What is the most important question to ask to determine wheatear a change is physical or chemical

1. Which of the following reactions are metathesis reactions? (a) 2KCIO3 - 2KCI + 302 (b) Cu (NO3) 2 + Zn - > Cu + Zn (NO3) 2 (c) BaCO3 + 2 HCl → BaCl2 + H2O + CO2 (d) Na2CO3 + CuSO4 → Na2SO4 + CuCO3 ... 1

An average human bad temperature is 98.6 Fahrenheit what is the equivalent temperature in degrees celsius

A particular brand of gasoline has a density of 0.737 g/ml at 25 ∘c. how many grams of this gasoline would fill a 14.1 gal tank?

A certain gas occupies a volume of 26L when the applied pressure is 5.7atm. find the pressure in the system when the gas is compressed to a volume of 6.5L at a constant temperature

How many electrons are involved in a single covalent bond?

Liquid water is heated until it boils and becomes water gas. Which statement is true about the water?

You are conducting an experiment on plant growth. You take a plant fresh from the soil that weighs 5 kilograms (kg). Then you dry the plant overnight and determine the dry weight to be 1 kg.

What is the ratio of Fe+3 ions to O2 - ions in a neutral compound? a. 1:2 b. 2:1 c. 2:3 d. 3:2

What is the specific heat capacity of a 17.5g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C?

How can equilibrium of a closed system chemical reaction be disturbed? Select all that apply. Adding or removing products or reactants. Keeping the concentration of products and reactants the same. Keeping the temperature of the system constant.