Explanation:
Selective breeding involves choosing parents with particular characteristics to breed together and produce offspring with more desirable characteristics.
What is and ionic bond and how it forms and why it forms
Question 14 (4 points)
(04.04 MC)
Which of the following describes the interrelated nature between photosynthesis and cellular respiration? (4 points)
A)They together help to lower the percentage of carbon dioxide in nature.
B)They both help increase the fossil fuel availability for humans.
C)They together help recycle important elements in nature.
D)They both help lower our carbon footprint.
C They together help recycle important elements in nature.
This is because photosynthesis removes carbon dioxide and creates oxygen while cellular respiration does the opposite. This results in no increase or decrease in any of the elements, and therefore means there needs to be a cycle.
True or False.There is a chemical difference between the gaseous and liquid state of the same substance.
A balloon containing 0.0400 mol of a gas with a volume of 500 mL was expanded to 1.00 L.
Answer the questions and round answers to nearest hundredth place.
Which equation should you use to find the amount of gas added?
V subscript 2 equals StartFraction V subscript 1 n subscript 2 over n subscript 1 EndFraction.
n subscript 2 equals StartFraction V subscript 2 n subscript 1 over V subscript 1 EndFraction.
n subscript 2 equals StartFraction V subscript 1 n subscript 1 over V subscript 2 EndFraction.
Answer:
b
Explanation:
answered it correctly
Answer:
B and .08 Moles
Explanation:
What criteria does this mixture have to satisfy to be separated by simple or fractional distillation
Hi, the given question is incomplete, the complete question is:
You carry out a reaction that yields a major product Q (boiling point: 120°C) and side product R (boiling point: 150°C). The ratio of Q to R is 70:30. Both Q and Rare liquids.
After the ethyl acetate is evaporated, Q and R (a mixture of liquids) remain. What criteria does this mixture have to satisfy to be separated by simple or fractional distillation (besides bp difference and composition)?
Answer:
The basic criteria are that the two liquids should be miscible. A mixture of two miscible liquids is further separated by the process of simple distillation and fractional distillation. For the liquids that exhibit varied boiling points, with a difference of +30 degrees C, the process of simple distillation is used. On the other hand, for the liquids whose boiling points come between the range of o to 30 degrees C, the process of fractional distillation is used.
I NEED THIS ANSWER A.S.A.P
Obsidian is (a)n ____________ rock because it forms above the ground
(a) non-foliated
(b) foliated
(c) intrusive
(d) extrusive
please answer it I really need this answer to pass thank you
Answer:B
Explanation:
what type of mixture is a sandstorm
Answer:homogeneous mixture
A sandstorm is a homogeneous mixture.
Explanation:
Answer:
homogeneous mixture
Explanation:
What best defines a population
Answer:
A number of organisms in a specific area/place
Explanation:
What will happen to the volume of a gas if the Kelvin temperature of the gas is reduced to 1/4 of the original temperature and the pressure of the gas is halved?
The volume of the gas will be 1/8 of the original volume.
The volume of the gas will remain the same.
The volume of the gas will be 1/6 of the original volume.
The volume of the gas will be half of the original volume.
Answer:
the volume of the gas will be 1/8 of the original value
Explanation:
To measure the amount of calcium carbonate in a seashell, an analytical chemist crushes a sample of the shell to a fine powder and titrates it to the endpoint with of hydrogen chloride solution. The balanced chemical equation for the reaction is:
The given question is complete, the complete question is:
To measure the amount of calcium carbonate (CaCO) in a seashell, an analytical chemist crushes a 4.80 g sample of the shell to a fine powder and titrates it to the endpoint with 515. mL of 0.140 M hydrogen chloride (HCl) solution. The balanced chemical equation for the reaction is: 2HCI(a)Co (a) H2Co,(aq) + 2Cl (aq)
What kind of reaction is this?
If you said this was a precipitation reaction, enter the chemical formula of the precipitate.
If you said this was an acid-base reaction, enter the chemical formula of the reactant that is acting as the base.
If you said this was a redox reaction, enter the chemical symbol of the element that is oxidized
Calculate the mass percent of CaCO in the sample. Be sure your answer has the correct number of significant digits.
Answer:
It is an acid-base reaction and the mass percent of CaCo3 is 75.2%.
Explanation:
A chemical reaction in which an insoluble salt produces from two soluble salts is termed as precipitation reaction.
A reaction in which atleast exchange of one proton takes place between the two species is termed as an acid-base reaction.
A reaction in which any of the element has a change in oxidation state is termed as redox reaction.
In the mentioned reaction, there is a transfer of H⁺, no precipitation is forming, and no change in oxidation state taking place, thus, it is an acid-base reaction.
In the acid-base reaction, the base refers to the species that accepts hydrogen ion or proton. In the given case, CO₃²⁻ is accepting H+ ion to become H₂CO₃. Hence, CO₃²⁻ is the base.
