Answer:
If you have genetic variation then a community is more likely to survive because the population is more likely to have individuals who are fine if there are environmental changes. Then natural selection will happen and the species will evolve to he adapted to the new environment. If everyone in a population has the same genetics, than one thing could take them all out.
Why is energy released when intermolecular bonds form?
Answer:
Forming bonds requires energy
Explanation:
Creating a bond is bringing 2+ atoms into a more stable position.
Por qué los alimentos se dañan con mayor facilidad a temperatura ambiente que cuando están en la nevera?
Answer:
Esto se debe a que la heladera tiene mucha menor temperatura que la temperatura ambiente.
Esta menor temperatura ayuda a luchar contra los microorganismos que están en los alimentos (bacterias, hongos, etc) pues detiene en gran medida su repreduccion, la cual se ve maximizada en los rangos entre 5°C y 60°C, tal que la temperatura ambiente suele estar en el rango donde los microorganismos prosperan y se reproducen, es por ello que los alimentos se conservan mucho mejor en ambientes fríos (como la nevera) que en temperatura ambiente.
How many moles in 18g of H3PO4?
Answer:
0.184 mol
Explanation:
Look up molar masses for the elements that comprise H₃PO₄:
H = 1.008 g/mol
P = 30.97 g/mol
O = 15.99 g/mol
The molar mass of H₃PO₄ is a weighted sum of these (3 hydrogen + 1 phosphorus + 4 oxygen) that comes out to about 97.99 g/mol.
Then
(18 g H₃PO₄) × (1/97.99 mol/g) ≈ 0.1837 mol
10. What is the mass number, symbol, and
charge of an ion that contains 87 protons,
136 neutrons and 86 electrons?
Explanation:
mass number = sum of protons and neutrons
= 87 + 136
= 223
chemical symbol = Fr
ion charge = +1 (because it has one more proton than electron)
atomic mass number = sum of protons and neutrons
= 87 + 136
= 223
chemical symbol = Fr, ion charge = +1 (because it has one more proton than electron)
What is atomic mass ?Atoms are the basic and smaller units of elements which cannot be broken down further chemically, atoms and elements are organized and represented onto a display called the periodic table.
Atoms are composed of protons, neutrons, and electrons, where protons and neutrons present at the nucleus center of the atom where as electron surrounds the nucleus.
The center of the atom makes up most of the mass of the atom as this is made up of protons and neutrons. Protons are positively charged particle and neutrons have neutral charge, respectively, and each are have a mass of 1 atomic mass unit (amu).
Electrons are negatively charged particle and Amu's are units of measurement for atomic mass, proton and neutron are both equal to 1 amu.
Atomic mass units are based on the masses of protons and neutrons band one carbon atom has only six protons and usually six neutrons in the nucleus.
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HELPPPPPP!!!! SHOW WORK
Calculate the pressure exerted by heels of a 100 lb woman in high heels, if the area beneath the heel of each shoe is 0.25 square inch
Answer:
P = 400 Lb/in²
Explanation:
We are given;
Weight of woman; W = 100 lb
Area beneath heel of shoe; 0.25 in²
Now, we want to find pressure.
Formula is;
P = F/A
Where;
F is force exerted by the object which is equal to weight of the object
A is area covered by object
Thus;
P = 100/0.25
P = 400 Lb/in²
pls can someone mention 5 example of fine chemicals
Which of these statements is true about the two graphed parallelograms?
Answer:
They are similar, because one can be obtained by dilating the other about the origin with a scale factor of 1/2.
Explanation:
The dilation of a shape is similar to the original shape; this is because the corresponding side lengths are proportional.A scale factor is how many times larger or smaller the image will be relative to the preimage. In other words, multiply the x and y-coordinates by the scale factor to get the coordinate points of the image.The image is dilated by 1/2.
Take a look.
The coordinate labels of the preimage include: A, B, C, and D.
The coordinate labels of the image include: A', B', C', and D'.
Coordinates of point A: (2, 8)
Coordinates of point A': (1, 4)
**The preimage's x and y-coordinates multiplied by 1/2 will give you the x and y-coordinates of the image.**
Complete the following chemical formula and determine the final molarity of NaCl:
__ BaCl2(aq) + __ Na2SO4(aq) --> ____ + _____
You react 45g BaCl2 with an excess of Na2SO4 in 250mL of water. Find the molarity of NaCl produced.
A. 0.25
B. 0.58
C. 1.72
D. 3.82
Answer:
[NaCl] = 1.72 M
Explanation:
First of all, we balance the equation:
BaCl₂ + Na₂SO₄ → 2NaCl + BaSO₄
We convert mass of barium chloride to moles
45 g . 1mol / 208.23g = 0.216 moles
Ratio is 1:2. This means, that our moles of reactant may produce the double of moles, of product.
0.216 . 2 = 0.432 moles of NaCl are been produced.
