Answer:
Some humans are randomly immune to malaria or have increased bone density due to random beneficial mutations.
Explanation:
Answer: one that changes the color of a rabbit, allowing it to hide from predators.
Explanation:Hey give me brainliest award need it
Why would Pluto be colder than all of the other planets?
Answer:
Pluto is farthest from the sun and hence it receives extremely low energy of sun. The surface temperature of Pluto is about -240 !!!
Answer for number 9 i need it asap thank you
Answer:
a) Trichloromethyl
b) Trinitrogen Pentoxide
c) Carbogen
Explanation:
What volume of product is produced when 20.0 Mg of liquid hydrogen reacts with
excess liquid oxygen in a rocket propellant reaction? The gas is formed at 101.325 kPa and 40˚ C
Answer: The volume of product formed is 0.26 L
Explanation:
[tex]\text{Moles of solute}=\frac{\text{given mass}}\times{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} H_2=\frac{0.02g}{2g/mol}=0.01moles[/tex]
[tex]2H_2(l)+O_2(l)\rightarrow 2H_2O(g)[/tex]
As [tex]O_2[/tex] is the the excess reagent, [tex]H_2[/tex] is the limiting reagent as it limits the formation of product.
According to stoichiometry :
2 moles of [tex]H_2[/tex] give = 2 moles of [tex]H_2O[/tex]
Thus 0.01 moles of [tex]H_2[/tex] will give =[tex]\frac{2}{2}\times 0.01=0.01moles[/tex] of [tex]H_2O[/tex]
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = 101.325 kPa = 1 atm
V = Volume of gas = ?
n = number of moles = 0.01
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]40^0C=(40+273)K=313K[/tex]
[tex]V=\frac{nRT}{P}[/tex]
[tex]V=\frac{0.01mol\times 0.0821L atm/K mol\times 313K}{1atm}=0.26L[/tex]
Thus the volume of product formed is 0.26 L
a b c d e f g h i j k l m n o p q r s t u v w x y z
Answer:
B
Explanation:
The answer is substitution
what do many bases have in common
Answer:
they often form hydroxide ions
Explanation:
13. Hydrogen and helium have both been used to fill balloons. Which property of helium
makes it the preferred choice to hydrogen?
Answer:
Helium is lighter than Hydrogen and Helium is a much safer gas.
Answer:
Helium gas is known to be very light which makes it a preferred choice to hydrogen. Helium has low boiling point, low density, low solubility, high thermal conductivity and inertness. Since it is less dense, it is considered suitable for filling balloons.
What can be said about 1 mole of Ag and 1 mole of Au?
Explanation:
Avogadro's number. What can be said about 1 mol Ag and 1 mol Au? ... They contain the same number of atoms.
1 mole of Ag and 1 mole of Au contain the same number of particle. Therefore, option B is correct.
What is mole ?The International System of Units uses the mole (symbol: mol) as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material. It is specified that the mole contains exactly 6.022140761023 elementary entities.
A mole is defined as the mass of a substance that has the same number of elementary particles as there are atoms in precisely 12.000 g of 12C.
In the periodic chart, group 11 includes the chemical elements roentgenium (Rg), copper (Cu), silver (Ag), and gold (Au). However, no chemical tests have yet been done to demonstrate that roentgenium behaves similarly to the heavier homologue of gold.
Thus, option B is correct.
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How many moles of Li3PO4 are in 2.2 L of a 0.6 M solution of Li3PO4? (remember Molarity=moles of solute/liters of solution)
Answer:
5 is the answer since I did this and got it rigt
PLS HELP Does anyone know the answer to the question on the bottom?????
Answer:
18 g...i think 90 percent sure its 18
Habitat loss due to the increasing human
population has caused
A. the number of extinctions to decrease
B. reductions in endangered species
C. increased biodiversity
D. decreased biodiversity
Answer:
D. decreased biodiversity
Explanation:
Habitat loss due to the increasing human
population has caused decreased biodiversity
Draw the principal organic product expected when 2-methylthiophene reacts with hno3. show minimized formal charges, if applicable.
Answer:
2-Methyl-5-nitrothiophene
Explanation:
The 2- and 5-positions of thiophene are the most susceptible to electrophilic aromatic substitution.
Thus, the major product from the reaction of 2-methylthiophene with HNO₃ in acetic acid is 2-methyl-5-nitrothiophene.
Why doesn’t alcohol freeze?
Answer: Because it's a combination of chemicals, vodka doesn't freeze at the same temperature as either water or alcohol. Of course, vodka will freeze, but not at the temperature of an ordinary freezer. This is because vodka contains enough alcohol to lower the freezing point of water below the -17°C of your typical freezer.
Explanation: .......
Find the pH of a 3.50 x 10^-4 M H2SO4 solution (sulfuric acid).
Answer:
3.46
Explanation:
-log(3.50*10^-4) = 3.46
Which technology is unted to service versand
Answer: a computer
Explanation:
What are five things gravity can do
when solid surfaces slide over each other, the kind of friction that occurs is _ friction
When solid surfaces slide over each other, the kind of friction that occurs is called Sliding Friction.
When you standardized the Na2S2O3, what molarity of Na2S2O3 did you obtain?
