{0.6 \ L}[/tex]
[tex]molarity= 3.129974424 \ mol \ KCl/L[/tex]
The original measurements of grams and milliliters have 2 and 1 significant figures. We must round our answer to the least number of sig figs: 1.
For the number we found, that is the ones place. The 1 in the tenths place tells us to leave the 3 in the ones place.
[tex]molarity \approx 3 \ mol \ KCl/L[/tex]
1 mole per liter is equal to 1 molar or M. Convert the units.
[tex]molarity \approx 3 \ M \ KCl[/tex]
The molarity is approximately 3 M KCl.
which of the following is true about the action-reaction forces encountered in Newton’s third law
A. always cancel each other out
B always act on different objects
C are always the same as normal and frictional forces
D None of the above
Explanation:
D)None of the above!!!!
B: Always act on different objects
what is thermodynamics ???
don't explain .-. !!!
Answer:
the scientific study of the relations between heat and other forms of energy
4. Complete the following equations:
CuCl2 + Na2CO3 → 2 NaCl +............
FeSO4 + BaCl2 →
Cu(NO3)2 + CaCO3
Answer:
2NaCl + CuCO3
FeCl2 + BaSO4
CuCO3 + Ca(NO3)2
Explanation:
Presumably this is a double replacement reaction.
A+B + C+D → A+D + C+B
It seems I may be wrong so please try to work out the problem yourself to double check, keeping in mind the charges of each compound.
Which of the following is not a polymer
A. Glucose.
B. Starch.
C. Cellulose.
D. DNA.
Answer:
A. Glucose
Explanation:
Glucose is a monomer and not a polymer. So, option (A) is not a polymer.
Glucose is not a polymer because it is a kind of molecule while Starch , cellulose and DNA are polymers.
The correct answer is option A. Glucose.
*Asap*
a) what is the rate equation?
b) what are the units of the rate constant?
c) what would happen to rate if the temperature was increased?
Answer:
(a).
[tex]order \: of \: A = 2 \\ order \: of \:B = 0 \\ rate = k[A] {}^{2} [B][/tex]
(b)
[tex]0.32 \times {10}^{ - 3} = k {(0.12)}^{2} (0.15) \\ k = 0.148 \: {mol}^{ - 2} {dm}^{6} {s}^{ - 1} [/tex]
(c). The rate increases because kinetic energy of reactant molecules increases.
Atoms are found to move from one lattice position to another at the rate of 300,000 jumps/s at 500 0C when the activation energy for their movement is 10,000 cal/mol. Calculate the jump rate at 400 0C.
Answer:
1
Explanation:
1
The specific heat capacity of liquid ethanol is 2.42 J/gºC.
How many joules of heat must be absorbed by 0.463 g ethanol to change its temperature from 51.6 °C to 82.4 °C?
Show work to receive credit.
Atoms are neutral because the number of
Answer:
electrons and protons
Explanation:
Literally search it up
Is benzene a solute or solvent
12. NAD and NADPH are distinguished from each other by the
that's bonded to the sugar ring attached to the adenine.
O A. phosphate group
O B. adenine
O C. carbon dioxide
O D. nicotinamide
Answer:
A. phosphate group
Explanation:
I got it right in class!
Hope this Helps!! :))
Which rock type is most likely to compsoed of just one mineral?
rock salt
conglomerate
basalt
rhyolite
maybe is answer is rhyolite
Answer:
the answer is rhyolite.
Explanation:
i'm pretty sure it is my guy
Some objects can store more thermal energy than others.
A. True
b. False
Answer:
A. True
Explanation:
What is another name for North East trade winds?
Answer:
Because winds are named for the direction from which the wind is blowing, .Explanation: the winds are called the northeasterly trade winds in the Northern Hemisphere and the southeasterly trade winds in the Southern Hemisphere.
Ketone bodies are produced when a person what
Answer:
Ketones and ketoacids are alternative fuels for the body that are made when glucose is in short supply. They are made in the liver from the breakdown of fats. Ketones are formed when there is not enough sugar or glucose to supply the body's fuel needs. This occurs overnight, and during dieting or fasting.
Explanation:
What volume would 0.853 moles of Nitrogen gas occupy at STP?
Answer:
19.12 L
Explanation:
At STP(i.e. Standard temperature and pressure).
The volume occupied by one mole of gas = 22.4 L
The pressure = 1 atm
The temperature = 273 K
Thus, since 1 mole of gas = 22.4 L;
Then 0.853 moles of N2 gas will occupy:
= (0.853 moles of N2 gas × 22.4 L)/ 1 mole of N2 gas
= 19.12 L
Avagadro’s number:
A: Is constant irrespective of mass of the gases
B: Varies according to the mass of the gases
C: Varies according to the pressure on the gases
D: All of the Above
Answer:
A: Is constant irrespective of mass of the gases
Explanation:
Avagadro's number, denoted by nA, is a number that represents the units in one mole of any substance. The number is 6.02214076 × 10²³ and the units can be atoms, molecules, ions, formula units etc.
That is;
1 mole of a substance = 6.022 × 10²³atoms, molecules, ions, electrons etc.
It is important to note that the Avagyadro's number is constant irrespective of mass of the gases that are involved.
