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3 years ago

What type of change does electron have?

2 answers:

7 0

Proton—positive; electron—negative; neutron—no charge. The charge on the proton and electron are the same size but opposite. The same number of protons and electrons exactly cancel one another in a neutral atom.

Gala2k [10]3 years ago

3 0

If you mean charge than that would be negative

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Considering the side chain of each of the amino acids at pH 7.4, is that amino acid classified at neutral, basic, or acidic? You

arlik [135]

Answer:

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6 0

3 years ago

Atomic number of f^-1

victus00 [196]

The atomic number is 9 Ions have the same atomic number since atomic number signifies number of protons not electrons

7 0

4 years ago

PLEASE HELP ME If a radioactive substance has an initial mass of 50 grams

Yuri [45]

Answer: $3.125\ g$

Explanation:

Given

Initial mass $A_o=50\ g$

half-life is $T_{\frac{1}{2}}=5\ years$

At any time the left amount is given by

$A=A_o2^{-\dfrac{t}{T_{\frac{1}{2}}}}\\\\\text{Insert the values}\\\\A=50\cdot 2^{-\dfrac{20}{5}}\\\\A=50\cdot 2^{-4}\\\\A=\dfrac{50}{16}\\\\A=3.125\ g$

3 0

3 years ago

If the NaOH is added to 35.0 mL of 0.167 M Cu(NO3)2 and the precipitate isolated by filtration, what is the theoretical yield of

Ghella [55]

Answer:

The correct answer is - 0.570 grams

Explanation:

The balanced chemical reaction is given by

Cu(NO3)2(aq) + 2NaOH(aq) --------> Cu(OH)2(s) + 2NaNO3(aq)

1.0 mole 2.0 mole 1.0 mole 2.0 mole

number of mol of Cu(OH)2,

n = Molarity * Volume

= $35.0*0.167 = 5.845$ millimoles

As clear in the equation, 1 mole of Cu(NO3)2 gives 1 mole of Cu(OH)2 , So, 5.845 millimoles of Cu(NO3)2 will produce 5.845 millimoles of Cu(OH)2

Mass of Cu(OH)2 = number of mol * molar mass

= $97.5*5.845*10^-3$

= 0.570 grams

Thus, the correct answer is - 0.570 grams

8 0

3 years ago

I need this answer ASAP! In order for conduction to transfer heat from one object to another, what must be true?

vampirchik [111]

Answer:

The objects should be far apart. There must be air circulation. The objects need to be touching. Solar energy is required.

Explanation:

6 0

3 years ago