How many calories are required to raise the temperature of 75g of water from 20 ˚C to 50˚ C?

A. 1.5x103 cal

B. 2250 cal

C. 2000 cal

D. 75.0 cal

An instrument used to measure and record ground movements during an earthquake is called a (n) a. seismograph. b. laser-ranging device. c. creep meter. d. moment magnitude scale.

Which of the following accurately describes the ph scale? a. the lower the ph is, the more basic the solution is. b. the greater the concentration of hydroxide ions, the higher the acidity is. c. the greater the ph is, the lower the acidity is. d.

A 52.0 mL volume of 0.25 M HBr is titrated with 0.50 M KOH. Calculate the pH after addition of 26.0 mL of KOH at 25 ∘C.

The following is an example of which type of chemical reaction? AgNO3 (aq) + NaCl (aq) - - > AgCl (s) + NaNO3 (aq) Single replacement Decomposition Double replacement Combustion

Which phrase best describes the bond in H2

Is this base a physical or chemical property?

Classify each of the following aqueous solutions as a nonelectrolyte, weak electrolyte, or strong electrolyte. a) LiClO4 b) HClO c) CH3CH2CH2OH d) HClO3 e) CuSO4 f) C12H22O11

Give examples of temporaty physical change

Which of these is a source of sediment? A. Fragments of other rocks B. Chemicals and Minerals dissolve in water C. Sea shells D. All of the above

Which resonance forms of silicon dioxide contribute the most to the actual bonding?