Select the compound In which chlorine is assigned the oxidation number +5.
O HCIO
O NACIO 3
O HCIO 2
O HCIO 4
O HCI
correct option is option B
Oxidation state of Na= +1
Oxidation state of O = +2
Let Oxidation state of Cl =x
Then,
(+1) + X + 3×(-2) = 0
X-5 = 0
so x = +5
Three elements, A, Q, and Z, have the molar masses indicated in the table below. Given a compound with a composition of 15.66% A and 84.34% Z by mass, what is the empirical formula of this compound? Remember to enter subscripts as normal numbers (ie H2O is entered as H2O) and to enter elements in the same order they were given.
element symbol molar mass
A 15.45 g/mol
Q 20.05 g/mol
Z 41.62 g/mol
The empirical formula of the compound containing 15.66% A and 84.34% Z as given from the question is AZ₂
Data obtained from the questionA = 15.66%Z = 84.34%Empirical formula =?How to determine the empirical formulaDivide by their molar mass
A = 15.66 / 15.45 = 1.014
Z = 84.34 / 41.62 = 2.026
Divide by the smallest
A = 1.014 / 1.014 = 1
Z = 2.026 / 1.014 = 2
Thus, the empirical formula of the compound is AZ₂
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Select the correct answer.
A compound has a molecular weight of 112.124 atomic mass units and the empirical formula C3H4O. What is the molecular formula of the compound? Use the periodic table to help you.
A.
C6H8O
B.
C9H12O3
C.
C8H4O2
D.
C4H8O2
E.
C6H8O2
.
Answer:
E
Explanation:
The empirical formula has a mass of
3*C = 3*12 = 36
4*H = 4*1 = 4
1*O = 1 * 16 = 16 Add
Total = 56
The actual mass of the molecule in nature is 112
Multiplier = nature's mass / empirical formula mass
Values
Nature's mass = 112
Empirical mass = 56
Solution
Multiplier = Natures mass/Empirical Mass
Multiplier = 112 / 56
Multiplier = 2
Formula
Nature's formula = (Emperical Mass)_multiplier
Nature's formula = (C3H4O)_2 Multiply
Nature's formula = C6H8O2
Check
C6 = 6*C = 6*12 = 72
H8 = 8*H = 8*1 = 8
O2 = 2*O = 2*16 = 32 Add
Total 112 which checks with what is given.
Which is not a conjugate acid-base pair?
Question 1 options:
H3O+ and H2O
H2O and OH-
NH3 and NH2--
NH4+ and NH3
HNO2 and H2O
Answer:
Explanation:
''A conjugate acid is formed when a proton is added to a base, and a conjugate base is formed when a proton is removed from an acid.''
In a conjugate acid-base pair, only difference between molecules is the amount of ''H''
One molecule must have 1 more H
in the last example HNO2 and H2O, difference is not only the H amount also H2O doesn't have N. So we can't say they are conjugate acid-base pair.
Calculate molecular mass of Ca(OH)2
Answer:
The molar mass of calcium hydroxide,
Ca(OH)2, is 74.092 g/mol.
Explanation:
The molar mass of a compound is determined by multiplying the subscript of each element in the formula by its molar mass (atomic weight on the periodic table) in g/mol, and adding the results.
The formula for calcium hydroxide is: Ca(OH)2
Molar Mass Ca(OH)2:
(1×40.078g/mol Ca)+(2×15.999g/mol O)+(2×1.008g/mol H)
=74.092 g/mol Ca(OH)2
Answer:
74.093 g/mol
Explanation:
Add the mass of Ca (found on the periodic table), the mass of 2 oxygens and 2 hydrogens together.
40.078+2(15.999)+2(1.00784)=74.093
what is 1+1? answer in full sentences.
A change that produces a new substance is a _______ change
Answer is chemical change
The reaction between bromine and methylpropene is an electrophilic addition. Describe .with the aid of curly arrows ,the mechanism of the reaction. Show that the intermediate and the product along with any dipoles and and lone pair of electron.
Electrophillic addition occurs when the substrate has a double bond and the attacking agent is a electrophile.
What is electrophillic addition?The term electrophillic addition refers to a type of addition that occurs when the substrate has a double bond and the attacking agent is a electrophile.
The mechanism of the electrophillic attack on methyl propene as shown indicates that the attacking agent is an electrophile(Br^+).
