Answer:
It takes 83 mL of a 0.45 M NaOH solution to neutralize 235 mL of an HCl ... 2). You are titrating an acid into a base to determine the concentration of the base. The endpoint of the neutralization is reached but the stopcock on the buret sticks slightly ... 5). It takes 12.5 mL of a 0.30 M HCl solution to neutralize 285 mL of NaOH ...
Explanation:
The equation for photon energy, E, is E=hcλ where h = 6.626×10−34 J⋅s (Planck's constant) and c = 2.99×108 m/s (the speed of light). What is the wavelength, λ, of a photon that has an energy of E = 4.61×10−19 J ?
Answer:
9.133×10^-6 m
Explanation:
A photon is the smallest discrete amount or quantum of electromagnetic radiation. It is the basic unit of all light. Photons are always in motion and, in a vacuum, travel at a constant speed to all observers of 3 x 10^8 m/s.
From the question, the following details were supplied;
Energy of the photon (E) = 4.61×10^−19 J
Speed of light (c) = 2.99×10^8 m/s
Plank's constant (h) = 6.626×10^−34 J⋅s
Wavelength of the photon (λ)= ??? The unknown
From
E=hc/λ
λ= hc/E
Substituting values
λ= 6.626×10^−34 × 2.99×10^8/ 4.61×10^−19
λ= 91.33×10^-7 m
λ= 9.133×10^-6 m
What type of reaction is shown below? Check all that apply. 2Mg+O2—> 2MgO
Answer:
Reaction types are :
Combination(Mg and O combine)Oxidation (O added to Mg)Exothermic (light and heat released)Answer:
Synthesis and Combustion
Explanation:
For edge
Earthquakes occur along the San Andreas Fault in California. Which
statement best describes plate motion in that area during the time between
earthquakes?
a. Plate motion stops; stress and potential energy between the plates
decrease.
b. Plate motion continues; stress and potential energy between plates
increase.
C. Plate motion stops; only the mantle moves.
d. Plate motion reverses; plates return to their original positions.
in some communities forest are cleared through burning in the deforested and is used for farming which of these is negative consequences of this practice
Explanation:
High emission of CO2 which is bad and the wild animals which live in that spot will flee, thus that place will eventually lose much more ecological diversity.
which statement correctly describes a scienfic theory
Answer:
B) It is based on repeated investigations.
Explanation:
If this is your question:
Which statement correctly describes a scientific theory?
A) It is accepted as true indefinitely.
B) It is based on repeated investigations.
C) It is equivalent to a scientific law.
D) It is accepted as false.
Which resources MAY be used by autotrophs to make their food?
1. oxygen
2. glucose
3. soil
4. carbon dioxide
5. hydrogen sulfide
(A) 1 and 2
(B) 2 and 3
(C) 3 and 4
(D) 4 and 5
Answer:
The answer is C.
Explanation:
Plants get minerals from the soil and take in carbon dioxide from the air to photosynthesize in order to make their food .
The resources that may be used by autotrophs to make their food are soil and carbon dioxide. The (C) 3 and 4
Who are autotrophs?Autotrophs include algae, plants, certain bacteria, and fungi. Autotrophs are the food chain's producers because they make their own energy and nutrients. Like the majority of autotrophs, kelp produces energy through a process known as photosynthesis.
Photosynthesis, the method used by plants and other autotrophic organisms to make food, converts carbon dioxide into glucose and oxygen, both of which are vital for life.
Soil gives nutrition and water to the plant and water is used in the process of photosynthesis and carbon dioxide is also used in the process.
Therefore, the correct option is (C) 3. Soil and 4. Carbon dioxide.
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4. What kept the concept of continental drift from originally being
accepted?
Answer:
The fact that there was no driving force or motive mechanism behind the theory of continental drift.
Explanation:
The concept of continental drift was first proposed by Abraham Ortelius in 1596, and further improved on by Alfred Wegener in 1912. The theory proposes that the earth's continents have moved across the ocean bed. The continents also move with geologic time relative to each other. The concept was not accepted by scientists because there was no driving force or motive mechanism to explain the theory.
A scientist named Alfred Holmes, came up with the mantle convection theory which explains that the slow motion of the earth was caused by convection currents. This explanation was still not satisfactory to scientists. Today, the theory of plate tectonics has gained more acceptance than the theory of continental drift.
A gas has a pressure of 25 atm at 303 K . What is the temperature if the pressure drops to 20 atm?
