A student notices dark clouds in the sky and that the playground is wet the student reasons that it rained which scientific skill describes the students reasoning

A. classifying

B. observing

C. inferring

D. predicting

State 3 evidences that the particles of substances are in continuous motion

What is the atomic number of the two isotopes of nitrogen? -5 -6 -7 -8 -9

Brian is riding his skateboard to his friend's house. Brian is pushing on the ground with his foot to move himself and the skateboard forward. Which energy is transformed into mechanical energy? A. Radiant energy B. Chemical energy C. Sound energy D.

Imagine that you mixed 25 mL of water at 0 C and 25 mL of water at 50 C. What is the final temperature of the water, how do you know? What is the ▵T for the cold water? How much heat energy transferred to the cold water?

How many molecules are contained in 0.500 moles of hydrogen gas? A. 1.20 x 1024 molecules B. 6.02 x 10-23 molecules C. 3.01 x 10-23 molecules D. 3.01 x 1023 molecules

In this assignment, you will write and balance a chemical equation. Then, you will use a table of enthalpy values to calculate the energy change in the reaction. Next, you will create a model of the energy change in the reaction.

Lead (ii) carbonate decomposes to give lead (ii) oxide and carbon dioxide: pbco3 (s) ? pbo (s) + co2 (g) how many grams of lead (ii) oxide will be produced by the decomposition of 2.50 g of lead (ii) carbonate?

What is the difference expressed in kilograms between the mass of proton and the mass of electon?

A molecule from a new organism contains adenine, cytosine, guanine, and thymine. What molecules is being looked at?

In what pH range does phenol red change from yellow to pink