Answer:
[tex]1 \: mole = 6.02 \times {10}^{23} \: molecules \\ 4 \: moles = (4 \times 6.02 \times {10}^{23} ) \: molecules \\ = 2.408 \times {10}^{24} \: molecules[/tex]
Ecosystems involve interactions between biotic and abiotic factors. Using one or more complete sentences name two abiotic and two biotic factors that might make up an ecosystem.
Answer:
Examples of biotic factors in an ecosystem are plants and animals
Examples of abiotic factors in an ecosystem include sunlight and type of soil
Explanation:
An ecosystem is a self-supporting unit composed of living and non living parts. Materials and energy flow within the ecosystem.
The ecosystem is composed of living and nonliving parts which affect each other in very significant ways.
The biotic factors of the ecosystem are the living factors such as plants and animals.
The abiotic factors are the nonliving factors of the ecosystem such as sunlight and type of soil.
Who is my favourite wrestler?
Answer:
ma herdina thesto wrestling
Chemical A and Chemical B react in an exothermic reaction. What can be known about what will happen when Chemical A and Chemical B are mixed together?
The new substance will need more energy to form its chemical bonds than the old substance will release.
More energy will be released from the old substance than the new substance will need to form its chemical bonds.
The color will change as a result of the reaction.
The substance will bubble as a result of the reaction.
Answer:
B
Explanation:
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
Which part of the Earth system contains most of the planet's mass?
Answer:
Geosphere of the Earth system contains most of the planet's mass.
Explanation:
One of the most important is the Carbon Cycle since all of the organisms on Earth are carbon-based life forms. includes all water on the surface of the earth oceans, lakes, rivers, aquifers, and ice. 70% of the earth's surface is covered with water.
14. Each beaker shown to the right contains iron and an
acid. In which beaker will the iron dissolve the fastest
and why?
a. Beaker A because of a higher concentration level.
b. Beaker A because of increased surface area.
C. Beaker B because of a higher concentration level.
d. Beaker B because of increased surface area.
The question is incomplete, the complete question is attached in the image below:
Answer: The correct option is D) Beaker B because of the increased surface area.
Explanation:
A solution consists of solute and solvent.
A solute is defined as a component that is present in a smaller proportion while a solvent is defined as a component that is present in a larger proportion.
Solubility is defined as the amount of solute that can be dissolved in a given amount of solvent to form a solution.
Solubility of a substance depends on a few factors:
Surface areaMolecular sizeTemperatureStirring effectFor the given images,
Beaker A has a large block of iron rod and Beaker B has iron shards.
The smaller molecular size of a substance increases its surface area and thus, increases the solubility.
Hence, the correct option is D) Beaker B because of the increased surface area.
. Calculate the pH and the pOH of each of the following solutions at 25 °C for which the substances ionize completely:
(a) 0.200 M HCl
(b) 0.0143 M NaOH
(c) 3.0 M HNO3
(d) 0.0031 M Ca(OH)2
Based on the molarity of the solutions;
For 0.200 M HCl; pH = 0.699, pOH = 13.301For 0.0143 M NaOH; pOH = 1.845, pH = 12.16For 3.0 M HNO3; pH = -0.4771, poH = 14.4771For 0.0031 M Ca(OH)2; pOH = 2.21, pH = 11.79What pHand pOH?pH is the negative logarithm to base ten of the hydrogen ions concentration of a solution.
pH = -log[H+]pOH is the negative logarithm to base ten of the hydroxide ions concentration.
pOH = -log[OH-]Also;
pH + pOH = 14For HCl:
pH = -log [H3O+]
pH =-log (0.200)
pH = 0.699
Then;
poH= 14-0.699
pOH = 13.301
For NaOH:
pOH= -log [OH-]
= -log (0.0143)
pOH = 1.845
Then;
pH= 14-poH
= 14- 1.845
pH = 12.16
For HNO3:
pH= -log[H3O+]
=-log(3.0)
= -0.4771
Then;
pOH = 14-9-0.4771
pOH = 14.4771
For [Ca(OH)2]
molarity = 0.0031M
2 moles of OH- are produced
[OH-]= 2 × 0.0031
[OH-] = 0.0062M
pOH = - log[OH-]
=-log(0.0062)
=-log(6.2x10-3)
=-(-2.21)
pOH = 2.21
Then;
pH =14-2.21
pH =11.79
Learn more about pH and pOH at: https://brainly.com/question/13557815
Which equation represents the correct net ionic equation for the reaction between Ca(OH)2 and H2SO4?
Upper H superscript plus, plus upper O upper H superscript minus right arrow upper H subscript 2 upper O.
2 upper H superscript plus, plus 2 upper O upper H superscript minus right arrow upper H subscript 2 upper O.
