The diagram below shows a group of water molecules.
The water molecules in the diagram are attracted to each other by
Answer:
hydrogen bonds, the positive and negative charges of the hydrogen and oxygen atoms that make up water molecules makes them attracted to one another.
Using the periodic table, determine the number of PROTONS for the element Li
An eraser is an example of —
Group of answer choices
an insulator
a closed circuit
a conductor
an open circuit
Answer:
Insulator
Explanation:
An eraser can't conduct electricity, which makes it an insulator.
kadalasang pinupuntahan ng mga patalastas
If Lead (II) nitrate reacted with iron (III) acetate what would the balanced formula be?
Answer:
Explanation:
3Pb(ii)(NO3)2 + 2Fe(iii) ( C2H3O2 )3 ===> 3Pb( C2H3O2)2 + 2Fe(NO3)3
I know you have likely been given this as a homework assignment, but in real life I doubt you would be able to see any reaction taking place. The products are likely both soluble and both ionize, so I don't think you will get any kind of reaction taking place.
The equation however is balanced.
1. The pH of a solution made by combining 150.0 mL of 0.10 M KOH with 50.0 mL of 0.20 M HBr is closest to which of the following?
Answer:
12
Explanation:
The pH of the solution prepared has been 1.25.
The pH of the solution resulting from the mixing of the two solutions can be given by:
Hydrogen ion concentration = [tex]\rm \dfrac{M_1V_1\;-\;M_2V_2}{V_1\;+\;V_2}[/tex]
Where, M1 and M2 have been the molarity of the solution and V1 and V2 have been the volume of the solutions.
For the given resulted solution:
Hydrogen ion concentration = [tex]\rm \dfrac{0.1\;\times\;0.15L\;-\;0.2\;\times\;0.05L}{0.15\;+\;0.05\;L}[/tex]
Hydrogen ion concentration = 0.055 M
pH can be defined as the negative logarithm of hydrogen ion concentration.
pH = - log (Hydrogen ion concentration)
pH = -log (0.055)
pH = 1.25
The pH of the solution prepared has been 1.25.
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A chemical equation representing the reaction of water (HOH) and hydrochloride acid (HCI) is shown.
HOH + HCl + Cl + H2O
Which of the following statements best explains the chemical action of the reactants in the equation?
Answer:
That is Hydrolysis reaction.
[tex]HCl _{(aq)} \: + \: _{(aq)} \: - - > \: H ^{ + }_{(aq)} \: + \: Cl {}^{ - } _{(aq)}[/tex]
what is a fossil? and what can a fossil tell us about an organism
What are the types of changes that occur when matter is heated ? Which of these changes produce new substances ?
When you heat something, you add energy to it. This causes the particles to move faster and farther apart. Heating solids turns them into liquids. Turning a solid into a liquid is called melting. Chemical Changes are also called Chemical Reactions. Chemical reactions involve combining different substances. The chemical reaction produces a new substance with new and different physical and chemical properties.
Arteries
have very thin walls
o appear bluish in color
o carry blood away from the heart
connect capillaries and veins
Answer:
carry blood away from the heart
PLEASE HELP!!!!
Which bond would be the least polar?
1) H-Br (hydrogen-bromine)
2) H-F (hydrogen-fluorine)
3) H-H (hydrogen-hydrogen)
4) H-O (hydrogen-oxygen)
Answer:
[tex]\boxed {\boxed {\sf 3. \ H-H}}[/tex]
Explanation:
To determine the polarity of a bond, we use the electronegativities of the individual atoms. The greater the difference, the more polar the bond.
1. H-Br
Hydrogen: 2.2 Bromine: 3.03.0-2.2=0.8
2. H-F
Hydrogen: 2.2 Fluorine: 4.04.0-2.2=1.8
3. H-H
Hydrogen: 2.22.2-2.2=0.0
4. H-O
Hydrogen: 2.2Oxygen: 3.43.4-2.2=1.2
As we can see, the lowest difference is in hydrogen hydrogen at 0.0. You may also recognize that because they are 2 atoms of the same element, the electronegativity is the same for both, so it will equal 0. Since the electronegativity is 0, this is a nonpolar bond.
The total pressure is distinct from the individual partial pressures of a mixture.
A. True
B. False
Answer:
the answer is true :)
What quantity of copper is deposited by the same quantity of electricity that deposited 9g of aluminum
Answer:
Mass of copper deposited = 31.75 g
Explanation:
According to Faraday's second law of electrolysis, when the same quantity of electricity is passed through different electrolytes, the relative number of moles of the elements deposited are inversely proportional to the charges on the ions of the elements.
From this law, it can be seen that the higher the charge, the lower the number of moles of a given element deposited.
