Answer:
In natural selection, organisms adapt to the environment to best suit nature's needs to survive. In selective breeding, it's as if nature were humans and the humans can choose which organisms can survive and die. They do it so they can develop organisms with desirable characteristics.
How do river systems, watersheds, and divides interact?
Answer:
They all end up in the oceon
Explanation:
Answer:
ok
Explanation:
i think they will all end up in ocean
2. The reaction of zinc with nitric acid was carried out in a calorimeter. This reaction caused the temperature
of 72.0 grams of liquid water, within the calorimeter, to raise from 25.0°C to 100.°С. Calculate the energy
associated with this reaction.
We want to solve Q = mcΔT for the liquid water; its change in temperature will tell us the amount of thermal energy that flowed out of the reaction. The specific heat, c, of water is 4.184 J/g °C.
Q = (72.0 g)(4.184 J/g °C)(100 °C - 25 °C) = 22593.6 J
Q ≈ 2.26 × 10⁴ J or 22.6 kJ (three significant figures).
Choose the larger atom from each pair, if possible.
a. Sn or Si,
b. Br or Ga,
c. Sn or Bi,
d. Se or Sn
Answer:
a. Sn or Si ⇒ Sn
b. Br or Ga ⇒ Ga
c. Sn or Bi ⇒ similar in size
d. Se or Sn ⇒ Sn
Explanation:
The larger atom has a larger atomic radius. We have to consider how varies the atomic radius for chemical elements in the Periodic Table. In a group (column), the atomic radius increases from top to bottom while in a period (file), it increases from right to left.
a. Sn or Si ⇒ Sn
They are in the same group. Sn is on the top, so it has a larger atomic radius.
b. Br or Ga ⇒ Ga
They are in the same period. Ga is located at the left so it has a larger atomic radius.
c. Sn or Bi ⇒ similar
They are not in the same group neither the same period. Bi is located more at the bottom, so it would be larger than Sn, but Bi is also at the right side, so it would be smaller than Bi. Thus, they have comparable sizes.
d. Se or Sn⇒ Sn
They are not in the same group neither the same period. Se is located at the top and right side compared to Sn, so Sn is the larger atom.
Describe the energy in nuclear fuel and the way in which it’s converted to electrical energy. Write 50 to 100 words.
Explanation:
You will have to rewrite this in your own words please. Download the app Paraphrase and also download Plagiarism Checker. Go on Paraphrase first and write it out then go to Plagiarism second and it'll tell you if you still need to reword it.
Answer:
A nuclear reactor produces electricity in much the same way other power plants do. The chain reaction produces the energy, which turns water into steam. The pressure of the steam turns a generator, which produces electricity.
Explanation:
Nuclear energy originates from the splitting of uranium atoms a process called fission. In nuclear fission, atoms are split apart to form smaller atoms, releasing energy. Fission takes place inside the reactor of a nuclear power plant. At the center of the reactor is the core, which contains uranium fuel. The uranium fuel is formed into ceramic pellets. Inside each uranium fuel pellet, there are millions of uranium nuclei. When these nuclei are split, a huge amount of energy is released. Some of this energy is from radiation, but the biggest source is kinetic energy. This is the energy that produces heat inside a reactor. The heat produced during nuclear fission in the reactor core is used to boil water into steam, which turns the blades of a steam turbine. As the turbine blades turn, they drive generators that make electricity. Nuclear plants cool the steam back into water in a separate structure at the power plant called a cooling tower, or they use water from ponds, rivers, or the ocean. The cooled water is then reused to produce steam.
22.4 L of hydrogen is taken in a cylinder at zero degree Celsius and at one atm. This gas is transferred to a cylinder of 11.2 L capacity without change in temperature. The present pressure and mass of the gas is ....... & ......
Answer:
2 Atm; 2.016 g
Explanation:
Changing the volume without changing the temperature or mass only changes the pressure. Volume and pressure are inversely proportional so halving the volume will double the pressure.
