Which of the following measurements contains two significant figures? A. 0.00300 L B. 0.00303 L C. 0.00033 L D. 0.00330 L

To dazzle his students, Mr. Turner collected volumes of ammonia gas and carbon dioxide gas. As the two colorless gases were combined in a closed two-liter bottle with a small amount of ammonium hydroxide, the chemistry students watched in amazement

Which isotope has the greatest number of protons? A Pa-238 B U-240 C Np-238 D Pu-239

What carries electric current from the cell to the other components of a circuit.

Number the elements sodium, magnesium, and potassium in the predicted order of ionic radius from the largest (1) to the smallest (3). sodium magnesium potassium

How many protons are in nitrogen-15?

What mass (in mg) does 2.63 moles of nickel have? 3.56 * 105 mg 1.54 * 105 mg 2.23 * 104 mg 129 mg?

Given the propane molecule C3H8 (g) ! a) What is the balanced equation for the combustion of propane in O2? (20 pts.) b) What is the standard enthalpy change ΔH0 for the reaction at 25°C? (20 pts.

Which of the following happens during a chemical change? Check all of the boxes that apply. One atom or more changes into atoms of another element. New substances with different properties are formed. Solids, liquids, or gases may form.

Which has more inertia: a kilogram of cotton balls or a kilogram of gold?

Democritus who lived in greece during the fourth century b. c suggested that matter is made up of tiny particles that cannot be divided. what did he called them