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4 years ago

Why do some atoms form positive ions and others form negative ions?

1 answer:

6 0

Atoms for negative or positive ions depending on whether they lose or gain electrons to achieve the stable octet. If an atom loses electrons then it would have a positive charge (cation) and if the atom gains electrons then it would become negatively charged (anion).

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This number tells you the number of each type of atom in a compound.

KonstantinChe [14]

Answer:

avogadro's constant

Explanation:

this is the fixed number of the atoms in the molecule of an element

avogadro's law states that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules

that is all gases with same temperature and pressure will always have equal numbers of molecules

7 0

3 years ago

how many kilograms of water must evaporate from 8kg of a 25% salt solution to produce 40% salt solution?

Lena [83]

Answer: The kilograms of water must evaporate from 8kg of a 25% salt solution to produce 40% salt solution is 3 kg.

Explanation:

According to the ratio and proportion:

$C_1m_1=C_2m_2$

where,

$C_1$ = concentration of ist solution = 25%

$m_1$ = mass of ist solution = 8 kg

$C_2$ = concentration of second solution = 40%

$m_2$ = mass of second solution = ? kg

$25\times 8=40\times m_2$

$m_2=5kg$

Thus the final solution must have a mass of 5 kg , i.e (8-5)= 3 kg of mass must be evaporated.

Therefore, the mass that must be evaporated from 8kg of a 25% salt solution to produce 40% salt solution is 3 kg.

6 0

3 years ago

If the pH of a solution is 5.4 then the concentration of H+ ions is ___|_x10^-6

Svetllana [295]

H is 4*10^6 M , OH is 2.5*10^-9 M

6 0

4 years ago

Which statement describes an atomic nucleus?

likoan [24]

The nucleus consists of the protons and neutrons. It contains the most mass in the atom.

4 0

3 years ago

Read 2 more answers

If 3.00 mL of 0.0250 M CuSO4 is diluted to 25.0 mL with pure water, what is the molarity of copper(II) sulfate in the diluted so

g100num [7]

Answer:

0.00268 M

Explanation:

To find the new molarity, you need to (1) find the moles of CuSO₄ (via the molarity equation using the beginning molarity and volume) and then (2) find the new molarity (using the moles and combined volume). Your final answer should have 3 sig figs to match the given values.

Step 1:

3.00 mL / 1,000 = 0.00300 L

Molarity = moles / volume (L)

0.0250 M = moles / 0.00300 L

(0.0250 M) x (0.00300 L) = moles

7.50 x 10⁻⁵ = moles

Step 2:

25.0 mL / 1,000 = 0.0250 L

0.0250 L + 0.00300 L = 0.0280 L

Molarity = moles / volume (L)

Molarity = (7.50 x 10⁻⁵ moles) / (0.0280 L)

Molarity = 0.00268 M

8 0

2 years ago