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marta [7]
3 years ago
5

An atom has 8 protons, 8 neutrons and 9 electrons. is thus a cation, anion, or neutral atom?​

Chemistry
1 answer:
Black_prince [1.1K]3 years ago
7 0

Answer:

It is an <u>Anion</u> because there are more electrons than protons making it negative

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Please ignore my answers because they are wrong.
earnstyle [38]

Answer:

The wavelength of the radio wave is 3.003 m.

The energy of the radio wave is 6.6194\times 10^{-26} J.

Explanation:

Frequency of the radio waves, ν = 99.9 MHz = 99.9\times 10^6 Hz

Wavelength and frequency are related to each other by realtion:

\lambda =\frac{c}{\nu }

\lambda = Wavelength of the wave

c = speed of the light

ν = Frequency of the wave

\lambda =\frac{3\times 10^8 m/s}{99.9\times 10^6 s^{-1}}=3.003 m

The wavelength of the radio wave is 3.003 m.

The energy of the electromagnetic wave is given by Planck's equation:

E=h\times \nu

h = Planck's constant = 6.626\times 10^{-34} Js

The energy of the radio wave with 99.9 MHz frequency will be:

E=6.626\times 10^{-34} Js\times 99.9\times 10^6 s^{-1}

E = 6.6194\times 10^{-26} J

The energy of the radio wave is 6.6194\times 10^{-26} J.

4 0
3 years ago
Chemical Equations :p
Nata [24]

Explanation:

  1. 4NH₃ (g) + 5O₂ (g) → 4NO (g) + 6H₂O (g)
  2. Ba(ClO₃)₂ (s) → BaCl₂ (s) + 3O₂ (g)
  3. 2Al (s) + 3Zn(NO₃)₂ (aq.) → 3Zn (s) + 2Al(NO₃)₃ (aq.)
  4. 2C₈H₁₈ (g) + 25O₂ (g) → 16CO₂ (g) + 18H₂O (g)
6 0
3 years ago
Calculate how many grams of oxygen form when each quantity of reactant completely reacts.. . 2HgO-----&gt;2Hg+O2
goblinko [34]
<span>6.96g HgO
hope it helps.
</span>
3 0
3 years ago
Limestone is made of calcium carbonate, CaCO3. Would you use an acid or a base to test a rock sample to determine whether it con
mote1985 [20]

Answer:We will use an acid to test whether sample contains calcium carbonate or not.

Explanation:

Calcium carbonate reacts with acids to give off carbon-dioxide gas ,water and calcium chloride. it is a salt of strong base calcium hydroxide and weak acid carbonic acid.

CaCO_3+2HCl\rightarrow CO_2+H_2O+CaCl_2

Evolution of carbon-dioxide on the reaction is also termed as effervescence.

If the sample contains the calcium carbonate strong effervesces will be observed and if not no effervescence will be observed.

We will use an acid to test whether sample contains calcium carbonate or not.

6 0
4 years ago
Read 2 more answers
How many moles of H2 are in a flask with a volume of 2500 mL at a pressure of 30.0 kPa and a temperature of 27oC?
quester [9]

Answer:

0.0300 moles of H₂

Explanation:

The original equation is PV = nRT. We need to change this to show moles (n).

n = \frac{PV}{RT}

It's important to convert your values to match the constant (r) in terms of units.

30.0 kPa = 0.296 atm

2500 mL = 2.50 L

27 °C = 300 K

Now, plug those values in to solve:

n = \frac{(0.296)(2.50)}{(0.0821)(300)}    -  for the sake of keeping the problem clean, I didn't include the units but you should just to make sure everything cancels out :)

Finally, you are left with n = 0.0300 moles of H₂

4 0
3 years ago
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