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Science questions and answers page 2



How to predict a formula of a compound???

I have a big trouble in predicting for example zincsulphide zn+2 s-2 But in the lattice each zinc atom is bonded to 4 sulphur atoms, so whi...
15 days ago with 1 answer.

Valency of a metal

Is valency of a metal the no. Of electrons in the outer shell of an element???
15 days ago with 1 answer.

Big Bang

What caused the big bang? How did it come out of nothing? And if there was somthing that triggered it, how did substances get there in the first p...
16 days ago with 13 answers.

Evolution

Then why doesnt it happen now??? Why dont humans have gills??? Or trees have feathers??? You think that we came from a rock?? Why dont we have half...
16 days ago with 27 answers.

Bonds-covalent,ionic,giant covalent, giant atomic, giant metallic..

..lattice, giant covalent bonds, I have a great issue in those, I actually dont know how to tell if a compound or an element is which bond, please ...
16 days ago with 1 answer.

Hard physics problem see if you can solve :d

A sphere with a radius of 15 cm rolls in a level surface with a constant angular speed of 10rad/s. To what height on a 30 degree inclined plane wil...
17 days ago with 0 answers.

Words with same meanings related to biotechnology

Words of same meaning relating to biotechnology
18 days ago with 0 answers.

If a 0.15 kg mass is suspended 75 cm from the pivoted end

If a 0.15 kg mass is suspended 75 cm from the pivoted end, what is the tension in the string?
19 days ago with 0 answers.

energy transformations

does anyone know about energy transformations I need to now about the energy transformations of a circuit board, a speaker I know theres electromag...
19 days ago with 0 answers.

What makes a star glow???

I need to know asap!!! What makes a star glow different colors??? Please just help me find some info about this!!! Help please!!! Thanks :)
19 days ago with 6 answers.

Mole?

What is the history of the mole? Who came up with it? Why was it created? Wats the actual # for a mole? When was it created? What does it mean...
19 days ago with 2 answers.

Possibilty of charging an electrical device with body heat?

would if actually be technically possible to charge a mobile phone with your own body heat? I'm not a sciency type person so I wouldnt know, I just...
23 days ago with 2 answers.

How do you find the speed of an object without a given time

How do you find the speed of an object without a given time.the problem is "an archer fires a 30-kg arrow form a bow the archer exerts an average f...
24 days ago with 1 answer.

What is a ecofact

What is a ecofact
24 days ago with 1 answer.

Phyiscal science

what is the answer to this question Calculate Acceleration The download force of gravity and the upward force of air resistance on a ball are bot...
27 days ago with 0 answers.

Physical science

what is the answer to this question Calculate Net Force two students push on a box in the same direction, and one pushes in the opposite direction...
27 days ago with 0 answers.

Evolutionary reason for naturally skinny people?

What is the evolutionary reason why there are naturally skiny and tall people like myself like its just seems like if it were the caveman days peop...
28 days ago with 3 answers.

How can I find the melting point of a sudstance?

How can I find the melting point of a sudstance?
29 days ago with 3 answers.

What Cloud Has...?

I'm studying 3 types of clouds:stratus,cumulus,and cirrus. Could you help me with these problems (I don't have my science book and I can't find any...
29 days ago with 1 answer.

which chemical is deoxidised

Well in science, I have finished my homework, but I was confused about the way something was worded... ok... well here is a chemical equation: cop...
about 1 month ago with 1 answer.

How many muscles does it take to frown?

19, 47,62?
about 1 month ago with 3 answers.

How many muscles does it take to smile

How many muscles does it take to smile 17,31,57?
about 1 month ago with 1 answer.

What are two words that describe dimitri mendeleev

Famous scientist
about 1 month ago with 1 answer.

What are fundamental frequencys?

An organ pipe is 78.0 cm long. What are the fundamental and first three audible overtones if the pipe is a) closed at one end and b) open at both e...
about 1 month ago with 1 answer.

Science Photos

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google is ur friend
Dawn spacecraft - artist's concept
xray
Tres Huevos
solar system
Just me
All 18 Science photos >>