Answer:
Points of acceleration:
1. When female bear goes quickly
2. After becoming tired, when she becomes slow
3. When she changes direction from east to north
4.When she slows down when she reaches the river bed
5. When she turns around
6.When she increases speed to travel southwest to return home
7. When she comes to a stop at home
Explanation:
1. When she is going quickly she is increasing her velocity thus positively accelerating
2. When she becomes slow, she is having negative acceleration.
3. When there is a change in direction of velocity there is an acceleration.
4. Again negative acceleration when she comes to a stop at the river bed
5. Turning around to the southwest direction requires acceleration
6. To increase the velocity to reach home, positive acceleration
7. To decrease the velocity to stop upon reaching home, negative acceleration
What is the frequency in Hz of blue light having a wavelength of 440nm?
Answer:
Blue: 440 nm; 6.81 × 1014 Hz; 4.51 × 10−19 J.
Explanation:
I know
The frequency of blue light with a wavelength of 440nm is calculated using the speed of light and the wavelength, resulting in a frequency of approximately 6.818 imes 10¹⁴ Hz.
The frequency of blue light with a wavelength of 440nm can be calculated using the speed of light and the formula for frequency, which is frequency (f) = speed of light (c) / wavelength ( ambda). Given that the speed of light (c) is 3.00 imes 10^8 ms⁻¹, and the wavelength ( ambda) of blue light is 440nm (which is 440 imes 10⁻⁹m when converted to meters), we can calculate the frequency as follows:
f = c / ambda
f = (3.00 imes 10^8 ms⁻¹, / (440 imes 10⁻⁹ m)
After performing the calculation:
f = 6.818 imes10¹⁴Hz
Therefore, the frequency of blue light with a wavelength of 440nm is approximately 6.818 imes 10¹⁴ Hz.
Half of a sample of cobalt-60 decays after 5.26 years to form atoms of another element. Half of a sample of iodine-131 decays after 8.1 days to form atoms of another element. Which best explains this difference? 1Choice 1 Iodine-131 has a smaller atomic number than cobalt-60. 2Choice 2 Iodine-131 has a shorter half-life than cobalt-60. 3Choice 3 Iodine-131 has a smaller atomic mass than cobalt-60. 4Choice 4 Iodine-131 has half the radioactive energy of cobalt-60.
Iodine-131 has a shorter half-life than cobalt-60.
Explanation:We are given;
Half of a cobalt-60 sample decays after 5.26 years Half of an Iodine-131 sample decays after 8.1 daysWe are supposed to explain the difference between the two instances;
We need to define half life;
Half life is the time half of a given sample takes to decay leaving the other half of it.Therefore;If half of a cobalt-60 sample decays after 5.26 years then the half life of cobalt-60 is 5.26 years.On the other hand, if half of an Iodine-131 sample decays after 8.1 days, then the half life of Iodine-131 is 8.1 days.We can therefore, conclude that, Iodine-131 has a shorter half-life than cobalt-60.Number 9.56 questions, a, b , c
Answer:
Explanation:
Chemical equation;
2C₁₀H₂₂ + 31O₂ → 20CO₂ + 22H₂O
a) how many moles of O₂ are needed to completely react with 1.0 mole of C₁₀H₂₂?
Given data:
Moles of C₁₀H₂₂ = 1.0 mol
Moles of O₂ needed = ?
Solution:
we will compare the moles of C₁₀H₂₂ with O₂.
C₁₀H₂₂ : O₂
2 : 31
1.0 : 31/2×1.0 = 15.5 mol
So 15.5 moles of oxygen are needed to react with 1.0 moles of C₁₀H₂₂ .
B) if a car produces 44 g of CO₂, how many grams of C₁₀H₂₂ are used up in the reaction?
Given data:
Mass of CO₂ = 44 g
Mass of C₁₀H₂₂ = ?
Solution:
Number of moles of CO₂:
Number of moles = mass/ molar mass
Number of moles = 44 g/ 44 g/mol
Number of moles = 1 mol
Now we will compare the moles of CO₂ with C₁₀H₂₂.
