Answer:
Well, The best answer will be is A. Webbed feet for swimming.
Good Luck!~
[tex]^{Brazts[/tex]
Answer:
webed feet for swimming
Explanation:
i took k-12 test
Which of the following is a possible definition of a base?
Select one:
a. A substance that increases the concentration of hydronium ions in a solution
b. A compound that is a hydrogen ion acceptor in an acid-base reaction
c. A substance that is an electron pair acceptor in a reaction
d. A compound that gives off hydrogen ions in a reaction or solution
Answer:
The correct answer is B. A compound that is a hydrogen ion acceptor in an acid-base reaction
mechanism with a small activation energy or one with large activation energy
Answer:
Rate depends on the rate constant. The rate constant depends on temperature and activation energy. If you have lower activation energy the rate will be higher. This is why catalysts are added since catalysts provide an alternate pathway that requires lower activation energy and catalysts are added to increase the rate of reaction.
Explanation:
This is only the answer if you were asking:
"Which corresponds to the faster rate: a mechanism with a small activation energy or one with a large activation energy?"
Thats what I understood about your question.
The Weak Ionization constant (Ka) for HCOOH is equal to:
Please help me lol
Answer:
[tex]Ka=\frac{[H^+][HCOO^-]}{[HCOOH]}[/tex]
Explanation:
Hello,
In this case, the weak ionization reaction for formic acid is:
[tex]HCOOH(aq)\rightleftharpoons H^+(aq)+HCOO^-(aq)[/tex]
In such a way, we simply recall the law of mass action in order to represent the weak ionization constant, Ka, for such process, by taking into account that the concentration of products is divided over the concentration of reactants as shown below:
[tex]Ka=\frac{[H^+][HCOO^-]}{[HCOOH]}[/tex]
Best regards.
Answer:
[tex]Ka=\frac{[CH_3COO^-][H^+]}{[CH_3COOH]}[/tex]
Explanation:
In this case we have to start with the ionization reaction of [tex]CH_3COOH[/tex], so:
[tex]CH_3COOH~<->~CH_3COO^-~+~H^+[/tex]
With this in mind we can calculate the mathematical expression of Ka (The production of hydronium ions [tex]H^+[/tex]), so:
[tex]Ka=\frac{[CH_3COO^-][H^+]}{[CH_3COOH]}[/tex]
I hope it helps!
Consider the following unbalanced equation. How many Liters of bromine are needed to produce 12 moles of Aluminum bromide? The density of bromine is 3.1 g/mL.
Al (s) + Br2 (l)= AlBr3 (s)
Answer:
0.92787 liters of bromine are needed to produce 12 moles of aluminum bromide.
Explanation:
You have the following balanced equation:
2 Al (s) + 3 Br₂ (l) ⇒ 2 AlBr₃ (s)
First of all, the following rule of three should be applied to know the amount of moles of bromine needed: if 2 moles of aluminum bromide are produced by stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction) for 3 mole of bromine, 12 moles of aluminum bromide with how many moles of bromine are produced?
[tex]moles of bromine=\frac{12 moles of aluminum bromide*3 mole of bromine}{2 mole of aluminum bromide}[/tex]
moles of bromine= 18
Being the molar mass of the bromine Br₂ 159.8 g/mol then the mass of 18 moles of Br₂ is:
18 moles* 159.8 g/mol= 2,876.4 grams
Density is a property that indicates the amount of mass per unit volume. Then the following rule of three applies: if by the definition of density 3.1 grams of bromine are present in 1 mL, 2,876.4 grams of bromine are present in how much volume is it?
[tex]volume=\frac{2,876.4 grams*1mL}{3.1 grams}[/tex]
volume= 927.87 mL
Being 1,000 mL= 1 L, then 927.87 mL= 0.92787 L
0.92787 liters of bromine are needed to produce 12 moles of aluminum bromide.
