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3 years ago

Please help this affects my grade a lot and im confused

Chemistry

1 answer:

IgorC [24]3 years ago

3 0

1 ) Cobalt(II) nitrate react with nitrate zinc(II) to produce cobalt(III)-zinc oxide, nitrogen dioxide and oxygen

2Co(NO3)2 + Zn(NO3)2 → Co2ZnO4 + 6NO2 + O2

2) Calcium hydroxide react with phosphoric acid to produce calcium, hydrogen phosphate and water

Ca(OH)2 + H3PO4 → CaHPO4 + 2H2O

3) Copper(II) dichromate will react with Iron(III) arsenate to form Copper(II) Arsenate and Iron(III) dichromate

3Cr2CuO7 + 2AsFeO4 → Cu3(AsO4)2 + Fe2(Cr2O7)3

Reaction Type : Double Displacement

4) aluminium hydroxide and hydrochloric acid react to form aluminium chloride and water

Al(OH)3 + 3HCl → AlCl3 + 3H2O

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How many moles of atoms are there in 27g of aluminium

Marrrta [24]

We know that the molar mass of Al is 27 g/mol.

27 g Al* (1 mol Al/ 27 g Al)= 1 mol Al.

The final answer is 1 mol Al~

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4 years ago

physics During exercise, a person may give off 753,480 J of heat in 30 minutes by evaporation of water from the skin. How much w

Tju [1.3M]

Answer : The amount of water lost was, 333.4 grams.

Explanation : Given,

Heat released = 753480 J

Formula used :

$Q=mL$

where,

Q = heat released = 753480 J

m = mass = ?

L = latent heat vaporization of water = $2260J/g$

Now put all the given values in the above formula, we get:

$753480J=m\times (2260J/g)$

$m=333.4g$

Thus, the amount of water lost was, 333.4 grams.

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3 years ago

Electromagnetic radiation with wavelength of 745 nm appears as red lighting to human eye. the energy of the photon is this light

trapecia [35]

Answer:The energy of the photon is this light is $2.66\times 10^{-19} Joules$ .

Explanation:

Wavelength of the electromagnetic radiation = 745 nm = $7.45\times 10^{-7} m$

$1m =1\times 10^{-9}nm$

Energy of the photon will be given by Plank's equation:

$E=\frac{hc}{\lambda }$

$E=\frac{6.626\times 10^{-34} J s\times 3\times 10^8 m/s}{7.45\times 10^{-7} m}$

$E=2.66\times 10^{-19} Joules$

The energy of the photon is this light is $2.66\times 10^{-19} Joules$ .

4 0

4 years ago

Read 2 more answers

Is it correct ?!???!);$);

ValentinkaMS [17]

Answer:

None of the above

Explanation:

process of elimination i guess, also delta E measures the amount of change in visual perception of two colors, so it probably wont mean w (work).

then again i may be wrong-

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3 years ago

How many moles of O are in Calcium hydroxide - Ca(OH)2?

Scrat [10]

It appears to be only 2

4 0

3 years ago