Two substances have different physical and chemical properties. Both substances havemolecules that contain two carbon atoms, one oxygen atom, and six hydrogen atoms. These two substances must be
(1) isomers of each other
(2) isotopes of each other
(3) the same compound
(4) the same hydrocarbon

Answers

Answer 1

Answer:

Answer: Option (1) is the correct answer.

Explanation:

When two or more compounds represents same chemical formula but different arrangement of atoms in their structure are known as isomers.

Also, due to different arrangement of atoms the molecules will show different physical and chemical properties.

Isotopes are the atoms which contain same number of protons but they have different number of neutrons. So,they exhibit same chemical properties due to same number of electrons or protons.

Thus,we can conclude that in the given situation the two substances must be isomers of each other.

Answer 2

Answer: The answer is (1) isomers of each other. The question part is the definition of isomers. The isotopes are elements with same protons but different neutrons. Isotopes are same element.

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How many moles of oxygen are formed when 58.6 g of KNO3 decomposes according to the following reaction? The molar mass of KNO3 is 101.11 g/mol.4 KNO3(s) → 2 K2O(s) + 2 N2(g) + 5 O2(g)

2.0 cm + 2.6 cm + 4.2 mm =

Please show work

Answers

Hi ;)!
So:
4.2 mm (/10) = 0.42 cm

2.0 cm + 2.6 cm + 0.42 cm = 5.02 cm ;)

Gas produced from a reaction is a phase change and not a chemical change. a. True
b. False

Answers

Answer: The given statement is false.

Explanation:

A chemical reaction is a reaction which brings change in chemical composition of reactants resulting in formation of new compounds which have different chemical properties.

For example, $Zn + H_(2)SO_(4) \rightarrow ZnSO_(4) + H_(2)$

So, when gas is produced in a chemical reaction then it means new compounds are formed due to breakage of old bonds and formation of new bonds.

Thus, we can conclude that the given statement gas produced from a reaction is a phase change and not a chemical change, is false.

False I believe.
Hope I've done my duty!

What is the approximate pH at the equivalence point of a weak acid-strong base titration if 25 mL of aqueous formic acid requires 29.80 mL of 0.3567 MNaOH? Ka = 1.8×10−4 for formic acid.

Answers

Explanation:

Below is an attachment containing the solution

Answer:

pH= 0.369

Explanation:

The formic acid reacts with NaOH as

HCOOH + NaOH= HCOONa + H2O

Apply CaVa/ CbVb = Na/Nb

Ca×25/(29.8×0.3587) = 1/1

Ca= (29.8×0.3587)/25= 0.428M

pH = - log(H+)

Since only 0ne H+ is in the stoichiometric equation, it means H+ = 0.428M

pH = -log(0.428) =0.369

When a chemical reaction occurs, the physical and chemical properties of the reactants are the same as the properties of the products.True or False??

Answers

This statement would be false.

They would not be the same

The temperature at which a substance boils is an example of a physical property.a. True
b. False

Answers

A physicalproperty is any property that does not concern with the change of the substance.The changes in the physical property can be used to describe itstransformations or evolutions from its initial state. They are often referredto as observables. Temperature at which asubstance boils is an example of a physical property. The temperature at which a substance boils describes astate of a physical system. It describes the transformation of a liquid fromits liquid state to its vapor by increasing its temperature.

The answer would be (a.)True.

Which is an example of a chemical change?mixing of poster colors
formation of clouds
metal corroding in salt water
sugar dissolving in water
separating salt from seawater