Answers
Related Questions
Because electrons move freely in metals, metals are____
Answers
The metals are defined as those substances which can form metallic bonds. Iron, copper, etc. are metals. Because electrons move freely in metals, metals are conductors of heat and electricity.
What is a metal?The metals are known as those substances which can donate electrons. They are electropositive in nature. An opaque, hard, shiny substances which can conduct heat and electricity due to the presence of free electrons are metals. All metals are malleable and ductile.
The metals contain one or two valence electrons. In order to attain stability they transfer the electrons. When these valence electrons are transferred rapidly to form a compound, there is a continuous flow of electrons in the lattice of compound.
Thus free electrons in metals are obtained due to their ability to transfer valence electrons and to achieve electrical neutrality.
Thus metals are conductors of heat and electricity.
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The following reaction shows the process of rusting. 4Fe + 3O 2 2Fe 2 O 3 This chemical reaction should be classified as _____.
Answers
Due to the Earth's shape and orientation, areas near the equator receive the greatest amount of energy from the Sun. Ocean currents
A. move only away from the equator as a result.
B. help to distribute this energy by warming other regions of the globe.
C. move only toward the equator as a result.
D. keep this energy concentrated in one region of the globe.
Answers
B. help to distribute this energy by warming other regions of the globe.
Welcome.
Areas near the equator receive the greatest amount of energy from the Sun because Ocean currents help in distributing this energy by warming up other regions of the globe. Thus, the correct option is B.
What is the effect of Ocean currents?Ocean currents including the ocean conveyor belt play an important role in the determination of how the ocean distributes heat energy throughout the planet Earth, thereby regulating and stabilizing the climate patterns in different regions of the planet.
Warm current moves away from the equator towards the poles whereas the cold currents concurrently move towards the equator. This process of movement of current waves is known as thermohaline circulation. The cold currents due to their higher density move in the great depth of the oceans while the warmer currents are on the surface due to their relatively lower density.
Therefore, the correct option is B.
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An internal combustion engine relies primarily on the efficient production of energy by the combination of oxygen (02) and gasoline (assume this is primarily octane, C8H18). Write the chemical equation for this reaction and derive the exact ratio of oxygen to octane for 100% efficiency.
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Balanced chemical reaction: C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O or multiply by 2:
2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O.
There same number of atoms on both side of balanced chemical reaction: eight carbon atoms, eighteen hydrogen atoms and twenty five oxygen atoms.
The minimum amount of carbohydrates needed daily is __________ grams.
Answers
The minimum amount of carbohydrates needed daily can vary from person to person depending on factors such as age, sex, activity level, and overall health.
However, in general, the recommended daily intake of carbohydrates is approximately 130 grams per day according to the Dietary Reference Intake (DRI) guidelines established by the Institute of Medicine. This recommended intake is based on the principle that carbohydrates are a primary source of energy for the body, especially for the brain and central nervous system.
It's important to note that not all carbohydrates are created equal, and a balanced diet should include a variety of carbohydrates from sources like fruits, vegetables, whole grains, and legumes, as they provide essential nutrients and dietary fiber. Individual requirements may vary, so it's advisable to consult with a healthcare professional or registered dietitian to determine the appropriate carbohydrate intake for specific dietary needs and health goals.
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Would precipitation occur when 500 mL of a 0.02M solution of \(AgNO_3\) is mixed with 500 mL of a 0.001M solution of NaCl? Show your work.,
Answers
NaCl + AgNO3 --> AgCl + NaNO3
To find out if precipitation will occur, we need to calculate the number of
moles acting in the chemical reaction
But Molarity, M=nV, where n is the number of moles and V is the volume in
litres. So n = M/V
number of moles of AgNo3 = 0.02/500 * 10^(-3)
n= 0.04
While n of Sodium chloride = 0.01/0.5 = 0.2. Since there is excess sodium chloride ( twice as much) precipitation will not occur. 2NaCl + 2AgNO3 -->
2AgCl + 2NaNO3. The reaction requires one and not two moles of AgNo3 as evident from the number of moles which is 0.04
PLEASE HELP!Suppose you begin with 1.50~g of the hydrate copper(II)sulfate · x-hydrate (CuSO4· x H2O), where x is an integer. After dehydration you find that you are left with 0.96~g of the an-hydrate CuSO4. What is the unknown integer x. Round your answer to the nearest integer, enter only an integer.
