Whats the question??????????????????/
What is the molarity of a solution that is made with 3 moles of Na and 2 L of water
Answer - 1.50 M Na
Explanation -
3.00 moles of Na over 2.00 L of water.
3.00/2.00 = 1.50 M Na
I cannot be entirely sure. But it's an educated guess.
names the process which takes place when a red litmus paper turns white when dropped into chlorine water
Answer:
Chlorine gas bleaches the damp litmus (red or blue). Bleaching is an oxidation process.
Explanation:
Answer:
Chlorine gas bleaches the damp litmus (red or blue). Bleaching is an oxidation process. If you are considering the colour change only - refer to it as bleaching. If you are considering the reaction mechanism and how the chemicals which provide the colour are changed, then refer to it as oxidation.
Explanation:
Which of the following best describes the crest of a transverse wave?
а. length
b. high point
c. speed
d. low point
Answer:
B
Explanation:
Which of the following molecules is classified as a carbohydrate?
Answer:
I think it's Glycogen.....
A student observes that a ray of light bends where it passes from glass into water. What best explains this phenomenon? O The properties of a wave change as it travels from one medium into another. O The energy of a liquid is greater than that of a solid and increases the amount of light in it. O The mass of a ray of light varies in proportion with the density of its surroundings. O A wave consumes energy in a solid but produces energy in a liquid.
Answer:
The correct answer is - The properties of a wave change as it travels from one medium into another.
Explanation:
The bending of the light from passing through the air into the liquid is called the refraction of the light due to change its direction as it slows down as water is more denser than air with a higher refractive index. They slow and the wavelength decreases but frequency remain same
EVALUATE
1. How many moles are in 3g of N atoms?
2. How many grams are in 4 moles K?
Answer:
1. 0.214moles
2. 156g
Explanation:
1. Mole = Mass ÷ molar mass
Molar mass of N = 14g/lol
mole = 3/14
mole of N = 0.214mol
2. mole = mass ÷ molar mass
Molar mass of K = 39g/mol
4 = mass/39
mass = 39 × 4
mass = 156g.
Mr. Ragusa asks Hassan to make silver crystals from the following reaction.
2AgNO3 + Cu --> Cu(NO3)2 + 2Ag
Mr. Ragusa gives Hassan 51 g of silver nitrate to conduct the experiment. Hassan gives Mr. Ragusa 20 g of
silver crystals. What was Hassan's percent yield for his experiment?
Please round your answer to 2 decimal places
Answer:
Percentage yield = 61.7%
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated:
2AgNO₃ + Cu —> Cu(NO₃)₂ + 2Ag
Next, we shall determine the mass of AgNO₃ that reacted and the mass of Ag produced from the balanced equation. This is illustrated below:
Molar mass of AgNO₃ = 108 + 14 + (16×3)
= 108 + 14 + 48
= 170 g/mol
Mass of AgNO₃ from the balanced equation = 2 × 170 = 340 g
Molar mass of Ag = 108 g/mol
Mass of Ag from the balanced equation = 2 × 108 = 216 g
SUMMARY:
From the balanced equation above,
340 g of AgNO₃ reacted to produce 216 g of Ag.
Next, we shall determine the theoretical yield of Ag. This can be obtained as follow:
From the balanced equation above,
340 g of AgNO₃ reacted to produce 216 g of Ag.
Therefore, 51 g of AgNO₃ will react to produce = (51 × 216)/340 = 32.4 g of Ag.
Thus, the theoretical yield of Ag is 32.4 g.
Finally, we shall determine the percentage yield of Ag. This can be obtained as follow:
Actual yield = 20 g
Theoretical yield = 32.4 g
Percentage yield =?
Percentage yield = Actual yield /Theoretical yield × 100
Percentage yield = 20 / 32.4 × 100
Percentage yield = 61.7%
Plzzz someone help me last question
Answer:
D -35 West
if this is correct plz mark me brainliest because this is my first question
In atoms, electrons surround the nucleus in what?
Orbitals
Explanation:
Electrons are found in different levels or orbitals surrounding the nucleus. The electrons can be found at any point in their orbital.
Hope this helped!!!
Answer:
shells or orbitalsthat
Explanation:
An aqueous solution was made by dissolving 0.543 g of an unknown, monoprotic acid into 25.00 mL of water in an Erlenmeyer flask. After an acid/base indicator was added, 41.21 mL of 0.150 M NaOH was used to reach the end point.
a)Find the molar mass of the acid.
b)Determine the identity of the acid based on the following data:
PLEASE HELP ME
Answer:
a. 87.8g/mol is the molar mass of the acid.
b. The answer is in the explanation.