Answer:
[tex]V=929mL[/tex]
Explanation:
Hello,
In this case, the balanced chemical reaction is:
[tex]2Al (s) + 3Br_2 (l)\rightarrow 2AlBr_3 (s)[/tex]
In such a way, we use the 2:3 molar ratio between aluminum bromide and bromine and its atomic mass which is 160 g/mol to find the grams of bromine that are produced:
[tex]m_{Br_2}=12molAlBr_3*\frac{3molBr_2}{2molAlBr_3} *\frac{160gBr_2}{1molBr_2} =2880gBr_2[/tex]
Then we compute the volume:
[tex]V=\frac{m}{\rho}=\frac{2880gBr_2}{3.1g/mL}\\ \\V=929mL[/tex]
Regards.
Look at the reaction below.
H2SO4(aq) + Mg(s)->MgSO4(aq) + H2(g)
Which substance is the acid in the reaction?
Mg(s)
H2(g)
MgSO4(aq)
H2SO4(aq)
Mark this and return
Answer:
H2SO4
Explanation:
H2SO4 is actually one of the strongest acids, coming to pH value very close to 1 . Acids transfer their hydrogen ions to other substances , such as water , and usually have hydrogen their formula . In this case , H2SO4 has hydrogen in its formula and is acid in the case .
Hope it helps you !!
Answer:
person above me is right :)
Explanation:
Consider the graph. A graph labeled Heating Curve has time as the horizontal axis and Temperature as the vertical axis. A line starts at 0 and rises to 1500 degrees where it levels off briefly; this section of line is labeled solid. The line continues to rise until it levels off at about 2750; this curve is labeled Liquid. After running horizontal for some time, the line rises again; this curve is labeled Gas. Based on the information in the graph, which statement best applies to a gas? Its particles have the highest average kinetic energy. Its particles have the smallest volume of all three states of matter. Its particles are slowing down because of a temperature increase. Its particles are moving apart due to repulsion between them.
Answer:
Its particles have the highest average kinetic energy
Explanation:
This can be explained by the Kinetic Molecular Theory which explains the physical characteristics of solid, liquid, gas and how phases change from one to another.
Kinetic Energy ∝ TemperatureThe theory states the that average kinetic energy of particles is directly proportional to the temperature. When a solid is heated, its temperature and kinetic energy increase, eventually melting it into a liquid. If the temperature is raised even more, kinetic energy will increase even more and the liquid will eventually become a gas. This show that the gas has the highest temperature and hence the highest average kinetic energy compared to solid and liquid.
Answer:
Its particles have the highest average kinetic energy
Explanation:
This can be explained by the Kinetic Molecular Theory which explains the physical characteristics of solid, liquid, gas and how phases change from one to another.
Kinetic Energy ∝ Temperature
The theory states the that average kinetic energy of particles is directly proportional to the temperature. When a solid is heated, its temperature and kinetic energy increase, eventually melting it into a liquid. If the temperature is raised even more, kinetic energy will increase even more and the liquid will eventually become a gas. This show that the gas has the highest temperature and hence the highest average kinetic energy compared to solid and liquid.
Wht are the definitions of these words.
Communication systems
Import dependency
Opencast mine
Hinterland
Carbon capture
Answer:
this Is your communication system and Import dependency
When a 1.0 M KCl solution is electrolyzed using silver electrodes, a precipitate forms at the anode. Explain this result please.
Kick a ball and it'll fly up into the air before falling back down to the ground. A force is a pushing or pulling action that can make things move, change direction, or change shape. Which of these is NOT a force acting on the football?
A) The force of gravity is pulling the ball back to the ground.
B) Kicking the ball applies a force that sends it into the air.
C)The force of gravity sends the ball sailing through the goal post.
D)As the ball rolls across the ground, the force of friction brings it to rest.
Answer:
c
Explanation:
i think this is the answer hope this helps
Which type of resource uses flowing water to create electrical energy?
O Hydropower
O Natural gas
O Nuclear energy
O Solar power
Answer: Hydropower
Explanation: Hydropower is using water to power machinery or make electricity.It uses water as a fuel, water constantly moves through a vast global cycle, evaporating from lakes and oceans, forming clouds, precipitating as rain or snow, then flowing back down to the ocean.
