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Leya [2.2K]
3 years ago
6

Which of the following pairs of elements belong to the same period?

Chemistry
1 answer:
bagirrra123 [75]3 years ago
3 0

Answer:

He and Ar

Explanation:

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**Plz help with this asap who ever replies first with the right answer will get brainlists
Vesna [10]

Answer:first D. 88L

Second A 2*10^24

Explanation:

At stp 1 mole = 22.4L

mw Cl2= 70.9

280 g =280/70.9 moles, about 4

4*22.4 = about 88

aw Sr 87.6 —> 6.02214076*10^23 atoms = 1 mole

5 0
3 years ago
Explain where you would find the three different types of muscles (cardiac, smooth and skeletal) and how these different types o
yawa3891 [41]

Explanation: Skeletal muscle, attached to bones, is responsible for skeletal movements. The peripheral portion of the central nervous system (CNS) controls the skeletal muscles. Thus, these muscles are under conscious, or voluntary, control. The basic unit is the muscle fiber with many nuclei. These muscle fibers are striated (having transverse streaks) and each acts independently of neighboring muscle fibers.

4 0
2 years ago
What mass of barium carbonate can be produced when 100.0 mL of a 0.100 M solution of barium chloride is mixed with 100.0 mL of a
valentinak56 [21]
100M solution so did new wells alanna annan carbonated
3 0
2 years ago
Two Balloons one filled with hydrogen gas and second filled with neon gas. what gas should be used in an experiement to identify
dalvyx [7]

Answer:

Oxygen

Explanation:

If two balloons are filled with hydrogen gas and helium gas respectively, then we want to identify what gas is in each balloon, we have to do so by exposing the both balloons to flame in an oxygen atmosphere.

Hydrogen combines with oxygen in the presence of a flame with quite a loud sound and the flame is sustained but when a flame is brought near helium gas in a balloon, the gas will only make a little sound when exposed to the flame and extinguish the flame.

The reason for the explosion of the gas in the hydrogen balloon is that combustion of hydrogen gas is exothermic. The heating up of surrounding air molecules leads to a sudden explosion.

However, the helium balloon makes a little sound when the balloon is ruptured releasing helium gas which extinguishes the flame.

8 0
3 years ago
What is the defination of epsom salt?
prisoha [69]
Crystals of hydrated magnesium sulfate used as a purgative or for other medicinal use


It on googIe
Hope that helps
7 0
3 years ago
Read 2 more answers
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