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hey guys i will give d answer once i relaxe myself

Density of an object was first discovered by a Greek scientist called Archimedes. It is simply a measurement of how compact the matter that made up the mass of an object is. If the matter is tightly held together the density of the object will be higher while the reverse is the case.

Density can also be defined as the mass per unit volume of a substance.

The density of an object can be obtained by using the mass of the object divided by the volume of the object.

Density = mass / volume (kg/m3)

The SI unit of density measurement is kg per cubic meter (kg/m3). Density can be found in use in many different areas in physics.

The symbol for density is the Greek letter rho, :

From the above explanations, it is obvious that between solids, liquids and gases, solids are the most dense(have the highest density), followed by liquids and then gases.... more updates to follow

It should be noted that ice has a lower density than either water (freshwater) or seawater (saltwater), so it will float in them. Seawater, however, has a higher density than freshwater, which means that the seawater will sink when it comes in contact with freshwater. This behavior causes many significant ocean currents and the concern of glacier melting is that it will alter the flow of seawater -- all from the basic functioning of density.

It should also be noted that
1000 kg/m³ = 1000 g/l = 1 g/cm³ you really need to be careful of this when converting

thumb up bro nice one

d first answer is 2.85s
d second is 360g
d third is 50cm
fourth.is 11.36km
fifth is 480k or #4.80

Benjaminbest:
d first answer is 2.85s
d second is 360g
d third is 50cm
fourth.is 11.36km
fifth is 480k or #4.80

Bro 4 daht No 3...supposed 2 b in metres..U Ryt Tho.50cm is 0.5 or 1/2metres..

what volume of Carbon(II)Oxide is produced by reacting excess carbon with 10dm cube of oxygen?

Destilo:
what volume of Carbon(II)Oxide is produced by reacting excess carbon with 10dm cube of oxygen?

2C + O₂ --> 2CO
From the equation above, we can see that 2 moles of CO are produced when 1mole of Oxygen reacts with excess carbon and according to gay lusaac's law of combining volumes, the ratio of the volumes will be constant i.e.O₂ : CO = 1 : 2 ;
Therefore, 10dm^3 of Oxygen will produce 2(10) = 20dm³

If we are to follow the syllabus, the picture below shows the first four topics in chemistry.....

mathefaro:
If we are to follow the syllabus, the picture below shows the first four topics in chemistry.....

Bros where you given the syllabus at the bank? They collected my 5k but didn't give me brochure nor syllabus nor THE LAST DAYS AT FORCADOS HIGH SCHOOL, what am I suppose to do?

tuwayz:
Bros where you given the syllabus at the bank? They collected my 5k but didn't give me brochure nor syllabus nor THE LAST DAYS AT FORCADOS HIGH SCHOOL, what am I suppose to do?

Nope, this is the syllabus that i've been using for my students for the past 3 years. They've not changed it since then and i'm sure, it'll still be the same this year

hey guys i was so disapointed by my browsing network today dat was why i was unable to drop sometin do bear with me and stick around till tomoro

Elements, Mixtures and Compounds

Chemistry is the study of physical matter, which is classified in many different ways, such as state of matter (gas, liquid or solid), chemical form (element, mixture or compound), chemical structure (atoms or molecules, etc.) and so on.

It is important to understand the terms "element", "mixture" and "compound", because these convey useful information.
Another useful term is the word "substance", which can be used to refer to either an element or a compound - but not to a mixture because a "substance" always has a definite composition. The most general term is "matter" which can be used to refer to any of "substances", "elements", "mixtures" or "compounds".

Elements Mixtures and Compounds

The categories of elements, mixtures and compounds are described in words below:
Elements
consist of only one type of atom - which may, or may not join together to form molecules or large structures, therefore:
can exist as either atoms (e.g. argon) or molecules (e.g., nitrogen)
cannot be broken down into a simpler type of matter by either physical or chemical techniques - though some larger elements break-down spontaneously due to being radioactive.

Elements are listed in the periodic table.

Many elements are found in nature and so may be called "naturally occurring elements". Other elements have not been found in nature but can be produced in the laboratory. A few more elements are thought to exist but are very rare and even if produced would only exist for a very short time because they are radioactive and would quickly decompose into other elements whose atoms are smaller.

Mixtures
consist of two or more different elements and/or compounds - physically intermingled,
can be separated into their constituent parts by physical means (e.g. distillation of liquids or separating magnetic and non-magnetic solids using a magnet), and
have many of the properties of their constituent parts (e.g. the element "oxygen" is part of the mixture "air" and some of the properties of air are due to the oxygen, albeit somewhat reduced compared with pure oxygen due to the presence of the other constituents of the mixture called "air".

