Recent activity by JensKaye7769

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How can X-ray fluorescence spectroscopy be used to accurately identify and quantify the presence of specific elements in a complex sample matrix such as soil or rock samples?

answered 6 days ago in Analytical Chemistry

1 answer 5 views

How can the presence of a specific compound in a given sample be identified using Raman spectroscopy and what are the necessary steps involved in sample preparation and analysis?

asked Jan 29 in Analytical Chemistry

1 answer 44 views

Calculate the enthalpy change of the reduction reaction of Fe3+ to Fe2+ when 1.44 g of Fe3+ ions are reduced using a standard hydrogen electrode (E° = 0.00 V) at 298 K. The balanced half-reaction equations are given below:Fe3+ + e- → Fe2+ ( E° = +0.77 V)H+ + e- → 1/2 H2(g) ( E° = 0.00 V)

answered Jan 23 in ThermoChemistry

1 answer 39 views

Calculate the energy required to break all the bonds in 1 mole of methane gas (CH4) at standard conditions, given that the bond energies of C-H and C-C bonds are 413 kJ/mol and 348 kJ/mol, respectively. Then, calculate the total energy released or absorbed during the combustion of 1 mole of methane gas with oxygen gas to form carbon dioxide gas and water vapor.

answered Jan 23 in Chemical reactions

1 answer 71 views

A chemistry student wants to analyze a sample of wastewater from a local factory. They want to know the concentration of the pollutants from the wastewater before releasing it into the environment. The sample is collected in a 500 mL container. After performing the required tests, the student determines that the total dissolved solids (TDS) in the sample are 750 mg/L, and the concentration of NaCl in the sample is 150 mg/L. Calculate the mass of TDS and NaCl in the sample.

asked Jan 22 in Analytical Chemistry

1 answer 48 views

According to Piaget, what is the formal operational stage of cognitive development?

asked Jan 20 in Psychology

1 answer 39 views

According to operant conditioning, what is the cause of phobias?

answered Jan 16 in Psychology

1 answer 40 views

What is the information processing theory of intelligence?

asked Jan 15 in Psychology

1 answer 23 views

What is presbycusis?

asked Jan 14 in Psychology

1 answer 58 views

What is the main difference between bottom-up and top-down processing?

asked Jan 14 in Psychology

1 answer 29 views

Which system transports oxygens to cells?

answered Jan 8 in Science

1 answer 29 views

Which continent is the only one that reptiles don't inhabit?

answered Jan 8 in Science

1 answer 23 views

What bodily substance is formed from cells, and in turn helps make up organs?

asked Jan 6 in Science

1 answer 29 views

What are the ends of long bones called?

asked Jan 3 in Science

1 answer 24 views

High decibel sounds can damage your?

answered Dec 30, 2024 in Science

1 answer 8 views

Graphite is a form of elemental carbon what is another form?

asked Dec 30, 2024 in Science

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