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pychu [463]
3 years ago
5

Considering particles at the subatomic level, carrying out this experiment would help to identify the metals given that: Ca has

the
Choose...
atomic radius. In chemical reactions, it would be
Choose...
for it to lose its valence electrons to form ions. This means it has comparatively
Choose...
ionization energies and would react more
Choose...
with the water.
Chemistry
1 answer:
svet-max [94.6K]3 years ago
4 0

Answer:

we can do it again and again and again and again and again and again

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Convert 24 cm to the unit km
podryga [215]
K H D b d c m
So 10000 cm in a Km
A
6 0
4 years ago
Read 2 more answers
It takes Serina 0.25 hours to drive to school. Her route is 16 meters long. What is
Yakvenalex [24]

Answer:

60 (1 hour) × 0.25 = 15 minutes

15 ÷ 16 = 0.9375 meters per minute

5 0
4 years ago
A person of 82 kg is in an elevator. If the elevator is moving at a speed of 5m/s, what’s the person’s kinetic energy.
andre [41]

Answer:

The person’s kinetic energy is 1,025 J

Explanation:

Kinetic energy is a form of energy. It is defined as the energy associated with bodies that are in motion and this energy depends on the mass and speed of the body.

Kinetic energy is defined as the amount of work necessary to accelerate a body of a given mass and in a position of rest, until it reaches a given speed. Once this point is reached, the amount of accumulated kinetic energy will remain the same unless there is a change in speed or the body returns to its state of rest by applying a force.

Kinetic energy is represented by the following formula:

Ec=\frac{1}{2}*m*v^{2}

where Ec is kinetic energy, which is measured in Joules (J), m is mass measured in kilograms (kg), and v is velocity measured in meters over seconds (m/s).

In this case:

  • Ec= ?
  • m= 82 kg
  • v= 5 \frac{m}{s}

Replacing:

Ec=\frac{1}{2}*82 kg*(5\frac{m}{s} )^{2}

Solving:

Ec= 1,025 J

<u><em>The person’s kinetic energy is 1,025 J</em></u>

3 0
3 years ago
How many kilojoules are released when 2.25 mol of H2O2 reacts?
Stels [109]

Answer:

230.3 kJ

Some chemical reactions show release of heat while some show absorption of heat. On these bases, the reaction is classified as either endothermic or exothermic. Negative sign of ΔH means exothermic reaction.

8 0
3 years ago
A sample of gas has an initial volume of 20 L and an initial pressure of
Kitty [74]

The new volume of the gas is 16.3 L.

<h3>Boyle's law</h3>

Boyle's law states that the volume of a fixed mass of gas is inversely proportional to its pressure, at a constant temperature.

To calculate the new volume of the gas, we use the expression from Boyle's law.

Formula:

  • PV = P'V'............. Equation 1

Where:

  • P = initial pressure of gas
  • V = Initial volume of gas
  • P' = Final pressure of gas
  • V' = Final volume of gas

Make V' the subject of the equation

  • V' = PV/P'............. Equation 2

From the question,

  • V = 20 L
  • P = 2.5 atm
  • P' = 3.1 atm

Substitute these values into equation 2

  • V' = (20×2.5)/3.1
  • V' = 16.13 L.

Hence, The new volume of the gas is 16.3 L.

Learn more about Boyle's law here: brainly.com/question/26040104

3 0
3 years ago
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