P = 1 Atm, T = 0 °C are "standard" temperature and pressure (STP). The volume of 1 mole of gas is 22.4 L under these conditions. That means the amount of hydrogen gas in the cylinder is 1 mole, so has a mass of 2.016 g.
After the volume reduction, the pressure is 2 Atm, and the mass remains 2.016 g.
Answer:
2 ATM ; 2.016 gAfter the volume of reductionExplanation:
hope it helps
What is the concentration expressed in parts per million of a solution containing 15.0 grams of KNO3 in 65.0 grams of H2O?
Answer:
The concentration will be "[tex]1.88\times 10^5 \ ppm[/tex]".
Explanation:
The given values are:
Mass of solute (KNO₃),
= 15.0 grams
Mass of solvent (H₂O),
= 65.0 grams
The concentration will be:
= [tex]\frac{Mass \ of \ solute}{Mass \ of \ solution}\times 10^6[/tex]
On substituting the values, we get
= [tex]\frac{15.0}{65.0+15.0}\times 10^6[/tex]
= [tex]\frac{15.0}{80}\times 10^6[/tex]
= [tex]0.1875\times 10^6[/tex]
= [tex]187500 \ ppm[/tex]
or,
= [tex]1.88\times 10^5 \ ppm[/tex]
What is the name for a star that has too low of a mass to start hydrogen fusion?
А.white dwarf
B.black dwarf
C.red dwarf
D. brown dwarf
Answer:
red dwarf
Explanation:
Answer:
D
Explanation:
Approximately how many formula units of NaCl are in 116.88g of table salt (NaCl), knowing that the molar mass of NaCl is 58.44g/mol?
Answer:
116.88g of table salt (NaCl) contains two formula units
Explanation:
Now,
We know that 1 formula unit of sodium chloride has a molar mass of 58.44g/mol
Hence;
Mass of 1 formula unit = 58.44g
Mass of x formula units = 116.88g
x = 116.88g * 1 formula unit/58.44g
x = 2 formula units
Therefore;
116.88g of table salt (NaCl) contains two formula units
Answer:
There are 1.2044 × 10²⁴ formula units of NaCl in 116.88 g of table salt (NaCl)
Explanation:
A formula unit is an empirical formula of the smallest collection or number of atoms in an ionic or covalent combination from which a compounds formula can be established and which are used to represent the compound stoichiometrically
Sodium chloride is an ionic compound and is represented by the formula unit NaCl as it composed of ions and is not therefoe represented by a molecular formula
The given mass of the table salt, NaCl = 116.88 g
The molar mass of NaCl = 58.44 g/mol = The mass of 1 mole of NaCl
1 mole of NaCl contains one Avogadro's number or 6.022 × 10²³ formula units of NaCl,
∴ 58.44 g of NaCl contains 6.022 × 10²³ formula units of NaCl
116.88 g of NaCl will have (116.88/58.44) × 6.022 × 10²³ = 1.2044 × 10²⁴ formula units of NaCl
The number of formula units of NaCl in 116.88 g of table salt (NaCl) = 1.2044 × 10²⁴ formula units of NaCl.
Can you help me out with gravity study!?
Awnser 4 questions only please!
Answer:
F
T
F
T
Explanation:
i hope these are right
please help! What is the empirical formula for a compound that has 1 mole of nitrogen and 2.5 moles of oxygen?
Answer:
[tex]N_{2}O_{5}[/tex]
Explanation:
usually, the first step is to calculate the moles but since that is already given in the question we can move onto the next step
least molar ratio:
N = [tex]\frac{1}{1}[/tex] = 1
O = [tex]\frac{2.5}{1}[/tex] = 2.5
when the answer is in decimals we will multiply it by an integer in order to make it a whole number (in this case 2)
O = 2.5(2) = 5
in order to balance, we will also multiply the atoms of N by the same integer
N = 1(2) = 2
thus, the empirical formula is [tex]N_{2}O_{5}[/tex]
Complete each nuclear reaction equation.
Superscript 14 subscript 7 upper N plus superscript 4 subscript 2 upper H e right arrow superscript question mark subscript 8 upper O plus superscript 1 subscript question upper H.
