An element's atomic number is 81. How many protons would an atom of this element have? protons

is the direct transfer of heat between objects that touch. * Conduction radiation or convection

A scientist heats a sealed flexible container full of helium gas. What will most likely happen to the container as the gas absorbs heat

The following list contains some common polyatomic ions. Using the charge on these ions and the idea of valence, predict the formulas for the compound formed from the following: nitrate NO3-1 phosphate PO4-3 sulfate SO4-2 acetate C2H3O2-1 ammonium

When water evaporates what does it become?

Many plants, such as the potato plant, avoid insect predation by producing highly toxic sap. However, the potato bug, unlike most insects, has adapted to the toxins and can still eat the potato plant.

Internal respiration is the transfer of oxygen and carbon dioxide from the lungs to the tissue cells of the body. True or False

Which element is a metalloid? 1. Al 2. Ar 3. As 4. Aa

You move a 25N object 4 meters. Find the work you did

What is the relationship between matter and elements

Which of these would be an appropriate way to describe the concentration of orange candies? Check all that apply the number of orange candies divided by total number of candies the mass of orange candies divided by total mass of candies the volume