Substance B was heated at first gently and then more strongly in a bunsen flame. Two gases were given off, one of them brown. A yellow residue remained that neutralised both an acidic and an alkaline solution What is Substance B?

The number at the end of an isotope’s name is the number.

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