CO₂ : C₁₀H₂₂
20 : 2
1 : 2/20×1 = 0.1 mol
Mass of C₁₀H₂₂:
Mass = number of moles × molar mass
Mass = 0.1 mol × 142.3 g/mol
Mass = 14.23 g
14.23 g of C₁₀H₂₂ are used up in this reaction.
c) if you add 28.8 g of C₁₀H₂₂ to your fuel, how many moles of O₂ are used up in the reaction?
Given data:
Mass of C₁₀H₂₂ = 28.8 g
Moles of oxygen used = ?
Solution:
Number of moles of C₁₀H₂₂ = mass/ molar mass
Number of moles of C₁₀H₂₂ = 28.8 g /142.3 g/mol
Number of moles of C₁₀H₂₂ = 0.20 mol
Now we will compare the moles of C₁₀H₂₂ with oxygen.
C₁₀H₂₂ : O₂
2 : 31
0.20 : 31/2×0.20 = 3.1 mol
By adding 28.8 g of C₁₀H₂₂ 3.1 moles of oxygen will used.
Message are carried from the eye to the brain by
Answer:Brain
Explanation:
Answer:
It is the nerves :)
Explanation:
What's the mass of 14.4 mol F2
Answer:
Mass = 547.2 g
Explanation:
Given data;
Mass of F₂ = ?
Moles of F₂ = 14.4 mol
Solution:
Formula
Number of moles = mass/ molar mass
Mass = number of moles × molar mass
Molar mass of F₂ = 38 g/mol
Mass = 14.4 mol × 38 g/mol
Mass = 547.2 g
The mass of 14.4 moles of F₂ is 547.2 grams.
To solve this, we need to know the molar mass of fluorine gas (F₂). Each fluorine atom has an atomic mass of approximately 19.0 g/mol. Since F₂ is a diatomic molecule, its molar mass is:
19.0 g/mol × 2 = 38.0 g/mol
Now, we multiply the molar mass by the number of moles given:
14.4 mol × 38.0 g/mol = 547.2 g
Thus, the mass of 14.4 moles of F₂ is 547.2 grams.
What is the procedure for ranking plants
Taxonomy is the procedure for ranking plants.
Explanation:
The plants are ranked depending upon the resemblances and differences it has from another kind of plants. They can be ranked depending upon their leaves, roots, stems and other structures. They are defined into more general categories depending on the similar traits in the same group.
The plants are broadly classified into vascular and non vascular .Example, a flowering plant is a higher green plant and based on its gross structure does lie in the kingdom of Plantae, not in fungus or bacteria.
If nitrogen, with an oxidation state of -3, undergoes a synthesis reaction with H2, which has an oxidation state +1, what balanced equation shows the product formed?
2NH → N2 + H2
N2 + H2 → N2H2
2NH3 → N2 + 3H2
N2 + 3H2 → 2NH3
Answer:
N₂ + 3H₂ → 2NH₃
Explanation:
Nitrogen react with hydrogen and form ammonia. The one mole of nitrogen gas react with two moles of hydrogen and form two moles of ammonia.
The oxidation state of nitrogen is -3 while that of hydrogen is +1. That's why two balance the charge one with one nitrogen atom three hydrogen atom react and with two nitrogen atom with a charge of -6 six hydrogen atoms are attached (+6).
Chemical equation:
N₂ + H₂ → 2NH₃
Balanced chemical equation;
N₂ + 3H₂ → 2NH₃
The balanced equation for the synthesis reaction between nitrogen and hydrogen to produce ammonia is N2 + 3H2 → 2NH3.
Explanation:The balanced equation that shows the product formed when nitrogen with an oxidation state of -3 undergoes a synthesis reaction with H2, which has an oxidation state of +1, is:
N2 + 3H2 → 2NH3
In this reaction, one molecule of N2 reacts with three molecules of H2 to produce two molecules of NH3. The coefficients in the balanced equation represent the mole ratio required for the reaction to occur.
There are diffrent types of cells for every job in your body. How do we refer to those cells that develop differently?
A) They are unidirectional.
B) They are unorganized.
C) They are specialized.
D) They are usually damaged.
Answer:
The correct answer is c they are specialized.
Explanation:
Human body contain various types of cells and each specific type of cell performs specific functions.
For example nerve cells help in propagation of action potential from one neuron to the next.
Heart cells of our body act as a pump.Basically heart cells pump blood.
Blood cells helps in transport of various biomolecules and fight against invaded pathogens.
