Which of the following reactions shows a chemical change producing a gas? A. 2AgNO3(aq) + CaBr2(aq) + 2AgBr(s) + Ca(NO3)2(aq)
B. H2(g) + O2(g) → H20(1)
C. 2CH2OH() + 302(g) → 2002(g) + 4H20()
D. NaCl(s) → NaCl(aq)

what is the general relationship between a galaxy's distance from earth and its speed?

the answer is:

the farther away a galaxy is from us, the faster it is moving away from us.

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."