Which could be the catalyst in a chemical reaction?

Which sentence best describes the formation of igneous rock? A - lava on the surface dries up and makes arock B_melted rocks cools and forms crystals C_rocks under tremendous heat and pressure D_magma is melted rock underground

Which is the correct terrm that indicated that an oceanic crust is pushed downward by a colliding contintental crust? A. tectonic rejuvenation B. subduction C. uplift D. drifting crust

Which is smaller 4 gallons or 33 pints?

How does the ozone layer over the Arctic change with the seasons?

What is the % mass of a solution composed of 265mg of glucose dissolved in 3 grams of water?

The relationship between pressure and temperature of a gas, when volume and moles of a gas are held constant, is: P*T = k. TRUE FALSE

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.