Hello all,
As we know that underneath our wild and passionate sides there lurks some wonderful intelligent minds I was wondering if any of you know the answers to my kids homework. I am desperatly trying to help her but being irish am a thick as a plank and have no clue.
These are the questions we are stuck on, even if someone knows a great site we could look at.
4. What is an element, mixture and a compound?
5. What gas is needed for combustion
6. What products are made in the reaction of combustion?
7. What simple test could you do to prove mineral
water is not pure water?
8. WHAT THREE ELEMENTS MAKE UP ALL LIVING THINGS ON EARTH? (could be six)
Thank you people
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I haven't a scooby doo, but I know someone who will know!! They're not on at the mo, but will be later on if you haven't got the answer by then.
Mal
Mal
I'm going to risk complete humiliation here but will edit this post when the correct answers are provided (haha).
4. What is an element, mixture and a compound?
An element is comprised of atoms all of the same type.
5. What gas is needed for combustion
Oxygen.
6. What products are made in the reaction of combustion?
Carbon Dioxide and, err, water?
7. What simple test could you do to prove mineral
water is not pure water?
Boil it away and check for residue.
8. WHAT THREE ELEMENTS MAKE UP ALL LIVING THINGS ON EARTH? (could be six)
Hydrogen, Carbon, Oxygen.
4. What is an element, mixture and a compound?
An element is comprised of atoms all of the same type.
5. What gas is needed for combustion
Oxygen.
6. What products are made in the reaction of combustion?
Carbon Dioxide and, err, water?
7. What simple test could you do to prove mineral
water is not pure water?
Boil it away and check for residue.
8. WHAT THREE ELEMENTS MAKE UP ALL LIVING THINGS ON EARTH? (could be six)
Hydrogen, Carbon, Oxygen.
one out of 5 isn't bad as i did CSE chemistry over 20 years ago!
Element
Pure substances, made up of atoms with the same number of protons.
Mixtures
Mixture of pure substances. Mixtures have the properties of the different substances that make it up. Melt at a range of temperatures and are easy to separate.
Compounds
Pure substances made up more more than 1 compound which have been joined together by a chemical reaction therefore the atoms are difficult to separate. The properties of a compound are different from the atoms that make it up.
Element
Pure substances, made up of atoms with the same number of protons.
Mixtures
Mixture of pure substances. Mixtures have the properties of the different substances that make it up. Melt at a range of temperatures and are easy to separate.
Compounds
Pure substances made up more more than 1 compound which have been joined together by a chemical reaction therefore the atoms are difficult to separate. The properties of a compound are different from the atoms that make it up.
It's been a while, but I'll have a go... Just don't bet your life on any of these answers!
An element is a basic substance that appears on the periodic table. An element is comprised of atoms.
A compound is several elements that have chemically reacted and bonded together. A compound is comprised of molecules, where each molecule is itself comprised of several atoms, from one of more elements, bonded together.
A mixture is a mixing of several elements or compounds, that haven't chemically reacted to form one compound.
Oxygen.
Carbon Dioxide? I'm not sure about that one...
Stick a piece of pH paper in it; mineral water is neutral because of impurities. Pure water is slightly acidic because of water molecules coming apart, or something.
Alternatively, boil it away and see if there's any salt left at the end.
I'm guessing... carbon, oxygen, hydrogen (the last two in water)?
Not sure if that's helped you or not, but now I wanna know if I'm right or not.
Quote by mindblowing
4. What is an element, mixture and a compound?
An element is a basic substance that appears on the periodic table. An element is comprised of atoms.
A compound is several elements that have chemically reacted and bonded together. A compound is comprised of molecules, where each molecule is itself comprised of several atoms, from one of more elements, bonded together.
A mixture is a mixing of several elements or compounds, that haven't chemically reacted to form one compound.
Quote by mindblowing
5. What gas is needed for combustion
Oxygen.
Quote by mindblowing
6. What products are made in the reaction of combustion?
Carbon Dioxide? I'm not sure about that one...
Quote by mindblowing
7. What simple test could you do to prove mineral
water is not pure water?
Stick a piece of pH paper in it; mineral water is neutral because of impurities. Pure water is slightly acidic because of water molecules coming apart, or something.
Alternatively, boil it away and see if there's any salt left at the end.
Quote by mindblowing
8. WHAT THREE ELEMENTS MAKE UP ALL LIVING THINGS ON EARTH? (could be six)
I'm guessing... carbon, oxygen, hydrogen (the last two in water)?
Not sure if that's helped you or not, but now I wanna know if I'm right or not.
Sex God
Quote by mindblowing
4. What is an element, mixture and a compound?
better answers up ^^^^^ there already
5. What gas is needed for combustion
oxygen
6. What products are made in the reaction of combustion?
oxides
7. What simple test could you do to prove mineral
water is not pure water?
erm . . . maybe measure it's boiling point? or try electrolysis? pure distilled water won't conduct an electric current
8. WHAT THREE ELEMENTS MAKE UP ALL LIVING THINGS ON EARTH? (could be six)
carbon, hydrogen, oxygen
Thank you people
Sex God
Never mind the answers, most of the questions are either wrong or worded so badly as to make a meaningful answer impossible. 
Quote by mindblowing
Hello all,
As we know that underneath our wild and passionate sides there lurks some wonderful intelligent minds I was wondering if any of you know the answers to my kids homework. I am desperatly trying to help her but being irish am a thick as a plank and have no clue.
These are the questions we are stuck on, even if someone knows a great site we could look at.
4. What is an element, mixture and a compound?
5. What gas is needed for combustion
6. What products are made in the reaction of combustion?
7. What simple test could you do to prove mineral
water is not pure water?
