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Chemistry

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Nova Bernier

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โˆ™ 2021-10-18 18:34:18
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Cards in this guide (30)
Nuclear fission reactions involve the

Splitting of atom

What process by which one element changes into another element

Transmutation is the process by which one element changes into another element.

Groups are organized by the number of electrons that are found in their outer shell

valence

Carbon has an atomic mass of 12 and an atomic number of 6 so the number of neutrons must be

6

Which of the following elements tend to be radioactive

Ra and Ac

Pu and Th

Am and U

A reaction of an acid and a base will produce water and what

A textbook acid-base reaction will produce water and a salt.

A base is a substance that produces hydrogen ions in a water solution

False

Are binary ionic compounds called salts

yes, but not all salts are binary ionic compounds

Is the measure of the amount of disorder in a system

Entropy

An bond is an electrostatic attraction between atoms of opposite charges

ionic

Which produces the least energy

using 10 kg of fuel in a fuel cell.

What happens to the pressure and the molecules inside a football that is being pumped up

The pressure increases, and the molecules collide with the football's inner surface.

Which pieces of information do the squares on the periodic table reveal

atomic mass, atomic symbol, atomic number

The elements within a group tend to share

similar chemical properties and characteristics

An element is a substance composed of atoms that all have the same number of electrons

False

Groups are organized by the number of valence electrons that are found in their outer electron

shell

An element is a substance composed of atoms that all have different numbers of protons

No . all the atoms have same no of protones.....

In the compound NH3 nitrogen has an oxidation number of 3 plus and hydrogen has an oxidation number of

The assumed oxidation number of nitrogen in ammonia (3+) in this question, is wrongly signed:

The correct oxidation number if nitrogen in NITRIDES (like in ammonia NH3, ammonium NH4+ and amino groups -NH2) is minus 3, so hydrogen has oxidation value of plus 1(one, like in H+) which is in fact the only possible form when attached to nonmetals.

Alpha decay and beta decay are two forms of decay that cause transmutation

radioactive

What kind of reaction occurs when a substance is broken down into two or more simpler substances in a chemical reaction

Breaking a substance down into two or more simpler substances is called as decomposition reaction.

According to the second law of thermodynamics it is not possible to transfer heat from an object at a lower temperature to another object at a higher temperature unless work is done

true

Double-displacement reactions are often defined by which of the following

A double-displacement reaction is characterized by the fact that bonds of the reactants are changed.

The electron group geometry is equal to the number of the bonding pairs of electrons in a covalent bond

No, this is false.

The electron group geometry has nothing in common with the number of the bonding pairs of electrons in a covalent bond.

If the slope of the green line is -3 what is the slope of the red line
  • The lines below are perpendicular. If the slope of the green line is -1, what is the slope of the red line?
She measured 5.0 kg of substances x at noon Tuesday shaunameasured 1.25 kg of substance x what is the half- life of substance x

If substance x decays by emitting 100% gas which escapes leaving no residues, then the half-life is half the time elapsed since noon Tuesday

If substance x contains some components which decay by say, K capture (the nucleus captures one of its orbiting electrons) with practically no change in mass, then the picture is complicated because it may have a short half-life, not detectable by weighing.

For this reason half-life is not determined or defined by weight. It is defined by the proportion of the original atomic species which remains after some interval of time, possibly determined by, say, chemical or spectroscopic analysis.

Which of the following are equal to 233 K 40C 80F -40F -40C

233.15 K is -40 deg F or -40 deg C (the latter two are the same).

So, to the nearest whole degree, 233K would be equal to -40F or -40C

What does bismuth 210 become when it undergoes alpha decay

bismuth 210 decays by beta decay to polonium 210 that decays by alpha decay to lead 206

What is the atomic number for a element with mass number 12

An atomic mass of 12 means carbon, and its atomic number is 6.

Strontium decays by beta decay part of the nuclear equation is shown below fill in the blank with a number

39 APEX

What. The lines below are parallel. If the green line is -4, what is the slope of the red line

4

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