Consider the law of conservation of mass. in the reaction how much o2 will you need for every h2s?

a. 1 mol

c. 3 mol

b. 2 mol

d. 4 mol

Soils that allow water to pass through them faster are more

A natural disaster caused an ecosystem to experience a significant drop in species richness. What can you conclude about the ecosystem? Evenness changed from high to low. Evenness changed from low to high.

Most metals are NOT a. ductile. b. good conductors of heat and electricity. c. liquid at room temperature. d. malleable.

What elements start with the letter T (periodic table)

Sodium carbonate is often used in certain candies to create fizzy bubbles when solid weak acids in the candy are dissolved with saliva. Explain the fizzing effect.

Why is it important for an art conservation scientists to study the properties of a painting before it is repaired

How many different kinds of atoms occur naturally on earth? Why do you think so

Can a particle be a single atom? can a particle be a molecule?

Which is one way that in advance and biotechnology companies unintended consequence is that harm the environment? a. genetically modified plants require less water to grow b. patient using insulin pumps live longer than those without the pumps c.

A 27.3 g marble sliding to the right at 21.0 cm/s overtakes and collides with a 11.7 g marble moving in the same direction at 12.6 cm/s. After the collision, the 11.7 g marble moves to the right at 23.7 cm/s. Find the velocity of the 27.