During a laboratory activity, a student combined two solutions. In the laboratory report, the student wrote "A yellow color appeared." The

statement represents the student's recorded

(1) conclusion (3) hypothesis

(2) observation (4) inference

What is the hybridization of the central carbon of allene (1,2-propadiene) ?

Suppose a thermometer has marks at one-degree increments and the meniscus is half-way between the 28 and 29 degrees Celsius marks. We should properly report the temperature measurement as which of the following? A) 28°C B) 29°C C) 28.5°C D) 28.

Given that pH + pOH = 14, what is the pH of a solution if its pOH is 12.4?

Calculate the number of CC atoms in 0.183 molmol of CC. Express the number of atoms of carbon numerically.

Which of these statements are true? Select all that apply. The Hrxn for the reaction C (s) + O2 (g) CO2 (g) is the same as the Hf for CO2 (g). The Hrxn for the reaction Na (s) + Cl2 (g) 2NaCl (s) is the same as the Hf for NaCl (s).

What moves in or out of a substance during a change of state?

2.5 moles of sodium chloride is dissolved to make 0.050 liters of solution

2. The minimized structure of phenacetin is planar, and the chemical shifts of the aromatic protons in the NMR spectrum can be rationalized by electron delocalization.

Altering the pressure of a system can affect the rate of a chemical reaction. true false

What does ice cream melt on a hot day which type of thermal energy transfer does this melting represents