Answer:
homeostasis
Explanation:
source Wiki
In biology, homeostasis (or “health”) is the state of steady internal, physical, and chemical conditions maintained by living systems. This is the condition of optimal functioning for the organism and includes many variables, such as body temperature and fluid balance, being kept within certain pre-set limits (homeostatic range). Other variables include the pH of extracellular fluid, the concentrations of sodium, potassium and calcium ions, as well as that of the blood sugar level, and these need to be regulated despite changes in the environment, diet, or level of activity. Each of these variables is controlled by one or more regulators or homeostatic mechanisms, which together maintain life.
The difference between a solid
and a gas is that
A. solids can change their volume but gases
cannot.
B. solids can take the shape of its container, and
gases cannot.
C. solids have high energy levels and gases have
low energy levels.
D. solids have low energy levels and gases have
high energy levels.
why seals and sea lions would not be considered fish.
Answer:
The word 'pinniped' means 'fin foot', as the four legs of seals, sea-lions and walrus have developed into flippers to better suit their life in the water. They are not fish! Even though a great part of their life is spent in the sea, pinnipeds are warm blooded air-breathing mammals known as marine mammals.
Explanation:
Sea lions (left) are brown, bark loudly, "walk" on land using their large flippers and have visible ear flaps. Seals have small flippers, wriggle on their bellies on land, and lack visible ear flaps. ... Both seals and sea lions, together with the walrus, are pinnipeds, which means "fin footed" in Latin.
To solve this we must be knowing each and every concept related to sea lions. Therefore, due to above given reason, seals and sea lions are not considered fish.
What is sea lions?Sea lions are curious creatures with sleek bodies that are playful as well as acrobatic in behavior. The species that can be found in aquariums and zoos the most frequently are California sea lions, who enthrall visitors with their antics. This captivating animal possesses a variety of extraordinary traits that are just amazing. Learn more about this sea lion by reading on.
Scaled fish have a cold blooded constitution. Their bodies are streamlined, and they breathe underwater. Fur covers seals and sea lions. They are warm blooded and breath air.
Therefore, due to above given reason, seals and sea lions are not considered fish.
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Lithium and nitrogen react in a combination reaction to produce lithium nitride:
6Li(s) + N_2(g) → 2Li_3N(s)
In a particular experiment, 1 00 g samples of each reagent are reacted. The theoretical yield of Iithium nitride is __________.
a. 5.0
b. 0.84
c. 1.01
d. 1.67
e. 2.50
Answer:
Option D. 1.67 g
Explanation:
The balanced equation for the reaction is given below:
6Li (s) + N₂ (g) → 2Li₃N (s)
Next, we shall determine the masses of Li and N₂ that reacted and the mass of
Li₃N produced from the balanced equation. This can be obtained as follow:
Molar mass of Li = 7 g/mol
Mass of Li from the balanced equation = 6 × 7 = 42 g
Molar mass of N₂ = 14 × 2 = 28 g/mol
Mass of N₂ from the balanced equation = 1 × 28 = 28 g
Molar mass of Li₃N = (7×3) + 14 = 21 + 14 = 35 g/mol
Mass of Li₃N from the balanced equation = 2 × 35 = 70 g
SUMMARY:
From the balanced equation above,
42 g of Li reacted with 28 g of N₂ to produce 70 g of Li₃N.
Next, we shall determine the limiting reactant. This can be obtained as illustrated below:
From the balanced equation above,
42 g of Li reacted with 28 g of N₂.
Therefore, 1 g of Li will react with =
(1 × 28)/42 = 0.67 g of N₂
From the calculation made above, we can see that only 0.67 g of N₂ out of 1 g given is required to react completely with 1 g of Li.
Therefore, Li is the limiting reactant and N₂ is the excess reactant.
Finally, we shall determine the theoretical yield of Iithium nitride, Li₃N.