Upper C a superscript 2 plus, plus 2 upper O upper H superscript minus, plus upper S upper O subscript 4 superscript 2 minus right arrow upper C a superscript 2 plus, plus upper S upper O subscript 4 superscript 2 minus, plus 2 upper H subscript 2 upper O.
Upper C a (upper O upper H) subscript 2 plus upper H subscript 2 upper S upper O subscript 4 right arrow upper C a upper S upper O subscript 4 plus 2 upper H subscript 2 upper O.
Answer: The equation Upper H superscript plus, plus upper O upper H superscript minus right arrow upper H subscript 2 upper O represents the correct net ionic equation for the reaction between [tex]Ca(OH)_{2}[/tex] and [tex]H_{2}SO_{4}[/tex].
Explanation:
An ionic equation is defined as the equation where both reactants and products are present in the form of ions.
For example, ionic equation between [tex]Ca(OH)_{2}[/tex] and [tex]H_{2}SO_{4}[/tex] is as follows.
[tex]Ca^{2+} + 2OH^{-} + 2H^{+} + SO^{2-}_{4} \rightarrow Ca^{2+} + SO^{2-}_{4} + 2HOH[/tex]
Cancelling the spectator ions then net ionic equation will be as follows.
[tex]2H^{+} + 2OH^{-} \rightarrow H_{2}O[/tex]
Thus, we can conclude that the equation Upper H superscript plus, plus upper O upper H superscript minus right arrow upper H subscript 2 upper O represents the correct net ionic equation for the reaction between [tex]Ca(OH)_{2}[/tex] and [tex]H_{2}SO_{4}[/tex].
How did reducing the number of
decomposers affect the amount of carbon
dioxide in the ecosystem?
Answer:
As organisms release energy during cellular respiration, carbon dioxide is produced from the carbon in energy storage molecules. ... Carbon dioxide in the biodome decreased because decomposers decreased which means there was a decrease in cellular respiration overall.
btw :
stay safe! :3
Which of the following methods can be used to identify the suspected use of heat lamps in a house without entering the house?
A. Identify the lamps inside the house using x−ray machines.
B. Detect the heat emitted by the lamps using infrared rays.
C. Use special cameras to emit ultraviolet light that can detect the heat lamps.
D. Capture the images of lamps inside the house using radars that send radio wave signals.
Answer:
b I see some of ask you to do it
Answer:
B. Detect the heat emitted by the lamps using infrared rays.
Explanation:
I.
Look at the pictures below. What can you say about them?
Describe their similarities and differences. Write your answer in
your notebook
Www
cowo
Politics
SXO
is
Answer:
Hey , I can't see the picture
describe how water molecules can hydrate various substances
Answer:
A water molecule can react with the carbonyl group of an aldehyde or a ketone to form a substance known as a carbonyl hydrate, as shown in the first reaction below. The carbonyl hydrates usually form a very small percentage of the molecules in a sample of a specific aldehyde or ketone.
(Nice profile pic also UwU)
round 5,239 to 2 significant figures
Answer:
5240
Explanation:
I'm not sure tho sorry
Please help I’ll give brainliest
REACTION TYPE:
Single displacement/Oxidation-reduction
(Hope this helped UwU)
Answer:
Synthesis reaction is the answer
can someone check if i did this right. thank you !!
Answer:
noo
Explanation:
its basic
....................
Answer: acidic
Explanation:
Which do you think has more mass, 1 mole of fructose, 1 mole of sucrose or 1 mole of aspartame? Explain your reasoning.
Answer:
i think they would be all the same
Explanation:
they sound like sugars
12. Which nonmetal is the most reactive?
A bromine
B
iodine
C) fluorine
D) chlorine
Answer:
C Fluorine
Explanation:
Cuantos segundos hay en un año solar (365.24)
Answer:
31556736
Explanation:
During nuclear fission and fusion, what is matter that seems to disappear actually converted into?
mass
energy
volume
nuclei
is para-dichlorobenzene an ionic, covalent or metallic bond?
I think there are a bond??
Answer:
it is covalent
hope this helps!
add me as a friend if you can:)
The complete balanced equation for the reaction between barium hydroxide and acetic
acid is
Answer:
2 CH3COOH + Ba(OH)2 --> Ba(C2H3O2)2 + 2H2O
To make it less clustered, you can use Ac for C2H3O2.
2 HAc + Ba(OH)2 --> Ba(Ac)2 + 2H2O
The acetic acid reacts with the base barium hydroxide to form the salt barium acetate and water.
