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3 years ago

Which properties are characteristic of true solutions? (select all that apply.)?

1 answer:

7 0

The properties that are characteristics of a true solutions are;
The particles are suspended indefinitely
A light beam passes through invisibly.
Brownian movement is displayed by the solute.
A true solution is a homogeneous mixture of two or more substances in which substances dissolved in solvent has the particle size less than 1 nm. Particles of a true solution cannot be filtered through filter paper and are not visible to naked eye.

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For each of the environments below: (1) identify your system and surroundings and (2) predict whether it would be endothermic or

SCORPION-xisa [38]

Answer:

A) Wood burning

system : Wood.

surroundings : atmosphere

Enthalpy : Exothermic

B) Water Freezing system

System : Refrigerator

surroundings : water in the refrigerator

enthalpy change : Endothermic

C) Sweat evaporating

System : Human being

surroundings : Air nearby

Enthalpy change : exothermic

D) Chemical Hand-warmer

system : Hand warmer pack

Surroundings : human palms

Enthalpy Change : Exothermic

Explanation:

A) Wood burning

system : Wood

surroundings : atmosphere

Enthalpy : Exothermic

This system give away energy to its surroundings hence its enthalpy change is exothermic

B) Water Freezing system

System : Refrigerator

surroundings : water in the refrigerator

enthalpy change : Endothermic

The system absorbs heat from what is put inside(surroundings ) of it hence this is na endothermic system

C) Sweat evaporating

System : Human being

surroundings : Air nearby

Enthalpy change : exothermic

This is an exothermic reaction ( enthalpy change ) because the system gives out heat to the surrounding

D) Chemical Hand-warmer

system : Hand warmer pack

Surroundings : human palms

Enthalpy Change : Exothermic

There is movement of heat from the system to the surrounding hence it is an exothermic reaction

6 0

3 years ago

Predict the sign of the entropy change,Delta S, for each of the following reactions:The signs are either going to be pos or nega

algol [13]

Answer: a) $Pb^{2+}(aq)+2Cl^-(aq)\rightarrow PbCl_2(s)$ : negative

b) $CaCO_3(s)\rightarrow CaO(s)+CO_2(g)$ : positive

c) $2NH_3(g)\rightarrow N_2(g)+3H_2(g)$ : positive.

d) $P_4(g)+5O_2(g)\rightarrow P_4O_{10}(s)$ : negative

e) $C_4H_8(g)+6O_2(g)\rightarrow 4CO_2(g)+4H_2O(g)$ : positive.

f) $I_2(s)\rightarrow I_2(g)$ : positive.

Explanation:

Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

$\Delta S$ is positive when randomness increases and $\Delta S$ is negative when randomness decreases.

a) $Pb^{2+}(aq)+2Cl^-(aq)\rightarrow PbCl_2(s)$

As ions are moving to solid form , randomness decreases and thus sign of $\Delta S$ is negative.

b) $CaCO_3(s)\rightarrow CaO(s)+CO_2(g)$

As solid is changing to gas, randomness increases and thus sign of $\Delta S$ is positive.

c) $2NH_3(g)\rightarrow N_2(g)+3H_2(g)$

As 2 moles of reactants are converted to 4 moles of products , randomness increases and thus sign of $\Delta S$ is positive.

d) $P_4(g)+5O_2(g)\rightarrow P_4O_{10}(s)$

As gas is changing to solid, randomness decreases and thus sign of $\Delta S$ is negative.

e) $C_4H_8(g)+6O_2(g)\rightarrow 4CO_2(g)+4H_2O(g)$

As 7 moles of reactants are converted to 8 moles of products , randomness increases and thus sign of $\Delta S$ is positive.

f) $I_2(s)\rightarrow I_2(g)$

As solid is changing to gas, randomness increases and thus sign of $\Delta S$ is positive.

6 0

4 years ago

Observe the image of the results. List the properties you see.

natka813 [3]

Answer:

C. three substances i believe

Explanation:

lmk if im wrong (im sorry if i am!!) But its because the first pic, its a solid substance, 2nd pic is a liquid substance and 3rd pic is condensation or like gas.

8 0

4 years ago

Read 2 more answers

Given the following reaction: F2 + 2KBr -> Br2 + 2KF, what is the ratio between potassium bromide and diatomic bromide

ValentinkaMS [17]

Answer:

2:1

Explanation:

The first step in this type of question is ensure yourself that the chemical is balanced. After establishing that, you read off the answer from the stoichiometric coefficients (the numbers in front of the formula) of potassium bromide and bromine and write those as the ratio, the molar ratio to be more specific.

3 0

3 years ago

What mass of magnesium oxide is produced when 60g of magnesium is burnt in air?

True [87]

Answer:

The chemical equation can be written as:

2Mg+O

→2MgO

48 g of Mg reacts with 32 g of O

Thus, 4.8 g of Mg reacts with 3.2 g of O

Now, 32 g of O

forms = 80 g of MgO.

3.2 g of O

produces =

×3.2 = 8 g of MgO.

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3 years ago