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  

the simple machine has three main features. they are:

fulcrum is the center point or pivot point of the machine. effort is input force/ applied force. load is external force/ output.

the keisha 's machine labels are

x : load

y: fulcrum

z: lever

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s