Solid copper(II) oxide reacts with hydrogen gas to produce copper metal and water. The correct chemical equation that describes this reaction is:

(SLO #2) Density is defined as the mass of a substance divided by it’s volume. You have a white crystalline solid that you need to determine the density of. To do this you weigh a graduated cylinder containing 8.5 cm3 of kerosene and find its mass to be 126.71 g. You then transfer a quantity of the crystalline solid to the cylinder containing the kerosene (ionic substances will not dissolve in kerosene). After adding the crystalline solid, you find that the volume of the liquid kerosene rose to 15.3 cm3 and that the combined mass of the cylinder, kerosene and sample was 145.53 g. What is the density of the crystalline solid?

Consider the following compounds when answering questions 43 – 46: (Let me know if the image does not load) What intermolecular force(s) can methanal (above on left) form?

(3 points) What are the coefficients of the balanced chemical equation for the reaction between methane (CH4) and oxygen gas (O2) reacting and producing methanol (CH3OH)? (You may want to write out the chemical equation yourself).

X and Y are two species, each consisting of one nucleus and a number of electrons. The two species are found to contain the same number of protons, the same number of electrons, and a different number of neutrons. Which of the following statements about X and Y is correct?

(SLO #3) Solve the equality (in case that photo does not load: P1V1/T1 = P2V2/T2)            for T2. 

(SLO #4) (3 points) Balance the following equation:     Al2S3             +      H2O      →     Al(OH)3           +        H2S

Orders at the Coffee Shop, Week 1 Size Number Ordered Small 87 Medium 135 Large 165 Extra Large 93 Total 480 How many degrees of freedom are there for this chi-square goodness of fit test? Enter the answer as a whole number.

(jsBv1v) Sex and Stance on Bill 2   Sex   Stance on Bill 2 Male Female Total Support 387 453 840 Oppose 132 109 241 Total 519 562 1081   Which is the most appropriate null hypothesis for a chi-square test of independence on these data?

Orders at the Coffee Shop, Week 1 Size Number Ordered Small 87 Medium 135 Large 165 Extra Large 93 Total 480 What is the expected frequency for large drink orders for this chi-square goodness of fit test?