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3 years ago

An atom of sodium-23 (Na-23) has a net charge of +1. Identify the number of protons, neutrons, and electrons in the atom.

Chemistry

1 answer:

Mashcka [7]3 years ago

7 0

Answer:

Explanation: Sodium has an atomic number of 11, so it has 11 protons. The atomic mass is 23, so there are 23 − 11 = 12 neutrons. The charge is +1, so there is 1 more proton than electrons, so there are 10 electrons

Explanation:

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A 15.0 g sample of nickel metal is heated to 100.0 degrees C and dropped into 55.0 g of water, initially at 23.0 degrees C. Assu

OLEGan [10]

Answer: The final temperature of nickel and water is $25.2^{o}C$ .

Explanation:

The given data is as follows.

Mass of water, m = 55.0 g,

Initial temp, $(t_{i}) = 23^{o}C$ ,

Final temp, $(t_{f})$ = ?,

Specific heat of water = 4.184 $J/g^{o}C$ ,

Now, we will calculate the heat energy as follows.

q = $mS \Delta t$

= $55.0 g \times 4.184 J/g^{o}C \times (t_{f} - 23^{o}C)$

Also,

mass of Ni, m = 15.0 g,

Initial temperature, $t_{i} = 100^{o}C$ ,

Final temperature, $t_{f}$ = ?

Specific heat of nickel = 0.444 $J/g^{o}C$

Hence, we will calculate the heat energy as follows.

q = $mS \Delta t$

= $15.0 g \times 0.444 J/g^{o}C \times (t_{f} - 100^{o}C)$

Therefore, heat energy lost by the alloy is equal to the heat energy gained by the water.

$q_{water}(gain) = -q_{alloy}(lost)$

$55.0 g \times 4.184 J/g^{o}C \times (t_{f} - 23^{o}C)$ = -( $15.0 g \times 0.444 J/g^{o}C \times (t_{f} - 100^{o}C)$ )

$t_{f} = \frac{25.9^{o}C}{1.029}$

= $25.2^{o}C$

Thus, we can conclude that the final temperature of nickel and water is $25.2^{o}C$ .

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3 years ago

Choose the system to which this item belongs: stomach

hram777 [196]

Digestive. This also includes the intestines.

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3 years ago

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Eddi Din [679]

True
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3 years ago

How many atoms are in 1.4 mol of phosphorus trifluoride (PF3)?

harkovskaia [24]

NA = 6.022*10^23
number of atoms = number of moles * avogadros number
number of atoms = <span>6.022*10^23 * 1.4 moles * 4 atoms / molecules of PCl3
Number of atoms = 3.37*10^23 atoms.</span>

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4 years ago

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Which chemical symbols will complete the equation for this single displacement reaction? 2NaBr + Cl2 → 2 blank blank + blank 2

arsen [322]

The symbols that will complete the equation for single displacement reaction is 2NaCl + Br2

Explanation

The balanced equation is as below

2NaBr + Cl2→ 2NaCl + Br2

A single displacement reaction is type of reaction in which element react with compound and take place of other element in that compound.

Mostly the more reactive element displaces the less reactive elements from its compound.

Chlorine (Cl2) is more reactive than bromine(Br2) therefore chlorine displaces bromine from its compound.

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4 years ago