A sample of water is heated from room temperature to just below the boiling point. The overall change in temperature is
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Chemistry
- Suppose that you are closing a cabin in the north woods for the winter and you do not want the water in the toilet tank to freeze. You know that the temperature might get as low as 30. C, and you want to protect about 4.0 L water in the toilet tank from freezing. Calculate the volume of ethylene glycol (density = 1.113 g/mL; molar mass = 62.1 g/mol) you should add to the 4.0 L water.arrow_forwardAssume that the radius of Earth is 6400 km, the crust is 50. km thick, the density of the crust is 3.5 g/cm3, and 25.7% of the crust is silicon by mass. Calculate the total mass of silicon in the crust of Earth.arrow_forwarddiagram b is correct, What procedures can be used to solve this problem? write down the plan for this new way to solve the problem. 1. first execute plan 1 to solve this problem. explain in every step. 2. solve the problem again - this time use the plan that you propose, plan 2. 3. finally, think about the way that you can use it to make sure that your answer makes sense. write your assessment.arrow_forward
- I need help with questions B and C.arrow_forward1. A candle is placed on one pan of a balance, and an equal weight is placed on the other pan. What would happen if you lit up the candle and waited for a while? Suppose the candle was placed in a large, sealed jar that allowed it to burn for several minutes before running out of oxygen. The candle and jar are balanced by an equal weight. In this situation, what would happen if you lit up the candle and waited?arrow_forward1. KO2 -readily reacts with moisture to produce oxygen gas, potassium hydroxide, and hydrogen peroxide. A. What is balanced chemical equation of this reaction B. What would be the pressure of oxygen gas stored at 20°C that would have the same density as the oxygen gas evolved from KO2. The density of KO2 at 20° C is 2.15 g/cm^ 3arrow_forward
- pour it 2. Still sleepy from a late night studying, you take the milk out of the refrigerator and pour it on your lemon juice to milk to make paneer (fresh cheese). As a group, craft a chemical explanation for the fact of coagulated milk onto your cereal. The last time you saw milk coagulate like that was when you added breakfast cereal. Unfortunately, by the time you notice the funny smell you have already poured clumps lemon juice to milk to make paneer (fresh cheese). As a group, craft a chemical explanation foea added that spoiled milk coagulates.arrow_forwardWhich of the following is the formation reaction for Na2CO3 (s)? A. 2 Na(s) + C(s, graphite) + 3 O(g) → Na2CO3(s) B. 4 Na(s) + 2 C(s, graphite) + 3 O2(g) → 2 Na2CO3(s) C. 2 Na(s) + C(s, graphite) + 1.5 O2(g) → Na2CO3(s) D. Na2(s) + C(s, graphite) + 1.5 O2(g) → Na2CO3(s) E. 2 Na(g) + C(g) + 1.5 O2(g) → Na2CO3(s)arrow_forward95. Balance the following equations representing combustion reactions: (+ OH 1684 + May not be copied, scanned, or duplicated, in whole or in part. (0)arrow_forward
- L 30arrow_forwardQ Sodium chloride (NaCl) was isolated from SiO2 and CaCO3 by dissolving it in distilled water. Calcium carbonate (CaCO3) is in fact slightly soluble in water (0.001 g/100 mL). What effect will this have on NaCl from the mixture: will the "isolated" mass be greater than, equal to, or less than that in the sample? Selected answer will be automatically saved. For keyboard navigation, press up/down arrow keys to select an answer. a b с Question 6 Greater than Equal to Less thanarrow_forwardPart A An iron ore sample contains Fe2 O3 together with other substances. Reaction of the ore with CO produces iron metal: Balance this equation. a Fe, O3 (s) + BCO(g) → y Fe(s) + 8 CO2 (g). You may want to reference (Pages 103 - 105) Section 3.6 while completing this problem. Express your answer as a balanced chemical equation. Identify all of the phases in your answer. ΑΣφ ? O A chemical reaction does not occur for this question. Submit Request Answer Part B Calculate the number of grams of CO2 formed when 0.310 kg of Fe2 O3 reacts. Express your answer in grams to three significant figures.arrow_forward
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