Answer:
Answer. Explanation: Chlorine gas bleaches the damp litmus (red or blue). Bleaching is an oxidation process.
True or false: to get 8 valence electrons, oxygen can borrow or share some electrons
Answer:
True
Explanation:
In ionic compounds, oxygen borrows electrons. In covalent compounds, oxygen shares electrons.
When the gas shown in the Energy Distribution diagram is heated to "T2," what has happened?
Select all that apply.
The average kinetic energy has lowered.
The average kinetic energy has increased.
o The highest energy level has decreased.
Less molecules have a higher energy level.
More molecules have a higher energy level.
Answer:
The average kinetic energy has increased. More molecules have a higher energy level.
Explanation:
I so esay
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:
Question 10.
Which of the following are agricultural implements?
(a) Seed drills
(b) Silos
(c) Harrow
(d) All of these
93 Points!!! Which of the following join together to form molecules?
Atoms
Organisms
Organs
Tissues
Answer:
Atoms
Explanation:
Atoms are the smallest thing meaning they form molecules which are made of atoms.
Also, your question is not 93 points but whatever lol.
Answer:
Atoms
Explanation:
I took the test
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.
What is the value of for this aqueous reaction at 298 K?
A+B↽⇀C+D ΔG°=12.86 kJ/mol
K=
Answer:
The equilbrium constant is 179.6
Explanation:
To solve this question we can use the equation:
ΔG = -RTlnK
Where ΔG is Gibbs free energy = 12.86kJ/mol
R is gas constant = 8.314x10⁻³kJ/molK
T is absolute temperature = 298K
And K is equilibrium constant.
Replacing:
12.86kJ/mol = -8.314x10⁻³kJ/molK*298K lnK
5.19 = lnK
e^5.19 = K
179.6 = K
The equilbrium constant is 179.6Which 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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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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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%
ASAP. Which process represents a physical change?
1.Roasting a marshmallow over a camp fire
2.Melting chocolate in a pan on the stove
3.Bruising of a banana's skin after dropping on the floor
4.Bubbling due to an antacid tablet in vinegar
number of proton of gold
Answer:
English Language Learners Definition of number. (Entry 1 of 2) : a word or symbol (such as "five" or "16") that represents a specific amount or quantity. : a number or a set of numbers and other symbols that is used to identify a person or thing.
Explanation:
79 is the number of protons gold has.
Hope this helps; have a great day!
What is biocapacity?
PLZZ HELP TY
Answer:
Explanation:
The biocapacity or biological capacity of an ecosystem is an estimate of its production of certain biological materials such as natural resources, and its absorption and filtering of other materials such as carbon dioxide from the atmosphere.
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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Create a graphic organizer describing types of substances including the difference between pure substance and mixture with subtypes and examples.
SCAM ANSWERS WILL BE DELETED.
If you answer this seriously I will P.A.y.P.a.l you 2 dollars. just leave them in the comments of your answer
Answer:
Pure substances are further divided into elements and compounds. The combination of two or more pure substances is called a mixture. Mixtures can be classified into two types viz. heterogeneous and homogeneous mixtures.
Explanation:
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
If I have 100 mL of oil in a container and 100 mL of water in another
conta in er Which container wouldhave more mass?
Answer:
The answer is 200mL each amount have the same mass
Explanation:
100mL +100ML= 200mL mass in each container
Answer:
200ml
Explanation:
Ionisation enthalpy across the group (increase or decrease)
Give reasons??
Answer:
As we move from left to right across a period, the ionization energy of elements increases. This is due to the decrease in the size of atoms across a period.
Answer:
[tex]\huge\boxed{Answer\hookleftarrow}[/tex]
Ionization enthalpy (IE) is the energy required to remove the highest-energy electron from a neutral atom. In general, ionization energy increases across a period and decreases down a group.So, for your question ⇻ IE decreases down the group.____________________
ʰᵒᵖᵉ ⁱᵗ ʰᵉˡᵖˢ
# ꧁❣ RainbowSalt2²2² ࿐
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.
Which of the following statements is true?
Answer:
option first is right answer
1. How many grams of potassium chloride (KCI)
can be dissolved at 10°C?
Answer:
At 10 ∘C , the solubility of potassium chloride is measured to be 31.2⋅g per 100⋅g of water.
Explanation:
Enter an equation showing how this buffer neutralizes added aqueous acid (HI). Express your answer as a chemical equation. Identify all of the phases in your answer.
Answer:
[tex]H^++NH_3\rightleftharpoons NH_4^+[/tex]
Explanation:
Hello there!
In this case, since the buffer is not given, we assume it is based off ammonia, it means the ammonia-ammonium buffer, whereas the ammonia is the weak base and the ammonium ion stands for the conjugate acid. In such a way, when adding HI to the solution, the base of the buffer, NH3, reacts with the former to promote the following chemical reaction:
[tex]H^++NH_3\rightleftharpoons NH_4^+[/tex]
Because the HI is totally ionized in solution so the iodide ion becomes an spectator one.
