a suspension the substances are mixed at a: Ophysical level O atomic level O both physical and chemical level

Balance each chemical equation. H2(g)+F2(g)→HF(g) Express your answer as a chemical equation. Identify all of the phases in your answer.

Can this be solved using conversion factors?

Is there a difference between the melting point and the freezing point of a pure substance in a given location?  Why or why not?

The solubility of KNO, is 155 g per 100.0 g of water at 75 °C and 38.0 g at 25 "C. What mass of KNO, will crystallize out of solution if exactly 225.0 g of its saturated solution at 75 °C is cooled to 25 °C? Round your answer to 3 significant digits. G

How many joules are in 3245 cal?

The freezing point of ethanol, C,H,OH, is -114 °C and its boiling point ОН is 78.4 °C. Given this information, which animation best depicts the particles in a sample of ethanol at 0°C? A B C

A student dissolves 13.7 g of potassium hydroxide KOH in 200. g of water in a well-insulated open cup. He then observes the temperature of the water rise from 22.0°C to 34.0°C over the course of 7.3 minutes. KOHs + K+aq -> OH−aq You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to the correct number of significant digits. Is this reaction exothermic, endothermic, or neither? If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the reaction enthalpy ΔHrxn per mole of KOH .

The minimum level of mercury levels in water considered safe is 1 part per billion (ppb) by weight. Ifyou did an analysis and found that the concentration was 0.59 parts per billion. What quantity of mercuryin grams was present in 8.52 L of the water, the density of which is 0.998 g/ml? (1 ppb Hg = 1 ng Hg per1 g water)

How many mL of ethanol is present in 1000mL apple wine with 10.5% by volume ethanol?