8. How many molecules are there in a 42.3 g sample of water, H_(2)O

1. If a solution has a H^+ concentration of 3.4times 10^-5 what is its pH? 2. What is the pOH in the above solution?

Identify the elements that are diatomic. I H Ne Se Rb Cu Eu F

When a molecule loses an electron in a chemical reaction, the molecule has been A) induced. B) reduced. C) oxidized. D) metabolized.

4. Calculate the hydroxide ion concentration and the pOH of the solution.

Nitrogen monoxide reacts with chlorine gas as follows: 2NO(g)+Cl_(2)(g)rightarrows 2NOCl(g) At 700 K. the equilibrium constant, K_(P) for this reaction is 0.26. Now, consider the following conditions at 700K:P(NO)=0.16atm,P(Cl_(2))=0.21atm and P(NOCl)=0.11atm Which of the following statements is true? A. The reaction proceeds forward towards the equilibrium B. The reaction proceeds in reverse towards the equilibrium C. The reaction is at equilibrium D. The rate of making products is faster than the rate of making reactants. E. Delta G=0

How many grams of sodium metal are needed to make 29.3 grams of sodium chloride? Given the reaction: 2Na+Cl_(2)arrow 2NaCl 46.0 23.0 not enough information 5.75 11.5

2. A student mixed 4.00 mL of 0.0120 M Pb(NO_(3))_(2) with 4.00 mL of 0.0300 M KI and 2.00 mL of 0.20MKNO_(3) and observed the formation of a yellow precipitate. (0.5pts) a. What is the molecular formula of the precipitate?

Write a balanced chemical equation based on the following description: solid cesium reacts with solid cesium nitrite to produce solid cesium oxide and nitrogen gas. Cs(s)+CsNO_(2)(s)arrow

3. If the pH of a calcium hydroxide solution is 11.64 and you have 2.55 L of solution, how many grams of calcium hydroxide are in the solution?

Hot Questions

Before you go, which type of molecule would you choose to be the anode in a lithium battery? a) The metal with the most negative potential b) It does not matter since lithium's potential is so negative c) The metal with the most positive potential d) Another lithium compound

Part I: Unit Conversions.Show all work (known and unknown, and dimensional analysis - including units! Write your answers in the boxes provided. Unit Test: Dimensional Analysis and Mole Convers 1. Find the number of minutes in 25 years, assuming that $1year=365days$ K:25 years 2. The driving distance from Spokane to Seattle is 479,000 meters. Convert this distance to miles given $1m=100cm,1in=2.54cm,12in=1ft,$ and $1mi=5280ft$ $\square $ Part II: Mole Conversions . Show all work (known and unknown, and dimensional analysis - including units! Write your answers in the boxes provided. 3. A sample contains $9.2\times 10^{22}$ atoms of beryllium (Be)How many moles is this? $\square $ 4. The formula for Aluminum Carbonate is $Al_{2}(CO_{3})_{3}$ What is the molar mass of aluminum carbonate? $\square $

The following reaction is an example of a substitution reaction. $2Na+Cl_{2}\rightarrow 2NaCl$ TRUE FALSE

Heterogeneous mixtures are observed to be uniform throughout. True False

What are some examples of foods that need an emulsifier mayonnaise chocolate ice-cream oil water various salad dressings.

27. The contents of a drum have not been identified. You notice crystalline material on top of the drum, you should treat the contents as: A. shock-sensitive waste. B. nearly empty. C. containing chlorinated solvent. D. containing caustic materials.

A weak acid is a dilute acid that is not very powerful. True False

What is a crucial aspect of chemical optimization? Adjusting team member speed Pre-treating the vehicle Using water reclamation tanks Ordering new equipment

Why is chemistry sometimes referred to as the "central science?" Because we need to know it to survive as a species. Because it is interconnected with many other STEM disciplines. Because it incorporates principles from math and physics. Because there are many subdisciplines of science that rely on chemistry.

Malia was able to make a paperclip float on the surface of water. What will most likely happen to the paperclip if a drop o dishwashing detergent is added near it? Soap is a surfactant that increases the intermolecular forces of water allowing the paperclip to continue to float. Soap makes the water less viscous making the paperclip sink. Soap is a surfactant that disrupts the intermolecular forces of water making the paperclip sink. Soap makes the water more viscous allowing the paperclip to continue to float.