Answers
Answer:
C and D
Explanation:
The answer is C and D
Related Questions
Persistent organic pollutants (POPs) should constantly be monitored because they can bioaccumulate in the tissues of organisms.
True False
Answers
Answer:
true
Explanation:
POPs bio-magnify throughout the food chain and bio-accumulate in organisms.
True. Persistent organic pollutants (POPs) are a group of chemicals that are characterized by their resistance to environmental degradation.
These pollutants can persist in the environment for long periods of time and can accumulate in the tissues of living organisms through a process known as bioaccumulation. Bioaccumulation occurs when organisms absorb these pollutants from their surroundings at a rate that exceeds their ability to eliminate them.
POPs are of particular concern because they can have harmful effects on both the environment and human health. As they accumulate in the tissues of organisms, they can disrupt biological processes and lead to a variety of adverse health effects, including developmental, reproductive, and neurological disorders.
Monitoring of POPs is crucial because it helps to assess their levels in the environment and track any potential changes or trends. By monitoring POPs, scientists and policymakers can gain insights into the extent of contamination, identify potential sources of exposure, and make informed decisions about management and regulatory actions. Monitoring efforts may include measuring POP levels in air, water, soil, and biological samples, as well as assessing their impact on different ecosystems and species.
In conclusion, the statement is true. Persistent organic pollutants (POPs) should be constantly monitored due to their potential to bioaccumulate in the tissues of organisms and their associated adverse effects on both the environment and human health.
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1) Alarge doud of dust and gas spread out in a large area is
A) nova B) star
I
B) supernove D) nebula
Answers
Answer:
D. nebula
Explanation:
Hope this helps
<3
What information in a balanced chemical equation shows how many moles of a reactant are involved in the reaction?
Answers
Answer: Coefficients
Explanation: The coefficients in a balanced chemical equation tell you how many moles of reactants you'll require and how many moles of product you'll be able to make.
Answer: The coefficient in front of the molecule tells it’s relative number of moles.
Explanation: Quiz
During photosynthesis, plants produce "food" for themselves. When animals eat plants, they take in energy that originally came from?
A.A seed
B. the soil
C. water
D. the sun
Answers
How would an asthma attack most likely affect oxygen delivery in the body?
Answers
Answer: During an asthma attack, you aren't getting enough oxygen into your lungs. This means less oxygen is getting into your blood and into your muscles. Without oxygen, fatigue sets in.
Given the isotopic symbol below- how many neutrons are present in this
beryllium ion? Answer with just a number*
1 point
9
+2
Be
4.
Answers
Answer:
5 neutrons.
Explanation:
The following data were obtained from the question:
Mass number = 9
Atomic number = 4
Charge = +2
Neutron number =.?
Next, we shall determine the number of protons in the beryllium ion. This can be obtained as follow:
The atomic number is simply the number protons present in the atom. Thus,
Proton = Atomic number
Atomic number = 4
Proton = Atomic number = 4
Finally, we shall determine the Neutron number as follow:
Mass number = 9
Proton number = 4
Neutron number =.?
Mass number = Proton + Neutron
9 = 4 + Neutron
Collect like terms
Neutron = 9 – 4
Neutron = 5
Thus, there are 5 neutrons b present in the beryllium ion.
How many moles of aluminum ions al3+ are present in 0.42 mol of al2so43
Answers
There are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.
To determine the number of moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3, we need to consider the stoichiometry of the compound.
The formula of aluminum sulfate (Al2(SO4)3) indicates that for every 1 mole of the compound, there are 2 moles of aluminum ions (Al3+). This means that the mole ratio of Al3+ to Al2(SO4)3 is 2:1.
Given that we have 0.42 mol of Al2(SO4)3, we can calculate the moles of Al3+ as follows:
Moles of Al3+ = 0.42 mol Al2(SO4)3 x (2 mol Al3+ / 1 mol Al2(SO4)3)
Moles of Al3+ = 0.42 mol Al2(SO4)3 x 2
Moles of Al3+ = 0.84 mol Al3+
Therefore, there are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.