Suppose you begin with of the hydrate KAl(SO4)2 · 12H2O. After dehydration you find that you are left with 3.0~g of the an-hydrate KAl(SO4)2. How many grams did you start with? Write the value to the correct number of significance figures.
Answers
mass of water = 1.5 g - 0.96 g = 0.54 g
mole of water = [tex] \frac{0.54 g}{18 g/mole} = 0.3 mol[/tex]
mole of CuSO₄ = [tex] \frac{0.96 g}{159.6 g/mole} = 6 x 10^{-3} mol [/tex]
mole of water / mole of anhydrate = [tex] \frac{0.03}{6 x 10^{-3}} = 5 [/tex]
so x equal 5
For second problem:
After dehydration 12 H₂O evaporated decreasing mass by (12 x 18) = 216 g/mole
number of moles of KAl(SO₄)₂ = [tex] \frac{3}{258.2} = 0.0116 mol [/tex]
mass of evaporated water = 216 x 0.0116 = 2.5 g
Initial weight = 2.5 g + 3 g = 5.5 g
How many grams of co2 are in 6 mol of the compound and the units?
Answers
M(CO₂) = 12 g/mol + 2 · 16 g/mol.
M(CO₂) = 44 g/mol.
m(CO₂) = n(CO₂) · M(CO₂).
m(CO₂) = 6 mol · 44 g/mol.
m(CO₂) = 264 g.
n(CO₂)- amount of substance of carbon dioxide.
m(CO₂) - mass of carbon dioxide.
M(CO₂) - molar mass of carbon dioxide.
The term element refers to atoms that have the same number of _______.
A.
protons
B.
ions
C.
neutrons
D.
electrons
Answers
A. Protons
Carbon contains all atoms that have 6 protons and 6 electrons.
The term element refers to atoms that have the same number of protons. Thus, the correct option for this question is A.
What are protons?Protons may be defined as the type of subatomic particles which are significantly present within the nucleus of a chemical element along with neutrons. These subatomic particles are positively charged in nature. Ernest Rutherford was thought to be the discoverer of these particles.
According to the modern periodic table, chemical elements are arranged in their increasing order of atomic number where an atomic number is demonstrated by the number of protons which are unique for each element. These elements have atoms that possess an identical number of protons.
Therefore, the term element refers to atoms that have the same number of protons. Thus, the correct option for this question is A.
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Click here my friend
Answers
How do you find molality and molarity?
Answers
Molarity is equal to the moles of solute divided by liters of solution.
To calculate molality, divide the moles of solute by the kilograms of solvent. To calculate molarity, divide the moles of solute by the liters of solution. Consider the dissociation of ionic solutes when assessing boiling point elevation and freezing point depression.
Explanation:To find the molality of a solution, you can calculate it using the number of moles of solute and the mass of the solvent in kilograms. Molality (m) is defined as the number of moles of solute per kilogram of solvent, and the equation is: m = moles of solute / kilograms of solvent.
To find the molarity of a solution, you need to know the number of moles of solute and the volume of the solution in liters. The molarity (M) is the number of moles of solute per liter of solution, and the equation is: M = moles of solute / liters of solution.
When comparing different solutions, the molality can be used to determine the effect on boiling point and freezing point. If the solute is ionic, you should consider the number of particles it dissociates into, as this affects the total concentration of particles in solution. For example, in boiling point elevation and freezing point depression calculations, you can use the relevant equations to find the molality of a solution and from there find other properties like the molar mass of the solute.
What is incorrect about the atomic orbital arrangement of electrons in this model? How should they be arranged?
Answers
The model is incorrect because the first main energy level can only have two electrons and it shows five.
The electrons should be arranged in two concentric circles, each for one main energy level: 2 electrons must be on the inner circle (first energy level) and 3 electrons on the outer circle (second main energy level).
Explanation:
This model is used to indicate the electrons according to the main energy level (main quantum number).
