Answer:Hydrogen
Explanation:is the most abundant element in the universe (75%by weight or 88% of all of the atoms of the universe)
What causes metamorphic rocks to form from cristing rocks?
A.magma and minerals
B.heat and pressure
C.exposure to Earth's mantie
D.exposure to Earth's surface
Answer:
B.heat and pressure
Explanation:
Answer:
The answer is B.
Explanation:
Metamorphic rocks are formed due to heat and pressure, that is acting on it .
The diameter of a circular swimming pool is 12 feet. Find circumference Round to the nearest tenth . Use 3.14 for pi
Answer:
the pool's circumference is 37.7 ft^2 (rounded to nearest tenth).
Which has the highest rate of effusion oxygen or hydrogen
Answer:
Hydrogen has the highest rate of effusion
Can matter every be destroyed? Why or why not?
Hey
Matter can neither be created nor destroyed.
Explanation:
This is the law of conservation of matter (mass). One can prove this by performing a simple experiment at home.
Have a great day
Grinding a seltzer tablet into powder increases the rate of reaction due to an increase of which factor?
Temperature
Surface area
Reactants
Concentration
Answer:
Surface area
Explanation:
The rate of a chemical reaction is increased when the surface area of a solid reactant is increased. This can be done by cutting the substance into small pieces, or by grinding it into a powder. If the surface area of a reactant is increased, it implies more particles are exposed to the other reactant.
When a seltzer tablet is ground into powder, the idea is to expose more of its surface to the other reactant. Since rate reaction depends on effective collision between reactants, more exposed particles implies a greater degree of collision between reactants and a faster rate of reaction.
Answer:
the answer is the second option got it right so do worry
Explanation:
hope this helps
mention two instruments that could be used to transfer sodium hydroxide solution into conical flask
Answer:
Pipette and Burettes
Explanation:
The two instruments that can be used for
a) Pipette – It is used to dispense measured volume of any liquid into any other equipment. Pipette works on the concept of creating a partial vacuum to take in the liquid and then release the volume to dispense the liquid.
b) Burettes – It has a stopcock that regulate the release of liquid. It is larger than the pipette and works as a graduated cylinder.
If O2(g) reacts with H2(g) to produce H2O, what is the volume of H2O obtained from 1 L of O2?
Hint: Write a balanced equation first!
Answer:
2L
Explanation:
We'll begin by writing the balanced equation for the reaction this is illustrated below:
2H2 + O2 —> 2H2O
1 mole of a gas occupy 22.4L.
1 mole of O2 occupy 22.4L.
2 moles of H2O occupy = 2 x 22.4 = 44.8L.
From the balanced equation above,
22.4L of O2 produced 44.8L of H2O.
Therefore, 1L of O2 will produce = 44.8/22.4 = 2L.
Therefore, 1L of O2 will produce 2L of H2O.
what percentage of water on earth is fresh water
Answer:
only 2.5% is fresh water on earth
Answer:
The answer is 3%
Explanation:
In the following reaction 6.13g of water (H2O) is produced the theoretical
yield of water (H2O) is 8.17g, what is the percent yield of water? *
C3H8+5 02 3 CO2 + 4 H2O
A) 85.0%
B) 72.0%
C) 75.0%
D) 67.0%
Answer:
C = 75%
Explanation:
Theoretical yield = 8.17g
Actual yield = 6.13g
To calculate the percentage yield of a compound in a reaction, we'll use the formula to calculate it
Percentage yield = (actual yield / theoretical yield) * 100
% yield = (6.13/8.17) * 100
Percentage yield = 0.7503 * 100
Percentage yield = 75.03%
5. On what organ does alcohol have the most noticeable effect?
Answer:
the liver
Explanation:
it processes alcohol, work very hard
How much H2 is generated from the electrolysis of 150 grams of H2O
Jenna is playing with her toy cars, which are both the same size. She pushes the red car with a strong push. She pushes the blue car with a weak push. What should Jenna expect to observe?
Answer:
red car will travel a much farther distance and at a faster speed as opposed to the blue car
Explanation:
Based on the information provided within the question Jenna can expect to observe that the red car will travel a much farther distance and at a faster speed as opposed to the blue car which will travel a shorter distance and at a lower speed. This is mainly because Jenna is applying an increased amount of force on the red car thus creating more acceleration and ultimately increasing the distance.
Which of the following human activities can increase the risks of flooding?
deforestation i hope this helps
Answer:
Deforestation and Cultivation
Explanation:
First I am going to give the definition of deforestation:
Deforestation is basically the removal of trees.
The removal of trees leaves leaves very little vegetative cover to hold heavy rain fall. This is why mudslides and things happen. When the land is clear and flat, the water keeps on going instead of going into the soil. That water that keeps on going is called runoff water. If we planted trees by the rivers, that could take down the height of the floods in towns by 20%
At first I was going to say widening rivers, but that is a way to manage river water. When we lengthen the river, it is so that the water can take more time to reach the river canal.
