Why do some objects such as windows and doors close in the winter but can be harder to close in the summer?

An electromagnetic wave has a frequency of 6.00x10^8 Hz. What is the wavelength?

If starch, glucose and NaCl are soaked in the dialysis tubing, will there be a difference between the beginning and after 15minutes?

Which one of the following is a combustion reaction?

What is the relative acidity of tomato juice (pH 4) and milk (pH 6) ?

What is the ph of a solution when the number of h + ions equals the number of oh - ions in the liquid?

How much MnO2 (s) should be added to excess HCl (aq) to obtain 295 mL of Cl2 (g) at 25 °C and 735 Torr?

Why do people describe water as a universal solvent

What is litmus paper used for? To indicate if all the reactants have been used up to determine if a chemical reaction has occurred to determine pH to detect the presence of water

You open your lemonade stand with 100 lemons, 5 bags of sugar containing 6 cups each, and 10 gallons of water (16 cups per gallon). Which statement is NOT true about the production of lemonade in your stand?

For the complete combustion of 5.6dm3 of a gaseuos hydrocarbon CxHy. 28.0dm3 of oxygen gas were used, 16.8dm3 of CO2 gas and 18.0gof liquid water were produced all gases measurement were made at stp. Determine the chemical formula of the hydrocarbon