Chemistry Answers

Is there a difference when the needle or metal clip is placed on the surface of distilled water and on the surface distilled water with dilute amounts of liquid detergent? Explain your observations in terms of the strength of IMFA present in each condition.

If the burette reading for NaOH was taken after rapid delivery of the titrant, what will be the effect

1. Using Hess’ Law and the following information calculate the heat of formation of _the plant hormone ethylene, C₂H₄ in the equation: 2 C(s) + 2 H₂(g) → C₂H₄(g)

Combination and oxygen produced carbon dioxide and water which is given by the chemical reaction formula C4H10+CO2>CO2+H20

thermochemical equation of One mole ammonium nitrate (NH4NO) dissolves in water to produce aqueous ammonium ions and nitrate ions accompanied by the absorption of 28.1kJ of heat.

   7.36 x 1024 free oxygen atoms how many moles?

7.36 x 1024 free oxygen atoms

Discuss the health property of tea in terms of inhibition of starch digestions. What chemical entities and enzymes are involved? What is the health benefit from such action?

A. Identify which between the two given molecules is a gas at room temperature

1. O2 and S

2. C2H8 and C5H12

B. Based on the intermolecular forces present, predict the relative boiling points of each of the substances below. Arrange each series of substances in order of increasing boiling point. State your reason for order you use. ( identify the forces and explain how they affect the boiling point.)

1. Dimethyl ether (CH3OCH3), ethanol(CH3CH2OH), and propane(CH3CH2CH3

2. Br2, Cl2, I2

3. F2, PCl3, OF2

Solution #1 is a 0.025 M solution of hypochlorous acid, HOCl (Ka = 3.0 × 10–8). Calculate each of the

following quantities for Solution #1.

(a) [H+] in Solution #1