Lung cells helps in the exchange of oxygen and carbon dioxide gas to and from our body.
kidney cells helps in the filtration of blood and formation of urine
Answer: (C They are specialized
Explanation:
1. How many moles of AgNO3 are in 15.0 g?
Answer: 0.088 moles
Explanation:
Parameters given:
Mass of AgNO3 = 15.0g
To know the number of moles, given such parameter, we need to find and use the molecuar weight formular. The molecuar weight is mass per mole
Molecular weight = mass / mole
Molecular weight of AgNO3
Ag + N + 03
107.8682 + 14.0067 + 15.9994(3)
(Note, that the weight of each compounds are standards)
= 169.8731g/mole
Using our molecular weight formular
Moles of AgNO3 in 15.0g
Let Number of Moles be represented as Y
169.8731g/mole = 15.0g / Y
Therefore,
Y = 169.8731 / 15.0g
Y = 0.088 moles
No of Moles of AgNo3 in 15.0g = 0.088moles
To separate a mixture of iron filings and salt, the
most efficient method wouid be
passing a magnet through the mixture
sorting the mixture by hand
distilling the mixture
The most efficient method would be to passing a magnet through the mixture.
Explanation:
a) passing a magnet through the mixture
It is the most efficient method to separate the iron fillings and the salt. The iron will be attracted by the magnet, because the presence of the unpaired electrons in the iron which induces paramagnetic properties and it will be attracted by the magnet, while the salt, which most probably sodium chloride which does not have unpaired electrons so it will be a diamagnetic compound that is not be attracted by a magnet.
b) sorting the mixture by hand
It is a ineficient way to separate the iron from the salt because it will require a lot of energy and time.
c) distilling the mixture
It is extremely hard to do that because iron and salt have very high boiling points.
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The best way to separate a mixture of iron filings and salt is to use a magnet, which attracts the iron. The other methods (sorting by hand, distilling) are less efficient and not suitable for this mix.
Explanation:The most efficient method to separate a mixture of iron filings and salt is to pass a magnet through the mixture. This is because iron is magnetic, while salt is not. The magnet will attract the iron filings and leave the salt behind. Following this process, you could rinse or carefully brush the iron filings off the magnet. This is a simple process called magnetic separation.
Sorting the mixture by hand or distilling the mixture is not recommended. Manually sorting can be tedious and might not effectively separate all the iron filings while distilling is usually used to separate liquid mixtures, not solids like iron filings and salt.
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My name Means "colored bodies" and I contain DNA.I pass on traits to ti a new cell,but only in a systematic way
Here’s a hint for you…the Latin root for color is "chroma"
The Latin root for body is "soma"...
That should help you figure out the answer for yourself!
P.S. The answer is Chromosomes.
Hope this helps
Determine the volume (in ml) of a 3.57 M solution of Zi Bry that contains 0.884 moles of ZnBr2
Answer:
The volume (in ml) of a 3.57 M solution of [tex]ZnBr_2[/tex] that contains 0.884 moles of [tex]ZnBr_2[/tex] is 247.61g mL
Explanation:
According to the definition of Molarity
which sates
"The amount of moles of a substance present in one litre of the solution is called as Molarity."
3.57M [tex]ZnBr_2[/tex] solution implies that 1000 mL of the solution conatins 3.57Moles of [tex]ZnBr_2[/tex]
Hence , 3.57 moles of [tex]ZnBr_2[/tex] is present in the 1000 ml of solution
Now,
In 1 mole of [tex]ZnBr_2[/tex] is present in the =[tex]\frac{1000}{3.57}[/tex]ml of solution
Similarily ,
In 0.884 moles of[tex]ZnBr_2[/tex] is present in the [tex]\frac{1000\times 0.884}{3.57}[/tex] of solution= 247.61g mL
Provide two written definitions of an oxidation-reduction reaction and for each definition tell which reactant is reduced and which is oxidized. Then tell which of the two definitions is the most comprehensive.
Answer:
Explanation:
Oxidation:
1) Oxidation involve the removal of electrons.
2) Oxidation occur when oxidation state of atom of an element is increased.
Reduction:
1) Reduction involve the gain of electron.
2) Reduction is occur when number of electrons increased in an atom and oxidation state decreased.
Consider the following reactions.