Explanation:
To solve this question we must find the moles of the monoprotic acid using the reaction with NaOH (1mole of monoprotic acid reacts with 1 mole of NaOH). With the moles and the mass of the unknown we can find the molar mass.
Moles of NaOH added:
0.04121L * (0.150moles / L) = 6.1815x10⁻³ moles NaOH = Moles monoprotic acid
Molar mass is:
0.543g / 6.1815x10⁻³ moles = 87.8g/mol is the molar mass of the acid
b. I can't see the image you are giving because has a low resolution. But the identity of the acid can be obtained because the acid:
Has the same molar mass.
Is a monoprotic acid.
(a) The molecular mass of the unknown monoprotic acid will be 87.84 g/moles.
(b) The acid can be butyric acid, as it is a monoprotic and have mass near about 87.84 g/mol.
(a) The endpoint by the addition of NaOH has been reached when the monoprotic acid has been completely utilized. Since the NaOH has been monobasic. The moles of NaOH will be equal to the moles of acid.
Moles of NaOH = moles of acid
The molarity of NaOH = 0.15 M
Volume of NaOH = 41.21 ml
Molarity = [tex]\rm \dfrac{moles}{volume\;(L)}[/tex]
Moles = molarity [tex]\times[/tex] volume (L)
Moles of NaOH = 0.15 [tex]\times[/tex] 0.04121 L
Moles of NaOH = 0.00618 moles
Moles of NaOH = moles of acid
moles of acid = 0.00618 moles.
Mass of acid dissolved = 0.543 grams
Molecular weight of acid = [tex]\rm \dfrac{weight}{moles}[/tex]
Molecular weight of acid = [tex]\rm \dfrac{0.543}{0.006815}[/tex]
Molecular weight of acid = 87.84 g/moles.
(b) The acid with the molecular mass of 87.84 g/mol with being the monoprotic acid can be butyric acid. The butyric acid has a molecular weight of 88 g/mol.
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How can you find density mathematically ?
Answer:
d=m/v
Explanation:
density equals mass over volume. you take your mass and put it in the numerator and your volume in the denominator. You then divide the numbers and round to the nearest tenth or hundredth.
Which of the following polyatomic ions will form an ionic compound with a single sodium ion?
CO3 2-
HCO3 1-
SO4 2-
SO3 2-
Answer:
Option B, HCO3 1-
Explanation:
The valence of Sodium ion is +1 and the valence of HCO3 is -1. Thus, sodium ion has an extra electron to be donated to complete its outer shell while HCO3 needs an electron to complete its outer shell
Hence Na will combine with HCO3 to form NaHCO3
Option B is correct
The polyatomic ion which will form an ionic compound with a single sodium ion is; HCO3 ¹-
In chemical bonding between ions;
The major criteria is a balance of charges within the compound formed.
As such, all polyatomic ions in the option are di-ionic except for HCO3 1- which can perfectly form an ionic compound with 1 single sodium ion.
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How do you define nitrogen?
Answer:
nitrogen is a gas
Explanation:
nitrogen is a gas which consists of diatomic molecules and about 78%of it occupies the atmosphere
Which statement is true for nuclear reactions but not for chemical reactions?
O A. The total number of atoms stays the same throughout the
reaction.
B. The nuclei of the atoms are changed by the reaction.
C. The total mass of the products is the same as the total mass of
the reactants.
D. The nuclei of the atoms stay the same throughout the reaction.
Answer: B. The nuclei of the atoms are changed by the reaction.
Explanation:
The statement which is true for nuclear reactions but not for chemical reactions is that the nuclei of the atoms are changed by the reaction.
There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus or nuclei respectively.
In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.
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Which of the following terms describes a transfer of energy?
a. internal energy
b. heat
c. temperature
d. kinetic energy
The term that best describes the process of transfer of energy is known as heat. Thus, the correct option for this question is B.
What is the transfer of energy?The process of transfer of energy is known as conduction. It occurs when a significant amount of energy can be transferred or migrated between two or more objects in a closed system where the term heat involves the transfer of thermal energy.
Heat represents the process of transfer of energy from one source to another in a thermodynamic system. It significantly involves the mechanism that constitutes other thermodynamic work in order to reveal the transfer of energy into matter.
