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3 years ago

1. The process of photosynthesis requires as an energy source.

Chemistry

2 answers:

Ymorist [56]3 years ago

7 0

Answer:

The energy source for photosynthesis is the sun!

Explanation:

I hope this helped

Ilia_Sergeevich [38]3 years ago

6 0

Answer:

Sun

Explanation:

It needs the sun for the energy source or else it will not make photosynthesis!

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A scientist measures the standard enthalpy change for the following reaction to be -17.2 kJ : Ca(OH)2(aq) 2 HCl(aq)CaCl2(s)

elixir [45]

Answer: $\Delta H^{0}=-173.72$ kJ/mol

Explanation: Enthalpy Change is the amount of energy in a reaction - absorption or release - at a constant pressure. So, Standard Enthalpy of Formation is how much energy is necessary to form a substance.

The standard enthalpy of formation of HCl is calculated as:

$\Delta ^{0}=\Sigma H_{products}-\Sigma H_{reactants}$

$Ca(OH)_{2}_{(aq)}+2HCl_{(aq)}$ → $CaCl_{2}_{(s)}+2H_{2}O_{(l)}$

Standard Enthalpy of formation for the other compounds are:

Calcium Hydroxide: $\Delta H^{0}=$ -1002.82 kJ/mol

Calcium chloride: $\Delta H^{0}=$ -795.8 kJ/mol

Water: $\Delta H^{0}=$ -285.83 kJ/mol

Enthalpy is given per mol, which means we have to multiply by the mols in the balanced equation.

Calculating:

$-17.2=[-795.8+2(285.85)]-[-1002.82+2\Delta H]$

$-17.2=-1367.46+1002.82-2\Delta H$

$2\Delta H=17.2-364.64$

$\Delta H=-173.72$

So, the standard enthalpy of formation of HCl is -173.72 kJ/mol

8 0

2 years ago

Which statement best describes the characteristics of white light?

netineya [11]

Answer:

i believe its B

6 0

3 years ago

how can knowledge of percent composition help you as a consumer ? how can you promote responsible consumerism ?

Nonamiya [84]

Answer:

it is a nice question....my mind tells me that the first is it use me as a good vibes and can use to anything the second i will do my best too absorbe it.

Explanation:

Hope this help...

8 0

2 years ago

Match the vocabulary word to its definition.

hoa [83]

Answer:

Nucleus - The central part of the atom containing protons and neutrons.

Electron - A positively charged particle located in the nucleus of an atom.

Proton - A positively charged particle located in the nucleus of an atom.

Electron Cloud - The area of the at surrounding the nucleus where electrons can be found.

Neutron - a negatively charged particle that orbits the nucleus of an atom.