Describe a method for making pure crystals of magnesium chloride from magnesium and dilute hydrochloric acid. In your method, you should name the apparatus you will use. (6 mark question)
Answer:
Check Explanation.
Explanation:
Magnesium and dilute hydrochloric acid react with each other to produce Magnesium Chloride and liberate hydrogen gas according to the reaction
Mg (s) + 2HCl (aq) → MgCl₂ (aq) + H₂ (g)
The procedure to obtain pure magnesium chloride from the reaction is as thus
Step 1: Reaction
- Leave the dilute hydrochloric acid in a beaker.
- Add Magnesium slowly until it is in excess or until no more gas seem to be getting liberated.
Step 2: Filtration
- Filter with filter paper and funnel.
- Filter off the excess magnesium as magnesium chloride will be in aqueous form (liquid) and will come out with the filtrate. The residue is the excess magnesium.
Step 3: Crystallization to obtain solid crystals from the filtrate.
- Pour filtrate solution into evaporating dish/basin
- Provide heat using Bunsen burner
- Pour solution into an evaporating basin and heat over a water bath
- Stop heating when crystals start to form
allow water to evaporate until pure crystals remain.
- Dry crystals using absorbent paper or warm oven.
Precautions
- Use personal protective equipment such as gloves, a lab coat and wear eye protection, especially when heating.
- Avoid inhaling unnecessary gases during the whole process.
Hope this Helps!!!
Pure crystals of magnesium chloride using dilute hydrochloric acid can be prepared by using three steps, Reaction, Filtration, and Crystallization.
[tex]\bold {Mg (s) + 2HCl (aq) \rightarrow MgCl_2 (aq) + H_2 (g)}[/tex]
According to the reaction, when Magnesium react with dilute hydrochloric acid, produce Magnesium Chloride and hydrogen gas.
1: Reaction
Put dilute hydrochloric acid in a beaker and add Magnesium slowly until no more gas seem to be produced. .
2: Filtration
Use filter paper and funnel.Since, magnesium chloride is in aqueous form and will come out with the filtrate(solution).3: Crystallization:
Use water bath to evaporate water of filtrate.Turn of the water bath as crystals start forming.Therefore, pure crystals of magnesium chloride using dilute hydrochloric acid can be prepared by using three steps, Reaction, Filtration, and Crystallization.
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NEED HELP!
Please refer to the picture for the question!
Answer: i think the best bet i can give you is Option C (2:3)
Explanation: i apologize i haven't done chem in 2 years
but however to put it in retrospect the finished equation is 2(AL)^+3 3(O)^-2
Mr. Holmes sure likes to play with Legos now that he is staying home these days. He was thinking that nuclear reactions were just like playing with lego pieces. Here are his three ideas why legos are like nuclear reactions.
1. If he builds a project that is too big, it will fall apart on its own because the connections are not strong enough to hold the pieces together.
2. Putting smaller lego pieces together to create bigger objects provides Mr. Holmes lots and lots of energy. He could keep doing this for a very long time.
3. While it causes a mess, Mr. Holmes gains energy by taking large objects and smashing them into smaller objects. While this is fun, it only lasts a limited time, because the large objects to smash are pretty scarce.
Which of the following reactions nuclear reactions is Mr. Holmes thinking of in this scenario?
Question 21 options:
1 – Fission 2 – Fusion 3-Radioactive Decay
1 – Radioactive Decay 2 – Fission 3 – Fusion
1 – Fusion 2 – Radioactive Decay 3- Fission
1 – Radioactive Decay 2- Fusion 3 – Fission
Answer:
1 – Fission 2 – Fusion 3-Radioactive Decay
Explanation:
The first scenario described in (1) is a fission reaction. Recall that in a nuclear fission, large nuclei disintegrate spontaneously. This is because the nuclei has a large number of nucleons hence a greater repulsion between them. This causes the large nuclides to be unstable and disintegrate spontaneously, releasing neutrons in the process.
