Recent activity by JohnettePass

1 answer 63 views

What is the concentration of iron (II) ions in a water sample, measured in mg/L, if the sample has an absorbance reading of 0.345 at a wavelength of 477 nm using a colorimeter and following the methodology of the 1,10-phenanthroline method?

answered 6 days ago in Analytical Chemistry

1 answer 43 views

Calculate the enthalpy change for the reaction of burning 1 mole of methane using Hess's Law, given the following information:1) Enthalpy of formation for methane = -74.8 kJ/mol2) Enthalpy of combustion for methane = -890.3 kJ/mol3) Enthalpy of formation for water = -285.8 kJ/mol4) Enthalpy of formation for carbon dioxide = -393.5 kJ/mol

asked Jan 23 in ThermoChemistry

1 answer 23 views

How does ecological systems theory contribute to our understanding of human diversity?

asked Jan 17 in Psychology

1 answer 44 views

What is the role of attachment in cognitive development?

answered Jan 17 in Psychology

1 answer 16 views

According to embodied cognition theory, what is the role of motor action in perception?

asked Jan 17 in Psychology

1 answer 36 views

What is the difference between the psychodynamic and the behaviourist approach?

answered Jan 15 in Psychology

1 answer 21 views

Compare and contrast arousal theory and drive reduction theory.

asked Jan 14 in Psychology

1 answer 23 views

Worms grow to adult size without going through what stage?

answered Jan 8 in Science

1 answer 41 views

What is the term for magma that erupts onto earth's surface?

answered Jan 7 in Science

1 answer 43 views

What is the cause of the “heartburn” that occurs when acidic digestive juices escape into the esophagus?

asked Jan 6 in Science

1 answer 10 views

What instrument has a resolution many times greater than a light microscope, and can be used to see the details on the outside of a cell?

asked Jan 6 in Science

1 answer 20 views

What "kind" of water may take longer to become contaminated than surface water, while the natural cleaning process may take longer?

asked Jan 2 in Science

1 answer 7 views

Video and audio signals are broadcast on these?

answered Jan 2 in Science

1 answer 37 views

What organ absorbs about 90 percent of the water you ingest?

answered Dec 28, 2024 in Science

...