In order to calculate mass percent of CaCO₃, first there is a need to find the moles of HCl reacted for a solution,
Moles = Molarity × Volume (L)
Moles = 0.140 mol/L × 515 × 10⁻³ L
Moles = 0.0721 mol
Now from the balanced equation, one mole of CaCO₃ needs two moles of HCl.
So, moles of CaCO₃ reacted will be,
= 1/2 × 0.0721 = 0.03605 mol
The mass of calcium carbonate taking part in reaction will be,
= Moles × Molar mass
= 0.03605 × 100 gram/mole
= 3.6086 gram
Mass% of CaCO₃ = Mass of CaCO₃/Mass of sample × 100
= 3.6086 grams/4.80 grams × 100
Mass % = 75.2%
What is the [H3O+] in pond water having a pH of 4.05?
Explanation: pH is a measure of whether water is acidic or basic. Fish have an average blood pH of 7.4, so pond water with a pH close to this is optimum. An acceptable range would be 6.5 to 9.0. Fish can become stressed in water with a pH ranging from 4.0 to 6.5 and 9.0 to 11.0.
When an atom makes a transition from a higher energy level to a lower one, a photon is released. What is the wavelength of the photon that is emitted from the atom during the transition?
Answer:
Depends on different states.
Explanation:
The wavelength of the photon that is emitted from the atom during the transition depends on the transition from different states. If the photon is emitted from n=4 state to n=3 state, the wavelength of photon is 1875 while on the other hand, if the photon is emitted from n=5 state to n=3 state, the wavelength of photon is 1282. If the photon is emitted from n=3 state to n=2 state, the wavelength of photon is 656.
A 3.74-L cylinder contains 4.17 g of methane, CH4, at a pressure of 3020 mmHg. What is the temperature of the gas
Answer:
T = 694 K
Explanation:
Given the following data:
V= 3.74 L
mass = m = 4.17 g
P = 3020 mmHg x 1 atm/760 mmHg= 3.97 atm
We use the ideal gases equation to calculate the temperature (T):
PV= nRT ⇒ T= PV/nR
We calculate n (number of moles of methane gas) by dividing the mass into the molar mass of methane (CH₄):
molar mass(CH₄) = MM = (1 x 12 g/mol)+ (4 x 1 g/mol) = 16 g/mol
n = m/MM= 4.17 g/(16 g/mol)= 0.261 mol
Finally, we calculate T:
T= PV/nR = (3.97 atm x 3.74 L)/(0.261 mol x 0.082 L.atm/K.mol) = 694 K
The solubility product for an insoluble salt with the formula M2X3 is written as ________, where s is the molar solubility
Answer:
36s^5
Explanation:
We have;
M2X3 (s)------> 2M^3+(aq) + 3X^2-(aq)
If [M^3+(aq)] = [X^2-(aq)] = s
We then have;
Ksp = (2s)^2 * (3s)^3
Ksp = 4s^2 * 9s^3
Ksp = 36s^5
Note that Ksp is known as the solubility product. It is an equilibrum equation that shows the solubility of a solute in water.
Identify the following emission.
A student wants to make HgS. They add 23 grams of Hg and 0.95 grams of S. How many moles of each element have they added?
what conclusion can we draw from solubility curve
Answer:
A solubility curve can help your draw out the graphical connection between temperature and the solubility of a substance. The X-axis denotes temperatures and the Y-axis shows the solubility of the substance.
Explanation:
What is the product of the reaction?
Answer: In a chemical reaction substances elements and compounds called reactants are changed into other substances compounds and elements called products.You can't change one element into another in a chemical reaction that happens in nuclear reactions.
Explanation:
Which of the following biogeochemical cycles uses the reaction 2N2 + 6H2O --> 4NH3 + 3O2? (3 points) The phosphorus cycle The carbon cycle The water cycle The nitrogen cycle
Answer:
The nitrogen cycle
Explanation:
The nitrogen cycle is the process in which nitrogen (N₂) is converted to a biologically useful species (ammonia, NH₃).
We can also discard the other options given by the problem:
There is no phosphorus nor carbon in the reaction.The water cycle involves water changing phases (tipically from gas to liquid to gas again), instead of reacting and producing oxygen.Which of these choices best describes a pedigree?
a diagram of family relationships that includes several generations
a hypothesis that explains why genes are recessive or dominant
a diagram that lists alleles of two parents and shows the possible allele combinations of their offspring
an illustration that shows the genetic diversity among different species
Answer:
a diagram that lists alleles of two parents and shows the possible allele combinations of their offspring
Explanation:
The Haber process which is used to produce ammonia for fertilizercombines hydrogen
and nitrogen under high pressure. The equation is shown below:
N, + 3H. = 2NH
70.2 mol
An industrial chemist mixes 105.3 mol
of H, and 56.2 mol of N. in a Haber
process reactor. How many moles of
ammonia will form?