The second scenario is typical of nuclear fusion, two light nuclei combine together to form a lager nucleus with a tremendous release of energy. This is typified in the fusion of hydrogen isotopes to form helium.
The third scenario depicts radioactive decay, radioactive decay often involves the spontaneous disintegration of a radioactive nucleus to form daughter nuclei with the emission of beta, gamma or alpha rays.
The probability that a person has immunity to a particular disease is 0.6. Find the mean number who have
immunity in samples of size 12
Answer:
20
Explanation:
12 divide by 0.6 equal to 20 mean
which best describes a difference between prokaryotic and eukaryotic cells
Answer:Please find the attachment
Explanation:
Convert 85.3 kl/sec into ml/min
Answer:
Then 85.3 [tex]\frac{kL}{sec}[/tex]=511,798,976.4 [tex]\frac{mL}{min}[/tex]≅ 5.118*10⁹ [tex]\frac{mL}{min}[/tex]
Explanation:
The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three. Remember that proportionality is a constant relationship or ratio between different magnitudes.
If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other) , the direct rule of three must be applied. To solve a direct rule of three, the following formula must be followed:
a ⇒ b
c ⇒ x
So,
[tex]x=\frac{c*b}{a}[/tex]
The direct rule of three is the rule applied in this case where there is a change of units.
You know:
1 kL= 1,000,000 mL1 minute=60 sec or, which is the same, 1 second = 0.0166667 minutesThen:
[tex]85.3 \frac{kL}{sec} =85.3 \frac{1,000,000 mL}{0.0166667 min} =511,798,976.4 \frac{mL}{min}[/tex]
Then 85.3 [tex]\frac{kL}{sec}[/tex]=511,798,976.4 [tex]\frac{mL}{min}[/tex]≅ 5.118*10⁹ [tex]\frac{mL}{min}[/tex]
what is it called when a nucleus ejects high energy photons
Answer:
Photodisintegration!
Explanation:
also called Phototransmutation, in physics, nuclear reaction in which the absorption of high-energy electromagnetic radiation (a gamma-ray photon) causes the absorbing nucleus to change to another species by ejecting a subatomic particle, such as a proton, neutron, or alpha particle.
What will happen is 95g of NH3 is placed in 65g of water at 65 degrees Celsius?
Answer:
i think wait if its cold idk but hot it will burn u
Explanation:
Plz hurry!!
When an electron moves from a lower to a higher energy level, the electron
A absorbs a continuously variable amount of energy
B always doubles its energy
C moves closer to the nucleus
D absorbs a quantum of energy
Answer:
Absorbs a quantum of energy
Explanation:
what are the products in a chemical reaction
Answer:
are species formed by chemical reaction
Explanation:
example when one element react with other new thing which is formed called product
eg. when oxygen react with hydrogen gas we obtain water so water is the product.
Answer:
The products of a chemical reaction are the substances formed from the reaction of two reactants. Basically, they are what is produced from the reaction and are usually written on the right side of the yield arrow in an equation.
What did John Dalton publish?
A The plum-pudding atomic eory
O B. An explanation of the photoelectric effect
O C. An early theory describing properties of atoms
OD. A paper calculating the charge of an electron
Answer:
The answer is C. An early theory describing properties of atoms
John Dalton published an early theory describing properties of atoms, thus the correct option is C.
An atom is defined as the smallest unit of matter that forms an element. Every form of matter whether it is solid,liquid , gas is made up of atoms . Each atom has a nucleus which is comprises of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral species and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged speciesand hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.The early theory on atom was given by Dalton.
Thus, the correct option is C.
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ASAPPP. Describe how you could determine the specific heat of a sample of a solid substance. You may
assume that the substance does not react with water. In your answer, make sure to include a
description of what equipment you would use and how you would interpret the data you collected.
