Which choice describes a community?

A. desert

B. a forest of birds, insects, and squirrels

C. a hole in which a snake lives

D. a desert of sand, rocks, hawks, and snakes

A scientist is studying how certain factors affect the rate of a particular reaction. She observes that under one set of conditions, the reaction proceeded much faster than under a different set of conditions.

Which of the following statements about horizons is true? a. They are characterized by whether they are solid, liquid, or gas. b. They are represented by Roman numerals. c. All soils have completely different horizon patterns. d.

How is heat transferred when a person holds a pen that is already at body temperature?

A confused student was doing an isomer problem and listed the following six names as different structural isomers of C7H16. a. 1-sec-butylpropane b. 4-methylhexane c. 2-ethylpentane d. 1-ethyl-1-methylbutane e. 3-methylhexane f.

How can a permanent magnet be damaged? a. cut the magnet in half b. heat the magnet up c. strike the magnet with a heavy blow d. both the second and third choices above

What is the mass (in grams) of 9.09x10^24 molecules of methanol (CH3OH) ? AND How many moles of N are in 0.183g of N2O?

What are the basic building blocks of matter? A) molecules B) atoms C) electrons D) compounds

How does an atom with too few neutrons relative to protons undergo radioactive decay? * by converting proton to a neutron by converting a neutron to a proton by emitting an alpha particle

What is the chemical formula for the compound formed between sodium and iodine?

8. Write a balanced chemical equation showing how you could prepare each of the following salts from an acid-base reaction: KNO3, NaBr, and Cas.