4KI + 2CuCl₂ → 2CuI + I₂ + 4KCl
the oxidation state of copper is changed from +2 to +1 so copper get reduced.
CO + H₂O → CO₂ + H₂
the oxidation state of carbon is +2 on reactant side and on product side it becomes +4 so carbon get oxidized.
Na₂CO₃ + H₃PO₄ → Na₂HPO₄ + CO₂ + H₂O
The oxidation state of carbon on reactant side is +4. while on product side is also +4 so it neither oxidized nor reduced.
H₂S + 2NaOH → Na₂S + 2H₂O
The oxidation sate of sulfur is -2 on reactant side and in product side it is also -2 so it neither oxidized nor reduced.
The most comprehensive definition is 2nd definition which involves the increase or decrease in oxidation state.
An oxidation-reduction (redox) reaction is a chemical reaction in which one or more elements undergo a change in oxidation number. One reactant is reduced and another reactant is oxidized.
Explanation:An oxidation-reduction (redox) reaction is a chemical reaction in which one or more elements undergo a change in oxidation number. In these reactions, one reactant is reduced and another reactant is oxidized. For example, in the reaction 2Mg(s) + O2(g) → 2MgO(s), magnesium (Mg) is oxidized from an oxidation state of 0 to +2 and oxygen (O2) is reduced from an oxidation state of 0 to -2.
The most comprehensive definition of a redox reaction is the one that states that redox reactions are those in which one or more elements involved undergo a change in oxidation number. This definition encompasses all redox reactions, including those that involve changes in oxidation number for two or more elements.
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what is brownian motion
Answer: Brownian motion or pedesis is the random motion of particles suspended in a fluid resulting from their collision with the fast-moving molecules in the fluid. This pattern of motion typically alternates random fluctuations in a particle's position inside a fluid sub-domain with a relocation to another sub-domain.
Write the correct number of protons and neutrons and electrons in the following ions aluminum (+3) please help!
Answer: 13 proton, 10 electron and 14 neutron.
Explanation: electron are 10 because 3 electrons are transfer to other atom.
Answer:
Proton = 13
Electron = 10
Neutron = 14
Explanation:
Al3+ means Al that has lost 3 electrons. Al has 13 protrons and 13 electrons. Having lost 3 electrons, Al3+ is left with 10 electrons.
Neutron + protron = relative atomic number
n + 13 = 27
n = 27 - 13 = 14
what is larger,an atom or an element?Explain
An atom is smaller than an element since an element is composed of many atoms. Atoms make up the smallest unit of an element that maintains the element's properties. The size of atoms varies and can be compared using the periodic table, with atoms generally increasing in size down a group and decreasing across a period.
Explanation:When comparing the size of an atom to that of an element, it is essential to understand that these terms describe different concepts in chemistry. An atom is the smallest unit of matter that retains the properties of an element, meaning it is a single particle. Conversely, an element is a pure substance made up of one type of atom. Therefore, while atoms are the tiny building blocks that make up elements, the term 'element' refers to the collective group of these atoms when considered as a whole. For example, a gold nugget is composed of multiple gold atoms but is still referred to as the element gold. Given this distinction, atoms are the smaller of the two when comparing size.
Size-wise, individual atoms can vary depending on the type of element. For instance, a helium atom is smaller than a lead atom. If we refer to the periodic table, we can compare the relative sizes of atoms based on their position. Typically, atoms increase in size as you move down a group (column) and decrease as you move across a period (row) from left to right. Hence, elements found further down and to the left of the periodic table generally have larger atoms than those towards the top right. However, it's often necessary to consider atomic radii and various other factors to make precise comparisons between atom sizes.
Solid nickel reacts with aqueous nitric acid (HNO3) to form aqueous nickel (III) nitrate and hydrogen gas. Write out and balance the chemical equation, including phases.
Ni (s) + 2 HNO₃ (aq) → Ni(NO₃)₂ (aq) + H₂ (g)
Explanation:
We have the following balanced chemical equation:
Ni (s) + 2 HNO₃ (aq) → Ni(NO₃)₂ (aq) + H₂ (g)
where:
(aq) - aqueous (dissolved in water)
(g) - gaseous
To balance the chemical equation the number of atoms of each element entering the reaction have to be equal to the number of atoms of each element leaving the reaction, in order to conserve the mass.
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How do you read a data table?
