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3 years ago

Help fast! i rlly need help pls :(

Chemistry

2 answers:

mars1129 [50]3 years ago

7 0

Does it give you opinions if you click the arrow?

myrzilka [38]3 years ago

5 0

Answer:

Show the choices

Explanation:

show it

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Select all the correct answers.

pochemuha

<u>Out of all given option, the following statements are true about a system:</u>

A system is a group of objects analyzed as one unit.
Energy that moves across system boundaries is conserved

Answer: Option A and B

<u>Explanation:</u>

A system is "a complicated item whose parts or segments are identified with probably a portion of different segments", it very well may be material or calculated. All systems have piece, structure, and condition, yet just material systems have instruments (or forms), and just some material systems have shape.

As per systems, all articles are systems or segments of another system. For instance, a nuclear core is a physical material system made out of protons and neutrons related by solid atomic association; a cell is a natural material system made out of related organelles by non-covalent synthetic securities and metabolic pathways; and a logical hypothesis is a consistent reasonable system made out of theories, definitions, and hypotheses related by relationship and conclusion.

8 0

3 years ago

Oxygen gas is collected over water. The atmospheric pressure is 748 mmHg, and the temperature of the oxygen is 29 ºC. The pressu

KonstantinChe [14]

The pressure of the oxygen gas collected : 718 mmHg

<h3>Further explanation</h3>

Given

P tot = 748 mmHg

P water vapour = 30 mmHg

Required

P Oxygen

Solution

Dalton's law of partial pressures states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases

Can be formulated:

P tot = P1 + P2 + P3 ....

The partial pressure is the pressure of each gas in a mixture

P tot = P H₂O + P Oxygen

P Oxygen = 748 mmHg - 30 mmHg

P Oxygen = 718 mmHg

6 0

3 years ago

Find the volume of 3.011x1023 molecules of O2 at STP.

lord [1]

Answer:

6.022 x 1023 molecules = 1 Mole O2 = 22.4L

3.022 x 1023 molecules = 1/2 Mole O2 = 11.2L

The answer is 11.2 Litres

Explanation:

8 0

2 years ago

A lab director asks two students, Lydia and Damien, to each select a bottle of a concentrated weak base. When they reach the cab

algol13

Lydia and Damien should select the bottle of weak base with high molarity(M)

<h3>Further explanation</h3>

According to Arrhenius, Base is a compound which in water releases OH- ions

Electrolytes (acids or bases) with a small degree of ionization are classified as weak electrolytes

If two students, Lydia and Damien, select each bottle of a concentrated weak base, then a guide can be chosen to choose some of the solutions available in the lab :

Base compounds are usually known from their names ending in hydroxide suffixes such as NaOH, sodium hydroxide

The weak base will be partially ionized in water because the ionization degree is close to 0 or less than 1

If there is a Kb value (base ionization constant), then this shows the strength of the base. The greater the value of Kb, the greater the base strength