What is the percent by mass of oxygen in carbon dioxide

Which tags do not depend on a silicon microchip and use plastic or conductive polymers instead of silicon-based microchips allowing them to be washed or exposed to water without damaging the chip?

How many moles of iron in a sample that contains 7.91 x 10^23 atoms of iron?

PH=-log[6.3*10-10M] What is the pH of the solution? What is the pOH of the solution?

Does a set mousetrap that snaps shut potential energy to kinetic energy

Determine whether the variable is qualitative or quantitative. grams of carbohydrates in a donut. grams of carbohydrates in a donut

Which cannot be separated into simpler substances? compound element solution mixture

What jobs involve chesmistry

Think about a neutral magnesium atom. Then think of a magnesium ion with a 2+charge. How are these two alike? How are they different? Be sure to use the terms proton, neutron, and electron in your answer.

What subatomic particle is specifically responsible for combining the atoms together to form a new substance?

A chemist reported that 100 gallons of a gas were available in a laboratory. Which property of the gas did the chemist report?