Answer:
The answer of this question is density
The chemical equation below shows the burning of magnesium (Mg) with oxygen (O2) to form magnesium oxide (MgO). 2Mg O2 Right arrow. 2MgO The molar mass of O2 is 32. 0 g/mol. What mass, in grams, of O2 is required to react completely with 4. 00 mol of Mg? 2. 00 grams 64. 0 grams 128 grams 256 grams.
Magnesium or metal reacts with oxygen to produce magnesium oxide or metal oxide. The mass of oxygen needed to completely react with magnesium is 64 g.
What is mass?Mass is the weight or the quantity of the substance that is estimated in grams and kilograms.
The balanced reaction can be given as:
[tex]\rm 2Mg + O_{2} \rightarrow 2MgO[/tex]
From the balanced reaction, 2 moles of magnesium and 1 mole of oxygen are required to produce 2 moles of magnesium oxide.
If 2 mol Mg requires 1 mol oxygen then, 4 mol Mg will need 2 mol of oxygen.
The mass of oxygen can be calculated as:
[tex]\begin{aligned}\rm mass &=\rm molar\; mass \times moles \\\\&= 32 \times 2\\\\&= 64 \;\rm gm\end{aligned}[/tex]
Therefore, option B. 64 gm of oxygen are required.
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A 5.00-wt% aqueous sulfuric acid solution (p=1.03 g/ml) flows through a 45-m long pipe with a 6.0 cm diameter at a rate of 82 L/min. a) What is the molarity of sulfuric acid in the solution? b) How long in seconds) would it take to fill a 55-gallon drum, and how much sulfuric acid (lbm) would the drum contain? c) The mean velocity of a fluid in a pipe equals the volumetric flow rate divided by the cross-sectional area normal to the direction of flow. Use this information to estimate how long (in seconds) it takes the solution to flow from the pipe inlet to the outlet.
Answer:
Explanation:
a )
5 gram of sulfuric acid in 100 gram of solution
volume of 100 gram of solution = 100 / 1.03 ml
= 97.08 ml = .097 L
5 gram of sulfuric acid = 5 / 98 moles = .051 moles
.051 moles in .097 L solution
molarity = .051 / .097 = .525 M .
b ) 55 gallon = 3.7854 x 55 L = 208 L
rate of flow = 82 L / min
time taken to fill the drum = 208 / 82 min = 2.536 min .
volume of sulfuric acid = 208 L
mass = volume x density = 208 x 1000 x 1.03 gram = 214.24 kg
214.24 kg = 214.24 x 2.2 lb = 471.33 lb
c )
cross sectional area = 3.14 x 3² = 28.26 cm²
rate of flow = 82 L / min = 82 x 1000 cm³ / min
= 82000 / 60 cm³ / sec = 1366.67 cm³ / s
velocity = 82 x 1000 / 1366.67 = 60 cm / s = .6 m / s
length of pipe = 45 m
time taken = 45 / .6 = 75 s
In which beaker or beakers are the particles moving the most slowly?
A. Beakers B and C
B. Beaker C only
C. Beaker a only
D. Beakers A and D
Answer: beakers A and D
Explanation:
These two beakers have the lowest temperatures, meaning the particles move slower than the other two beakers.
Answer:
A and D
Explanation:
what is the orbital diagram for silicon
Answer: Silicon the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for Silicon go in the 2s orbital. The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons.
Hope this helps! :)
28. The IUPAC name for OH is
(a) benzophenol
(b) hydroxyphenol
(c) hydroxybenzene
(d) phenol
Answer:
A
Explanation:
A negatively charged ion that has gained electrons to satisfy the octet rule
Anions. Some atoms have nearly eight electrons in their valence shell and can gain additional valence electrons until they have an octet. When these atoms gain electrons, they acquire a negative charge because they now possess more electrons than protons. Negatively charged ions are called anions.
Helppp mee plz guysss
Answer:
11 and a half
Explanation:
well it luks to be
Answer:
11.5 cm
Explanation:
jsosne92he9dbw9wns9wne9dbe8d
1. Which example below would not be found on primitive Earth?
volcanoes
lightning storms
oxygen gas
ammonia gas
2. Which event would have occurred by the end of the Hadean era?
Asteroid and comet bombardment had increased.
Earth’s crust had cooled and solidified
Lightning storms had stopped completely.
Free oxygen was available in the atmosphere.
3.
Classify Earth’s current atmosphere.
secondary atmosphere
quaternary atmosphere
primary atmosphere
tertiary atmosphere
Answer:
1. oxygen gas
2. Asteroid and comet bombardment had
increased
3. A secondary atmosphere is an atmosphere of a planet that did not form by accretion during the formation of the planet's star. A secondary atmosphere instead forms from internal volcanic activity, or by accumulation of material from comet impacts.
The climate of the Quaternary period showed several decreases in global temperature (glacial periods) separated by warm (interglacial) periods. Core samples taken from sea beds elude to at least sixteen glaciations during the Quaternary period.
A primary atmosphere is an atmosphere of a planet that forms by accretion of gaseous matter from the accretion disc of the planet's sun. Planets such as Jupiter and Saturn have primary atmospheres. Primary atmospheres are very thick compared to secondary atmospheres like the one found on Earth.
