Achemical change is a change in the of a substance.
a. composition
c. temperature
b. appearance
d. melting point

Which statement explains why the bonds between non metals tend to be covalent? the bonds are found to be nondirectional they have large differences in electronegativity they have small differences in electronegativity they have ions that produce an electrostatic pull

Which elements are found in glucose, the product of photosynthesis? a. carbon, hydrogen, and oxygen b. carbon and hydrogen c. carbon, nitrogen, and oxygen d. hydrogen, nitrogen, and carbon

If you try to move a piano and are unable to move it, did you perform any work in the scientific sense of the word? yes or no?