Animals need various nutrients in order to live and grow. Nitrogen, for example, is a nutrient that is needed to form molecules found in genetic material. How do animals obtain nitrogen? A. They eat plants which have absorbed nitrogen from the soil. B. They create nitrogen in their bodies using other nutrients as building blocks. C. They breathe in and absorb nitrogen gas from the atmosphere. D. all of these
Answer:
It's A
Explanation:
Animals get the nitrogen they need by eating plants or other animals that contain nitrogen. When organisms die, their bodies decompose bringing the nitrogen into soil on land or into ocean water. Bacteria alter the nitrogen into a form that plants are able to use.
Which of the following best describes what happens when hydrogen and oxygen to form water?
Atoms are changing place with other atoms
Hydrogen and oxygen are undergoing change of states.
Hydrogen and oxygen are stable condition
Atoms are combining to form molecules
Atoms are combining to form molecules
How many molecules are in 10 moles of H2
The number of molecules in one mole of hydrogen gas is 6.02 × 10²³ . The number of molecules in 10 moles of hydrogen gas is then 6.022 ×10²⁴.
What is one mole?Any substance that contains 6.022 × 10²³ number of atoms is called ne mole of that substance. This number is called Avogadro number. Hence, one mole of every elements contains Avogadro number of atoms.
Hydrogen is the first element in periodic table. It is an alkali metal. The number of molecules in one mole of H₂ is equal to Avogadro number. Mass of a molecule with one mole of amount is called its molecular mass.
Number of molecules of H₂ in one mole = 6.02 × 10²³
Then number of molecules in 10 moles is Avogadro number times the number of moles.
= 10 × 6.022 × 10²³ = 6.022 ×10²⁴ molecules
Therefore, 10 moles of H₂ contains 6.022 ×10²⁴molecules..
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Does the temperature of the solvent (water) affect the rate of dissolving?
Cuantos gramos de nitrato de potasio (KNO3) son necesarias para preparar 800ml de solucion al 12 % m/v
Answer:
96 g
Explanation:
Tomando en cuenta que estamos hablando de una solución de Nitrato de potasio cuya concentración es 12% m/V, debemos entonces usar la expresión de %m/V:
%m/V = msto / Vsol * 100 (1)
De esta expresión, debemos despejar la masa de soluto (msto) que es precisamente el valor que estamos buscando. Al hacer el despeje tenemos:
msto = %m/V * Vsol / 100 (2)
Ahora solo nos queda sustituir los valores dados y resolver:
msto = 12 * 800 / 100
msto = 96 g de KNO₃Espero te sirva.
Does the following compound contain a polyatomic ion? NH4NO3
Answer:
Yes
Explanation:
what is the barycenter of the moon and the earth
Answer:
The barycenter is the point in space around which two objects orbit. For the Moon and Earth, that point is about 1000 miles (1700 km) beneath your feet, or about three-quarters of the way from the Earth's center to its surface.
Explanation:
A student uses eight chocolate sandwich cookies to model the Moon's phases. The student separates each cookie and removes frosting to show how the Moon looks at each phase. How would the student create the Waning Gibbous phase?
The link below is a picture of the "Waning gibbus" phase, really hope that it helps you out :D
acid+base->salt+water
What type of reaction is this?
Answer:
The reaction of an acid with a base is called a neutralization reaction. The products of this reaction are a salt and water.
Answer:
Neutralization reaction
Explanation:
Neutralization reaction it the reaction of acids and bases that form salt and water
hope it's helpful ❤❤❤❤
THANK YOU.
A bathtub is half full of warm water. How could the
thermal energy of the water be increased? Check
all that apply.
Answer: A. B and C
Explanation:
I'm pretty sure this is right....
Have a great day :)
Answer: It is A,B. and C.= Add hot water to the tub.
Heat the water in the tub without adding more water.
Add more water at the same temperature to the tub.
Explanation: I got it correct.
Which describes an example of ecological succession?
Answer:
b. a meadow replacing a pond in it's flood plain
Explanation:
I'ts a secondary succession.
If Jorge wanted to measure the distance between the Sun and the closest star to it, which unit should he use? no guessing
kilometer
meter
astronomical unit
light year
Answer:
i think kilometer or light year
Explanation:
which part of the plant you think is the least important?
Answer:
Well maybe the pedals they don't help much
Explanation:
Answer:
brainliest please
Explanation:
the pollen probably because other plants have it
PLEASE HELP ME ILL GIVE BRAINLIEST
Answer:
TRUE :)
Explanation:
blood is pumped through the pulmonary artery to the lungs, where it picks up oxygen and releases carbon dioxide.
Answer:
False
Explanation:
it takes it to tha lungs.
There have been made 2 attempts of oxygen production by potassium permanganate.In the first attempt they have got 75ml oxygen in 3 minutes whearas there have been got 100ml in 5 minutes by the 2nd attempt.In what case the speed of the oxygen production is bigger???
Pls explain your answer
Answer:
The speed of oxygen production is bigger in the first attempt.
