CHEMISTRY HIGH SCHOOL

Great amounts of atomic energy are released when a _______reaction occurs.

Answers

Answer 1
Answer:

Great amounts of atomic energy are released when a _______reaction occurs.

Great amounts of atomic energy are released when a chemical reaction occurs. The process can be an exothermic reaction or endothermic reaction depending on the substances involved in the reaction.

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The radioisotope radon-222 has half-life of 3.8 days. how much of a 73.9-g sample of radon-222 would be left after approximately 23 days?

Answers

This can be solved by the equation: 

A = Aoe^(-ln2/t)T
where Ao is the initial amount of the substance ( 73.9-g sample of radon-222 ), t is the half-life time (3.8 days) and T is the time elapsed. Plugging in the values in the equation, the substance left is 1.11g. 

An environmental chemist needs a carbonate buffer of pH 10.00. How many grams of Na,Co, must she add to 1.5 L of 0.20 M NaHCO,? K, of HCO, = 4.7 x 10"

Answers

Answer: a

Explanation: it just like simple math but it just adding stuff

Which statement best describes gamma radiation?(1) It has a mass of 1 and a charge of 1.
(2) It has a mass of 0 and a charge of –1.
(3) It has a mass of 0 and a charge of 0.
(4) It has a mass of 4 and a charge of +2.

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The correct answer is option 3. Gamma radiation is a type of electromagnetic radiation which is characterized by having the smallest wavelength resulting to having the most energy in the electromagnetic spectrum. Gamma radiation has no mass and no charge.

The atomic mass of an element is calculated using the(1) atomic number and the ratios of its naturally occurring isotopes(2) atomic number and the half-lives of each of its isotopes(3) masses and the ratios of its naturally occurring isotopes(4) masses and the half-lives of each of its isotopes

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The atomic mass of an element is calculated using its masses and the ratios of its naturally occurring isotopes. The answer is number 3.  The rest of the choices do not answer the question above.

Answer:

#3

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According to one acid-base theory, a water molecule acts as a base when it accepts(1) an H+ ion (3) a neutron
(2) an OH- ion (4) an electron

Answers

Answer : The correct option is, (1) an H^+ ion

Explanation :

According to the Bronsted-Lowry or acid-base concept, a substance is called as an acid if it can donate a proton and a substance is called as a base if it can accept a proton. And the substance may be a molecule or an ion.

When a water molecule acts as an acid then it can donate a proton or H^+ ion.

When a water molecule acts as a base then it can accepts a proton or H^+ ion.

Hence, the correct option is, (1) an H^+ ion

Final answer:

In accordance to the Brønsted-Lowry theory, a water molecule acts as a base when it accepts an H+ ion during the ionization of water. This capability for water to function both as an acid when donating an H+ ion, and a base when accepting an H+ ion makes it amphoteric.

Explanation:

According to the Brønsted-Lowry theory of acids and bases in Chemistry, a water molecule acts as a base when it accepts an H+ ion. This occurs during the ionization of water, a chemical reaction that takes place when water auto-ionizes into a hydronium ion (H3O+) and a hydroxide ion (OH-). Therefore, the correct choice from your options is (1) an H+ ion.

Water acts as an acid when it donates an H+ ion and as a base when it accepts an H+ ion, transforming it into a hydronium ion. This capacity for water to act as both an acid and a base makes it amphoteric.

Learn more about Brønsted-Lowry theory here:

brainly.com/question/27901530

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Think about visiting the beach on a hot day. Predict whether sand or water has a higher specific heat and explain your prediction.

Answers

Answer:

The sand has a higher specific heat

Explanation:

The answer is that the sand would have a higher specific heat than water because water requires a lot of heat to raise its temperature while sand needs less heat to change it as water has a high heat capacity that allows it to maintain its temperature within a range.
water has a higher SHC as it would be cooler than the sand meaning it requires more energy to reach the same temperature 
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