Which of these is a pure substance?

a penny

sugar

ocean water

iced tea

A macromolecule made up of mainly carbon and hydrogen atoms that is primarily used for energy storage and in cell membranes.

A volume of 10.0 L of gas at a temperature of 85°C is cooled to a temperature of 5°C at constant pressure. What is the new volume of the gas?

Magda has the two magnets shown below what will happen if magda tries to push the north poles of the two magnets toward one another

1. A debit balance is a normal balance for which type of account A. Accounts payable B. Revenue C. Accounts receivable D. Owner's capital

Which Domains would you find single cell organisms

John dalton said that all atoms are identical in size and mass. explain why this is incorrect.

Complete each question by choosing or typing in the best answer. Time (seconds) Wavelength (nm) 0.1 2 0.2 2.5 0.3 3 0.4 3.5 0.5 4 0.6 4.5 Nina's measurements, shown in the table here, BEST represent a wave with A) decreasing frequency.

Suggest a mechanism that is consistent with a second order rate law

5. The element copper has naturally occurring isotopes with mass numbers of 63 and 65. The relative abundance and atomie masses are 69.2% and 30.8% respectively. Calculate the average atomic mass of copper,

Determine the hydroxide ion concentration in a solution that is 0.018 m naoh.