What are five characteristics of a group on the periodic table?
24.0 mL of a 0.120 M Ca(OH)2 solution is required to titrate 160 mL of an HCl solution to its equivalence point. Find the moles of HCl and its concentration in molarity.
Answer: The molarity of HCl is 0.036 M and moles of HCl is 5.76 moles.
Explanation:
To calculate the molarity of HCl used to titrate [tex]Ca(OH)_2[/tex], we use the equation:[tex]n_1M_1V_1=n_2M_2V_2[/tex]
where,
[tex]n_1,M_1\text{ and }V_1[/tex] is the n-factor, molarity and volume of calcium hydroxide.
[tex]n_2,M_2\text{ and }V_2[/tex] is the n-factor, molarity and volume of hydrochloric acid.
We are given:
[tex]n_1=2\\M_1=0.120M\\V_1=24mL\\n_2=1\\M_2=?M\\V_2=160mL[/tex]
Putting values in above equation, we get:
[tex]2\times 0.120\times 24=1\times M_2\times 160\\M_2=0.036M[/tex]
Now, to calculate the number of moles, we use the equation:[tex]\text{Molarity}=\frac{\text{Number of moles}}{\text{Volume}}[/tex]
Molarity of HCl = 0.036 mol/mL
Volume of HCl = 160 mL
Putting values in above equation, we get:
[tex]0.036=\frac{\text{Number of moles}}{160}\\\\\text{Number of moles of HCl}=5.76mol[/tex]
Hence, the molarity of HCl is 0.036 M and moles of HCl is 5.76 moles.
What is the main difference between an isotope and an ion?
a. an ion has extra protons.
b. an isotope has extra neutrons.
c. isotopes are radioactive while ions are not.
d. an ion always has a positive or a negative charge?
Can anyone please tell me the reaction between...
•Hydrogen peroxide and a raw liver
•Hydrogen peroxide and a cooked liver
•And hydrogen peroxide and a frozen liver
Like can you explain to me if it bubbles or fizzes.
Thanks so much!
What is solubility? solubility is the minimum amount of a solvent that can be used to make a solution. solubility is the pressure necessary to create a solution. solubility is the temperature that can be used to mix a solution. solubility is the ability of one substance to dissolve in another?
Answer:
Option 4.
Explanation:
Solubility may be defined as the ability of a solute to dissolve in a solvent. The maximum ability of solute to dissolve in a solvent can be measured by its solubility.
For example: alcohol ( solute) can dissolve in a solvent( water). Alcohol has high solubility for water and can easily dissolve in water.
Hence, the correct answer is option 4.
When a substance has high solubility, it readily dissolves in a solvent, resulting in a concentrated solution. The correct statement is Solubility is the ability of one substance to dissolve in another.
Solubility refers to the maximum amount of a solute that can dissolve in a given amount of solvent at a specific temperature and pressure. It is a measure of how well a substance can dissolve in another substance to form a homogeneous mixture called a solution.
Solubility is typically expressed in terms of the amount of solute that can dissolve in a given amount of solvent, often measured in grams per liter (g/L) or moles per liter (mol/L). It is influenced by factors such as temperature, pressure, the nature of the solute and solvent, and the presence of other substances.
Therefore, the correct statement is: Solubility is the ability of one substance to dissolve in another.
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which functional group is found in an ester?
The functional group found in an ester is a carbonyl group with an attached second oxygen atom that is bonded to a carbonyl carbon substituent by a single bond, usually a pair of alkyl or aromatic groups. In addition, it can be shown in text as RCOOR or occasionally as ROCOR, which made them responsible in the distinctive and attractive odors and flavors of many flowers, perfumes, and ripe fruits.
What do all group 2 elements have in common?
They all gain two electrons to form a stable outer energy level.
They form covalent bonds with halogens.
They all react easily with the noble gases.
They tend to form ionic bonds by losing electrons.
Answer:
C is your answer
Explanation:
A mothball, composed of naphthalene (c10h8), has a mass of 1.64 g . part a how many naphthalene molecules does it contain?
