Why do roller coasters designers include a second hill on the ride

What is the best description of the role of decomposers in th carbon cycle

A sample weighing 3.00 g of a compound that contains only C, H, and O is completely burned in air to form 4.30g of CO2 and 2.35g of H2O. What is the empirical formula of this compound?

If a particular ore contains 58.3 % calcium phosphate, what minimum mass of the ore must be processed to obtain 1.00 kg of phosphorus?

You have ice cubes in your freezer at home. The ice cubes melt into water. This type of change is called a ... O a. nuclear change O b. physical change O c. chemical change

Which process is a chemical change? 1. freezing of liquid water to solid ice 2. condensation of gaseous steam to liquid water 3. boiling of liquid water to gaseous steam 4. decomposing of water to hydrogen gas and oxygen gas

How many protons does one atom of sulfur have

Which shows the electron configuration for zinc (Zn) ? [Kr]5s24d10 [Kr]5s24d6 [Ar]4s23d9 [Ar]4s23d10

What is the oxidation number of chromium in the ionic compound ammonium dichromate (nh4) 2cr2o7?

Draw an ecosystem with 10 biotic and 5 abiotic factor

Which organism is responsible for cleanup in this ecosystem? coyote vulture prairie dog grasshopper or prairie grass