Answer:
1st you read the column that has the subject then the tally column last you determine/read the frequency column
Explanation:
calculate the volume of the chlorine that would be required to react completely with 3.70g of dry slaked lime according to the equation Ca(OH)2+Cl=CaOCl2+H2O
H =1,O=16,CA=40,1 mole of gas occupies 22.4dm3 at s.t.p
To react completely with 3.70g of dry slaked lime, 1.12 liters of chlorine gas would be required at STP, based on mole calculations and the ideal gas law.
To calculate the volume of chlorine gas that would react completely with 3.70g of dry slaked lime (Ca(OH)₂), we need to follow a series of steps:
First, we calculate the moles of Ca(OH)₂ using its molar mass (Ca = 40, O = 16, H = 1). The molar mass of Ca(OH)₂ is: (40) + (2 x 16) + (2 x 1) = 74 g/mol.
Next, we find the moles of Ca(OH)₂ in 3.70g by dividing the mass by the molar mass: moles of Ca(OH)₂ = 3.70 g / 74 g/mol = 0.05 moles.
According to the equation, 1 mole of Ca(OH)₂ reacts with 1 mole of Cl₂. Therefore, we need 0.05 moles of Cl₂.
We use the ideal gas law at standard temperature and pressure, where 1 mole of a gas occupies 22.4dm³. The volume of Cl₂ needed is 0.05 moles x 22.4 dm³/mole = 1.12 dm³, or 1.12 liters.
Therefore, 1.12 liters of chlorine gas would be required to react completely with 3.70g of dry slaked lime at standard temperature and pressure (STP).
Consider the reaction pathway graph below.
Which indicates the energy that must be absorbed to initiate the reaction?
C
A
E
D
The statement that indicates the energy that must be absorbed to initiate in the reaction pathway is "A".
What is reaction pathway?A reaction mechanism, also known as a reaction route, specifies the molecular processes that occur in a chemical reaction. It defines the series of reactions that must occur in order to create a desired result.
When the bonds in the reactant molecules are disrupted, more energy is absorbed than is released when new bonds are generated in the products.
The amount of free energy which must be necessarily added to get from the energy level of the reactant molecules to the energy level of the product is the activation energy for the forward reaction. In plenty of other respects, activation energy is the input amount of energy needed for a reaction to take place.
Many chemical processes, including essentially all biochemical processes, do not occur spontaneously and require an initial energy input (known as the activation energy) to begin. When studying both endergonic and exergonic reactions, activation energy must be taken into account.
Hence the correct answer is A.
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what is the energy of a wave with a frequency of 6.58x10¹³ Hz
energy of the wave is equal to 43.6 × 10⁻²¹ J
Explanation:
The energy of a wave knowing the frequency is calculated using the following formula:
energy = plank constant × frequency
energy = 6.63 x 10⁻³⁴ J·s × 6.58 × 10¹³ s⁻¹ (Hz)
energy = 43.6 × 10⁻²¹ J
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Determine the percent yield for the reaction between 6.92 g K and 4.28g of oxygen gas if 7.36 g of potassium oxide is produced.
Answer:
percentage yield = 88.25%
Explanation:
Firstly, write the chemical reaction and balance the equation.
Potassium react with oxygen to produce potassium oxide.
K + 02 → K2O
Balance the equation
4K + 02 → 2K2O
The limiting reactant is K so the yield of potassium oxide can be calculated using grams for potassium.
atomic mass of K = 39.1g/mol
grams for 4 mole of potassium = 4(39.1) = 156.4 g
grams for 2 moles of K2O = 2( 39.1 × 2 + 16) = 188.4 g
If 156.4 g of K produces 188.4 g of K2O
6.92 g of K will produce ? gram of K2O
cross multiply
grams of K2O = 6.92 × 188.4/156.4
grams of K2O = 1303.72/156.4
grams of K2O = 8.33585677749
grams of K2O = 8.34 g
percentage yield = actual yield/theoretical yield × 100
actual yield = 7.36 g
theoretical yield = 8.34 g
percentage yield = 7.36/8.34 × 100
percentage yield = 736/8.34
percentage yield = 88.2494004796%
percentage yield = 88.25%
Taking into account definition of percent yield, the percent yield for the reaction is 88.25%.
