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svetlana [45]
3 years ago
7

Which element is a noble gas? A. H B. Ko C. Xx D. Ar E. O

Chemistry
2 answers:
Leni [432]3 years ago
6 0

Answer:

bnklknnjjkjjnnbbbbbbn

oee [108]3 years ago
3 0

Answer:

A. H

H

Explanation:

Hope it helps :)

cggvgg

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Complete the following radioactive decay problem.<br> 238<br> Np →<br> 93<br> 0<br> e +<br> - 1
JulijaS [17]

Answer:

238 94Pu

Explanation:

From the question given, we noticed that the element is undergoing beta minus decay. This means that the daughter nuclei obtained will have the same mass number as the parent element and the the atomic number of the daughter nuclei will increase by 1.

Please see attached photo on how to arrive at the answer.

5 0
3 years ago
1. A sample of aluminum absorbs 50.1 J of heat, upon which the temperature of the sample increases from 20.0°C to 35.5°C. If the
Maurinko [17]

Answer:

Mass of aluminium in sample = 3.591 g ≅ 3.6 grams

Explanation:

Given that,  A sample of aluminum absorbs 50.1 J of heat, upon which the temperature of the sample increases from 20.0°C to 35.5°C.

the specific heat of aluminum is 0.900 J/g- °C

The relation between heat absorbed and change in temperature is given by,   Q = msΔT.

where Q = heat absorbed

            m = mass of the substance

            s = specific heat of substance

          ΔT  = change in temperature

Now, in our case, Q = 50.1 J ; s = 0.900 J/g- °C; ΔT= 35.5-20 = 15.5°C

⇒ m =  \frac{Q}{s(T_{2} -T_{1}) }

⇒ m = \frac{50.1}{0.900(15.5)} = 3.591 g ≅ 3.6 g

⇒ m ≅ 3.6 g

5 0
3 years ago
A 9.75 L container holds a mixture of two gases at 15 ° C. The partial pressures of gas A and gas B, respectively, are 0.415 atm
sasho [114]

nitro gas and regular hope this helped

3 0
3 years ago
The formation of a gaseous product is usually indicated by a/an______________ in a chemical reaction.
Harman [31]

Answer: The formation of a gaseous product is indicated by an UPWARD ARROW in a chemical reaction.

Explanation:

A chemical reaction is defined as the process whereby chemical bonds between atoms of

substances known as reactants are either formed or broken leading to the formation of products. New substances are usually formed during a chemical reaction. The following are features of chemical reaction:

--> Evolution of gas

--> Formation of a precipitate

--> Change in color

--> Change in temperature

--> Change in state and

--> Formation of new substances.

Some chemical reactions takes place with the evolution of gas. This can be seen in the reaction of Zinc metal with hydrochloric acid. Hydrogen gas is EVOLVED with the formation of zinc chloride.

UPWARD ARROW in a chemical reaction indicates the evolution of a gas. It appears only on the product side and is written next to the gaseous product.

7 0
2 years ago
Which of the following would result in being able to dissolve a greater amount of gas in a solution?
Rudik [331]
Being the get-away driver
5 0
3 years ago
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