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Describe physical and chemical changes that are harmful to us andhow can we prevent by them?
Wiki User
∙ 15y ago
the physical and chemical changesthat are harmful to us are burning of anything in this anew substance may be formed or may not be and it will be harmful because burning is very dangerous the physical and chemical changesthat are harmful to us are burning of anything in this anew substance may be formed or may not be and it will be harmful because burning is very dangerous
Wiki User
∙ 15y ago
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What are the physical and chemical changes of an apple?
If you cut an apple and keep, the colour changes to brown. This is physical change. Apple has iron (in the form of ferrous salts). The colour is due to the formation of harmful ferric compounds and this is a chemical change (conversion of ferrous to ferric).
Which of the changes described in Figure 4 grade 9 science textbook page 30 involve chemical and physical changes?
I'm not an expert in Chemistry but I think the changes involving in this Figure 4 are the steel changing into rust, and harmful gases changing into safer new gases for physical changes. Also, they are the steam from the exhaust condensating into a white cloud, the explosion of the gasoline air mixture producing hot exhaust gases for chemical changes. Hope it helps a lot!
What are some harmful chemical changes in our daily life?
Rusting, Spoiling, burning of gas, and starting an engine
Chemical reaction in a house?
physical- cutting something curling your hair making steam freezing something Chemical- burning a candle toasting toast peroxide on a cut.
Is the hazard of chlorine bleach a chemical or physical property?
Chlorine bleach is a hazardous chemical. The harmful effects of this chemical manifest physically as chemical burns.
Two changes that are harmful?
Physical and chemical changes are harmful to us.
How do you avoid the harmful changes of physical and chemical changes?
Wear a lab coat, gloves and goggles. Also use a fume hood.
What are the physical and chemical changes of an apple?
If you cut an apple and keep, the colour changes to brown. This is physical change. Apple has iron (in the form of ferrous salts). The colour is due to the formation of harmful ferric compounds and this is a chemical change (conversion of ferrous to ferric).
What are the harmful effects of physical changes?
There are many harmful effects of physical change. Some of these things mean that the items no longer fit where the need to.
Which of the changes described in Figure 4 grade 9 science textbook page 30 involve chemical and physical changes?
I'm not an expert in Chemistry but I think the changes involving in this Figure 4 are the steel changing into rust, and harmful gases changing into safer new gases for physical changes. Also, they are the steam from the exhaust condensating into a white cloud, the explosion of the gasoline air mixture producing hot exhaust gases for chemical changes. Hope it helps a lot!
Useful and harmful changes to the environment?
well ,I was looking for an answer for this question at last i got it!! the answer was:there are some physical change that are really harmful example:weight gain,diseases etc....
What are some harmful chemical changes in our daily life?
Rusting, Spoiling, burning of gas, and starting an engine
What is used to describe the amount of a harmful substance on fresh water?
Water quality is the term used to describe the amount of harmful substances in fresh water. Water quality is assessed water measurements which utilize chemical analysis.
Is toxicity chemical or physical property?
Chemical: Toxicity is about a harmful material interacting chemically with other substances in the body.
What are some advantages of chemical change?
Any specific advantage; this depends on our applications, desires etc.
What are Useful and Harmful Changes?
The changes talking place in our surroundings and which are useful to us are called Useful changes. The changes which are not useful but harmful are called Harmful changes
What causes of genetic mutation?
Mutations are changes in the nucleotide sequences in a genome. Most often, these minor mistaks are corrected by in-built repair mechanisms and many mutations go unnoticed an are not harmful. Harmful mutations cause diseases in many cases. There are several factors that promote the formation of mutations. These factors are called mutagenic agents. Mutagenic agents are divided into: chemical and physical mutagens. UV radiation is an example of a physical mutagen and Nitrous acid is an expample of a chemical mutagen