Reaction stoichiometryIn first place, the balanced reaction is:
4 K + O₂ →2 K₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
K: 4 molesO₂: 1 mole K₂O: 2 molesThe molar mass of the compounds is:
K: 39 g/moleO₂: 32 g/mole K₂O: 94 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
K: 4 moles ×39 g/mole= 156 gramsO₂: 1 mole ×32 g/mole= 32 grams K₂O: 2 moles ×55 g/mole= 188 gramsLimiting reagentThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
Limiting reagent in this caseTo determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 32 grams of O₂ reacts with 156 grams of K, 4.28 grams of O₂ reacts with how much mass of K?
[tex]mass of K=\frac{4.28 grams of O_{2} x 156 grams of K}{32grams of O_{2}}[/tex]
mass of K= 20.865 grams
But 20.865 grams of K are not available, 6.92 grams are available. Since you have less mass than you need to react with 4.28 grams of O₂, K will be the limiting reagent.
Mass of K₂O formedConsidering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 156 grams of K form 188 grams of K₂O, 6.92 grams of K form how much mass of K₂O?
[tex]mass of K_{2} O=\frac{6.92 grams of Kx188 grams of K_{2} O}{156 grams of K}[/tex]
mass of K₂O= 8.34 grams
Then, 8.34 grams of K₂O can be produced from 6.92 grams of K and 4.28 grams of O₂.
Percent yieldThe percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.
The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:
[tex]percent yield=\frac{actual yield}{theoretical yield}x100[/tex]
where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.
Percent yield for the reaction in this caseIn this case, you know:
actual yield= 7.36 gramstheorical yield= 8.34 gramsReplacing in the definition of percent yields:
[tex]percent yield=\frac{7.36 grams}{8.34 grams}x100[/tex]
Solving:
percent yield= 88.25%
Finally, the percent yield for the reaction is 88.25%.
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Distinguish between dunes and loess
Answer:
Dunes are loose sand hills.
Loess is a compacted wind-blown formation of sediment.
Explanation:
Sand dunes are, as their name implies, made of sand which is itself made of tiny quartz pieces. Sand dunes are present where there is a ready source of broken down sandstone or other type of rock and wind to transport the sand. The dunes are mobile and loose and migrate over time.
Loess comes in vast formations and was created in a very different way. In the last ice age, winds from the north carried sediments loosened and ground by glaciers southwards. There, the sediments accumulated in large formations and became compacted over time.
Explain how two compounds can have the same percentage composition but different molecular masses?
Two compounds can have same percentage composition but different molar mass, where the composition of each element contributed into the total mass can be same for two compounds irrespective of their molar mass.
What is percentage composition?Percentage composition of a compound is the mass by percent of its constituent elements of groups. Molecular mass of a compound is the sum of the mass of its constituent elements.
Let AB₂ be a compound and the total molecular mass be X,the percentage of A be a% and that of b being b%, where b will be greater since there are 2 B groups.
There can be compounds with a % of A and b% of B but with different molar mass. Thus, there will be compounds which contains same mass percent of one elements.
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Final answer:
Two compounds can have the same percentage composition but different molecular masses because they can be structural isomers, which have the same number and types of atoms but arranged differently resulting in different properties and molar masses.
Explanation:
Compounds with Same Percentage Composition and Different Molecular Masses
Two compounds can have the same percentage composition but different molecular masses due to the phenomenon of isomerism. Isomers are molecules that have the same molecular formula, meaning the same number and types of atoms, but with the atoms arranged in a different manner. This results in different structures and potentially different physical properties, including molecular masses. The percentage composition only reflects what percent of the compound's total mass is made up by each type of atom, regardless of the compound's structure.
For instance, structural isomers have the same chemical composition but different arrangements of atoms and different chemical bonding, leading to different molar masses. To determine the percentage composition, one would divide the atomic mass of each element by the total molar mass of the molecule. However, this calculation doesn't account for the structural differences between isomers.
Examples of this include butane and isobutane, both of which have the molecular formula C4H10 but differ in structure and therefore in their molar mass. Such scenarios illustrate the importance of not only considering the percentage composition but also the molecular structure when identifying and comparing substances.
In covalent bonds, atoms share electrons to fill up energy levels.
True or False
TRUE
Explanation:
Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability. By sharing their outer most electrons, atoms can fill up their outer electron shell and gain stability. So, it is true.
