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natulia [17]
3 years ago
8

How many calories are required to raise the temperature of 75g of water from 20 ˚C to 50˚ C?

Chemistry
1 answer:
mojhsa [17]3 years ago
7 0
The answer to the question is letter b
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Which pair of nuclei can undergo a fusion reaction?
AVprozaik [17]
The correct answer is B. Fusion only happens between small atoms. Thus, hydrogen-2 and hydrogen-3 can undergo fusion. Fusion reaction happens when two or more nuclei combine or collide to form an element with a higher atomic number. In this process, some of the matter of the fusing nuclei is converted to energy.
3 0
3 years ago
What mass of precipitate will be produced from the reaction of 50.0 mL of 2.50 mol/L sodium hydroxide with an excess of zinc chl
amid [387]

2NaOH + ZnCl2 → 2NaCl + Zn(OH)2

Zn(OH)2 is your precipitate.

No. of moles of NaOH = 2.50X50.0÷1000 = 0.125mol

2mol of NaOH reacted to produce 1 mol of Zn(OH)2.

No. of moles of Zn(OH)2 produced when 0.125mol of NaOH reacted

= 0.125 x 1 ÷ 2

= 0.0625mol

Mass of Zn(OH)2 = 0.0625 x [65.4+2(16+1)] = 6.21g

5 0
3 years ago
What is the molarity of a solution made by dissolving 5.5 g of KI in enough water to make 150 ml of solution?
Alexandra [31]

Answer:

Explanation:

molarity is moles of solute/L solution

5.5 g                         1 moles Kl             1000 mL

_____                   *  __________    *    ________ = 0.22088 M

150 ml of solution     166 grams              1 L

       (39 grams K+ 127 grams I) ^

8 0
3 years ago
Read 2 more answers
The English unit, the rod, is equal to 16.5 ft. What is the length expressed in meters?
MrRissso [65]

Answer:

1 rod, equal to 16.5 ft, is equal to exactly 5.0292 meters.

Explanation:

8 0
3 years ago
Germanium, Astatine, Tellurium, and Arsenic are all _____. metalloids non-metals metals noble gases
zmey [24]

Answer:-

Metalloids

Explanation: -

Metalloids are elements with properties that are somewhat in between those that of metals and non metals. They have generally 4 or 5 electrons in their valence shell for up to the 4th period to be called a metalloid. From the fifth period 6 valence electrons can make an element metalloid.

From the sixth even 7 valence electrons can make an element metalloid

The electronic configuration of Germanium is

2,8,18, 4

So it is a metalloid.

The electronic configuration of tellurium,

2,8,18, 18, 6

So it is a metalloid.

The electronic configuration of Arsenic

2,8,18, 5

So it is a metalloid.

The electronic configuration of astatine

2,8,18, 32, 18, 7

So it is a metalloid.

4 0
3 years ago
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