What is the correct coefficients to balance the equation

SiO2 + HF - SiF4 + H2O

2 3 4 5

What are the similarities and differences between the bohr model of the atom and the quantum mechanical model of the atom?

When iridium-192 is used in cancer treatment, a small cylindrical piece of 192ir, 0.6 mm in diameter and 3.5 mm long, is surgically inserted into the tumor. if the density of iridium is 22.42 g/cm3, how many iridium atoms are present in the sample?

How many liters of hydrogen gas are formed from the complete reaction of 1.04 mol of C? Assume that the hydrogen gas is collected at a pressure of 1.0 atm and temperature of 316 K.

If 0.015 g of thyroid extract contains 25 mcg of thyroxine, how much thyroxine is contained in 15 mg of thyroid extract?

In what places you can find H particle?

Neutrons have. a. negative b. positive c. no charge d. nucleus

A method of farming that disturbs the soil and its plant cover as the responsible is called

Which of these would have a frequency greater than an X-ray A UV ray B violet light C microwave D gamma ray

What is true about exothermic reactions? A. More heat is given off than is put into the reaction. B Energy from an outside source is continuously being added. C. The reaction container always feels cold. D.

What are the three fundamentals particles of an atom