Now we have Earth's “third atmosphere,” the one we all know and love—an atmosphere containing enough oxygen for animals, including ourselves, to evolve. So plants and some bacteria use carbon dioxide and give off oxygen, and animals use oxygen and give off carbon-dioxide—how convenient!
What is occurring with the energy and molecules in a metal that is melting?
Answer:
Melting, or fusion, is a physical process that results in the phase transition of a substance from a solid to a liquid. This occurs when the internal energy of the solid increases, typically by the application of heat or pressure, which increases the substance's temperature to the melting point.
10.Which device is designed to produce
mechanical energy?
(1) a fan
(2) a battery
(3) a lamp
(4) an oven
Which device is designed to produce mechanical energy?
Well, mechanical energy is the sum of potential and kinetic energy. Kinetic energy is a unit of energy in which is the reason why an object does movement, while potential energy is another unit of energy in which is the reason why an object doesn't move, or stops. While you can stop a fan or a lamp, it isn't automatic. It's manually. So the answer is (4) an oven because mechanical energy happens automatically, not manually, or for a greater reason.
How many total atoms of Sodium are represented below
The surface tension of water _is because it's molecules form_.
Answer:
Hello! I am very sorry I do not know the exact answer to this but here is some information that may help!
Surface tension in water owes to the fact that water molecules attract one another, as each molecule forms a bond with the ones in its vicinity. This inward net force causes the molecules on the surface to contract and to resist being stretched or broken.
Explanation:
Again I am very sorry I could not give you the answer you were looking for. I hope the information above has helped you even a little! I am very sorry if this is not what you were looking for. Have a great rest of your day or night and good luck on your work!
<3 <3 <3
Which area is most likely to support a marsh ecosystem?.
Answer:
A location that is humid, would most likely support a marsh ecosystem.
Explanation:
The Florida Everglades are an example of a marsh :)
"Marshes are a type of wetland ecosystem where water covers the ground for long periods of time. Marshes are dominated by herbaceous plants, such as grasses, reeds, and sedges."
How much space does 750.00 g of a substance occupy it if has a density of 0.78 g/mL?
Answer:
The substance occupy 961.54 cm³ space.
Explanation:
Given data:
Mass of substance = 750.00 g
Density of substance = 0.78 g/mL
How much space it occupy = ?
Solution:
The space occupy by the substance is equal to its volume. Thus we will calculate the volume by applying density formula. Which is actually the space cover by substance.
d = m/v
d = density
m = mass
v = volume
0.78 g/mL = 750.00 g/ v
v = 750.00 g/ 0.78 g/mL
v = 961.54 mL
1 mL = 1 cm³
v = 961.54 cm³
Thus substance occupy 961.54 cm³ space.
In a chemical reaction, substance r reacts with compound xy to produce 47.0 g of compound rx. if the theoretical yield of rx is 56.0 g, what is its percent yield? use percent yield equals startfraction actual yield over theoretical yield endfraction times 100.. 9.00% 16.1% 83.9% 119%
The percent yield of the given reaction when substance r reacts with compound xy to produce 47.0 g of compound rx is 83.9%.
What is percent yield?Percent yield of any reaction will tells about the loss in the production of the propduct in terms of percentage by comparing the standard yield.
Percent yield will be calculated as:
% yield = (actual yield / theoretical yield) × 100
Given actual yield = 47g
Given theoretical yield = 56g
On putting tese values on the above equation, we get
% yield = (47/56) × 100 = 83.9%
Hence, correct option is (3) i.e. 83.9%.
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Answer:
83.9%
Explanation:
C. boiling
7
Which of these sentence is NOT true regarding heating a substance. *
(1 Point)
A. The speed of the particles increases
B. The space between the particles increases
C. The volume increases
D. The mass increases
Please help me
Answer:
Which of these sentence is NOT true regarding heating a substance?
Your answer is D.The mass increases
Under what conditions will a gas be most likely to exhibit the ideal gas properties predicted by the ideal gas law?
- High pressures and high temperature, because particles are forced closer together with higher kinetic energy, so intermolecular forces of attraction are weaker
- High pressure and low temperature, because particles are forced closer together and moving slower, so the volume of the particles is less significant
- Low pressure and high temperature, because particles are spread farther apart and moving faster, so the intermolecular forces of attraction are weaker
- Low pressure and low temperature, because particles are spread farther apart with lower kinetic energy, so the volume of the particles is less significant
Answer:
High pressure and low temperature, because particles are forced closer together and moving slower, so the volume of the particles is less significant
Answer:
A gas at very low volumes, when gas particles are very close together
A gas at very low temperatures, when gas particles have very little kinetic energy
A gas with highly polar molecules that have very strong inter-molecular forces
Explanation:
According to kinetic molecular theory:
a) Ideal gases have large number of particles which were considered to be hard spherical objects.
b) these gas particles move randomly in a straight line.
c) the path of gas particles change when they collide with each other or walls of vessel.
d) there is no or negligible inter molecular interactions between the gas particles.
e) the inter molecular distances is much higher than the size of particles.
f) the gas particles occupy negligible volume of the vessel.
g) during collision of gas particles is perfectly elastic.
h) the average kinetic energy of particles is constant at a constant temperature. It varies directly with the temperature.
