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Bezzdna [24]
4 years ago
5

The elements in group 2 all have _ valence electrons. A.2 4 6 8

Chemistry
2 answers:
Vlada [557]4 years ago
5 0

Answer:

2 valence electrons

Explanation:

JulijaS [17]4 years ago
4 0

Answer:

2 valence electrons,

Explanation:

For example magnesium Mg.

Mg readily loses  the 2 valance electrons to form Mg2+ which combines , for example, with chlorine to form the ionic  compound MgCl2.

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What could I use for 3 examples of chemical exchanges (preferably ones I could do with easily obtained chemicals)?
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8 0
3 years ago
what is the heat of a reaction, in joules, with a total reaction mixture volume of 67.9 ml if the reaction causes a temperature
Ahat [919]

The heat of reaction is  1.8 KJ. A calorimeter is a device used in calorimetry, a procedure for calculating heat capacity and measuring the heat of chemical processes or other physical changes.

<h3>How to calculate calorimeter?</h3>
  • A calorimeter is a device used in calorimetry, a procedure for calculating heat capacity and measuring the heat of chemical processes or other physical changes.
  • Among the most popular kinds are differential scanning calorimeters, isothermal micro calorimeters, titration calorimeters, and accelerated rate calorimeters.
  • Calorimeter, a tool for estimating a material's heat capacity and measuring the heat produced during a mechanical, electrical, or chemical reaction. bomb thermometer.

Volume of water = 67.9 mL

Since the density of water is 1.00 g/mL

Density = mass/volume

Mass of water = Density × volume

Mass of water =  1 g/mL × 67.9 mL

Mass of water = 67.9g or 0.0679 Kg

Temperature change =  6.5 oC

Specific heat capacity of water= 4.184 J/Kg

From;

H = mcθ

m = mass of water

c = heat capacity of water

θ = temperature rise

Substituting values;

H = 0.0679 Kg × 4.184 J/Kg × 6.5 oC

H = 1.8 KJ

To learn more about calorimeter refer to:

brainly.com/question/1407669

#SPJ4

3 0
1 year ago
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