Answer:
Light
Explanation:
All of the other conditions are the same. As an example the amount of water which sally apply to each plant is the same. So the independent
variable that she is experiment on is the effects of different kinda lights on the growth of the bean plants
The source of light is the independent variable in the experiment of how the type of light affects the height of bean plants.
What is an independent variable?The independent variable is the variable that cannot be influenced or disturbed by the effect of the other factors or the characteristics of another thing present in the system.
In the experiment on how the type of light affects the height of bean plants, the light source LED, incandescent, and CFL have their own characteristics and cannot be affected by anything in the environment.
Therefore, in the experiment on how the type of light affects the height of bean plants, the source of light is the independent variable.
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How is the Bohr atomic model different from the plum-pudding model?
A. In Bohr's model, the atom's mass is found at its center instead of
distributed throughout.
B. In Bohr's model, the atom's mass is mostly made up of electrons
instead of protons.
C. In Bohr's model, the volume of the atom is mostly made up of the
nucleus.
D. In Bohr's model, the atom consists of positive charges circling a
negatively charged nucleus.
Answer:
A. In Bohr's model, the atom's mass is found at its center instead of distributed throughout.
Explanation:
The Plum-Pudding model of an atom was proposed by the late J.J Thompson. In this model, an atom is seen as negative charged particles that are surrounded by a soup of positive charge, which was liken to Plum Pudding, an English dessert.
While in Bohr's model of an atom; negatively charged electrons move in clearly defined circular orbits around the atom's mass (positively charged), called Nucleus.
The Bohr's model has been consisted of the central atom's mass. Thus option A is correct.
Atom has been smallest particle of matter has been consisted of electrons, protons, and neutrons as the subatomic particle. The structure of atom has been postulated with different theories and model.
Thomson's Plum Pudding Model has been the first model for elucidating the structure of the atom.
According to Thomson, the atom has been consisted of central positive nucleus with electrons present outside the nucleus in the distributed model. The structure has been similar to English dessert Plum and has been named as Plum pudding model.
The Bohr's atomic model has been the most accepted with the nucleus has been a small entity in the atom. The electrons have been supposed to be present in the atomic orbitals, and revolves around the nucleus. The model resembles solar system.
The Bohr's model has been different from the Plum pudding model as in Bohr's model, atoms have been consisted within the orbitals consisting of negative charged electrons and are revolving around the positive nucleus.
The atomic mass of the atom has been consisted in the central nucleus. Thus, option D is correct.
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In the reaction between Lithium Sulfate and an excess of Lead (II) Nitrate, how many molecules of Lithium Nitrate can be expected as a product if 13.3 grams of Lithium Sulfate are used? Show your work.
Li2SO4 + Pb(NO3)2 =
Answer:
[tex]1.46x10^{23}molecules \ LiNO_3[/tex]
Explanation:
Hello,
In this case, the undergoing chemical reaction is:
[tex]Li_2SO_4 + Pb(NO_3)_2 \rightarrow PbSO_4+2LiNO_3[/tex]
Thus, since lead (II) nitrate is in excess, we can directly compute the moles of lithium nitrate by applying the 1:2 molar ratio between them in the chemical reaction as well as the molar mass of Lithium Sulfate that is 110 g/mol for the stoichiometric shown below factor:
[tex]n_{LiNO_3}=13.3gLi_2SO_4*\frac{1molLi_2SO_4}{110gLi_2SO_4} *\frac{2molLiNO_3}{1molLi_2SO_4} =0.242molLiNO_3[/tex]
Finally, by using the Avogadro's number we are able to compute the molecules:
[tex]0.242molLiNO_3*\frac{6.022x10^{23}molecules\ LiNO_3}{1mol}=1.46x10^{23}molecules \ LiNO_3[/tex]
Best regards.
Complete question:
In the reaction between Lithium Sulfate and an excess of Lead (II) Nitrate, how many molecules of Lithium Nitrate can be expected as a product if 13.3 grams of Lithium Sulfate are used? Show your work.
