Explanation:
pH= –log¹⁰[H+]
0.50= –log¹⁰[H+]
log¹⁰[H+]=0.50
take the antilog of 0.50
[H+]= 3.16moldm-³
The half-life of carbon-14 is approximately 5700 years. An archaeologist unearths a piece of wood that is determined to
have 83% of its carbon-14 remaining. Using carbon-12 dating techniques, approximately how old is the ancient piece of
wood that she located?
The age of the ancient piece of wood that she located given the data is 1482 years
How to determine the number of half-lives
Original amount (N₀) = 100%
Amount remaining (N) = 83%
Number of half-lives (n) =?
2ⁿ = N₀ / N
2ⁿ = 100 / 83
2ⁿ = 1.2
Take the Log of both side
Log 2ⁿ = Log 1.2
nLog 2 = Log 1.2
Divide both side by Log 2
n = Log 1.2 / Log 2
n = 0.26
How to determine the age
Number of half-lives (n) = 0.26
Half-life (t½) = 5700 years
Time (t) =?
t = n × t½
t = 0.26 × 5700
t = 1482 years
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Sample Response: Forces are either positive or negative vectors, depending on the direction in which the force is acting. The net force is the sum of all of the forces acting on an object. If the children pull on the toy with the same force in opposite directions, the forces will be perfectly balanced and cancel out, leaving a net force of zero.
What did you include in your response? Check all that apply.
Forces are vectors.
Forces can be positive or negative.
The forces exerted by the children are in balance.
The net force is the sum of all of the forces that canceled out to zero.
The net force is the sum of all of the forces that cancelled out to zero. Hence, option D is correct.
What is force?The pushes or pulls on an object with mass causes it to change its velocity.
The net force is the vector sum of all forces acting on an object. Force is a vector quantity.
Two forces of equal magnitude when acting on an object in opposite directions will cancel out each other.
As a result net force is equal to 0. The word net here shows the total force acting on the object.
Hence, option D is correct.
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What is force?
The pushes or pulls on an object with mass causes it to change its velocity.The net force is the vector sum of all forces acting on an object. Force is a vector quantity. Two forces of equal magnitude when acting on an object in opposite directions will cancel out each other. As a result net force is equal to 0. The word net here shows the total force acting on the object.Hence, option D is correct.
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a student used a vernier magnetic field sensor to measure the strength of the magnetic field generated by a bar magnet. at which position is the
strength of the magnetic field strongest point a or point b?
The position is the strength of the magnetic field strongest is is the place where the magnetic field leaves, being point A.
What generates a magnetic field?When an electrically charged particle moves, it creates a magnetic field. According to the laws of electromagnetism, this magnetic field originates from the variation of the electric field strength.
In the region of the poles we see that the lines of magnetic induction are closer to each other, therefore, we consider that close to the poles the magnetic field is more intense.
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In this experiment, simple chemical reactions are used to generate small quantities of hydrogen and
oxygen gases. These methods would be too expensive and too complicated if large quantities of these
gases were needed, however. Use your textbook, a chemical encyclopedia, or an online source to look
up the major industrial methods of preparing very large quantities of these gases. Summarize your
findings here.
One of the industrial method for the production of hydrogen is the steam reforming process while oxygen is air separation.
Industrial method of hydrogen preparation
One of the industrial method for the production of hydrogen is the steam reforming process also known catalytic steam–hydrocarbon process.
In catalytic steam–hydrocarbon process, gaseous or vaporized hydrocarbons are treated with steam at high pressure over a nickel catalyst at 650°–950° C to produce carbon oxides and hydrogen.
Industrial method of oxygen preparationOne of the industrial method of oxygen production is the separation of air using either a cryogenic distillation process or a vacuum swing adsorption process.
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The rocks that make up the crust are relatively cold and ?
Answer:
brittle
Explanation:
The elaboration likelihood model emphasizes the use of __________ persuasion and __________ persuasion methods. a. direct . . . elaborative b. peripheral . . . elaborative c. direct . . . peripheral d. indirect . . . direct
The elaboration likelihood model emphasizes the use of direct persuasion and peripheral persuasion methods.
What is direct persuasion and peripheral persuasion?
This theory involves a dual process which explains how attitudes are changed in individuals through persuasion.
These methods help in the formation of attitude which makes, in this case, option use of direct persuasion and peripheral persuasion.
