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2 years ago

4AI + 30 ---> ---> 2A1 O

Chemistry

1 answer:

Aleks04 [339]2 years ago

5 0

Explanation:

Answer is 4Al + 3O2 =>2Al2O3

I hope it's helpful!

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How does the weather affect a dead body's temperature?

Fittoniya [83]

Answer:

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This occurs through radiation, convection, conduction, and, if the subject is wet, evaporation. Most commonly, the body temperature decreases, although in more extreme climates an increase in cadaver temperature may result.

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2 years ago

Moving molecules make things? heat up or cool down

Ksenya-84 [330]

Answer:

Heat up.

Explanation:

The faster molecules move the warmer an object becomes.

For example boiling water, when you boil water the water molecules will be moving extremely fast.

The slower molecules move, the colder an object is. For example an ice cube. All the molecules are only vibrating.

Hope this helps:)

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3 years ago

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All of the elements in the actinide family are ? (liquids/radioactive).

Aleksandr [31]

Answer:

Radioactive

Explanation:

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2 years ago

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A first-order decomposition reaction has a rate constant of 0.00440 yr−1. How long does it take for [reactant] to reach 12.5% of

mina [271]

Answer:

473 year

Explanation:

Using integrated rate law for first order kinetics as:

$[A_t]=[A_0]e^{-kt}$

Where,

$[A_t]$ is the concentration at time t

$[A_0]$ is the initial concentration

Given:

To reach 12.5% of reactant means that 0.125 of $[A_0]$ is decomposed. So,

$\frac {[A_t]}{[A_0]}$ = 0.125

t = ?

$\frac {[A_t]}{[A_0]}=e^{-k\times t}$

$0.125=e^{-0.00440\times t}$

t = 473 year

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3 years ago

Which Of These Is An Indication That A Chemical Reaction Has Occurred?

nikdorinn [45]

Answer:

Correct option is D. Formation Of A Gas

Explanation

The main indication of chemical is that new substances are formed which have different composition than reactant.

Freezing of a substance: As in this case composition remained same, so we cant say, chemical reaction is take place, like when water freezes, it composition is same as water , so it is only its physical properties, not chemical.

Melting of a substance: As in this case composition remained same, so we cant say, chemical reaction is take place, like when ice melts, composition of water remained same , so it its physical properties, not chemical.

Boiling of a substance: As in this case composition remained same, so we cant say, chemical reaction is take place, like when water boils and become vapors, composition of water and vapors remained same , so it its physical properties, not chemical properties which show its chemical reaction.

Formation of gas:

In this case, chemical reaction take place. In chemical reactions, new substance are formed whose composition is different from reactants.

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3 years ago

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