Li₂SO4 + Pb(NO3)₂ = LiNO₃ + PbSO₄
Answer:
0.242 molecules of Lithium Nitrate
Explanation:
Given:
Li₂SO₄ + Pb(NO3)₂ = LiNO₃ + PbSO₄
A balanced form of the equation:
Li₂SO₄ + Pb(NO3)₂ = 2LiNO₃ + PbSO₄
When 13.3 grams of Lithium Sulfate (Li₂SO4 ) are used, the number of molecules of Lithium Nitrate (LiNO₃) that can be expected as a product is calculated as;
molecular mass of Li₂SO₄ = (7 x 2) + (32) + (16 x 4)
= 14 + 32 + 64
= 110 g
110 g of Lithium Sulfate -----------> 2 molecules of Lithium Nitrate
13.3 g of Lithium Sulfate ------------> ? molecules of Lithium Nitrate
= (2 x 13.3) / 110
= 0.242 molecules of Lithium Nitrate
Therefore, 13.3 grams of Lithium Sulfate will produce 0.242 molecules of Lithium Nitrate
The force between two objects, each of charge -Q is measured as +F when the objects are separated a distance 2d apart. If the charge on only one object is tripled, determine the new force between them:
Answer:
Fnew = k (-3Q *(-Q)) / (2d)²
Fnew = k * 3Q² /4d²
Explanation:
This is Coulomb's law
F = k (q₁*q₂)/r²
F - electric force
k - Coulomb constant
q₁, q₂ - charges
r - distance of charges
Starting situation : q₁ = -Q, q₂= -Q , r =2d
F = k (-Q*(-Q)) / (2d)²
F = k *Q² /4d²
NEW FORCE : q₁ = -3Q, q₂= -Q, r =2d
Fnew = k (-3Q *(-Q)) / (2d)²
Fnew = k * 3Q² /4d²
If the needle deflects East, what would happen if you reversed the current?
Answer:
the north and south poles will exchange places.
Explanation:
The intensity of the magnetic field produced around the conductor depends on the volume of current. Unless the position of the current is inverted, the compass needle travels in the same position, since the polarity of the magnetic field is inverted.
hope I helped!
Please Help!
Look at the electron-dot diagram for neon in the table above. Based on the table, explain why does neon have a very high ionization energy? Please use at least ONE complete content related sentence.
Answer:
Cause the electron-dot diagram for neon is the highest: 18
Explanation:
Iron nails are often coated with paint or zinc to reduce rusting. Iron usually rust when getting in contact with which of the following?
CO2
H2
N2
O2
Iron rusts due to oxidation, which is basically just iron reacting with oxygen to produce iron oxide, which is called rust.
What are the conditions for an addition reaction?
Answer:
I don't understand
Explanation:
Answer:
Molecules containing carbon—hetero double bonds like carbonyl (C=O) groups, or imine (C=N) groups, can undergo addition, as they too have double-bond character. An addition reaction is the reverse of an elimination reaction. For instance, the hydration of an alkene to an alcohol is reversed by dehydration.
hope that helps!
In the following table, all the columns for the element oxygen are filled out correctly. Element Electron Structure of Atom Electron Structure of Ion Net Ionic Charge Oxygen 1s2, 2s2, 2p4 1s2, 2s2, 2p6 -2 True False
Answer:
1s², 2s², 2p⁴
Explanation:
Hello,
To determine the filling of electrons in an orbital, we'll have to apply several rules such as
1. Aufbau principle
2. Hunds rule
3. Pauli's exclusion principle.
I won't explain the above rules because I don't want to deviate from the question, but however if you understand them, it'll make questions like this easier to answer.
For oxygen atom
₈O = 1s² 2s² 2p⁴
The filling of the orbital must start with 1s orbital till the space of the two electrons are filled before moving to 2s orbital filling the two space in the shell and then finally the remaining 4 electrons on the 2p orbital.
