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topjm [15]
2 years ago
9

A teacher had her students write down hypotheses about an experiment. Which is a valid hypothesis? (1 po If Earthquakes occur, t

hen tornados could occur at the same time. If people like the smell of burning wood, then they would not like the smell of gasoline. O All living organisms are made from at least one cell: O Energy gets transferred among all the organisms of a food chain.​
Chemistry
1 answer:
Alja [10]2 years ago
3 0

if people like the smell of burning wood, then they would not like the smell of gasoline

Explanation:

it's a supposition without any real truth to back it up

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The mass of an atom of element x is equivalent to the total mass of 7 hydrogen atoms
Sergeu [11.5K]
Hydrogen mass is 1, the atom with mass number 7 is Lithium
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2 years ago
How does the type of medium affect a sound wave? Give an Example
ivanzaharov [21]

Answer:

Sound waves need to travel through a medium such as solids, liquids and gases. The sound waves move through each of these mediums by vibrating the molecules in the matter. The molecules in solids are packed very tightly. Liquids are not packed as tightly.Of the three mediums (gas, liquid, and solid) sound waves travel the slowest through gases, faster through liquids, and fastest through solids. Temperature also affects the speed of sound.Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves. A vibrating string can create longitudinal waves as depicted in the animation below.

Explanation:

4 0
3 years ago
HELP!!!! The freezing of methane is an exothermic change. What best describes the temperature conditions that are likely to make
vazorg [7]

<u>Answer:</u> The correct statement is low temperature only, because entropy decreases during freezing.

<u>Explanation:</u>

The relationship between Gibb's free energy, enthalpy, entropy and temperature is given by the equation:

\Delta G=\Delta H-T\Delta S

Where,

\Delta G = change in Gibb's free energy

\Delta H = change in enthalpy

T = temperature

\Delta S = change in entropy

It is given that freezing of methane is taking place, which means that entropy is decreasing and Delta S is becoming negative. It is also given that the reaction is an exothermic reaction, this means that the \Delta H is also negative.

For a reaction to be spontaneous, \Delta G must be negative.

-ve=-ve-[T(-ve)]\\\\-ve=-ve+T

From above equations, it is visible that \Delta G will be negative only when the temperature will be low.

Hence, the correct statement is low temperature only, because entropy decreases during freezing.

8 0
3 years ago
Question 4 (higher question)
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Answer:

Explanation:

Describe means you should recall facts, events or processes accurately. You might need to give an account of what something looked like, or what happened.

Explain means you need to make something clear, or state the reasons for something happening.  

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Evaluate means you must use information supplied, or your own knowledge, to consider the evidence for and against or to identify strengths and weaknesses. You must then complete your answer with a conclusion, stating which is better and why, for example.

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3 years ago
Helppp meee plzzz plzzzz<br> Helppp
Rus_ich [418]

Answer:F =MAX

Explanation:I did that

7 0
3 years ago
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