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3 years ago

ACTIVITY 1

1 answer:

7 0

Street: 1. Cars 2. People 3. Wind in the trees 4. Birds 5. Car horn
School: 1. School bell 2. Students laughing 3. Teacher talking 4. Footsteps 5. Lockers
Church: 1. Priest talking 2. People talking 3. Church music 4. Kids crying 5. Benches creaking

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If the unknown elements on the periodic table are "unknown" how did they end up in the periodic table in the first place? *think

mezya [45]

Answer:

The periodic table is a marvel of organization, with each column and each row showing all ... Scientists identified the rest of them in the first half of the 20th century. ... They created in their lab a synthetic, previously unknown element. ... The Berkeley scientists did this for weeks on end, and produced a tiny amount of curium.

Explanation:

8 0

4 years ago

How many grams of aluminum hydroxide are obtained from 13.7 g of aluminum sulfide??

Vladimir [108]

<span>For that we need to know something about the chemistry aluminum sulfide and aluminum hydroxide. Aluminum sulfide will react with water to make insoluble aluminum hydroxide and hydrogen sulfide gas. Therefore, we need a balanced chemical equation.

Al2S3(s) + 6HOH --> 2Al(OH)3(s) + 3H2S(g)
17.7g ........................ ???g

17.7g Al2S3 x (1 mol Al2S3 / 150.3 g Al2S3) x (2 mol Al(OH)3 / 1 mol Al2S3) x (78.0g Al(OH)3 / 1 mol Al(OH)3) = 18.4 g Al(OH)3 ...... to three significant digits.</span>

8 0

3 years ago

Read 2 more answers

2.40 L of a gas is at 721.0 mm Hg pressure. What is its volume at standard pressure?

Anika [276]

Explanation:

723.4 it's 723.4 cuz 2.40+721.0 = 723.4

5 0

3 years ago

An air-to-air heat pump ____ heat from the outside air and deposits it in the conditioned space

givi [52]

According to the research, the correct option is remove. An air-to-air heat pump removes heat from the outside air and deposits it in the conditioned space.

<h3>What are heat pumps?</h3>

It is characterized by being a thermal machine or a device based on thermodynamics that, through an absorption process, takes heat from one place and transfers it to another, that is, it extracts heat from a cold source to a hot one.

An air-to-air heat pump starts by sucking in outside air or recovers heat from outside and transfers it to a higher temperature level in the ambient air, raising the temperature of the room, being adjustable to adapt to the heating needs of the conditioned space.

Therefore, we can conclude that according to the research, the correct option is remove. An air-to-air heat pump removes heat from the outside air and deposits it in the conditioned space..

Learn more about heat pumps here: brainly.com/question/1081420

#SPJ1

8 0

2 years ago

A 3.0 L cointainer contains 4 mol He, 2 mol Ne,and 1 mol Ar. What is the mole fraction of neon gas? What is the partial pressure

CaHeK987 [17]

Answer:

Partial pressure of Ne = 1.43 atm

Explanation:

Step 1: Data given

Volume = 3.0 L

Number of moles He = 4 moles

Number of moles Ne = 2 moles

Number of moles Ar = 1 mol

Total pressure = 5 atm

Step 2: Calculate total moles

Total moles = 4 moles + 2 moles + 1 mol

Total moles = 7 moles

Step 3: Calculate the mol ratio

Mol ratio = moles / total mol

Mol ratio He = 4 moles / 7 moles = 0.571

Mol ratio Ne = 2 moles / 7 moles = 0.286

Mol ratio Ar = 1 mol / 7 moles = 0.143 moles

Ste p4: Calculate partial pressure

PArtial pressure = mol ratio * total pressure

Partial pressure of Ne = mol ratio Ne * total pressure

Partial pressure of Ne = 0.286 * 5 atm

Partial pressure of Ne = 1.43 atm

8 0

3 years ago

Read 2 more answers