A 50.0 mL sample of 1.54×10−2 M NaSO4 is added to 50.0 mL of 1.28×10−2 Ca(NO3)2. What percentage of the Ca2+ remains unprecipitated?,
If the solubility of a gas in water is 4.0 g/l when the pressure of the gas above the water is 3.0 atm, what is the pressure of the gas above the water when the solubility of the gas is 1.0 g/l? 4.0 atm 1.3 atm 0.75 atm 12 atm
The pressure of the gas above the water when the solubility of the gas is 1.0 g/L is 0.75 atm
Henry's lawThis states that the solubility of a gas in liquids at constant temperature is proportional to its pressure. Mathematically, it can be expressed as
S₁ / P₁ = S₂ / P₂
Where
S₁ is the initial solubility P₁ is the initial pressure S₂ is the new solubility P₂ is the new pressure How to determine the new pressureFrom the question given above, the following data were obtained
Initial solubility (S₁) = 4 g/LInitial pressure (P₁) = 3 atmNew solubility (S₂) = 1 g/LNew pressure (P₂) = ?S₁ / P₁ = S₂ / P₂
4 / 3 = 1 / P₂
Cross multiply
4 × P₂ = 1 × 3
4 × P₂ = 3
Divide both side by 4
P₂ = 3 / 4
P₂ = 0.75 atm
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An _______ bond forms when a cation transfers its extra electron to an anion who needs it.
a.metallic
b.covalent
c.ionic submit cancel end quiz
An ionic bond forms when a metal atom transfers its extra electron to a nonmetal atom, resulting in a cation and an anion that attract each other due to their opposite charges. Therefore, the correct option is: c.ionic.
An ionic bond forms when a cation transfers its extra electron to an anion that needs it. This type of bond is based on the electrostatic forces between two oppositely charged ions. Here is the step-by-step process:
A metal atom loses one or more valence electrons, becoming a positively charged ion, or cation.A nonmetal atom gains the electrons lost by the metal, becoming a negatively charged ion, or anion.The opposite charges of the cation and anion attract each other, creating a stable ionic bond.For instance, in sodium chloride (NaCl), the sodium (Na) atom donates its single valence electron to the chlorine (Cl) atom. As a result, Na turns into Na⁺ (a cation), and Cl becomes Cl⁻ (an anion), forming an ionic bond.
#1: Nitrogen (N) is made up of 99.632% 14N and 0.368% 15N. The atomic mass of 14N is 14.003 amu. The atomic mass of 15N is 15.000 amu. What is the average atomic mass of nitrogen?
A. 14.0 amu
B. 14.006 amu
C. 15.00 amu
D. 15.50 amu
**my answer: B.
but idk 100% :/,
If carbon monoxide reaches a temperature of over 1,100 degrees Fahrenheit, it will ignite in a combustion reaction with oxygen. What would the product(s) of the reaction be?
Answer:
2CO2 or A
Explanation: i just got its right!
What volume of 0.200 m hcl is required for the complete neutralization of 2.00 g of nahco3 (sodium bicarbonate)?
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 reactions?
Answer:8.59L
Explanation:
The other answer has all the right steps but the atomic mass of potassium is actually 39.098 not 19.
Final answer:
Approximately 8.58 liters of nitrogen gas are needed to react with 90.0 g of potassium to produce potassium nitride at STP, after calculating moles of potassium and its stoichiometric conversion to moles and then volume of nitrogen gas.
