4. What is the main hydrocarbon component of natural gas? A. ethane B. ethene C. methane

7.The fact that alpha particles cannot travel very far trough body tissues is the main reason that radioactive tracers use to detect diseases in internal organs emit beta particles or gamma rays.
A. true B. false

8.A wax is an ester of a long-chain fatty acid and a long-chain alcohol. A. true
B. false

How to solve 4 nh3(g) + 5 o2(g) > 4 no(g) + 6 h2o(g) in chemistry

Answer asap need it by wednesday morning calculate the ph of 0.02m hcl best answer will be brainliest

Air pressure is measured in pascals. for a professional american football game, the ball should be inflated to about 90,000 pascals. scientists studied the effects of air temperature on the pressure inside american footballs by taking these steps: 1. prepare 100 footballs. 2. measure each football's air pressure. 3. divide footballs into 10 groups. 4. place the groups in different lockers cooled to different air temperatures. 5. after 12 hours, remove the footballs from lockers. 6. measure each football's pressure again. 7. compare the new pressures to the starting pressures. what two terms best describe the variable "air pressure inside the football" in this experiment? independent, qualitative independent, quantitative dependent, qualitative dependent, quantitative