Assuming the net ionic charge of oxygen in this case is zero (0) and has not accepted electron.
However, oxygen usually accepts 2e⁻(electrons) to attain stability (all orbital strive to attain duplet or octet configuration).
Assuming we have O²⁻, the electron configuration change to 1s² 2s² 2p⁶. This is the state oxygen usually forms compounds in excerpts with group 1 metals where it is able to form super oxide.
Which of the following is true about Earth's supplies of freshwater?
a. Most liquid freshwater is stored in rivers and lakes.
b. Groundwater is a significant reservoir of liquid freshwater.
c. Liquid freshwater is about half of all the water on Earth.
d. None of the above.
Answer:
b
Explanation:
Groundwater is a significant reservoir of liquid freshwater is true about Earth supplies of ground water.
What is Fresh water?Freshwater refer to maturally occurring wateror frozen water containing that is supplied by the Earth which has low concentrations of dissolved salts and other total dissolved solids.
Freshwater is normally supplied by the Earth.
Therefore, Groundwater is a significant reservoir of liquid freshwater is true about Earth supplies of ground water.
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What would happen to a weak acid dissociation equilibrium if more reactants
were added
A. The concentration of reactants would increase.
B. Equilibrium concentrations would not change.
C. The concentration of products would increase.
D. The equilibrium constant would change.
K is unchanged. The equilibrium constant wouldn't change. it is based on le chateliers principle.
Equilibrium concentrations would not change. Hence, option B is correct.
What is chemical equilibrium?Chemical equilibrium is a reversible chemical reaction in which no net change in the amounts of reactants and products occurs.
Step-by-step explanation:
The general equation for the dissociation of a weak base is
B + H₂O ⇌ BH⁺ + OH⁻
According to the principle, when stress is applied to a system at equilibrium, the system will respond in a way that tends to relieve the stress.
If you apply stress by adding more BH⁺ or OH⁻, the system will respond by moving in a direction that gets rid of the added ions.
The position of equilibrium will shift to the left, forming more of the undissociated base.
Hence, equilibrium concentrations would not change.
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A solution has [OH-] of 1x10^-2, what is the pOH of this solution
Answer:
The answer is: [D]: "12" .
Explanation:
i just did it
how many atoms of potassium and how
many atoms of oxygen must be present in the
compound's formula?
Which is the anode and which is the cathode?
2H+ + 2e- ➖> H2 (g)
2I- ➖> I2 + 2e-
Answer:
2l- ---> l2 + 2e- is the anode
2H+ + 2e- ---> H2(g) is the cathode
Explanation:
Oxidation occurs when a metal loses two or more electrons in a redox chemical reaction and reduction is when it gains. Thus, oxidation is the anode and reduction is the cathode.
HELLLPPP!
Interval Training means:
A)Incorporating a variety of exercises into your workout routine
B)Alternating short bursts of intense activity with active recovery
C)Strength training alternated with cardio exercises
D)Exercising for 10 minute periods multiple times a day
C)Strength training alternated with cardio exercises
Explanation:
Interval training is a type of training that involves a series of high intensity workouts interspersed with rest or relief periods. The high-intensity periods are typically at or close to anaerobic exercise, while the recovery periods involve activity of lower intensity.
Explain why mixtures are examples of a physical change. Why aren’t they a chemical change? What separates a physical change from a chemical change?
Help Pleaseee!!
Answer:
This is a physical change because it's not permanent and no chemical reaction occurs. Mixtures - Mixing together materials where one is not soluble in the other is a physical change. Note the properties of a mixture may be different from its components.
Explanation:
The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition.
In a physical change, the molecules are rearranged while their actual composition remains same. In a chemical change, the molecular composition of a substance completely changes and a new substance is formed. Some example of physical change are freezing of water, melting of wax, boiling of water....
Drag each label to the correct location on the diagram. Each label can be used more than once.
What is the correct way to represent the ionic compound sodium fluoride?
