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Allushta [10]
3 years ago
8

The alkali metal that is naturally radioactive is ________.

Chemistry
1 answer:
Irina18 [472]3 years ago
6 0
Answer:  "francium<span> (Fr) " .
__________________________________________________</span>
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when you draw a bow across a violin string which kind of wave is created in the air surrounding the string
Lilit [14]

Answer:

When the string on a violin vibrates, waves move in both directions along the string, interfering with each other. These waves are standing waves.

Explanation:

What are Standing Waves?

The Standing Waves are waves generated due to the vibrational frequency that produces reflected waves capable of interfering with the incident waves. 

8 0
2 years ago
How many forces act on each person? When they put there hands together or High five
EastWind [94]

Answer:

Left and right: two forces

Total: four forces

Explanation:

If it's just the forces that they are using it would be two the force of each person's hand on the other. However there is also gravity pulling down on their hand but they use another force to pull it up which you can call the normal force.

if this helped please hit the thanks button <3

6 0
3 years ago
Read 2 more answers
6 C(s) + 3 H2(g) → 2 C6H6(l) Δ H = 49 kJ<br><br> TRUE or FALSE
VMariaS [17]

Answer:

True => ΔH°f for C₆H₆ = 49 Kj/mole

Explanation:

See Thermodynamic Properties Table in appendix of most college level general chemistry texts. The values shown are for the standard heat of formation of substances at 25°C. The Standard Heat of Formation of a substance - by definition - is the amount of heat energy gained or lost on formation of the substance from its basic elements in their standard state. C₆H₆(l) is formed from Carbon and Hydrogen in their basic standard states. All elements in their basic standard states have ΔH°f values equal to zero Kj/mole.

7 0
3 years ago
What is the reactivity trend of halogens?
RSB [31]
Reactivity trends of halogen:

1) Melting point and boiling points increased down the
group

2) Colour becomes darker.
E.g. Fluorine (pale yellow)
Chlorine (yellowish-green)
Bromine (reddish-brown)
Iodine (purplish-black)
Astatine (black)

3) The reactivity decreases down the group.
Reactivity:
F > Cl > Br > I > At
3 0
3 years ago
How many moles of sodium hydrogen carbonate are present in 2.61 grams of this compound?
Sloan [31]

Molar mass of NaHCO_3

  • 23+1+12+3(16)
  • 36+48
  • 84g/mol

Now

\\ \sf\longrightarrow No\:of\:moles=\dfrac{Given\:mass}{Molar\:mass}

\\ \sf\longrightarrow No\:of\; moles=\dfrac{2.61}{84}

\\ \sf\longrightarrow No\:of\:moles=0.0312mol

7 0
2 years ago
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