Is spreading butter on bread a chemical change

1. What's the difference between activity and concentration? 2. At what condition they become same? 3. Why do we need activity at all? 4. Why can't we simply use concentration?

The total potential and kinetic energy of an object is called

Hydrogen is prepared commercially by the reaction of methane and water vapor at elevated temperatures.

What pressure is exerted by 932.3 g of CH4 in a 0.560 L steel container at 136.2 K?

What r positive ligands?

In the ground state, has only 1 electron in a p orbital. A. carbon B. fluorine C. hydrogen D. nitrogen E. aluminum

Which of the following is a mixture? alcohol water mercury ink

A gas occupies 3.5 L at standard pressure. Find the volume of the gas when the pressure is 1.5 atm.

What is the temperature (in K) of 16.45 moles of methane gas in a 4.95 L container at 4.68 atm?

What do we call the process by which cells obtain the energy that they need?