Chemical reactions produces new substances and may be a synthesis, decomposition, combustion, replacement, or neutralization reaction.
<h3>What are chemical reactions?</h3>
Chemical reactions are changes which occurs in substances producing changes in the chemical properties of the substance.
The chemical reactions described are as follows:
- Synthesis: at least two reactants and one product
- Decomposition: at least one reactant and two products
- Combustion: oxygen is one of the reactants and large amount of energy is released
- Replacement: at least one or more atoms replaces a part of a compound
- Neutralization: the products are always salt and water
Learn more about chemical reactions at: brainly.com/question/11231920
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Answer:
<h2>31km/h</h2>
Explanation:
Step one:
given data
speed of bus= 35km/h forward
speed of ball= 4km/h backwards
`Step two:
Required
the magnitude of the velocity of the ball relative to the ground is the net velocity
that is
=35-4
=31km/h
<em><u>The velocity of the ball relative to the ground is 31km/h</u></em>
Answer:
Explanation:
Kinetic energy gained by alpha particle
= charge x potential difference
1/2 mv² = 3.2 x 10⁻¹⁹ x 3.45 x 10⁻³
.5 x 6.68 x 10⁻²⁷ V² = 11.04 x 10⁻²²
V² = 3.3 x 10⁵
V = 5.74 x 100
= 574 m / s
Mechanical energy is conserved in respect of A , C and D .
Part B
B , C, are unknown .
Answer:
Her average speed is 5 miles per hour.
Explanation:
Average speed is the ratio of total distance travelled in particular time.
The park's pond is 0.5 miles around.
She can swim 20 laps, it means she can swim total = 20 × 0.5
= 10 miles.
Time taken by her to complete the track = 2 hour
Now, Average speed = ![\frac{distance }{time\ taken }](https://tex.z-dn.net/?f=%5Cfrac%7Bdistance%20%7D%7Btime%5C%20taken%20%7D)
= ![\frac{10 miles}{2 hour}](https://tex.z-dn.net/?f=%5Cfrac%7B10%20miles%7D%7B2%20hour%7D)
= 5 miles/hour.