Which substance can not be decomposed by chemical means ?
Answer:
Elements :)
Explanation:
Neon (Ne), being an element, is the substance that cannot be decomposed by chemical means from the given list. All other options are chemical compounds that can be decomposed into elements.
The question is about identifying a substance that cannot be decomposed by chemical means from a given list. Substances that cannot be chemically decomposed are known as elements, which are the most basic form of matter that cannot be broken down into simpler substances. Based on the options provided (Ne, N₂O, HF, H₂O), Neon (Ne) is an element and thus cannot be decomposed chemically into simpler substances.
The rest of the substances are chemical compounds: N₂O (nitrous oxide), HF (hydrogen fluoride), and H2O (water). These compounds can be decomposed into their elements by chemical reactions, such as hydrolysis or electrolysis for water. Therefore, the correct answer is Ne, which is an inert noble gas and an element that cannot be decomposed by chemical means. Option A
Redox equations are _____ when the total increase in oxidation numbers equals the total decrease in oxidation numbers.
A. balanced
B. combined
C. different
D. equal
Answer:
The correct answer is A balanced
Explanation:
Redox reaction belongs to specific type of chemical or biochemical reaction in which oxidation and reduction occurs simultaneously.
For example
6CO2+12H2O=C6H12O6+6O2+6H2O
The above reaction is a redox reaction because in this reaction CO2 is reduced to form glucose whereas H2O is being oxidized to form O2.
Redox equations are balanced when the total increase in the oxidation number equals the total decrease in the oxidation number.
Answer:
A. balanced
Explanation:
Hello,
In this case, redox reactions undergo when one the elements at the reactants suffers an increase in its oxidation state and other elements suffers a decrease in its oxidation state. Thus, one could consider the following example:
[tex]H_2+I_2\rightarrow HI[/tex]
In that case, both hydrogen and iodine have zero as their oxidation states at the reactants whereas they go +1 and -1 respectively at the hydroiodic acid as shown below:
[tex]H_2^0+I_2^0\rightarrow H^+I^-[/tex]
In such a way, each hydrogen increases by 1 electron (two electrons in total as there two hydrogens) and iodine decreases by 1 electron (two electrons in total as there two iodines). Thus, the balance turns out:
[tex]H_2^0\rightarrow 2H^++2e^-\\I_2^0+2e^-\rightarrow 2I^-\\\\\\2H_2+2I_2\rightarrow 4HI\\\\H_2+I_2\rightarrow 2HI[/tex]
Therefore, redox equations are A. balanced when the total increase in oxidation numbers equals the total decrease in oxidation.
Best regards.
Rain forest decomposers break down plant matter before it has a chance to build up. What do you think the difference is in temperate forests that allow layers of leaf litter to accumulate?
Your answer should include at least two complete sentences.
Answer:
The soil is more developed and more fertile.
Explanation:
The lack of immediate decomposers in temperate forests allows the vertical profile of the soil to develop more thanks to the accumulation of plant matter. As a result, the soils of temperate forests are eroded less easily by the element and they also tend to be more fertile than rain forest soils due to the slow decomposition of organic matter.
Earthquakes occur at faults where tectonic plates meet.
What is this statement an example of?
A. A conclusion scientists developed by observing patterns
B. An opinion policy makers use to influence which states get money
for disaster relief
C. A statement developed by policy makers to encourage people to
live far away from faults
D. An opinion scientists have of how the natural world works
Answer:
A
Explanation:
Earthquakes are said to occur at faults where tectonic plates run into each other because they have been observed to occur at those tectonic plate boundaries.
Part of the evidence for the theory of plate tectonics is the predictable occurrence of earthquakes and volcanoes along plate boundaries. The Pacific Ring of Fire is an example of a seismically active zone that has been observed and labelled based on the noted activity.
Acidic solutions contain high concentrations of
a. hydrogen ions
b. hydroxide ions
c. water
Answer:
hydrogen ions
Explanation:
because acid is the specie that have ability to donate proton or forming bond with electron pair
Acidic solutions have high concentrations of hydrogen ions.
When an acid dissociates in aqueous solution, it releases hydrogen ions, leading to increased H+ concentration and making the solution acidic. This is due to the higher proportion of H+ ions compared to hydroxide ions in acidic solutions.