When pieces of zinc are added to an aqueous solution of hydrochloric acid, the solution releases hydrogen gas and a

solution of zinc chloride forms. Which two changes would likely increase the rate of this reaction?

Which of the following describes a circular current in a fluid that occurs when the fluid is heated unevenly? a Radiation cell b Conduction current C Convection cell d Emission current

5. Oxygen will make iron

Which of the following is a characteristic of a good index fossil? A. The fossil closely resembles many other types of fossils. B. The organism was restricted to only one location on Earth. C.

8th grade science Read the list of substances below: Wood, Copper, Iron, Foam Which substances are good conductors of heat? Iron and Foam Copper and Iron Wood and Foam Wood and Copper

The most condensed state of matter is A. solid B. liquid C. gas D. plasma

Actions of the non-valence electrons, diluting the force of the attraction between nucleus and valence electrons is called

Which statements accurately describe the greenhouse effect? Check all that apply. It is caused by liquids on Earth's surface. It is caused by gases in Earth's atmosphere. It warms up Earth's surface and the lower atmosphere.

How is geothermal produced

B2O3 (s) + 3C (s) + 3Cl2 (g) - - - > 2 BCl3 (g) + 3CO (g) Calculate how many moles of BCl3 are produced from the reaction of 61.0g of B203? A. 1.75 mol B. 0.0150 mol C. 51.3 mol D. 211 mol

A gas has a volume of 10 L at 0 C what is the final temperature of the gas if it volume increases to 25L