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Yeah, but let's say when we freeze the above mentioned compounds. Ice is quite brittle (frozen water).

Do you know whether Covalent compounds (Covalent Molecular & Covalent Network substances) are brittle or not? If they are, how does that work (in terms of molecular level)?

Oh, so the 'cutting' of metal is essentially just applying a lot of heat energy (through friction) and then melting it apart? Ahh right, I confused the definition of brittleness. Makes more sense with the definition below: A textbook I was going through stated this "If the ionic crystal is...

So is there way to break the Covalent bonds (intramolecular bonds) for Covalent molecular substances? If so, what would the outcome of it look like? Right, but what I'm trying to say is; would an Ionic substance (tablet) dissolved in water (with the result of free ions) have the same impact on...

There is also another question I have: H2O is a covalent molecular substance and is held together by Strong covalent bonds and weak intermolecular forces. Yet when we boil it, the intermolecular forces are gone but the covalent bonds still hold together the Hydrogen and Oxygen atoms. Whereas say...

Anyone got answers to Q5 and Q6?

Right, thanks. I’ve learnt about Lewis Dot Diagrams and valence shells. But you said Silicon Dioxide cannot be Ionic because they’re not giving away electrons and such. But if a basic question just asked whether Silicon Dioxide was Ionic compound or Covalent, I would automatically assume it’s...

Right, so essentially Ionic and Metallic compounds aren't molecules due to the fact that for Ionic compounds it's a crystal lattice which involves the atoms joining continuously and Metallic compounds are between the atoms and electrons whereas Covalent compounds tend to just have separate...

And this is all due to electronegativities of each element I'm guessing? So for example if they had asked in an exam whether Silicon Dioxide was a Covalent compound or not and the only info I knew at the time was that Covalent compounds occur between non-metals (plus the fact the exam did not...

Let's say those compounds did exist. They would all have the same properties (same melting/boiling point, electrical/heat conductivity, etc.)?

How about for Ionic and Metallic compounds? They don't have intermolecular forces but rather Ionic and Metallic bonds between them. How come they don't have any intermolecular forces? For example, NaCl has Ionic bonding due to the strong electrostatic attraction between oppositely charged ions...

But since friction is a force, if the force is smaller than the actual force of the projectile; how would the projectile slow down? I had thought that you would need a greater force than the projectile to actually make an impact (i.e. slow it down). Since 0 net force means object travels at rest...

So a compound with the same ratio of atoms would essentially be the same as the most simple ratio of the same compound? So meaning the more atoms there are, regardless it would be the same. I had previously thought that when there are more or less atoms, even with the same ratio there would be...

As we haven't learnt about Momentum yet, I am a bit confused with your explanation - hopefully I'll understand when we learn about Momentum. Why does an object's Inertia increase if the acceleration is constant? I understand the Velocity is increasing, but wouldn't you only care about...

Got a few questions I was wondering on. 1) How does the aluminium oxide layer prevent oxidation and why is Aluminium foil good for food? 2) How does the wall exert a force let alone an equal one on a ball? Isn't it F=Ma and the Mass are different for each? How can a stationary object exert a...

What's the work like? Also, is your job located in NSW or is it somewhere else? Do people usually transfer jobs from here to the US or Europe after they work for a while (so for example, company from here sends people to Boeing or Airbus for example)? Also, does Qantas offer jobs for...

So no hope in Australia?

So I've always had an interest in planes and spacecraft, so from a really early point in my life I had decided to pursue a career in Aeronautical/Aerospace Engineering. But as the HSC is slowly approaching, I was wondering whether it'd be a good Engineering career to choose (especially in...

1) Say there are two cars; one with a force of 400N and the other one at 800N. Their masses are the same, therefore they have different acceleration. If they were to collide head on and the drivers weren't wearing seatbelts, would the driver from Car A (400N) fly backwards with the car or would...

Thanks. Also, if we were trying to 'create' Water and H2 + O ---> H2O wouldn't be safe; why do so many people come up with that equation instead of 2H2 + O2 ---> 2H2O? The second one makes much more sense since Oxygen is Diatomic (and stable) and it's not a 'risky' experiment if it were to be...