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In-s [12.5K]
4 years ago
9

Saftey goggles are worn in the lab- ​

Chemistry
1 answer:
Harrizon [31]4 years ago
4 0

Answer:

Yes

Explanation:

Is this a question or what?

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use the periodic table to determine the molar mass of each of the following elements. Use the correct number of significant figu
Yanka [14]

Answer: Potassium is 39.10 g/mol

Explanation: The numbers below the element are the molar mass.

3 0
3 years ago
Read 2 more answers
How much energy is required when a 142.1 gram sample of aluminum goes from 25.5°C to 46°C? (the specific heat of aluminum is 0.9
vfiekz [6]

Answer:

2621.75 j heat is required to increase the temperature 25.5°C to 46°C.

Explanation:

Given data:

Mass of sample = 142.1 g

Initial temperature = 25.5°C

Final temperature = 46°C

Specific heat capacity of Al = 0.90 J/g.°C

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 46°C - 25.5°C

ΔT = 20.5°C

Q = 142.1 × 0.90 J/g.°C × 20.5°C

Q = 2621.75 j

Thus,  2621.75 j heat is required to increase the temperature 25.5°C to 46°C.

4 0
3 years ago
Based upon the intermolecular forces present, rank the following substances according to the expected boiling point for the subs
Trava [24]

Answer: NaCl>HCl&H2O> N2

Explanation:

NaCl, as an ionic substance has a very high boiling point as expected. However, the boiling points of HCl and H2O depend on the relative concentration of the HCl and water, at 20% HCl, it boils at almost the same temperature as water due to extensive intermolecular hydrogen bonding. N2 comprises only of Vanderwaals forces hence it has the least boiling point.

8 0
4 years ago
What are the three main parts of an atom and what are their charges?
Leviafan [203]

Answer:

Three main parts are Protons (pos charge) Neutrons (no charge) Electrons (negative charge) and the electron is found on the outside of the nucleus

Explanation:

8 0
3 years ago
How much oxygen be required to produce 3.9 mol of water
timofeeve [1]

Answer:

1.95mol

Explanation:

First let us generate the equation for the reaction:

2H2 + O2 —> 2H2O

From the equation,

1mole of O2 reacted to produce 2moles of H2O.

Therefore, Xmol of O2 will react to produce 3.9 mol of H2O i.e

Xmol of O2 = 3.9/2 = 1.95mol

6 0
3 years ago
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