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2 years ago

Please help!!

1 answer:

8 0

1.B
6.D
D because the mass of one mole (molar mass) of helium gas is 4.002602 g/mol. 4.002602 * 5=20.01309. Rounded equals 20. So, the answer is D.20 g.

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Heat 22.6 g of titanium from 1420oC to 1590oC

Sauron [17]

Answer:

1997.84

Explanation:

(22.6g)(.52J/gC)(170C)

eliminate the respective variables

and you will only have Joules left

multiply it all

u get 1997.84

5 0

3 years ago

Write a balanced half-reaction for the oxidation of gaseous nitric oxide NO to nitrate ion NO−3 in acidic aqueous solution. Be s

crimeas [40]

Answer:

$2H_2O(l)+NO(g)\rightarrow NO_3^-(aq) +4H^+(aq)+3e^-$

Explanation:

Hello there!

In this case, according to the given information, it turns out possible to set up the initial version of the half-reaction as follows:

$NO\rightarrow NO_3^-$

Now, we assign the oxidation numbers to both nitrogen atoms:

$N^{2+}O\rightarrow N^{5+}O_3^-$

It means three electrons are carried, two water molecules are needed on the left side in order to balance the oxygen atoms and consequently four hydronium ions to balance hydrogen atoms in acidic media:

$2H_2O(l)+NO(g)\rightarrow NO_3^-(aq) +4H^+(aq)+3e^-$

Regards!

3 0

2 years ago

Which element is a metalloid out of aluminum, arsenic, carbon, and helium?

Katyanochek1 [597]

Answer:

arsenic

Explanation:helium is a gas and aluminum is a etal and carbon is not a maetalloid

6 0

3 years ago

What is pure chemistry and applied chemistry ?

irga5000 [103]

Pure chemistry refers to pure research - just trying to figure out the properties of existing matter.

Applied chemistry means you are using scientific knowledge of chemistry in order to solve a human problem. For example, chemical medicines are an example of applied chemistry.

7 0

3 years ago

What is the order in which electrons start filling the orbitals?

emmainna [20.7K]

a. 1s 2s 2p 3s 3p 4s 3d 4p is the correct option.

This gives the following order to fill the orbit: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p, (8s, 5g, 6f, 7d, 8p, and 9s)

Aufbau's principle states that electrons fill low-energy atomic orbitals before they fill high-energy atomic orbitals. .. By following this rule, you can predict the electron configuration of an atom or ion.

There may be two electrons at the maximum of one orbit. Since the s subplane has only one orbit, it can hold up to two electrons. The p subplane has three orbitals, so it can hold up to six electrons. The d-subplane has five orbitals, so it can hold up to 10 electrons.

Learn more about electrons here:brainly.com/question/11316046

#SPJ4

4 0

2 years ago