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Y_Kistochka [10]
2 years ago
13

Which theory was contradicted by experiments with the photoelectric effect?

Chemistry
2 answers:
olga55 [171]2 years ago
8 0

Answer:

C Visible light...

Explanation:

irina [24]2 years ago
8 0

Answer:

C. Visible light, regardless of color, will cause the ejection of electrons when striking metal.

Explanation:

I got it right on the quiz edg21

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Which subatomic particle plays the greatest part in determining the properties of an element?
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Electrons - they are the particles that determine the chemical properties of an element
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Please help me answer this question I need it before 12:59
AlekseyPX

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because the brian is like a computer because that both use electrical signals to send messages the brain uses chemicals to transmit information and the computer uses electricity.

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What do plants do with sugar? *
Dafna11 [192]

eat for energy

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plants eat the sugar for energy

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A compound contains 75% carbon and 25% hydrogen by mass. What is the empirical formula for this compound?
timama [110]
The empirical formula would be CH4.


“To get the empirical formula of the compound, we convert each mass percentage to mole percentage by dividing each to corresponding molar mass. 75% mass of carbon is 6.25 while 25% hydrogen is 25. We divide 25 by 6.25, we get 4. Hence, the empirical formula is CH4.”
6 0
3 years ago
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For each of the environments below: (1) identify your system and surroundings and (2) predict whether it would be endothermic or
SCORPION-xisa [38]

Answer:

<u>A) Wood burning </u>

system : Wood.

surroundings : atmosphere

Enthalpy : Exothermic

<u>B) Water Freezing system </u>

System : Refrigerator

surroundings :  water in the refrigerator

enthalpy change : Endothermic

<u>C) Sweat evaporating </u>

System :  Human being

surroundings : Air nearby

Enthalpy change : exothermic

<u>D) Chemical Hand-warmer </u>

system : Hand warmer pack

Surroundings : human palms

Enthalpy Change : Exothermic

Explanation:

<u>A) Wood burning </u>

system : Wood

surroundings : atmosphere

Enthalpy : Exothermic

This system give away energy to its surroundings hence its enthalpy change is exothermic

<u>B) Water Freezing system </u>

System : Refrigerator

surroundings :  water in the refrigerator

enthalpy change : Endothermic

The system absorbs heat from what is put inside(surroundings ) of it hence this is na endothermic system

<u>C) Sweat evaporating </u>

System :  Human being

surroundings : Air nearby

Enthalpy change : exothermic

This is an exothermic reaction ( enthalpy change ) because the system gives out heat to the surrounding

<u>D) Chemical Hand-warmer </u>

system : Hand warmer pack

Surroundings : human palms

Enthalpy Change : Exothermic

There is movement of heat from the system to the surrounding hence it is an exothermic reaction

6 0
2 years ago
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