Which material best absorbs sound waves in a room?

a. heavy curtains

b. hardwood floors

c. brick walls

d. cement floors

The freezing and thawing action of water affects a rock by? A. Transforming the rock into igneous rock B. Chemically changing the rock C. Gradually breaking down the rock into smaller pieces D.

Hich element is likely to be the most brittle? a. selenium b. cobalt c. platinum d. zinc

Which statement describes the electron sea model for metallic bonding? -This model involves electrons held tightly between atoms. -This model explains all properties of metals. -This model involves electrons moving among bands of orbitals.

During the life cycle of a flowering plant, the bee is responsible for which process? A) digestion B) fertilization C) germination D) pollination

Directions: The solubility curve for several common salts is shown in the graph. Use the graph to answer any questions that follow. A KNO3 solution hits saturation when 75 g of salt have dissolved. At which temperature is the solution? A. 15°C B.

Molar heat of condensation/vaporization of energy definition chemistry

What do different rock textures of metamorphic rock reflect

Calculate the formula mass for each compound. a. NO2 b. C4H10 c. C6H12O6 60. Calculate the formula mass for each compound. a. MgBr2 b. HNO2 c. CBr4 d. Cr (NO3) 3

How many electrons will calcium gain or lose when it forms an ion?

Which statement describes thermal energy? the energy that is associated with electric fields the energy that is stored in chemical bonds the energy that is associated with the pull of gravity the energy that is associated with temperature