Pick a common happening , develop an explanation for it , and describe an experiment you could perform to test your explanation.

1 answer:

5 0

Plant's produce oxygen, to explain this you would state that the plant uses CO2 from the air and removes the carbon and then release breathable O2 into the atmosphere. To test this you could use a small fern and put it in a sealed container of some kind big enough to hold it, then add a burning candle in the container with the plant, since we know fire burms O2 and creates CO2 the plant should use the CO2 and create more O2 keeping the fire from burning out from lack of oxygen

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A _____ is a object that will separate light into different colors

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Prism will be your answer

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A 2.0-g piece of Mg reacts with HNO3. Which conditions would produce the GREATEST reaction rate

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Answer:

1.0 M HNO3 at 40°C

Explanation:

Rate of chemical reaction: This can be defined as the number of moles of reactant, converted or product formed per unit time.

Factors that affect rate of chemical reaction:

(a) Temperature: Generally, an increase in temperature increase the rate of chemical reaction by (1) increasing the number of particles with energy equal to or greater than the activation energy, (2) Increasing the average speed of all the reactant particles, due to greater kinetic energy, leading to higher frequency of collision.

(b) Concentration: An increase or decrease in the concentration of the reactant will result to a corresponding increase or decrease in the effective collision of the reactant and hence in the reaction rate.

other factors that affect the rate of chemical reaction are

(i) Nature of the reactant

(ii) Surface area of reactant

(iii) presence of light

(iv) presence of catalyst.

From the question above,

The condition with the highest temperature and concentration will produce the GREATEST reaction rate.

And that is 1.0 M HNO3 at 40 °C

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4 years ago

Why do compass needles around a current carrying wire point in different directions

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Answer: because of the magnetic

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A spin balancer rotates the wheel of a car at 480 revolutions per minute. if the diameter of the wheel is 26 inches, what road s

Mariana [72]

Part A:
To answer this item, we need to convert the given revolutions per minute in speed expressed as miles per hour. In order to do so, we need to use the dimensional analysis and the appropriate conversion factor.

We calculate the circumference that is covered by the wheel.
C = πD
where C is the circumference and D is the diameter.

Substitute the known values,
C = π(26 in) = 81.68 inches

The speed tested is calculated below.
s = (81.68 inches/rev)(480 rev/min)(1 mil/63360 inches)(60 min/1 hr)
s = 37.127 mil/h

ANSWER: 37.127 mil/h

Part B:
Similar to what was done in Part A, the setting of the balancer is calculated below,
setting = (80 mil/h)(1h/60 min)(63360 in/1 mil)(1 rev/81.68 in)
setting = 1034.23 rev/min

ANSWER: 1034.23 rev/min

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The atomic number of beryllium (Be) is 4, and the atomic number of barium (Ba) is 56. Which comparison is best supported by this

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The atomic number of beryllium (Be) is 4, and the atomic number of barium (Ba) is 56. the comparison is best supported by this information is that beryllium has a lower atomic radius than Barium

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