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3 years ago

Thermal radiation emitted by objects allows us to feel infrared energy as _____

Chemistry

1 answer:

Luda [366]3 years ago

6 0

Answer:

THERMAL IMAGING

We can sense some infrared energy as heat. Some objects are so hot they also emit visible light—such as a fire does. Other objects, such as humans, are not as hot and only emit only infrared waves.

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I need help I can't chose between A or D

djyliett [7]

That’s a hard one, but honestly i would go with a.

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3 years ago

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Where is the majority of Earth’s water found? glaciers

galben [10]

Oceans are the most common of course

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3 years ago

State what would be observed when the following pairs of reagents are mixed in a test tube.

Mandarinka [93]

Answer:

(i). C6H2COOH and Na2CO3(aq)

observation: Bubbles of a colourless gas (carbon dioxide gas)

(ii) CH3CH2CH2OH and KMnO4 /H

observation: The orange solution turns green.

[This is because oxidation of propanol to propanoic acid occurs]

(iii) CH3CH2OH and CH3COOH + conc. H2SO4

observation: A sweet fruity smell is formed.

[This is because an ester, diethylether is formed]

(iv) CH3CH = CHCH3 and Br2 /H2O

observation: a brown solution is formed.

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2 years ago

How many valence electrons are in an atom. Of each element in group 15 in the periodic table.

oee [108]

Answer:

Five

Explanation:

All group 15 elements have five valence electrons, but they vary in their reactivity.

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2 years ago

Which of the following chemical equations proves that the law of conservation of mass is in effect?

bogdanovich [222]

Answer:

2KCl + F₂ → 2KF + Cl₂

Explanation:

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

2KCl + F₂ → 2KF + Cl₂

In this equation mass of reactant and product is equal. There are 2 potassium 2 chlorine and fluorine atoms on both side of equation it means mass remain conserved.

All other options are incorrect because mass is not conserved.

Mg₂ + LiBr ---> LiMg + Br

In this equation mass of magnesium is more on reactant side.

Na +O₂ ---> Na₂O

In this equation there is more oxygen and less sodium on reactant side while there is more sodium and less oxygen on product side.

H₂O ---> H₂ + O₂

In this equation there is less oxygen on reactant side while more oxygen on product side.

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3 years ago