The main energy levels or quantum numbers anre 1, 2, 3, 4, 5, 6, 7, .....
And these are the number of electrons that can be on each of those energy levels:
Main quantum number maximim number of electrons
1 2
2 8
3 18
4 32
The atom shown has five electrons. Accorgin with the table above, only two of those electrons may be in the first main energy level, the other three go on the second level.
Therefore, the model is incorrect because the first main energy level can only have two electrons and it shows five.
This model must show two concentric circles to arrange the five electrons,each for every main energy level or main quantum number, then 2 electrons must be arranged on the inner circle and 3 electrons on the outer circle.
20+ points
Balance the equation, if necessary, for the reaction between iron and oxygen
(Please see attachment)
If you could help with both problems that would be great, Thanks!
Answers
2. Its a combination reaction
I WILL GIVE YOU BRAINLEST
Some people think a deep tan is beautiful, but it is really the body's way of trying to protect itself from the damaging effects of the sun's radiation. Fill in the remaining parts of the table below to compare an ultraviolet photon with a photon in the visible range. (12 points)
Answers
Visible photon
λ = 649 nm
E = 3.061 * 10^ - 23 J
B) ultraviolet photon:
γ = 8.57 * 10^ 14 s^-1
E = 5.678 * 10^ -19 J
Explanation
1) Data:
A) visible photon
ν = 4.62 * 10 ^ 14 Hz
λ = ?
E = ?
B) Ultraviolet photon
λ = 350 nm = 350 * 10^ -9 m
ν = ?
E = ?
2) Formulae:
frequency: ν
wavelength: λ
speed of ligth: c
energy: E
h: Planck constant = 6.626 * 10^ -34 J.s
ν = c / λ
λ = c / ν
E = hν
3) Solution:
Visible photon
λ = c / ν = 3.00 * 10^ 8 m/s / 4.62 * 10 ^ 14 s^-1 = 6.49 * 10^ - 7 m = 649 nm
E = hν = 6.626 * 10 ^ - 34 J.s * 4.62 * 10 ^ 14 s^-1 = 30.61 * 10^ - 24 J = 3.061 * 10^ - 23J
Ultraviolet photon:
γ = c / λ = 3.00 * 10^ 8 m/s / (350 * 10^ -9m) = 8.57 * 10^ 14 s^-1
E = hν = h = 6.626 * 10 ^ -34J.s * 8.57 * 10^ 14 s^-1 = 5.678 * 10^ -19 J
which part of modern atomic theory was first developed by John Dalton?
A) Electrons are found in a cloud around the nucleus
B) Atoms are rearranged during chemical reactions
C) Atoms cannot be divided
D) Electrons are spread through an atom
Answers
Final answer:
Dalton's Atomic Theory initially proposed that atoms cannot be divided, but further advancements in modern atomic theory revealed the existence of subatomic particles. J. J. Thomson's discovery of electrons reshaped the understanding of atomic structure.
Explanation:
Dalton's Atomic Theory first stated the concept that atoms cannot be divided. However, we now know that atoms are composed of subatomic particles - protons, neutrons, and electrons - leading to the discovery that atoms are divisible.
Contrary to Dalton's belief, atoms are not indivisible as he proposed. Subsequent experiments led to the identification of these subatomic particles, marking a significant advancement in modern atomic theory.
J. J. Thomson discovered electrons through his research on cathode rays, contributing to the understanding that atoms are composed of smaller elements beyond what Dalton originally theorized.
A block of metal has a volume of 14.0in3 and weighs 5.26lb .
What is its density in grams per cubic centimeter?,
Answers
1 lb = 453.592 g
5.26 lb = 2385.896 g
V = 14 in3
1 in = 2.5 cm
1 in3 = 15.625 cm3
14 in3 = 218.75 cm3
Density = mass/volume
= 2358.896 / 218.75
= 10.783 g/cm3
Answer : The density of metal is [tex]10.399g/cm^3[/tex]
Explanation :
Density : It is defined as the mass of a substance contained per unit volume.