Therefore, heat is the term that best describes the process of transfer of energy. Thus, the correct option for this question is B.
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Ammonia is produced by the Haber process. The equation is shown.
N2 (g) + 3H2 (g) ⇔ 2NH3 (g)
The forward reaction is exothermic.
Which statement is correct?
Increasing pressure decreases the yield of ammonia, but speeds up the reaction.
Increasing temperature decreases the yield of ammonia, but speeds up the reaction.
Increasing the concentration of hydrogen and nitrogen results in a lower yield of ammonia.
Increasing the temperature increases the yield of ammonia and speeds up the reaction.
Answer:
option D
Explanation:
Increasing the temperature increases the yield of ammonia and speeds up the reaction as chemical reaction is affected by temperature.
Answer:
increasing the temperature decreases the yield of ammonia but speeds up the reaction
Explanation:
first pressure have no effect in chemical reaction
V. Concentration Cell
Copper - Copper
Cy(s), CuCl2 (0.01) || Cu(s), CuCl2 (1.0 M)
1. Draw the schematic of the electrochemical cell that includes all the components (metals, solutions, salt bridges, voltmeters, etc.). Annotate on the schematic which side is the anode, which side is the cathode, the sign of each half cell, the composition of the metals and solutions, and the direction of the flow of the electrons through the cell.
2. Write the half reactions that occur at the anode and cathode in this electrochemical cell. Annotate which half reaction occurs at the anode and the cathode.
3. Write the overall balance reaction of this electrochemical cell.
4. Calculate E°cell of this electrochemical cell. (include units)
E°cell __________________________
5. Calculate the reaction quotient (Q) of this reaction.
Q ______________________
6. Calculate the expected Ecell for this reaction.
Ecell ______________________
Answer:
Nothing
Explanation:
Do it yourself. Kid
The Law of Conservation of Matter states that in a chemical reaction matter cannot be ___ or ____
Answer:
The law of conservation of matter states that in a chemical reaction matter cannot be created or destroyed
Explanation:
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Why is the number of hours of daylight different in the summer for two regions located at different latitudes in the Northern Hemisphere?
Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the differences in the path of the Sun and in sunrise and sunset times are due to the Earth's orbit on its axis and the Earth's curvature.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.
Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.
So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. The differences in the path of the Sun and in sunrise and sunset times are due to the Earth's orbit on its axis and the Earth's curvature.
Therefore, the differences in the path of the Sun and in sunrise and sunset times are due to the Earth's orbit on its axis and the Earth's curvature.
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Which molecule is used as a primary energy source by our bodies?
Calculate the molar mass of ZnCr04
Answer:
181.403 g/mol is the answer as it is Zinc chromate
Explanation:
Answer:
181.403 g/mol
Explanation:
Molar mass of ZnCrO4 = 181.3737 g/mol. This compound is also known as Zinc Chromate. Convert grams ZnCrO4 to moles or moles ZnCrO4 to grams. 65.38 + 51.9961 + 15.9994*4
Which of the following statements is a true statement regarding a solution with [H1+] =1x10-5 M and [OH1-]= 1x10-9 M?
A. The [H1+] > [OH1-] and the solution is basic
B. The [H1+] >[OH1-] and the solution is acidic
C. The [OH1-] > [H1+] and the solution is basic
D. The [OH1-] > [H1+] and the solution is acidic
Answer:
B. The [H1+] >[OH1-] and the solution is acidic
Consider these two entries from a fictional table of standard reduction potentials.
X3++3e−⟶X(s)o=−1.95 V
Y3++3e−⟶Y(s)o=−0.19 V
What is the standard potential of a galvanic (voltaic) cell where X is the anode and Y is the cathode?
Answer:
+1.76 V
Explanation:
Ecell = Ecathode - Eanode
= -0.19 - (-1.95) = + 1.76 V
The standard potential of a galvanic (voltaic) cell is +1.76 V
How do we calculate the standard electrode potential?Standard electrode potential of galvanic (voltaic) cell will be calculated by using the following equation as:
Ecell = Ecathode - Eanode
Given that, electrode potential of cathode = -0.19 V
Electrode potential of anode = -1.95 V
On putting values in the above equation, we get
Ecell = -0.19 - (-1.95) = +1.76 V
Hence the resultant electrode potential is 1.76V.