Answer: But Thats Aight
Explanation: 301
e
Coal and petrol are called non-renewable sources of energy,why
Answer:
because they take thousands or even millions of years to naturally replenish or replaced , which is not the average human lifetime
Which shows how nuclear chemistry can help you during the closure
Answer:
Most nuclear fuels contain heavy fissile actinide elements that are capable of undergoing and sustaining nuclear fission. The three most relevant fissile isotopes are uranium-233, uranium-235 and plutonium-239
Explanation:
Why do you think adding water (dilution) changes how acidic or basic the liquid is? Explain your thinking.
Answer:
Diluting an acid reduces the concentration of the H+ ions that cause acidity, while diluting a base reduces the concentration of the OH- ions that cause basicity.
Explanation:
The pH scale covers a range between 0 and 14 pH. A pH of exactly 7 is neutral. pH values greater than 7 are basic, while pH values less than 7 are acidic. The pH scale is logarithmic with a base of 10, meaning each integer pH value is 10 times more acidic or basic than the one preceding or succeeding it respectively. For dilution to decrease the acidity or basicity of a solution, the solvent being used must be less acidic or basic than this solution.
Alternatively, an acidic diluent may be used to dilute a basic solution, or vice versa, in a neutralization reaction. Because of the logarithmic nature of the pH scale, diluting a strong acid or base even slightly causes its respective pH to rise or drop considerably. Weak acids and bases with pH values close to 7 are correspondingly not as affected by dilution.
Dilution decreases the amount of acid or base molecules in the liquid thereby making the liquid less acidic or basic.
How basic or acidic a liquid is has to do with the amount of solute present in the liquid.
Note that the liquid is actually a solution. The acid or base was dissolved in water and two scenarios are possible;
Amount of water greater than the amount of acid or base, in which case the solution is diluteAmount of acid or base greater than amount of water, in which case the solution is concentrated.The more the amount of acid or base present, the more acidic or basic the liquid is.
So, if I add more water in such a way that amount of water exceeds the amount of acid or base present in the liquid, the liquid is now less acidic or basic because it contains less acid or base molecules compared to water molecules.
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A planet's orbit around the sun affect's the planet's ability to support life
true
false
Answer:True i believe
Explanation:
Based on their number of valence electrons, which group of elements will gain two electrons by bonding with other atoms?
Question 1 options:
Be, Mg, Ca, Sr, Ba
F, Cl, Br, I, At
O, S, Se, Te, Po
N, P, As, Sb, Bi
Answer:
O, S, Se, Te, Po
Explanation:
Oxygen, sulphur, selenium, tellurium and polonium are all members of group sixteen. The elements in group sixteen all possess six electrons in their outermost shell. Recall that an atom is said to stable if it contains eight electrons in its outermost shell. This is also referred to as the octet rule. Hence atoms of elements obey the octet rule when they combine to form compounds with eight electrons present on the outermost shell of each atom.
Having six electrons on their outermost shell implies that they need to gain two electrons by bonding to other atoms of other elements. Two examples will suffice here.
Water is formed when an oxygen atom shares an electron with each hydrogen atoms.
Hydrogen sulphide is formed when sulphur share two electrons with two hydrogen atoms. Hence the answer.
Answer:
O, S, Se, Te, Po
Explanation:
Hello,
In this case, when chemical bonds are formed, the valence electrons are the bridge to make it possible, nevertheless, the octet is the limit for the formation of bonds, that is, an element must not exceed 8 shared or gained electrons. In such a way, elements able to gain to electrons to attain the octet are those from the VIA group: O, S, Se, Te, Po, as they have six valence electrons, so two more electrons are suitable for attaining the octet.
Best regards.
If the volume of a gas, at constant temperature, changes from 200 ml to 500 ml, the pressure on the gas must have changed from 400 torr to ____________.
Answer: 160 torr
Explanation:
To calculate the new pressure, we use the equation given by Boyle's law. This law states that pressure is directly proportional to the volume of the gas at constant temperature.
The equation given by this law is:
[tex]P_1V_1=P_2V_2[/tex]
where,
[tex]P_1\text{ and }V_1[/tex] are initial pressure and volume.
[tex]P_2\text{ and }V_2[/tex] are final pressure and volume.
