Look back at parts A and B to compare the properties of the unknown elements with the properties of the known

Name one manufactured device or natural phenomenon that emits electromagnetic radiation in each of the following wavelengths: ra

Bas_tet [7]

Radio - Radio station transmits radio wavelength which is received by the
Radio.

Microwaves - Microwave Oven to heat up foods. 

IR (infrared) - TV remote Control, to transmit IR light to a sensor in the TV so it can do some functions like increasing the volume, changing the channel etc. 

Visible light - Sunlight or Light Bulbs 

Ultraviolet - UV Lamps for sun tan, for detecting forged money 

X-rays - Chest X-ray machines, Backscatter Xray (body scanner in airport security)

Gamma rays - Gamma rays Medical Equipment which are used to kill cancer cells, to sterilize medical equipment

7 0

3 years ago

As we saw in section 4.3, nitric acid and hydrochloric acid are strong acids. write net ionic equations for the neutralization o

Kazeer [188]

First you write the "molecular" equation, then the ionic equation, and finally the net ionic equation.

Explanation:

You can read about these equations at

Here are the steps for your reaction.

1. Write the molecular equation

We write the equation as if all the reactants were molecules.

2HNO₃(aq) + Mg(OH)₂(s) → 2H₂O(l) + Mg(NO₃)₂(aq

2. Write the ionic equation

We write all the soluble strong electrolytes as ions. H₂O is a weak electrolyte, so we write it as a molecule. Mg(OH)₂ is insoluble, so we write it as a molecule as well.

2H⁺(aq) + 2NO₃⁻(aq) + Mg(OH)₂(s) → 2H₂O(l) + Mg²⁺(aq) + 2NO₃⁻(aq)

3. Write the net ionic equation

Here, we cancel all species that appear on both sides of the equation. We cancel the NO₃⁻ ions.

The net ionic equation is

2H⁺(aq) + Mg(OH)₂(s) → 2H₂O(l) + Mg²⁺(aq)

6 0

3 years ago

PD-99 has a half-life of 22.3 hours. How many grams of a 89.8 gram sample would have decayed after exactly three half-lives?

Solnce55 [7]

Answer:

78.875 g

Explanation: