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inn [45]
3 years ago
5

Which of the following is an example of a compound?

Chemistry
1 answer:
VladimirAG [237]3 years ago
3 0

Answer:

H2O is a compound because its a main constitute of earths hydrosphere

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What do the objects in motion have in common ​
Alona [7]

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All objects in motion do posses kinetic energy.

Explanation:

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How many pi bonds are in the oxalate ion (C2O42-)?
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Answer:there are 13

Explanation:

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Explain why magnesium and aluminium react in a similar way?
postnew [5]
Because magnesium loses its electrons easily than aluminum
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n a coffee cup calorimeter, 100.0 mL of 1.0M NaOH and 100.0 mL of 1.0M HCl are mixed. Both solutions were originally at 24.6 deg
RoseWind [281]

Answer:

Explanation:

mass of the solution = volume x density = 200 x 1 = 200 gm

heat absorbed = m x s x Δ t , s is specific heat , Δt is rise in temperature

= 200 x 4.18 x ( 31.3 - 24.6 )

= 5601 J .

This is the enthalpy change required.

3 0
3 years ago
What is the frequency of radiation whose wavelength is 2.51 x 10 -7m?​
hodyreva [135]

The frequency of radiation : 1.2 x 10¹⁵ Hz

<h3>Further explanation </h3>

Radiation energy is absorbed by photons

The energy in one photon can be formulated as

\large{\boxed{\bold{E\:=\:h\:.\:f}}}

Where

h = Planck's constant (6,626.10⁻³⁴ Js)

f = Frequency of electromagnetic waves

<h3>f = c / λ </h3>

c = speed of light

= 3.10⁸  m/s

λ = wavelength

Wavelength-λ is 2.51 x 10⁻⁷m

The frequency :

\tt f=\dfrac{3.10^8}{2.51\times 10^{-7}}=1.2\times 10^{15}

8 0
3 years ago
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