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nadya68 [22]
3 years ago
13

Which two types of information are found in an element's box in the periodic

Chemistry
2 answers:
storchak [24]3 years ago
6 0

Answer:

Explanation:

mhiujhiujhkuyhygvhg

asambeis [7]3 years ago
4 0

Answer:

The answer is B and D.

Explanation:

prove me wrong

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A pan containing 20.0 grams of water was allowed to cool from a temperature of 95.0 °C. If the amount of heat released is 1,200
34kurt

Answer:

81 °C

Explanation:

This is a calorimetry question so a few things you will need for this. The calorimetry equation q=mcΔT & the specific heat of water (4.2J/g•°C). Other definitions are:

q = heat added/released by a sample

m = mass of sample

c=specific heat of sample

ΔT = change in temperature

from here we can rearrange the equation to state:

q/(mc) = ΔT

1200J/((20.0g)(4.2J/g•°C)) = ΔT

14°C = ΔT

If the starting temperature was 95.0°C and we know that the temperature was cooled by 14°C then the final temperature of the water would be 81.

4 0
2 years ago
Which statement correctly describes an atom of the element helium? (9)
Luden [163]

C. An atom of helium has its valence electrons in its first energy level, it wouldn't and can't satisfy the Octet rule as it only has 2 electrons, but with 2, it has a full shell, as the first energy level can hold only 2 electrons.

8 0
3 years ago
The atomic number of potassium is 19. How many electrons does this element have?
Vinvika [58]

Answer:

Potassium is an element that has 19 electrons

7 0
2 years ago
How many moles of oxygen are in 1 mole of Pb(SO4)2
irakobra [83]
The answer to the question is Eight
4 0
3 years ago
Read 2 more answers
A student burned 0.250 g of magnesium metal in an open crucible.Oxygen from the air combined with the metal forming magnesium ox
Varvara68 [4.7K]

Answer:

0.171 grams of oxygen combined with the metal.

Explanation:

2Mg+O_2\rightarrow 2MgO

Mass of magnesium oxide produced = 0.421 g

Mass of magnesium metal used = 0.250 g

Suppose reaction completely converts the magnesium into magnesium oxide.

Mass of oxygen combined with magnesium = m

0.421 g = 0.250 g + m

m =  0.421 g - 0.250 g = 0.171 g

0.171 grams of oxygen combined with the metal.

5 0
3 years ago
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