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

(1) methane (3) tungsten

(2) propanal (4) water

What is the representative particle for barium chloride?

NaO2C (CH2) 14CH3 + CaCl2 complete the reaction

A sample of copper with a mass of 63.5g contains 6.02 x10^23 atoms calculate the mass of an average copper atom

John pushes his brother Danny on a skateboard. John applies a force of 39 N and Danny's acceleration is 0.9 m/s2. What is the combined mass of Danny and his skateboard? A. 43 kg B. 48 kg C. 31 kg D. 35 kg

The bond between which two atoms is most polar? (1) Br and Cl (3) I and Cl (2) Br and F (4) I and F

What is buffer solution?

How can you simulate the radioactive half-life of an element?

What are the horizontal rows on the periodic table?

What is 19 hundred thousandths in scientific notation

There state of matter that keeps its shape and volume when it is placed in a container