The half-life of radium-226 is 1600 years. How many grams of a 0.25 g sample will remain after 4800 years?

1. If a metal with a higher specific heat were used, would this raise or lower the final water temperature? Explain

A student isolated 15.6 g of product from a chemical reaction. She calculated that the reactions should have produced 18.4 g of product. What was the student's percent yield? A - 84.8% B - 15.2% C - 95.4% D - 45.9%

True or false? Some organisms consist of one single cell, while other organism are made of many cells

A piston in a heat engine does 500 joules of work, and 1,400 joules of heat are added to the system. Determine the change in internal energy and explain how this example demonstrates the conservation of energy.

Which would have the lowest input force? A short lever with a large fulcrum A long lever with the fulcrum as far as possible from the load A Short lever with the fulcrum as close as possible to the load A long lever with the fulcrum as close as

What type of chemical bond is formed between two atoms of bromine 1. Metallic 2. hydrogen 3. Ionic 4. covalent

Before oceanography was recognized as its own branch of science it was part of A. Physics B. Chemistry C. Geometry D. Natural science

For a chemical reaction to be spontaneous at all temperatures, which of the following conditions must be met? a. ΔS° > 0, ΔH° > 0 b. ΔS° > 0, ΔH° < 0 c. ΔS° < 0, ΔH° < 0 d. ΔS° 0 e.

What is a Binary Compound? Is it related to the Ionic and Molecular compounds? if so, how so?

Which answer correctly describes the difference between covalent and ionic bonds? A. ionic: transfer of protons covalent: transfer of electrons B. ionic: transfer of electrons covalent: transfer of protons C.