A substance with two oxygen atoms is combined with a substance with one oxygen atom to form one product. What is true of the product?
There will be no oxygen in the product. Some of the oxygen will evaporate into the air.
Please help me ASAP
Which of the following pairs of atoms is most likely to form an ionic bond?
lithium and sodium
sodium and neon
sulfur and oxygen
lithium and sulfur
Answer:
lithium and sulfur
Explanation:
An ionic bond is formed between a metal, which loses electrons to form a cation, and a non-metal, which gains electrons to form an anion.
Which of the following pairs of atoms is most likely to form an ionic bond?
lithium and sodium. NO. Both are metals. sodium and neon. NO. Sodium is metal and neon is a noble gas. sulfur and oxygen. NO. Both are non-metals. lithium and sulfur. YES. Lithium is metal and sulfur non-metal.why is an alkaline substance dropped into lakes in some countries
Answer:
Lake Treatment
Explanation:
Sulphuric dioxide produced by industries and released into the atmosphere returns as acid rain or sulphuric acid. In lakes impacted by acid rain, such as in Ontario, Canada, the application of alkalis dropped by airplanes can control and neutralize the water's pH level.
At a fixed volume, a four-fold increase in the temperature of a gas will lead to _______ in pressure.
Question 2 options:
A)
no change
B)
a two-fold decrease
C)
a four-fold decrease
D)
a four-fold increase
Answer:
D) a four-fold increase
Explanation:
According to Gay-Lussac's law, which states that the pressure of a given amount of gas is directly proportional to the temperature at a constant volume, the pressure increases with an increase in temperature.
According to this question, at a fixed volume, a four-fold increase in the temperature of a gas will lead to a four-fold increase in the pressure as well.
A physical change :_______
a) occurs when water is evaporated.
b) occurs when glucose is converted into energy within your cells.
c) occurs when sugar is heated into caramel
d) occurs when iron rusts.
Of course, most of us know the reaction between Coca Cola and Mentos. So please can someone provide a chemical equation which contains the ingredients in Coca Cola and Mentos that will make it to foam?
Answer:
As the Mentos candy sinks in the bottle, the candy causes the production of more and more carbon dioxide bubbles, and the rising bubbles react with carbon dioxide that is still dissolved in the soda to cause more carbon dioxide to be freed and create even more bubbles, resulting in the eruption
1. You find a separatory funnel set up in a fume hood. There are clearly two visible layers. Describe a method you could use to determine which layer is the aqueous layer.
Answer:
You find a separatory funnel set up in a fume hood. There are clearly two visible layers. Describe a method you could use to determine which layer is the aqueous layer.
Explanation:
In the separating funnel, the liquid with less density exists at the top layer and the liquid with greater density will exist at the bottom layer.
To identify the aqueous layer, add a bit of water to the separating funnel.
Then, observe where the water will go and mix.
If it mixes with the bottom layer, then the bottom layer is the aqueous layer.
If water mixes with the top layer, then top layer is the aqueous layer.
A method we could use to determine which layer is the aqueous layer is by adding 2-4 drops of water in the separatory funnel.
Explanation:
A separatory funnel is a glass apparatus used in labs to separate two immiscible liquids from each other.The two liquids will be present distinctly in form of two different layers one on the other.The liquid at the bottom is with higher density in comparison to the liquid layer at the top which is with lower density.It is mainly used to separate the layer of organic compounds from the aqueous layer.One way to determine the aqueous layer in the separatory funnel is to add 2-4 drops of water to the separatory funnel and observe in which layer the water drops get invisible that is mixed up.The layer in which water drop mixes will experience a small increase in its volume and that will be the aqueous layer.Water drops will not mix with the organic layer can be easily observed with eyes.So, from this, we can conclude that a method we could use to determine which layer is the aqueous layer is by adding 2-4 drops of water in the separatory funnel.
Learn more about separatory funnel here;
brainly.com/question/5536204?referrer=searchResults
brainly.com/question/5999552?referrer=searchResults
Please answer .
Which answer choice is correct ?
There are four options.
Answer:
I also think NaOH is the answer since they are all strong electrolytes and NaOH has the highest number
Match the following parts of an atom to their description.
Neutron
?
Negatively charged
particle that moves
around the nucleus
Nucleus
?
Positively charged particle
in the nucleus
Electron
2
Noncharged particle in the
nucleus
Proton
?
Composed of protons and
neutrons
Answer:
Neutron - non charged particle in nucleus
nucleus - composed of proton and Neutron
electron - negatively charged particle that moves around the nucleus
proton - positively charged particle in the nucleus.
Explanation:
these the are definitions of the terms
please answer this chemistry question
Answer:
Answer will be A
Explanation:
PLS MARK BRAINLIEST
50.0 g of Potassium chloride reacts with 50.0 g of oxygen to produce KCIO3. After writing
and balancing the reaction, determine the amount of potassium chlorate produced
128 g
32.0 g
082.2 g
None of these answers.
Explanation:
If 50.0 grams of Zinc are reacted with 50.0 grams of Hydrogen Chloride ... 50.09 Zn x 1 mol Zn , Imol ZnCl2 , 136.4g. ... If a decomposition reaction produces a 75.0% yield for the oxygen by mass (128.0 grams were.