Best regards!
Answer:
the above answer is wrong
Explanation:
its really not but the mastering chemistry says it is
Which of the following gases effuses most rapidly?
(Atomic mass of : H = 1 g/mol, C = 12 g/mol , N = 14 , g/mol , O = 16 g/mol , Cl = 35.5 g/mol )
a.
hydrogen chloride
b.
nitrogen
c.
carbon monoxide
d.
ammonia
e.
oxygen
Answer:
C. Carbon monoxide
This is my answer tell me if wrong
Ammonia among all the gases effuses most rapidly. Therefore, the correct option is option d.
A gas can escape or flow through a small aperture into a vacuum or a region with lower pressure through a process called effusion. It is a specific kind of gas flow that takes place in those circumstances. The square root of a gas's molar mass has an inverse relationship with the rate of effusion of that gas. The gas will effuse more quickly the lower the molar mass.
The molar mass are calculated as:
a. hydrogen chloride (HCl): H (1 g/mol) + Cl (35.5 g/mol) = 36.5 g/mol
b. nitrogen (N2): N (14 g/mol) + N (14 g/mol) = 28 g/mol
c. carbon monoxide (CO): C (12 g/mol) + O (16 g/mol) = 28 g/mol
d. ammonia (NH3): N (14 g/mol) + H (1 g/mol) + H (1 g/mol) + H (1 g/mol) = 17 g/mol
e. oxygen (O2): O (16 g/mol) + O (16 g/mol) = 32 g/mol
The square root of the molar masses are given as:
a. √36.5 ≈ 6.04
b. √28 ≈ 5.29
c. √28 ≈ 5.29
d. √17 ≈ 4.12
e. √32 ≈ 5.66
Ammonia has the lowest molar mass and hence the fastest effusion rate of all the gases.
Therefore, the correct option is option d.
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How many molecules are in 3 moles of CO2?
O A. 5.418 x 1024
OB. 1.806 x 1024
O C. 6.02 x 1024
O D. 1.806 x 1023
Answer:
1.806 × 10²⁴Explanation:
The number of molecules can be found by using the formula
N = n × L
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 3 × 6.02 × 10²³
We have the final answer as
1.806 × 10²⁴Hope this helps you
Answer: OB. 1.806 x 1024
Explanation:
Calculate the amount (in moles) of magnesium in 1.23 g.
Answer
0.32 is that answer
Explanation:
you just use the calculator
Which is the best example of a new substance forming?
cutting a piece of paper
lighting a match
popping a balloon
hitting a nail with a hammer
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
1. Write formulas for the binary ionic compounds formed between
the following elements:
a. potassium and iodine d. aluminum and sulfur
b. magnesium and chlorine e. aluminum and nitrogen
C. sodium and sulfur
The formulas for the binary ionic compounds are:
a. potassium and iodine: KI.b. magnesium and chlorine: MgCl₂.c. sodium and sulfur: Na₂S.d. aluminum and sulfur: Al₂S₃.e. aluminum and nitrogen: AlN.We want to write the formulas of different binary ionic compounds. to do so, we need to consider the octet's rule.
What is the octet's rule?The octet's rule establishes that atoms will lose, gain or share electrons to achieve the electron configuration of the nearest noble gas (8 valence electrons except for He with 2).
a. potassium and iodineK has 1 valence electron so it will lose 1 electron to form K⁺. I has 7 valence electrons so it will gain 1 electron to form I⁻. The neutral compound between K⁺ and I⁻ is KI.
b. magnesium and chlorine
Mg has 2 valence electrons so it will lose 2 electrons to form Mg⁺². Cl has 7 valence electrons so it will gain 1 electron to form Cl⁻. The neutral compound between Mg⁺²⁺ and Cl⁻ is MgCl₂.
c. sodium and sulfur
Na has 1 valence electron so it will lose 1 electron to form Na⁺. S has 6 valence electrons so it will gain 2 electrons to form S⁻². The neutral compound between Na⁺ and S⁻² is Na₂S.
d. aluminum and sulfurAl has 3 valence electrons so it will lose 3 electrons to form Al³⁺. S has 6 valence electrons so it will gain 2 electrons to form S⁻². The neutral compound between Al³⁺ and S⁻² is Al₂S₃.
e. aluminum and nitrogenAl has 3 valence electrons so it will lose 3 electrons to form Al³⁺. N has 5 valence electrons so it will gain 3 electrons to form N³⁻. The neutral compound between Al³⁺ and N³⁻ is AlN.
The formulas for the binary ionic compounds are:
a. potassium and iodine: KI.b. magnesium and chlorine: MgCl₂.c. sodium and sulfur: Na₂S.d. aluminum and sulfur: Al₂S₃.e. aluminum and nitrogen: AlN.Learn more about binary compounds here: https://brainly.com/question/7960132
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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What's the partial pressure of hydrogen in a gas mixture if its mole fraction is 0.1 and the total pressure is 325 torr?
Question 15 options:
325 torr
32.5 torr
100 torr
65 torr