1)Does rock music make the heart beat faster? What is the hypothesis for this question? :?: :?:


2)what is the best way to keep bacteria from growing in gym shoes?
Name the dependent and independent variable for the test of this question? :?: :?:
:imdrowning: :sad:

Dr.Daniel:

Jamesbond:

Hi, can u pl tell me why it can't be B? :nailbite:

When I look at B, I think of a metal pot with either a metal or glass cover. That's too much surface area to radiate heat. One other thing to think about is that the decomposition of calcium carbonate produces calcium oxide and carbon dioxide gas. If we are decomposing something, we probably want to collect at least one of the products, which you can't do in a covered pot. A test tube you can put a stopper and glass tube in the top to collect the gas for example.

I think the assumption here is that we are doing this in a chemistry lab and not on an industrial scale. I say that because these images are typical chem lab apparatus. But actually B is more often used for cooking food than in a chem lab, although occasionally it may have use in the lab.

:thankyou: :salute:

Dr.Daniel:

usaik:

http://i57.tinypic.com/2dij4np.jpg\">


Hi,

Can someone help me with the question above? What is the answer and why? Thank you so much.

It is D. If you really want to heat a solid powder strongly with a Bunsen burner, the test tube is the way to go. What you want to heat can be surrounded by the Bunsen flame outside the glass. In a flask there is too much extra area of glass that conducts heat away so it is harder to get something as hot. Check out this video. See how the flame surrounds the powder - there's no way you could get it this hot with a big flask.

https://www.youtube.com/watch?v=pnfjXMNBZFo

Hi, can u pl tell me why it can't be B? :nailbite:

Just4Fun:

Jamesbond:

Are the year1 parents also been invited for the kiwi cup match tmw?

No, only for y1 students
:rahrah: :rahrah: :rahrah:
Cheers for our boys !

Ok

Are the year1 parents also been invited for the kiwi cup match tmw?

Camp was tough as well as enjoyable.

Yes :boogie:

iFirefly:

Jamesbond:

[quote=\"iFirefly\"]
Hi Jamesbond.. You boy is joining RI ? Congrats & Welcome !!

The pair of shoes looks fine. My boy's shoes have even less white..

Thx. I am jamesbond. Not my parents.

Oh sorry.. So, the person who asked lots of questions at the PSLE Math & Science threads was you or your parent ? [/quote]It's me :boogie:

iFirefly:

Jamesbond:

http://i61.tinypic.com/2lmw0ux.jpg\">

Can I wear this shoe to RI? Is this much blue color allowed?

Hi Jamesbond.. You boy is joining RI ? Congrats & Welcome !!

The pair of shoes looks fine. My boy's shoes have even less white..

Thx. I am jamesbond. Not my parents.

http://i61.tinypic.com/2lmw0ux.jpg\">

Can I wear this shoe to RI? Is this much blue color allowed?