What is the molar concentration of a solution made by dissolving S grams of CaCl_(2) (calcium chloride) in enough water to make 500 mLo solution? 3 signing answer, no unit
Which of the following diatomic molecules is joined by a double covalent bond? O_(2) Cl_(2) N_(2) H_(2)
A diatomic molecule with a triple covalent bond is __ O_(2) F_(2) N_(2) H_(2)
A molecule that has a single covalent bond is __ CO_(2) co Cl_(2) O_(2)
What THREE nonmetals can hydrogen form a hydrogen bond with? Nitrogen Sulfur Oxygen lodine Bromine
- Name each ester. (a) mathrm(CH)_(3)(mathrm(CH)_(2))_(4) mathrm(CO)_(2) mathrm(CH)_(3) (b)
A SDS sheet contains: Reactivity Boiling point of material Melting point of material All of the above
__ 35. The mass of a 1.0 L sample of a gas is 0.716 g at STP. What is the molar mass of the gas? __ 36. What is the density at STP of NO_(2) gas (molar mass=46.01g/mol) in grams per liter?
If 0.90 g of scandium reacts with 0.48 g of oxygen, what is the formula for the scandium oxide? What is the charge on the Scion?
13. How many moles are present in 17.4 g of lead? (Hint: use Moles=mass/molar mass) A. 8.50 B. 0.0085 C. 0.85 D. 0.085 D B A
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.
