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3 years ago

8

PLEASE READ MARKING BRAINIEST

1 answer:

balandron [24]3 years ago

7 0

Answer:

MgF2 + Li2CO3 -> MgCO3 + 2LiF

It is important to balance chemical equations because there must be an equal number of atoms on both sides of the equation to follow the Law of the Conservation of Mass

Write down the element and each amount on each side of the equation

Then compare each side and add your coefficients so the amounts of each element are equal

Explanation:

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What can occur in physical change ?

Alexandra [31]

Within a physical change, an element can change forms, such as going from solid to a liquid through melting. Color change can also occur during a physical change. Physical changes are very different from chemical changes. In a chemical change the element itself changes into something else within a reaction, such as combustion (burning).

Hope this helped

5 0

3 years ago

The carbon cycle does not really involve matter. True False

stiks02 [169]

False everything involves matter

8 0

3 years ago

Read 2 more answers

Consider the following equilibrium: CO2(g) + C(graphite) 2CO(g); ΔH = 172.5 kJ The equilibrium constant for this reaction will

bezimeni [28]

Answer: Option (B) is the correct answer.

Explanation:

As the given reaction is as follows.

$CO_{2}(g) + C(graphite) \rightarrow 2CO(g)$

Equilibrium constant for this reaction will be as follows.

$K_{c} = \frac{[CO_{2}]}{[CO]^{2}}$

According to Le Chatelier's principle, when we increase the temperature then the equilibrium will shift towards the right hand side.

As a result, concentration of carbon dioxide will decrease whereas concentration of carbon monoxide will increase.

Thus, we can conclude that in the given reaction equilibrium constant for this reaction will decrease with increasing temperature.

8 0

3 years ago

Which two elements have the most similar chemical properties? 1. beryllium and magnesium 2. hydrogen and helium 3. phosphorus an

tatiyna

Phosphorus and sulphur is the answer

7 0

3 years ago

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An original sample of the radioisotope fluorine-21 had a mass of 80.0 milligrams. Only 20.0 milligrams of this original sample r

lyudmila [28]

<u>Answer:</u> The correct answer is Option 3.

<u>Explanation:</u>

All the radioisotope decay processes follow first order kinetics.

Rate law expression for first order kinetics is given by the equation:

$k=\frac{2.303}{t}\log\frac{a}{a-x}$

where,

k = rate constant = ?

t = time taken for decay process = 8.32 seconds

a = initial amount of the reactant = 80 mg

a - x = amount left after decay process = 20 mg

Putting values in above equation, we get:

$k=\frac{2.303}{8.32sec}\log\frac{80g}{20}\\\\k=0.166sec^{-1}$

The equation used to calculate half life for first order kinetics:

$t_{1/2}=\frac{0.693}{k}$

where,

$t_{1/2}$ = half life of the reaction = ?

k = $0.166sec^{-1}$

Putting values in above equation, we get:

$t_{1/2}=\frac{0.693}{0.166sec^{-1}}=4.16sec$

Hence, the correct answer is Option 3.

5 0

2 years ago

Read 2 more answers