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Natali5045456 [20]
3 years ago
8

Delta College Public Radio broadcasts on a frequency of 90.1 megahertz (MHz). (Mega = million). What is the wavelength of the De

lta College radio waves?
Chemistry
1 answer:
Anettt [7]3 years ago
7 0

Answer:

3.23m

Explanation:

Using the formula, λ = v/f, the wavelength can be calculated

In λ = v/f

λ = wavelength (m)

v = speed of light (3 × 10^8m/s)

f = frequency (Hz)

Since frequency (f) is 90.1 megahertz (MHz) i.e. 90.1 × 10^6 Hz

9.01 × 10^7Hz

λ = v/f

λ = 3 × 10^8 ÷ 9.01 × 10^7

λ = 0.3229 × 10^(8-7)

λ = 0.3229 × 10¹

λ = 3.23m

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Answer is: 9623.85 kJ of heat is <span>transferred from iron ingot.
</span>m(Fe) = 24.7 kg · 1000 g/kg = 24700 g; mass of iron ingot.
C = 0.4494 J/g°C; t<span>he specific heat of iron
</span>ΔT = 880°C - 13°C; temperature <span>difference.</span>
ΔT = 867°C.
Q = m·C·ΔT.
Q = 24700 g · 0.4494 J/g°C ·867°C.
Q = 9623856.06 J ÷ 1000J/kJ.
Q = 9623.85 kJ.
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Write the balanced net ionic equation for the reactions that occur when the given aqueous solutions are mixed. Include the physi
Anestetic [448]

Answer:

a. 2 H⁺ (aq) + 2 OH⁻ (aq) → 2H₂O(l)

b. Pb²⁺(aq) + 2I⁻(aq) → PbI₂(s)

Explanation:

First of all, we must determine if the reactants produce precipitates:

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B. Pb(NO₃)₂, KI

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Acid + Base → Water and Salt

The net ionic equation shows, that water is produced

We dissociate the compounds:

HNO₃  →  H⁺(aq)  +  NO₃⁻(aq)

Ca(OH)₂(aq) → Ca²⁺(aq) + 2OH⁻(aq)

Ionic complete equation:

2H⁺(aq) + 2NO₃⁻(aq)  +  Ca²⁺(aq) + 2OH⁻(aq) → Ca²⁺(aq) + 2NO₃⁻(aq) + H₂O(l)

Net ionic equation:   2 H⁺ (aq) + 2 OH⁻ (aq) → H₂O(l)

B. Pb(NO₃)₂, KI

We dissociate: Pb(NO₃)₂ (aq) →  Pb²⁺(aq) + 2NO₃⁻(aq)

KI(aq) →  K⁺(aq) + I⁻(aq)

Salts from nitrate are soluble but, when the iodide reacts, it can make a lead iodide precipitate

Ionic complete equation:

Pb²⁺(aq) + 2NO₃⁻(aq)  +  K⁺(aq) + 2I⁻(aq) → K⁺(aq) + 2NO₃⁻(aq) +PbI₂(s)

Net ionic equation: Pb²⁺(aq) + 2I⁻(aq) → PbI₂(s)

We cancel the repeated ions

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3 years ago
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Answer:

a is a physical changes

b is physical changes

c is a Chemical change

d is a physical changes

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