The paleontologist estimates based on ratio samples of carbon-14 to nitrogen-14 from the animal’s bones that about 5 half-lives have elapsed since this animal died. What is the approximate age of the remains?

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

1. true or false: minerals are inorganic. true false 2. inorganic means that something has never been found alive 3. halite is another name for and is a mineral with a cubic crystal pattern. table salt rock salt

Find the enthalpy of neutralization of hcl and naoh. 87 cm3 of 1.6 mol dm-3 hydrochloric acid was neutralized by 87 cm3 of 1.6 mol dm-3 naoh. the temperature rose from 298 k to 317.4 k. the specific heat capacity is the same as water, 4.18 j/k g. a. -101.37 kj b. 7055 kj c. 10,1365 kj