The theoretical yield of Iithium nitride, Li₃N, can be obtained by using the limiting reactant as illustrated below:
From the balanced equation above,
42 g of Li reacted to produce 70 g of Li₃N.
Therefore, 1 g of Li will react to produce = (1 × 70)/42 = 1.67 g of Li₃N.
Thus, the theoretical yield of Iithium nitride, Li₃N is 1.67 g.
triarsenic pentasulfide what is the formula?
Answer:
As2S5
Explanation:
I hope this is the answer.
I
Graduated cylinder reading
Triple beam balance reading,
Work for the molar mass.
Work for the number of moles.
Convert graduated cylinder reading to L
Work for molarity.
Answer:
lhigygygigy
Explanation:
hyfgutfytifytftyfjgfhjfv
Uncontrolled energy:
A. Produces order
B.causes destruction
C. Can make things
D. Can do useful work
Answer:
B
Explanation:
uncontrolled energy damage the body
Answer: causes destruction
Explanation:
How many Joules are required to raise the temperature of 4.66 g of CCl4 from 20.9◦C to 76.8◦C?
The specific heat capacity of CCl4 is 0.856 J/g◦C.
Heat required to raise temperature : 224.02 J
Further explanationGiven
mass CCl4 = 4.66 g
Δt= 76.8 - 20.9 =55.9 °C
c = The specific heat capacity of CCl4 = 0.856 J/g◦C.
Required
Heat /energy required
Solution
Heat can be formulated
Q=m.c.Δt
[tex]\tt Q=4.66\times 0.86\times 55.9\\\\Q=224.02~J[/tex]
What are the types of ions and how are they formed?
Answer:
-Cations: They are formed by an atom losing an electron or electrons.
-Anions: They are formed by an atom gaining an electron or electrons.
Silver nitride is formed when a silver cation that has a 1+ charge combines with a nitrogen anion that has a 3- charge. Write the formula for the compound silver nitride.
The _____ time it takes to completely _____ food, the _____ the food will deteriorate.
less -- unfreeze -- more
more -- hydrate -- less
less -- freeze -- less
The answer is C.less -- freeze -- less
Oxygen is a __________ and nitrogen is a __________. metalloid, metalloid nonmetal, metal nonmetal, nonmetal nonmetal, metalloid metal, metalloid
Answer:
"nonmetal, nonmetal"
Explanation:
Oxygen is a non metal and Nitrogen is a non metal. It is 8th element of the periodic table. It is located in period 2 and group 16.
Nitrogen lies at the group 15 of the periodic table. Its atomic no is 7. Its valency is 2.
Hence, the correct option is (c) "nonmetal, nonmetal".
If the decomposition of a sample of KClO3 produces 3.29 g of O2 , what was the mass (g) of the original sample?
Answer: Thus 8.41 g was the mass of the original sample
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} O_2=\frac{3.29g}{32g/mol}=0.103moles[/tex]
[tex]2KClO_3\rightarrow 2KCl+3O_2[/tex]
According to stoichiometry :
As 3 moles of [tex]O_2[/tex] are produced by = 2 moles of [tex]KClO_3[/tex]
Thus 0.103 moles of [tex]O_2[/tex] are produced by =[tex]\frac{2}{3}\times 0.103=0.0687moles[/tex] of [tex]KClO_3[/tex]
Mass of [tex]KClO_3=moles\times {\text {Molar mass}}=0.0687moles\times 122.5g/mol=8.41g[/tex]
Thus 8.41 g was the mass of the original sample.
8.41 grams is the mass of original sample of KClO₃.
How we calculate mass from moles?Mass of any substance will be calculated from the moles as:
n = W/M, where
W = given or required mass
M = molar mass
Given chemical reaction is:
2KClO₃ → 2KCl + 3O₂
Given mass of O₂ = 3.29g
Moles of O₂ = 3.29g/16g/mole = 0.103 moles
From the stoichiometry of reaction, it is claer that:
3 moles of O₂ = produced by 2 moles of KClO₃
0.103 moles of O₂ = produced by 2/3×0.103 = 0.0687 moles of KClO₃
Now mass of KClO₃ = 0.0687 × 122.5g/mol = 8.41g
Hence, 8.41g is the mass of KClO₃.
