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3 years ago

A double replacement reaction is a reaction in which one element replaces a similar element within a compound.

Chemistry

2 answers:

ladessa [460]3 years ago

6 0

False. What you’re describing is a displacement reaction.

nevsk [136]3 years ago

5 0

The asbswer is false ur welcome

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Which statement justifies that phosphine (PH3) is a polar molecule?

lorasvet [3.4K]

The P-H bond is polar and the molecule is asymmetric.

Non-polar bonds cannot produce polar molecules and symmetric bonds result in even distribution of charge, so no net charge is observed.

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4 years ago

1. Which of the following metals oxidized by calcium ions?

viktelen [127]

1 A

2 B

3 B

4 A

5 B

6 D

7 D

8 B

8 0

3 years ago

Please help as fast as u can

pav-90 [236]

Answer:D

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Explanation:

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3 years ago

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If a beaker of water and a beaker of acetic acid are at the same elevated temperature, which will cool more quickly to room temp

WINSTONCH [101]

Beaker of water i guess because usually at home when i get out cold water i put in my room and it cools fast for me so..... i think

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3 years ago

The isotope 238U, which starts one of the natural radioactive series, decays first by alpha decay followed by two negative beta

Digiron [165]

Answer: The resulting isotope is $^{231}_{92}\textrm {U}$

Explanation:

Alpha Decay: In this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. The mass number is reduced by 4 units and atomic number is reduced by 2 units.

$^{235}_{92}\textrm{U} \rightarrow ^{231}_{90}\textrm {Th}+^{4}_{2}n$

Beta Decay : It is a type of decay process, in which a proton gets converted to neutron and an electron. This is also known as -decay. In this the mass number remains same but the atomic number is increased by 1.

$^{231}_{90}\textrm{Th}\rightarrow ^{231}_{92}\textrm {Th}+2^{0}_{-1}n$

The resulting isotope is $^{231}_{92}\textrm {U}$

6 0

3 years ago