What structural units make up network solids

Consider a bathtub holding a system of water (where the boundaries of the tub are the boundaries of the system) under the follow

Luba_88 [7]

Answer:

a) the system is closed

b) the system is open

Explanation:

a) the system can be characterised as closed system. If we define the boundaries of this system as an envelope that contains the bathtub, then there will not be any mass transfer to the environment through the boundary → then the system is closed ( the mass of the system remains constant)

b) on the other hand , taking the same system as in the first case, if the hot water is continually added to the tub , then there is water flow through the boundary (from the environment to the system) → then the system is open ( the mass of the system can be altered)

4 0

3 years ago

99 POINTS Which volcanoes are the tallest Shield, Cinder Cones or Composite Cones?

charle [14.2K]

Shield volcanos are the tallest. The tallest one is Mauna Loa in Hawaii

6 0

4 years ago

Read 2 more answers

4. Calculation of theoretical yield and percent yield You balanced this reaction earlier: Mg(s) + HCl (aq) H2 (g) + MgCl2 (aq) Y

erik [133]

Answer:

Mg(s) + 2 HCl (aq) → H₂(g) + MgCl₂

0.415g of H₂(g) -Assuming mass of Mg(s) = 10.0g-

Explanation:

Balancing the reaction:

Mg(s) + HCl (aq) → H₂(g) + MgCl₂

There are in products two atoms of H and Cl, the balancing equation is:

Mg(s) + 2 HCl (aq) → H₂(g) + MgCl₂

Assuming you add 10g of Mg(s) -Limiting reactant-

10g of Mg are (Atomic mass: 24.305g/mol):

10g × (1 mol / 24.305g) = 0.411 moles of Mg

-Theoretical yield is the amount of product you would have after a chemical reaction occurs completely-

Assuming theoretical yield, as 1 mole of Mg(s) produce 1 mole of H₂(g), theoretical yield of H₂(g) is 0.411moles H₂(g). In grams:

0.411mol H₂(g) × (1.01g / mol) = 0.415g of H₂(g)

3 0

3 years ago

A container is filled with a mixture of helium, Xenon, and neon gases. The total pressure inside the container is 1,788 mmHg. If

dmitriy555 [2]

Answer: The partial pressure of Xenon in a container filled with a mixture of helium, Xenon, and neon gases and a total pressure inside the container is 1,788 mmHg with the pressure of the helium gas as 760 mmHg, the pressure of the neon gas as 200 mmHg is 828 mmHg

Explanation:

NOTE :

Dalton's law of partial pressures states that in a mixture of gases the pressure exerted by each gas is the same as that which it would exert if it alone occupied the container.

How to determine the partial pressure

Total pressure = Partial pressure of Neon + Partial pressure of Xenon + Partial pressure of helium

Partial pressure of Xenon = ? mmHg

Partial pressure of Helium = 760 mmHg

Partial pressure of Neon = 200 mmHg

Total pressure of gases = 1, 788 mmHg

Partial pressure of Xenon = Total pressure - Partial pressure of Helium - Partial pressure of Neon

Partial pressure of Xenon = 1, 788 - 760 -200

Partial pressure of Xenon = 1,788 - 960

= 828 mmHg

Thus, the partial pressure of Xenon is 828 mmHg

6 0

2 years ago

Select the correct answer. How does a catalyst increase the speed of a reaction?

Nat2105 [25]

Answer:

A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process. Catalysts typically speed up a reaction by reducing the activation energy or changing the reaction mechanism.

Explanation:

5 0

3 years ago