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Neporo4naja [7]
3 years ago
14

Identify the type and number of atoms in each molecule of the reactants and products.

Chemistry
1 answer:
Mnenie [13.5K]3 years ago
3 0

Answer:

CaCO3: 1 calcium 1 carbon 3 oxygen

CaO: 1 calcium 1 oxygen

CO2: 1 carbon 2 oxygen

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Which is true for a substance that releases energy?
scoundrel [369]

The correct answer is option A, that is, the energy release decreases the molecular motion and the kinetic energy of the substance.

When a substance discharges energy, it signifies that the energy of the molecules is now being transferred into the substance with whom it comes in contact with or into the atmosphere. Thus, at the time of the discharge of energy, the motion of molecules diminishes and as a consequence, the kinetic energy of the molecules will reduce.  

Therefore, it can be concluded that for a substance the energy discharged diminishes the molecular motion and the kinetic energy of the substance.  


5 0
3 years ago
Please show the work :(What is the estimated force applied to the box if the acceleration is .40 m/s2?
lara31 [8.8K]

Answer:

20N

Explanation:

Given parameters:

        Force(N)     Acceleration(m/s²)  

            10                   0.2

           ?                      0.4

Unknown:

The force applied when the acceleration is 0.4m/s²

Solution:

From newton's second law of motion;

 Force = mass x acceleration

 Since we are using the same box, let us find the mass of the box;

      Force  = mass x acceleration

         10 = mass x 0.2

            mass = \frac{10}{0.2}  = 50kg

Now,

 The force in the second instance will be;

      Force  = 50 x 0.4  = 20N

8 0
3 years ago
What is the source of EXTERNAL energy for Earth's spheres and systems?
Naya [18.7K]

The earth is a vast, complex system powered by two sources of energy: an internal source (the decay of radioactive elements in the geosphere, which generates geothermal heat) and an external source (the solar radiation received from the Sun); the vast majority of the energy in the earth system comes from the Sun.

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Which of the following would qualify as matter?
Olin [163]

Answer:

the water, gasoline, sand, and sugar

Explanation:

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