Recent activity by RainaBrandt4

1 answer 34 views

Calculate the standard enthalpy change for the following reaction at 25°C given the enthalpies of formation (in kJ/mol) of the compounds involved:CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l)Hf(CaCO3) = -1206.9 kJ/molHf(CaCl2) = -795.8 kJ/molHf(CO2) = -393.5 kJ/molHf(H2O) = -285.8 kJ/molHf(HCl) = -92.31 kJ/mol

answered 2 days ago in Chemical thermodynamics

1 answer 63 views

What is the effect of adding titanium to an aluminum alloy and how does it improve its properties for use in aerospace applications?

asked 6 days ago in Materials Chemistry

1 answer 51 views

What is the concentration of copper ions (Cu2+) in a sample solution if the absorbance of the solution at a wavelength of 550 nm is 0.45 and the path length of the sample cell is 1 cm? Given that the molar absorptivity of Cu2+ at this wavelength is 1.5 × 10^4 L mol^-1 cm^-1.

asked 6 days ago in Analytical Chemistry

1 answer 23 views

According to the social comparison theory, why do people compare themselves to others?

answered Jan 20 in Psychology

1 answer 5 views

According to the selective attention model, what is the cocktail party phenomenon?

answered Jan 20 in Psychology

1 answer 47 views

What factors can lead to the bystander effect?

answered Jan 17 in Psychology

1 answer 15 views

What is the difference between allostatic load and wear and tear theories of aging?

answered Jan 17 in Psychology

1 answer 39 views

According to the self-discrepancy theory, what is the relationship between self-discrepancies and anxiety?

asked Jan 17 in Psychology

1 answer 16 views

How can the ecological systems theory be evaluated?

asked Jan 16 in Psychology

1 answer 18 views

Who developed the dual process model of grief?

answered Jan 15 in Psychology

1 answer 24 views

Who developed the Social Model of Disability?

answered Jan 15 in Psychology

1 answer 16 views

How does Vygotsky's sociocultural theory differ from Piaget's theory of cognitive development?

asked Jan 14 in Psychology

1 answer 22 views

What type of mass movement is a sudden movement of large blocks of rock and soil down a slope?

asked Jan 8 in Science

1 answer 36 views

What is the basic chemical building block of matter; it is the simplest chemical substance?

asked Jan 6 in Science

1 answer 42 views

The size of the solute particles determines the rate of what?

answered Jan 2 in Science

1 answer 25 views

Speed takes distance and what else into account?

asked Dec 31, 2024 in Science

1 answer 20 views

Name the missing call of biochemical compound: carbohydrates, proteins, nucleic acids.

asked Dec 31, 2024 in Science

1 answer 21 views

In order to survive and maintain what state, an organism must quickly adapt to changing environmental conditions?

asked Dec 31, 2024 in Science

1 answer 39 views

Duplicated chromosomes are composed of two sister what?

answered Dec 30, 2024 in Science

1 answer 53 views

Bread has little holes in it from carbon dioxide produced by what?

asked Dec 30, 2024 in Science

...