Answer: Titanium has 22 protons
Explanation: If an atoms donates 4 electrons, it forms cation with charge +4. So original atom have 22 electrons and because atom is neutral, it has 22 protons. Number of neutrons does not matter, there are more neutrons than protons in heavier atoms.
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 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:
A popular classroom demonstration consists of filing notches into a new penny and soaking the penny in hydrochloric acid overnight. Because new pennies are made of zinc coated with copper, and hydrochloric acid dissolves zinc and not copper, the inside of the penny is dissolved by the acid, while the outer copper shell remains. Suppose a penny contains 2.5 g of zinc and is soaked in 20.0 mL of 6.0 M HCl. Calculate the concentra- tion of the HCl solution after all of the zinc has dissolved. Hint: The Zn from the penny is oxidized to Zn2
Answer:
[tex]HCl conc=2.2M[/tex]
Explanation:
From the question we are told that:
Mass of zinc [tex]Mass_{z_n}=2.5g[/tex]
Initial conc of HCl [tex]HConc_1=6.0M[/tex]
Initial volume of HCl [tex]Hvol_1=20.0mL[/tex]
Molar mass of zinc [tex]M_{Z_n}=65.38g/mol[/tex]
Generally the equation for reaction is mathematically given by
[tex]2HCL+Zn\implies ZnCl_2 +H_2[/tex]
Generally the equation for moles of zinc [tex]m_{z_n}[/tex] is mathematically given by
[tex]m_{z_n}=\frac{Mass_{Z_n}}{M_{Z_n}}[/tex]
[tex]m_{z_n}=\frac{2.5g}{M_{65.38}}[/tex]
[tex]m_{z_n}=0.038molZn[/tex]
Generally the equation for moles of [tex]m_{HCl}[/tex] is mathematically given by
[tex]m_{HCl}=HConc_1*Hvol_1[/tex]
[tex]m_{HCl}=6.0M*20.0mL[/tex]
[tex]m_{HCl}=6.0M*20.0*10^{-3}L[/tex]
[tex]m_{HCl}=0.12\ mol\ HCl[/tex]
Generally the reacted moles of HCl [tex]HCl_[reacted][/tex] is mathematically given by
Since
Zn:HCl =1:2
Therefore
[tex]HCl_[reacted]=0.038*\frac{2}{1}[/tex]
[tex]HCl_[reacted]=0.076mol \ HCl[/tex]
Generally the moles of HCl after Zn oxidization X is mathematically given by
[tex]x=0.12-0.076[/tex]
[tex]x=0.044 mol HCl[/tex]
Generally the conc of hydrochloride acid X is mathematically given by
[tex]X=\frac{0.044}{0.020}[/tex]
[tex]X=2.2 M Hcl[/tex]
Therefore Conc of HCl
[tex]HCl conc=2.2M[/tex]
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
9. How much power is flowing into your house if the voltage is 120 V and the current is 50 A? Use the formula P = VI.
O A. 1200 Watts
O B. 240 Watts
O C. 6000 Watts
O D. 4800 Watts
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
Question 10.
Which of the following are agricultural implements?
(a) Seed drills
(b) Silos
(c) Harrow
(d) All of these
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
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:
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.
How many elements of oxygen are present in the molecule below 3Ca(OH)2
Answer:
Two elements of oxygen are presented.
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
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 ࿐
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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HELP !! Which statement describes a periodic trend of electronegativity?
A. Electronegativity increases from right to left across a period.
B. Electronegativity increases from left to right across a period.
C. Electronegativity increases from top to bottom of a group.
D. Electronegativity remains the same within a period.
Answer:
B
Explanation:
Which of the following molecules is classified as a carbohydrate?
Answer:
I think it's Glycogen.....
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:
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:
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.
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:
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
balance Al2O3 + NaOH + H2O = NaAl(OH)4
Answer:
Al₂O₃ + 2 NaOH + 3 H₂O = 2 NaAl(OH)₄
Which of the following statements is true?
Answer:
option first is right answer
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.
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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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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Specific heat is a common name for which of the following?
Answer:
heat capacity. (another term used for specific heat)The amount of heat required to raise the temperature of a specified amount of a substance by 1°C or 1 K.
Explanation:
Specific heat is a common name for:
Massic heat capacitySpecific heat is the term that is used to describe the amount of heat which would be sufficient to change the temperature of a unit mass by one degree.
As a result of this, we can see that if the specific heat that is needed to change the temperature of water is found, then it can be easily determined if the water has reached its boiling point.
Therefore, another name for specific heat is also massic heat capacit
Please note that your answer is incomplete and as a result of this, i would be giving you a general overview which should help you get the correct answer.
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If you had 6H2 molecules and 4O2 molecules, how many H2O molecules could you produce?
Answer:
6
Explanation:
As , 2H2 + O2 = 2H2O
with 6 H2, 4O2 is excess.
H2O molecules formed = 6
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%