Answer:
A. Bubbles formed
Explanation:
When a student added a piece of limestone to a solution of hydrochloric acid, bubbles are formed.
The bubbles are as a result of the CO2 gas that is formed.
Below is the reaction:
CaCO3+2HCl → CO2+H2O + Ca++ + 2Cl-
From the left hand side, we can see that the reaction is with limestone and hydrochloric acid. Their reaction forms carbon dioxide gas (CO2), water (H2O), dissolved calcium (Ca++) and dissolved chlorine (Cl-) on the right hand side.
With due observation, bubbles will be seen evolving from the reaction. These bubbles formed is the carbon dioxide gas which reveals that a reaction is taking place.
Answer:
Plastics are made from natural materials such as cellulose, coal, natural gas, salt and crude oil through a polymerisation or polycondensation process. Plastics are derived from natural, organic materials such as cellulose, coal, natural gas, salt and, of course, crude oil.
Of the most devastating elements of this pollution is that plastics takes thousands of years to decay. ... As a result, fish and wildlife are becoming intoxicated. Consequently the toxins from the plastics have entered the food chain, threatening human health.
Long term usage and exposure of plastics and plastic products to high temperature can lead to leaching of toxic chemical constituents into food, drinks and water. Indiscriminate disposal of plastics on land and open air burning can lead to the release of toxic chemicals into the air causing public health hazards.
The Marshall Plan was considered a huge success as its financial aid helped to restore infrastructure in Western Europe after World War I.
<h3>What is the Marshall Plan?</h3>
This refers to the American initiative in 1948 to provide aid to Western Europe during the aftermath of WWI.
Hence, we can see that your question is incomplete as it does not include the first part and therefore, a general overview of the Marshall Plan is stated.
Read more about The Marshall Plan here:
brainly.com/question/1373135
#SPJ1
One axis would be seconds 1,2,3,4,5 ect. and the other axis would be feet 15,30,45,60,75 ect.
