How many moles of ethyl alcohol, C2H6O, are in a 18.0 g sample?

Which animal group actually saw a drop in the number of endangered and threatened species between 1995 and 2005? a Fish b. Reptiles c. Birds d. Mammals

Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to its position in the modern periodic table and how valency of an element is calculated on the basis of its atomic

What is the job of a scientist? A. To write laws based on his or her knowledge. O B. To ask and answer scientific questions. C. To answer ethical questions. O D. To ignore facts that do not support his or her theory.

Why does fire burn wood

A bar of soap measures 8 cm by 5 cm by 2 cm. Its mass is 90g. Calculate its density and predict whether this soap will float.

Common properties of sodium, calcium, iron, and gold

The closeness of a measurement to its actual value is a measure of its A. usefulness. B. reproducibility. C. precision. D. accuracy.

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

The SI unit for current is: joules volts ohms amps

In chemical reactions, there is a conservation of what?