Heating Curve

Temperature (C)

20

100

200

500

600

700

1

BL

300 400

Time (sec)

As temperature of this substance rises from 20°C to 50°C, the substance

heat and its kinetic energy

absorbs; increases

Atoms of elements that are in the same group have the same number of a. protons. c. valence electrons. b. neutrons. d. protons and neutrons.

A transformer has a primary voltage of 115 V and a secondary voltage of 24 V. If the number of turns in the primary is 345, how many turns are in the secondary? A. 1,653 B. 690 C. 72 D. 8

Calculate the molarity of s2o32 - if 3.0 ml 0.10 m k2s2o8, 2.0 ml 0.10 m k2so4, 1.0 ml 2% starch, 2.0 ml 0.010 m na2s2o3, and 5.0 ml 0.20 m ki are mixed.

Nitrogen dioxide dimerizes to give dinitrogen tetroxide: 2NO2 (g) → N2O4 (g). At 298 K, 12.55 g of an NO2/N2O4 mixture exerts a pressure of 0.963 atm in a volume of 6.92 L. What are the mole fractions of the two gases in the mixture?

Will nitrogen atoms form bonds with other atoms? why?

How much more acidic is an acid with a pH of 6 than water with a pH of 7?

What pressure in atmospheres is equal to 45.6 kPa?

Which statements describe the principles of the Big Bang theory

Is ice cream a mechanical mixture or solution why?

Which term is used to describe the attraction that an oxygen atom has for the electrons in a chemical bond?