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Stels [109]
3 years ago
12

Which of the following parts of the electromagnetic spectrum have longerwavelengths than those witnessed in the visible spectrum

? 
       A. Gamma rays   B. Infrared   C. Cosmic waves   D. X-rays
Chemistry
2 answers:
Bumek [7]3 years ago
6 0

Penn Foster Students: Infrared

Vikentia [17]3 years ago
3 0
Infrared radiation is the only one with wavelengths longer than the wavelengths of visible light. X-rays and gamma rays are known to be shorter than visible wavelengths, and cosmic waves are only high energy particles. I hope this helped. And sorry about the late answer...
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Which is a heterogeneous mixture a jar of nuts
pogonyaev

Answer:

a party mix:-) it would be a jar of cashews, peanuts, almonds, ettc.

Explanation:

if you can separate the nuts, it is heterogenous

6 0
3 years ago
2. The reaction of zinc with nitric acid was carried out in a calorimeter. This reaction caused the temperature
snow_lady [41]

We want to solve Q = mcΔT for the liquid water; its change in temperature will tell us the amount of thermal energy that flowed out of the reaction. The specific heat, c, of water is 4.184 J/g °C.

Q = (72.0 g)(4.184 J/g °C)(100 °C - 25 °C) = 22593.6 J

Q ≈ 2.26 × 10⁴ J or 22.6 kJ (three significant figures).

3 0
3 years ago
Calcium carbonate decomposes into calcium oxide and carbon dioxide when heated. Calculate the mass of carbon dioxide released wh
erastovalidia [21]
<h2>Answer: 131.9 g</h2>

<h3>Explanation:</h3>

<u>Write a Balanced Equation for the decomposition</u>

CaCO₃     →     CaO    +    CO₂

<u></u>

<u>Find Moles of CO₂ Produced</u>

Since the mole ratio of  CaCO₃  to CO₂ is 1 to 1,

the moles of CaCO₃ = moles of CO₂

moles of CaCO₃   = mass ÷ molar mass

                             = 300 g ÷ 100.087 g/mol

                             = 2.997 moles

∴ moles of CO₂ = 2.997 moles

<u>Determine Mass of CO₂</u>

Mass = moles × molar mass

         = 2.997 mol × 44.01 g/mol

         = 131.9 g

<u></u>

<h3>∴ when 300 g of calcium carbonate is decomposed, it produces 131.9 g of carbon dioxide.</h3>
6 0
3 years ago
According to VSEPR theory, the molecule PF6- has how many regions of electron density around the central atom (how many electron
anygoal [31]

Answer : The electronic geometry and the molecular geometry of the molecule will be octahedral.

Explanation :

Formula used  :

\text{Number of electron pair}=\frac{1}{2}[V+N-C+A]

where,

V = number of valence electrons present in central atom

N = number of monovalent atoms bonded to central atom

C = charge of cation

A = charge of anion

The given molecule is, PF_6^-

\text{Number of electrons}=\frac{1}{2}\times [5+6+1]=6

The number of electron pair are 6 that means the hybridization will be sp^3d^2 and the electronic geometry and the molecular geometry of the molecule will be octahedral.

4 0
3 years ago
If a neutral atom of boron (B) contains 5 protons, 5 electrons and 6 neutrons, what is the mass number of this atom? (2 points)
Shkiper50 [21]
I believe the answer is 11, its been awhile since i was in science
6 0
3 years ago
Read 2 more answers
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