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3 years ago

Solid lithium chloride decomposes into chlorine gas and solid lithium. Write a balanced equation.

1 answer:

3 0

<span>Lithium chloride is LiCl (because the valence of lithium is +1 and the valence of chlorine is -1). So the chemical equation is: Li Cl(s) ----> Li(s) + Cl2 (g). To balance the equation you need to multilply both Li Cl (s) and Li(s) by two, and then you finally get the balanced equation: 2 LiCl ---> 2 Li(s) + Cl2(g). Note that the number 2 to the right of Cl is a subscript.</span>

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If 30.0 g absorbs 255 J of heat, how much does the temperature of the water change? Would the temperature be increasing or decre

Nutka1998 [239]

<h3>Answer:</h3>

Change in temperature = 2.03°C, the temperature is increasing

<h3>Explanation:</h3>

To calculate the quantity of heat absorbed or released by a substance we multiply mass of the substance by it's specific heat capacity and the temperature change.
Therefore, Quantity of heat, Q = mass × specific heat × change in temperature

In this case;

Mass of water = 30.0 g

Quantity of heat absorbed = 255 J

Specific heat capacity of water = 4.186 J/g°C

Rearranging the formula, Δt = Q ÷ mc

Δt = 255 J ÷ (4.186 J/g°C×30.0 g )

= 2.03 °C

The temperature change is 2.03°C, the temperature is therefore increasing.

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3 years ago

Which substance can be broken down by chemical means

Maru [420]

Answer:

1. Ammonia

Step-by-step explanation:

Ammonia, NH₃, is a <em>compound</em> of nitrogen and hydrogen.

Thus, it can be broken down by chemical means into the <em>elements</em> nitrogen and hydrogen.

The other options are <em>wrong</em>, because Al, Sb, and Pb are elements. They cannot be broken down chemically into simpler substances.

4 0

3 years ago

Read 2 more answers

Use de Broglie's hypothesis to determine the speed of the electron in a hydrogen atom when in the n = 5 orbit, whose radius is 1

andriy [413]

Answer:

Velocity = 4.41×10⁵ m/s

Explanation:

The force of attraction between the nucleus and the electron is equal to the centrifugal force acting on the outermost electron due to circular rotation. It can be mathematically written as:

$\frac {K\times q^2}{r^2}=\frac {m\times v^2}{r}$

Where,

K is the Coulomb's constant having value 9×10⁹ N. m²/C²

q is the charge on the electron or the proton which is 1.6×10⁻¹⁹ C

r is the radius of the atom

m is the mass of the electron having value 9.1×10⁻³¹ Kg

v is the velocity of the electron.

The equation can be written to calculate the velocity as:

$v=\sqrt {\frac {K\times q^2}{m\times r}}$

Given that:

r = 1.3×10⁻⁹ m

So,

$v=\sqrt {\frac {9\times 10^9\times (1.6\times 10^{-19})^2}{9.1\times 10^{-31}\times 1.3\times 10^{-9}}}$

<u>Velocity = 4.41×10⁵ m/s</u>

4 0

3 years ago

Please help asap

Helen [10]

C. carbon
sodium is an
oxygen is o
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3 years ago

Which of the following statements are NOT true:(you can pick more then one)

Evgesh-ka [11]

The answer is B!!! Statement B is not true!

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3 years ago