Number of moles of aluminium in 9 g of aluminium = mass / molar mass
Molar mass of aluminium = 27 g
Number of moles of aluminium = 9/27 = 1/3 moles
Charge on aluminium ion = +3
3 moles of electrons will discharge 1 mole of aluminium,
1 mole of electrons will discharge 1/3 moles of aluminium
Number of moles of electrons involved = 1 mole of electrons
Charge on copper ion = +2
1 mole of electrons will discharge 1/2 moles of copper.
Mass of 1/2 moles of copper = number of moles × molar mass of copper
Molar mass of copper = 63.5 g
Mass of copper deposited = 1/2 × 63.5 = 31.75 g
In order to develop ideas for a new tennis racket, a design team visits three different sporting goods stores. What part of the desining process is this?
Answer:
Generate concept.
Explanation:
The process of designing includes many processes out of which the process of developing the idea for a new product is called Generate concept.
Product idea( concept) generation is a act that begins with a list of criteria set by the client regarding his necessities and preferences. Based on the criteria, concept generation aims to pinpoint a range of potential ideas and solutions that addresses those needs.
Great Sand Dunes National Park in Colorado is famous for its giant sand dunes. Sand dunes are landforms that are found in deserts and on beaches. Visitors to the park can surf down the dunes on sleds or boards.
Which process causes the shape of these giant dunes?
A. deposition
B. erosion
C. weathering
D. waves
ADD NOTE
QUESTION GUIDE EXIT TES
3. A sample of 0.0400 mol potassium hydroxide, KOH was dissolved in water to yield 20.0 ml of
solution. What is the molarity of the solution?
Answer:
2.00 M KOH
Explanation:
Divide moles by volume and make sure your volume is in LITERS, not mL.
0.0400 mol KOH / 0.0200 L = 2.00 M KOH
A sample of 0.0400 mol potassium hydroxide, KOH was dissolved in water to yield 20.0 ml of solution. The molarity of the solution is 2.00 M KOH.
What is molarity?Molarity is the measure of the concentration of any solute in per unit volume of the solution.
[tex]M = \dfrac{n}{V}[/tex]
Given, the 0.0400 mol potassium hydroxide
20.0 ml volume
Putting the values in the equation
[tex]\dfrac{0.0400 mol }{ 0.0200 ml} = 2 M[/tex]
Thus, the molarity of the solution is 2.00 M KOH.
Learn more about molarity
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the minister in change of religious and charititable patreonage was known as
Answer:
sadr
Explanation:
Pls give brainlist
Please help me out here please
The equilibrium constant for the reaction shown below is Kc=0.0091. If the equilibrium concentrations of A and B are 0.031 M and 0.0823 M, respectively, what is the equilibrium concentration of C?
Answer:
[tex][C]=0.0221M[/tex]
Explanation:
Hello there!
In this case, according to the given chemical reaction at equilibrium:
[tex]3A\rightleftharpoons 3B+2C[/tex]
It is possible for us to set up the equilibrium expression as shown below:
[tex]Kc=\frac{[B]^3[C]^2}{[A]^3}[/tex]
Whereas Kc, [A] and [B] are known as 0.0091, 0.031M and 0.0823M and it is required to calculate [C]; thus, we solve for it as follows:
[tex][C]^2=\frac{[A]^3Kc}{B]^3}[/tex]
[tex][C]=\sqrt{\frac{(0.031)^3*0.0091}{(0.0823)^3}}[/tex]
[tex][C]=0.0221M[/tex]
Best regards!
distinguish between electron and neutron
Answer:
Explanation:
Electrons are a type of subatomic particle with a negative charge
Neutrons are a type of subatomic particle with no charge (they are neutral)
Study the map. Then use the drawing tool to create a model of how the two air masses look when they interact at front 1.
Answer: Picture
Explanation: I got it right
Answer:
2 and 3 look like a cold front in front of 1.
Explanation:
3 is an occluded front which occurs when a cold air mass devours a warm air mass and then collides with another cold mass. 2 is a warm air mass, and 1 is a cold air mass.
how does salt alter the boiling point and freezing point of water
Answer:
adding salt is like adding an impurity therefore the boiling point might increase from 100°c to maybe 102°c
Exothermic reactions have _____ net bond energy.
A) positive
B) negative
C) neutral
What is the mass of 8.23 x 10^23 atoms of Ag
Answer:
[tex]\boxed {\boxed {\sf Approximately \ 147 \ g\ Ag}}[/tex]
Explanation:
Convert Atoms to Moles
The first step is to convert atoms to moles. 1 mole of every substance has the same number of particles: 6.022 ×10²³ or Avogadro's Number. The type of particle can be different, in this case it is atoms of silver. Let's create a ratio using this information.
