Answer:
4Fe+3O2------>2fe2O3
Explanation:
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Explanation:
convergent-plate slides beneath the other
divergent-plates move away from each other
transform-2 plates slide past each other
Air does not have a chemical symbol or formula. Why?
1)It contains different amounts of water depending on where you are.
2)Air is not a pure substance.
3)It depends on the temperature.
4)It depends on how far above sea level you are.
Answer:
2. Air is not a pure substance
Explanation:
Air does not have a chemical symbol or formula because air is not a pure substance (option 2).
What is air?Air is a mixture of different gases. A mixture is a substance that constitutes other compounds that are not chemically bonded together.
This means that air as a mixture is made up of different gaseous components that possess their own individual identity.
Atmospheric air is composed of the following different constituents;
78% nitrogen21% oxygenSmall amounts other gases including carbon dioxide, neon, and hydrogen etc.This shows that air is not a pure substance and accounts for the reason why air does not have a definite chemical formula or symbol.
Therefore, option 2 is correct.
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Which receives the most solar radiation?
a. the oceans
b. the polar zones
C. the temperate zones
d. the tropics
Answer:
D
Explanation:
tropical areas receives the most solar radiation because the sun's rays are nearly perpendicular to the earths surface
What category of elements is characterized by the filling of d orbitals?
Halogens
Alkali Metals
Transition Metals
Alkaline Earth Metals
Explanation:
Transition Metals are characterized by the filling of d orbitals?
My car has an internal volume of 3,600 L. If the sun heats my car from a temperature of 18.0 degrees Celsius to a temperature of 45.0 degrees Celsius, what will the pressure inside my car be? Assume the pressure a was initially 101.3 kPa.
Answer:
110.7 kpa or 1.097 atm your choice of pressure units
Explanation:
We can assume the Volume is constant since we are not told other wise and it is indeed a car. We can Use P1/T1= P2/T2
So (T2xP1 )/ T1 = P2
(318Kx101.3kpa)/291k = 110.7 kpa or 1.097 atm your choice of pressure units
if your wondering why i used Kelvin gas laws are always in units of Kelvin
Which of the following organ is NOT part of the Urinary system?
A. Kidney
B. Bladder
C. Brain
D. Urethra
Answer:
Explanation:C
Explain why the noble gases are unusually stable.
Answer:
Noble gases are the least reactive of all elements. That's because they have eight valence electrons, which fill their outer energy level. This is the most stable arrangement of electrons, so noble gases rarely react with other elements and form compounds.
Explanation:
A galaxy is 650 million light years away. Based on Hubble's Law, how quickly is
that galaxy moving away from us?
a.29.5km
b..33km
c.572km
d.14300km
which of the following will react with a solution of zinc sulphate fastest ?
A. Potassium
B. Aluminum
C. Magnesium
D. Copper
Answer:
C. Magnesium
Explanation:
Zinc sulphate (ZnSO4) will react fastest with Magnesium (Mg) because magnesium is more reactive than Zinc and other given elements.
Zinc sulphate (ZnSO4) reacts with Magnesium (Mg) and undergo displacement reaction. Zinc is displaced by magnesium and form Magnesium Suphate (ZnSO4).
ZnSO4 + Mg => MgSO4 + Zn
Kai was 200 meters north of the library when he remembered he had to return some books to the library. It took him 200 seconds to do the round trip. Which best describes Kai's roundtrip?
Answer:
His speed was 2 m/s, and his velocity was 0
Explanation:
In physics, speed of an object is defined as the change in position with the change in its time. While velocity may be defined as the change in the position of the body with respect to the time taken.
Speed in a scalar quantity which means it has only magnitude while velocity has both magnitude and direction.
To determine change in velocity both direction as well as magnitude has to be changed.
In the context, Kai was 200 m of the library in the north direction. Now for the round trip to the library and back to his position, Kai took 200 seconds time to cover the distance.
So for the round trip, the speed of Kai would be 2 m/s abut the velocity of Kai is 0 as the displacement of Kai is 0.
Answer:
speed 2 m/s, his velocity 0
: B
1. What kind of energy is inside the child on the bike?
Answer:
Cuando uno monta en bicicleta, el cuerpo convierte la energía química de los músculos para producir energía mecánica.
Explanation:
What is the best method of eye protection in laboratory?
Answer:
goggles
Explanation:
...................
