3 years ago

True or False: The atomic number is the number of neutrons in an element?

Chemistry

1 answer:

klio [65]3 years ago

5 0

Answer:

true

Explanation:

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how many moles of silicon are in 245 g of silicon? a. 8.72 mol b. 28.0 mol c. 1.10 10-1 mol d. 6.90 103 mol

Salsk061 [2.6K]

Atomic mass silicon = 28.085 u

1 mol Si ---------------- 28.085 g
? ------------------------ 245 g

245 x 1 / 28.085 =><span> 8.72 mol</span>

<span>answer A</span>

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2 years ago

Convert 10mg x cm/s^2 to Newtons (kg x m/s^2)

AlexFokin [52]

$10\frac{mg*cm}{s^{2}}=10\frac{0,000001kg*0,01m}{s^{2}}=1*10^{-7}\frac{kg*m}{s^{2}}$

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3 years ago

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Vikentia [17]

It's an example of a molecule

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3 years ago

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On average, Earth’s crust contains about 8.1% aluminum by mass. If a standard 12-ounce soft drink can contains approximately 15

MrMuchimi

Answer:

5400 cans

Explanation:

First we convert the total weight, 1 ton, to grams:

$1ton=1x10^{6}g$

Now we need to know the mass of aluminum:

$m_{Al}=\frac{10^{6}*8.1}{100} =81000g$

Now we make the relation between the mass of aluminum in 1 ton of the earth's crust and the mass of aluminum per can:

$n=\frac{81000g}{15g/can} =5400cans$

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3 years ago

What is the independent and dependent variable?

tigry1 [53]

Independent is the variable that you change
Dependent is the thing you measure

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2 years ago