Which substance can not be broken down by a chemical change?

(1) ammonia (3) propanal

(2) ethanol (4) zirconium

What type of reaction is shown in this thermochemical equation? a b heat → c d

Calculate the mass (in ng) of 2.33 x 1020 atoms of oxygen.

A4 L sample of gas is heated from 20 K to 200 K. What will its final volume be? A. 40 L B. 0.4 L C. 200L D. 180 L E. 20L

How does molecular shape affect polarity?

Calculate the number of kilojoules to warm 125 g of iron from 23.5°C to 78.0°C.

What is the total number of valence electrons in a sulfide ion in the ground state? (1) 8 (3) 16 (2) 2 (4) 18

Write the name and formula of the compound made of magnesium and fluorine

How was or wasn't the scientific method followed in this experment

1‑propanol (nn ‑propanol) and 2‑propanol (isopropanol) form ideal solutions in all proportions. Calculate the partial pressure and the mole fraction (yy) of the vapor phase of each component in equilibrium with each of the given solutions at 25 °C.

4. suppose you are setting up a reaction that requires an iodide salt and are planning to use sodium iodide. however, at the last minute you find that you are out of sodium iodide, so you must use potassium iodide instead.