Which of the following statements correctly describe a photon? Select all that apply.

1) A high-frequency photon has low energy.

2) All photons have the same amount of energy

3) Matter cannot absorb or emit a fraction of a photon.

4) A photon is a particle of electromagnetic radiation.

Which best describes why nh4+ can form an ionic bond with cl-?

What is the correct term for living the most sustainable life you can within your current circumstances?

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.