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Andrei [34K]
3 years ago
15

Complete the questions below using the following diagram.

Chemistry
1 answer:
Vadim26 [7]3 years ago
5 0

Answer:

atomic number- 42

chemical number- 96

number of protons-18

atomic mass-96

number of eletrons-42

number of valence eletrons- 1, 2, 13, or 18. (sorry i forgot)

nummber of shells in n=3 shell-18

number of neutrons-54

Explanation:

well i just know the periodic table by heart and thats how i got the answer XD

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When the volume of a gas is
Montano1993 [528]

Answer:

\boxed {\boxed {\sf 232.9 \textdegree C}}

Explanation:

This question asks us to find the temperature change given a volume change. We will use Charles's Law, which states the volume of a gas is directly proportional to the temperature. The formula is:

\frac {V_1}{T_1}= \frac{V_2}{T_2}

The volume of the gas starts at 250 milliliters and the temperature is 137 °C.

\frac{250 \ mL}{137 \textdegree C}= \frac{V_2}{T_2}

The volume of the gas is increased to 425 milliliters, but the temperature is unknown.

\frac{250 \ mL}{137 \textdegree C}= \frac{425 \ mL}{T_2}

We are solving for the new temperature, so we must isolate the variable T₂. First, cross multiply. Multiply the first numerator and second denominator, then multiply the first denominator and second numerator.

250 \ mL * T_2 = 137 \textdegree C * 425 \ mL

Now the variable is being multiplied by 250 milliliters. The inverse of multiplication is division. Divide both sides of the equation by 250 mL.

\frac{250 \ mL * T_2}{250 \ mL}=\frac{ 137 \textdegree C * 425 \ mL}{250 \ mL}

T_2=\frac{ 137 \textdegree C * 425 \ mL}{250 \ mL}

The units of milliliters (mL) cancel.

T_2=\frac{ 137 \textdegree C * 425 }{250 }

T_2= \frac{58225}{250} \textdegree C

T_2=232.9 \textdegree C

The temperature changes to <u>232.9 degrees Celsius.</u>

3 0
3 years ago
Ibuprofen is a common pain reliever and anti-inflammatory. Its formula is C13H18O2. What percent by mass of ibuprofen is the car
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Answer:

Explanation:

%Carbon =  mass of carbon / mas of C13H18O2) X100%

             =      13X12/ (13X12+18+2X16)X100%

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Answer:

Resistance

Explanation:

Resistance is the measure of the opposition of current in a circuit.

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there are 6 moles of oxygen in Zn(No3)2

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If 4.80 mol Ca mixed with 2 mol N2, which is the limiting reactant? 3Ca (s) + N2 (g) Ca3N2 (s)
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