V(Na2S2O3): 6.5 ml
V(KIO3)L: 5.0 ml
stoichiometric factor ( number of moles of Na2S2O3 reacting with one mole of KIO3): 6
Answer:
0.46M NaS₂O₃ (Assuming KIO₃ solution with a concentration of 1.0M)
Explanation:
Based on the reaction:
6 Na₂S₂O₃ + KIO₃ + 5 KI + 3 H₂SO₄ → 3 Na₂S₄O₆ + 3 H₂O + 3 K₂SO₄ + 6 NaI
6 moles of Na₂S₂O₃ react per mole of KIO₃
Assuming the molarity of the KIO₃ solution is 0,1M:
Moles of KIO₃: = 5.0x10⁻³L ₓ (0.1 mol / L) = 5.0x10⁻⁴ moles
As 6 moles of thiosulfate reacted per mole of iodate:
5.0x10⁻⁴ moles KIO₃ ₓ (6 moles Na₂S₂O₃ / 1 mole KIO₃) =
3.0x10⁻³ moles of Na₂S₂O₃. In 6.5mL (6.5x10⁻³L):
3.0x10⁻³moles Na₂S₂O₃ / 6.5x10⁻³ L = 0.46M NaS₂O₃
no one's even answering, so i'll just uh leave this here
Answer:
answering what???
Explanation:
Answer:
I answered
Explanation:
For 1 dish of potato wedges, you will need 5 potatoes , 2tbs pepper, and energy. You need to make 80 batches of potato wedges. How many potatoes do you need? Do you have enough?
Answer: you will need 400 potatoes
Explanation:
How do you know that an acid based reaction is completely neutralized?
Answer:
When an acid and a base react with each other, a neutralization reaction occurs, forming a salt and water. The water forms from the combination of the H + ions from the acid and the OH - ions from the base. Strong acids and strong bases completely dissociate, so the reaction yields a solution with a neutral pH (pH = 7).
Explanation:
Iodine-131 is a radioactive isotope, and is often used in certain medical treatments. It has a short half-life of about 8 days. If a hospital has a 750mg sample of it available, how much would be available after 48 days?
Iodine-131 is a radioactive element which keeps on decaying over the time. Decay of radioactive element always comes under first order kinetics. Therefore 16.2mg mass would be available after 48 days if a hospital has a 750mg sample of it available.
What is half life?Half life tells about the time at which the radioactive material decays to half of its initial concentration.
Mathematically, for first order reaction, the relationship between half life and rate constant can be given as
[tex]t_{1/2} = \frac{0.693}{K}[/tex]
where k = rate constant
[tex]t_{1/2} \\[/tex]= half life= 8 days
Substituting the given values
k=0.693÷8 =0.08days⁻¹
[tex]k=\frac{2.303}{t}log\frac{a}{a-x}[/tex]
a= initial concentration
a-x = final concentration after 48 days
[tex]0.08=\frac{2.303}{48 }log\frac{ 750}{a-x}[/tex]
solving this we get
a-x= 16.2mg
Therefore, 16.2mg mass would be available after 48 days if a hospital has a 750mg sample of it available.
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A proton has _______ charge.
Answer:
positive
Explanation:
Explanation:
A proton has positive charge ...
How many moles are in 0.423 g of Ca
Help ASAP it’s pass due
Answer:
I think its city y, I don't know if its right though.
Explanation:
Find the specific heat of an unknown material with an initial temperature of 20°C, when 5000 Joules are applied to a 50 gram sample and the final temperature is 70°C
Answer:
2J/g°C
Explanation:
Q = 5000J
Initial temperature (T1) = 20°C
Final temperature (T2) = 70°C
Specific heat capacity (c) = ?
Heat energy (Q) = mc∇T
Q = mc∇T
Q = mc(T2 - T1)
5000 = 50 × c × (70 - 20)
5000 = 50c × 50
5000 = 2500c
c = 5000 / 2500
c = 2J/g°C
The specific heat capacity of the substance is 2J/g°C
4 × 10-5 cm in scientific notation
Answer:
400000
Explanation:
First, figure out what 10^5 is. It is 100000. Then multiply it by 4 and there is your answer!
Also if it is 4x10^-5, it is 0.00004!
Oh yeah! If you want it to be in scientific notation, it is: 4x10^5
Since that I didn't quite understand what you are trying to question, it is either 4x10^5 or 4x10^-5!
13) State four factors that can disrupt the
balance of the ecosystem-
Answer:
habitat change, climate change, invasive species, and pollution
Explanation:
Answer:
I’m looking for an answer aswell
Explanation:
A student claims that if she wanted to make a solution quickly, she should use small pellets instead of powder along with heating and stirring. Do you agree or disagree with the student's claim? This is kind of confusing for me so if anyone could help I would appreciate it : )
Answer: Yes we agree with the student's claim.
Explanation:
When the molecules are present in smaller size, more reactants can react as decreasing the size increases the surface area of the reactants which will enhance the contact of molecules.Hence, more products will form leading to increased rate of reaction.
On increasing the temperature will make more reactant molecules will have sufficient energies to cross the energy barrier and thus the number of effective collisions increases, thus leading to more products and increased rate of reaction.
When the solution is stirred , the molecule's kinetic energy and thus the rate of reaction increases.
Thus smaller size, stirring and increase of temperature will make the solution quickly.
Paratrooper not hurt while landing,why?
Answer:
Paratroopers not hurt while landing because when they get to the ground, they keep their knees and feet together helping them to land properly.
hope it helps!
Answer:
they usually land on their knees and roll
Explanation:
Can unit rate represent how much for one unit
Answer:A unit rate describes how many units of the first type of quantity corresponds to one unit of the second type of quantity. Some common unit rates are miles (or kilometers) per hour, cost per item, earnings per week, etc.
Explanation: hope this helps mark as brainiest