icecalm:
Here are some questions I was able to compile from the study of matter. Tho this is coming late, I apologize for the time delayed.

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(1) Matter can neither be created nor destroyed.
True/False

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true

(2) Canonically,the building block of matter is the_______
(a) Atoms
(b) Molecules
(c) Ions
(d) non of the above

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(3) Physical change involve the formation of ________
(a) New products
(b) New molecules
(c) New mixtures
(d) non of the above

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(4) Which of this is not a chemical change_______
(a) Gas flaring
(b) Burning of coal
(c) Boiling of eggs
(d) setting of mortar

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(5) _______Change can easily be separated by ordinary separation techniques.
(a) Physical
(b) Chemical
(c) non of the above
(d) a & b

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(6) Ice can float on water because of_______ change on the bonds.
(a) Chemical
(b) Physical
(c) a & b
(d) non of the above

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(7) ________ is not a physical change.
(a) conversion of water to steam
(b) phoshorylation of glucose
(c) denaturing of protein by alcohol
(d) drying of mud

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(8.) which of the following statement is incorrect?
(a) Both physical and chemical change are sometimes associated with heat
(b) in physical change no new compound is formed
(c) chemical bonds are usually broken and new bonds are accompanied by the formation of new compounds in chemical change
(d) chemical change only involve the change of state of a given compound, not it composition.

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(9) ________ can't be considered as matter.
(a) Flavour
(b) Sound
(c) Fish
(d) Glucose

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(10) An example of compound that sublime is ________
(a) Iodine (solid)
(b) water
(c) ice
(d) molten steel

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Am interested in this, as a student!

Following to learn. Plsø do create a physics thread too

Nice page, hope you guys are really studying hard

icecalm:

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(1) Matter can neither be created nor destroyed. True/False

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geofavor debbychris & others.

Dalton was wrong.. Matter can indeed be created and destroyed..
*discussion for another day

dejt4u:
Dalton was wrong.. Matter can indeed be created and destroyed..
*discussion for another day

yeah, but it's beyond waec scope

Geofavor:

yeah, but it's beyond waec scope

yes.. More reason i wrote 'discussion for another day'

dejt4u:
yes.. More reason i wrote 'discussion for another day'

okay

mowah:
Nice page, hope you guys are really studying hard

thanks, we're trying

Geofavor:
true

aggregate 50%

NB:
1. Matter has three basic states viz. Solid, Liquid and Gas
2. A physical change is one that can be reversible by ordinary physical processes such as those separation techniques outlined in your textbooks. While a chemical change cannot.
3. All chemical reaction occur within the electrons of atoms but nuclear reaction occur within the nuclei of atoms.
4. An atom is not identified by the number of electrons it posses but by that of protons.

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(1) anything that can occupy space and has mass in the sense that it is made up of particles of any size is refer to as matter. Matter can be created and destroyed. When atoms of radioactive isotopes decay, they undergo destruction leading to the formation of new atoms of entirely different elements through a process known as nuclear fission. Similarly atoms of very light isotopes such as those of hydrogen can be fused together to produce a new atom. In this sense matter is created and likewise can also be destroyed.

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(2) Although it may be familiar to us that matter generally compose of either atoms, molecules, ions or a combination of any of the above. But it is very important to note that a substance is said to be a molecule due to the fact that it function as a "unit" and may have chemical characteristics either similar to (as in the case of oxygen gas) or entirely different from the atoms in it e.g H₂O. While ions are any atoms or molecules that posses charge. In a nutshell, both molecules and ions are made up of atoms. It follows that atoms are the (fundamental) building block of matter.

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(3) During a chemical reaction, certainly, it's possible to obtain a new mixture from a combination of compounds formed from the reaction if the compounds formed could remain in the solution (whether true or false) without reacting with each others. This new mixture is different from the mixture formed by some of the compounds of the reactants before the reaction is induced on the system (some thermal activated reactions will be adequate to explain this better). Physical change can also bring about the formation of new mixtures but in this case the mixtures are not products of the reactant but instead are merely formed by addition of new substances to the initial mixtures.

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(4) Mortar is a mixture of sand, lime (calcium hydroxide) or cement and water. On exposure to air for some time, the lime react with atmospheric carbon(iv)oxide to produce calcium trioxocarbonate(iv) that fuse sand together and the mortar is set.
When egg is boiled the protein in it will be denatured due to temperature tolerance that cause the cleavage or twist of hydrogen bonds or peptides linkage in the protein, leading to the clumping of the protein into a solid mass. Boiling of egg Is not a chemical change.

