Answer:
The presence of a cell wall prevents the membrane from bursting,so cytolysis only occurs in animal and protozoa cells which do not have cell walls.
Explanation:
For the balanced equation shown below, how many moles of H2O will react with 9 moles of N2?
N2 + 4H2O --> 2H2O2 + N2H4
Answer:
36 mole of H20
Explanation:
N2 + 4H2O --> 2H2O2 + N2H4
H20 : N2
4 : 1
x : 9
cross multiplication
so,
= 9x4/1 = 36 mole of H20
I hope this helps a little bit.
Please help will mark brainiest as well.!!
tell uses of nitrogen
Answer:
Hello
Preservation of Food. Nitrogen gas is used to help with food preservation by preventing oxidative damage leading to food spoiling.Pharmaceuticals Industry.Electronics Manufacturing.Stainless Steel Manufacturing.Explanation:
thanks
A gray whale can travelan average of 120
km per day as it migrates.
Explanation:
False, gray whales average 75 miles per day at a speed of 5 mph and is the longest annual migration of any mammal.
Answer:
That would be speed.
Explanation:
which has the higher temperature? An iceberg or a steaming cup of water?
Why is the distance traveled between seconds 0 and 1 less than the distance traveled between 2 and 3 sceonds
Answer:
The ball speeds up
Explanation:
an element has atomic number of 17 state the elements group and period number
Answer:
The element is in group 7, the halogens. The element is in the third period or row of the table.
Explanation:
Chlorine is element number 17.
2. Calculate the mass of Kool-Aid needed to make 0.1 L solutions at the following concentrations: a. 0.1 M b. 0.2 M c. 0.3 M d. 0.4 M e. 0.5 M
How many grams of 5% barium hydroxide solution will be needed to react 2 moles of sulfur (IV) oxide?
Answer:
DONT PRESS THAT LINK IT IS VIRUS AND HACK
Explanation:
how many moles is 130g of cocl2
Answer:
1.3142 mol CoCl2
Explanation:
Well, to answer this we need to find out how many grams are in a single mole of CoCl2. Two find that we need to get the molar mass of CoCl2
Co = 28.0101 g Co per mole
Cl = 35.453 * g Cl per mole
28.0101 + 2 * 35.453 = 98.9161 g CoCl2 per mole
Now, we divide:
130/98.9161 = 1.3142 mol CoCl2
There are 1.31 moles in 130grams of cobalt chloride (CoCl2). Details about how to convert mass to moles can be found below.
How to calculate number of moles?The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass.
According to this question, there are 130g of CoCl2.
molar mass of CoCl2 = 28 + 35.5(2) = 99g/mol
moles = 130g ÷ 99g/mol
moles = 1.31 moles
Therefore, there are 1.31 moles in 130grams of cobalt chloride (CoCl2).
Learn more about number of moles at: https://brainly.com/question/14919968
Calculate the heat (in calories) released when 115 g of CHCl3 changes from a liquid to a solid at
its freezing point.
Answer: 8855 Joules energy is released when 115 g of [tex]CHCl_3[/tex] changes from a liquid to a solid at its freezing point.
Explanation:
Latent heat of freezing is the amount of heat released to convert 1 mole of liquid to solid at atmospheric pressure.
Amount of heat released to freeze 1 gram of [tex]CHCl_3[/tex] = 77 J/g
Mass of [tex]CHCl_3[/tex] given = 115 gram
Heat released when 1 g of [tex]CHCl_3[/tex] is freezed = 77 J
Thus Heat released when 115 g of [tex]CHCl_3[/tex] is freezed =[tex]\frac{77}{1}\times 115=8855J[/tex]
Thus 8855 Joules energy is released when 115 g of [tex]CHCl_3[/tex] changes from a liquid to a solid at its freezing point.
A conventional oven is example of which type of Energy transfer?
Answer:
convection (I am pretty sure, I am sorry if it isnt right)
Explanation:
Why do power plants emit such a high percentage of pollutants?
They burn fossil fuels, which releases huge amounts of sulfur dioxide and nitrogen oxide that pollute the air. ... Two thirds of all sulfur dioxide and more than one third of all nitrogen oxides that pollute the air.
What definition BEST describes a watershed?
Select one:
A: Consists only of rivers, lakes, and streams
B: Area that collects precipitation and drains it to the lowest point
C: All of the rain water of a specific area
D: Place where all water is stored underground
Answer:
I would say go with B not so sure but pretty sure it is
Classify the following as a chemical or physical property: Iron melts at 1535 degrees C. chemical or psychical?
Answer:
Physical property
Explanation:
Change in state is a physical property of matter.
