Many elements that are essential for life, including nitrogen, oxygen, and carbon, are part of what classification?

A. Metalloids

B. metals

C. noble gases

D. nonmetals

Elena weighed out 50 grams of salt. She dissolved the salt in 285 grams of water. After she added salt the water had 335 grams of weight. How did the addition of the salt affect the final mass and volume of the mixture?

What role did gravity play in the formation of our solar system?

A 0.100 m solution of which one of the following solutes will have the lowest vapor pressure? Which will have have the highest vapor pressure? A) KClO4 B) Ca (ClO4) 2 C) Al (ClO4) 3 D) Sucrose E) NaCl

A scientist measures the rate of a reaction between two liquids. Then he performs the reaction again, adding solid manganese. The reaction takes place more quickly the second time. The mass of the manganese decreased by 0.

Give chemical tests to distinguish between saturated and unsaturated compound

Cuál es número primo más pequeño entre 3,1,2,4

The Earth's biosphere is consists of

49. Which of the following statements regarding chemical equilibrium is true? a. Equilibrium is shown with a single arrow and/or an equal sign. b. A system at equilibrium maintains the concentrations of all reactants/products over time. c.

According to the food web. which of the following would be considered secondary consumers? Plants Grasshoppers Wolves Mushrooms

Could the concentration of reactants ever be equal to the concentration of products for a reaction at equilibrium? Explain why or why not.