39 Which Kelvin temperature is equal to 200. oC? (1) - 73 K (2) 73 K (3) 200. K (4) 473 K

The dissociation of a weak electrolyte is suppressed when a strong electrolyte with a common ion is added to the weak electrolyte solution. a strong salt is dissolved with the weak electrolyte solution.

Ionic compounds are normally in which physical state at room temperature? a. solid b. liquid c, gas d. plasma

How do you know that melting ice is a physical change? Use words to describe what energy is What type of energy causes a rain puddle to disappear on a sunny day? A plumber uses a torch to heat a copper pipe in order to bend it.

Which of the following is not a method in which crystals form? A) crystallization B) decrystallization C) water evaporation from a solution D) cooling of magma or lava

When a certain rock formed, it contained 12 mg 40k. the rock now contains 3 mg 40k. the half-life of 40k is 1.3 billion years.

The sun is directly overhead at the equator on what day of the year? A. Zenith B. Solstice C. Equinox D. Ecliptic Isn't it the Solstice?

In the SI system of units, the mole is one of seven base units. It is frequently used in chemical calculations. However, a mole of something is just a particular quantity of it.

A student used a DCP solution (standardized to 9.98x10-4M) to analyze a sample of extract from 2.50g of solid food. The titration required 22.49mL of DCP. 87.00% of all the ascorbic acid in the food was collected in the extract.

Barium-131 is a radioactive isotope of the element barium used for gastrointestinal tract scans in doctors offices. Barium-131 has a half-life of 10 days.

The name for Na2 O in chemistry