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.
Heterogeneous mixtures are observed to be uniform throughout. 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
Consider the reaction below between Chlorine gas and Aluminum: 3Cl_(2)(g)+2Al(s)- 2AlCl_(3)(s) 15 grams of Cl_(2) is reacted with 10 grams of Al. How many grams of AlCl_(3) will be produced?
A 2 mol sample of methyl bromide (CH_(3)Br) undergoes the phase change shown below. The enthalpy of vaporization and the enthalpy of fusion are also given. CH_(3)Br(s)arrow CH_(3)Br(I) Delta H_(vap)=23kJ/mol Delta H_(fus)=6.0kJ/mol The change in enthalpy is most nearly: -12kJ -46kJ +12kJ +46kJ
Elements that are all in the same horizontal line are said to be in periods. True False
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.
The following reaction is an example of a substitution reaction. 2Na+Cl_(2)arrow 2NaCl TRUE FALSE
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.
An ionic bond is most accurately described as forming through: ) The sharing of electron pairs between two nonmetal atoms. The transfer of electrons from one atom (typically a metal) to another atom (typically a nonmetal)resulting in oppositely charged ions. The delocalization of electrons among many metal atoms.
When you balance the Separate Water simulation how many individual oxygen atoms do you need on the products side to complete the balanced equation? 1 2 3 4
Determine which type of property each statement describes by typing "physical or "chemical" in the blank. Hydrogen is a colorless tasteless, and odorless gas. $\square $ Hydrogen is very combustible in the presence of oxygen. $\square $ Hydrogen is very reactive with most elements. $\square $ Hydrogen is the least dense of all elements. $\square $
Which of the following is an empirical formula? $C_{3}H_{6}$ $C_{3}H_{8}$ CH $C_{2}H_{4}$
Which of the following has the most mass per mole? Oxygen Nitrogen Carbon Potassium
What is the electron configuration for oxygen, O? $1s^{2}2s^{2}2p^{3}$ $1s^{2}2s^{2}2p^{6}3s^{2}$ $1s^{2}2s^{2}2p^{4}$ $1s^{2}2s^{2}2p^{6}3s^{2}$
Gasoline, paints, thinners solvents, natural gas acetylene are all examples of potential: A. Toxic hazards. B. Flammable hazards. C. Combustible hazards. D. All of the above. E. None of the above.
Trans fats and partially hydrogenated oils are the same thing. False True
Is this compound ionic or covalent? $NO_{2}$ ionic covalent
(b) $H_{3}C-CH-CH_{2}-CH_{2}-CH_{3}\\ H_{2}C-CH_{3}$ 2-Ethylpentane Spell out the full name of the compound. The correct name is $\square $
Question 2 (Multiple Choice Worln 2 Points) (05.01 LC) Which of the following groups have seven valence electrons and are very reactive? Column 1 alkali metals Column 2 alkaline earth metals Column 17 halogens Column 18 noble gases
