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3 years ago

Buffers resist change in pH in a system when?

Chemistry

2 answers:

lord [1]3 years ago

7 0

The answer is B.

hope it helps. :))))

Sedbober [7]3 years ago

5 0

The answer to this question is <span>b) hydrogen chloride (HCl) is added to the system. This is the only acid/base on the list. Only acids and bases have the potential to directly change pH as they contribute hydronium and hydroxide ions. Glucose, sodium chloride, and sodium bromide do not affect pH in the first place.</span>

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Calcum chloride contains only calcum and chloride What is the fomula for this compound? fou need the Peodie Table for thia quest

mafiozo [28]

Answer:

$CaCl_2$

Explanation:

Calcium is the element of the group 2 and period 4 which means that the valence electronic configuration is $[Ar]4s^2$ .

Chlorine is the element of the group 17 and period 3 which means that the valence electronic configuration is $[Ne]3s^23p^5$ .

Thus, calcium losses 2 electrons to 2 atoms of chlorine and these 2 atoms of chlorine accepts each electron to form ionic bond. This is done in order that the octet of the atoms are complete and they become stable.

Ca Cl

2 1

Cross multiplying the valency, We get, $CaCl_2$

Thus, the formula of calcium chloride is $CaCl_2$ .

3 0

4 years ago

In the compound potassium nitrate (KNO3), the atoms within the nitrate ion are held together with bonding, and the potassium ion

sveta [45]

In the compound potassium nitrate (KNO3), the atoms within the nitrate ion are held together with COVALENT bonding, and the potassium ion and nitrate ion are held together by IONIC bonding.

A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs. Covalent bond is formed between two non-metals.

Ionic bonds form when one atom gives up one or more electrons to another atom. It is the complete transfer of valence electron(s) between oppositely charged atoms. Ionic bond is formed between metal (electropositive element) and non-metal(electronegative element)

In nitrate ions the Nitrogen (N) and Oxygen (O) both are non-metals and it involves the sharing of electron pairs between N and O atoms, so the bonding in Nitrate ( $NO_{3}^{-}$ ) ion is covalent bonding.

In potassium nitrate , Potassium (K) is a metal and Nitrate ( $NO_{3}^{-}$ ) ion is non-metal and it involves the complete transfer of valence electron between oppositely charged atoms (K+) and ( $NO_{3}^{-}$ ). So the bonding between Potassium and Nitrate is Ionic bonding.

NOTE : Bonding between Non-metals is Covalent bonding.

Bonding between Metal and Non-metals is Ionic bonding.

7 0

4 years ago

What environment will produce the largest crystal sizes?

VMariaS [17]

The pressure should be low as low pressure can melt the crystals easier way
According to Gay lussac's law pressure is directly proportional to temperature so temperature should be also low as it's general any thing need to be cooled down inorder to get crystallised
Now for amount of dissolved solids the solution should be super saturated like magma .It denotes that the particles present as solute must be greater than the solubility.
Cooling time also should be long inorder to give time to crystallization

3 0

2 years ago

Name four products of incomplete combustion

aalyn [17]

Answer: The products are carbon monoxide, water and carbon.

Explanation:

5 0

3 years ago

Which is a characteristic of mixtures?

d1i1m1o1n [39]

Answer: They can be separated by physical processes.

Explanation: A mixture is made up of two or more substances that are not chemically combined and can be easily separated into its constituents by physical methods.

8 0

3 years ago