The decay of which radioisotope can be used to estimate the age of the fossilized remains of an insect?

(1) Rn-222 (3) Co-60

(2) I-131 (4) C-14

Which of the following conditions would decrease the ability of a person to hear a sound? A. The distance to the sound source becomes shorter. B. A wave loses energy as it moves through a medium. C.

Which of the following has the largest radius? a. Na b. Cl- c. Rb+ d. Sr e. Cs

an element p has atomic number 13 while q has the atomic 16 ... write down electric configuration of p and q

A student reacts 89g of salicylic acid with 21 ml of acetic anhydride producing 11.3g of acetyl salicylic acid. what is the percent yield of the reaction?

mickey reacts magnesium with 1.0 M of hydrochloric acid. the reaction tales 2 minutes and 34 seconds to complete. what are 2 ways he could slow down the reaction?

When dos the spring tide occur

As ice transforms into steam, Question options: new molecules are formed. the types of atoms are changed. energy is absorbed by the molecules. the mass of the molecules is increased.

Why do chemists consider the periodic table so useful?

Plates include large sections of Earth Oceanic or Continental

How many joules of heat are needed to raise the temperature of 1.5 g of aluminum at 45°C, if the specific heat of aluminum is 0.75 J/g°C? Group of answer choices