Definition of Cultivation: The production of food by preparing the land to grow crops (especially on a large scale) animal husbandry - breeding and caring for farm animals. agriculture, tree farming - the cultivation of tree for the production of timber.
I was also going to say Cultivation. Over-cultivation is the excessive use of farmland to the point where productivity falls due to soil exhaustion or land degradation. Now this is actually why we have floods in the USA. The soil cannot soak up any water, therefore the water over flows and that is when a flood starts to happen.
I know this took some time but hope I could help :)
Sarah, Leah, Haley, Lindsay, and Kim bought 4 bottles of water to share among themselves. They divided each bottle of water into 5 equal portions. Sarah took 1 portion from each bottle of water.
Answer:
4/5 of a bottle
Explanation:
Sarah, Leah, Haley, Lindsay, and Kim bought 4 bottles of water to share among themselves. They divided each bottle of water into 5 equal portions. Sarah took 1 portion from each bottle of water. Which equation represents how much of a bottle of water Sarah took?
Sarah must have taken 4/5 of a bottle
First, the 4 bottles of water were divided into 5 equal portions;
4 x 5 = 20 portions.
Sara too 1 portion from each bottle;
1 portion x 4 bottles = 4 portions
Which equation represents how much of a bottle water Sarah took?
Since each bottle water was divided into 5 equal proportions and assuming that the bottle waters are of the same volumes, then Sarah has taken 4 out of 5 portions of a bottle water.
Answer: 4 ÷ 5 ﹦4/5 ♡♡♡
Explanation: When you see eqautions like these, always remember that the first number goes on the top and the second one goes on the bottom. Hope this helps! (～﹃～)~Hi☆
What mass of sulfuric acid (H2SO4) is contained in 50.00 mL of a 5.85 M solution? grams
Answer:
28.69 grams
Explanation:
To find the mass, we first need to find the moles. Once we have the moles, it is easy to use the molar mass of H2SO4 to find its mass.
To find the moles, remember that molarity (M) is equal to the moles divided by the volume (L). The volume HAS TO be converted to liters!
M = moles / V
5.85 M = moles / 0.05 L
moles = 0.2925
Now we know that we have 0.2925 moles of sulfuric acid. The molar mass of sulfuric acid is 98.08 g/mol.
0.2925 moles * (98.08 g / mol) = 28.69 grams
Make sense? If you have any questions, don't hesitate to ask!
What volume of 0.125 M HCl is needed to titrate 50.0 mL of 0.0500 M NH3 solution ?
Answer:
20
Explanation:
A gas occupies 11.2 liters at 0.860 atm. What is the pressure if the volume is doubled?
Answer:
.43 atm
Explanation:
11.2 x .860 = ans./22.4
We can check this by knowing that P and V at constant T have an inverse relationship. Therefore, this answer is correct.
- Hope that helps! Please let me know if you need further explanation.
HELP MEHHHHH were does the first stage of cellular respiration occur ?
Answer:
mitochondria
Explanation:
Cellular respiration occurs primarily in the mitochondria of your cells. The mitochondria is like the powerhouse of cells .
Can someone answer these questions for me please?
15. Use bond energies to determine the ∆H for the combustion of methane (CH₄).
16. Use Hess's law to determine the ∆H for the combustion of liquid methanol (CH₃OH).
17. Using your answers from question 16, how much energy will you get from burning 245.0 g of methanol in excess oxygen?
18. The ∆S is 209.6 J/K for the following reaction:
C₂H₄ (g) + 3O₂ (g) → 2CO₂ (g) + 2H₂O (g)
• What is the absolute entropy of O₂ (g)?
19. What is ∆G for the following reaction at 298 K?
2C₆H₆ (l) + 150₂ (g) → 12CO₂ (g) + 6H₂O (g)
20. If a reaction has a ∆H of -120.0 kj/mole and is spontaneous for all temperatures less than 200.0 K, what is ∆S?
Answer:
wowits too long
Explanation:
Why is fusion not used to generate electrical power ?
Answer:
Fusion doesn't produce runway chain reactions the way fission can, so there's no need to worry about meltdowns.
the SI unit for forces is it a newton, force, unbalanced forces, balanced forces, net forces pick on I need you help
Answer: The SI unit for force is Newtons (N).
Cylinder A contains a gas whose molecules have an average speed of 0.0000001 meters/sec. Cylinder B contains a gas whose molecules have an average speed of 0.3 meters/sec. Select the statement below that is true regarding these cylinders. options: Cylinder A contains a gas that has a temperature closest to absolute zero. Even though the molecules are moving at different speeds in the two cylinders, they have the same kinetic energy. Cylinder B contains molecules that are moving more slowly than the molecules in Cylinder A. Cylinder B contains a gas that has a temperature closest to absolute zero.