Formula used :
[tex]Density=\frac{Mass}{Volume}[/tex]
Given:
Mass of metal = 5.26 lb = 2385.896 g
conversion used : (1 lb = 453.592 g)
Volume of metal = [tex]14.0inch^3=229.419cm^3[/tex]
conversion used : [tex](1inch^3=16.3871cm^3)[/tex]
By using formula, we get:
[tex]Density=\frac{2385.896g}{229.419cm^3}[/tex]
[tex]Density=10.399g/cm^3[/tex]
Thus, the density of metal is [tex]10.399g/cm^3[/tex]
In what way did alchemists contribute to the development of modern chemistry? (Points : 3)
explained changes to matter in mystical, philosophical, or religious terms
created models of the internal structure of atoms
used experiments to analyze the relationship between gas pressure and volume
developed practical equipment, new procedures, and methods of identifying unknown substances @Trexy
Answers
Final answer:
Alchemists contributed to the development of modern chemistry by explaining changes to matter, developing practical equipment, and analyzing the relationship between gas pressure and volume.
Explanation:
Alchemists contributed to the development of modern chemistry in several ways:
Explained changes to matter in mystical, philosophical, or religious terms, which laid the foundation for later scientific investigation.Developed practical equipment, new procedures, and methods of identifying unknown substances, which improved the accuracy and efficiency of chemical experiments.Used experiments to analyze the relationship between gas pressure and volume, which led to the formulation of gas laws and a better understanding of the behavior of gases.A student crushes some calcium supplement tablets and dissolves them in water. The resulting solution feels slippery and has a slightly bitter taste. Are the supplement tablets most likely to be acids or bases?
Answers
Acids and bases have opposite properties and have the ability to neutralize each other. Acids taste sour, give sharp stinging pain in a wound and react with metals to produce hydrogen gas.
Bases turn red litmus paper blue and acids turn blue litmus paper red.
Answer:
bases
Explanation:
How many electrons does ga lose to achive noble gas arrangement?
Answers
₃₁Ga³⁺ 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰.
Predict which change would cause the heat of vaporization (segment 4) segment to be longer.
a.add heat at a faster rate.
b.the amount of the substance decreases.
c.the boiling point temperature increases.
d.the intermolecular forces of the substance get stronger.
Answers
Answer: option d. the intermolecular forces of the substance get stronger.
Justification:
1) The heat of vaporization is the heat required by a substance to overcome the intermolecular forces in the liquid state and pass to gas state.
2) From that, you can directly predict that the stronger the intermolecular forces the higher the heat of vaporization.
3) Graphycally that will be translated in a longer segment: the horizontal axis is time and the greater the heat of vaporization the longer the time needed.
Which of the following is a made of only glucose molecules?
(Points : 1)
ribose
lactose
sucrose
maltose
*** i think its B,
Answers
The answer is actually malotose, which is 2 glucose molecused joined by an alpha bond
Hope this helps :))
According to research, maltose is a disaccharide made of only glucose molecules.
What is maltose?It is a moderately sweet disaccharide formed from two glucose units connected by an α bond.
This biomolecule made up of two monosaccharides is the first product obtained during the digestion of starch by alpha-amylase, and is then broken down and transformed into glucose.
Therefore, we can conclude that according to research, maltose is a disaccharide made of only glucose molecules.
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How many milliliters of a 0.7% stock solution are required to make 2 l of 0.2% solution? how many ml of solvent will be required to carry out the dilution?
Answers
mass of solute= volume*concentration
mass1=mass2
volume1 * concentration1 = volume2 * concentration2
volume1 * 0.7%= 2L *(1000ml/L) * 0.2%
volume1 = 2000ml * (0.2%/0.7%)
volume1= 571.429 ml
2. Since you already have the volume of stock needed, you just need to subtract it from the total solution volume to count the number of solvents needed.
new solution volume= stock volume + diluting solvent volume
2L * 2000ml/L = 571.429ml + diluting solvent volume
diluting solvent volume= 2000ml- 571.429 ml= 1428.571ml
What is the name of CaCO2
Answers
Consider a solution containing 0.100 m fluoride ions and 0.126 m hydrogen fluoride. the concentration of hydrogen fluoride after addition of 5.00 ml of 0.0100 m hcl to 25.0 ml of this solution is __________ m.