8. WHAT THREE ELEMENTS MAKE UP ALL LIVING THINGS ON EARTH? (could be six)
Thank you people
Time or my vote,
the only one I don't believe has been answered here is 6 the answer is;
Carbon Dioxide, Heat and Waste, same as life itself...
Quote by Question 4
Just thought of an analogy for "What is an element, a mixture and a compound?" imagine you want to make some bread, you get the elements, flour, water, butter, yeast. Put them all together in a bowl knead then to get the dough mixture, bake it and the resultant compound is the bread.
Element
el·e·ment (l-mnt)
n.
1. A substance that cannot be reduced to simpler substances by normal chemical means and that is composed of atoms having an identical number of protons in each nucleus.
2. A fundamental, essential, or irreducible constituent of a composite entity.
Mixture
mix·ture (mkschr)
n.
1. A composition of two or more substances that are not chemically combined with each other and are capable of being separated.
2. A preparation consisting of a liquid holding an insoluble medicinal substance in suspension by means of some viscid material.
Compound
com·pound (kmpound)
n.
1. A combination of two or more elements or parts.
2. A pure, macroscopically homogeneous substance that consists of atoms or ions of different elements in definite proportions that cannot be separated by physical means, and that have properties unlike those of its constituent elements.
adj. (kmpound, km-pound, km-)
Consisting of two or more substances, ingredients, elements, or parts.
Quote by Question 5
ox·y·gen Audio pronunciation of "oxygen" ( P ) Pronunciation Key (ks-jn)
n. Symbol O
A nonmetallic element constituting 21 percent of the atmosphere by volume that occurs as a diatomic gas, O2, and in many compounds such as water and iron ore. It combines with most elements, is essential for plant and animal respiration, and is required for nearly all combustion. Atomic number 8; atomic weight ; melting point - ; boiling point - ; gas density at 0°C grams per liter; valence 2. See table at element.
Quote by Question 6
com·bus·tion Audio pronunciation of "combustion" ( P ) Pronunciation Key (km-bschn)
n.
1. The process of burning.
2. A chemical change, especially oxidation, accompanied by the production of heat and light.
Quote by Question 8
The elements that make up the molecules of living things are continually recycled. Chief among these elements are carbon, oxygen, hydrogen, nitrogen, sulfur, phosphorus, calcium, sodium, potassium, and iron. These and other elements, mostly occurring in energy-rich molecules, are passed along the food web and eventually are recycled by decomposers back to mineral nutrients usable by plants. Although there often may be local excesses and deficits, the situation over the whole earth is that organisms are dying and decaying at about the same rate as that at which new life is being synthesized. That is, the total living biomass stays roughly constant, there is a cyclic flow of materials from old to new life, and there is an irreversible flow of energy from captured sunlight into dissipated heat.
Sex God
Quote by marmalaid
Hello all,
As we know that underneath our wild and passionate sides there lurks some wonderful intelligent minds I was wondering if any of you know the answers to my kids homework. I am desperatly trying to help her but being irish am a thick as a plank and have no clue.
These are the questions we are stuck on, even if someone knows a great site we could look at.
4. What is an element, mixture and a compound?
5. What gas is needed for combustion
6. What products are made in the reaction of combustion?
7. What simple test could you do to prove mineral
water is not pure water?
8. WHAT THREE ELEMENTS MAKE UP ALL LIVING THINGS ON EARTH? (could be six)
Thank you people
Time or my vote,
the only one I don't believe has been answered here is 6 the answer is;
Carbon Dioxide, Heat and Waste, same as life itself...
chris you only get carbon dioxide if you're combusting a carbon compound. if you combust hydrogen you get water, so oxides is a safer bet. heat and waste are true tho, but not sure if they count as products?
;)neil x x x ;)
Couldn't quickly find an answer for no 7, but there are 2 that I can think of, one boil off a small sample and see if there is a residue (if you look on the side of a mineral/spring water bottle you can see they do this for you, they boil it off at 180º Volvic has a residue of about 110mg/l whereas Evian has about 360mg/l, that's why Evian tastes so chalky and is awful).
The other way is to measure what temprerature the water begins to boil at sea level (1bar/1ata/1atm) hope this helps...
Chris
The other way is to measure what temprerature the water begins to boil at sea level (1bar/1ata/1atm) hope this helps...
Chris
Quote by neilinleeds
Hello all,
As we know that underneath our wild and passionate sides there lurks some wonderful intelligent minds I was wondering if any of you know the answers to my kids homework. I am desperatly trying to help her but being irish am a thick as a plank and have no clue.
These are the questions we are stuck on, even if someone knows a great site we could look at.
4. What is an element, mixture and a compound?
5. What gas is needed for combustion
6. What products are made in the reaction of combustion?
7. What simple test could you do to prove mineral
water is not pure water?
8. WHAT THREE ELEMENTS MAKE UP ALL LIVING THINGS ON EARTH? (could be six)
Thank you people
Time or my vote,
the only one I don't believe has been answered here is 6 the answer is;
Carbon Dioxide, Heat and Waste, same as life itself...
chris you only get carbon dioxide if you're combusting a carbon compound. if you combust hydrogen you get water, so oxides is a safer bet. heat and waste are true tho, but not sure if they count as products?
;)neil x x x ;)
Quite right Neil, a is what is produced, so heat, light and waste do count (then I looked it up and product is a substance that is produced, but if that is the case it shouldn't work on something intangible like maths where the product of 2 and 2 is 4, or instance)
Good to speak to you Neil!
Sex God
Quote by Heather
Of course, you lot do realise you've just been taking part in a PHD thesis into the study of Internet social groups and how they respond to pleas for help from total strangers....
All of these answer are freely available via most search engines.
Did I pass...?:D :D
You Googled that, didn't you? :lol2:
