CHEMISTRY HIGH SCHOOL

Before free oxygen gas became abundant in the oceans and atmosphere, it reacted with a metal and produced what type of formations?a. the ionosphere
b. the ozone layer
c. banded iron formations
d. stromatolites

Answers

Answer 1
Answer: Before free oxygen gas became abundant in the oceans and atmosphere, it reacted with a metal and produced banded iron formations. 
Answer 2
Answer:

Answer;

Banded iron formations

Before free oxygen gas became abundant in the oceans and atmosphere, it reacted with a metal and produced banded iron formations.

Explanation;

  • Cyanobacteria are thought to have introduced oxygen into the early atmosphere. This was important because oxygen played a key role in the evolution of eukaryotic organisms creating an ozone layer to shield life from UV rays.
  • Banded iron layers were formed in sea water as the result of oxygen released by the photosynthetic cyanobacteria.  As the photosynthetic organisms released oxygen, the available iron in the Earth's oceans precipitated out as iron oxides.

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Gas burning in an engine is an example of a chemical change

phase change

physical change

nuclear change

Answers

The answer is the first option. Gas burning in an engine is an example of a chemical change. Chemical change is a change where the substance changes in identity or form new substances after undergoing a process. In this case, the gas reacts with oxygen forming combustion products, commonly carbon dioxide and water.

Which reaction should be used to convert propene into alkyl halide

Answers

Alkyl is a rare compound, and also very confusing.
I'm assuming you meant "propane"...

C3H8  = Propane
CnH2n+1-- X  << Alkyl Halide
X = Cl

Simply set a chemical reaction :


C3H8 → CnH2n+1-- X



Which compound has both ionic and covalent bonding?(1) CaCO3 (3) CH3OH
(2) CH2Cl2 (4) C6H12O6

Answers

The compound that has both ionic and covalent bonding is \boxed{\left( 1 \right){\text{ CaC}}{{\text{O}}_3}}.

Further Explanation:

The attraction between different atoms, molecules and ions is known as a chemical bond. The formation of various types of compounds takes place as a result of these chemical bonds.

An ionic bond is formed as a result of the interaction between a metal and a non-metal. Metals have the tendency to lose electrons while non-metals tend to gain electrons. Due to this, metal atoms form cations by loss of electrons and non-metals become anions with the gain of electrons.

A covalent bond is formed by the mutual sharing of electrons between the bonded atoms. It is also called the molecular bond. Such bonds usually exist between two or more non-metals.

(1) {\text{CaC}}{{\text{O}}_{\text{3}}}  

Its constituents are {\text{C}}{{\text{a}}^(2 + )} and {\text{CO}}_3^(2 - ) ions. The bond between calcium and carbonate ions is an ionic bond. But the bond between the carbon atom and the oxygen atom of carbonate is formed by sharing of electrons so it is a covalent bond. So {\text{CaC}}{{\text{O}}_{\text{3}}} has both ionic and covalent bonding and therefore this option is correct.

(2) {\text{C}}{{\text{H}}_2}{\text{C}}{{\text{l}}_2}  

It has carbon, hydrogen and chlorine atoms. All of them are nonmetals and the bonds formed between nonmetals are covalent bonds. So {\text{C}}{{\text{H}}_2}{\text{C}}{{\text{l}}_2} has only covalent bonds and therefore this option is incorrect.

(3) {\text{C}}{{\text{H}}_3}{\text{OH}}  

It has carbon, hydrogen and oxygen atoms. All of them are nonmetals and the bonds formed between nonmetals are covalent bonds. So {\text{C}}{{\text{H}}_3}{\text{OH}} has only covalent bonds and therefore this option is incorrect.

(4) {{\text{C}}_{\text{6}}}{{\text{H}}_{{\text{12}}}}{{\text{O}}_{\text{6}}}  

It has carbon, hydrogen and oxygen atoms. All of them are nonmetals and the bonds formed between nonmetals are covalent bonds. So {{\text{C}}_{\text{6}}}{{\text{H}}_{{\text{12}}}}{{\text{O}}_{\text{6}}} has only covalent bonds and therefore this option is incorrect.

Learn more:

  1. Identification of ionic bonding: brainly.com/question/1603987
  2. What type of bond exists between phosphorus and chlorine? brainly.com/question/81715

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Ionic and covalent compounds

Keywords: chemical bond, ionic bond, covalent bond, CaCO3, CH2Cl2, C2H12O6, CH3OH, carbon, hydrogen, oxygen.

CaCO3 is the substance that contains both ionic and covalent bonds. Calcium ions (Ca2+) and carbonate ions (CO3-2) make up the salt known as CaCO3. Ionic bonds, which are created when one atom donates electrons to another atom, are what bind the calcium and carbonate ions together.

Three oxygen atoms and one carbon atom, linked together by covalent bonds, make up the carbonate ion. The three oxygen atoms and the carbon atom share electrons to create a covalent connection. Atoms exchange electrons to make covalent connections, whereas atoms give away electrons to produce ionic bonds.

In CaCO3, an ionic connection is created when the calcium atom donates electrons to the carbonate ion. The carbon atom shares electrons at the same moment.

Learn more about  covalent bonding at:

brainly.com/question/19382448

#SPJ6

A helium-filled balloon contains 130 mL of gas at a pressure of 0.97 atm. What volume will the gas occupy at standard pressure?

Answers

Boyle's Law 
 G:  V1= 130 mL   
       P1= 0.97 atm P2= 1 atm (standard pressure)
 
 U: V2=?
 F: V2 = V1 P1/P2
 S: V2 = (130 mL) (0.97 atm) / 1 atm
 Answer : V2 = 126.1 mL volume of the gas occupy @ STP

Which element forms an ionic bond when combined with Cl

Answers

potassium or any other metals.

The ____ contains the highest concentration of ozone.a. troposphere
c. stratosphere
b. mesosphere
d. exosphere

Answers

C. The stratosphere. About 90% of the ozone is in the stratosphere which begins about 8 miles above the Earth's surface.

Answer: Option (c) is the correct answer.

Explanation:

A layer above the troposphere and below the mesosphere is known as stratosphere.

This layer of stratosphere contains about 90% concentration of ozone and there is no occurrence of weather in this layer.

The occurrence of ozone in stratosphere makes it warmer.

Therefore, we can conclude that the stratosphere contains the highest concentration of ozone.
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