All the following are signs of a chemical reaction, except

A. a change in color or odor.

B. a release of gas.

C. a change of state.

D. a change in energy.

Where is the mass of a black hole located

How many pairs of electrons are shared between the nitrogen atoms in a molecule of N2?

Calculate the energy absorbed when 6.20 g of aluminum is heated from 10.0°C to 65.0°C if the specific heat of aluminum is 0.900 J/g°C

What is the total number of moles (n) of electrons exchanged between the oxidizing agent and the reducing agent in the overall redox equation: 5 Ag (aq) + Mn2 (aq) + 4H20 () 5Ag (s) + MnO4 (aq) + 8H' (aq) a. 1 b. 2 c. 3 d. 5 ( e.?

Which of the following items are true of early nuclear science? (Multiple choice) •The first nucleus split was uranium-235. •The first nuclear reactions were done in the 1880's. •Albert Einstein himself caused the first nuclear reaction.

Draw every stereoisomer for 1,2-difluoro-1,2-dimethylcyclopentane. use wedge-and-dash bonds for the substituent groups, and be sure that they are drawn on the outside of the ring, adjacent to each other.

Suppose an ice cube weighing 36.0 g at a temperature of 10°C is placed in 360 g water at a temperature of 20°C. Calculate the temperature after thermal equilibrium is reached, assuming no heat loss to the surroundings.

Why can't all the mixtures be classified as solutions? A. Not all mixtures are heterogeneous B. Not all mixtures are homogeneous C. Not all mixtures have solutes and solvents D. Mixtures are made of only one substance.

Which of the following is a homogeneous mixture? A) Molten ironB) Stainless steelC) Trail mixD) Water

State the general relationship between temperature of the water and the amount of the salt that will dissolve in the water