Why do sidewalks have built in cracks every few feet

Is H2 + I2 = 2HI balanced or unbalanced

One way to determine the age of a glacier is to measure its?

The only two elements in alkenes and alkynes are A. Carbon and Nitrogen B. Carbon and Hydrogen C. Oxygen and Nitrogen D. Oxygen and Hydrogen

Sodium reacts with water according to the reaction: 2Na (s) + 2H2O (l) →2NaOH (aq) + H2 (g) Identify the oxidizing agent. a) H2O (l) b) NaOH (aq) c) Na (s) d) H2 (g)

If two gases are present in a container, the total pressure in the container is equal toa. the sum of the pressures that are exerted by each of the two gases. b. twice the sum of the pressures that are exerted by the individual gases. c.

The system is said to be in dynamic equilibrium when: Select one: a. there is no longer any net change in the concentrations of products or reactants. b. the forward and reverse reactions come to a halt. c. None of these d.

You have a 1 L container of a gas at 20 C and 1 atm. Without opening the container, how could you tell whether the gas is chlorine or fluorine? a. measure the mass of the gas b. measure the speed of the gas molecules c.

A 1.268 g sample of a metal carbonate, MCO3, was treated 100.00 mL of 0.1083 M H2SO4, yielding CO2 gas and an aqueous solution of the metal sulfate. The solution was boiled to remove all of the dissolved CO2 and then was titrated with 0.1241 M NaOH.

1. According to the article, which country may have a greater population than China by the year 2050? A. China B. Kenya C. India D. Germany 2. What does the article list as one reason that drives couples in India to have more children? A.

How are the relationships of elements in a group different from the relationships of elements in a group