Answers
The concentration of hydrogen fluoride after addition of 5.00 mL of 0.0100 M HCl to 25.0 mL of solution of fluoride ions and hydrogen fluoride is [tex]\boxed{0.107{\text{ M}}}[/tex].
Further Explanation:
Different concentration terms are utilized in determining the concentration of various solutions. Some of the most commonly used terms are written below.
1. Molarity (M)
2. Mole fraction (X)
3. Molality (m)
4. Parts per million (ppm)
5. Mass percent ((w/w) %)
6. Volume percent ((v/v) %)
Molarity is one of the concentration terms used very often in solutions. It is defined as moles of solute present in one litre of solution. The formula to calculate molarity of solution is as follows:
[tex]{\text{Molarity of solution}} = \dfrac{{{\text{Moles }}\left( {{\text{mol}}} \right){\text{of solute}}}}{{{\text{Volume }}\left( {\text{L}} \right){\text{ of solution}}}}[/tex] …… (1)
Rearrange equation (1) to calculate moles of solute.
[tex]{\text{Moles of solute}} = \left( {{\text{Molarity of solution}}} \right)\left( {{\text{Volume of solution}}} \right)[/tex] …… (2)
Substitute 0.0100 M for molarity of solution and 5.0 mL for volume of solution in equation (2) to calculate moles of HCl.
[tex]\begin{aligned}{\text{Moles of HCl}} &= \left( {0.0100{\text{ M}}} \right)\left( {5.0{\text{ mL}}}\right)\left( {\frac{{{{10}^{ - 3}}{\text{ L}}}}{{{\text{1 mL}}}}} \right) \\&= 0.00005{\text{ mol}} \\\end{aligned}[/tex]
Substitute 0.126 M for molarity of solution and 25.0 mL for volume of solution in equation (2) to calculate moles of HF.
[tex]\begin{aligned}{\text{Moles of HF}} &= \left( {0.126{\text{ M}}} \right)\left( {25.0{\text{ mL}}} \right)\left( {\frac{{{{10}^{ - 3}}{\text{ L}}}}{{{\text{1 mL}}}}} \right) \\&= 0.00315{\text{ mol}} \\\end{aligned}[/tex]
Number of moles of HF after addition of HCl can be calculated as follows:
[tex]\begin{aligned}{\text{Moles of HF}} &= 0.00315{\text{ mol}} + 0.00005{\text{ mol}} \\&= {\text{0}}{\text{.0032 mol}} \\\end{galigned}[/tex]
The total volume of solution is calculated as follows:
[tex]\begin{aligned}{\text{Total volume of solution}} &= {\text{5}}{\text{.0 mL}} + 25.0{\text{ mL}} \\&={\text{30}}{\text{.0 mL}} \\\end{aligned}[/tex]
Substitute 0.0032 mol for the moles of solute and 30.0 mL for volume of solution in equation (1) to calculate the concentration or molarity of HF solution.
[tex]\begin{aligned}{\text{Molarity of solution}} &= \left( {\frac{{{\text{0}}{\text{.0032 mol}}}}{{{\text{30}}{\text{.0 mL}}}}} \right)\left( {\frac{{1{\text{ mL}}}}{{{{10}^{ - 3}}{\text{ L}}}}} \right) \\&= 0.107{\text{ M}} \\\end{aligned}[/tex]
Learn more:
Calculation of volume of gas: https://brainly.com/question/3636135 Determine how many moles of water produce: https://brainly.com/question/1405182
Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Concentration terms
Keywords: concentration, concentration terms, HF, HCl, 0.107 M, 25.0 mL, molarity, moles, volume, 30.0 mL, 5.0 mL, 0.126 M, 0.0032 mol, 0.00005 mol, 0.00315 mol.
A 30.0-ml volume of 0.50 m ch3cooh (ka=1.8×10−5) was titrated with 0.50 m naoh. calculate the ph after addition of 30.0 ml of naoh at 25 ∘c.
