Which of the following is NOT an appropriate way to handle hexavalent chromium? Roping off or isolating spills or other releases of chemicals to be cleaned up at a later date Swapping one type of steel for another Only eating, drinking, or smoking in designated areas Respiratory protection

Which of the following is NOT a hazard associated with aluminum? Aluminum increases UV radiation more than other metals Aluminum looks clean when it is not Aluminum does not change colors when it is heated Aluminum is highly magnetic

8. How many grams of HF are needed to react with 300 grams of sodium silicate? underline ( )Na_(2)SiO_(3)+underline ( )HFarrow underline ( )H_(2)SiF_(6)+underline ( )NaF+underline ( )H_(2)O

Determine how many atoms or moles are in problems (11-14) 11) How many atoms are in 4.5 moles of Carbon? 12) How many atoms are in 2.8 moles of Oxygen? 13) How many moles are in 2.2times 10^24 atoms of Hydrogen? 14) How many moles are in 6.4times 10^24 atoms of Calcium?

Acid-Base Reactions Try it Problems Complete and Balance the Following reactions and determine if the following Complete are strong acids, weak acids, strong bases, or weak bases. Assume the salts produced are aqueous (aq) unless noted with an (s) to denote the formation of a precipitate. underline ( )KOH(aq) +underline ( )HF(aq) arrow underline ( )(l)+underline ( )(aq) underline ( )NaOH(aq)+underline ( )CH_(3)COOHarrow underline ( )(I)+underline ( )(aq) underline ( )H_(2)SO_(4)(aq)+underline ( )LiOHarrow underline ( )(l)+underline ( )(aq) Challenge: underline ( )Ca(OH)_(2)arrow underline ( )(I)+underline ( )(s)

What is the molarity of a solution containing 5.0 moles of KC in 2.0 L of solution? A 2.0 M B 2.5 M C 1.0 M D 5.0 M

What is the charge of an ion with 26 protons, 28 neutrons and 27 electrons? +1 +2 -2 -1

What are the conjugate acid-base pairs for the reaction represented by the following equation? a. B and H_(2)O;BH+ and OH- b. B and BH+;H_(2)O and OH- c. B and OH-;H_(2)O and BH+ d. None of the above

Given 0.45 grams of N_(2) how many grams of NaN_(3) are needed? 2NaN_(3)... 2Na+3N_(2) 0.70 g NaN3 0.25 g NaN3 3.0 g NaN3

2Al+6HBrarrow 2AlBr_(3)+3H_(2) When 4.65 moles of Al reacts with 8.36 moles of HBr how many moles of H2 are formed? Moles H2 square Limiting Reactant square

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.