3 years ago

Because of metallic bonding, when light is pointed at metals, they become

Chemistry

1 answer:

Papessa [141]3 years ago

4 0

Metals become shiny when light is pointed at them.

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An atom has atomic number 5 and mass number 11. How many protons does the atom have? 5 6 10 11

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Answer:

6 neutrons. The mass number is the number of protons and neutrons in the nucleus of an atom. The atomic number shows how many protons. Subract the atomic number from the mass number to find the number of neutrons.

Explanation:

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4 years ago

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castortr0y [4]

Molarity = moles / liter

a) M = 2/4 = 0.5 M

b) Moles = 4/(30 + 16 + 1)
= 0.085
M = 0.085 / 2 = 0.0425 M

c) Moles = 5.85 / (23 + 35.5)
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M = 0.1 / 0.4
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3 years ago

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Is it true that Organisms need water, vitamins and minerals. But they do not need salt to function.

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All organisms need water, vitamins, minerals, and salt together to balance things out.

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3 years ago

The decomposition of NI3 to form N2 and I2 releases −290.0 kJ of energy. The reaction can be represented as 2NI3(s)→N2(g)+3I2(g)

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Answer:

-7.34 kilo Joules is the change in enthaply when 20.0 grams of nitrogen triiodide decomposes.

Explanation:

Mass of nitrogen triiodide = 20.0 g

Moles of nitrogen triiodide = $\frac{20.0 g}{395 g/mol}=0.05063 mol$

$2NI_3(s)\rightarrow N_2(g)+3I_2(g), \Delta H_{rxn}=-290.0 kJ$

According to reaction, 2 moles of nitrogen triiodide gives 290.0 kilo Joules of heat on decomposition ,then 0.05063 moles of nitrogen triiodide will give :

$\frac{-290.0 kJ}{2}\times 0.05063=-7.34 kJ$

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3 years ago

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