I need help with this for an assignment
Purpose Question:
If you have a headache, which medicine is the best choice to take?
Your choices are Aspirin, Tylenol or Ecotrin (coated aspirin)
Answer:
I will take Aspirin if I had a headache
If you produce 10 g of water in the reaction from 20 g of O2 what is your percent yield? 2H2+O2>2H2O
Answer:
44.4%
Explanation:
The balanced chemical equation for the reaction is:
2 H₂(g) + O₂(g) → 2 H₂O(g)
According to the equation, 1 mol of O₂ produces 2 moles of water (H₂O). We convert the moles to grams by using the molecular weight (Mw) of each compound:
Mw(O₂) = 2 x 16 g/mol O = 32 g/mol
mass O₂ = 1 mol x 32 g/mol = 32 g O₂
Mw(H₂O) = (2 x 1 g/mol H) + 16 g/mol O = 18 g/mol
mass H₂O = 2 mol x 18 g/mol = 36 g H₂O
Thus, from 32 grams of O₂, 36 g of H₂O are produced (stoichiometric ratio= 36 g H₂O/32 g O₂). We calculate the amount of H₂O that would be produced from 20 grams of O₂ by multiplying the stoichiometric ratio by the mass of O₂, as follows:
36 g H₂O/32 g O₂ x 20 g O₂ = 22.5 g H₂O
The theoretical yield of H₂O is 22.5 g, and the actual amount produced is 10 g. So, we calculate the percent yield as follows:
Percent yield = actual yield/ theoretical yield x 100
= (10 g)/(22.5 g) x 100
= 44.4%
Dalton's contribution was different from thatof the ancient Greek who postulated the existence of atoms. Point out the differences between the two ideas
Answer: Democritus atomic theory is the ancient theory that describes the nature of matter in terms of atoms whereas Dalton atomic theory is a modern scientific theory that describes the nature of matter in terms of atoms. According to Dalton's theory, atoms are identically same, but Democritus had no idea about it. Atoms are never created nor destroyed, they just rearrange.
Explanation:
what known as a change in the number, type, or order of DNA
Answer:
DNA is a dynamic and adaptable molecule. As such, the nucleotide sequences found within it are subject to change as the result of a phenomenon called mutation. Depending on how a particular mutation modifies an organism's genetic makeup, it can prove harmless, helpful, or even hurtful.
Explanation:
What is the meaning of social group
Answer:
In the social sciences, a social group is two or more humans who interact with one another, share similar characteristics, and have a collective sense of unity. This is a very broad definition, as it includes groups of all sizes, from dyads to whole societies.
Explanation:
Answer:
The meaning of social group is two or more people who interact with one another, share similar characteristics, and collectively have a sense of unity.
Explanation:
Hope this helped
An atom is the largest unit that any given molecule can be broken down to.
True or False
Answer:
false
Explanation:
It is the opposite. Atoms are the smallest.
Answer:
False
Explanation:
Pls mark brainliest :)
How does snow sometimes appear blue?
Answer: So, why is the snow and ice blue? Similar to water, snow absorbs red and yellow light, leaving blue light behind to give it that bluish appearance. If snow is only a few inches deep, none of the light will be left behind, making the snow appear white. The deeper the snow, the more blue light is left behind.
Explanation:
What is the molarity of a solution when 2.75 g of NaCl is dissolved in 1100 mL of solution?
0.043 M
0.25 M
0.43 M
4.27 M
Answer:
Explanation:
0.25 M
The molarity of a solution will be 4.27M .
What is molarity?Molarity (M), often known as molar concentration, is the concentration of a solution expressed in moles of solute per liter of solution.
What is solution?Solution can be considered as a mixture of more than one component. It may be homogeneous solution as well as heterogeneous solution.
Gram to mole conversion:
[tex]=\;2.75\;g.\;\frac{1\;mol}{58.44g} \\=\;0.0470 \;mol[/tex]
Molarity of the solution can be calculated by using the following formula:
It is calculated that, moles of solute = 0.0470 mol, volume of the solution = 1100 mL.
Now, put the value of given data in molarity formula:
[tex]Molarity=\frac{Moles\;of\;the\;solute}{Volume \;of\; the\; solution} \\=\frac{0.0470\;mol}{1100 \;mL} \\=\;4.27\;mol/mL\\=\;4.27\; M[/tex]
Therefore, the molarity of a solution will be 4.27M.
To know more about molarity and solution click here.
https://brainly.com/question/2817451.
