What is the average tidal range? __________ ( I think it is just one word )

1 answer:

3 0

It's around two feet, although I'm not sure how you can express that in 1 word. If you use the metric system it's about 0.6 metres.

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What mass of Na2SO4 is needed to make 2.5L of 2.0M solution? (Na=23g; S=32g; O=16g)

zaharov [31]

The molar mass of Na₂SO₄ -
2 x Na - 2 x23 = 46
1 x S - 1 x 32 = 32
4 x O - 4 x 16 = 64
total = 46 + 32 + 64 = 142 g/mol
the molarity of solution - 2.0 M
in 1 L of solution , 2.0 moles
Therefore in 2.5 L - 2 mol/L x 2.5 L = 5 mol
then the mass of Na₂SO₄ required = 142 g/mol x 5 mol = 710 g

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inna [77]

Answer: C.) SO2

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How much heat energy is required to raise the temperature of 5 kilograms of coal from 20c to 220c?

Elenna [48]

1.3 kJ/kg K x 5 kg x 200C = 1300 kJ
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valentinak56 [21]

Answer:

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Zigmanuir [339]

Answer:

Explanation:

Physical changes in cooking include the melting of solids, such as butter, and the boiling of liquids, such as water. Examples of physical changes would be the melting of fats and the boiling of water. Chemical changes involve the production of new substances.

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