Answer:
NaF
Explanation:
I'm not exactly sure what you are asking for, but this is the formula for sodium fluroride.
We need the diagram to be able to help you with this, please take a screenshot of the diagram.
Drag the tiles to the correct locations. Each tile can be used more than once, but not all tiles will be used. Some locations will remain empty.
Chloramine has the chemical formula NH,CI. Nitrogen has five valence electrons, each hydrogen has one valence electron, and chlorine has
seven valence electrons. Complete the Lewis structure for this covalent compound.
Answer:
A lewis structure shows the electrons on the valence shell of a molecule as dots.
Explanation:
A lewis structure refers to a structure in which dots are used to represent the electrons present on the outermost shells of the atoms comprising the bond. So stones a line is used to show a pair of electrons shared by two atoms in a covalent bond.
This system was put toward by Sir G.N Lewis in 1916 in his article titled, 'The atom and the molecule'. Lewis structures are based on the octet rule.
The image attached shows the lewis structure of chloramine. All the electrons present on the valence shell of all the bonding atoms is adequately shown in the image. There are fourteen valence electrons in the molecule as shown in the diagram. Recall that chlorine has seven valence electrons, nitrogen has five and each hydrogen atom has one valence electron each. The three lone pairs on the chlorine atom and one lone pair on the nitrogen atom is clearly shown in the image.
4 Points
The battery in the circuit shown is 9.0 V, and the current flowing through the
circuit is 3.0 A. What is the resistance?
Answer:
3 ohms
Explanation:
R=V / I
R=9V / 3 A
R=3 ohms
Aluminium would have similar properties to which of the following chemical elements?
Germanium
Gallium
Iron
Copper
Answer:
Gallium
Explanation:
Elements found in the same group of the periodic table, possess similar chemical properties. Aluminium and Gallium are found in Group 13 of the periodic table,hence, have similar properties.
Please help me with all 3! Thank You!!
When wood is burned is this a physical or chemical change ?
Answer:
physical
Explanation:
no chemical reaction is occurring
The bus company that your school uses is thinking about changing the material that
makes their current fleet of buses because the buses are running into problems with
corrosion, the reaction of metals with oxygen present in air to form metal oxides that
are not structurally sound and are visually unappealing. In addition, the current
construction material is difficult to shape and is not visually attractive. The bus
company has asked your teacher to recommend an alternative material that could be
used to manufacture the next round of buses needed for your school and other schools
in the district. In addition to meeting certain chemical and physical requirements, the
material recommended must also be affordable.
Answer:
):
Explanation:
What does the law of conservation of energy state about energy in a closed system?
Energy cannot be created or destroyed.
Energy can be created but not destroyed.
O Energy can be destroyed but not created.
O Energy can be either troyed or created.
Answer:
Energy cannot be created or destroyed.
Explanation:
According to the law of conservation of energy, energy can neither be created nor it can be destroyed. Energy can only be transformed from one matter to another. The conservation of energy remains constant in an isolated system. The law is applicable in the system that does not exchange energy in the environment. Energy changes its form but remains constant.
Answer:
Energy cannot be created or destroyed
Explanation:
It's A on Edge
does anyone know the answer?????
Answer:
In chemistry, pH (/piːˈeɪtʃ/) (abbr. power of hydrogen or potential for hydrogen) is a scale used to specify how acidic or basic a water-based solution is. Acidic solutions have a lower pH, while basic solutions have a higher pH.
Explanation:
that should answer ur question
In a single displacement reaction between Sodium Phosphate and Barium, how much of each product (in grams) will be formed from 10.0 grams of Barium? Show your work.
Answer:
14.6 g of barium phosphate
3.35 g of sodium metal
Explanation:
2Na3PO4(aq) + 3Ba(s) -------> Ba3(PO4)2(aq) + 6Na(s)
The first step in any such reaction is to but down the balanced reaction equation according to the stoichiometry of the reaction.
The two products formed are barium phosphate and sodium metal.