It's important to note that the stoichiometry of the compound determines the mole ratio between the different species involved in the chemical formula. In this case, the 2:1 ratio of Al3+ to Al2(SO4)3 allows us to determine the number of moles of Al3+ based on the given amount of Al2(SO4)3.
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If 40g KCI are dissolved in 100g of water at 20 degrees C, what type of solution does
it form?
Answers
Answer:
neutral
Explanation:
dss
According to the Clausius theorem, the cyclic integral of
for a reversible cycle is zero.
Answers
Answer:
Yes it is true
Explanation:
This is because the Clausius theorem states that The cyclic integral always has two defined results. The results include it being less than or equal to zero under certain conditions.
When the system consists of only reversible processes, the cyclic integral is equal to zero. If it consists of and irreversible processes, the integral is usually less than zero.
How many molecules would 3.45 moles of methane (CH4)
Answers
(Btw this is an example on how to solve it so just letting you know)
To answer this question, you must understand how to convert grams of a molecule into the number of molecules. To do this, you have to utilize the concepts of moles and molar mass.
A mole is just a unit of measurement. Avogadro's number is equal to
6.022
⋅
10
23
molecules/mole. This number is the number of molecules of a specific compound in which when you multiply the compound by it, it converts atomic mass into grams.
For example, one mole of hydrogen gas (
H
2
) or
6.022
⋅
10
23
molecules of
H
2
weighs 2.016 grams because one molecule of
H
2
has an atomic weight of 2.016.
So the overall solution for this problem is to use molar mass of
C
H
4
(methane) to convert grams of methane into moles of methane. Then, use Avogadro's number to convert moles of methane into molecules of methane.
One mole of methane equals 16.04 grams because a molecule of methane has an atomic weight of 16.04. The conversion factor will be 16.04 grams/mole.
48
g
C
H
4
⋅
1
m
o
l
C
H
4
16.04
g
C
H
4
⋅
6.022
⋅
10
23
m
c
l
s
C
H
4
1
m
o
l
C
H
4
When you multiple and divide everything out, you get
1.8021
⋅
10
24
molecules of
C
H
4
Notice this is a modified T-chart so the grams
C
H
4
cancels out when you do the first conversion, and the moles
C
H
4
cancels out when you do the second conversion. This leaves you with the unit molecules of
C
H
4
which corresponds to what the question asks.
This is something else and is not connected with the one above this comment.
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles CH4, or 16.04246 grams.
Or
Therefore 3.4 grams of ammonia is equal to 0.1996359579590159 moles of ammonia. Multiplying this by 6.022 * 1023 we get 120220773882919374980000 molecules (or 1.2022 * 1023 molecules). ...
3.45 moles of methane(CH4) have 20.7759×10^{23} molecules.
What is Avogadro's number?Avogadro's number is the number of atoms, molecules, or groups of ions that are present in one mole of a substance. The value of Avogadro's number is 6.022×10^{23}.
Avogadro's number is one of the basic and fundamental concepts of chemistry.It allows us to analyze the different atoms, molecules, and ionic groups. Comparison between molecules and atoms can be performed using Avogadro's number.1 mole of CH4= 6.022×10^23 molecules of CH4
Hence, 3.45 moles of CH4= 3.45×6.022×10^23
Answer: 20.7759×10^23 molecules of CH4 in 3.45 moles of CH4.
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What is the final temperature after 840 Joules is absorbed by 10.0g of water at 25.0
C?
Answers
The final temperature of the water is: T_final = 45.0°C
We can use the formula for the specific heat capacity of the water to solve this problem:
q = mcΔT
First, we can calculate the initial energy of the water:
q = mcΔT
q = (10.0 g) (4.184 J/g°C) (25.0°C)
q = 1,046 J
Next, we can calculate the final temperature after absorbing 840 J:
q = mcΔT
840 J = (10.0 g) (4.184 J/g°C) (ΔT)
ΔT = 20.0°C
Therefore, the final temperature of the water is:
T_final = T_initial + ΔT
T_final = 25.0°C + 20.0°C
T_final = 45.0°C
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Matter is anything the has mass and occupies space. True or False
Answers
Answer:
It's True.
Explanation:
Matter is anything that has mass and takes up space. Mass gives an object the property of weight and inertia (resistance to change in the motion of an object). There are four states of matter, solid, liquid, gas, and plasma.