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What is the shorthand electron configuration for CI?
Answer:
Since the 3s if now full we'll move to the 3p where we'll place the remaining five electrons. Therefore the Chlorine electron configuration will be 1s22s22p63s23p5. The configuration notation provides an easy way for scientists to write and communicate how electrons are arranged around the nucleus of an atom.
How many grams of sucrose must be dissolved in 250 ml to prepare the 0.15 mol / L solution?
Answer:
How could you prepare 250 mL of 0.20M NaCl using only a solution of 1.0M NaCl and water? To prepare a 250 mL 0.20 M NaCl solution, I would place 50 mL of the 1.0 stock solution to a 250 mL volumetric flask and then add 200 mL of water. A bottle of the antiseptic hydrogen peroxide (H2O2) is labeled 3.0% (v/v).
Please I need an answer
Uncontrolled energy:
A. Produces order
B. Causes destruction
C. Can make things
D. Can do useful work
Answer:
B: causees destrution
Explanation:
its right trust me
You have 5.00 L of 6.0 M KNO3. What volume does the solution need to be diluted to
for the concentration to be 0.1 M? Can anyone help me? ASAP
5. After undergoing 4 half-lifes what % of a 150 g sample of I-L-L will remain?
Answer:
6.25%
Explanation:
Given data:
Total sample = 150 g
Percentage remain after 4 half life = ?
Solution:
at time zero 150 g
At first half life = 150 g/2 = 75 g
At 2nd half life = 75 g/ 2 = 37.5 g
At 3rd half life = 37.5 g/2 = 18.75 g
At 3rd half life = 18.75 g/2 = 9.375 g
Percentage remain after 4 half lives.
9.375 g / 150 g × 100
0.0625 × 100
6.25%
ILL GIVE YOU A CROWN
Which farming method would mostly likely prevent soil erosion?
A.
contour plowing, to slow down water flow
B.
maximum tillage, to continually rotate topsoil
C.
planting one type of crop, to eliminate plant variety
D.
adding clay to the soil, to increase drainage
Answer:
A
Explanation:
18.2 mL of a 0.156 M solution of lead(II) nitrate are added to 26.2 mL of a 0.274 M solution of potassium iodide.
What is the mass of the Pbl2 precipitate formed in the reaction Pb(NO3)2 (aq) + 2 KI (aq) - Pbl2 (s) + 2 KNO3? The molar mass of Pbly is 461.0 g/mol.
Provide your answer in units of grams, with the correct number of significant digits. Enter your answer as a number only; do not include units.
The mass of the Pbl2 : 1308.87
Further explanationGiven
18.2 mL of a 0.156 M Pb(NO3)2
26.2 mL of a 0.274 M KI
Reaction
Pb(NO3)2 (aq) + 2 KI (aq) - Pbl2 (s) + 2 KNO3
Required
the mass of the Pbl2
Solution
mol Pb(NO3)2 = 18.2 x 0.156 = 2.8392 mlmol
mol KI = 26.2 x 0.274 =7.1788 mol
Limiting reactant Pb(NO3)2(smaller ratio of mol : reaction coeffiecient)
mol Pbl2 based on limiting reactant (Pb(NO3)2)
From equation, mol ratio of Pb(NO3)2 : Pbl2 = 1 : 1, so mol Pbl2=mol Pb(NO3)2=2.8392
Mass Pb(NO3)2 :
[tex]\tt mass=mol\times MW\\\\mass=2.8392\times 461\\\\mass=1308.87~grams[/tex]
What is the formula for hexaboron tetrabromide
Answer:
The formula for the compound isB6Br7
1.If you could look at the deep ocean floor, which is the best description of what you would see?
