How would you describe the particles that make up a liquid? are the shape and volume of liquids definite or indefinite?

Answers

Answer 1

Answer: Particles in a liquid move freely and liquids have a definite volume and indefinite shape since it occupies the shape of the container in which the liquid is in.

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The components in a mixture do not combine chemically true or false?

Answers

True
A mixture is a combination of two or more substances in any proportions. The substances in a mixture do not combine chemically, so they retain their physical properties

Assume that 13.5 g solid aluminum (Al) react with HCl to produce solid aluminum chloride (AlCl3) salt and gaseous hydrogen (H2) at standard temperature and pressure.How many moles of Al react?

How many moles of H2 are produced?

How many liters of H2 are produced?

Answers

0.5 moles $\bold {Al}$ is required for the given reaction to occur. Mole is a constant that represents a certain amount of particles such as atoms, ions, or molecules.

What is the Mole concept?

It is the number or constant that represents a certain amount of particles such as atoms, ions, or molecules.

1 mole = $6.02 * 10^2^3$ particles.

$n = \frac wm$

Where,

$n$ - number of moles

$w$ - given mass = 13.5 g.

$m$ - molar mass = 26.98 g/mol.

Put the values in the formula,

$n = \frac {13.5} {26.98}\n\nn = 0.5\rm \ mol.$

Therefore, 0.5 moles $\bold {Al}$ is required for the given reaction to occur.

Learn more about Mole concept:

brainly.com/question/7287712

Answer:

1) 0.5 mol.

2) 0.75 mol.

3) 16.8 L.

Explanation:

1) How many moles of Al react?

We can calculate the number of moles of Al (n) using the relation:

n = mass / molar mass,

Mass of Al = 13.5 g.

Molar mass mass of Al = 26.98 g/mol.

∴ The number of moles of Al (n) = mass / molar mass = (13.5 g) / (26.98 g/mol) = 0.5 mol.

2) How many moles of H₂ are produced?

It is a stichiometry problem.

We should write the balanced equation of the reaction:

2Al + 6HCl → 2AlCl₃ + 3H₂.

It is clear that 2.0 moles of Al reacts with 6.0 moles of HCl to produce 2.0 moles of AlCl₃ and 3.0 moles of H₂.

Using the cross multiplication:

2.0 moles of Al → 3.0 moles of H₂, from the stichiometry,

0.5 mole of Al → ??? moles of H₂.

∴ The number of moles of H₂ are produced = (0.5 mole)(3.0 mole) / (2.0 mole) = 0.75 mol.

3) How many liters of H₂ are produced?

It is known that at STP, 1.0 mole of any gas occupies a volume of 22.4 L.

Using cross multiplication:

1.0 mole occupies → 22.4 L.

0.75 mole occupies → ??? L.

∴The number of liters of H₂ are produced = (0.75 mole)(22.4 L) / (1.0 mole) = 16.8 L.

Ventifacts are created by a process of erosion called A. deflation. B. flow. C. abrasion. D. creep.

Answers

Ventifacts are created by a process of erosion called.
(D.)Abrasion

C. abrasion (by windblown particles)

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:

Which base is the strongest for the given [H+]? 10-9 10-11 10-10 10-12

Answers

Answer:The strongest base with $H^+]$ concentration is $[H^+]=10^(-12) M$ .

Explanation:

$pH=-\log[H^+]$

Higher the pH value less will be the concentration of $[H^+]$ ion concentration and stronger will be the base.

1. $[H^+]=10^(-9) M$

$pH=-\log[10^(-9)]=9$

2. $[H^+]=10^(-11) M$

$pH=-\log[10^(-11)]=11$

3. $[H^+]=10^(-10) M$

$pH=-\log[10^(-10)]=10$

4. $[H^+]=10^(-12) M$

$pH=-\log[10^(-12)]=12$

The strongest base with $H^+$ concentration is $[H^+]=10^(-12) M$ .

The answer is 10-12. The relationship of pH and [H+] is pH = -lg[H+]. And the higher pH, the stronger base is. So the strongest base has the lowest concentration of H+.

In this equation, what should be the coefficients of the reactants and products?I2 + O2 ---> I4 O9

Answers

4 I₂+ 9 O₂ = 2 I₄O₉

Reactants :

I₂ , O₂

Products :

I₄O₉

hope this helps!

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