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2 years ago

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?

Stolb23 [73]

Electrons - they are the particles that determine the chemical properties of an element

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AlekseyPX

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3 years ago

What do plants do with sugar? *

Dafna11 [192]

eat for energy

Explanation:

plants eat the sugar for energy

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3 years ago

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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.”

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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:

A) Wood burning

system : Wood.

surroundings : atmosphere

Enthalpy : Exothermic

B) Water Freezing system

System : Refrigerator

surroundings : water in the refrigerator

enthalpy change : Endothermic

C) Sweat evaporating

System : Human being

surroundings : Air nearby

Enthalpy change : exothermic

D) Chemical Hand-warmer

system : Hand warmer pack

Surroundings : human palms

Enthalpy Change : Exothermic

Explanation:

A) Wood burning

system : Wood

surroundings : atmosphere

Enthalpy : Exothermic

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

B) Water Freezing system

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

C) Sweat evaporating

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

D) Chemical Hand-warmer

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

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2 years ago