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What is the molarity of a solution in which 0.257 moles of HNO2 is dissolved in 490ml of water?
0.52 molar is the molarity of a solution in which 0.257 moles of HNO2 is dissolved in 490ml of water.
What do you mean by the term molarity ?The term molarity is defined as the number of moles of solutes are dissolved in per litre of solution. It is represented by the symbol "M". The unit of molarity is molar(M).
To calculate the molarity of a solution, divide the moles of solute by the volume of the solution expressed in liters.
The formula of molarity = a number of moles of solutes / litre of solution
Given:
Number of moles = 0.257 moles
Volume = 490ml = 0.49 litre
Molarity = ?
According to the definition of molarity,
Molarity = Number of moles of solute / litre of solution
Molarity = 0.257 moles / 0.49 litre
Molarity = 0.52 molar
Thus, the molarity of a solution in which 0.257 moles of HNO2 is dissolved in 490ml of water is 0.52 molar.
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Which statements comparing the Sun and a red supergiant are true? Select the two correct answers.(1 point)
The Sun and a red supergiant have similar luminosity.
The Sun and a red supergiant are of similar size.
The Sun's temperature is higher than that of a red supergiant.
The Sun will outlive a red supergiant.
Answer:
The sun will outlive the red supergiant and The Sun's temperature is higher than that of a red supergiant.
Explanation:
Just took the quiz
Unit: Stoichiometry
"Multi-Step Problems" â WS #3
Directions: Use dimensional analysis to perform the following calculations. Be sure to show all of your work, include your units, and round your answers to the correct number of significant figures. How many formula units of sodium nitrate will react with 20.0 g of calcium carbonate to product sodium carbonate and calcium nitrate according to the following reaction?
2 Na(NO3) + Ca(CO3) Ã Na2(CO3) + Ca(NO3)2
What volume of oxygen is produced at STP when 6.58 x 1024 molecules of water is decomposed according to the following reaction? 2 H2O Ã 2 H2 + O2
How many liters of nitrogen gas are needed to react with 90.0 g of potassium at STP in order to produce potassium nitride according to the following reaction? 6 K + N2 Ã 2 K3N
Answer:
1. 2.41 × 1023 formula units
2. 122 L
3. 7.81 L
Explanation:
1. Equation of the reaction: 2 Na(NO3) + Ca(CO3) ---> Na2(CO3) + Ca(NO3)2
Mole ratio of NaNO3 to CaCO3 = 2 : 1
Moles of CaCO3 = mass/molar mass
Mass of CaCO3 = 20 g; molar mass of CaCO3 = 100 g
Moles of CaCO3 = 20 g/100 g/mol = 0.2 moles
Moles of NaNO3 = 2 × 0.2 moles = 0.4 moles
1 Mole of NaNO3 = 6.02 × 10²³ formula units
0.4 moles of NaNO3 = 0.4 × 6.02 × 10²³ = 2.41 × 1023 formula units
2. Equation of reaction : 2 H2O ----> 2 H2 + O2
Mole ratio of oxygen to water = 1 : 2
At STP contains 6.02 × 10²³ molecules = 1 mole of water
6.58 × 10²⁴ molecules = 6.58 × 10²⁴ molecules × 1 mole of water/ 6.02 × 10²³ molecules = 10.93 moles of water
Moles of oxygen gas produced = 10.93÷2 = 5.465 moles of oxygen gas
At STP, 1 mole of oxygen gas = 22.4 L
5.465 moles of oxygen gas = 5.465 moles × 22.4 L/1 mole = 122 L
3.Equation of reaction: 6 K + N2 ----> 2 K3N
Mole ratio of Nitrogen gas and potassium = 6 : 1
Moles potassium = mass/ molar mass
Mass of potassium = 90.0 g, molar mass of potassium = 39.0 g/mol
Moles of potassium = 90.0 g / 39.0 g/mol = 2.3077moles
Moles of Nitrogen gas = 2.3077 moles / 6 = 0.3846 moles
At STP, 1 mole of nitrogen gas = 22.4 L
0.3486 moles of oxygen gas = 0.3486 moles × 22.4 L/1 mole = 7.81 L
1. Volume of oxygen 2.41 × 1023 units
2. Nitrogen gas 122 L
3. 7.81 L
What will be the volume of oxygen and nitrogen?Equation of the reaction:
[tex]\rm 2Na(No_3)+Ca(Co_3)---- > Na_2(Co_3)+Ca(No_3)_2[/tex]