Answer:
I would use calorimetric to determine the specific heat and I would measure the mass of a sample
Explanation:
I would use calorimetry to determine the specific heat.
I would measure the mass of a sample of the substance.
I would heat the substance to a known temperature.
I would place the heated substance into a coffee-cup calorimeter containing a known mass of water with a known initial temperature.
I would wait for the temperature to equilibrate, then calculate temperature change.
I would use the temperature change of water to determine the amount of energy absorbed.
I would use the amount of energy lost by substance, mass, and temperature change to calculate specific heat.
Answer:
I would use calorimetry to determine the specific heat. Then I would measure the mass of a sample of the substance. After that I would heat the substance to a known temperature. I would place the heated substance into a coffee-cup calorimeter containing a known mass of water with a known initial temperature. The coffee cup would be Styrofoam because it keeps the temperatures on the outside from getting on the inside and I would wait for the temperature to equilibrium, then I would calculate the temperature change. I would use the temperature change of water to determine the amount of energy absorbed. lastly, I would use the amount of energy lost by substance, mass, and temperature change to calculate specific heat.
Explanation:
An ultraviolet ray of light has a wavelength of 1.5x10^-8 m. What is the ray's
frequency?
Answer:
2 E16 Hz or 2 * 10^16 Hz
Explanation:
The formula to determine frequency is f = c / λ.
f = frequency
c = speed of light
λ = wavelength
f = 3E8 / 1.5E-8
f = 2E16
This makes sense because UV light exists roughly
between 8E14 Hz and 3E16 Hz ----- 2E16 Hz falls in that range
The ray frequency is 2 *[tex]10^{16}[/tex] Hz
How to find Ray's frequency?The formula to determine frequency is f = c / λ.
f = frequency
c = speed of light
λ = wavelength
f = 3*[tex]10^{8}[/tex] / 1.[tex]5^{-8}[/tex]
f = 2*[tex]10^{16}[/tex]
Frequency is the number of occurrences of a repeating event per unit of time.
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What is the electron configuration of chlorine (CI)?
1s22s s23p3
1s22s22p 3s 3p5
1s22s22p3s24s23p3
1s22s 23d
Answer:
1s²2s²2p⁶3s²3p⁵
Explanation:
Please see attached picture for working. (Answer using periodic table)
(See 2nd picture)
Alternatively, we can look at the subshell filling sequence.
Chlorine has 17 electrons.
So we start by filling the subshell with the lowest energy level, 1s.
The s subshell can fill a maximum of 2 electrons.
So what we have now is 1s²... with 15 electrons left.
Next, we look at the 2s subshell. Again, it can fill a maximum of 2 electrons.
1s²2s²... and we have 13 electrons left.
Moving on to the 2p subshell. The p subshell has 3 orbitals so it can fill a maximum of 6 electrons.
1s²2s²2p⁶... and we have 7 electrons left.
For the 3s orbital, it can fill another 2 electrons.
1s²2s²2p⁶3s²... 5 electrons to go!
Look at the 3p subshell. It can fill 6 electrons.
1s²2s²2p⁶3s²3p⁵
and we have obtained the electronic configuration of chlorine!
The electronic configuration of chlorine (CI) is 1s² 2s²2p⁶ 3s²3p⁵. None of the option is correct
How to write the electronic configuration of chlorine?Electronic configuration is defined as the arrangement of electrons in the orbital of an atom.
The s, p d, f notation has been the most widely used format in writing the electronic configurations of atoms.
Now, we shall write the electronic configuration of chlorine (CI). Details below:
Element: Chlorine, ClAtomic number = 17Electronic configuration =?Electronic configuration = 1s² 2s²2p⁶ 3s²3p⁵
Thus, the electronic configuration of chlorine is 1s² 2s²2p⁶ 3s²3p⁵. None of the options are correct.
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What is the name of this molecule? A. cis-2-pentene B. 2-pentyne C. 2-methylpentane D. Pentane
Answer:
Im sure its 2-Pentyne
So B. 2-Pentyne is the right answer
The name of the molecule which is present in the given image is 2-Pentyne as double bond is present at 2nd position.