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Convert 4.92 L of hydrogen at STP to moles.
a 0.202 mol H2
b 0.444 mol H2
C 0.220 mol H2
d 4.55 mol H2
Answer:
c. 0.220 mol H₂
Explanation:
No. of moles
Volume present / Volume at STP4.92 L / 22.4 L0.220 mol H₂[tex]{\huge{\fcolorbox{yellow}{red}{\orange{\boxed{\boxed{\boxed{\boxed{\underbrace{\overbrace{\mathfrak{\pink{\fcolorbox{green}{blue}{Answer}}}}}}}}}}}}}[/tex]
[tex] \sf C) \: 0.220 \: mol \: H_2[/tex]
Explanation:
1 mol = 22.4 litres
4.92 = how many moles?
[tex] \sf \implies \frac{4.92}{22.4} \\ \\ \sf \implies 0.2196 \\ \\ \sf \implies 0.220 \: mol \: H_2[/tex]
4 Identify Give an example of a physical change and an example of a chemical change.
Answer:
Answer below
Explanation:
Physical changes dont change the chemical makeup of an object. An example would be to tear a piece of paper. Tearing the paper doesnt change how the paper was made chemically
Chemical changes on the other hand do change the chemical makeup of an object. An example of a chemical change would be to bake a cake. The reason being that the chemical makeup of the cake batter is changed so that the actual cake is formed.
the number of nucleons of an isotope represents the total number of..
Answer:
The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. The mass number is different for each different isotope of a chemical element.
from the following chemical reaction , calculate the moles of mg if 3.5 mol of hcl in reactant mg + 2hcl --> mgcl2 + h2
Describe in your own words, why a balloon, after it has been rubbed on a sweater, floats back towards the sweater when released.
Your answer must contain electric force, attract, electrons, and protons.
Explanation:
By rubbing the balloon on a sweater, you can transfer negative charges onto the surface of the balloon
The half-life of a certain element is 100 days. How many half-lives will it be before only one-fourth of this element
remains?
4
50
25
2
Distinguish between boiling, melting, and sublimation
Answer:
Boiling: The process of conversion from liquid to gas on heating is called boiling.
Example: Water on heating turns into water vapour.
Melting: The process of conversion from solid to liquid at room temperature is called melting.
Example: Ice cream melting at room temperature.
Sublimation: The Conversion of solid to gas directly is called sublimation.
Example: Camphor, Dry ice
Explanation:
Hope it helps you:))))
Does the size of the nucleus affect the possibility of nuclear fission or fusion happening?
what type of element is always radioactive?
based on location on the periodic table, which metal is likely to be less reactive than both strontium and sodium?
Answer:
Magnesium is likely to be less reactive than both strontium and sodium
Answer:
The answer is Magnesium (Mg)
a)6.144
b)0.644
c)-0.644
Answer:
b
Explanation:
is the dictionary definition of a word.
is the feeling or idea associated with a word.
Mention five characteristics of an ideal fuel
Answer:
Ideal fuel shows the following characteristics:
• It should be less expensive,
• It should be easily available,
• It should produce a large amount of heat,
• It can be transported easily.
• It has high calorific value.
• It should burns easily in air at a moderate rate.
If 50 grams of CaCl2 is dissolved in 100g of water at 10 degrees. Is the solution saturated, unsaturated, or supersaturated?
Find solubility
Mass of solute/Mass of solvent×10050/100×10050%So half amount of solute is dissolved .
Hence the solution is saturated
In an experiment, the same mass of magnesium metal reacted with the same amount of two different acids. the acid used in reaction 1 was ethanoic acid and in reaction 2 it was hydrochloric acid. which reaction produced the most gas?
The mole ratio of the reaction shows that equal volumes of hydrogen gas will be produced by the two reactions.
What is the mole ratio of a reaction?The mole ratio of a reaction is the ratio in which the reactants and products of a given reaction occur for the reaction to proceed to completion.
The mole ratio of a reaction is also known as the stoichiometry of the reaction.
The equation of the two reactions are given below:
[tex]Mg + 2HCl \rightarrow MgCl_2 + H_2[/tex]
[tex]Mg + 2CH_3COOH \rightarrow (CH_3COO)_2Mg + H_2 \\ [/tex]
From the equation of the reaction reaction, an equal volume of hydrogen gas will be produced by the two reactions.
Therefore, the mole ratio of the reaction shows that equal volumes of hydrogen gas will be produced by the two reactions.
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How does an unconformity affect our geological knowledge of an area?
Answer:
Because the Earth is always shifting, so research has to constantly be updated.
NEED THIS ASAP PLEASE HELP!! WILL GIVE 10 PTS!! WILL MARK BRAINLIST!!