Answer:
The correct option is;
Cylinder A contains a gas that has a temperature closest to absolute zero
Explanation:
From the kinetic theory of gases, the average speed of a gaseous molecule is found from the following equation;
[tex]v_{rms} = \sqrt{\frac{3\cdot R \cdot T}{MW} }[/tex]
Where:
[tex]v_{rms}[/tex] = rms speed which is the square root of the average of the velocities of the gas molecules squared which is used in place of the average of the gas molecules as the sum of the velocities of all the gas molecules in the cylinder is zero
R = Universal gas constant = 8.3145 J/(mol·K)
MW = Molecular weight of the gas
Hence where we have;
[tex]v_{rmsA}[/tex] = Average velocity of gas A = 0.0000001 m/s
[tex]v_{rmsB}[/tex] = Average velocity of gas B = 0.3 m/s
Since, R and MW are constant for the gas in cylinder A constant, therefore, as [tex]v_{rmsA}[/tex] ≈ 0 m/s, the temperature, [tex]T_A[/tex], of gas A is closest to absolute zero.
(02.02 MC)
How is Earth's surface most likely to change in a place that experiences strong sand storms?
Answer:
Mechanical weathering will cause wearing down of rocks.
Explanation:
All the other choices aren't suitable for a dry climate where sand storms occur.
What is the name for a star that has two shells of hydrogen and helium undergoing fusion?
A.
asymptotic giant branch star
B.
supergiant
C.
hypergiant
D.
supernova
Answer:
I am not so sure but I think it is A.
Explanation:
If i got it wrong sorry.... :(
Answer:
the answer is A hope it helps
For the following reaction, if you have 13.2 g of CO and 42.7g of Fe2O3, which is the limiting reagent with regards to Fe production?
Fe2O3 (s) + 3 CO (g) _______> 2 Fe (s) + 3 CO2 (g)
Answer: [tex]CO[/tex] is the limiting reagent and [tex]Fe_2O_3[/tex] is the excess reagent.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} Fe_2O_3=\frac{42.7g}{159.69g/mol}=0.267moles[/tex]
[tex]\text{Moles of} CO=\frac{13.2g}{28g/mol}=0.471moles[/tex]
The given balanced equation is :
[tex]Fe_2O_3(s)+3CO(g)\rightarrow 2Fe(s)+3CO_2(g)[/tex]
According to stoichiometry :
3 moles of [tex]CO[/tex] require = 1 mole of [tex]Fe_2O_3[/tex]
Thus 0.471 moles of [tex]CO[/tex] will require=[tex]\frac{1}{3}\times 0.471=0.157moles[/tex] of [tex]Fe_2O_3[/tex]
As given amount of [tex]Fe_2O_3[/tex] is more than the required amount , it is the excess reagent.Thus [tex]CO[/tex] is the limiting reagent as it limits the formation of product.
Identify three details for how the Earth and Moon are different
formula of silver nitrite
Answer:
AgNO₃
Explanation:
Ag = Silver
NO₃ = Nitrate
Base your answer on the pedigree chart below and on your knowledge of biology. The pedigree chart represents the inheritance of color blindness through three generations. Mary and Steve are expecting another child. What is the probability that the new baby will be colorblind
Answer:
1/2 or 50%
Explanation:
The probability would be 1/2 or 50%.
Color blindness is generally an X-linked recessive traits. Since males only have one X chromosome, they are either affected or not affected but females with two X chromosomes can be a carrier in addition to being affected or unaffected.
Also, males usually get their X chromosomes from their mothers while the two X chromosomes in females are contributed by each parents.
Let the allele for colour blindness be b.
Genotype of Steve would be [tex]X^bY[/tex]
Since, they produced a male child with color blindness, Mary is a carrier with the genotype: [tex]X^BX^b[/tex]
[tex]X^bY[/tex] x [tex]X^BX^b[/tex]
progeny: X^BX^b (carrier female), X^bX^b (affected female), X^BY (unaffected male), and X^bY (affected male)
Probability of producing color blind children = 2/4 = 1/2
Hence, the probability of their new born baby being color blind remains 1/2 or 50%
3. How does heat travel by conduction?
Conduction is the movement of heat through a substance by the collision of molecules. At the place where the two object touch, the faster-moving molecules of the warmer object collide with the slower moving molecules of the cooler object.
Answer:
In CONVECTION
Explanation:
Heat energy is carried by the movement of particles of matter. In CONDUCTION, heat is transferred by particles vibrating. In RADIATION, heat is carried directly by electromagnetic waves. When a hot object touches a cool object, heat moves from the hot one to the cool one.
10) Intravenous saline solutions have a concentration of 1.5 M NaCl. How many liters of saline can be prepared from 50.0 g of NaCl?
Answer:
0.57 mol/L
Explanation:
Molarity (M) is defined as the number of moles of solute per liter of solution (moles/Liter).
Molarity = [tex]\frac{moles of solute}{liters of solution}[/tex] or Moles = molarity × litres
so, the mass of Nacl in 1 mol is 58.44 g,
Moles of NaCl = 50.0g x 1 mole NaCl / 58.44 g
= 0.855 mol NaCl
Moles = molarity × litres
0.855 = 1.5 M x L
L = 0.57 mol/L
Hence, 0.57 mol/L can be prepared from 50.0 g of NaCl.
