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melomori [17]
4 years ago
8

Cecil writes the equation for the reaction of hydrogen and oxygen below.

Physics
1 answer:
Mademuasel [1]4 years ago
5 0

Answer:

2h20

Explanation:

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Which feature of a balanced chemical equation demonstrates the law of conservation of mass?​
svetlana [45]

A balanced equation demonstrates the conservation of mass by having the same number of each type of atom on both sides of the arrow

6 0
3 years ago
What is the entropy change of a 0.349 g spoonful of water that evaporates completely on a hot plate whose temperature is slightl
quester [9]

Answer:

\Delta S = 2.11 J/K

Explanation:

As we know that entropy change for phase conversion is given as

\Delta S = \frac{\Delta Q}{T}

Here we know that heat required to change the phase of the water is given as

\Delta Q = mL

here we have

m = 0.349 g = 3.49\times 10^{-4} kg

L = 2250000 J/kg

now we have

\Delta Q = (3.49 \times 10^{-4})\times 2250000

\Delta Q = 788.9 J

also we know that temperature is approximately same as boiling temperature

so we have

T = 373 k

so here we have

\Delta S = \frac{788.9}{373}

\Delta S = 2.11 J/K

3 0
3 years ago
The quantum model suggests that electrons __________.
yan [13]

The correct answer is (d), electrons are in probable cloud location.

An atom is made up of three fundamental particles, electron, proton and neutron. Proton and neutron are located in the nucleus, while the electrons orbit the nucleus in relative large orbit, however the exact position of the electron in the shall is highly unpredictable, therefore they are assumed to be in probable cloud location where the probability of finding an electron is very high.

3 0
4 years ago
A sound wave of 70 cm travels 840 m in 2.5 sec. What is the velocity and frequency of sound?
Darya [45]
-- Speed = (distance) / (time to cover the distance) = 840/2.5 = 336 m/s

-- Frequency = (speed) / (wavelength) = 336/0.70 = 480 Hz. 
5 0
3 years ago
Calculate the work done by a 47 N force pushing a pencil 0.26 m. Question 1 options: A. 0.005 J B. 12.2 J C. 180.77 J
vfiekz [6]
The work done by a force when moving an object is given by:
W=Fd
where W is the work, F is the force and d the displacement of the object.
Therefore, using F=47~N and d=0.26~m, we get a total work of
W=Fd=47~N \cdot 0.26~m=12.22~J
4 0
4 years ago
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