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(5) Physical Change can easily be separated by ordinary separation techniques. e.g a mixture of iron scraps and sand can be separated using a magnet.

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(6) Ice can float on water because of physical change on the bonds. The change on the bonds of water is induce by temperature. The structure of the bonds of ice is different from that of water in the sense that that of ice is opened.
NB: only bonds are being twisted not that a new compound is in ice compare to what is in water.

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(7) phosphorylation of glucose is not a physical change. It is a reaction catalyzed by hexokinesis, an enzyme that catalyze the conversation of glucose to glucose-6-phosphate in glycolysis.

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(8.) D

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(9) sound has no particle in it. It is merely a vibration that leads to the transfer of energy in the form of wave.
Flavour is a seasoner.

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(10) iodine is a solid at room temperature. This solid usually convert to vapour without any transient liquid state and thus it is said to undergo sublimation.

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geofavor what's the next chapter?

icecalm:
NB:
1. Matter has three basic states viz. Solid, Liquid and Gas
2. A physical change is one that can be revisable by ordinary physical processes such as those separation techniques outlined in your textbooks. While a chemical change cannot.
3. All chemical reaction occur within the electrons of atoms but nuclear reaction occur within the nuclei of atoms.
4. An atom is not identified by the number of electrons it posses but by that of protons.

---

(1) anything that can occupy space and has mass in the sense that it is made up of particles of any size is refer to as matter. Matter can be created and destroyed. When atoms of radioactive isotopes decay, they undergo destruction leading to the formation of new atoms of entirely different elements through a process known as nuclear fission. Similarly atoms of very light isotopes such as those of hydrogen can be fused together to produce a new atom. In this sense matter is created and likewise can also be destroyed.

---

(2) Although it may be familiar to us that matter generally compose of either atoms, molecules, ions or a combination of any of the above. But it is very important to note that a substance is said to be a molecule due to the fact that it function as a "unit" and may have chemical characteristics either similar to (as in the case of oxygen gas) or entirely different from the atoms in it e.g H₂O. While ions are any atoms or molecules that posses charge. In a nutshell, both molecules and ions are made up of atoms. It follows that atoms are the (fundamental) building block of matter.

---

(3) During a chemical reaction, certainly, it's possible to obtain a new mixture from a combination of compounds formed from the reaction if the compounds formed could remain in the solution (whether true or false) without reacting with each others. This new mixture is different from the mixture formed by some of the compounds of the reactants before the reaction is induced on the system (some thermal activated reactions will be adequate to explain this better). Physical change can also bring about the formation of new mixtures but in this case the mixtures are not products of the reactant but instead are merely formed by addition of new substances to the initial mixtures.

---

(4) Mortar is a mixture of sand, lime (calcium hydroxide) or cement and water. On exposure to air for some time, the lime react with atmospheric carbon(iv)oxide to produce calcium trioxocarbonate(iv) that fuse sand together and the mortar is set.
When egg is boiled the protein in it will be denatured due to temperature tolerance that cause the cleavage or twist of hydrogen bonds or peptides linkage in the protein, leading to the clumping of the protein into a solid mass. Boiling of egg Is not a chemical change.

---

(5) Physical Change can easily be separated by ordinary separation techniques. e.g a mixture of iron scraps and sand can be separated using a magnet.

---

(6) Ice can float on water because of physical change on the bonds. The change on the bonds of water is induce by temperature. The structure of the bonds of ice is different from that of water in the sense that that of ice is opened.
NB: only bonds are being twisted not that a new compound is in ice compare to what is in water.

---

(7) phosphorylation of glucose is not a physical change. It is a reaction catalyzed by hexokinesis, an enzyme that catalyze the conversation of glucose to glucose-6-phosphate in glycolysis.

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(8.) D

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(9) sound has no particle in it. It is merely a vibration that leads to the transfer of energy in the form of wave.
Flavour is a seasoner.

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(10) iodine is a solid at CHAPTER 2: CHEMICAL COMBINATION
Stoichiometry
Laws of Chemical Combination
Gay Lussac’s Law of Combining Volumes
Avogadro’s Law and The mole Concept
Chemical Symbols and Formulae
Equations and Their Uses temperature. This solid usually convert to vapour without any transient liquid state and thus it is said to undergo sublimation.

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geofavor what's the next chapter?

