Which of the following reactions obeys the Law of Conservation of Atoms?

H2O → H2 + O2

CuSO4 + Zn → ZnCl2 + Cu

Zn + HCl → ZnCl2 + H2

PbCl2 + Al → AlCl3 + Pb

Zn + 2HCl → H2 + ZnCl2

15. During inspiration, A. alveolar pressure exceeds atmospheric pressure. B. transpulmonary pressure increases. C. the diaphragm relaxes. D. intrapulmonary pressure is less than atmospheric pressure

A 2.5 g sample of french fries is placed in a calorimeter with 500.0 g of water at an initial temperature of 21 °C. After combustion of the french fries, the water has a temperature of 48 °C. What is the caloric value (kcal/g) of the french fries?

Which statements are true about electrolysis? Check all that apply. Electrolysis requires an acid be present. Electrolysis is described by two half-reactions. Electrolysis is not an industrial process.

What is concentrated salt solution added to the tube with the cheek cells?

Which would least strongly attract electrons from other atoms in a compound? elements of group 1 elements of group 2 elements of group 15 elements of group 17

Which situation describes evidence of a chemical change? A. When food color is added to water, it changes color. B. A solid changes into liquid when heated. C. A solution feels warm after a cool solid is added to it. D.

Identify the intermediate in the halogenation of alkanes. a) Anionb) Cationc) Radicald) Dimer

An archer pulls her bowstring back 0.370 m by exerting a force that increases uniformly from zero to 264 N. (a) What is the equivalent spring constant of the bow?

If 5.0g of KCLO3 is decomposed, what volume of O2 is produced at STP?

For metallic structures, does the packing efficiency (see sample exercise 12.1 in textbook) increase or decrease as the number of nearest neighbors (the coordination number) decreases?