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3 years ago

Write a balanced chemical equation for the standard formation reaction of solid calcium hydroxide .

1 answer:

3 0

Calcium Hydroxide (Ca(OH)2) can actually be formed by the reaction of Calcium Oxide (CaO) with water (H2O). The complete balanced chemical reaction is:

CaO + H2O --> Ca(OH)2

The subscript 2 in (OH) means that there are 2 O and 2 H on the product side. Hence, the equation is balanced already.

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Using the table of average bond energies below, the delta h for the reaction is

Sindrei [870]

Using the table of average bond energies the delta h is the the delta h lol

3 0

4 years ago

Write the nuclear equation to describe the alpha decay of 243 95 Am

motikmotik

Answer:

Here's what I get.

Explanation:

Your unbalanced nuclear equation is:

$_{95}^{243}\text{Am} \longrightarrow \, _{x}^{y}\text{Z} +\, _{2}^{4}\text{He}$

The main point to remember in balancing nuclear equations is that the sums of the superscripts and the subscripts must be the same on each side of the equation.

Then

95 = x + 2, so x = 95 - 2 = 93

243 = y + 4, so y = 243 - 4 = 239

Element 93 is neptunium, so the nuclear equation becomes

$_{95}^{243}\text{Am} \longrightarrow \, _{93}^{239}\text{Np} + \, _{2}^{4}\text{He}$

7 0

3 years ago

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A(n) _______________ is a negatively charged ion

siniylev [52]

An anion is a negatively charged ion.

Hope this helps xox :)

3 0

3 years ago

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If the length, width, and height of a box are 10.00 cm, 7.25 cm and 3.00 cm, respectively, what is the volume of the box in unit

Blizzard [7]

Answer:

For a: The volume of the box is 217.5 mL

For b: The volume of the box is 0.2175 L

Explanation:

The box is a type of cuboid.

To calculate the volume of cuboid, we use the equation:

$V=lbh$

where,

V = volume of cuboid

l = length of cuboid = 10.00 cm

b = breadth of cuboid = 7.25 cm

h = height of cuboid = 3.00 cm

Putting values in above equation, we get:

$V=10.00\times 7.25\times 3.00=217.5cm^3$

For a:

To convert the volume of cuboid into milliliters, we use the conversion factor:

$1mL=1cm^3$

So,

$\Rightarrow 217.5cm^3\times (\frac{1mL}{1cm^3})\\\\\Rightarrow 217.5mL$

Hence, the volume of the box is 217.5 mL

For b:

To convert the volume of cuboid into liters, we use the conversion factor:

$1L=1000cm^3$

So,

$\Rightarrow 217.5cm^3\times (\frac{1L}{1000cm^3})\\\\\Rightarrow 0.2175L$

Hence, the volume of the box is 0.2175 L

3 0

4 years ago

How much energy, in joules, is released when 17 kilograms of granite is cooled from 45 C to 21 C?

Lostsunrise [7]

Answer is: D. 327,992.8 J.
m(granite) = 17 kg = 17000g.
ΔT(granite) = 21°C - 45°C = -24°C (-24K).
cp(granite) = 0,804 J/g·°C, specific heat capacity of granite.
Q = m(granite) · ΔT(granite) · cp(granite).
Q = 17000 g ·(-24°C)· 0,804 J/g·K.
Q = -327990 J.
The granite lost 327990 joules of energy.
Q - amount of energy gained or lost.

8 0

3 years ago

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