#SPJ2
Can i titrate a solution of unknown concentration with another solution of unknown concentration and still get a meaningful answer
Answer:
No, I don't think so at least
Explanation:
In chemistry, you do calculations to find the concentration of a solution with another solution of KNOWN concentration. Without concentrations of either solution, were would you get values from? Where would you start? :3
You can not titrate a solution of unknown concentration with another solution of unknown concentration and still get a meaningful answer.
Titration involves the standardization of unknown solution using a standard solution. By this definition, titration must involve a standard solution.
Since the two unknown solutions are not standardized, we can never get a meaningful answer because we can not be able to perform any calculation unless we have a standard solution.
Learn more: https://brainly.com/question/2728613
Which of these is a behavioral adaptation?
An anteater has a very long tongue to help it eat catch and eat ants.
An artic fox has white fur which helps it blend into the snow.
A mouse has 3–14 offspring at a time to increase the number that survive.
A brown bear hibernates and becomes inactive during winter.
Answer: Your answer would be D
Explanation: Sorry if i get it wrong ! (but good luck and make sure to rate)
Answer:
D
Explanation:
because when it is winter
a bear hibernates in a cave
and eats lots of food so it
dosent starve after sleeping
for such a while.
Hope this helps
plz mark brainliest
if you would be so kind!
bye!
Which of the following classifications describes the element with the electron configuration [Ar]4s23d104p5?
A) stable metal
B) unstable nonmetal
C) stable nonmetal
D) unstable metal
Answer: stable unmetal
Explanation: if you count electrons, you get 35 and it is element Br
According to the electronic configuration , the element with the given electronic configuration is a unstable non metal.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
Learn more about electronic configuration,here:
https://brainly.com/question/29757010
#SPJ6
How many molecules are found in 3.4 moles of carbon dioxide?
Please help me asap! :0
Thank you!
Answer:
One mole of anything has 6.023 x 10^23 molecules.
That would mean 3.4moles of CO2 have 6.023x 10^23 times 3.0.
So that would be2.04782×10^24 molecules in 3.0 moles of C02.
Mole measure the number of elementary entities of a given substance that are present in a given sample. 2.047×10²⁴ molecules are found in 3.4 moles of carbon dioxide.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
number of molecules of carbon dioxide = number of moles of carbon dioxide ×6.022×10²³ molecules
Number of moles of carbon dioxide=3.4moles
Substituting the values in the above equation we get
number of molecules of carbon dioxide =3.4moles×6.022×10²³ molecules
number of molecules of carbon dioxide =2.047×10²⁴
Therefore, 2.047×10²⁴ molecules are found in 3.4 moles of carbon dioxide.
To know more about mole, here:
https://brainly.com/question/15209553
#SPJ2
HELP PLEASE ASAP!!! ASAP!
Answer:
canals and irrigation is the answer
Use a scientific calculator to calculate [H+] for the following pH values:
7 (a neutral solution)
5.6 (unpolluted rainwater)
3.7 (first acid rain sample in North America)
How many times higher is the concentration of H+ in the Hubbard Brook sample than in unpolluted rainwater?
Answer:
pH = 7 ⇒ [H⁺] = 1.0x10⁻⁷ M
pH = 5.6 ⇒ [H⁺] = 2.5x10⁻⁶ M
pH = 3.7 ⇒ [H⁺] = 2.0x10⁻⁴ M
H⁺ concentration in the Hubbard Brook sample is 80 times higher than in unpolluted rainwater.
Explanation:
To answer this problem we need to keep in mind the definition of pH:
pH = -log[H⁺]Meaning that after isolating [H⁺] we're left with:
[H⁺] = [tex]10^{-pH}[/tex]Now we proceed to calculate [H⁺] for the given pHs:
pH = 7 ⇒ [H⁺] = [tex]10^{-7}[/tex] = 1.0x10⁻⁷ MpH = 5.6 ⇒ [H⁺] = [tex]10^{-5.6}[/tex] = 2.5x10⁻⁶ MpH = 3.7 ⇒ [H⁺] = [tex]10^{-3.7}[/tex] = 2.0x10⁻⁴ MFinally we calculate how many times higher is [H⁺] when pH = 3.7 than when pH = 5.6.
2.0x10⁻⁴ / 2.5x10⁻⁶ = 80Answer:
1. 7 (a neutral solution)
Answer: 10-7= 0.0000001 moles per liter
2. 5.6 (unpolluted rainwater)
Answer: 10-5.6 = 0.0000025 moles per liter
3. 3.7 (first acid rain sample in North America)
Answer: 10-3.7 = 0.00020 moles per liter
The concentration of H+ in the Hubbard Brook sample is 0.00020/0.0000025, which is 80 times higher than the H+ concentration in unpolluted rainwater.
Explanation: -