Which best explains why children often look like their parents? A) Traits, or characteristics, are passed on to offspring from parents. B) Before being born, characteristics of offspring are randomly formed. C) Babies begin to look like their parents as their features start to mature. D) Babies form physical features similar to people they are around most often.
Answers
The answer is A, Those traits and charectaristic are inheirted or in other words passed on.
which gas is fossil fuel
Answers
Answer:
methane
Explanation: methane is obtained from the decaying of flora and fauna mostlyunder damp
The metric system is only used in France? True or false
Answers
Answer:
false
Explanation:
The metric system is used in all but 3 countries in the world
What information do the reduction potentials of two elements give about a
redox reaction between those elements?
A. Which element will be oxidized and which will be reduced
B. The electronegativity difference between the two elements
C. Whether electrons will be gained or lost by the oxidized atom
D. Which element is more commonly found in nature
Answers
The information that the reduction potentials of two elements give about a redox reaction between those elements is which element will be oxidized and which will be reduced. The correct option is A.
What is a redox reaction?Redox reactions include a change in the oxidation state of the substrate. Loss of electrons or a rise in an element's oxidation state is considered to be oxidation.
Gaining electrons or lowering an object's or its atoms' oxidation state are both considered reductions. A chemical reaction known as an oxidation-reduction (redox) reaction includes the exchange of electrons between two substances.
The reduction potential tells about the element that will be oxidized ad which will be reduced in the redox reaction.
Thus, the correct option is A. Which element will be oxidized and which will be reduced.
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Answer:
Option (A)
Which element will be oxidized and which will be reduced
Explanation:
Hopes this helps.
What mass of sugar C12H22O11 is required to provide 2.50 x 1023 molecules of O2?
Answers
Answer:
342.29648 g/mol
Explanation:
Mass of sugar C₁₂H₂₂O₁₁ is required to provide 2.50 x 10²³ molecules of O₂ is 11.84.
What is mole concept?Avogadro's number is the number of units in one mole of any substance and equals to 6.02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.
No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.
Mass of a particular product is also find out by stoichiometry of a reaction as per the no. of mole given in the reaction.
Reaction is-
C₁₂H₂₂O₁₁ + 12O₂ → 12CO₂ + 11H₂O
1 mole of C₁₂H₂₂O₁₁ forms 12 moles of O₂.
12 × 6.02214076 × 10²³ molecules of O₂ formed by 342.3 g of C₁₂H₂₂O₁₁.
1 molecule of O₂ formed by 4.73 × 10⁻²³ g of C₁₂H₂₂O₁₁.
2.50 × 10²³ molecules of O₂ formed by 11.84 g of C₁₂H₂₂O₁₁.
Therefore, Mass of sugar C₁₂H₂₂O₁₁ is required to provide 2.50 x 10²³ molecules of O₂ is 11.84.
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1.40 g H2 is allowed to react with 9.66 g N2, producing 2.24 g NH3
.
What is the theoretical yield in grams for this reaction under the given conditions?
Answers
The theoretical yield of NH₃ produced under the given conditions is 11.75 g.
The balanced equation for the reaction between hydrogen (H₂) and nitrogen (N₂) to form ammonia (NH₃) is;
N₂ + 3H₂ → 2NH₃
To determine the theoretical yield of NH₃ produced from the given amounts of H₂ and N₂, we need to calculate the limiting reactant and then use stoichiometry to find the maximum amount of NH₃ which can be produced.
The molar masses of H₂, N₂, as well as NH₃ are;
H₂; 2.02 g/mol
N₂; 28.02 g/mol
NH₃; 17.03 g/mol
The number of the moles of each reactant will be calculated as;
moles of H₂ = mass of H₂ / molar mass of H₂ = 1.40 g / 2.02 g/mol = 0.693 mol
moles of N₂ = mass of N₂ / molar mass of N₂ = 9.66 g / 28.02 g/mol = 0.345 mol
To determine the limiting reactant, we need to compare the mole ratios of H₂ and N₂ in the balanced equation with the actual mole ratios of the reactants. The balanced equation shows that 1 mole of N₂ will reacts with 3 moles of H₂ to produce a 2 moles of NH₃. The actual mole ratio of N₂ to H₂ in the reaction mixture is;
moles of N₂ / moles of H₂ = 0.345 mol / 0.693 mol
= 0.498
This ratio is less than the required ratio of 1/3, which means that N₂ is the limiting reactant. This means that all the N₂ will be consumed in the reaction and the amount of NH₃ produced will depend on the amount of N₂ present.