If the pH is decreased from 7 to 6, it means that the
1..concentration of Hydrogen ions is 10 less
2...concentration of Hydrogen ions is 10 more
3.it is the same
Answer:2...concentration of Hydrogen ions is 10 times more
Explanation:
How many atoms of Hydrogen are in 4 C3H5O12? (10 points)
Answer:
There are 20 atoms in hydrogen.
Explanation:
Multiply Coefficient with Hydrogens subscript. In this case the coefficient is a 4 so you multiply that with Hydrogens subscript which is 5. So it would be (4)(5)=20
Which phrase describes a polymer? A. a branching structure containing 10 carbon atoms and 22 hydrogen atoms B. a crystal containing many sodium ions and many fluoride ions C. a long chain of carbon atoms with hydrogen atoms attached to them D. a molecule containing six carbon atoms arranged in a ring structure E. a single atom of calcium bonded to two atoms of chlorine
Answer:
C. A long chain of carbon atoms with hydrogen atoms attached to them
Explanation:
For example, the main component of flour is starch and starch is a polymer.
Now, Starch is a polymeric carbohydrate that consists of a large number of glucose units which are bonded by chemical bonds known as glycosidic bond. It's also known that Starch is a white, tasteless and odorless powder that is not soluble in alcohol or even cold water.
Thus, we can say that polymer is a long chain of carbon atoms with hydrogen atoms attached to them.
Option C is correct.
Answer:
C. A long chain of carbon atoms with hydrogen atoms attached to them
Explanation:
For example, the main component of flour is starch and starch is a polymer.
Now, Starch is a polymeric carbohydrate that consists of a large number of glucose units which are bonded by chemical bonds known as glycosidic bond. It's also known that Starch is a white, tasteless and odorless powder that is not soluble in alcohol or even cold water.
Thus, we can say that polymer is a long chain of carbon atoms with hydrogen atoms attached to them.
The tire pressure in a automobile tire was 2.38 atm when the tire was at 26°C. As the automobile drove for several hours, the temperature of the tire increased to 93°C.
35 atm
41.0 atm
2.91 atm
3.09 atm
33 atm
Answer:
The answer is 2.91 atm
Explanation:
In guinea pigs, the allele for a black coat is dominant over the allele for a white coat. What color is a guinea pig with one allele for a black coat and one allele for a white coat?
A.
black
B.
gray
C.
white
D.
black and white
Which element has the smallest atomic radius?
A-Na
B-H
C-Li
D-K
Answer:
B Hydrogen
Explanation: Hydrogen is the smallest element.
need help ASAP , anybody
- 20 points
Answer:
i think it is b im not sure
Explanation:
HELP NEEDED ASAP
What mass of Al is produced when 0.500 mole of Al2 S3 is completely reduced with excess H2? (At. Masses of Al=27, S=32, H=1)
Select one:
a. 13.5 g
b. 27.0 g
c. 2.7 g
d. 54.0 g
According to the periodic table, which statement
correctly describes the change from a neutral atom
of an element to its ion?
A. A fluorine atom forms a F-' ion by losing
one electron.
B. A sodium atom forms a Nation by losing
two electrons.
C. A magnesium atom forms a Mg+2 ion by
gaining two electrons.
D. A phosphorus atom forms a p- ion by
gaining three electrons
ASAP pleaseee and Thankyou
Answer:
i think 50%
Explanation:
Explain why non-metals tend to be poor conductors using the term electronegativity.
Explanation:
Components that throughout chemical processes appear to acquire electrons to achieve anions are considered non-metals. These were all elements which are electronegative. Those who are – anti conductors of electricity and heat, fragile and disadvantaged.
Why was it important to decide between the lunar orbit Rendezvous method and the earth orbit rendezvous method near the beginning of project apollo?
A. Engineers could not decide which method to use until they had built and tested the lunar miss vehicle.
B. Engineers could not start designing the spacecraft until they knew set of constraints to follow.
C.Engineers could not determine the goals of project apollo until they figured out how to get to the moon and return safely to earth?
what answer is it?!! pls answer fast!!!!
It was important to decide between the lunar orbit Rendezvous method and the earth orbit rendezvous method near the beginning of project Apollo because Engineers could not decide which method to use until they had built and tested the lunar miss vehicle and is therefore denoted as option A.
What is Apollo?This was a scientific exploration of the Moon in which instruments were deployed to measure the distance from the Moon to the Earth.
This was also set up in other to measure the Moon's seismic activity and involved the use of spacecraft but there was difficulty in selecting between the lunar orbit Rendezvous method and the earth orbit rendezvous method near the beginning of project Apollo.
This was because if the earth orbit rendezvous failed, the threatened astronauts could be brought back home easily while if a rendezvous around the moon failed, the astronauts would be too far away to be saved which is therefore the reason why option A was chosen as the correct choice.
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The speed (c) of a wave =
Answer:
the case of a wave, the speed is the distance traveled by a given point on the wave (such as a crest) in a given interval of time. In equation form, If the crest of an ocean wave moves a distance of 20 meters in 10 seconds, then the speed of the ocean wave is 2.0 m/s.
Explanation:
16 grams of propane, C 3 H 8 and 20 grams of oxygen, O 2 are reacted to produce carbon dioxide and water. Calculate the volume of CO 2 produced?
Answer:
The volume of CO₂ produced is 8.4 L
Explanation:
The mass of propane in the reaction C₃H₈ = 20 grams
The mass of, oxygen, O₂ in the reaction = 20 grams
The produce of the reaction are carbon dioxide, CO₂ and water, H₂O
The balanced equation of the (combustion) reaction can be presented as follows;
C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g)
Therefore, one mole of propane, C₃H₈, reacts with five moles of oxygen, O₂, to produce three moles of carbon dioxide, CO₂, and four moles of water molecules, H₂O, as steam
The number of moles = Mass/(Molar mass)
The molar mass of propane, C₃H₈ = 44.1 g/mol
The number of moles of propane in 16 grams of propane = 16/44.1 ≈ 0.3628 moles
The molar mass of oxygen, O₂ = 32.0 g/mol
The number of moles of oxygen in 20 grams of propane = 20/32 ≈ 0.625 moles
Therefore;
Given that 1 mole of C₃H₈ reacts with 5 moles of O₂
1 mole of O₂ will react with 1/5 moles of C₃H₈
0.625 moles of O₂ will react with 0.625/5 = 0.125 moles of C₃H₈ to produce 3 × 0.125 = 0.375 moles of CO₂
1 mole of an ideal gas occupies 22.4 L at standard temperature and pressure
Taking CO₂ as an ideal gas, we have;
0.375 mole of CO₂ will occupy 0.375 × 22.4 L = 8.4 L
Therefore, the volume of CO₂ produced = The volume occupied by the 0.375 moles of CO₂ = 8.4 L.
HOW MANY LITERS ARE IN 7110.5 mL? WHAT IS THE UNIT?
Which of the following describes redox in displacement plating?
A) The Metal A ion is oxidized and Metal B is reduced.
B) The Metal A ion is reduced and Metal B is oxidized.
C) Displacement plating does not involve a change in oxidation states.
Answer:
B) The Metal A ion is reduced and Metal B is oxidized.
Explanation:
When we think of electroplating, we often think of a set up in which there is a nonsponteanous reaction driven by the presence of a cell.
However, in displacement plating, a cell is not involved. Metals are chosen based on their respective position in the electrochemical series.
For instance, silver can be coated on copper by immersing the copper rod into a silver ion solution. The copper rod becomes oxidized. The silver ions accept electrons and become deposited on the copper rod.
Can someone help me out with this thanks!
Answer:
a) Hydrogen and Fluorine
b) Lithium and Oxygen
c) Potassium and Phosphorus
d) Nickel and Oxygen
e) Mercury and Chlorine
Explanation:
The capital letters in the compounds represent a single element, while some elements have one capital letter and one small letter after it.
a) H & F
b) Li & O
c) K & P
d) Ni & O
e) Hg & Cl
What effect does an increase in products have on the reaction rate of a mixture at equilibrium?
Rate of reaction will decrease if there is an increase in product concentration.
If one (or more) of the reactants or products concentrations are raised, the equilibrium will change to lower the concentration. Alternately, if the temperature is lowered, the equilibrium will change to favor the exothermic process, which will raise the temperature.
The rate of the reaction will frequently rise as one or more of the reactants are concentrated more. This happens as a result of the fact that a reactant collides more frequently over time at increasing concentrations.An increase in a products concentration will result in a decrease in the total quantity of products and an increase in the total number of reactants. That is the reaction will move backwards.Hence, there is decrease in rate of reaction as the product concentration increases.
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