There are many different types of mixtures, some of which have special names. These include:

Homogeneous Mixtures - in which the two or more substances that form the mixture are evenly distributed throughout the mixture, e.g. vinegar is a homogeneous mixture of ethanoic acid and water.
Heterogeneous Mixtures - in which the two or more substances that form the mixture are not evenly distributed throughout the mixture, e.g. oil and water.
Solutions - a special type of homogeneous mixtures in which one substance (called the "solute" is dissolved in another substance (called the "solvent", e.g. salt water is salt dissolved in water - in such a way that the salt no-longer exists as solid particles within the water.
Suspensions - heterogeneous fluid mixtures containing solid particles large enough for sedimentation, which means that the particles (compare with the "solute" part of a solution) will eventually settle to the bottom of the container (unlike in the case of colloids, below), e.g. particles of sand in water.
Colloids - heterogeneous mixtures in which one is substance microscopically dispersed evenly throughout another substance (for comparison, the size of the particles of "solute" are greater than in the case of a solution, but much smaller than in the case of a suspension). There are many naturally occurring colloids, e.g. milk. Colloids are very important in biology and medicine.
Alloys - mixtures in which the main element (or elements) are metal(s). A more technical definition of an alloy is "a partial or complete solid solution of one or more elements in a metallic matrix". Common examples of alloys include bronze, brass and steels.



Compounds

consist of atoms of two or more different elements bound together chemically,
can be broken down into a simpler type of matter (elements)
by chemical means; but not by physical means
always contains the same ratio of component atoms.
have properties different from their component elements (e.g. the compound water (H2O) is a liquid at room temperature and pressure and has different chemical properties from those of the two elements, hydrogen (H2) and oxygen (O2), from which it is formed).

A compound is a pure substance that consists of two or more elements chemically combined in a fixed proportion, that can be further subdivided into simpler substances by chemical (not physical) means only.
So, if a quantity of a material consists of atoms of two or more elements joined together, always in the same ratio, then the matter forming that material is a compound.

Compound whose molecules consist of one atom of one element chemically joined with two atoms of another element.

A molecule is the smallest part of a compound whose properties are those of the compound.
A compound can be represented by using a chemical formula.

Elements, Mixtures and Compounds and Atoms and Molecules

A common question concerns the smallest identifiable units within elements, mixtures and compounds whose structure and properties explains the properties of the bulk material (element, mixture or compound).
Are they atoms or molecules, or something else ?

This can be answered in both words and diagrams. It often helps to include both.
More Advance Note: There are also even smaller units called "sub-atomic particles" which, together, form atoms.

Elements, Mixtures, Compounds - Atoms and Molecules

Do elements, mixtures and compounds consist of atoms or molecules ?

Answer in words:

Elements can consist of either atoms or molecules but if molecules then those molecules are formed only from atoms of the same type (that is, atoms of the same element).
For example, a molecule of oxygen consists of two atoms of oxygen and has the chemical formula O2 where "O" is the chemical symbol of the element oxygen.
Mixtures can consist of either atoms or molecules - but must include at least two different atoms or molecules.
For example, a mixture of neon and argon gases would consist of atoms only because both neon and argon exist as atoms rather than as molecules. However, a mixture of oxygen and nitrogen gases would consist only of molecules because oxygen gas exists as oxygen molecules (O2) and nitrogen gas exists as nitrogen molecules (N2). A mixture of neon and nitrogen gases would consist of atoms of neon and molecules of nitrogen.
Compounds consist only of molecules (not individual atoms) and all the molecules of any one compound are the same. For example, methane gas has the chemical formula CH4 because each molecule of methane is formed from one atom of carbon, whose chemical symbol is "C", and four atoms of hydrogen, whose chemical symbol is "H". Pure methane gas does not include any other atoms or molecules apart from the methane molecules described by the formula CH4.

This can be summarized in a table:


Atoms

Molecules
Elements


Either atoms or molecules, but only of one type of atom.
How do you know which it is ?
Solid elements, e.g. metals, consist of many atoms of the element packed very densely together, e.g. copper, whose symbol is "Cu". Only a few elements exist naturally as a liquid at standard temperature and pressure. An example is the metal mercury, whose symbol is "Hg", which takes the form of many atoms that can move around each other easily but not away from the other atoms into the surrounding space, as in the case of gases.
Many elements exist as a gas at standard temperature and pressure. In some cases, e.g. the inert or "noble" gases, the gas exists in the form of individual atoms, whereas in other cases the gas exists in the form of molecules (e.g. diatomic molecules - which means that each molecule is formed from two atoms of the the element, attached together), e.g. oxygen gas, whose formula is O2, nitrogen gas whose formula is N2 and hydrogen gas whose formula is H2.
Elemental gases exist as either atoms or molecules according to the size and structure of the atoms of that element - which is usually explained later in school chemistry lessons.