[tex]NaNo_3\ and \ CaCo_3=\dfrac{2}{1}[/tex]
[tex]\rm Moles \ of \ CaCo_3=\dfrac{Mass}{Molar\ Mass}[/tex]
Mass of CaCO3 = 20 g; molar mass of CaCO3 = 100 g
[tex]\rm \ Moles \ of \ CaCo_3=\dfrac{20}{100} =0.2[/tex]
[tex]Moles \ of \ NaNo_3=2\times 0.2=0.4\ moles[/tex]
[tex]1\ mole\ of \ NaNo_3=6.02\times10^{23}[/tex]
0.4 moles of NaNO3 = [tex]0.4\times 6.02\times 10^{23}=2.41\times 10^{23}[/tex]
2. Equation of reaction :[tex]2H_2o---- > 2H_2+o_2[/tex]
The mole ratio of oxygen to water = [tex]\dfrac{2}{1}[/tex]
At STP contains
[tex]\dfrac{6.02\times 10^{24}\times 1 \ mole \ of \ water}{6.02\times 10^{23}} =10.93\ moles \ of \ water[/tex]
Moles of oxygen gas produced =
[tex]\dfrac{10.93}{2} =5.465\ Moles \ of \ oxygen \ gas[/tex]
At STP, 1 mole of oxygen gas = 22.4 L
5.465 moles of oxygen gas = [tex]5.465\times 22.4=122\ L[/tex]
3. Equation of reaction:
[tex]6k+N_2---- > 2K_3N[/tex]6
The mole ratio of Nitrogen gas and potassium = [tex]\dfrac{6}{1}[/tex]
[tex]Moles\ of \ potassium = \dfrac{Mass}{Molar\ Mass}[/tex]
Mass of potassium = 90.0 g,
molar mass of potassium = 39.0 g/mol
[tex]Moles\ of \ potassium = \dfrac{90}{39}=2.3077\ moles[/tex]
[tex]Moles\ of \ Nitrogen = \dfrac{ 2.3077}{6}=0.3846\ moles[/tex]
At STP, 1 mole of nitrogen gas = 22.4 L
0.3486 moles of oxygen gas =
[tex]0.3486\times 22.4=7.81\ L[/tex]
Thus
1. Volume of oxygen 2.41 × 1023 units
2. Nitrogen gas 122 L
3. 7.81 L
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Which of the following statements is true?
Answer:
option first is right answer
what is a characteristic of property acids pls help
Answer:
General Characteristics of Acids:
Sour taste (though you should never use this characteristic to identify an acid in the lab) Reacts with a metal to form hydrogen gas. Increases the H+ concentration in water. Donates H+ ions. Turns blue litmus indicator red.
3. In the picture, a girl with a weight of 540 N is balancing on
force exerted by the ground on her front wheel is 200 N,h
back wheel?
Answer:
340 N
Explanation:
Force formula
The force formula is defined by Newton's second law of motion: Force exerted by an object equals mass times acceleration of that object: F = m ⨉ a. To use this formula, you need to use SI units: Newtons for force, kilograms for mass, and meters per second squared for acceleration.
Equilibrium
It is a state of rest or balance due to the equal action of opposing forces. equal balance between any powers, influences, etc.; equality of effect. mental or emotional balance; equanimity: The pressures of the situation caused her to lose her equilibrium.
Electrophilic aromatic substitution of furan favors addition to the 2-position because the intermediate cation is more stable than addition to the 3-position. Draw the mechanism arrows for the Friedel-Crafts acylation of furan. In steps 1-3 draw the curved arrows to show the formation of the acyliumion electrophile and acylation of furan. In steps 4 and 5 draw all resonance structures for the intermediate cation, then showing reaction of the last resonance structure with FeCl4 to generate the final product. Make sure to draw lone pairs of electrons for all species and nonzero formal charges.
Answer:
See picture below
Explanation:
In the attached picture, you have the mechanism of all this reaction.
In the first step, as this is Friedel Craft acylation, we need to use either AlCl₃ or FeCl₃. So, this compound (I will use FeCl₃) will attach to the Chlorine group of the CH₃COCl.
In the second step, the whole CH₃CO is attached to the furan, because of the attack of the double bond of the ring.
After this, it occurs several resonance structure, to give a more stable structure, and the Hydrogen in the 2 position is substracted to give the final product of acylation.
Hope this helps.