Answer:
Selection, in biology, the preferential survival and reproduction or preferential elimination of individuals with certain genotypes (genetic compositions), by means of natural or artificial controlling factors.
Explanation:
Hope it helps you
A person with a mass of 105 kg moves at a velocity of 1.5 m/s what is this person momentum?
Answer:
225kg.m.s
Explanation:
Momentum equals to mass times velocity
refers to the way in which atom bond with each other
Answer:
Atoms have a central nucleus with positively charged protons and neutral neutrons; negatively charged electrons circle the nucleus. The electrons that are involved in chemical bonding are those electrons in the outermost orbit, referred to as valence electrons.
Explanation:
Chemical bond refers to the way in which atom bond with each other
What is chemical bond?A chemical bond is a form of attraction or bond that exist between atoms, ions or molecules. This bond allows the formation of chemical compounds.
The bond can be as a result of electrostatic force of attraction.
Therefore, Chemical bond refers to the way in which atom bond with each other
Learn more on Chemical bond here,
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Kinetic energy increases as________?
Answer:
THE 1st one
Explanation:
Convert 4.00 moles of carbon to grams
Answer:
As you know 1.00 moles of carbon to grams 12.0107
4.00 moles of carbon to grams is 48.0428
The molecular formula for Carbon is C. The SI base unit for amount of substance is the mole.
Explanation:
I Hope it help youQuestion 8 of 10
What is R in the ideal gas law equation?
A. The kinetic energy of the gas
B. The number of moles of the gas
C. The molar mass of the gas
D. The ideal gas constant
SUBMIT
Answer:
D
Explanation:
The ideal gas law is: pV = nRT, where n is the number of moles, and R is universal gas constant. The value of R depends on the units involved, but is usually stated with S.I. units as: R = 8.314 J/mol·K
Large areas on the leaves of some plants lack chlorophyll and are therefore not green in color. How does this most likely affect photosynthesis?
Not enough sunlight is captured in these areas of the leaves.
Carbon dioxide cannot enter these areas of the leaves.
Too much glucose builds up in these areas of the leaves.
Oxygen cannot be released in these areas of the leaves
Answer:
Not enough sunlight is captured in these areas of the leaves.
Explanation:
Photosynthesis is the process whereby green plants manufacture their food using carbon dioxide and water in the presence of sunlight.
The sunlight is the energy source which drives this chemical change or reaction.
Therefore, to capture the sunlight, the green pigment called chlorophyll is needed. Without this sunlight, photosynthesis will not take place. Photosynthesis is a light dependent reaction. Without light, the process is greatly hampered
Which statement correctly compares electric charge with electric current?
A.They both require a human to make them.
B.Neither require charged particles.
C.They both require a battery and a bulb.
D.They both require a movement of charged particles.
Answer:
A. They both require a human to make them.
Explanation: The main difference between current and charge: Current: It is the rate of flow of charge (generally electrons). Current (I) is the physical quantity measured in amperes (A). Charge: It is the deficiency or excess of electrons on a body surface.
Determine the formula for iron l oxide
The Quantum Mechanical model of electrons within an atom says______________
Answer:
See explanation
Explanation:
According to the wave mechanical model of the atom, electrons in the atom exhibit wavelike properties.
Unlike in Bohr's model where electrons were believed to be found in orbits of specified energy, electrons are found in orbitals which are defined as regions in space within which there is a high probability of finding an electron in accordance with the Heisenberg uncertainty principle.
An orbital is described by four sets of quantum numbers.
Name the method that is used to separate cream and skim milk from each other
Answer:
the separator is a centrifugal device that separates milk into cream and skimmed
I hope it helps you
3rd law of thermodynamics..
2 Different Examples((Thnks))
Answer:
See explanation
Explanation:
The third law of thermodynamics states that "the entropy of a perfect crystal of a pure substance approaches zero as the temperature approaches zero" (Wikipedia).
One example of the third law of thermodynamics has to do with steam. Steam is gaseous water. Since it is a gas, its molecules are free to move around therefore its entropy is high. When the temperature of the steam is decreased below 100 degrees, the molecules of steam loose energy and turn into liquid water and do not move as freely as they did in the gaseous state. If the temperature is further decreased to yield ice at zero degrees, the molecules of water are "frozen" in their positions and the entropy of the system decreases to zero.
