Which of the following rocks is formed by cooling lava?

obsidian

limestone

sandstone

marble

Write yes if the proper safety procedures are being followed and no if they are not. Then give a reason for your answer. Bubba cannot find matches to light his Bunsen burner.

2. Approximately how much salt can 100g of water hold at room temperature (25°C)

Examine the general structure of a molecule. C is bonded to R to the left, C O O H above right, H right, and N H 2 below left.

6. Identify the type of reaction shown by this chemical equation: 2A1 + Cl2 → 2AICI

Which does not contain a lens? A. A camera B. An eye C. Binoculars D. A mirror

Why is water (H2O) considered the "universal solvent"?

Which notations represent hydrogen isotopes?

Which of the following statements is true? Question 5 options: Chemical reaction rates vary with the conditions of the reaction, but nuclear decay rates do not.

2 human activities that contribute to runoff into water systems

Which of the following is an example of geographic isolation? A. a population of salmon dies out because they cannot find food. B. a zebra with a long mane moves into a population of zebras with short manes. C.