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3 years ago

Water is the only substance that is _____________ as a solid than as a liquid. Thus it is unique in its physical properties.

1 answer:

4 0

Answer: Water is the only substance that is lighter as a solid than as a liquid. Thus, it is unique in its physical properties.

Explanation:

A property that does not bring any change in chemical composition of a substance are known as physical properties.

For example, shape, size, mass, volume, density, etc of a substance are all physical properties.

On the other hand, a property that changes chemical composition of a substance is known as chemical property.

For example, precipitation, reactivity, toxicity etc are chemical property.

In solid state, water has cage like structure due to which there is space present within its molecules. As a result, it becomes lighter in nature.

Hence, water is the only substance that is lighter as a solid than as a liquid. Thus, it is unique in its physical properties.

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Which of the solutions have greatest osmotic pressure 30% sucrose 60% sucrose or 30% magnesium sulfate?

timofeeve [1]

Answer:Osmotic pressure is the minimum amount of pressure a solution must exert in order to prevent from crossing a barrier by osmosis. Solute molecules have difficulty crossing semipermeable membranes, so the more solutes that are in a solution, the higher the osmotic pressure will be. Between 30% sucrose and 60% sucrose, 60% sucrose will have a greater osmotic pressure than 30% because it has a higher percentage of solutes. However, since sucrose has a higher potential to cross semipermeable membranes and is more absorbable than magnesium sulfate, magnesium sulfate would have a higher osmotic pressure than 60% sucrose even though 60% sucrose has higher molecules.

Explanation:

8 0

3 years ago

Consider the reaction between 15.0 mL of a 1.00 M aqueous solution of AgNO3 and 10.0 mL of a 1.00 M aqueous solution of K2CrO4.

Neporo4naja [7]

Answer:

Species present in the solution after complete reaction: $K^+ ,CrO_4^- , Ag_2CrO_4 , K^+ ,NO_3^-$

Explanation:

First balance the chemical equation,

$2AgNO_3 + K_2CrO_4 =Ag_2CrO_4 + 2KNO_3$

calculation of mili moles of each:

$mili mole= volume in ml \times molarity$

mili mole of AgNO3= 15mili mole;

mili mole of K2CrO4=10 mili mole;

From balance equation,

2 mili mole of AgNO3 reacts with 1 mili mole of K2CrO4

hence 1 mili mole of AgNO3 reacts with 0.5 mili mole of K2CrO4

15 mili mole of AgNO3 reacts with 7.5 mili mole of K2CrO4

so only 7.5 milimole will be used in the reaction and 2.5 mili mole left in solution.

species present in the solution after complete reaction:

$K^+ ,CrO_4^- , Ag_2CrO_4 , K^+ ,NO_3^-$

$K_2CrO4 , KNO_3$ are soluble in water so it will dissociate in the solution

7 0

4 years ago

What kind of intermolecular forces act between a sodium cation and an ammonia molecule? Note: If there is more than one type of

Reil [10]

Answer:

Ion-dipole forces

Explanation:

Na⁺ is a cation, that is, an ion with a positive charge.

NH₃ has polar covalent bonds (due to the difference in electronegativity between nitrogen and hydrogen). According to the VESPR theory, it has a trigonal pyramidal shape with a lone pair. As a consequence, it has a net dipole moment and the molecule is polar.

The intermolecular forces between Na⁺ (ion) and NH₃ (dipole) are ion-dipole forces.

7 0

3 years ago

How many protons, neutrons, and electrons are presented in a nitrogen atom?

lina2011 [118]

7 protons, 7 electrons and 7 neutrons

ATOMIC # = # of Protons and Electrons
MASS # - ATOMIC # = # of Neutrons

7 0

3 years ago

Which is the correct equilibrium constant expression for the following reaction? Fe2O3(s) + 3H2(g) --> 2Fe(s) + 3H2O(g) Kc =

svetlana [45]

Answer:

The equilibrium constant Kc = [Fe]²*[H2O]³ / [Fe2O3][H2]³

Explanation:

Step 1: Data given

For the reaction aA + bB ⇆ cC + dD

the equilibrium constant Kc = [C]^c * [D]^d/[B]^b*[A]^a

Step 2: The balanced equation

Fe2O3(s) + 3H2(g) --> 2Fe(s) + 3H2O(g)

Step 3: Calculate the equilibrium constant Kc

Kc = [C]^c * [D]^d/[B]^b*[A]^a

⇒with [C] = [Fe]

⇒ with c = 2

⇒with [D] = [H2O]

⇒with d = 3

⇒with [A] = [Fe2O3]

⇒with a = 1

⇒with [B] = [H2]

⇒with b = 3

Kc = [C]^c * [D]^d/[B]^b*[A]^a

Kc = [Fe]²*[H2O]³ / [Fe2O3][H2]³

The equilibrium constant Kc = [Fe]²*[H2O]³ / [Fe2O3][H2]³

6 0

3 years ago