A. flat, silt-covered, lifeless regions
B. high mountains and deep valleys
C. ocean ridges with active volcanoes
D. coral reefs with many varieties of life
2.The section of a continent that lies just off the shoreline and extends beneath the ocean is called the continental ______.
A. plain
B. shelf
C. basin
D. ridge
please help <3
Answer:
Q1 D
Explanation:
Q2 C
A student wants to examine a substance without altering its composition. Which of the following describes a property of the substance that the student should examine?
Toxicity, because it can be observed by altering the state of the substance
Boiling point, because it can be observed by altering the state of the substance
Toxicity, because it can be observed by replacing the atoms of the substance with new atoms
Boiling point, because it can be observed by replacing the atoms of the substance with new atoms
Answer: Boiling point, because it can be observed by altering the state of the substance
Explanation:
Physical property is defined as the property of a substance which becomes evident during physical change in which there is alteration in shape, size etc. No new substance gets formed during physical change. Example: Melting point
Chemical property is defined as the property of a substance which becomes evident during chemical change in which a change in chemical composition takes place. A new substance is formed in these reactions. Example: Reactivity with other substances
Thus Boiling point is a propertywhich can be examined without altering the composition, because it can be observed by altering the state of the substance
According the equation: 2H,O+ electricity → 2H2 + O2
A) An electrolytic cell, because it absorbs energy.
B) A voltaic cell, because it releases energy. C) A voltaic cell, because it absorbs
energy.
D) An electrolytic cell, because it releases energy.
E) All of them
Answer:
A) An electrolytic cell, because it absorbs energy.
Explanation:
The major difference between an electrolytic cell and a voltaic cell is that, in an electrolytic cell, there must be input of energy from outside (a cell) to drive the non spontaneous reaction while in a voltaic cell, the reaction proceeds on its own and releases energy which could be harnessed to do work.
Hence, considering the equation; 2H2O+ electricity → 2H2 + O2 , energy is supplied as electricity in order for the process to take place. This is an example of an electrolytic cell.
Perform the following calculations and report each answer with the correct number of significant figures.
628 × 342 b. 5.45 – 2.3 c. 28.0/13.483
d. 14.98 + 27,340 + 84.7593
Answer:
a)215000
b) 3.2
c) 2.08
d) 27439.74
Explanation:
Significant figures:
When we add or subtract the values the number of significant figures after decimal in result must be equal to the given measurement having less number of decimal places.
b) 5.45 -2.3
3.2
d) 14.98 + 27,340 + 84.7593
27439.74
When we multiply or divide the values the number of significant figures must be equal to the less number of significant figures in given value.
a) 628 × 342
214776
we will round off this value into 3 significant figures.
215000
c) 28.0/13.483
2.08
which of the following can contaminate an aquifer?
A. All of these
B. landfills
C. agricultural regions
D. Animal feces
E. gas stations
Answer:
I think it is c
Explanation:
I'm sorry if I'm wrong had to look up aquifers
aquifer-a body of permeable rock which can contain or transmit groundwater
landfills, agricultural regions, and gas stations can contaminate an aquifer.
Aquifer:The aquifer is a layer of liquid rock beneath the earth. Underground water is contaminated by excavation and quarrying, increased fertilizer use, and septic tank leakage.
However, the construction of France does not contaminate subsurface water. Applied in various fields, ground-level structures with steps due to water storage are in rural places, it's used to store water.As a result, landfills, agricultural areas, and petrol stations contaminate an aquifer.Therefore, the correct choices are "Option B, Option C, and Option E".
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For the following reaction,use the identity of the alkyl halide and nucleophile to determine which substitution mechanism occurs.Then determine which solvent affords the faster reaction.
A) SN1,H2O
B) SN1,DMF
C) SN2,H2O
D) SN2,DMF
Answer:
a) SN1/H2O
b) SN1/CH3OH
c)SN2/DMF
d)SN2/HMPA
Explanation:
The reactions are shown in the image attached.
