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4 years ago

A change in the properties of matter that does not change the identity of the substance is:

2 answers:

6 0

No, the correct answer is B. Physical change because the identity of the substance does not change.
For example, if you take a piece of paper and tear it in half you actually changed its property because now those pieces of paper have half the weight and and size that they did before you did anything. Now you know its a physical change because its still paper all you have done is change the physical appearance.
Hope this was helpful(;

Ostrovityanka [42]4 years ago

5 0

Answer:

The correct answer is option B.

Explanation:

Chemical change is defined as the change of a substance which is observed during a reaction where the chemical composition identity of the substance gets changed.

Physical change is defined as the change which can be measured and whose value describes the state of physical system. For Example: State, density etc.

Nuclear change is defined as change when a nucleus of an undergoes fission or fusion that is combining of neutrons and protons to form new heavier atom.

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Given that E°red = -0.40 V for Cd2+/Cd at 25°C, find E° and E for the concentration cell expressed using shorthand notation belo

tensa zangetsu [6.8K]

From the information in the question, the E° and E for the cell is 0.00 V and 0.12 V.

Using the Nernst equation;

Ecell = E°cell - 0.0592/n log Q

We know that E°cell = 0.00 V since the anode and cathode are both made up of cadmium.

Substituting the given values into the Nernst equation;

Ecell = 0.00 V - 0.0592/2 log (1.0 × 10-5 M/0.100 M)

Ecell = 0.00 V - 0.0296 log(1 × 10^-4)

Ecell = 0.12 V

Learn more: brainly.com/question/8646601

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3 years ago

PLZ HELP ME WITH MY WORK

34kurt

Answer:

option C 11

is the correct answer

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3 years ago

Covalent bonded atoms make up what

White raven [17]

In a covalent bond, the atoms bond by sharing electrons. Covalent bonds usually occur between nonmetals. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom.

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3 years ago

What is the reduction half-reaction for the equation below?

Katen [24]

Answer:

$MnO_4^-+8H^++5e^-\rightarrow Mn^{2+}+4H_2O$

Explanation:

Hello there!

In this case, since redox reactions are characterized by the presence of a reduction reaction, whereby the oxidation of the element decreases, and an oxidation reaction whereby the oxidation of the element increases.

In such a way, for the given chemical equation, we can see Fe is increasing its oxidation state from 2+ to 3+, which means it is oxidized. On the flip side, Mn is being reduced from 7+ (MnO₄⁻) to 2+ and this, the reduction half-reaction is:

$MnO_4^-+8H^++5e^-\rightarrow Mn^{2+}+4H_2O$

Whereas five electrons are carried.

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3 years ago

A compound with the molecular formula C10H10O4 produces a 1H NMR spectrum that exhibits only two signals, both singlets. One sig

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Answer:

The attached figure shows the structure of dimethyl terephthalate.

Explanation:

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4 years ago