A factor which helped to first drive plants to live on land is: A. greater access to sunlight on land.
The chemical reaction for photosynthesis.In Science, photosynthesis is a light-dependent process and it is typically represented by the following chemical reaction:
Carbon dioxide + water + light energy ⇒ sugar + oxygen
Based on the chemical reaction above, we can infer and logically deduce that light energy (sunlight) obtained from the Sun is a very important factor for photosynthesis.
Consequently, greater access to sunlight on land became a factor which helped to first drive plants to live on land.
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Answer:
it is A step by step
Explanation:
Please help me? I am not understanding any of this
Answer:
Hydrogen
Explanation:
These are what hydrogen isotopes look like
Plsss helpssssssssSSS
Mechanical waves require a medium (matter) in order to travel, an example is _____________. Electromagnetic waves do not need a medium to travel and an example is ____________ A) light; sound B) sound; light C) air; space D) space; solid
Answer:
The answer is B. sound; light
Explanation:
Water and sound waves are mechanical and require a medium in order to travel. Light and radio waves are not mechanical but rather electromagnetic and do not need a medium.What kind of waves do light waves travel in and how do they move
Which of the following organisms have chlorophyll in their cells?
algae
green plants
some bacteria
all of the above
Answer:
all of the above
Explanation:
chlorophyll in found in virtually all photosynthetic organisms
A storage tank contains n, o, and co2. The partial pressure of n and o gas are 600 torr and 150 torr. The total pressure is 825 torr. What is the partial pressure and mole fraction of co2?
The partial pressure of carbon dioxide is 75 torr.
What is Dalton's theory?Dalton's theory of gas states that total pressure of the mixture of gas sample is equal to the sum of the partial pressure of all the gases present in that sample.
Given that,
Total pressure of mixture = 825 torrPartial pressure of Nitrogen = 600 torrPartial pressure of oxygen = 150 torrPartial pressure of carbon dioxide = ?On putting values, we get
Partial pressure of carbon dioxide = 825 - (600 + 150) = 75 torr
Hence Partial pressure of carbon dioxide is 75 torr.
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Niels Bohr adapted the nuclear model.
Describe the change that Bohr made to the nuclear model.
Answer:
To remedy the stability problem, Bohr modified the Rutherford model by requiring that the electrons move in orbits of fixed size and energy.
An aqueous solution contains the following ions: cl−, ag , pb2 , no−3, and so2−4. More than one precipitate will form. Identify the precipitates
An aqueous solution contains the following ions Cl⁻, Ag⁺, Pb²⁺, NO₃⁻ & SO₄²⁻ and more than one precipitate will form are AgCl, PbCl₂, PbSO₄ & Ag₂SO₄.
What is precipitate?Precipitate is the insoluble compound which is present at the bottom of any chemical reaction in the solid state.
If in an aqueous solution Cl⁻, Ag⁺, Pb²⁺, NO₃⁻ & SO₄²⁻ ions are present then:
Compounds AgCl, PbCl₂, PbSO₄ & Ag₂SO₄ are not soluble in water as it is present in the form of precipitate.Pb(NO₃)₂ is fully soluble in water and will not make precipitate.Hence precipitates are AgCl, PbCl₂, PbSO₄ & Ag₂SO₄.
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Select the correct structure that
corresponds to the name.
3,3-dimethylcyclopentene
A. CH3,
B
CH3
C. both
CH3
CH3
Please help me asap!!
Answer:
B
Explanation:
The naming of the compound is given by IUPACNumbering of the carbon atoms start from the double bondThe methyl groups lie at the 3rd positionHence, its name will be :3,3 - dimethylcyclopentaneOption B shows the correct structureCarbon-14 has a half-life of 5,730 years. How long will it take for 112. 5 g of a 120. 0-g sample to decay radioactively? 5,730 years 11,460 years 17,190 years 22,920 years.
The time taken by Carbon-14 to decay radioactively from 120g to 112.5g is 22,920 years.
How do we calculate the total time of decay?Time required for the whole radioactive decay of any substance will be calculated by using the below link:
T = (n)(t), where
t = half life time = 5730 yearsn = number of half life required for the decayInitial mass of Carbon-14 = 120g
Final mass of Carbon-14 = 112.5g
Left mass = 120 - 112 = 7.5g
Number of required half life for this will be:
1: 120 → 602: 60 → 303: 30 → 154: 15 → 7.54 half lives are required, now on putting values we get
T = (4)(5730) = 22,920 years
Hence required time for the decay is 22,920 years.
