Give the formula for the following compound: Sulfur dioxide square
Give the name for the following compound: NaHSO_(3) square
Give the name for the following compound: HCl_((aq)) square
Give the name for the following compound: K_(2)Cr_(2)O_(7) square
Gamma hydroxybutyrate (GHB) has a fairly short half-life of about 1 hour. True False
A chemist weighed out 101. g of beryllium Calculate the number of moles of beryllium she weighed out. Be sure your answer has the correct number of significant digits. square
Which of the following describes a substance in the solid physical state? The substance compresses significantly. The substance has a variable volume. The substance has a variable shape. all of the above none of the above
Which of the following is an example of a physical change? changing color releasing heat forming an insoluble solid dissolving a substance none of the above
Which of the following processes produces a decrease in the entropy of the system? D dissolution of solid KCI in water D melting ice to form water D boiling water to form steam mixing of two gases into one container D freezing water to form ice
Only about 25% of useful energy is produced in combustion (cars) True False
Phosphorus reacts with iodine as shown in the chemical reaction below.What is the percent yield of the reaction if 28.2 g $Pl_{3}$ is obtained from the reaction of 48.0 g of 12 with excess phosphorus? $2P(s)+3I_{2}(s)\rightarrow 2PI_{3}(s)$ 51.7 g 51.48 51.5 g None of the above 51.98
Select the pair that has the larger atom or ion listed first. $Br^{-},Se^{2-}$ $S,S^{2-}$ $Cl,Cl^{-}$ $F^{-},Ne$ $P,P^{3-}$
What information do you need to look at on the SDS? There is 1 correct answer. Look at Section 2 - Hazards Look at Section 3 Composition / Information on Ingredients Look at Section 4 - First Aid Measures Look at Section 5 - Fire-Fighting Measures Look at Section 6 - Accidental Release Measures
Breaking bonds is hydrolysis. is dehydration synthesis. stores energy. is endergonic.
Which statements are true regarding reaction rates'[Select all that apply.] Larger activation energies are associated with faster reaction rates. Higher reactant concentrations are associated with faster reaction rates. Reducing the activation energy for a reaction increases its reaction rate. Reaction rates depend on how likely molecules are to collide in the correct orientation to react. Reactions that give off heat occur rapidly. Reactions that absorb heat occur rapidly. Large changes in enthalpy are associated with fast reaction rates. At high temperatures molecules are more likely to collide with enough energy to initiate a reaction. Two molecules must collide with one another to react.
If 5.00 g of gray iron powder reacts with 2.38 g of red phosphorus powder, what is the mass of the iron phosphide product? $\square $
How many oxygen molecules do we need to produce four molecules of water? a) 4 b) 2 C) 3 d) 1
6. How many hydrogen atoms are in the chemical formula $C_{6}H_{12}O_{6}$ o 6 24 18 12
What type of chemical reaction is illustrated in the following example? $FeBr_{3}(aq)+AgNO_{3}(aq)\rightarrow Fe(NO_{3})_{3}(aq)+AgBr(s)$ combination reaction decomposition reaction single-replacement reaction double-replacement reaction neutralization reaction
Foamers and defoamers work by affecting the __ of liquid/gas separation. Fill in the blank.