We are given:
[tex]P_1=400 torr\\V_1=200mL\\P_2=?\\V_2=500mL[/tex]
Putting values in above equation, we get:
[tex]400torr\times 200ml=P_2\times 500mL\\\\P_2=160torr[/tex]
Thus the pressure has changed to 160 torr
In a neutral solution, the concentration of H+ is
Answer:
1 x 10^-7 or 7
Explanation:
pH=-log(H+)
pH+pOH=14
Look at the following diagram of the carbon cycle.
An image of carbon cycle is shown. The sun, a cloud, two trees, one on the left and the other on the right, an animal, lake, and a factory are shown in the image. An arrow is shown from the sun towards the left tree marked A. The sun is marked B. There is an arrow from the air above the clouds, marked C, towards the left tree. An arrow from a location close to the ground marked D points towards Dead Organisms, which is a label under the animal. An arrow marked E points from the right tree straight up to the clouds. An arrow marked F points from the animal straight up to the clouds. An arrow marked G points from the factory towards the air above the clouds, C. There is an arrow pointing from the air to the lake labeled Carbonates in Water, an arrow pointing down from dead organisms to Fossils and Fossil Fuels, and an arrow from Fossils to the factory.
Which of the following statements best explains what happens at Location F?
Group of answer choices
The energy stored in atmospheric carbon dioxide is conserved because it is transformed into glucose during photosynthesis.
The energy stored in atmospheric carbon dioxide is conserved because it is used to create new forms of energy present in decomposed plants.
The energy consumed by animals in the form of glucose is conserved because it is used to create new forms of energy present in decomposed animals.
The energy consumed by animals in the form of glucose is conserved because it is transformed into chemical energy as carbon dioxide is produced during respiration.
Answer:
The energy consumed by animals in the form of glucose is conserved because it is transformed into chemical energy as carbon dioxide is produced during respiration.
Explanation:
There's no diagram....but I kinda figured it from the description.
The best explain at location F is the energy consumed by animals in the form of glucose is conserved because it is transformed into chemical energy as carbon dioxide is produced during respiration.
How glucose used in respiration?During aerobic cellular respiration, glucose reacts with oxygen, forming ATP ( Adenosine triphosphate) that can be used by the cell. Carbon dioxide and water are created as byproducts. The overall equation for aerobic cellular respiration is: In cellular respiration, glucose and oxygen react to form ATP ( Adenosine triphosphate)
Adenosine triphosphate is an organic compound which gives energy to living organisms to drive many operations in living cells such as muscle contraction, muscle pumps, nerve impulse propagation, condensate dissolution, and chemical synthesis.
Therefore, the best explain at location F is the energy consumed by animals in the form of glucose is conserved because it is transformed into chemical energy as carbon dioxide is produced during respiration.
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Convert 11.03 moles of calcium nitrate to grams.
Answer:
1809.9 Grams of Calcium Nitrate
Explanation:
Calcium Nitrate Ca(NO3)2
Molar Mass: 164.086g/mol
Given: 11.03 mol of Ca(NO3)2 x 164.086g/mol = 1809.9 Grams of Calcium Nitrate
Mole is used to measure the tiny substances such as atoms and molecules. 11.03 moles of calcium nitrate weights 1809.9 grams.
The formula to calculate the mass of the substance,
[tex]\bold {w = m \times n}}[/tex]
Where,
w - mass
m - molar mass = 164.086 g/mol
n - number of moles = 11.03 moles
put the values in the formula,
[tex]\bold {w = 164.086 \times 11.03 }}\\\\\bold {w = 1809.9}[/tex]
Therefore, 11.03 moles of calcium nitrate weights 1809.9 grams.
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if the force is 200N and 5m/2 whats the pressure
Answer:
To answer your question one must look at Pascal's relationship between force, area, and Pressure.
Explanation:
[tex]P=\frac{F}A[/tex]
So we take what I assume is area:
[tex]A= 5\text{m}^2[/tex]
And I know is force:
[tex]F=200\text{N}[/tex]
So simply divide them:
[tex]P=\frac{200\text{N}}{5\text{m}^2}[/tex]
Giving you:
[tex]P = 40 \text{pascal}[/tex]
So the right answer is 40 Pascal.
look at the attached picture
Hope it will help you
Good luck on your assignment
What is the condensed formula for 2-pentyne??
Answer:
C5H8
Explanation:
The condensed formula is also known as structural formula of a chemical compound which shows a graphical representation of the molecular structure that represents, the arrangement of the atoms in the three-dimensional space.
The condensed formula of 2-pentyne is C5H8.
There is a triple bond between two carbon atoms at second carbon as shown in the figure.
how many grams of manganese(III)
oxide would be produced from the
complete reaction of 46.8 g of zinc?