Explanation:
To determine how many liters of nitrogen gas are needed to react with 90.0 g of potassium to produce potassium nitride, we first need to understand the correct chemical reaction for forming potassium nitride from potassium and nitrogen gas. The reaction is as follows:
6 K(s) + N₂(g) → 2 K₃N(s)
Firstly, calculate the moles of potassium. The molar mass of potassium (K) is approximately 39.10 g/mol. Therefore, the moles of potassium in 90.0 g are calculated as:
90.0 g K × (1 mol K / 39.10 g K) = 2.30 mol K
From the balanced equation, it is clear that 6 moles of potassium react with 1 mole of nitrogen gas. Hence, the moles of nitrogen gas needed can be calculated as:
2.30 mol K × (1 mol N₂ / 6 mol K) = 0.383 mol N₂
At Standard Temperature and Pressure (STP), 1 mole of any gas occupies 22.4 liters. Therefore, the volume of nitrogen gas required at STP can be found as:
0.383 mol N₂ × 22.4 L/mol = 8.58 L N₂
Therefore, approximately 8.58 liters of nitrogen gas are needed to react with 90.0 g of potassium to produce potassium nitride at STP.
What property is primarily responsible for determining the type of electromagnetic energy and peak wavelength emitted by a star such as the Sun? A.density B.temperature C.volume D.composition
Answer: B. Temperature
Explanation:
The temperature of the star such as Sun is measured. Using this measurement, its peak wavelength and energy can be determined.
For determination of wavelength, Wien's displacement law is used. This law states that, the sun like body emits all kinds of wavelengths and thus is nearly a black body.
For black body, the peak wavelength emitted is inversely proportional to the temperature of the body. From the wavelength, energy can be calculated.
Temperature is the property which is primarily responsible for determining the type of electromagnetic energy and peak wavelength emitted by star.
Help me please 11 and 12
Fill in the blank: You can find the number of __________ in any atom by subtracting the atomic number from the mass number.
A.
electrons
B.
neutrons
C.
protons
The atomic number of an atom is the number of its electrons which is equal to the number of its protons. Mass number is the sum of number of protons and neutrons. Hence, substracting atomic number from mass number give us the number of neutrons.
What is mass number ?An atom is made of subatomic particles, electrons, protons and neutrons. The protons and neutrons are located inside the nucleus and the electrons revolving around the nucleus through fixed energy levels.
In a neutral atom, the number of electrons is equal to the number of protons. This number is called the atomic number of the atom. The sum of number of neutrons and number of protons is called mass number of the atoms.
Substracting atomic number from mass number is the subtraction of number of protons from the mass number. Hence, it gives the number of neutrons. Thus, option B is correct.
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What happens at the particle level in a chemical reaction?
PLEASE, COULD SOMEONE ANSWER THIS???
I AM REALLY STRESSED OUT!
When ions form they have the electron configuration of: A) Alkali Metals
B) Alkaline Earth Metal C) Halogens D) Noble Gas
Alkali metals have a general outermost electronic configuration of [tex] ns^{1} [/tex]
Alkali earth metals have a general outermost electronic configuration of [tex] ns^{2} [/tex]
The +1 ion of the alkali metals has a stable octet configuration of the nearest noble gas as the outermost ns electron is lost.
The +2 ion of the alkaline earth metals has a stable configuration of the nearest noble gas as the two electrons in the outermost ns shell are lost.
In a hydrogenation reaction, a catalyst is used to transform an ________ to an ________.
Final answer:
In a hydrogenation reaction, a catalyst helps transform an alkene into an alkane by lowering the activation energy and facilitating the addition of hydrogen atoms to the double bond of the alkene.
Explanation:
In a hydrogenation reaction, a catalyst is used to transform an alkene to an alkane. Catalysts speed up chemical reactions by lowering the activation energy without being consumed in the process. Common catalysts used in hydrogenation include finely divided metals such as platinum, palladium, and nickel. The process involves the alkene being adsorbed on the surface of the catalyst, followed by the addition of hydrogen atoms to the carbons of the double bond, resulting in a saturated hydrocarbon or alkane.
Consider four atoms from the second period: lithium, beryllium, boron, carbon, and nitrogen. Which of these elements has the lowest electronegativity value?
lithium
beryllium
boron
carbon
nitrogen
Answer: Option (a) is the correct answer.
Explanation:
It is known that value of electronegativity increases when we move from left to right in a periodic table.