[tex]\frac{6.022*10^{23} \ atoms \ Ag}{1 \ mol \ Ag}[/tex]
We are trying to find the mass of 8.23 ×10²³ silver atoms, so we multiply by that number.
[tex]8.23 *10^{23} \ atoms \ Ag *\frac{6.022*10^{23} \ atoms \ Ag}{1 \ mol \ Ag}[/tex]
Flip the ratio so the atoms of silver cancel. The ratio is equivalent, but places the other value with units "atoms Ag" in the denominator.
[tex]8.23 *10^{23} \ atoms \ Ag *\frac{1 \ mol \ Ag}{6.022*10^{23} \ atoms \ Ag}[/tex]
[tex]8.23 *10^{23} *\frac{1 \ mol \ Ag}{6.022*10^{23} }[/tex]
Condense into one fraction.
[tex]\frac{8.23 *10^{23} }{6.022*10^{23} } \ mol \ Ag[/tex]
[tex]1.366655596 \ mol \ Ag[/tex]
Convert Moles to Grams
The next step is to convert the moles to grams. This uses the molar mass, which is equivalent to the atomic mass on the Periodic Table, but the units are grams per mole.
Ag: 107.868 g/molLet's make another ratio using this information.
[tex]\frac {107.868 \ g \ Ag}{1 \ mol \ ag}[/tex]
Multiply by the number of moles we calculated.
[tex]1.366655596 \ mol \ Ag*\frac {107.868 \ g \ Ag}{1 \ mol \ ag}[/tex]
The moles of silver cancel out.
[tex]1.366655596 *\frac {107.868 \ g \ Ag}{1 }[/tex]
[tex]1.366655596 * {107.868 \ g \ Ag}[/tex]
[tex]147.4184058 \ g\ Ag[/tex]
Round
The original measurement of atoms has 3 significant figures, so our answer must have the same. For the number we calculated, that is the ones place.
147.4184058The 4 in the tenths place tells us to leave the 7 in the ones place.
[tex]147 \ g\ Ag[/tex]
8.23 ×10²³ silver atoms are equal to approximately 147 grams.
what is elastic energy
Answer:Elastic energy is energy stored in an object for temporary strain. It is basically potential energy.
When a reaction is balanced we know that the number of _______ is the same on both sides of the reaction.
Answer:
Atoms I think
Explanation:
When an equal number of atoms of an element is present on both sides of a chemical equation, the equation is balanced.
Please help me!!!!!!!!! :-]
pls help !! - Using the graph below, what is the rule for a translation form point A to point D?
Answer:
Graph? Question is incomplete.
if the hydrogen ion concentration [H+] in a solution is 1.87 x 10^-11M what is the [OH-]
By using pH formula, the concentration of hydroxyl ion [OH-] will be 5.3 ×[tex]10^{-4}[/tex] M.
What is pH?
The pH scale is a measurement of hydrogen ion concentration that is used to determine the acidity as well as alkalinity of a solution.
Calculation of [OH-] by using formula of pH.
Given data:
[H+] = 1.87 x [tex]10^{-11} M[/tex]
[OH-] = ?
Calculation of [OH-] is shown below:
It can be calculated by using the formula:
pH = -log [H+]
Put the value of concentration of hydrogen ion [H+] in above formula.
pH = -log (1.87 x [tex]10^{-11} M[/tex])
pH = -log (1.87) -log ( [tex]10^{-11} M[/tex])
pH = -0.27 +11
pH = 10.73
Now, use the formula, pH +pOH = 14
pOH = 14 - pH
pOH = 14 - 10.73
pOH = 3.27
Now, use formula pOH = -log [OH-]
[OH-] = [tex]10^{-pOH}[/tex]
[OH-] = [tex]10^{-3.27}[/tex]
[OH-] = 5.3 ×[tex]10^{-4}[/tex] M
Therefore, the concentration of hydroxyl ion [OH-] will be 5.3 ×[tex]10^{-4}[/tex] M.
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Which is the correct result of mitosis and
meiosis?
Answer:
[tex]\boxed {\boxed {\sf B. \ 2 \ diploid \ cells \ and \ 4 \ haploid \ cells}}[/tex]
Explanation:
Mitosis is a type of cell division. It occurs in somatic cells, which are basically any cells other than sex cells. A cell replicates the genetic material then undergoes one division to create 2 identical cells, both with a complete set of chromosomes. These are known as diploid cells.
Meiosis is another type of cell division, but it occurs only in sex cells, called gametes. The cell replicates the genetic material and the chromosomes cross over, which creates completely unique cells. The cell divide to create 2 cells, but then they divide again to create 4 cells. They each have half of the chromosomes of a somatic cell, so they are haploid cells
So, mitosis results in 2 diploid cells and meiosis forms 4 haploid cells.