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what whould happend if humans used all the fossil fuels on the earth
There are several things that would happens,if all of the fossil fuels were used.The most important is in bold,but I made a quick list below to note.<3
The biggest affects would be that humans would have to find other sources of energy in order to survive. An increase of renewable as well as nuclear energy will be used in order to help build back society.-War Would Break Out
-The Earth's Climate Would Be Far From Safe & Would Cause A Huge Decrease In Population
-A Huge Portion Of The World Would Be Living In Poverty
-Failing Economies
-A Worthless Planet
-Also want to not that it is almost impossible to run out of fossil fuels, but if we do,it won't be thousands of years in the future.
I HOPE THIS HELPS! & and good luck on your assignment.
SO2+02➡SO3
balance chemical equation
Answer:
2S02 + O2 ---> 2SO3
Its balanced now as Reactants = Products.
Consider the reaction hc2h3o2(aq) h2o(l) → h3o (aq) c2h3o2–(aq). Which species is the conjugate acid?a. C2h3o2-(aq)b. H2o(l)c. H3o (aq)d. Hc2h3o2(aq)e. Two of these
The species that is the conjugate acid is HC₂H₃O₂(aq). The correct option is d.
What are conjugate acid?Conjugates acids are those acids which are made when an acid donates a proton to a base according to Bronsted Lowry theory.
In other words, we can say that it is an acid with hydrogen ion. An example is water (base) reacting with an acid to form the hydronium ion (conjugate acid).
Thus, the correct option is d, HC₂H₃O₂(aq).
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Name the factors that liquefy atmospheric gas depend
Atmospheric gases can be liquefied by applying pressure and lowering temperature.
Alpha Centauri IS
star that is about the same size as the IS Sun. John is using tennis balls to model how the Sun and Alpha
Centauri appear from Earth. He places one tennis ball one meter to his right to model the Sun. He places another tennis ball ten
meters to his left to model Alpha Centauri.
What does John notice about the tennis ball that is ten meters to his left?
es
It looks wider than the other tennis ball.
BI
It looks smaller than the other tennis ball
It looks different in color than the other tennis ball
It looks different in shape than the other tennis ball
Answer:
it looks smaller for sure ^_^
8Li2S --> 16Li +S8 how many moles of Li would be produced when 5 moles of Li2S react?
Answer:
10moles
Explanation:
mole ratio = 8:16
therefore
1 mole Li2S forms 2 moles Li
when 5 moles Li2S reacts
5 moles Li2S = 5 x 2 moles Li
= 10 moles Li
Which periodic trend quantifies the amount of energy required to remove an electron from a neutral, gaseous atom?.
Ionization energy refers to the amount of energy needed to remove an electron from an atom. Ionization energy decreases as we go down a group. Ionization energy increases from left to right across the periodic table.
What is ionization energy?
Ionization is the process by which ions are formed by the gain or loss of an electron from an atom or molecule.
Ionization energy is defined as the energy required to remove the most loosely bound electron from a neutral gaseous atom.
When we move across a period from left to right then there occurs a decrease in atomic size of the atoms. Therefore, ionization energy increases along a period but decreases along a group.
Smaller is the size of an atom more will be the force of attraction between its protons and electrons. Hence, more amount of energy is required to remove an electron.
Thus, we can conclude that the energy required to remove an electron from a gaseous atom is called ionization energy.
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Why did the Marshall Plan include aid for the defeated Axis powers?
Question
Answer:
One of the purposes of the Marshall Plan was to aid nations in economic recovery from WWII.
Explanation:
The Marshall Plan aided the defeated Axis powers because that's one of the reasons it was created, The Marshall Plan was supposed to rehabilitate the economies of the 17 western and southern European countries in order to create stable conditions for democracy to continue.
16. How many moles of aluminum are needed to react completely with 1.2 mol of FeO?l
2 Al (s) + 3 FeO (s) → 3 Fe (s) + Al₂O, (s)
a. 1.2 mol
0.8 mol
c. 1.6 mol
d. 2.4 mol
A sample of helium gas is
sealed in a container with a lid
that can be moved up and down.
Select all of the following that will result in an increase in pressure inside the container.
A. Decreasing volume
B. Increasing volume
C. Decreasing temperature
D. Increasing temperature
E. Adding one more mole of helium gas
F. Removing one mole of helium gas
P=nRT/V
P ≈ 1/V = decreasing volume
P ≈ T = increasing temperature
P ≈ n = adding one more mole of helium
CHEMISTRY PLS HELPPP
Which of the following molecules is optically active?
A. 3,3-dichloropent-1-ene
B. Butan-1-ol
C. 2-methylbutane
D. 2-bromopropanoic acid
Answer:
D
Explanation:
2-bromopropanoic acid is optically active because it contains chiral carbon bonded with 4 different atom ( CH3,H,COOH,Br).
Name these compounds according to IUPAC. (ASAPP)
The IUPAC name of the compound is propanal and acetone.
What is propanal and acetones?Propanal is also called propanaldehyde, and it is an aldehyde which has one double bond and oxygen.
Acetone is a ketone. Ketones have functional group of R2CO.