Answer:113
Explanation:let me know if it is right
According to stoichiometry and reaction which produces manganese(III) oxide 134.24 g would be produced from the complete chemical reaction of 46.8 g of manganese.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
According to the chemical reaction,of oxidation of manganese and as per stoichiometry,54.93 g manganese produces 157.87 g manganese(III) oxide so ,46.8 g of manganese will produce 46.8×157.87/54.93=134.24 g.
Thus, 134.24 g of manganese(III) oxide would be produced from the complete reaction of 46.8 g of manganese.
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This makes nooooooooooooooooooooooooooooooooooooooooooooooooooooo sense
largest electronegativity element
Answer:
Fluorine (F)
Explanation:
As you move to the right across the periodic table, the electronegativity increases. As you move up a group, the electronegativity increases.
This means that the most electronegative element is fluorine.
Which is an example of a beneficial mutation? ANSWERRRR HELPPP !!!
choices : one that changes the color of a rabbit, allowing it to hide from predators.
one that results in lighter flower petal colors without changing the plant’s ability to reproduce
one that causes a person’s body to produce thick mucus that clogs the lungs
one that makes it easier for a corn plant to contract a disease
Answer:
A
Explanation:
Mutation can be defined as the change in the genetic sequence that is hereditary. The example of beneficial mutation can be the change of rabbit color to help him hide from the predators.
What are mutagens?The mutation can be caused by the exposure of the gene sequence to the mutagen that cause the hereditary change.
The mutagens can be UV radiation, high energy, radiation, chemicals, or environmental factors.
The beneficial mutation can be given as the mutation in which the organism has been benefitted. The change in the color pf rabbit benefit him in hiding from the predators. Thus, option A has been the example of the beneficial mutation.
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describe the light spectrum of a star
Answer:
The visible light spectrum is the section of the electromagnetic radiation spectrum that is visible to the human eye. Essentially, that equates to the colors the human eye can see. It ranges in wavelength from approximately 400 nanometers (4 x 10 -7 m, which is violet) to 700 nm (7 x 10 -7 m, which is red).
(Hope this helps) Sky
3. A wave has y frequency of 100 Hz and a speed of 50 m/s. What is the wavelength?
Answer:
0.5 m
Explanation:
a rock that can float if placed in water
Answer:
Anything that has less density than water will float on water.
Explanation:
Come on! It's basic knowledge!
if 600.0 ml of air is heated from 293 k to 333 k what volume will it occupy
Answer:
Explanation:
V1= 600.0 mL
T1= 293 K
V2 unknown
T2= 333K
Charles law V1*T2=V2*T1
where V1 and T1 are the initial volume and temperature. V2 and T2 are the final temperature and volume.
V2=(V1*T2)/T1 = ( 600.0*333)/293= 682 mL (with significant figures)(681.911 mL before signifcant figures.)
If anyone is good at figuring out the amount of heat released in chemistry PLS HELP!!!!!
Answer:
Option (3) 334J.
Explanation:
The following data were obtained from the question:
Mass (m) = 1g
Heat of fusion (ΔHf) = 334J/g
Heat (Q) =?
The heat released can be obtained as follow:
Q = m·ΔHf
Q = 1 x 334
Q = 334J.
Therefore, the heat released when 1g is converted to ice is 334J.
HELPPP ... short response
In your own words, explain how mass is conserved in a chemical reaction
Answer:
Matter cannot be created or destroyed in chemical reactions.
Explanation:
Matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions
Answer:
Mass is conserved in chemical reactions because the atoms are just rearranged. Any atoms of an element that you have in the reactants is still there in the products, just combined differently with other atoms. The mass of an atom is the same before and after the reaction, so the total mass of the reactants and products is equal.
Explanation:
Got the question right on an assignment
What is the concentration of hydronium ion in a 0.121 M HCl solution?
A) 1.0 M
B) < 0.121 M
C) 0.121 M
D) not enough information
Answer:
C) 0.121 M
Explanation:
HCl + H₂O = H₃O⁺ + OH⁻
.121M .121M
HCl is a strong acid . It will dissociate almost 100 % so the concentration of acid and hydronium ion formed will be equal . It is to be noted that hydronium ion is formed due to association of H⁺ and H₂O . H⁺ is formed due to ionisation of HCl .
So concentrtion of hydronium ion ( H₃O⁺ ) will be .121 M.