What is true about AHmix for NaNØ3 compared with LiNØ3? Х ДНтіх NaNO3 is positive and larger in magnitude AHmix NaNO3 is positive and smaller in magnitude AHmix NaNO3 is negative and larger in magnitude 4) AHmix NaNO3 is negative and smaller in magnitude

What is the mass (in kg) of 6.89 × 10^25 molecules of carbon dioxide? Give the answer as a number. The units are understood to be kg.

Taking into account that the spheres represent atoms, indicate:a) if the represented systems correspond to mixtures or notb) if the substances are simple or compound.c) In what state of aggregation are they?

Every year Every second (1 year 365 days).

A student dissolves 106 g of compound Q in one liter of hot water. All of compound Q dissolves.  The student then cools the water to room temperature.  At room temperature, 52 g of compound Q dissolves in one liter of water.  How many grams of compound Q will recrystallize in the room temperature water? Include the unit in your answer.

Cl₂(g) + 2e Cr₂0 (aq) + 14 H(aq) + 6€¯ O2(g) +4 H(aq) + 4e¯ MnO2(s) + 4H(aq) + 2e¯ 10, (aq) +6H(aq) +5e¯ VO₂+ (aq) + 2H(aq) + e¯ Br₂(1) + 2e NO, (aq) +4 H(aq) + 3e¯ ClO2(g) + e 2 Cl(aq) Ag* (aq) + e Fe3+(aq) + e 2 Cr³+ (aq) + 7 H₂O(1) 1.36 1.33 2 H₂O(1) 1.23 Mn2+(aq) + 2 H₂O(1) 1.21 12(aq) + 3H2O(l) 1.20 VO²+(aq) + H₂O(1) 1.00 2 Br (aq) 1.09 NO(s) + 2 H2O(1) 0.96 CIO₂ (aq) 0.95 Ag(s) 0.80 Fe2+(aq) 0.77 What is the E° cell for the reaction Cr₂O²² + CIO₂ → Cr³+ + CIO₂? a. 2.28 V. b. -2.28 V. c. 0.38 V. d. -0.38 V.

Suppose you prepared a plot for this experiment and the equation of the trendline was y = 78.012x+0.01251  Based on this information, what would be the absorbance of the solution if the concentration is 0.009697 M? DO NOT include units in your answer.   Follow sig. fig. rules as you perform your calculations, but DO NOT round your answer until the very end of your calculation.  Credit will only be given for answers that have the correct value and significant figures.

(Incorrect) An impure sample of hydrocarbon having a total mass of 41.0 g undergoes combustion analysis to generate 82.6 g CO₂(g) and 16.9 g H₂O(g). Assuming that the impurities do not contain carbon or hydrogen, what percentage of the initial sample is the pure hydrocarbon? Provide the numerical value of your response in decimal notation rounded to 3 significant figures. You answered: 4.58 The correct answer is: 59.5%

Explain your rationale for using the summative assessment (below) from the lesson plan on mixing substances in a 5th-grade classroom based on the below standard and learning objective, including how you will use student outcomes to inform future instructional decisions.  Summative Assessment  Summative: Components of the Lab Report Purpose: The student should clearly state the purpose of the experiment, which is to determine whether the mixing of two or more substances results in new substances. Procedure: The student should describe the steps they took to conduct the experiment. This includes the substances they chose to mix and the safety equipment they used. Observations: The student should record any observable changes that occurred when the substances were mixed. This could include a color change, the formation of a precipitate, or a change in temperature. Conclusion: The student should state whether a new substance was formed based on their observations. They should also…

The observation of light during a reaction is usually associated with which of the following? A a chemical change B C D a physical change melting boiling