The diagram below shows the sequence of events and processes which resulted in the origin of life on Earth.Picture shows a flow chart with a rectangle labeled non-living matter at the top, an oval labeled chemical processes below it, and a rectangle labeled A at the bottom.
Which of these events best fits the box labeled A?
A.destruction of cells
B.appearance of bacteria
C.creation of primitive plants
D.transformation of atmosphere
Answers
The rectangle A at the bottom will represent the appearance of bacteria as shown in the attached figure below. Therefore, option (B) is correct.
What is the origin of life on earth?
In biology, the origin of life can be described as the natural process by which life has arisen from non-living matter. The prevailing scientific hypothesis can be described as that the transition from non-living matter to living entities was not a single event.
An evolutionary process that can be involved in the formation of a habitable planet, is the prebiotic synthesis of organic molecules, molecular self-replication autocatalysis, and the emergence of cell membranes.
The study of abiogenesis or the origin of life objectives to determine how pre-life reactions gave origin to live under conditions different from those on Earth today. It uses tools from the fields of biology and chemistry, with recent approaches attempting a synthesis of many sciences.
Therefore, the flow charge will be like living matter → Chemical processes → the appearance of bacteria.
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The event that best fits the box labeled A is appearance of bacteria. The answer is letter B
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Answers
Answer: 0.1 km
Explanation:
1) Multiply the rate (speed) by the time: 2 cm / year × 5,000 year = 10,000 cm
2) Convert cm to km, using these well know conversion factors:
1 km = 1,000 m
1 m = 100 cm
⇒ 10,000 cm × [1 m / 100 cm] × [1 km / 1,000 m] = 0.1 km
Answers
The 2AI + 6HCL = 2ALCL3 + 3H2. of the 3.0 gms of H2 are made.
- The values derived from the grams of H2 in production can be used for finding the molar mass of AI of 27.
- AI will react and make a 26.8 g of AI as molar mass consists of AI = 27 g / ml and the M of the H2 = 2.0g/ mol gms.
- The calculated M of grams is 26.8 rounded to 3g figures.
Learn more about the 2AI + 6HCL = 2ALCL3 + 3H2.
Answer:
its actually 26.8 rounded to three sig figs
Explanation:
ur welcome
Answers
ΔG = ΔH – TΔS < 0
For a spontaneous reaction to occur, ΔG must be negative. Following the equation, ΔH must be < 0, and ΔS must be > 0 for a reaction to be spontaneous at all temperatures. However, the given values have a negative value for both enthalpy and entropy. This means that spontaneity can only occur below a certain temperature, which can be calculate by setting ΔG as zero. This gives:
ΔG = ΔH – TΔS = 0
T = ΔH/ΔS = -50/-0.3 = 166.67 Kelvin
Anything below that temperature gives a negative ΔG, making it spontaneous.
Final answer:
The reaction is spontaneous at temperatures greater than 166.7 K.
Explanation:
To determine the temperature at which the reaction is spontaneous, we can calculate the Gibbs free energy change (ΔG) using the equation ΔG = ΔH - TΔS, where ΔH is the enthalpy change and ΔS is the entropy change. Since the reaction is spontaneous below a certain temperature, we can assume that at this temperature, ΔG is negative. Thus, we have -50.0 kJ - T(-0.300 kJ/K) < 0. Solving for T, we find that the reaction is spontaneous at temperatures greater than 166.7 K.
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There is constant cosmic background radiation.
B.
Galaxies are moving toward each other.
C.
A loud explosion can be heard in the radio frequencies everywhere in the universe.
D.
Hydrogen and helium are the most abundant elements in the universe.
Answers
Answers
Answer: 9.13g NO
Explanation:
First, I list what I know, which is the values of STP, the volume, the constant R, and the molar mass of NO; I also include what I'm looking for, which is n, the number of moles of NO.
STP = 273.15K, 1 atm
P = 1 atm
V = 6.82L
R = 0.0821 L*atm/mol*K
T = 273.15K
n = ?
NO mass: 30.01 g/mol
Then, I use the ideal gas law, PV = nRT, to find the number of moles of NO:
(1 atm)(6.82 L) = n()(273.15K)
(1 atm)(6.82 L) = n()
(1 atm)(6.82 L) / () = n => divided both sides by 22.4L*atm/mol
n = 0.304 mol NO
Then, I use the molar mass of NO, 30.01 g/mol, to convert from mol NO to g NO:
g NO = 0.304 mol NO()
= 9.13 g NO
I hope this helps! :)
Answers
Answer:
Ld₂Mz
General Formulas and Concepts:
Chemistry - Compounds
- Valence shells
- Writing chemical compounds
- Balancing charges
Explanation:
Step 1: Define
"Lindenium" Ld w/ oxidation charge of +1
"Mendezine" Mz w/ oxidation charge of -2
Step 2: Write Compound
To balance out the charges to be neutral (0), we must counter balance the amount of Ld's with Mz's. We need 2 Ld's with 1 Mz to create a compound with a neutral charge:
2Ld¹⁺ + Mz²⁻
2(+1) + (-2) = (+2) + (-2) = 0 (neutral charge)
Therefore, our compound must be Ld₂Mz.