What will bond show in structure?Presence of any bond in any structure of any molecule will tells about the unsaturation.
Double bonded molecule is known as alkene and triple bonded molecule is known as alkyne.
In the given diagram total 5 carbon atoms are present, two at the sides of triple bond, two at the corners and one at the bent position and triple bond is present at the middle of 2nd and 3rd carbon atoms. So, the name of the given compound is 2 pentyne.
Hence name of the compound is 2 pentyne.
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Why do we need energy and list three type of energy
Answer:
Energy is something very important to people. It helps to light our homes, dry our clothes, and even cook our food. If we didn't have energy I don't know where we'd be. Three types of energy are: Solar Energy, Wind Energy, and Hydro Energy.
Answer:
We need energy because without it we won't be the same. Infact, we won't be alive today. We use energy for everyday things and well, for everything.
Explanation:
3 types of energys are Electric, Atomic and Mechanical.
WOW thank you for 42 points c:
K+1 P-3 what is the formula for this ionic compound ? And the name ?
Answer:
1. K3P.
2. Potassium phosphide
Explanation:
During bonding of K^+1 and P^3-, there will be exchange of ions as follow:
K^+ + P^3- —> K3P
Therefore, the formula for the Ionic compound is K3P and the name of the compound is Potassium phosphide
The formula for this ionic compound K3P. Potassium phosphide.
Thus, The inorganic semiconductor compound potassium phosphide has the formula K3P. It appears as a powder or solid with white crystals.
It reacts violently with water and is poisonous when ingested, inhaled, or absorbed via the skin. Its shape is hexagonal and potassium phosphide.
White crystalline or powdered potassium phosphide is a solid. It might react strongly and catch fire if it comes into contact with water. It is harmful when ingested, inhaled, or absorbed via the skin. It is a component of other compounds.
Thus, The formula for this ionic compound K3P. Potassium phosphide.
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Which equation represents a reduction half-reaction?
A)
Fe Fe3+ + 3e–
B)
Fe + 3e– Fe3+
C)
Fe3+ Fe + 3e–
D)
Fe3+ + 3e– Fe
Answer:
Fe3+ + 3e– --------> Fe
Explanation:
Reduction refers to a gain of electrons. A specie is said to be reduced when it gains electrons or when it experiences a decrease in oxidation number. The both sentences above can be clearly seen when inspecting a reduction half equation.
Consider the redox reaction half equation;
Fe3+ + 3e– ------>Fe
We can see that Fe^3+ accepted three electrons, the oxidation number of iron thereby decreased from +3 to zero from left to right. This implies that the Fe^3+ was actually reduced according to the equation shown.
Equation which represents a reduction half - reaction is Fe³⁺ + 3e⁻ → Fe.
What is reduction?Reduction is a process in which addition of hydrogen or electron or removal of oxygen takes place.
From the given reaction, only last reaction represents a reduction half -reaction as:
Fe³⁺ + 3e⁻ → Fe
In this reaction on the left side iron is present in +3 oxidation state and due to addition of 3 electrons it converts into Fe atom which is in 0 oxidation state on the right side. So, due to addition of electrons reduction takes place.
Hence, Fe³⁺ + 3e⁻ → Fe represents a reduction half-reaction.
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Describe the relationship between the cell cycle and mitosis and the overall goals of each process.
Answer:
Explanation:
The cell cycle refers to the cell's lifecycle or the period of cellular growth and DNA replication. Mitosis represents the final step in the cell cycle—mitosis produces two identical daughter cells.
What are energy levels
Answer:
set distances were electrons can be sensed.
Explanation:
Energy levels are set distances from the nucleus of the atom where electrons can be sensed. Electrons are small, negatively charged particles in the atom that pass through the positive nucleus in the center. The energy levels are a little like the steps of the stairs. You may stand on one step or the other, but not between the moves. The same thing goes with electrons.
hope this helped!