Mixtures
Any combination of (different) : atoms + atoms
or molecules + molecules
or atoms + molecules

That is, in the case of mixtures there must be at least two different types of atoms,
or at least two different types of molecules,
or at least one type of atom plus at least one type of molecule present.

So, a mixture of gases may consist of molecules of the element oxygen (O2) plus molecules of the element nitrogen (N2) plus molecules of the compound carbon dioxide (CO2).
Alternatively, a mixture of gases may consist of atoms of neon (Ne) and atoms of argon (Ar), and so on ...
Compounds

Compounds consist of only one type of molecule: A molecule is the smallest part of a compound whose properties are those of the compound.

mathefaro:
Nope, this is the syllabus that i've been using for my students for the past 3 years. They've not changed it since then and i'm sure, it'll still be the same this year

Sounds like you are the tutor pls what about the last days at forcados high school how are we to get it?

tuwayz:
Sounds like you are the tutor pls what about the last days at forcados high school how are we to get it?

you'll get that when you go for the registration at the cbt centres but you have to go along with the receipt which will be given to you at the bank

mathefaro:
you'll get that when you go for the registration at the cbt centres but you have to go along with the receipt which will be given to you at the bank

Ok thank you sir

Umartins1:
Guy, I didn't want to comment at first but I couldn't hold on to the frustration.

I is NEVER plural, it is rather a singular pronoun. In fact, it is a first person singular pronoun and therefore attracts a singular verb such as am, was etc.

Where did you school? It is quite absurd seeing that you can't differentiate between HAS and HAVE. HAS is a present tense, singular- it is the opposite of HAD. HAVE on the other hand is the past tense of both HAS and HAD.


NB: there are exceptions to the rule of concord though, as illustrated in the example you gave.

Hmmm... One would have tot u r a linguistic genius but neither m I. Did I see something like have is the past tense of has n had? Confirm dat pls.

gudmuni everybody how was ur night my special tanks go to mr mathero for his splendid work yesterday. Tanks

tuwayz:
Ok thank you sir

you're welcome bro

Good morning people..
I guess it's my off day today, neither biology nor agric ain't my thing. Nevertheless, I'm open to any question within my jurisdiction(math, Phy & chem)..
Have a great day guys

does any one here have any idea on biology jamb syllabus

Benjaminbest:
does any one here have any idea on biology jamb syllabus

I'll provide that later in the day, duty calls for now

mathefaro:
I'll provide that later in the day, duty calls for now

alryt

Umartins1:
Guy, I didn't want to comment at first but I couldn't hold on to the frustration.

I is NEVER plural, it is rather a singular pronoun. In fact, it is a first person singular pronoun and therefore attracts a singular verb such as am, was etc.

Where did you school? It is quite absurd seeing that you can't differentiate between HAS and HAVE. HAS is a present tense, singular- it is the opposite of HAD. HAVE on the other hand is the past tense of both HAS and HAD.


NB: there are exceptions to the rule of concord though, as illustrated in the example you gave.

"I" is a singular pronoun but it does not attract singular verbs...It only attracts plural verb except "am"...U can't say "I eats" but "I eat"...Ur information on has, have and had is wrong also...Has and have are used in d present perfect tense not present tense..Wondering why someone didn't correct dix guy earlier..Look at how he's giving wrong information in an insulting way..

Thewhizzkid1:
"I" is a singular pronoun but it does not attract singular verbs...It only attracts plural verb...U can't say "I eats" but "I eat"...Ur information on has, have and had is wrong also...Has and have are used in d present perfect tense not present tense..Wondering why someone didn't correct dix guy earlier..Look at how he's giving wrong information in an insulting way..

check the previous pages, it has been corrected.

Biology syllabus in pdf format

i jst left my working premises now am on my way home...mathfaro tanks for d biology pdf file

mathefaro:
check the previous pages, it has been corrected.

Ok sir...I didn't see it b4...U're really doing a good job here...But pls let more emphasis be laid on that "has", "have", "had" and even"I"...The way they are used in sentences is very important because questions are usually set from there in jamb and post utme..For example:
* "Had" cannot be used in a sentence when it contains only one clause..
I also noticed that u guys are not laying emphasis on
English...English is one of the subjects science students fail most...So it should also be paid real attention to..Jux my opinion..

I tink is beta if u take d lessons page by page rather dan following d syllabus because d syllabus is not arrange according to how d chapters are in d textbook. So guys what do u tink

mathefaro:
Biology syllabus in pdf format

displaying corrupted file on my fone