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Answer:
C. direct . . . peripheral
Explanation:
Because I said so.
how many moles of pb(NO3)2 are needed to react with 4.8 moles of Al
groundwater is an important resource for all life on earth. as you have read, water levels in the ogallala aquifer are decreasing. one proposed
strategy mentioned in the article is to dig deeper wells. do you agree or disagree with this strategy? use evidence and scientific reasoning to
support your position
Digging of wells being able to increase aquifer is something I agree with.
What is an Aquifer?
This is a water permeable rock layer which is found in the underground layer of the earth.
Wells will ensure water seeps into these layers thereby bringing about an increase in the aquifer.
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In the diagram, Electrons flow from the right half-cell to the left one through the wire, which statement is true?
The metal strip on the left has a lower activity than on the right
The metal strip on the right has a lower activity than the on on the left
The activities of both metals strips are equal
Answer:
The metal strip on the left has a lower activity than the one on the right.
(Took the exam)
If ba+2 will reacts with n-3, the formula of the compound formed is:
a. ban3
b. ba2n3
c. ban
d. ba3n2
If [tex]Ba^{+2}[/tex] will reacts with [tex]N^{-3}[/tex], the formula of the compound formed is [tex]Ba_3N_2[/tex].
What is an ionic compound?Ionic compounds are neutral compounds made up of positively charged ions called cations and negatively charged ions called anions.
Barium is a metal element and Nitrogen is a non-metal element, so they form an ionic compound. To make the formula of an ionic compound, first, we need to see the valence of the atoms, that is, how many electrons it can donate or it has to gain to have 8 electrons in the valence layer (octet rule).
Barium is in family 2, so it has two electrons in its valence layer, so it must donate these two electrons; Nitrogen is in family 15, so it has 5 electrons ins its valence layer and must gain 3 electrons.
Writing the ions they must form:
[tex]Ba^{+2}N^{-3}[/tex]
First came the cation (positive charge), then the anion (negative charge), and the charges must change between them, without the signal, and will inform how many atoms are necessary for which element:
[tex]Ba_3N_2[/tex]
Hence, If [tex]Ba^{+2}[/tex] will reacts with [tex]N^{-3}[/tex], the formula of the compound formed is [tex]Ba_3N_2[/tex].
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Based on Figure 2, which statement best describes what happens to the amount of matter in the reaction?
A. There are 54 atoms in the reactants and 54 atoms in the products.
B. There are 15 reactants molecules that become the 15 product atoms.
C. The 15 reactants molecules are destroyed to produce energy in the form of energy
D. The fuel molecule is broken in half and each half makes molecules of water and carbon dioxide as products.
Answer:15 +18
Explanation:15 fuel +18 oxygen + 33 cd
Help!! fast pls. what is the second quantum number for one of the electrons in the 4p energy sub level of bromine
The second quantum number for one of the electrons in the 4p energy sub level of bromine is l = 1 .
What are Quantum Numbers ?Those set of numbers which describe the energy level and position of an electron are called Quantum Numbers.
There are 4 types of quantum numbers :
Principle Quantum Numbers
Azimuthal Quantum Number
Magnetic Quantum Number
Spin Quantum number
the bromine atom the one electron in 4p energy sublevel,
it is in 4rd shell , n= 4 ,
it is in 'p' orbital l = 1
therefore value of m = -1 , 0, 1
[tex]\rm m_s[/tex] = +1/2 or -1/2
The second quantum number for one of the electrons in the 4p energy sub level of bromine is l = 1 .
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An atom has eight protons and nine neutrons. draw the atomic structure of the atom
An atom has eight protons and nine neutrons. The atomic structure of the atom is attached below in image.
What is an atomic structure ?The term "atomic structure" describes the structure of an atom, which has a nucleus that contains both protons and neutrons . The centre of the nucleus is circled by the negatively charged electrons.
The smallest piece of ordinary matter within an element is called an atom. Protons, neutrons, and electrons are the three subatomic particle types that make up an atom.
An isotope's number is equal to the sum of its protons plus neutrons since their masses are almost identical. Oxygen 16 therefore has 8 protons and 8 neutrons, followed by oxygen 17 with 8 protons and 9 neutrons, and oxygen 18 with 8 protons and 10 neutrons.
