Which of these are the correct base pairs of DNA?

A. adenine and uracil

B. cytosine and guanine

C. cytosine adenine

D. thymine and guanine

The difference in potential between two electrodes which cause electric current to flow is called

What's the atomic number for tin?

When are drops of indicator most likely added to the Erlenmeyer flask? A. when preparing the burette B. when filling the pipette with acid C. when recording the initial burette volume D. when preparing to measure pH change

How many Valence electrons does Li have?

Which of these is a conversion from chemical energy to mechanical energy? A. A dark light bulb starting to glow B. A ball rolling down a hill C. A person lifting a weight D. A potato being heated in an oven

Why is oil unable to dissolve well in water? Water is polar and oil is nonpolar, which means they have no attraction for each other. Oil molecules are too large to fit between the closely spaced water molecules in the liquid state.

The fertilizer ammonium sulfate is prepared by the reaction between ammonia and sulfuric acid. How many kg of ammonia are needed to produce 1x10^5 kg of (NH4) 2SO4?

The conversion of chemical energy to mechanical energy is best described by which example? A. sunlight warming the ground B. electricity boiling water C. fuel being combusted to power a rocket

he density of solid aluminum is 2.70. If a 1g peice of aluminum is dropped in a cup of water, it will sink to the bottomfloat to the tophover in the middle. (The density of water is 1.0

Match the action to the effect on the equilibrium position for the reaction N2 (g) + 3H2 (g) ⇌ 2NH3 (g). Match Term Definition Increasing the pressure A) Shift to the left Removing hydrogen gas B) No effect Adding a catalyst C) Shift to the right