Which of the following statements is true?

Only some organs contain cells.

All cells contain at least one tissue.

Organs are made up of cells and tissues.

Tissues are made up of organs and cells.

An unknown gas effuses 1.66 times more rapidly than CO2. What is the molar mass of the unknown gas, given that the molar mass of CO2 is 44 grams?

You have 5.67g of N2 and 2.34g of O2

The mass number of an element is equal to a. the total number of electrons. b. the sum of the protons and neutrons. c. less than twice the atomic number. d. a constant number for the lighter elements.

Where does the blood move next?

If a chemist wishes to dilute a 1.000 x 103 mg/l stock solution to prepare 5.000 x 102 ml of a working standard that has a concentration of 6.250 mg/l, what volume of the 1.000 x 103 mg/l standard solution is needed?

When metals react with nonmetals, an ionic compound generally results. what is the predicted general formula?

Why could the Bohr model not predict line spectra for atoms other than hydrogen?

Cryolite, Na3AlF6 (s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. Balance the equation. 1.) Balance the equation - AlO3 (s) + NaOH (l) + HF (g) - ->Na3AlF6+H2O (g) 2.) If 17.5 kilograms of Al2O3 (s), 51.

The volume, in liters, of 538 g of CO2

What are two types of cold air masses that influence the weather in North America? Name them and describe their humidity.