Explanation:
In the first attempt, since 75ml oxygen is produced in 3 minutes, the rate of oxygen production is r = volume of oxygen/time = 75 ml/3 min = 25 ml//min
In the second attempt, since 100ml oxygen is produced in 5 minutes, the rate of oxygen production is r' = volume of oxygen/time = 100 ml/5 min = 20 ml//min
Since r = 25 ml/min > r' = 20 ml/min, the speed of oxygen production is bigger in the first attempt.
What is a similarity between the respiratory and excretory systems?
A They both break down food.
B They both remove waste from the body.
C They both exchange gases within the body.
D They both transport nutrients throughout the body.
Answer:
B
Explanation:
The respiratory removes carbon, and the excretory removes other waste products
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What accounts for the fact that liquid mercury forms into tight beads while ethyl alcohol do not?
Answer:
Pretty sure this is wrong but worth a shot
Explanation:
Ethyl Alcohol is a clear, colorless liquid with a wine-like odor. It is used in alcoholic . Do not rely on odor alone to determine ... This chemical is on the Special Health Hazard Substance. Ethyl Alcohol can affect you when inhaled and by passing through the Ethyl Alcohol may form an ignitable vapor/air mixture in.
Element X has three electrons in its outermost orbit.
Element Y has seven electrons in its outermost orbit.
What is the chemical formula of the ionic compound
formed by these elements when they react together?
(Use X and Y as the chemical symbols.)
PLEASE SOMEONE EXPLAIN THIS IN DETAIL
Explanation:
element x _ carbon having two shells 2,3
element y _ fluorine atomic no 9 EC 2,7
when carbon react with fluorine it destroyes graphite and form fluorocarbons and thus form covalent bond
hope it helps u
What is the smallest unit found in a bar of gold. A. atom. B. Cell. C. Element. .D Nucleus PLEASE HELP
Answer:
c. element
Explanation:
Because gold is its own element, a gold bar is only made of one element.
The smallest unit found in a bar of gold is the nucleus of its atom. The core of an atom is called its nucleus which contains the nucleons protons and neutrons.
What is nucleus?An atom is composed of nucleons and electrons. The core of an atom is called its nucleus. Protons and neutrons are located inside the nucleus. They are called the nucleons.
The electrons are revolving around the nucleus through circular trajectories of fixed energies. Every elements are composed of their atoms. Atoms of different elements combine together to form compounds.
Gold is 79th element in periodic table. It is a transition metal in d-block. As every other elements the smallest unit are atoms where the atomic nuclei are even smaller units.
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what is Radio Waves and its defonation
Answer:
radio waves are the sound waves that are produces by a radio
Explanation:
if you add 5 protons, 4 neutrons, and 3 electrons what is the net charge of the atom
HELP ASAP DUE IN 5 MINUTES
the second one i think, hope this helps
Answer:
a
Explanation:
What does the difference in force depend on?
Mechanical energy is the total amount of and energy in a system. science
Answer:
Hey do you know if "horsleyjaydyn" is a girl you commented once she was a guy so
Explanation:
Does anyone know this?
Answer:
Not balanced. There are different number of atoms on each side of equation.
Explanation:
Given balanced chemical equation:
Chemical equation:
3C₂H₄ + 3O₂ → 4CO₂ + 6H₂O
The equation is not balanced because umber of moles of C, H and O are not balanced. It consist of six moles of C, 12 moles of H and six moles of oxygen on left side of equation while on right side there are 4 moles of C fourteen moles of oxygen and twelve moles of hydrogen present.
Balanced chemical equation:
C₂H₄ + 3O₂ → 2CO₂ + 2H₂O
Now the equation became balanced. There are two moles of carbon, four moles of hydrogen and six moles of oxygen are present on both side of equation.
Please help (: List and describe the locations and conditions in the Four zones of a lake
Explanation:
littoral horizantal raw curated
The half-life of cobalt-69 is 6 years. How much of a 5-gram sample is left after 12 years
Answer:
that was wrong my bad. just delete my answer
Explanation:
How many moles of solute are in 250 mL of 2.0 M CaCl2? How many grams of CaCl2 is
this?
Answer:The solution contains 0.50 mol or 55 g of CaCl2 . You know there are 2.0 mol of CaCl2 in 1 L of solution. (40.08 + 2 × 35.45) g=(40.08 + 70.90)
g=110.98 g
Explanation:
My I please have brainliest
110.98 grams of CaCl₂ is there present in 2.0 M CaC₂.
What is calcium chloride?Calcium chloride is made up of calcium and chloride.
Given, that the solution contain 250 mL of 2.0 M CaCl2
You know there are 2.0 mol of CaCl2 in 1 L of solution.
(40.08 + 2 × 35.45) g
= (40.08 + 70.90)
=110.98 g
Thus, 110.98 grams of CaCl₂ is there present in 2.0 M CaC₂.
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PLEASE HELP I don’t know how to do this
Moles of Iron : 1.01
Further explanationGiven
Reaction
Fe2O3 + 3CO → 2Fe + 3CO2
34 liters of CO
Required
moles of Iron
Solution
Assumed at STP
Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters / mol.
so for 34 L :
= 34 : 22.4
= 1.518 moles
From the equation, mol Fe :
= 2/3 x moles CO
= 2/3 x 1.518
= 1.01 moles