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4 years ago

write a balanced chemical equation for the reaction that occurs when calcium metal undergoes a combination reaction with O2(g).

Chemistry

1 answer:

lisabon 2012 [21]4 years ago

3 0

1) reactants: Ca + O2 (g)

2) Unbalanced equation: Ca + O2 (g) -> CaO

3) Balanced equation: 2Ca + O2 (g) -> 2CaO

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A man ran 60.5 km, how far is this in yards?

pickupchik [31]

Answer:

66163.604

Explanation:

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3 years ago

Rocks carried by the river smash together and break into smaller pieces. This process is called

Reptile [31]

Rocks carried by the river smash together and break into smaller pieces. This process is called attrition.

Explanation:

Rocks carried by the river smash together and break into smaller pieces. This process is called attrition.
attrition is a form of coastal or river erosion, Attrition is an erosional process where rocks and pebbles are carried in the flow of a river.
Abrasion occurs when the breaking waves which contain sand and larger pieces erode the shoreline or headland of the shore.
When the rocks continue to collide with each other,they erode more and more, getting smaller and smaller until they are only sediment, this is when rocks that the sea is carrying
The amount of attrition depends upon the number of factors: particle properties such as its size, shape, surface, hardness, and cracks.
It also have environmental properties such as time, velocity, pressure, shear, and temperature.

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3 years ago

What information do we need to determine the molecular formula of a compound from the empirical formula?

defon

Answer:

Molecular mass

Explanation:

Molecular formulas is the actual number of atoms of each element in the compound while empirical formulas is the simplest or reduced ratio of the elements in the compound.

Thus,

Molecular mass = n × Empirical mass

Where, n is any positive number from 1, 2, 3...

Thus if the molecular mass is known, then we can find the value of n which results to molecular formula.

6 0

4 years ago

A scientist observed that a gas expanded from a volume of 0.200 L to a volume of 0.876 L. (a) What is the amount of work (in jou

Romashka [77]

Answer :

(a) The amount of work performed in this process is -26.6 J

(b) The value of change in internal energy is 0 J and change in heat is 26.6 J

Explanation :

As per first law of thermodynamic,

$\Delta U=q+w$

where,

$\Delta U$ = internal energy

q = heat

w = work done

As we know that, the term internal energy is the depend on the temperature and the process is isothermal that means at constant temperature.

So, at constant temperature the internal energy is equal to zero.

$\Delta U=0$

$q=-w$

The formula used for isothermally irreversible expansion is :

$w=-p_{ext}dV\\\\w=-p_{ext}(V_2-V_1)$

where,

w = work done

$p_{ext}$ = external pressure = 0.389 atm

$V_1$ = initial volume of gas = 0.200 L

$V_2$ = final volume of gas = 0.876 L

Now put all the given values in the above formula, we get :

$w=-p_{ext}(V_2-V_1)$

$w=-(0.389atm)\times (0.876-0.200)L$

$w=-0.263L.atm=-0.263\times 101.3J=-26.6J$

The work done by the system on the surroundings are, -26.6 Joules. In this, the negative sign indicates the work is done by the system on the surroundings.

Therefore, the amount of work performed in this process is -26.6 Joules.

q = - w = -(-26.6 J) = 26.6 J

Net heat transfer is, 26.6 J

6 0

4 years ago

How is a compound different from a mixture? *

andreyandreev [35.5K]

Answer:

a. mixtures are created through physical changes and compounds are created through chemical reactions

Explanation:

5 0

3 years ago