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1. Calcium carbonate and sand mixture with weight of 4 grams is reacted with excees of HCl results in the production of carbon dioxide then find out the percent of calcium carbonate in the original mixture?
2. observe and answer if an unknown compound is noticed to melt at the temperature of 111 degree Celsius with a gas evolution and solidify it, this compound doesn't melt until it reaches at 155 degree Celsius temperature then explain at what time melting of this compound takes place again?
Chemical Kinetics - Determine the time taken by a reactant to reach a particular concentration
How many mL Hydrochloric acid of 0.1 M must be added to 100 mL of a 0.2 M solution of tris base to form a buffer ( pH 7.8)?
Question enthalpy and entropy values are given and were asked to find boiling point of mercury
Determine the partial pressure. Calculate the total pressure and volume in liters at STP of Nitrogen, Helium and Neon mixture.
using a sample of river water sample analyzed for total inorganic carbon ,The river pH= 7.1 and an inorganic C concentration of 6.97 mg C/L.c
Using a sample of 0.0355 gram of an unknown molecular compound is dissolved in 1.000 g of liquid camphor at 200.0°C. Calculate the molar mass of the unknown compound if the camphor freezes at 157.7°C upon cooling.
This given reaction: 2 O3(g) -→ 3 O2(g) has an empirically determined rate law (with a single unimolecular event). Determine what is the observed rate If k =4.0 × 105s-1, [O2] = 0.2M and [O3] = 0.5 M?
Describe how this observation is consistent with the law of conservation of charge.
Find the volume of oxygen - What volume of oxygen is needed to completely combust 2.07 L of methane gas
What is the alkali-aggregate reaction? List some of the rock types that are vulnerable to attack by alkaline solutions. Discuss the effect of aggregate size on the phenomenon.
Given chemical reaction is used to produce electricity in lead storage battery that used in automobiles generally.
Understanding of chemistry basics - which of the following is not changed by the activity of an enzyme during a chemical reaction?
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