Molarity is mol/L. We convert volume of water from mL to L
250 mL . 1L /1000 mL = 0.250 L
[NaCl] = 0.432 mol/0.250L = 1.72 M
which element is extracted from bauxide ore
How many milliliters of 0.25 M solution of silver nitrate is needed to react with
sodium chloride to produce 7.6 g of silver chloride?
Answer:
To find molarity we must convert grams KCl to moles KCl and mL solution to L: ... EXAMPLE: What mass of potassium chloride would be needed to prepare 250.0 mL of a 0.500 ... EXAMPLE: Silver nitrate solution is added to 25.00 mL of a 0.500 M potassium chloride ... g) 0.655 g of sodium carbonate in 100.0 mL of solution.
Explanation:
6. Animals have many adaptations for survival. Describe each adaptation below, and explain how it could help an organism better survive in its environment.
a) camouflage
b) mimicry
c) venom
the lower the kinetic energy of the solute particles:
Answer:
the higher the kinetic energy
Explanation:
because their will be easy movement of particles.
6.6 moles of ZnO to molecules
Answer:
3.97e24
Explanation:
For every mol of any substance there are 6.02x10^23 molecules
so
6.6(6.02x10^23)= 3.97x10^24 Molecules of ZnO
Jaiden Drives for 800 km at an average speed of 120 km/h. How long was her journey?
Answer:
i think her journey was 680 km/h long
Answer:
6.67 hours
Explanation:
(800 km) / (120 km/hr) = 6.67 hours
Which of the following is a characteristic of a strong acid?
O A. It does not conduct electricity in water.
B. It completely dissociates in water.
C. It reacts with water to form H2 gas.
O D. It increases the OH concentration.
The statement, that describes the characteristic of a strong acid is "it completely dissociates in water."
What is a strong acid?
In aqueous solution, strong acids and bases are completely ionised.
A strong acid is one that entirely ionises in solution. When dissolved in water, it emits the maximum number of hydrogen ions or protons, implying that it always loses a proton (H+).
As a result, it is possible to deduce that a strong acid (HA) entirely dissociates in solution.
Hence the correct option is B.
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(1-6) Which of the electron movements shown below (A, B, C, or D) will emit the highest energy light?
A
B
с
D
na3
ng
n=5
n=6
ОА
OB
Ос
OD
Answer:
I would say D (not sure tho)
Explanation:
i am boréd wanna chàt
yeah same I'm bóred too -,-
Answer:
sure hi ...............................
You travel 35 meters in 26 seconds, what is your average speed?
Answer:
1.346 meters per second
Explanation:
You traveled 35 meters in 26 seconds
35 / 26 = avg speed.
35 / 26 = 1.346...
PLEASE HELP!!
Consider the following intermediate chemical equations.
C(s) + O2(g) → CO2(g) AH, --393.5kJ
2CO(g) + O2(g) → 2CO2(g) AH, --566.0kJ
2H2O(g) → 2H2(g)+O2(g) AH2 - 483.6 kJ
The overall chemical equation is C(s) + H2O(g) → CO(g) +H2(g). To calculate the final enthalpy of the overall chemica
equation, which step must occur?
Reverse the first equation, and change the sign of the enthalpy. Then, add.
O Reverse the second equation, and change the sign of the enthalpy. Then, add.
O Multiply the first equation by three, and triple the enthalpy. Then, add.
O Divide the third equation by two, and double the enthalpy. Then, add.
Answer:
answer is option 2 hope it helps
The step that must be occurred in the calculation of the enthalpy of the given reaction is option B, reverse the second equation, and change the sign of the enthalpy, then add.
What is enthalpy of a reaction ?The enthalpy of a reaction is the heat energy absorbed or released by the reaction system. For a reaction, the reaction enthalpy can be calculated using the enthalpies of the component reactions.
Here the overall reaction is the formation of CO and H₂ from C and water. The first step is to reverse the second equation and change sign of enthalpy and double the first equation. Then add them, so that the CO₂ get eliminated.
Then, the resultant equation is halved again. Then divide the third equation by two and its enthalpy value also divided by 2. Then add it to the previous one and we get the net equation and corresponding reaction enthalpy.
Therefore, the step that must occur here is option B.
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What is the percent composition of YAG (Yttrium Aluminum Garnet). The formula for
YAG is (Y3A15012).
Answer: Y 21.38 % , Al 32.44 % and O 46.16 %
Explanation: Molar mass of YAl5O12 is 88.91 + 5·26.98+12·16
= 415.81 g/mol
m-% ( Y) = 88.91 / 415.81 = 21.38 % , m-% (Al) = 5·26.98 / 415.81 =
32.44 % , rest is Oxygen
A large dam was constructed across a river to create a reservoir on one side. This led to the sinking of nearby forests, which
impacted plants and animals and caused a decrease in biodiversity, Trees were also cut down to construct the dam, which led to
increased soil erosion and reduced soil fertility.