Explanation:
final answer. C
Produces helium, a safe noble gas
O Fission
O Fusion
Answer:
Nuclear fission power plants have the disadvantage of generating unstable nuclei; some of these are radioactive for millions of years. Fusion on the other hand does not create any long-lived radioactive nuclear waste. A fusion reactor produces helium, which is an inert gas.
Which of the following is an example of nuclear fission?
A. A gamma emitter is used to trace movement of chemicals in the
environment.
B. A radioactive drug that emits electrons is used to treat cancer in a
patient.
O c. Two different isotopes of hydrogen form an isotope of helium on
the sun.
O D. A large radioactive atom breaks into smaller atoms, producing
nuclear energy.
The statement which is an example of nuclear fission is that a large radioactive atom breaks into smaller atoms, producing nuclear energy.
What is nuclear fission?Nuclear fission is a kind of radioactive decay reaction in which an unstable nuclei of an atom will split into smaller stable nuclei by the emission of lots of energy.
Gamma emitter is used inside the human body to trace the information that assists in making a diagnosis by the help of medication.To treat cancer patient high energetic rays like x-rays, gamma-rays are used.Formation of isotope of helium from two different isotopes of hydrogen is an example of nuclear fussion reaction.Hence in nuclear fission a large radioactive atom breaks into smaller atoms, producing nuclear energy.
To know more about nuclear fission, visit the below link:
https://brainly.com/question/3992688
An element X has the proton number 18.
The next element in the periodic table is an element Y.
Which statement is correct?
Answer:
This question is incomplete
Explanation:
This question is incomplete. However, the element X with the atomic number of 18 is Argon (Ar) while the next element (element Y) in the periodic table, with atomic number 19, is potassium (K).
Element X is found in the group zero (also called group 18 and elements found therewith are referred to as noble gases) of the periodic table while element Y is found in group 1 (elements found here are referred to as alkali metals).
Element X has a completely filled outermost shell while element Y has one electron in its outermost shell.
Element X is a metal while element Y is a nonmetal.
Please help down below I'll give brainliest
Answer: plastic conduces heat
Explanation:Plastics are excellent insulators, meaning they can efficiently trap heat — a quality that can be an advantage in something like a coffee cup sleeve. ... The new polymers, which are lightweight and flexible, can conduct 10 times as much heat as most commercially used polymers
what is periodic law
Which of the following is a non polar molecule ?
N2 is non polar because electronegative of both the atoms are same and N2 also have linear shape
Two solutions are mixed, bringing together ions of Na+, PO43−, V3+, and Cl−. Use the solubility rules to identify the composition of the salt that precipitates out of the solution.
28.0 g of N2 gas was found to occupy a volume of 8.44 L at a
pressure of 320 kPa. What is the temperature of the gas?
Are there options for this question? ...........
Answer:
Therefore, the temperature of the gas is 84.9 ℃. 28.0 g of N2 gas was found to occupy a volume of 8.44 L at a pressure of 320 kPa.
Explanation:
Therefore, the temperature of the gas is 84.9 ℃. 28.0 g of N2 gas was found to occupy a volume of 8.44 L at a pressure of 320 kPa.
(PLEASE HELP 20 POINTS)
4.2 moles of an unknown gas at a pressure of 5.5 atm has a volume of 12.0 L.
What is the temperature?
Answer: The temperature of the unknown gas is 191.4 K.
Explanation:
To calculate the temperature of the gas, we use ideal gas equation which is given as:
[tex]PV=nRT[/tex] .......(1)
Where
P = pressure of the gas = 5.5 atm
V = volume of gas = 12.0 L
n = number of moles = 4.2 moles
R = Gas constant = 0.0821 L.atm/mol.K
T = temperature of the gas = ?
Putting values in equation 1:
[tex]5.5atm\times 12.0L=4.2mol\times 0.0821L.atm/mol.K\times T\\\\T=\frac{5.5atm\times 12.0L}{4.2mol\times 0.0821L.atm/mol.K}\\\\T=191.4K[/tex]
Hence, the temperature of the unknown gas is 191.4 K.
Để trung hoà 20ml dung dịch HCl 0.1M cần 10ml dung dịch NaOH nồng độ x mol/l . Giá trị của x là
The question is: To neutralize 20ml of 0.1M HCl solution, 10ml of NaOH solution of concentration x mol/l is required. What is the value of x?
Answer: The value of x is 0.2 M.
Explanation:
Given: [tex]V_{1}[/tex] = 20 mL, [tex]M_{1}[/tex] = 0.1 M
[tex]V_{2}[/tex] = 10 mL, [tex]M_{2}[/tex] = x
Formula used is as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}\\0.1 M \times 20 mL = x \times 10 mL\\x = 0.2 M[/tex]
Thus, we can conclude that the value of x is 0.2 M.
