Which property of a substance is not affected by physical changes?

A) reactivity

B) size

C) shape

D) position

Which balanced equation represents an endothermic reaction? (1) C (s) + O2 (g) → CO2 (g) (2) CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l) (3) N2 (g) + 3H2 (g) → 2NH3 (g) (4) N2 (g) + O2 (g) → 2NO (g)

Explain some of the benefits of biotechnology

Does bleach cause a physical or chemical change

What is the covalent compond using prefixes for P4S5

Determine the number of significant figures in each measurement. 12.90 s

4) Acompound has an empirical formula of Na2co3, and a molar mass of 3.18g/mol. Find its molecular formula.

How many molecules of glucose, C6H12O6, can be "burned" biologically when 283.2 grams of oxygen is a available?

Why does acids that has been accidentally spilled on a book cause the colour of the book cover and the ink to change?

How many moles of H2O will be required to make 19.2 moles of O2

Calculate the energy required to heat 406.0mg of cyclohexane from 33.5°C to 38.9°C. Assume the specific heat capacity of cyclohexane under these conditions is 1.85·J·g^-1K^-1. Be sure your answer has the correct number of significant digits.