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Which electrochemical cell does the illustration depict
Answer:
This depicts an electrolytic cell.
When adding sugar to tea, it was observed that the sugar kept dissolving. After a
minute, all of the sugar was completely dissolved, as no extra particles can be
added and be seen floating around. The mixture is then considered to be
Answer: When adding sugar to tea, it was observed that the sugar kept dissolving. After a minute, all of the sugar was completely dissolved, as no extra particles can be added and be seen floating around. The mixture is then considered to be
Explanation:
The molecule of mixture cannot be seen hence, it will be considered as homogeneous mixture.
What is molecule?
A molecule is just a collection of more than two atoms bound together by chemical bonds; depending on the context, the phrase doesn't have to include ions that meet this requirement.
What is homogeneous mixture?Solids, liquids, as well as gases, can all be homogeneous mixtures. Through, they have almost the same look and chemical makeup.
When sugar will be dissolved, the sucrose molecules get separated from one another. The materials that make up individual molecules stay together like sucrose molecules sucrose molecules, so the molecule will not break up.
Therefore mixture can be considered as molecule and homogeneous mixture.
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How long does it take for dental stitches to dissolve.
The electrons that are in the outermost electron shell, also known as the ____________ , have ____________ energy than those in the inner electron shells.
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. The outermost electrons are called valence electrons and its energy is higher than the core electrons.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.
The electrons that are in the outermost electron shell, also known as the valence electrons, have higher energy than those in the inner electron shells.
Therefore, the outermost electrons are called valence electrons and its energy is higher than the core electrons.
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In the chemical equation below, name the reactant(s) and product(s).
CH4 (g) + O2 (g) → CO2 (g) + H₂O (g)
Answer:Methane(CH4) and dioxygen(O2) are the reactants
Carbon dioxide(CO2) and water(H2O) are the products
Explanation:
Activity 1: "PEA-ce of Cake"
OBJECTIVE: Identify the genotypic and phenotypic ratios of offspring in the standard monohybrid cross.
Parent 1: _______________
Garden pea plant with homozygous gene pair for round seed
Garden pea plant with homozygous gene pair for wrinkled seed
Genotype (Parent 1): _______________
RR
rr
Parent 2: _______________
Garden pea plant with homozygous gene pair for round seed
Garden pea plant with heterozygous gene pair for round seed
Genotype (Parent 2): _______________
RR
Rr
The genotype and phenotype ratio for the first cross will be 100% Rr and 100% round seeded while that of the second cross will be 1RR:1Rr and 50/50 round/wrinkle seeded offspring respectively.
Genotype and phenotype ratioFor the first cross:
RR x rr
Rr Rr Rr Rr
Genotype ratio: 100% Rr
Phenotype ratio - 100% round seeded
For the second cross:
RR x Rr
RR Rr RR Rr
Genotype ratio: 1RR:1Rr
Phenotype ratio = 50% round seeded and 50% wrinkle seeded.
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Based on Charles's law, which of the following statements is true for an ideal gas at a constant pressure and mole amount?
The number of collisions is independent of volume.
The number of collisions decreases with increase in volume.
Volume is directly proportional to absolute temperature.
Volume is inversely proportional to absolute temperature.
Answer:
the number of collisions is independent of Volume.
Based on Charles's law, an ideal gas at a constant pressure and mole amount is " the number of collisions is independent of volume."
What is Charles's law?Gases have a propensity to expand while heated, according to Charles' law, an innovative gas law.
What is collisions?A collision would be any situation in where two or even more bodies quickly number of factors on one another.
Based on Charles's law, an ideal gas at a constant pressure and mole amount is " the number of collisions is independent of volume."
Therefore, the correct answer will be option (A).
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Select the atoms that belong to the same element.
16 protons 16 neutrons 16 electrons
11 protons 10 neutrons 11 electrons 13 protons 14 neutrons 13 electrons. 14 protons 14 neutrons 14 electrons. 11 protons 12 neutrons 11 electrons
Explanation:
please structure your question correctly so that we can answer.
Answer:
Cant answer until its wrote correctly
Explanation:
Because its not stated properly
1. Which term identifies a factor that will shift a
chemical equilibrium?
