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Chemistry
Chemistry
High School
A student performs the following experiment.Step 1: she pours a colorless solution into a beaker that contains another colorless liquid. Yellow particles appear in the liquid.Step 2: she lets the yellow particles settle in the beaker and then separates the colorless liquid by decantstion. What most likely occurred in the beaker?
Chemistry
High School
Eva buys a package of food, and the nutrition label says that one serving is equal to 36 grams and has 110 Calories. However, the box is printed with a label that says 0.150 pounds. If Eva eats the whole package, how many Calories will she have consumed?
Chemistry
College
The density of ice is 0.917 g/cm3. What volume of ice does 52.75 g occupy?
Chemistry
High School
Why do nuclear fusions release energy?
Chemistry
High School
how many valence electrons are in the element gallium? explain how you determined the number.
Chemistry
College
An atomic model shows 19 protons, 20 neutrons, and 19 electrons. What is the mass number of the atom?
Chemistry
College
Chlorine could combine with _ to gain the extra electron it needs to stabilize its outer shell outer shell.A. heliumB. sulfurC. hydrogenD. none of these
Chemistry
College
I have a buddy who recycles electronics, and isolates metals from the connector pins electrical boards. He isolates gold, for example, and purifies it the best he can, then sells it along with his other scrap metal. This last go around he was able to isolate 3.00 g of Au with a process he claims results in a 80.0% yield. If he is correct, what was his theoretical yield
Chemistry
College
A peregrine falcon dives 176 meters through the air in 8 seconds. Itsaverage speed during the dive is 22 m/s. *
Chemistry
High School
If Argon has a mass number of 40 and an atomic number of 18, how many electrons does aneutral atom contain?A.40B.20C.22D.18
Chemistry
High School
In cooking or preparing food and drink, when have you observed solubility in action?
Chemistry
High School
6) A giraffe walked 1 mile in 15 minutes. Find the unit rate. O A. 1 mi/15 min O B. 15 mi/min O C. 0.06 milmin 0 D. 2 mi/30 min
Chemistry
College
What is the mass of 87.94 mL of ethanol, which has a density of 0.79 g/mL?
Chemistry
College
Which of the alkyne addition reactions below involve(s) an enol intermediate?1) halogenation. 2) hydrogen in the presence of a metal catalyst. 3) hydroboration/oxidation. 4) none of the above.
Chemistry
College
Be sure to answer all parts. Calculate the mass of each product formed when 70.76 g of diborane (B2H6) reacts with excess water: B2H6(g) + H2O(l) H3BO3(s) + H2(g) [unbalanced] Mass of H3BO3: g Mass of H2: g
Chemistry
High School
A rod of iron of uniform density has a thickness such that a one-inch-long segment of it weighs 3.88 ounces. Given that there are 0.035273 ounces in a gram and 2.54 centimeters in an inch, how many grams would a 14.79 cm length of the same iron rod weigh?
Chemistry
High School
Question 2 of 10Which of these is not an example of how engineering has affected society?O A. The seven-mile bridge that spans across the Gulf of Mexico toconnect two cities of the Florida KeysO B. The Hoover Dam, which was built to prevent floods, provideirrigation, and produce hydroelectric powerO c. The use of piers and beams used to build a strong foundation fora houseD. Our understanding of how cancer cells grow and spread
Chemistry
High School
1. The term _________refers to the chemical potential of hydrogen.
Chemistry
High School
The gas carbon dioxide is a pure substance. Which of the following is true about carbon dioxide?
Chemistry
High School
How many significant figures are in 0.0810300600 kg
Chemistry
High School
What kind of questions CANNOT be answered by chemistry? If someone could help me out I would really appreciate it! Thank you!
Chemistry
College
Which of the reactions are spontaneous (favorable)?A. 2Mg(s) + O2(g) rightarrow 2MgO (s) delta G = - 1137 kJ / mol B. NH3(g) + HCl(g ) rightarrow NH4Cl(s) delta G = - 91.1 kJ / mol C. AgCl(s) rightarrow Ag+ (aq) + Cl-[aq) delta G = 55.6 kJ / mol D. 2H2(g) + O2(g) rightarrow 2H2O(g) delta G= 456 kJ / mol E. C(s) + H2O(t) rightarrow CO(g) + H2(g) delta G = 90.8 kJ / mol F. CH4(g) + 2O2(g) rightarrow CO2(g) + 2H2O(t) delta G = -820 kJ / molA. Reaction A.B. Reaction B.C. Reaction C.D. Reaction D.E. Reaction E.F. Reaction F.
Chemistry
High School
Why are models and a common set of units important for scientists?
Chemistry
High School
How many sig figs are there?4000.
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