Why leather gets hardered after tanning

Where was cell theory discovered?

Muscle contraction is triggeredA) in response to an increase in the cytoplasmic Ca2+concentration. B) in response to a decrease in the cytoplasmic Ca2+concentration. C) in response to an increase in the cytoplasmic cAMP concentration.

Should the students dump the substance in the test tube in the sink after finishing the experiment? Explain.

At 300 k the pressure inside a gas filled container is 500 kPa if the pressure inside decreses to 100kpa but the volume remains the same what is the final temperature of the gas

At 25 °c, what is the hydroxide ion concentration, [oh-], in an aqueous solution with a hydrogen ion concentration of [h ] = 3.0 * 10-5 m?

If a sample of copper with a density of 8.90 g/cm3 displaces 13.0 mL of water when placed in a beaker, what is its mass? a 1.46 g b. 0.685 g c. 116 g

Which statement accurately describes the origin and expansion of the universe

Conversion. 5 km to inches

How many kilojouls are required at 0c to melt an ice cube with a mass of 25g

Which substance is the oxidizing agent in this reaction? 2CuO+C→2Cu+CO2 Express your answer as a chemical formula.