How many Magnesium atoms are there in Mg(PO4)2?
Answer:
10
Explanation:
because 4 for 2 is 8 and the one invisible in p for 2 is 2, adding the 2+ 8 Is 10 are the atoms of Magnesium.
What is the relationship of moles of copper to moles of iron in a reaction between CuCl2 and Fe?
Chemistry
Equation: Fe+CuCl2>FeCl2+Cu
Someone help me please! I will mark brainliest if it’s right!
Answer:
a) compound
b)element
c)mixture
d)compound
Explanation:
Chemical reactions involve the rearrangement of atoms.
True
False
Answer:
True
Explanation:
In a chemical reaction, bonds between atoms in the reactants are broken and the atoms rearrange and form new bonds to make the products.
Answer:
true
Explanation:
chemical reactions use reactants, to form products, and the process involves rearranging atoms :)
Anyone know the answer to this question
Answer:
Construction
Explanation:
What evidence is there on the surface of the Earth of it's formation?
Answer: when the solar system settled into its current layout about 4.5 billion years ago, earth formed when gravity pulled swirling gas & dust in to become the third planet from the sun. like its fellow terrestrial planets, earth has a central core, a rocky mantle, & a solid crust.
The chemical equation below shows the decomposition of nitrogen triiodide (ni3) into nitrogen (n2) and iodine (i2). 2ni3 right arrow. n2 3i2 the molar mass of ni3 is 394.71 g/mol. how many moles of i2 will form 3.58 g of ni3? 0.00907 moles 0.00940 moles 0.0136 moles 0.0212 moles
The moles of diiodine is formed from the nitrogen triiodide is 0.0212 moles.
How we calculate moles from mass?Relation between the moles and mass of any substance will be represented as:
n = W/M, where
n = moles
W = given mass
M = molar mass
Given chemical reaction is:
2NI₃ → N₂ + 3I₂
Moles of 5.58g of NI₃ will be calculated as:
n = 5.58g / 394.71g/mol = 0.0141 mole
From the stoichiometry of the reaction, it is clear that:
2 moles of NI₃ = produce 3 moles of I₂
0.0141 moles of NI₃ = produce 3/2×0.0141=0.02115 = 0.0212 moles of I₂
Hence option (4) is correct i.e. 0.0212 moles.
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Answer:
C
Explanation:
Right on edge 2022
There are three subatomic particles found inside atoms. Two of the subatomic particle have a charge of positive or negative. The one particle that does NOT have a charge is the:
A,proton
B, neutron
C, electron
D, none of the above
Answer:
neutron, and the way I remember that is because NEUTron is NEUTral
Explanation:
proton are positive (both start with a 'p') and electrons are negative
Gravity is an example of what
Answer:Some examples of the force of gravity include;
-The force that holds the gases in the sun.
-he force that causes a ball you throw in the air to come down again.
-The force that causes a glass you drop to fall to the floor.
-The force that keeps the Earth and all of the planets in line in the proper position in their orbits around the sun.
-The force that causes an apple to fall downward from an apple tree.
-he force that keeps you walking on Earth instead of floating away into space.
A bird flies from its nest to a lake for food and water. The nest and lake are 2 miles apart. It takes the bird 10 minutes to get from the nest to the lake. What is its average speed in mi/min?
what happens when throw up then eat it again?
2. A submarine is able to raise and lower itself
underwater. A rock sinks when it is dropped in a
pool because it is denser than water. A piece of
wood floats in the pool because it is less dense
than water. What could the submarine change in
order to sink or float? Choose all that apply.
A. the submarine's volume
B. the submarine's mass
C. the state of the surrounding water
D. the mass of the surrounding water
Answer:
I think it's the state of the surrounding water because if the water holds impurities it will float and if it doesn't have impurities it will sink
A submarine is able to raise and lower itself underwater. A rock sinks when it is dropped in a pool because it is denser than water. A piece of wood floats in the pool because it is less dense than water. If we want to change in sink or float of submarine then we must change the state of surrounding water. Thus, option c is correct.
How a submarine is float in water while a small stone is sink in water?According to Archimedes's principle the upward buyout force that is exerted on a body immersed in a fluid whether fully or partially, is equal or less than the fluid that the body displaces.
Mathematically
Buyout force = Fb=-pgv
Where
p= density of fluid
g= acceleration due to gravity
v = Volume of fluid
So, if a object is floating in the water then buyout forces must be equal to their weight, and for that weight of water that is displaced by object must be greater than or equal to the weight of object. So object is floating.
Therefore, a submarine is able to raise and lower itself underwater. A rock sinks when it is dropped in a pool because it is denser than water. A piece of wood floats in the pool because it is less dense than water. If we want to change in sink or float of submarine then we must change the state of surrounding water. Thus, option c is correct.
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20pts!!!! Plutonium will go through alpha decay. Which nuclear equation is correct?
Answer:
by my knowledge, i think it is the 3rd option.
Explana tion: