Ascientist is examining an unknown solid. which procedure would most likely determine a chemical property of the substance? heating it to find the temperature at which it melts exposing it to a flame to see if it catches on fire hitting it with a hammer to determine if it breaks or bends placing it in water to find out whether or not it dissolves

It is B because with fire there is always a reactin and a physical change.

The answer is:

exposing it to a flame to see if it catches on fire.

The explanation:

- let's discuss all the choices to figure out the correct one :

1) the first one when we heat the solid to find the temperature at which it melts we here talking about a melting point ,and this is a physical property.

2) the third answer hitting it with a hammer to determine if it breaks or bends,

we here talking about ductility and the ductility is a physical property.

3) The fourth answer placing it in water to find out whether or not it dissolves, we here talking about solubility, and the solubility is one of a physical properties also.  

4) so, the right answer will be( B) exposing it to a flame to see if it catches on fire because we are talking here  about the flammability and this is a chemical property.

when the chemical property is when the identity of the material changes for example flammability and toxicity.

and the physical properties are like density , shape , melting point , solubility  

u=13

v=30

s/t=u+1\2at

=13+431/2

=13+265.5

=278.5

  1.the balanced   chemical equation is as below

cu +   2 ag(no)₃ → cu(no₃)₂   +2 ag

2.the   much silver   produced   is   50.9 g

step 1: find the   moles of cu

moles =   mass÷   molar mass

  from periodic table the molar mass of cu = 63.5 g/mol

moles is therefore = 15.00 g÷ 63.5 g/mol = 0.236   moles

step 2: use the mole ratio to determine the   moles of ag

from equation above   cu: ag   is 1: 2

therefore the moles of ag   =0.236   moles   x 2/1 =0.472   moles

step 3: find the mass   of ag

mass = moles x molar mass

from periodic table   the molar mass of ag =107.87 g/mol

mass   = 0.472   moles x 107.87 g/mol = 50.9 g

3.   the   much   silver   collected worth is   1.797 oz

  convert   50.9 g   to oz

that is   1 gram = 0.0353 oz

          50.9 grams =?   oz

by cross multiplication

={(50.9 grams x 0.0353 oz) / 1   gram}   =1.797 oz