Using the mole ratio from the balanced equation, we can calculate the theoretical yield of NH₃ that can be produced from the 0.345 mol of N₂;
moles of NH₃ = (0.345 mol N₂) × (2 mol NH3 / 1 mol N₂)
= 0.690 mol NH₃
The mass of this amount of NH₃ can be calculated as;
mass of NH₃ = moles of NH₃ × molar mass of NH₃ = 0.690 mol × 17.03 g/mol = 11.75 g
Therefore, the theoretical yield is 11.75 g.
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Considering the patterns you have noticed in this activity, which statement best explains why a compound with the molecular formula CH3 doesn't exist in nature?
A. Hydrogen typically needs four bonds to reach a noble gas configuration.
B. Carbon needs more than just three bonds to reach a noble gas configuration. C. The chemical CH3 does not react with other substances because of its high stability.
D. CH3 has three double bonds, which fails to give it a noble gas configuration
Answers
Answer:
The answer is B
Explanation:
I had the same question and I chose B and it was correct.
Answer:
B. Carbon needs more than just three bonds to reach a noble gas
Explanation:
PLATO ANSWER
PLATO EXPLANATION-
Each hydrogen atom can make only one bond, but a carbon atom needs four bonds to be stable. Therefore, three hydrogen atoms are not enough for the carbon atom to make four bonds.
Given the following conversion, how many pounds are in 600 grams? Show your work to receive full credit.
1 pound = 16 oz
1 oz = 28.3 grams
Answers
Answer:
1.32 pounds
Explanation:
28.3 times 16 is 452.8. 600 divided by 452.8 is 1.32
To solve this, we must be knowing each and every concept related to unit conversion and its calculations. Therefore, Therefore, 1.325pounds are in 600 grams are in 1 meter.
What is unit conversion?Many times in mathematics and science conventional measuring units must be converted into alternative measurement units. This is referred to as unit conversion. It is occasionally more important when resolving a situation. To finish the computations, mathematical conversions are employed.
Assume the length and breadth of a rectangle are given in centimeters and metre, respectively. The area in sq m may then be calculated by converting cm into metre units. As a result, the idea and technique of unit conversion must be understood.
Mathematically,
1 pound = 16 oz, 1oz=1/16pound
1 oz = 28.3 grams, 1g=1/28.3 oz
600 grams×1/28.3 oz×1/16pound=600/452.8=1.325pound
600 grams=1.325pound
Therefore, 1.325pounds are in 600 grams.
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6. How many moles are in 8.30 x 1023 molecules of CO₂?
a.
b.
C.
d.
1.37
2.8
55.5
100
Answers
Someone please help me please
Answers
Answer:
point 2 and 4
Explanation:
because at those point temperature is constant
Please help me asap
(Do not balance the equation)
Answers
Explanation:
decrease T = eq shifts left, because youre taking energy from the system and this is an endothermic reaction, it needs energy to make products = co2 concentration decreases
add CO = eq shifts right, because you're adding reactants in the equilibrium = i2o5 concentration decreases
increase i2o5 = same = can't affect T
decrease co2 = eq shifts right, because by
decreasing co2 you'll have less of this product than you normally have in the equilibrium, then eq will shift toward making more product = both reactants, CO and I2O5 decrease their concentration because they're being used to shift equilibrium right
3. If an item of trash is described as highly biodegradable, is that a physical property or
chemical property?.
Answers
What is the mole concept, and how is it used to quantify the amount of a substance in a chemical reaction?
Answers
Answer:
Avogadro's number of particles
Explanation:
Answer:
The mole concept is a unit of measurement used in chemistry to quantify the amount of a substance in a chemical reaction. It is defined as the number of particles of a substance that contains Avogadro's number of particles. The mole is used to determine the number of moles of reactants and products in a chemical reaction, and to calculate the amount of energy transferred or produced during the reaction.
