A radioactive isotope has a half-life of 2.5 years. Which fraction of the original mass remains unchanged after 10 years?

An atom can be described as a-the smallest particle that has all the characteristics of a compound b-the smallest particle that has all the characteristics of an element c-a charged particle that is similar to a molecule d-a charged particle that is

Explain the statement, "Is there life after hydration?"

Which of the following classes of organic compounds has C=C in it? A) alkene B) aldyhyde C) alkyne D) alkane

Can Neon form any compounds?

When would a measurement be both accurate and precise? (A) he measurement can be replicated (B) the measurement is around the accepted value (C) the measurement is close to the accepted value and can be reproduced (D) a reliable instrument was used

Heat is most closely related to ___ energy. A. Nuclear B. Electrical C. Thermal

How many moles are in 26.4 grams of lithium

What is the independent, dependent, control group and constant: A student wanted to test how the mass of a paper airplane affected the distance it would fly. Paper clips were added before each test flight.

Where are two places that scientists obtain scientific knowledge

Which of the following best describes what happens when an ionic bond forms? A) two atoms come together and share electrons in order to fill their octets. B) two atoms give up their electrons in order to form a bond.