The base Ba(OH)2 neutralizes the acid H2SO4 according to the equation below. What salt is produced?
H2SO4 + Ba(OH)2 -->
A. BaSO4
B. BaH2
C. BaH2S
D. BaO4
Answer:
According to the equation below salt is produced by BaH2s
Answer:
I think b is the correct answer
What is the ph of a 0.00043 molar solution of lithium hydroxide (lioh)?
Answer:
pH = 10.63.
Explanation:
Recall that lithium hydroxide (LiOH) is a strong base and hence dissociates completely into Li⁺ and OH⁻ ions.
Therefore, the concentration of OH⁻ ions is equivalent to the concentration of the base.
Find pOH:
[tex]\displaystyle \begin{aligned} \text{pOH} & = -\log[\text{OH}^-] \\ \\ & = -\log(0.00043) \\ \\ & = 3.37 \end{aligned}[/tex]
Using the relationships between pH and pOH, hence determine pH:
[tex]\displaystyle \begin{aligned}\text{pH} + \text{pOH} & = \text{p}K_w = 14.00 \\ \\ \text{pH} & = 14.00 - 3.37 \\ \\ & = 10.63\end{aligned}[/tex]
In conclusion, the pH of the solution is about 10.63.
Hydrogen gas is collected over water at a total pressure of 95.0kPa. The volume of gas collected is 28.0mL at 25.0˚C. Determine the partial pressure of the hydrogen gas if the water vapor pressure is 3.17kPa.
GAS LAW:
Given:
Unknown:
Formula:
Solution:
The partial pressure of the hydrogen gas, if the water vapor pressure is 3.17kPa is 91.83 kPa.
What is Dalton's law of gas?Dalton's law of gas states that total pressure of the mixture of gas is equal to the sun of the partial pressure of the individual gas.
Given that,
Total pressure of hydrogen gas = 95 kPa
Partial pressure of water vapor = 3.17 kPa
Partial pressure of hydrogen gas will be calculated as:
Partial pressure = 95 - 3.17 = 91.83 kPa
Hence required partial pressure is 91.83 kPa.
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The concentration of reactants and products and the rate of reaction were measured during a chemical reaction. After the first 3 seconds, the rate of reaction was 1.8 x10−6 M/s. Which of the following would explain a lower rate after another 3 seconds?
The concentration of reactants increased while the concentration of product decreased.
The concentration of reactants decreased while the concentration of product increased.
All concentrations of reactants and products decreased.
All concentrations of reactants and products increased.
Lower rate after another 3 seconds of the given rate is concentration of reactants increased while the concentration of product decreased.
What is the rate of reaction?Rate of the reaction gives idea about the speed of the completion of the reaction or the formation of product.
Given rate of reaction = 1.8×10⁻⁶ m/sec
After 3 seconds rate of the reaction decreases, which means speed of the formation of product decreases as a result of which:
Concentration of product decreases.Concentration of reactant increases.Hence, concentration of reactants increased while the concentration of product decreased.
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Answer:
B. The concentration of reactants decreased while the concentration of product increased.
Explanation:
i took the test
A mole is known by what other name?
Answer: avogadros number/constant
Explanation:
elect the correct answer. What is the formula of sulfurous acid? A. H2S B. HSO4 C. H2SO4 D. H2SO3
H2SO3 is the correct answer. I understand school is hard, but WORK HARDER!
A container with two gases, helium and argon, is 30.0% helium. Calculate the partial pressure of helium and
argon if the total pressure inside the container is 4.00 atm.
Answer:
helium=1,2atm
argon=2,8atm
Explanation:
partial is pressure exerted by each gas in a system since 30% is helium it means 70% is argon
argon =70%x4
helium=30%4
Dalton's law of partial pressure is applicable to only ideal gas not to the vanderwaal gases. The partial pressure of helium and argon is 1.2atm and 2.8atm respectively.
What is Dalton's law of partial pressure?According to Dalton's law of partial pressure, the total pressure of a mixture of gases is equal to the total sum of partial pressure of individual exerting on the walls of the container.
Mathematically,
Partial pressure=total pressure× mole fraction
Total pressure= 4.00 atm
percentage of helium = 30%=0.3
percentage of argon=100-30%=70%=0.7
Substituting the given values in above equation
Partial pressure of helium=4.00 atm× 0.3
Partial pressure of helium=1.2atm
Partial pressure of argon = 4.00 atm× 0.7
Partial pressure of argon = 2.8atm
Therefore, the partial pressure of helium and argon is 1.2atm and 2.8atm respectively.
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