When the following equation is balanced, the coefficient in front of HCl is: Ba (s) + HCl (aq) →BaCl2 (aq) + H2 (g)

Question 4 options:

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A 100.0 mL bubble of hot gases at 225 °C and 1.80 atm escapes from an active volcano, what is the new volume of the bubble outside the volcano where the temperature is - 25 °C and the pressure is 0.80 atm?

An element's atomic number is 81. How many protons would an atom of this element have? protons

In 1913, Henry Moseley discovered a way to calculate the atomic number for each element and it was determined to arrange the periodic table by atomic number and not atomic mass.

If a substance decreases in temperature from 270K to 220K, the kinetic energy of that substance increases.

New Pressure of gas when temp is 235 k

Which best explains how Dmitri Mendeleev organized elements in his periodic table? O A. Elements were ordered based on their discovery date. O B. Elements were ordered based on their economic value. O C.

The rocks and minerals of the Earth consist of compounds.

Do the number of protons in an atom of an element always equals its atomic weight.

Calculate the [oh-] in a solution with a ph of 12.52.

Which of the following months would be the darkest at the South Pole? January December August February