.

icecalm

CHAPTER 2: CHEMICAL COMBINATION
Stoichiometry
Laws of Chemical Combination
Gay Lussac’s Law of Combining Volumes
Avogadro’s Law and The mole Concept
Chemical Symbols and Formulae
Equations and Their Uses

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Geofavor:
icecalm
CHAPTER 2: CHEMICAL COMBINATION Stoichiometry Laws of Chemical Combination Gay Lussac’s Law of Combining Volumes Avogadro’s Law and The mole Concept Chemical Symbols and Formulae Equations and Their Uses

okay, I will post some questions on Tuesday.

I'm sorry guys, I couldn't meet up with the date I proposed but I will try to post it before Friday.

no qualms

.

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(1) The atomicity of sulphur is_________
(a) 5
(b) 7
(c) 8
(d) 3

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(2) 0.80g of Nitrogen gas combine with 1.37g of Oxygen gas to give two Oxides of mass 0.86g and 1.31g under controlled condition.
A...Which law of chemical combination does this represent
B... State the oxides likely to be formed
C... What mass of the oxides would be form if the same 0.8g of Nitrogen gas is mixed with 2.89g of Oxygen gas.

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(3) What volume of Oxygen gas in cm³ is required to produce 5 moles of Carbon(iv)oxide.
{Molar volume of gas at stp is 22.4dm³ }
(a) 112000cm³
(b) 120000cm³
(c) 160000cm³
(d) 7143cm³

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(4) Methane is a natural gas. 6.0g was mixed in a cylinder with 50g of Oxygen gas, calculate the mass of water in grams that would be formed after complete combustion.
(a) 56.25g
(b) 13.5g
(c) 28.13g
(d) 14.06g

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(5) Referring to question 4, which reactant is in excess and what volume of CO₂ in dm³ is formed.
(a) Oxygen gas, 35dm³
(b) Methane, 35dm³
(c) Oxygen gas, 8.4dm³
(d) Methane, 8.4dm³

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(6) _________ suggested the use of symbols to represent elements.
(a) Aristotle
(b) Rutherford
(c) Lewis
(d) Berzelius

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(7) Calculate the percentage by mass of Methanol (CH₃OH)

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(8.)Write a balance chemical equation to represent the combustion of propane( C₃H₈) in air.

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(9) A certain organic compound was found to contain 75% Carbon, 20% Oxygen and 5% Hydrogen. What is it empirical formula?
(a) C₉H₅O₂
(b) C₆H₁₀O₅
(c) C₅H₄O
(d) non of the above

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(10) Which one is heavier?
(a) 0.02 mole of CO
(b) 0.8g of CO₂
(c) 1dm³ of CO
(d) 1 mole of H₂

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Geofavor, DebbyChris, Abuhaneefah21, gazzylee .. please mention the others.

Geofavor:

please clear this mention.... to a dot, there was a typo.

Op why not just explain d topic and after u lay ur question .......because mi don't understand d topic u treating now and the questions luk very scary to mi

If u need a comfortable study routine add me on whatsapp for an educational adventure with other jambites. 09098280645

walanter:
Op why not just explain d topic and after u lay ur question .......because mi don't understand d topic u treating now and the questions luk very scary to mi

sorry Bro, the topics were lay before I posted the questions and you were to make studies on it, while I will explain the topic with the answers of the questions for clarity. The topics are Stoichiometry,
Laws of Chemical Combination,
Gay Lussac’s Law of Combining Volumes
Avogadro’s Law and The mole Concept,
Chemical Symbols and Formulae
Equations and Their Uses

walanter:
Op why not just explain d topic and after u lay ur question .......because mi don't understand d topic u treating now and the questions luk very scary to mi

is that why you didn't attempt any? I may post the explanation on Monday if i'm chanced.

I think Geoflavor has been hiding somewhere since I posted this questions.

icecalm:
is that why you didn't attempt any? I may post the explanation on Monday if i'm chanced.

I think Geoflavor has been hiding somewhere since I posted this questions.

lol dat can fit b hidin ....may b is busy
And wen I don't understand d questions what I my going to ans

walanter:
lol dat can fit b hidin ....may b is busy
And wen I don't understand d questions what I my going to ans

the ones you think you know. like Q 1,10,9,8,7 and 6

icecalm:
the ones you think you know. like Q 1,10,9,8,7 and 6

bro no ideal am jus lukin at it

walanter:
bro no ideal am jus lukin at it

okay go and study you will be able to attempt them.

New student in!!!well done sir/s

abuhubaidah:
New student in!!!well done sir/s

you're welcome