At stp how many liters of oxygen are required to react completely with 3.6 liters

Answers

Answer 1

Answer: If it is assumed that this reaction is taking place at STP (standard temperature and pressure) then one mole of gas occupies 22.4L

You can then calculate that 3.6L of Hydrogen contains 0.16mol
1mol/22.4L x 3.6L = 0.16mol

Every 2 moles of Hydrogen require 1 mole of oxygen to form water. Therefore half of the number of moles of oxygen are required.
0.16mol/2 = 0.08mol

Again, we know that at STP 1 mol occupies 22.4L
0.08mol x 22.4L/mol = 1.79L of O2 needed.

Also 3.6/2 = 1.8 All ideal gasses will occupy the same ammount of space at STP

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In which of these situations is convection most likely the main form of heat transfer?Warm air from a heater on the first floor of a house moves to the upper floors.

The sides of a metal pan become hot when the pan is placed on a stove burner.

A person gets a sunburn from lying on the beach too long.

An ice cube melts when a person holds it in his hand.

Answers

In the first situation: the mechanism of covection is the main form of heat transfer when warm air from a heater moves around and upward.

In the case of the metal pan the mechanism of heat transfer is conduction.

In the case of sunburn the mechanism is radiation.

In the case of an ice cube melting in a hand, conduction is the most important mechanism.

Answer:

An ice cube melts when a person holds it in his hand.

Explanation:

In which sample of water do the molecules have the highest average kinetic energy?(1) 20. mL at 100.°C (3) 60. mL at 60.°C
(2) 40. mL at 80.°C (4) 80. mL at 40.°C

Answers

The answer is (1). The question is asking the average kinetic energy. So it does not related with volume. When temperature increases, the kinetic energy will also increase. So the answer should be the highest temperature.

Which of the following is TRUE about a physical change in matter?O A physical change changes the identity of the substance
O A physical change does not change the chemical formula of the substance
O A physical change has similar characteristics as a chemical change.
A physical change is a change in how the substances react with other substances.

Answers

The correct answer is physical change does not change the chemical formula of the substance.

What is a physical change?

A physical change is one in which only the physical state of matter is altered.
Its chemical characteristics have not changed.
A physical change is usually brought about by increasing the temperature or exerting pressure, or both.
The original state of matter is restored by reversing the condition, that is, lowering the temperature, lowering the pressure, or both.
Physical changes, in other words, are reversible.

Learn more about Physical change here:

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Answer:

B. a physical change does not change the chemical formula of the substance

Explanation:

Physical change does not change the substance or identity of an object

The reaction of Cr2O3 with silicon metal at high temperatures will make chromium metal.2Cr2O3(s)+3Si(s) -------> 4Cr(l)+3SiO2(s)

The reaction is begun with 161.00 g of Si and 139.00 g of Cr2O3.

How many grams of the excess reactant is left after the reaction is complete?

Answers

Answer: 122.9 g of $Si$ will be left from the given masses of both reactants.

Explanation:

$2Cr_2O_3(s)+3Si(s)\rightarrow 4Cr(l)+3SiO_2(s)$

To calculate the moles :

$\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}$

$\text{Moles of} Cr_2O_3=(139.00)/(152)=0.91moles$

$\text{Moles of} Si=(161.00)/(28)=5.75moles$

According to stoichiometry :

2 moles of $Cr_2O_3$ require 3 moles of $Si$

Thus 0.91 moles of $Cr_2O_3$ will require= $(3)/(2)* 0.91=1.36moles$ of $Si$

Thus $Cr_2O_3$ is the limiting reagent as it limits the formation of product and $Si$ is the excess reagent.

Thus (5.75-1.36) = 4.39 moles of excess reagent.

Mass of $Si=moles* {\text {Molar mass}}=4.39moles* 28g/mol=122.9g$

Thus 122.9 g of $Si$ will be left from the given masses of both reactants.

1 What do strong acids and strong bases have in common?A They both partially dissociate, with reverse reactions occurring.
B They both dissociate completely, with little or no reverse reactions.
C They both remain intact when placed in water, with no dissociation taking place.
D They both dissociate completely, with reverse reactions constantly taking place.

2 What happens when the kinetic energy of molecules increases so much that electrons are released by the atoms, creating a swirling gas of positive ions and negative electrons?
A Matter changes to a solid state.
B Matter changes to a liquid state.
C Matter changes to a plasma state.
D Matter changes to a gaseous state.

3 Consider a balloon that has a volume V. It contains n moles of gas, it has an internal pressure of P, and its temperature is T. If the balloon is heated to a temperature of 15.5T while it is placed under a high pressure of 15.5P, how does the volume of the balloon change?
A It doubles.
B It stays the same.
C It increases greatly.
D It decreases slightly.

Answers

1) Answer is: B They both dissociate completely, with little or no reverse reactions.

Some of strong acids: HNO₃(nitric acid), HCl(hydrochloric acid), H₂SO₄(sulfuric acid), HI(hydroiodic acid). Strong bases are: sodium hydroxide (NaOH), barium hydroxide (Ba(OH)₂).

For example, hydrochloric acid, completely dissociate in water and give large amount of hydrogen ions (H⁺): HCl(aq) → H⁺(aq) + Cl⁻(aq).

Sodium hydroxide completely dissociate in water:

NaOH(aq) → Na⁺(aq) + OH⁻(aq).

2) Answer is: C Matter changes to a plasma state.

Plasma is a an ionised gas with highly electrical conductivity.

In solid, molecules are closely packed, stiff and do not changes of shape or volume. Solid object (for example iron) does not take on the shape of its container.

Liquids have definite volume, but no fixed shape.

Gases (for example nitrogen and neon) not have definite volume and fixed shape, it depends on its container.

3) Answer is: B It stays the same.

p₁ = P; initial pressure.

p₂ = 15.5 P; final pressure.

V₁ = V: initial volume.

V₂ = ?: final volume.

T₁ = T; initial temperature.

T₂ = 15.5T; final temperature.

The combinated gas law: The volume of a given amount of gas is proportional to the ratio of its Kelvin temperature and its pressure: p₁·V₁/T₁ = p₂·V₂/T₂.

P·V/T = (15.5P · V₂) / 15.5 T.

V₂ = V₁ = V.

Answer:

1). B

2). C

3). B

Explanation:

Answers

Scientists have: (Select all that apply.)
a. observed amino acids forming spontaneously
b. demonstrated how amino acids can form from the environment
c. confirmed that the ultimate source of amino acids and proteins is from plants
d. not yet determined the source of amino acids

The correct answers are:

Demonstrated how amino acids can form from the environment
Confirmed that the ultimate source of amino acids and proteins is from plants

Demonstrated how amino acids can form from the environment and confirmed that the ultimate source of amino acids and proteins is from plants. Hope that was helpful!

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