3 years ago

Find the formula for calcium and oxygen

1 answer:

8 0

The charge on Calcium is +2. Since, Calcium oxide is a neutral compound, so the charge on Oxygen should be -2. <span>Valency of Oxygen is 2, so a single Oxygen atom can satisfy the need.

Therefore, formula is CaO.</span>

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What are 2 mixtures and explain your answer

liq [111]

Water and orange juice
Or orange juice and sodium chloride

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2 years ago

Calculate the specific heat of a substance when 63j of energy are transferred as heat to an 8.0 g sample to raise it temperature

Flura [38]

The formula for energy or enthalpy is:

E = m Cp (T2 – T1)

where E is energy = 63 J, m is mass = 8 g, Cp is the specific heat, T is temperature

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6 0

3 years ago

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How many moles of water are produced when 3.0 moles of hydrogen gas react with 1.8 moles of oxygen gas?

swat32

Sorry for the late response but for this question, the answer is 3 moles of water.

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3 years ago

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Answer: 2948

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Half life is the amount of time taken by a radioactive material to decay to half of its original value.

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Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant = $1.21\times 10^{-4}years^{-1}$

t = age of sample = ?

a = let initial amount of the reactant = 100

a - x = amount left after decay process = $\frac{70}{100}\times 100=70$

$t=\frac{2.303}{1.21\times 10^{-4}}\log\frac{100}{70}$

$t=2948years$

Thus the fossil is 2948 years old.

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2 years ago

Near the equator, the sun heats the surface strongly, causing warm air to rise steadily. This creates the _________________, an

kenny6666 [7]

Doldrums, low is the correct answer.

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2 years ago