Needed for most chemical reactions and makes up of 70% of cells.

A. Water

B. Air

C. Food

D. Living space

E. Carbohydrates

All the following are steps included in linking amino acids to form chains except A. removing the hydroxyl part of the amino group. B. using a peptide bond to connect the amino acids. C. removing a hydrogen from the amino group. D. forming water.

The Barton Springs salamander lives only at the spring outflows of Barton Springs near Austin, Texas. They are often found under rocks or among gravel in water several inches to fifteen feet deep.

Which of the following is an example of how a scientist might use a model? A. a wrench is used to tighten a nut onto a piece of wood B. marbles placed onto a hollow sphere are used to describe protons in a nucleus C.

Try using Zn (solid) with Cu (NO3) 2 in one cell and Cu (s) with Zn (NO3) 2 solution in another cell. Note down the voltage value. Explain what you are seeing for voltage value and use redox reaction to justify the process.

Magnetism easily separates what mixture? A). Sand and glass B). Sand and iron C). Sand and clay D). Sand and aluminum

The balanced chemical equation for the combustion of propane is C3H8 (g) + 5O2 (g) →3CO2 (g) + 4H2O (g) C3 H 8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (g) Which statement is correct about the complete combustion of 3.00 mole of propane, C3H8? a. 12.

Selena is growing geraniums outdoors in a pot. During the day, the temperature in her area averages 22°C (72°F). At night, the temperature has been dropping to around 13°C (55°F). What advice would you give to Selena and why?

How many carbons are in a molecule of hexane?

How does th composition of a mixture of hydrogen and oxygen differ from the composition of a compound containing hydrogen and oxygen?

You are asked to prepare 500 mL 0.250 M acetate buffer at pH 5.00 using only pure acetic acid (MW=60.05 g/mol, pKa=4.76), 3.00 M NaOH, and water. Answer the questions regarding the preparation of the buffer. 1.