Also, the ions in ionic crystal solids move around when the substance is in solution or in molten state hence the substance conducts electricity. When the ionic substance is in solid state, the ions do not move about and the entropy of the solid system tends towards zero.
A Sedentary lifestyle is a way of life that includes a lot of physical activity true or false?
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Q26. Aqueous sodium oxalate (C204)2- and aqueous lead (II) nitrate react to product solid
lead (II) oxalate and aqueous sodium nitrate.
3.
I need Balanced chemical equations
Na₂C₂O₄(aq) + Pb(NO₃)₂⇒PbC₂O₄(s) + 2NaNO₃(aq)
Further explanationGiven
Word equation
Required
Balanced equation
Solution
Convert to skeleton equation
Na₂C₂O₄(aq) + Pb(NO₃)₂⇒PbC₂O₄(s) + NaNO₃(aq)
Balanced equation
Give a coefficient
Na₂C₂O₄(aq) + aPb(NO₃)₂⇒bPbC₂O₄(s) + cNaNO₃(aq)
Make an equation
C, left = 2, right =2b⇒2b=2⇒b=1
Na, left = 2, right = c⇒c=2
O, left = 4+6a, right = 4b+3c⇒4+6a=4b+3c⇒4+6a=4.1+3.2⇒6a=6⇒a=1
The equation becomes :
Na₂C₂O₄(aq) + Pb(NO₃)₂⇒PbC₂O₄(s) + 2NaNO₃(aq)
How many moles of carbon dioxide are formed when 32 moles of oxygen gas are consumed?
CH4(g) + 2O2(g) --> CO2(g) + 2H2O(g)
Answer:
16 mol CO2
Explanation:
Answer:
16 mol CO2
Explanation:
Based on the energy requirements or generation, reactions can be classified as either endothermic or exothermic. The reactions which need energy to proceed are known as endothermic reactions. The reactions in which energy is released are known as exothermic reactions. In other words, energy is supplied to endothermic reactions and is obtained from exothermic reactions.
The given reaction is:
CH_4 (g) + 2O_2 (g) -> CO_2 (g) + 2H_2O (g)
Here, methane reacts with oxygen to generate carbon dioxide and water.
The binding energy of a molecule is defined as the difference between energy of that molecule and its elements (in their ground state). The binding energy of the various species used in this reaction are:
methane: -75 kJ/mol
oxygen: 0
carbon dioxide: -394 kJ/mol
water: -242 kJ/mol
Thus, we can see that the formation of products will release more energy than reactants. We can also calculate the energy change when this reaction takes place.
Energy change = binding energy of products - binding energy of reactants
= -394 + 2 x (-242) - (-75) + 2 x 0 = -803 kJ/mol
negative sign indicates that the energy is released.
Thus, this reaction is exothermic and generates 803 kJ of energy per mole.
Hope this helps.
organic acids are weaker than inorganic once it is true or false
Answer:
false
Explanation:
What happens during the process of a cellular respiration?
Answer:
During cellular respiration, a glucose molecule is broken down into carbon dioxide and/or water.
Answer:
respiration is a process of gaining. energy and it use a row material like oxygen and glucose and the products will be ATP(energy), ethanol, CO2 the cellular part which is responsible for this is mitochondria, please this process is involved by yeast
If I have one mole of sulfur, how many atoms would that be?
Answer:
Atoms of sulfur = 9.60⋅g32.06⋅g⋅mol−1×6.022×1023⋅mol−1
Explanation:
because the units all cancel out, the answer is clearly a number, ≅2×1023 as required.
PLZZZ HELP I NEED ANSWER ASAP THE FIRST ANSWER GETS BRAINLIEST
How is thermal energy transferred from Earth's core?
Through the absorption of water heated by the sun
Through convection that takes place in the atmosphere
Through conduction from magma to water and rocks
Through the sun's radiation that heats the ground
Answer:through the conduction from magma to water and rocks
Explanation:
what did you include in your response?
check all that apply
Answer: i don't know
Explanation:
u gave no information on what you're asking
PLEASE HURRY
Which of the following is a subsurface event that takes place during the rock cycle?
Deposition
Erosion
Weathering
Plate tectonics
Answer:
Option D, Plate Tectonics
In the rock cycle, surface events takes place at the surface of earth. Thus,
weathering and erosion are surface events, while the subsurface events he take place in the deeper section of the earth . Examples of sub surface events are plate tectonics and mountain building or anything that takes place in the inner core of earth.