Since the given atoms lithium, beryllium, boron, carbon and nitrogen are all second period elements. And the value of their electronegativity are as follows.
Lithium : 0.98
Beryllium : 1.57
Boron : 2.04
Carbon : 2.55
Nitrogen : 3.04
Thus, we can conclude that lithium has the least electronegativity.
Rocks are solids composed of one or more minerals true or false
What steps are important in the process of creating a scientific theory? (1 point)
hypothesizing, observing, and testing
creating a prototype and trouble-shooting
analyzing, offering an opinion, and evaluating
trouble-shooting, hypothesizing, and evaluating
The important steps in the process of creating a theory are the following: hypothesizing, observing, and testing. You first conduct observation to identify problem or situation that will lead to your theory. Next step is to formulate an intelligent guess called as the hypothesis. This hypothesis will be tested if it fit to be a theory.
Two balloons, one with a charge of 4.0 × 10-6 coulombs and the other with a charge of 8.2 × 10-6 coulombs, are kept 2.0 meters apart. What is the electric force between the two balloons? (k = 9.0 × 109newton·meter2/coulombs2) Show quoted text
Answer is C for plato users
7.3 × 10-2
I really don't get this question, could someone help
In a 1.0× 10–2 M solution of NH4ClO4(aq), identify the relative molar amounts of these species.
In a 1.0× 10–2 M solution of NH4ClO4(aq), the relative molar amounts of NH4+, ClO4-, and NH4ClO4 are 1:1:1.
Explanation:In a 1.0× 10–2 M solution of NH4ClO4(aq), the relative molar amounts of the species can be determined by looking at the balanced chemical equation for NH4ClO4 dissolving in water.
The balanced equation is NH4ClO4(aq) → NH4+(aq) + ClO4-(aq).
From the equation, we can see that for every 1 mole of NH4ClO4, 1 mole of NH4+ and 1 mole of ClO4- are produced.
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which of these natural resources is nonrenewable?
A: Hydroelectric
B: Corn
C: Geothermal
D: Coal
AgO --> Ag2O; balance this equation/charges,
Which two properties are explained by the pool-of-shared-electrons model for metals?
Answer:
Conductivity
Ductility
malleability
Explanation:
There are many properties of metals which can be explained by pool-of-shared electrons or electron sea model.
a) As electrons are considered to be free like in a sea so they are able to conduct electricity easily. Thus metals are conducting in nature.
b) The bonds are random in between metal atoms and can be broken easily and can be formed easily hence as per model the metal are highly ductile and malleable in nature.
Which of the following pairs of elements would most likely combine to form a salt?
O and F
I and F
Na and Al
K and I
K and I
Explanation:Salt is a neutral compound made up of a positive cation and a negative anion joint together via an ionic bond. Also, ionic bond is formed between metals and non metals. Furthermore, if the electronegativity difference between the metal and non metal is greater than 1.7 then it will go for ionic bonding. Let us calculate the electronegativity difference between the given pair of elements and predict the ionic bond between them.
1) F and O;
E.N of Fluorine = 4.00
E.N of Oxygen = 3.50
------------
Difference 0.50 (Not Ionic, No Salt Formation)
As both are non metals hence, the formation of ionic bond is not favored.
2) F and I;
E.N of Fluorine = 4.00
E.N of Iodine = 2.70
------------
Difference 1.30 (Not Ionic, No Salt Formation)
Again, both elements are non metals with less electronegativity difference, therefore no salt formation takes place.
3) Na and Al;
E.N of Aluminium = 1.60
E.N of Sodium = 0.90
------------
Difference 0.70 (Not Ionic, No Salt Formation)
Both are metals, hence ionic bond is not formed therefore, fails to form salt.
4) K and I;
E.N of Iodine = 2.70
E.N of Potassium = 0.80
------------
Difference 1.90 (Ionic, Salt Formation favored)
Potassium is a metal and Iodine is non metal also, electronegativity difference is greater than 1.7 hence, electron transfer takes place and results in the formation of ions and salt.