Of the rock's original uranium-235 remains. how old is the rock

A. If you have a Periodic Table that is NOT color coded, describe where to look on the Periodic Table to find elements which have similar chemical properties. B. Explain why they have similar chemical properties. C.

What is the pressure in pascals if the pressure is equal to 380 torr

Engineers increase output in crop production by combining the strengths of two plants. This can be done by using one plant to pollinate a different plant so that their strengths are combined into a new plant. What is this technique called?

Which answer choice correctly names the element that Mendeleev predicted would be discovered and placed in the aluminum column? carbon (C) sodium (Na) helium (He) gallium (Ga)

Which group of elements are considered to be in the same family? A. helium, neon and argon B. potassium, calcium and scandium C. manganese, iron and cobalt D. hydrogen and helium

Which term refers to an electrochemical cell that produces an electric current? A) electrolyte B) voltaic cell C) electrolytic cell D) cathode

How can you determine the valence electrons in an electron configuration?

Methods used to reduce sulfur dioxide emissions from smokestacks are an attempt by humans to A lessen the amount of insecticides in the environment B eliminate diversity in wildlife C lessen the environmental impact of acid rain D use non chemical

What does 54 in mn-54 represent

Valerie wants to examine the properties of a thick liquid but is finding it difficult to pour the liquid into a beaker. She needs to finish her investigation before the end of class.