Why does 13c - have a negative sign

Ms. markas takes a thermos bottle filled with hot coffee to work each day. The thermos bottle keeps the coffe hot by A. Using a battery-powered heating element B. Collecting solar heat energy C. Recirculating hot air inside D.

Having 23.26 g of NaOH and 18.73 g of HCl what will be the limiting reactant

Which of the following elements is a Group 1 metal? A. He B. F C. Ca D. Cs

Which solution is a buffer? • 0.100 m hno2 and 0.100 m hcl • 0.100 m hno3 and 0.100 m nano3 • 0.100 m hno2 and 0.100 m nacl • 0.100 m hno2 and 0.100 m nano2?

What factor (s) may be responsible for the ionization energy within a period? A.) The valence electrons are further from the nucleus when moving from left to right. B.

Which statement correctly describes the interaction between magnetic poles? North and south poles attract each other. North and south poles repel each other. Two north poles will attract each other. Two south poles will attract each other.

You are measuring the mass of various shapes objecys and identifying their shaped ypu then record the qualitative and quanatitave data in a table is qualitataive wnd which is quatitaive

A positively charged wire is attracted to a negatively charged piece of metal. What force causes this?

Two identical atoms from Area B bond together. What type of bond will they most likely form A. Electrostatic B. Metallic C. Ionic D. Covalent

Which would be the best way to represent the concentration of a 1.75 M K2CrO4 solution? 1.75% K2CrO4 [K2CrO4] (K2CrO4) K2CrO4, [M] = 1.75