A scientist wants to reduce the impact of the dam's construction and improve the biodiversity of the ecosystem. Which solution
should the scientist choose?
A. relocating people to live in the area around the dam
B. planting trees around the reservoir to decrease soil erosion
c. using synthetic fertilizers to improve soil fertility
OD. building a small series of dams on nearby streams
Answer:
B
Explanation:
One of the main problems is the soil erosion reducing the fertitlity of the soil, thus reducing it's chances of the soil helping plant growth, thus reducing biodiversity. The other selections worsen the problem.
What is the “advantage” and “disadvantage” when there is a mechanical advantage less than 1?
SELECT ALL THAT APPLY
A. Force Advantage
B. No Advantage
C. Distance Advantage
D. Force Disadvantage
E. Distance Disadvantage
Answer: Force disadvantage and distance advantage
Explanation: When mechanical advantage is less than one the force of the strength decreases because input force is greater than output force.
The distance increases ie the object is moving over a long distance.
Example when fishing with a long fishing rod the force applied to move the fish from the water is greater than the weight of the fish itself. The advantage of using the long fishing pole is that the distance over which the fish travels is greatly increased.
Hope this helps. It took me about half an hour before I could get this answer from my various searches. The idea might not be clear but this was what I was able to understand.
Jerry designed a coat that he thinks could keep people dry during a thunderstorm. He created a prototype that looks just like his drawing. What should Jerry do next?
Answer:
The next step is prototype testing
Explanation:
The stages of the design process are;
1) Situation analysis
Paper based research is conducted on the situation to obtain the situation parameters
2) Brief writing
With the situation analysis developed above, the brief of the current situation is put down on paper
3) Problem research
The problem is researched and experimented on with the development of a paper based proof of the possible concept
4) Specification writing
The specifications of the problem are outlined
5) List the possible solutions
The possible solutions are brainstormed and listed
6) Preferred solution selection
The preferred solution is selected based on the constraints in the situation
7) Create working drawing/plan
The working design drawing of the selected solution or concept is completed and evaluated for applicability
8) Building of a prototype
The design is converted into a prototype which is a model of the actual solution
9) Testing of the prototype
The prototype is tested for functionality, for ability to work in the intended situation and/or in the intended system
10) Report writing
A report is made on the outcome of the tests for review before production
Therefore, after the prototype is created, stage 8, the next step is the testing of the prototype stage 9.
About what fraction of Earth’s surface is covered by water?
A:1/4
B:1/2
C:3/4
D:9/10
The addition of electron shells results in _______ shielding of electrons from the nucleus.
Answer:
I believe the answer is "increasing"
Answer:
the shielding of electrons.
Explanation:
The nucleus pulls electrons to itself due to the net positive charge on it.As more electronic shell is added, the effect of the pull weakens outward.The inner shell experiences the nuclear pull more than the outer shell electrons.The bathroom mirror has water droplets on it after a hot shower. choose the correct phase change. HELPP
Answer:
what?
Explanation:
what the hell?
7
What might cause a theory to change over time?
A
New laws passed by the government
B
New but untestable Ideas
C Changes in public opinion
D
The discovery of new evidence
Answer:
D. The discovery of new evidence.
D is correct because it's the only one that would give proof and science relies on proof.
Suggest a procedure for separating iron shavings from sawdust. Explain why this procedure would work.
Dont send a file i will report you if you do
Answer:
Magnetic separation
Sawdust is a non-magnetic material whereas iron shavings are magnetic. When a magnet is brought near a mixture of iron shavings and sawdust, the iron shavings will be attracted to the magnet while the sawdust will not. Thus, the iron shavings will be separated from the sawdust.
Explanation:
Separation techniques makes use of the differences in the properties of components of mixtures to separate theses components, one from another.
In a moxturemof iron shavings and sawdust, a suitable separation technique would be the use of magnetic separation.
The use of this separation technique is abasednonnthe principle that when a magnetnis brought near to a mixture containing magnetic and non-magnetic materials, the magnetic materials will be separated from the non-magnetic materials due to their attraction to the magnet. Sawdust is a non-magnetic material whereas iron shavings are magnetic. When a magnet is brought near a mixture of iron shavings and sawdust, the iron shavings will be attracted to the magnet while the sawdust will not. Thus, the iron shavings will be separated from the sawdust.
Which statement most accurately describes a chemical equation?
a. in a chemical reaction, the mass of the energy change must be equal to the energy used
b. in a chemical reaction, the mass of the products must equal the mass of the reactants
c. in a chemical reaction, the mass of each product must be the same
d. in a chemical reaction, the combined mass of the container the substances is always equal
Answer: C
Explanation:
How many grams of iron (III) oxide are needed?
Answer:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Iron(III) Oxide, or 159.6882 grams.