Let me restate the basic facts about SN1 and SN2 reaction mechanisms. SN1 reaction occurs by unimolecular mechanism and involves a carbocation, a poor nucleophile and a polar protic solvent.
An SN2 reaction is a bimolecular synchronous reaction that passes through a single transition state. It requires a good nucleophile and a polar aprotic solvent.
For reaction a and b, we observe that the alkyl halide is tertiary hence the reaction occurs by SN1 mechanism in the presence of a polar protic solvent.
Reactions c and d involves primary and secondary alkyl halides respectively and good nucleophiles. The best solvents to be used are polar aprotic solvents and the reaction follows SN2 mechanism.
what is the noble gas configuration for zirconium?
A. [Xe] 5s2 4d1
B. [Xe] 4d1
C. [Kr] 4d1
D. [Kr] 5s2 4d1
Answer:
[Kr] 4d² 5s²
Explanation:
g calculate the quantity of energy produced per gram of uranium 235 for the neutron induced Fusion of uranium
Answer:
Energy released by 1 g of U-235 = 7.603 * 10¹⁰ J
Explanation:
Uranium-235, U-235 undergoes neutron-induced fission to give the following products:
1 neutron + ²³⁵U --> ¹⁴¹Ba + ⁹²Kr + 3 neutrons
Masses of reactants and products:
neutron = 1.009 amu, uranium-235 = 235.044 amu, Ba-141 = 140.910 amu, Kr-92 = 91.910 amu
mass defect = mass of reactants - mass of products
mass defect = (235.044 + 1.009) - (140.910 + 91.910 + 3 * 1.009)
mass defect = 236.053 - 235.847 = 0.206 amu
1 amu = 1.6 * 10⁻²⁷ kg
Using E = mc²
E = 0.206 * 1.6* 10⁻²⁷ kg * (3 * 10⁸ m/s)² = 2.966 * 10⁻¹¹ J
therefore, 1 atom of U-235 releases 2.966 * 10⁻¹¹ J of energy
energy released by 1 g of U-235 can be calculated as follows:
1 mole or 253 g of U-235 contains 6.02 * 10³ atoms
1 g of U-235 will contain 6.02 * 10³/235 = 2.563 * 10²¹ atoms
Energy released by 1 g of U-235 = 2.563 * 10²¹ * 2.966 * 10⁻¹¹ J = 7.603 * 10¹⁰ J
PLEASE HELP Which of the answers below would be a correct chemical symbol of an element?
HG
hg
Hg
hG
Answer:
Hg
Explanation:
Hg is a correct chemical symbol of an element. Therefore, The correct option is option C among all the given options.
What is element?The quantity of protons an element has defines it. An element's atoms all contain the same amount of protons, but its electron and neutron counts might vary. Ions are produced by altering the electron to proton ratio, whereas isotopes are produced by altering the neutron count.
A material that cannot be destroyed chemically is referred to as a chemical element. Although chemical processes cannot modify an atom, nuclear reactions can create new elements. Hg is a correct chemical symbol of an element. A material that is not further decomposed either by chemical reaction is known as a chemical element.
Therefore, Hg is a correct chemical symbol of an element. The correct option is option C among all the given options.
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Which reaction is capable of breaking polypeptides into their component amino acids?
a. hydrogenation (adding hydrogen)
b. hydrolysis (adding water)
c. dehydrogenation (removing hydrogen)
d. dehydration (removing water)
Answer: B. Hydrolysis (adding water)
Explanation:
When peptide bonds join two or more amino acids together, this is refered to as a peptide. A polypeptide simply means several amino acids. We should also note that proteins contains polypeptides.
The reaction that is capable of breaking polypeptides into their component amino acids is hydrolysis. This simply means a chemical process whereby a water molecule is being added to a particular substance.