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4 years ago

Which definition describes a half-life

Chemistry

2 answers:

Nataliya [291]4 years ago

7 0

For example, the half-life of a radioactive substance is the amount of time it takes for half of its atoms

Fynjy0 [20]4 years ago

5 0

Answer: Half life is the time in which a substance remains halve of its original amount. Mostly we use the term half life for radioactive substances.

For example:- Half life of carbon-14 is 5730 years. So, if we take 100 grams of carbon-14 then it will remain 50 grams in 5730 years. In next 5730 years, it will remain 25 grams.

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Which element is less electronegative than barium

mario62 [17]

Francium is less electronegative than barium

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4 years ago

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What type of bond forms between two oxygen atoms

mr_godi [17]

Answer:A double convalescent bond is where two pairs of electrons are shared between the atoms rather than just one pair. Two oxygen atoms can both achieve stable structures by sharing two pairs of electrons as in the diagram.

Explanation:

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3 years ago

Name one alternative pathway to glycolysis: _______________________

NemiM [27]

solution:

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4 years ago

Josh heated a certain amount of blue copper sulfate crystals to get 2.1 g of white copper sulfate powder and 1.4 g of water. Wha

kolbaska11 [484]

Answer: The mass of blue copper sulfate is 3.5 g

Explanation:

Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.

This also means that total mass on the reactant side must be equal to the total mass on the product side.

The chemical equation for the heating of copper sulfate crystals is:

Let the mass of blue copper sulfate be 'x' grams

We are given:

Mass of copper sulfate powder = 2.1 grams

Mass of water = 1.4 grams

Total mass on reactant side = x

Total mass on product side = (2.1 + 1.4) g

So, by applying law of conservation of mass, we get:

Hence, the mass of blue copper sulfate is 3.5 grams

7 0

3 years ago

How many moles are in 2.10 grams of KCr(SO4)2 • 12H2O

mart [117]

Answer:

42996.19989

Explanation:

Molar mass of KCr(SO4)2 12h2o is 20474.3809 g/mol x 2.1 = 42996.19989

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4 years ago