A certain radioactive element has a half-life of one hour. if you start with 1.0 gram of the element at noon, how much of the radioactive element will be left at 2 p. m.? 0.50 grams 0.25 grams 0.125 grams 0.0 grams

Three separate 3.5g blocks of al, cu, and fe at 25°c each absorb 0.505 kj of heat. which block reaches the highest temperature? the specific heats of al, cu, and fe are 0.900 j/g·°c, 0.385j/g·°c, and 0.444 j/g·°c, respectively.

Does CO2 contain molecules?

After a student makes a solution, its temperature rises. Which term describes this process? endothermic chemical reaction exothermic chemical reaction exothermic solution formation endothermic solution formation

Which is a product in the following chemical reaction? CH4 + 2O2 → CO2 + 2H2O

Substances A and B, initially at different temperatures, come in contact with each other and reach thermal equilibrium. The mass of substance A is twice the mass of substance B.

How do you use the periodic table to find the matter, number of subatomic particles, family name, reactivity, and number of valence electrons?

You see rainforests a is far as the eye can see It rains every day and the humidity is fiercel Where might you be? Polar climate Tropical climate Subtropical climate Temperate climate

What is the evaluation of 60.1 x - 9.2? (I pressed chemistry, but I ment to press mathematics, sorry!)

How can I calculate the percent concentration of solution? m solute = 15g m solution = 100g

Calculate the mass in grams of a single atom C¹²