What is the most expensive element?

A covalent bond in which electrons are shared unequally

At a pressure 42 kPa, the gas in a cylinder has a volume of 18 liters. Assuming temperature remains the same, if the volume of the gas is decreased to 2 liters, what is the new pressure

Two samples of gold that have different temperatures are placed in contact with one another. Heat will flow spontaneously from a sample of gold at 60°C to a sample of gold that has a temperature of (1) 50°C (3) 70°C (2) 60°C (4) 80°C

The example of the ancient fish called a coelacanth was used to show us that science is constantly seeking new A) evidence B) ideas C) creatures D) Scientists

Are the following materials atoms, molecules, or both? A. Carbon B. Water C. Carbon dioxide D. Nitrogen

Which statement is true for a pure compound but NOT true for a pure element?

Which one is uncelluar and which is multicelluar? crab or pond organism

An atom of lithium loses an electron. What is the effect of this event? Group of answer choices The atom of a different element is formed. The atom of lithium acquires no charge. The atom of lithium becomes a positively charged ion.

Water interacts with polar substances like - OH groups but not with non-polar substances like methyl (-CH3) or ethyl groups (-CH2). Using this information, select the molecules that will easily dissolve in water based on polarity not on size.

Which of the following statements is not considered weather? The wind is blowing 20 miles per hour right now in Kansas. It is raining in Seattle. It is usually humid in Florida. It is snowing in Colorado.