Thus, the IUPAC name of the compound is propanal and acetone.
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4 pt
Question 6
(05.06 LC)
The actual yield of a product in a reaction was measured as 2.80 g. If the theoretical yield of the
product for the reaction is 3.12 g, what is the percentage yield of the product? (4 points)
82.7%
85.2%
87.3%
89.7%
89.74% is the percentage yield of the product. Hence, option D is correct.
What is the meaning of percentage?The percentage can be calculated by dividing the value by the total value and then multiplying the result by 100.
Given data:
Actual yield of product = 2.80 g
Theoretical yield = 3.12 g
Percent yield = ?
Formula:
Percent yield = [tex]\frac{\;actual \;yield \;X \;100}{theoretical \;yield}[/tex]
by putting values in the formula,
Percent yield =[tex]\frac{2.80 g X 100}{ 3.12 g}[/tex]
Percent yield = 89.74%
Hence, option D is correct.
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When the temperature and number of particles of a gas are constant, which of the following is also constant?
a. the product of the pressure and volume
b. the sum of the pressure and volume
c. the ratio of the pressure and volume
d. the difference of the pressure and volume
What is the maximum mass of ethyl alcohol you could boil with 1000 j of heat, starting from 20°c?
The amount of maximum mass of ethyl alcohol that could we boil with 1000 J of heat, starting from 20°C is 7.08 grams.
How do we calculate the mass?Mass of the ethyl alcohol will be calculated by using the below equation as:
Q = mcΔT, where
Q = absorbed heat = 1000 Jm = mass of ethyl alcohol = ?c = specific heat of ethyl alcohol = 2.42 J/g.°CΔT = change in temperature = (78.37°C - 20°C) = 58.37°COn putting all these values, we get
m = 1000 / (2.42)(58.37) = 7.079 = 7.08g
Hence required mass of ethyl alcohol is 7.08grams.
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How many formula units of silver fluoride, AgF, are equal to 42.15 g of this substance?
Hurry please.
2.05 × 10²³ formula units
Given data:Mass of AgF = 43.15 gNumber of formula units = ?Solution:Number of moles of AgF:Number of moles = mass/ molar massNumber of moles = 43.15 g/ 126.87 g/molNumber of moles = 0.34 molNow Number of formula units will be determine by using Avogadro number.It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.The number 6.022 × 10²³ is called Avogadro number1 mole = 6.022 × 10²³ formula units0.34 mol × 6.022 × 10²³ formula units2.05 × 10²³ formula units
If 70 grams of nitrogen gas will dissolve in a liter of solution at 1 atm of external
pressure. If the pressure is increased to 3 atmospheres, what would the solubility be?
Answer: Empirical formula, CH; Molecular formula, C2H2
Explanation:
Solid potassium fluorine gas → solid potassium fluoride balanced
The balanced symbol equation for Solid potassium fluorine gas → solid potassium fluoride is 2 K + F₂ → 2 KF ⁻.
What is a balanced equation?The reactants are on the left side of the arrow in a balanced equation, while the products are on the right.
The moles in a compound are indicated by the number in front of the chemical formula. Subscripts indicate the number of atoms in a single molecule (numbers below an atom).
Thus, the balanced equation is 2 K + F₂ → 2 KF ⁻.
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Find the minimum energy needed to eject electrons from a metal with a threshold frequency of 5. 65×1014 s−1
3.745 x [tex]10^{-19}J[/tex] is the minimum energy needed to eject electrons from a metal with a threshold frequency of 5.65 x [tex]10^{14}s^{-1}[/tex]
What is threshold frequency?The minimum frequency needed to cause electron ejection is referred to as the threshold frequency.
The energy carried by the incident light is E=hf
Where h is the Planck constant and f is the frequency of the light. The threshold frequency is the frequency that corresponds to the minimum energy needed to eject the electrons from the metal, so if we substitute the threshold frequency in the formula, we get the minimum energy the light must have to eject the electrons:
E=hf
h=6.63 x [tex]10^{-34}Js[/tex]
f=5.65 x [tex]10^{14}s^{-1}[/tex]
E=6.63 x [tex]10^{-34}Js[/tex] x 5.65 x [tex]10^{14}s^{-1}[/tex]
E= 3.745 x [tex]10^{-19}J[/tex]
Thus, 3.745 x [tex]10^{-19}J[/tex] is the minimum energy needed to eject electrons from a metal with a threshold frequency of 5.65 x [tex]10^{14}s^{-1}[/tex]
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how is energy involved in phase changes ?
Answer: It is either through the addition of energy by heat and the transition to a more energetic state or from the removal of energy by heat and the transition to a less energetic state.
Explanation:
Answer:
During phase changes, matter changes from one phase to another one, either through the addition of energy by heat or transmission or the removal of energy with the same process.
Explanation:
