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 1

Answer:

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

Answer 2

Answer:

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:

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Which isotope is used to date ancient artifacts such as fossils

Answers

Answer: Carbon-14 isotope is used to date ancient artifacts such as fossils.

Explanation:

To determine the age of ancient artifacts such as fossils, we use radiocarbon dating process.

In this process, a naturally occurring radioisotope of carbon which is Carbon-14 is used. This isotope is generally used because this isotope gets constantly created in the atmosphere with the interaction of cosmic rays with the nitrogen present in atmosphere.

Hence, an isotope of carbon which is Carbon-14 is used to determine the age of ancient artifacts such as fossils.

dating:
this dating is called CARBON 14 DATING...because Carbon 14 is the isotope used to date fossils...
Also Potassium 40 is also used in some cases....

If 2a=3b and a=6 then b=

Answers

then b is 4

2a=3b since a=6

2x6=3b

12=3b

b=12/3

b=4

Answer:

b=4

Explanation:

2a=3b

2a=2*6

2*6=12

2a=12

12=3b

12/3=4

b=4

How are elliptical galaxies different from spiral galaxies?a. They contain older stars and less gas and dust.
b. They contain younger stars and more gas and dust.
c. They are bigger than spiral galaxies.
d. They are smaller than spiral galaxies.

Answers

Answer:

A. They contain older stars and less gas and dust.

Explanation:

There are three types of galaxies:

elliptical galaxies
spiral galaxies
lenticular galaxies

Elliptical galaxies are galaxies shaped like an ellipse, while spiral galaxies consist of a flat, rotating disk that contains stars, gas, and dust, and a central concentration of stars called the bulge.

The difference between elliptical and spiral galaxies is in the amount of gas and dust they contain. Spiral galaxies contain large amounts of gas and dust, which means that new stars are born very often. This makes them brighter than relatively dim elliptical galaxies, which contain less gas and dust. This is why fewer new and brighter stars are born in elliptical galaxies, leaving them with older, dimmer stars.

Is Ba(NO3)2 covalent or ionic

Answers

It is ionic..........

Answer:

Barium Nitrate ( Ba(NO3)2 ) is an Ionic bond.

Explanation:

Ionic bonding is a type of chemical bond that involves the electrostatic attraction between oppositely charged ions, and is the primary interaction occurring in ionic compounds.

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Bases in solution produce what type of ions?a. sulfide ions
b. chloride ions
c. hydroxide ions
d. hydronium ions

Answers

Bases produce hydroxide ions, while acids produce hydrogen ions.

Bases have a pH of above 7, and are bitter and slippery.

Answer: c. hydroxide ions

Final answer:

Bases in a solution produce hydroxide ions (OH-). This ability to donate a hydroxide ion is what characteristically defines a substance as a base.

Explanation:

When bases dissolve in water, they produce hydroxide ions (OH-). In chemistry, bases are substances that can accept hydrogen ions (H+) or donate a hydroxide ion. For example, when sodium hydroxide (NaOH), a common base, dissolves in water, it dissociates into sodium ions (Na+) and hydroxide ions (OH-). This is the characteristic that defines a substance as a base.

Bases in a solution produce hydroxide ions (OH-). This ability to donate a hydroxide ion is what characteristically defines a substance as a base