Answers
CH3COOH + OH-↔ CH3COO- + H2O
we have to get the moles of acetic acid:
moles of acetic acid = volume of acetic acid per L * molarity
= 0.03 L * 0.5 M = 0.015 m
and the moles of NaOH = volume of NaOH * molarity
= 0.03 L * 0.5M = 0.015 m
and when the total volume = volume of acetic acid + volume of NaOH
= 0.03L + 0.03L = 0.06 L
So we can get the molarity of CH3COO- = moles of CH3COO/ total volume
= 0.015 mol / 0.06 L =0.25 M
and for the reaction :
CH3COO- + H2O ↔ CH3COOH + OH-
initial 0.25 0 0
equilibrium (0.25 - X) X X
and when Kw = 1 X 10^-14 and Ka = 1.8 X 10^-5 and Kb = Kw/Ka so:
Kw/Ka = [CH2COOH][OH]/[CH3COO]
(1x10^-14/1.8x10^-5) = X^2 / (0.25-X)
5.6x10^-10 = X^2/(0.25-X)
1.12 - (5.6x10^-10 X) = X^2
∴X = 1.2x10^-5 ∴[OH-] = 1.2x10^-5 M
when POH = - ㏒[OH-]
POH = -㏒(1.2x10^-5) = 4.9
and when POH + PH = 14
∴PH = 14- POH = 14 - 4.9 = 9.1
If the concentration of h2 is doubled, will the reaction rate quadruple, double, or remain the same?
Answers
1) If the rate law is first order on H2, then:
r = K [H2] / A
Since K is a constant and you are not varying A, then the rate will double if [H2] doubles.
2) If the rate law is second order on H2, then:
r = [H2]^2 / A
Again, since K is a constant and you are no varying A, then the rate will quadruple if [H2] is doubled because:
( 2 * [H2] )^2 = 4 [H2]^2
3) If the rate law is of zero order on H2, then the rate will remain the same, because the rate does not depend of the concentration of H2.
Which group of the periodic table does this element most likely belong to
Answers
The element which have 6 valence electrons belongs to the 16th group in periodic table which is called as the oxygen family.
What is periodic table?Periodic table is the classification of elements based on their properties into different rows and columns. The horizontal rows in the table is called periods and the vertical columns are called groups.
There are 7 periods and 18 groups in periodic table. From the left to right in a row, the atomic number increases. A group in periodic table contains elements with same valence electrons and similar physical and chemical properties.
The group number is equal to the number of valence electrons for first and second group. From 3 valence electrons, the group number is 10 added to the number of valence electrons.
Therefore, the group in which an element with 6 valence electrons is placed is 16th group.
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Your question is incomplete, but your complete question probably was:
An element has six valence electrons available for bonding. Which group of the periodic table does this element most likely belong to?
6.02 x 1022 molecules of HCl (molecular weight = 36.5 g/mole) in 2.0 liters of water
Answers
M = 0.100 / 2.00 L=0.0500
6.02 x 1022 molecules of HCl (molecular weight = 36.5 g/mole) in 2.0 liters of water. Therefore, M = 0.05
What is mole?The SI unit for measuring the quantity of any substance would be the mole, abbreviated as mol.
Given data:
Number of molecule = 6.02 x [tex]10^{22}[/tex] molecules
Molecular weight = 36.5 g/mole
Moles = 6.02 x [tex]10^{22}[/tex] / 6.02 x [tex]10^{23}[/tex] = 0.1mol
Hence, M = 0.1 /2 = 0.05
Therefore, M = 0.05
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The equation h3 po4 + 3koh → k3 po3 + 3h2 o is an example of which type of reaction?
Answers
Answer:
snythis
Explanation:
What is the mass in grams of 0.433 mol of Ca(NO3)2
Answers
Ca - 40 g/mol
N - 14 g/mol
O - 16 g/mol
the molar mass of the compound is calculated as follows;
Ca(NO₃)₂ --> 40 + 2(14 + 16x3)
= 164 g/mol
1 mol of the compound weighs 164 g
Therefore 0.433 mol = 164 g/mol x 0.433 mol
= 71.0g
the mass of 0.433 mol of the compound is 71.0 g