105.3 mol
56.2 mol
35.1 mol
Answer:
Number of moles of ammonia formed = 70.2 mol
Explanation:
Given data:
Number of moles of H₂ = 105.3 mol
Number of moles of N₂ = 56.2 mol
Number of moles of ammonia formed = ?
Solution:
N₂ + 3H₂ → 2NH₃
Now we will compare the moles of ammonia with both reactant.
H₂ : NH₃
3 : 2
105.3 : 2/3×1.05.3 = 70.2 mol
N₂ : NH₃
1 : 2
56.2 : 2×56.2 = 112.4mol
As energy from the Sun hits the ocean, that energy transforms the water in
the ocean into -
F water vapor in the atmosphere
Gwater vapor under the ground
H solid ice in the atmosphere
J solid ice under the ground
Answer:
F
Explanation:
i dont know how water vapor would hit the ocean and go underground? so i think its F
how many liters of o2 do you have if you have 5.8 moles of o2
Answer:
130 Liters
Explanation:
if 1 mol is 22.4 L, then 5.8 mol is 130 L (129.92 but use sig figs)
Organs ____.
A. Perform functions that tissues cannot carry out on their own
B. are made of only one type of tissue
C. only exist in animals
D. are less complex than the tissues which make them
Answer:
B are made of only one type of tissue
Explanation:
Idon 't know if this correct I'm not sure
All circuits must have three things: energy source, wire, and a generator Lesson 5.04 Question 7 options: True False
Answer:
True
Explanation:
Sorry i'm late probably but i answered this for you :) i hope this helps though
It is true that all circuits must have three things: energy source, wire, and a generator.
What is a circuit?A circuit in electronics is a complete circular path through which electricity flows.
A basic circuit is made up of a current source, conductors, and a load. The term circuit can be used broadly to refer to any fixed path through which electricity, data, or a signal can travel.
Circuits are classified into five major types: closed circuits, open circuits, short circuits, series circuits, and parallel circuits.
An electric circuit consists of a device that provides energy to the charged particles that make up the current, such as a battery or a generator, as well as devices that use current, such as lamps, electric motors, and so on.
All circuits must include three components: an energy source, wire, and a generator.
Thus, the given statement is true.
For more details regarding a circuit, visit:
https://brainly.com/question/12608491
#SPJ6
Which of the following would be a clue that a rock is sedimentary?
Answer:
no
Explanation:
Would changing the physical property of a substance will create a new substance
true or false
Answer:
True
Explanation:
ldentify the number of moles of each element
present in one mole of NHạNO3.
# moles N:
# moles H:
#moles O:
2 moles N
2 moles H
3 moles O
Further explanationGiven
The compound is probably NH₂NO₃
Required
The number of moles
Solution
moles Nthere are 2 N in NH₂NO₃, so moles N = 2moles
moles Hthere are 2 H in NH₂NO₃, so moles H = 2moles
moles Othere are 3 O in NH₂NO₃, so moles O = 3 moles
Answer:
N=2 moles
H=4 moles
O=3 moles
Explanation: just did it on edg
Someone help me please!!!!!!
How many moles, of SiC is produced from 5.0 mol C?
SiO2 + 3C → SiC + 2CO
Answer:
1.67 moles SiC
Explanation:
Given Rxn SiO₂ + 3C => SiC + 2CO
Given mass => 5 moles C => ? moles SiC will be formed
Mass (moles) SiC yield = 1/3(5moles) = 1.67moles SiC
Solution Analysis:
Look at the balanced equation and note the coefficients of the given and unknown. In the above case, the balanced equation shows 3 moles Carbon to 1 mole Silicon Carbide. Since the coefficient for SiC is smaller than the coefficient for C then one should get a yield of SiC smaller than moles of C given. To calculate the yield based on these two compounds make a ratio of coefficients such that when multiplied by the given (5 moles in this case) one obtains a number smaller than 5. That is, 1/3(5 moles) = 1.67 moles SiC. Note that the moles of SiC (=1.67) is smaller than moles of C (=5 moles). You certainly would not get a smaller number than 5 if you used the ratio 3/1(5) moles = 15 moles. Wrong!
Here’s another example:
Given Rxn => 3H₂ + N₂ => 2NH₃
Given 7 moles H₂ calculate the moles of NH₃ produced.
Solution:
Note the known is moles H₂ and NH₃ the unknown. From the balanced equation note the coefficient of NH₃ is smaller than the coefficient for H₂. Therefore using the coefficients of H₂ (3) and NH₃ (2) form a ratio such that when multiplied by the given 7 moles one gets a smaller number (the answer needed).
Therefore, mass (moles) NH₃ produced = 2/3(7) moles NH₃ = 3.33 moles NH₃ produced from 7 moles of H₂. 3.33 < 7 as defined by balanced equation.
Rule of Thumb...
When working equation problems, first convert all given data to moles and then use the ratio of coefficients to make the given smaller or larger as defined by equation. Then, if needed, convert moles to desired dimension for problem given.