A) atomic radius
B) catalyst
C) decay mode
D) temperature
Answer:
D) Temperature,
Explanation:
Type the correct answer in each box. express your answer to two significant figures. you form water vapor by mixing oxygen and hydrogen at 730°c in a 5.4-liter container. this is the equation for the reaction: o2(g) 2h2(g) → 2h2o(g). the partial pressure of oxygen before the reaction is 122.3 kilopascals, and there is excess hydrogen. how many moles of water are formed? the reaction produces moles of water.
The number of moles of water vapor formed in the reaction is 0.158 moles
What is the ideal gas equation?The ideal gas equation shows the relationship between number of moles, temperature, volume and pressure.
Now;
P = 122.3 kilopascals or 1.21 atm
V = 5.4 L
T = 730°c or 1003 K
n = ?
R = 0.082 atmLK-1mol-1
PV = nRT
n = PV/RT
n = 1.21 * 5.4/0.082 * 1003
n = 6.53/82.2
n = 0.079 moles
The equation of the reaction is; O2 (g) + 2H2(g) ---->2H2O(g)
If 1 mole of O2 formed 2 moles of H2O
0.079 moles of O2 yield x moles of H2O
x = 0.079 * 2/1
= 0.158 moles
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Calculate the volume of an
object with the following
dimensions:
4 cm x 15 cm x 5 cm
Answer:
300cm³
Explanation:
volume=l×b×h
4cm×15cm×5cm
=300cm³
How many grams are in 4.5 moles of NaF?
Answer:
3139542g
Explanation:
That's because if you talk about
4.5
moles of sodium fluoride, you would get a really absurd number of grams.
How much mass does 6 moles of K have?
Answer:
234.6
Explanation:
CH3NH₂ + H2O → what is this equal
The balanced equation is CH₃NH₂ + H₂O → CH₃NH + H₃O.
What is a chemical reaction?A chemical reaction is a reaction involves two or more reactants that reacts to form products.
When methyl amine reacts with water, then methyl amino and hydronium ion are formed.
Thus, the product of the reaction is CH₃NH₂ + H₂O → CH₃NH + H₃O.
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What is the heat abosorbed by 47.5g of silver (Ag) when the temperature rises by 10.0C?
The heat absorbed by 47.5g of silver (Ag) when the temperature rises by 10 °C is 111.625 J .
What is Specific Heat ?Specific heat, the quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree.
The units of specific heat are usually calories or joules per gram per Celsius degree.
The equation used to solve for specific heat capacity is this:
q = mcΔT
where q heat absorbed or lost,
c is the specific heat capacity,
m is the mass, and
ΔT is the change in temperature
= final temperature− initial temperature
Given that m = 47.5g
ΔT = 10 K
Specific Heat of silver = 0.235 J/gK
Therefore
q = 47.5 * 0.235 * 10
q= 111.625 J
Therefore the heat absorbed by 47.5g of silver (Ag) when the temperature rises by 10 °C is 111.625 J .
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Below is the thermochemical equation for the combustion of octane.
SC8H18(l) + 25O2(g) ⇒ 16CO2 (g) + 18H2O(l), ΔH= -10,941kj
How much heat is released during the combustion of 4 moles of octane (C8H18)
Question 5 options:
-21,882 kJ
-175,056 kJ
-2,735 kJ
-10,941 kJ
Impossible to answer this question with the information provided
-5,470.5 kJ
5mol produces -10.941KJ
4 mol let produces x KJ
Solve through proportion
5/-10.941=4/x5x=-43.764x=-43.764/5x=8.756 KJ5moles of octane produces -10941KJ
1mol of octane produces 2188KJ
4mol of octane produces
2188(4)8756KJNEED ASAP PLS WILL AWARD BRAINLIEST
The table compares some characteristics of two atoms.
Charged Particles
Atom Number of Neutrons Mass Number
X 6 12
Y 7 13
Use the table to determine the number of protons for each atom. Then, choose the statement below that is true about the two atoms.
Atom X and Atom Y are in the same row, but not the same family, on the periodic table.
Atoms X and Atom Y are in the same family, but not the same row, in the periodic table.
Atom X is in a column to the right of Atom Y in the periodic table.
Atom X and Atom Y occupy the same position in the periodic table because they are isotopes.
Answer:
proton number for element X is 6
while proton number for element Y is 7
X and Y are in the same row but not the same family on the periodic table cause element X belongs to group 6 also known as carbon family while Y belongs to group 7 also known as nitrogen family