Explanation:
Answer:
Option D, Plate Tectonics
In the rock cycle, surface events takes place at the surface of earth. Thus,
weathering and erosion are surface events, while the subsurface events he take place in the deeper section of the earth . Examples of sub surface events are plate tectonics and mountain building or anything that takes place in the inner core of earth.
Explanation:
Option D, Plate Tectonics
In the rock cycle, surface events takes place at the surface of earth. Thus,
weathering and erosion are surface events, while the subsurface events he take place in the deeper section of the earth . Examples of sub surface events are plate tectonics and mountain building or anything that takes place in the inner core of earth.
burning methane in air is an exothermic reaction
true
false
Answer:
Hydrocarbon fuels like methane (CH4) burn in the presence of oxygen to produce carbon dioxide and water. This process of combustion releases energy. When energy is released during the course of a chemical reaction, it is said to be an EXOTHERMIC reaction. The combustion of of methane gas releases 50.1 kJ/g.
true
The burning of methane in the presence of air is an exothermic reaction. The given statement is true.
Exothermic Reaction:
The chemical reaction in which heat energy is released during the reaction.
For example- the burning of 1 mole of methane in the air releases 810 kJ of heat energy.
[tex]\bold {CH_4 +2O_2 \rightarrow CO_2 + 2H_2 O}\ \ \ \ \ \ \ \bold{\Delta H = 810\ kJ}[/tex]
Therefore, the burning of methane in the presence of air is an exothermic reaction.
To know more about Exothermic Reactions:
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Which subatomic particle has a negative charge?
1 Proton
2 Electron
3 Neutron
Answer:
2 Electron is the required answer
what produces energy from sugar through chemical reactions it can also called the PowerHouse of cell??
Answer:
Mitochondria are known as the powerhouses of the cell. They are organelles that act like a digestive system which takes in nutrients, breaks them down, and creates energy rich molecules for the cell. In cellular respiration sugar with the help of oxygen is broken down into ATP (energy molecule).
Fe2(SO4)3 +__BaCl2 → __BaSO4 +_
FeCl3
Answer:
Fe2(SO4)3 + 3BaCl2 → 2FeCl3 + 3BaSO4
S-L Line
760
L-G Line
LIQUID
PRESSURE OF THE SUBSTANCE mm Hg
380
SOLID
58
GAS
-S-G Line
O'c
100°C
TEMPERATURE OF THE SUBSTANCE
S-L Line: Line showing conditions in which solid
and liquid phases are in equilibrium.
L-GLine: Line showing conditions in which liquid
and gas phases are in equilibrium
S-G Line: Line showing conditions in which solid
and gas phases are in equilibrium
What is the approximate vapor pressure when the gas condenses at 80'C?
200
05
760
430
what are the 2 characteristics of fluids♂️
I think that you should use your phone
All of the devices below either use or produce electrical energy. Which one converts mechanical energy to electrical energy?
battery
electric drill
wind turbine
electric guita
Answer:
C- Wind turbine
Explanation:
Answer:
its c wind turbine
Explanation:
2. Put the following steps of scientific inquiry in order, please number 1‐3.
_______Make an observation
_______ Ask a question
_______ Form a hypothesis
Answer:
1. Ask a question
2. form a hypothesis
3. Ask a question
Explanation:
how does the concentration of sodium thiosulphate affect the rate of reaction in between hydrochloric acid and sodium thiosulphate
Answer: C
Explanation:
I know because i did it.
If I fill a balloon with helium it will float. Why does it float? Estimate the mass of helium in the balloon.
Answer:
It only makes objects float if they are less dense than their surroundings, like a boat on water, or a helium balloon in air. Buoyancy works due to displacement. ... In the case of a balloon, the helium inside the balloon weighs less than the same volume of air the balloon displaces
Explanation:
Answer:
In the case of a balloon, the helium inside the balloon weighs less than the same volume of air the balloon displaces. ... So a helium balloon has two opposing forces acting on it: gravity pulling it down, and buoyancy pushing it up. Buoyancy wins, so you can't really weigh a balloon, even though it does have weight.
Knowing the volume of air displaced by the helium balloon, we can calculate the maximum mass the balloon can lift. ... Helium, which has a mass of 4.00 g/mol, has a density of 0.164 g/l. Thus, a one-liter balloon of helium can lift a mass of (1.18-0.164) = 1.02 g.