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malfutka [58]
4 years ago
6

Two substances, A and Z, are to be identified. Substance A can not be broken down by a chemical change. Substance Z can be broke

n down by a chemical change. What can be concluded about these substances?
(1) Both substances are elements.
(2) Both substances are compounds.
(3) Substance A is an element and substance Z is a compound.
(4) Substance A is a compound and substance Z is an element.
Chemistry
2 answers:
Kisachek [45]4 years ago
5 0

Answer;

(3) Substance A is an element and substance Z is a compound.

Explanation;

-A compound is a substance formed when two or more chemical elements are chemically bonded together, such as water, carbon dioxide, methane, etc while an element is a pure chemical substance made of same type of atoms, such includes, oxygen, potassium, hydrogen, carbon, etc.

- Compounds can be broken down or decomposed into simpler substances: elements cannot be broken down chemically into simpler substances .

Nikitich [7]4 years ago
4 0
The answer is (3) Substance A is an element and Z is a compound. The chemical reaction can only break the chemical bond but can not change the atom. So A will is an element. 
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What is pH when 4.0 mL of 2.0 M barium hydroxide is added to 10.0 mL of 1.00 M nitric acid?
Anika [276]

Answer : The pH of the solution will be 13.63.

Solution:

Moles of hydroxide ions in barium hydroxide solution

BaOH_2\rightarrow Ba^++2(OH)^-

Number of moles = (concentration)\times(volume in liters) ...(1)(1L=1000mL)

<em>2.0 M barium hydroxide in solution</em>

Number of moles of Ba(OH)_2 in 2.0 M solution=2.0 M\times 0.004 L=0.008 moles

If One mole of barium hydroxide gives two moles of hydroxide in solution then 0.008 moles will give:

Number of moles of  OH^-=(2)\times (0.008 mol)=0.016 moles

Moles of H^+ ions in nitric acid

HNO_3\rightarrow NO^{-}_{3}+H^+

<em>In 1.00 M nitric acid solution</em>

Moles of nitric acid in 1.0 M solution =(1.0 M)\times(0.010 L)=0.010 moles

If one mole of nitric acid will give one moles of H^+ ion.

Then 0.010 moles of nitric acid in solution will give :

Number of moles of  H^+=(1)\times (0.010 mol)=0.010 moles

Since , the reaction will be neutralization reaction, equal number of moles of H^+ will neutralize equal number of moles of OH^-

So,0.010 moles of H^+ will neutralize 0.010 moles of OH^- in the solution

Remaining moles of OH^-=0.016- 0.01=0.006 moles

Concentration of [OH^-] resulting solution

Resulting volume of the solution : 0.004 + 0.010 liters

Calculating [OH^-] by using equation (1).

[OH^-]=\frac{0.006}{0.004L+0.010 L}=0.4285 M

pOH=-log[OH^-]=-log(0.4285)=0.367

pH=14-pOH=14-0.367=13.633

The pH of the solution will be 13.633.

8 0
4 years ago
Where is the potential energy equal to 0
sasho [114]

Answer:

For example, the lowest height in a problem is usually defined as zero potential energy, or if an object is in space, the farthest point away from the system is often defined as zero potential energy. Then, the potential energy, with respect to zero at →r0, r → 0 , is just U(→r). U ( r → )

Explanation:

8 0
3 years ago
How are acids and bases different?
Andrew [12]

Answer: The main difference between acid and base is that acids act as proton donors whereas base act as proton acceptors. Upon the reaction of acids and bases in solutions, the H + ions are neutralized by OH – ions, and they form water molecules together.

8 0
3 years ago
Which of the following is the best explanation for a covalent bond?
Scrat [10]

Answer:

A. electrons simultaneously attracted by more than one nucleus

Explanation:

  • Covalent bond is the bond which is formed with the sharing of the electrons between the two atoms which are taking part in the bond. It is generally formed between the atoms with similar electronegativity values.
  • It is the bond which is generally occurs within non metals as they share electrons to complete their octet.
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Thus, the electrons are attracted by the two different nucleus of the atoms that are taking part in the bonding.

<u>So, the correct answer is:- A. electrons simultaneously attracted by more than one nucleus</u>

6 0
3 years ago
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GarryVolchara [31]

Answer:

See explanation

Explanation:

The wittig reaction is an organic reaction in which an aldehyde or a ketone reacts with a phosphonium ylide to give an alkene. This phoshonium ylide that participates in the reaction is usually generated insitu in the system by reaction of an alky or aryl triphenylphosphonium halide salt with a base(sodium hydroxide is mostly used).

In this particular reaction 4-methylbenzaldehyde and benzyltriphenylphosphonium chloride were reacted together in the presence of sodium hydroxide and the product with the structure shown in the answer was obtained as the major isomer produced in the reaction.

3 0
4 years ago
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