Nitrogen transmutes to form an isotope of oxygen. The superscript for oxygen is?
The subscript for hydrogen is?
Superscript 59 subscript question mark upper C o plus superscript 1 subscript 0 n right arrow superscript 60 subscript 27 upper C o.
Cobalt-59 accepts a neutron to form a new isotope. The subscript for cobalt is?
Nitrogen transmutes to form an isotope of oxygen. The superscript for oxygen is 17
The subscript for hydrogen is 1
Cobalt-59 accepts a neutron to form a new isotope. The subscript for cobalt is 27
Answer:
Oxygen = 17
Hydrogen = 1
Cobalt = 27
Explanation:
give the equation
CO2(g) <- -> CO2(aq) if we add more CO2(g), carbon dioxide to the air what way would the reaction shift?
Answer:
The equilibrium position shifts to the right.
This is due to excess carbon dioxide which supresses the reaction.
Calculate the frequency in hertz of electromagnetic radiation that has a wavelength of 645.0 nm. (c = 3.00 X 10⁸ m/s)
Answer:
1/wavelength
c=1/alpha
How many atoms would be contained in 454 grams of iron?
Answer:
4.90 x 10 24 atoms
Explanation:
the 24 is the exponent for the 10
I'll give 50 pts and brainliest
Briefly explain the different types of mining and the processes!!
Answer:
Response is below
Explanation:
The different types of mining are underground, surface, placer, and in-situ. Underground mining uses various materials to excavate resources from beneath the surface of the Earth. Surface mining is a category of mining that in which soil and rock overlying the mineral deposit are removed. Placer mining is the mining of stream bed deposits for minerals. In-situ mining is a mining process used to recover minerals such as copper and uranium through boreholes drilled into a deposit.
what do elements and atoms have in common
Answer:
what they have in common is consist of electrons, protons, and neutrons.
Explanation:
describe the process of testing the pH of an unknown solution
A pH meter will make short work of identifying the pH of your solution. These meters have a glass probe that measures a solution's ion concentration. To use a pH meter, place a small portion of your solution in a beaker or test tube, rinse the probe of the pH meter, and then place the probe into your solution.
Source:
https://sciencing.com/identify-solution-neutral-base-acidic-8346.html
pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7. pH meter is the only instrument to measure the pH of an unknown solution.
What is pH?pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.
On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution.
pH meter is used to measure the pH of an unknown solution. A glass probe is attached to pH meters, that measure the concentration of hydrogen ion in unknown solution. Take the unknown solution in the beaker and then put the washed, clean glass probe in the solution. Now wait for a second to take the reading.
Therefore, pH meter is the only instrument to measure the pH of the solution.
To learn more about pH, here:
https://brainly.com/question/27945512
#SPJ2
MRI machines use extremely strong magnetic fields. These fields must be adjustable to produce high-quality images. What might these
machines use to generate such a field?
A
electromagnets
B
permanent magnets
C
induced current
Sarah is running a race and is almost to the finish line. In the last 5 seconds, her velocity changes from 2m/s to 4m/s. What is her average acceleration during the last 5 seconds of the race?
Answer:
[tex]\boxed {\boxed {\sf a= \frac {2}{5} \ or \ 0.4 \ m/s^2}}[/tex]
Explanation:
Acceleration is found by dividing the change in velocity by the time. The formula is:
[tex]a= \frac {v_f-v_i}{t}[/tex]
where [tex]v_f[/tex] is the final velocity, [tex]v_i[/tex] is the initial or starting velocity, and [tex]t[/tex] is the time.
Her velocity changes from 2 meters per second to 4 meters per second in the 5 seconds. Therefore:
[tex]v_f= 4 \ m/s \\v_i= 2 \ m/s \\t=5 \ s[/tex]
Substitute the values into the formula.
[tex]a= \frac { 4 \ m/s- 2 \ m/s}{5 \ s}[/tex]
Solve the numerator and subtract.
[tex]a= \frac { 2 \ m/s}{5 \ s}[/tex]
Divide.
