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3 years ago

HELP HELP ME PLEASE!!!!!!!

Chemistry

1 answer:

Zielflug [23.3K]3 years ago

5 0

11. Ionic compounds that dissolve in water conduct electricity because they break into ions that move freely.

12. Solid metals are good conductors of heat and electricity.

13. Molecular compounds that dissolve in water do not conduct electricity because no charged particles are present.

14. Because the electrons in a molecule of hydrogen fluoride (HF) are more strongly pulled toward the fluorine atom, the molecule is polar.

15. A metal crystal consists of positively charged metal ions embedded in a "sea" of freely moving valence electrons.

16. The properties of solid metals can be explained by the structure of and the bonding among the metal atoms. = True

17. Orderly crystal shapes, high melting points, and electrical conductivity, when dissolved in water, are properties of ionic compounds. = True

18. When electrons are transferred between two atoms, a covalent bond is formed. = False (When electrons are shared between two atoms, a covalent bond is formed.)

19. A low melting point is one property of molecular compounds. = True

20. A nonpolar bond is formed when two atoms share electrons unequally. = False (a polar bond is formed)

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Click on the Delta H changes sign whan a process is reversed button within the activity and analyze the relationship between the

andreev551 [17]

Answer:

ΔH = 1270kJ

Explanation:

Let's consider the following thermochemical equation.

B(s) + 3/2 O₂(g) → B₂O₃(s), ΔH = −1270kJ

Since ΔH < 0, this reaction is exothermic. According to the Lavoisier-Laplace law, if we reverse a reaction, its enthalpy will have the same value and opposite sign than the direct reaction.

B₂O₃(s) → B(s) + 3/2 O₂(g), ΔH = 1270kJ

For the inverse reaction, ΔH > 0, which means that it is endothermic.

6 0

4 years ago

The equilibrium constant is equal to 5.00 at 1300 K for the reaction:2 SO2(g) + O2(g) ⇌ 2 SO3(g). If initial concentrations are

oee [108]

This is an incomplete question, here is a complete question.

The equilibrium constant is equal to 5.00 at 1300 K for the reaction:

$2SO_2(g)+O_2(g)\rightarrow 2SO_3(g)$

If initial concentrations are [SO₂] = 1.20 M, [O₂] = 0.45 M, and [SO₃] = 1.80 M, the system is

A) at equilibrium.

B) not at equilibrium and will remain in an unequilibrated state.

C) not at equilibrium and will shift to the left to achieve an equilibrium state.

D) not at equilibrium and will shift to the right to achieve an equilibrium state.

Answer : The correct option is, (A) at equilibrium.

Explanation :

Reaction quotient (Q) : It is defined as the measurement of the relative amounts of products and reactants present during a reaction at a particular time.

The given balanced chemical reaction is,

$2SO_2(g)+O_2(g)\rightarrow 2SO_3(g)$

The expression for reaction quotient will be :

$Q=\frac{[SO_3]^2}{[SO_2]^2[O_2]}$

In this expression, only gaseous or aqueous states are includes and pure liquid or solid states are omitted.

Now put all the given values in this expression, we get

$Q=\frac{(1.80)^2}{(1.20)^2\times (0.45)}=5.0$

The given equilibrium constant value is, $K_c=5.00$

Equilibrium constant : It is defined as the equilibrium constant. It is defined as the ratio of concentration of products to the concentration of reactants.

There are 3 conditions:

When $Q>K_c$ that means product > reactant. So, the reaction is reactant favored.

When $Q$ that means reactant > product. So, the reaction is product favored.

When $Q=K_c$ that means product = reactant. So, the reaction is in equilibrium.

From the above we conclude that, the $Q=K_c$ that means product = reactant. So, the reaction is in equilibrium.

Hence, the correct option is, (A) at equilibrium.

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3 years ago

Calculate the number of miles in 39 g silicon

Semenov [28]

Well what are all the calculations you have

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3 years ago

What is the phase change that occurs when a soild becomes a liquid

Mademuasel [1]

Fusion or melting is the phase change from solid to liquid.

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4 years ago

The data in the table describes the properties of three substances. Based on the data, identify whether each substance is ionic,

GuDViN [60]

Substance A is ionic because in molten and aqueous solution conduct electricity and dissolves in water. This is because it dissociate in ions and ion conduct electicity and dissolve in polar molecules (water). Ionic bond is very strong (high melting point).
Substance B non polar covalent, because it is not dissolve in polar molecules and has weak intermolecular forces (low melting point).
Substance C is polar covalent because polar molecules have stronger intermolecular forces than non-polar and higher melting points.

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3 years ago