Explanation:
Identify any formal charges that are missing from the structures of 1 and 2 [HINT: You should add all missing valence electrons first].
Answers
These are the formal charges for compounds 1 and 2:
1 | N = 0, O = -1, Cl = -12 | N = +1, O = -1, C = 0How to determine formal charges?The formal charge of an atom is the charge that an atom would have if all of the electrons in a bond were shared equally. To calculate the formal charge of an atom, use the following formula:
formal charge = valence electrons - (bond electrons / 2) - non-bonding electrons
In compound 1, the nitrogen atom has 5 valence electrons, 3 bond electrons (one from each of the two C-N bonds), and 0 non-bonding electrons. Therefore, the formal charge on the nitrogen atom is 0.
The oxygen atom in compound 1 has 6 valence electrons, 2 bond electrons (one from each of the two C-O bonds), and 4 non-bonding electrons. Therefore, the formal charge on the oxygen atom is -1.
The chlorine atom in compound 1 has 7 valence electrons, 1 bond electron (from the C-Cl bond), and 6 non-bonding electrons. Therefore, the formal charge on the chlorine atom is -1.
In compound 2, the nitrogen atom has 5 valence electrons, 1 bond electron (from the N-O bond), and 4 non-bonding electrons. Therefore, the formal charge on the nitrogen atom is +1.
The oxygen atom in compound 2 has 6 valence electrons, 2 bond electrons (one from the N-O bond and one from the C=O bond), and 0 non-bonding electrons. Therefore, the formal charge on the oxygen atom is -1.
The carbon atoms in both compounds have 4 valence electrons, 4 bond electrons, and 0 non-bonding electrons. Therefore, the formal charge on the carbon atoms is 0.
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The pOH of a solution is 6.0. Which statement is correct?
Use pOH = -log[OH-] and PH+pOH = 14.
The pH of the solution is 20.0.
O The concentration of OH ions is 1.0 x 108 M.
The concentration of OH ions is 1.0 x 106 M.
O The pH of the solution is 8.0.
A
Answers
At pOH value of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)
In this question we will apply the formula
pH +pOH = 14 . . . . . . . . . . . . .(1)
where pH = concentration of [\(H^{+}\) ] ion
pOH = concentration of [\(OH^{-}\) ] ion
As per the question
pOH =6.0
Putting the value of pOH in equation (1) we get the value of pH
pH + 6.0 =14
pH = 14 -6.0
pH = 8.0
The value of pH if the pOH value is 6.0 is 8.0
To find the concentration of \(H^{+}\) ion we will use the following formula
This is calculated by the formula
[\(H^{+}\)} = \(10^{-pH}\)
where we will write the values of pH
Hence the concentration of [\(H^{+}\)} ion is \(10^{-8}\)
Therefore at pOH of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)
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The complete question is -
What is the pH value and concentration of [\(H^{+}\) ] ion of the following if the pOH value of the solution is 6.0 ?
how does soil erosion affect living things
Answers
The effects of soil erosion go beyond the loss of fertile land. It has led to increased pollution and sedimentation in streams and rivers, clogging these waterways and causing declines in fish and other species. And degraded lands are also often less able to hold onto water, which can worsen flooding.
What is the first quantum number of a 1 s² electron in phosphorus,
1s²2s²2p 3s²3p³?
A. n = 1
B. n = 2
C. n = 3
D. n = 0
Answers
The first quantum number, that is, the principal quantum number of a 1s² electrons is n= 1. Hence, option A is correct.
What is quantum number?Quantum numbers of an electrons represents the allocation of electrons in each orbitals within an atom. There are four different quantum numbers namely, principal quantum number, azimuthal quantum number, magnetic quantum number and spin quantum number.
No two electrons in an orbital will have same set of these four quantum numbers. The principal quantum number corresponds to the main energy levels represented by the letter n.
n for 1s orbital is always 1. Similarly for a 3s orbital n is 3. Therefore, the principal quantum number of one electron in 1s is n=1.
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Whats the atomic radius of tin (Sn)
Answers
Explanation:
the atomic radius of ( Sn) is 225pm