Number of moles of barium corresponding to 10.0g of barium = mass of barium/ molar mass of barium
Molar mass of barium = 137.327 g
Number of moles of barium = 10/137.327
Number of moles of barium = 0.0728 moles
For barium phosphate;
3 moles of barium yields 1 mole of barium phosphate
0.0728 moles yields 0.0728 moles × 1/3 = 0.0243 moles of barium phosphate
Molar mass of barium phosphate = 601.93 g/mol
Therefore mass of barium phosphate = 0.0243 moles × 601.93 g/mol = 14.6 g of barium phosphate
For sodium metal
3 moles of barium yields 6 moles of sodium metal
0.0728 moles of barium yields 0.0728 × 6 / 3 = 0.1456 moles of sodium
Molar mass of sodium metal= 23 gmol-1
Mass of sodium metal= 0.1456g × 23 gmol-1 = 3.35 g of sodium metal
What would the pOH of a solution be if the [H"]= 3.00 x 10-5 moles/liter?
8.52
9.48
Answer:
9.48
Explanation:
pH=-log(H+)
pOH+pH=14
Answer:
9.48
Explanation:
Got it right on Odessyware ;) Have a Nice Day!!!!
Place the atomic theories in the order in which they were published.
Answer:
Solid sphere model.Plum pudding model.Nuclear model.Planetary model.Quantum model.Explanation:
John Dalton proposed, the solid sphere model, he stated that atoms were indivisible and that every atom of a certain element had specific characteristics.J.J Thomson proposed, the plum pudding model, he stated that atoms were made of electrons that floated around a positively charged cloud.Ernest Rutherford proposed, the nuclear model, he stated that the atom was made of a central positive charge that was surrounded by electrons, it was not a cloud or sphere of positive energy, this, was concentrated in the nucleus and space where the electrons were was empty space.Niels Bohr proposed, the planetary model, he stated that electrons were around the positive nucleus but in orbits with different levels of energy.Lastly, Erwin Schrödinger proposed, the quantum model, this states that electrons move around a positive nucleus, but in waves, they are dispersed around the nucleus in orbitals.When an electron of a hydrogen atom travels from n = 4 to n = 2, a photon of energy 4.165 × 10-19 joules is released. Calculate the wavelength associated with this radiation.
Answer:
Explanation:
please delete this it was a mistake
Answer:
4.77 × 10-7 meters
Explanation:
Energy of photon, E = hν
Frequency of photon,
Thus, energy of photon,
Therefore, 4.165 × 10-19 joules =
λ =
λ =
λ = 4.77 × 10-7 meters
The frequency of a photon having energy of 4.165 × 10-34 joules is 4.77 × 10-7 meters.
When 47.2 J of heat is added to 13.4 g of a liquid, its
temperature rises by 1.74 °C.
What is the heat capacity of the liquid?
Answer: 2.02 J/g°C
Explanation:
To find the heat capacity, we have to manipulate the equation for heat.
q=mCΔT becomes C=q/(mΔT) to find heat capacity. Since we are given our values, we can plug in to find C.
[tex]C=\frac{47.2J}{13.4g*1.74°C}[/tex]
*Please ignore the capital A in front of the °C. In order to have ° in the equaiton, the A pops up.
[tex]C=2.02J/g°C[/tex]
How are elements in the last column of the periodic table similar?
A. They are all solids.
O B. They are all liquids.
C. They react easily.
D. They rarely react.
Elements in the same column of the Periodic Table have similar chemical properties. So what does that mean about their valence electrons? You guessed it! Elements in the same column of the Periodic Table have the same number of valence electrons – that's why they have similar chemical properties.
Elements in the last column of the periodic table similar D. They rarely react.
How are the elements in the last column of the periodic table similar?Similarly, in the last group (column) of the Periodic Table, all of the elements have their valence electron shells filled, so they are (for the most part) un-reactive with other elements; for this reason, we call this last group the "noble gases".
How are elements in the same column of the periodic table similar?Each column is called a group. The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements.
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