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Dvinal [7]
3 years ago
14

Which of the following elements have properties similar to those of strontium (Sr)

Chemistry
2 answers:
dalvyx [7]3 years ago
8 0
D
because they are elements in the same group as strontium
umka2103 [35]3 years ago
4 0

Answer: Option (D) is the correct answer.

Explanation:

It is known that elements which belong to same group show similar chemical properties.

This is because elements which lie in the same group have same number of valence electrons. Hence, they tend to show same type of reactivity which makes them exhibit similar chemical properties.

For example, Be, Mg, Ca and Sr are all group 2 elements. Hence, they tend to show similar chemical properties.

Thus, we can conclude that out of the given options Be, Mg, Ca elements have properties similar to those of strontium (Sr).

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How many moles are in 5.5 x 10-23 molecules of H2O
masha68 [24]

Answer:

0.914moles

Explanation:

The number of moles in a substance can be got by dividing the number of atoms/molecules/particles by Avagadro's constant (6.02 × 10^23).

That is;

number of moles (n) = number of atom (nA) ÷ 6.02 × 10^23

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n = 5.5 x 10^23 ÷ 6.02 × 10^23

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n = 0.914 × 10^0

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6 0
3 years ago
2. How much heat is released when 432g of water cools down from 710C to 180C?
nadya68 [22]
The heat released by the water when it cools down by a temperature difference AT

is Q = mC,AT

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is the specific heat capacity of water

AT = 71°C -18°C = 530

is the decrease of temperature of the water

Plugging the numbers into the equation, we find

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