[tex]a= \frac{2}{5} \ m/s/s= \frac{2}{5} \ m/s^2[/tex]
This can also be written as a decimal.
[tex]a=0.4 \ m/s^2[/tex]
Her average acceleration during the last 5 seconds of the race is 2/5 or 0.4 meters per square second.
Answer:
Solution :-Here
Initial velocity = 2 m/s
Final velocity = 4 m/s
Time = 5 sec
v = u + at
4 = 2 + a(5)
4 - 2 = a(5)
2 = 5a
2/5 = a
Hence, acceleration is 2/5 m/s²
As the temperature of a gas is increased, the
average kinetic energy of its molecules
A decreases
B. increases
Cremains the name
Answer:
B- Increase
Explanation:
In the event that the temperature is increased, the normal speed and dynamic energy of the gas atoms increment. In the event that the volume is held steady, the sped up the gas particles brings about more incessant and more powerful crashes with the dividers of the compartment, hence expanding the pressing factor
Why or how, do electrons receive a positive charge during beta decay?
Answer: Beta decay occurs when a nucleus is unstable because it has too many or too few neutrons relative to protons. The nucleus emits a beta particle and energy. In beta-minus decay, a neutron breaks down to a proton and an electron, and the electron is emitted from the nucleus.
Explanation:
For the night yet balanced equation, No + CuCl2 —> Cu + NiCl3, if you started with 12.00 g of nickel and 42.00 g of CuCl2, how much Copper would you expect to produce Perdue
Answer:
19.45g of Cu are expect to be produced
Explanation:
Based on the reaction:
2Ni + 3CuCl2 → 3Cu + 2NiCl3
2 moles of Ni react with 3 moles of CuCl2 to produce 3 moles of Cu
To solve this question we must find the moles of each reactant in order to find the limiting reactant. With the limiting reactant we can find the moles of Cu produced and the mass as follows:
Moles Ni -Molar mass: 58.6934g/mol-
12.00g * (1mol / 58.6934g) = 0.204 moles Ni
Moles CuCl2 -Molar mass: 134.45g/mol-
42.00g * (1mol / 134.45g) = 0.312 moles CuCl2
For a complete reaction of 0.204 moles of Ni are required:
0.204 moles Ni * (3 moles CuCl2 / 2 moles Ni) = 0.306 moles of CuCl2
As there are 0.312 moles, CuCl2 is the excess reactant and Ni is limiting reactant.
Moles Cu:
0.204 moles Ni * (3moles Cu / 2 moles Ni) = 0.306 moles of Cu are produced
Mass Cu:
0.306 moles of Cu * (63.546g / mol) =
19.45g of Cu are expect to be produced If 1.00L of water is added to 3.00 L
of a 6.00M solution of HCl, what is the
new molarity of the acid solution?
Answer:
4.5M
Explanation:
Here is why:
Can someone please help me. Like right now please
Answer:
3rd law
Explanation:
when two objects interact, they apply forces to each other of equal magnitude and opposite direction.
What is the pH of a 0.0001 M aqueous solution of HCI?
What is the total volume of solution that was dispensed from this burette?
A. 32.3 ml
B. 32.9 ml
C. 0.6 ml
D. 32.6 ml
E. 65.2 ml
Answer:
it will a i did the quiz got it all right
Explanation:
The topic of stoichiometry includes all of these except
Answer:
B
Explanation:
What is the same for all of the drilling sites we examined?
Answer:
the same is what is this question like what did u exame
Which best describes what forms in nuclear fission?
two smaller, more stable nuclei
two larger, less stable nuclei
one smaller, less stable nucleus
one larger, more stable nucleus
Answer:
two smaller, more stable nuclei
Explanation:
A. two smaller, more stable nuclei
Explanation:Nuclear fission is the process in which a heavy nucleus is split into two large fragments of comparable mass to form more stable and smaller nuclei. This results in the release of great amounts of energy. Large nuclei are usually less stable, since it takes more energy to hold its structure together, the larger they are.
Here's a photo of Edge just incase.
an equation thats shows how an objects acceleration relates to its mass
Answer:
Newton's second law of motion
F = ma