The colour imparted to a flame by calcium ion?

The density of h2 gas in a rigid container is 0.135 g/l at a given temperature. what is the pressure of hydrogen in the flask if it is heated to 201 °c?

Chloroform (CHCl3), an important solvent, is produced by a reaction between methane and chlorine. CH4 (g) + 3 Cl2 (g) CHCl3 (g) + 3 HCl (g) How many grams of CH4 is needed to produce 66.5 g CHCl3?

What only happens during a chemical reaction? A. Colors change. B. New substances are formed. C. Bubbles form. D. A solution is made.

A sample of C3H8 has 7.52*1024 H atoms. How many carbon atoms does the sample contain? What is the total mass of the sample?

A glass flask has a volume of 500 mL at a temperature of 20° C. The flask contains 492 mL of mercury at an equilibrium temperature of 20°C. The temperature is raised until the mercury reaches the 500 mL reference mark.

Describe three characteristics that trees used to build treehouses should have. why are these characteristics essential

Select the correct value for the indicated bond angle in each of the following compounds: O-S-O angle of SO2 F-B-F angle of BF3 Cl-S-Cl angle of SCI2 O-C-O angle of CO2 F-P-F angle of PF3 H-C-H angle of CH4

What is the shape of a molecule with a triple bond?

4FeS2 + 11O2 > 2Fe2O3 + 8SO2 Given 75.0 grams of iron (IV) sulfide, how many grams of sulfur dioxide are produced?

Cytotoxic t cells can attack target cells with which chemical weapons?