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enyata [817]
3 years ago
10

21<2x+3 help fast please ​

Chemistry
2 answers:
kolezko [41]3 years ago
7 0

Answer:

Explanation:

x in (-oo:+oo)

2 < (1/2)*x-3 // - (1/2)*x-3

2-((1/2)*x)+3 < 0

(-1/2)*x+2+3 < 0

5-1/2*x < 0 // - 5

-1/2*x < -5 // : -1/2

x > -5/(-1/2)

x > 10

x in (10:+oo)

(10:+oo)

ValentinkaMS [17]3 years ago
5 0

Answer:

x > 9

Explanation:

21 < 2x + 3

Subtract 3 from both side

21 —3 < 2x + 3 —3

18 < 2x

Divide both side by the coefficient of x i.e 2

18/2 < x

9 < x

Since 9 is less than x, it therefore means that x is grater that 9.

x > 9

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Answer: 6.02214076 atoms Ca

Explanation:

Ca is monoatomic, so atoms in 1 mol = avogadro number

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The population of worms in a garden ecosystem is decreasing. The population of birds will most likely _____.
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Answer:

The population of birds would Decrease

Explanation:

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It also depends on what bird it is but with any species if there main source of food decrease then they decrease or move out of the area.

Hope this helps

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3 years ago
At what temperature (°C) will a 10.00 g sample of neon gas exert a pressure of 96.7 kPa in a
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Answer : The temperature of neon gas will be, 221.0 K

Explanation :

To calculate the temperature of neon gas we are using ideal gas equation.

PV=nRT\\\\PV=\frac{w}{M}RT

where,

P = pressure of neon gas = 96.7 kPa = 0.955 atm

Conversion used : (1 atm = 101.3 kPa)

V = volume of neon gas = 9.50 L

T = temperature of neon gas = ?

R = gas constant = 0.0821 L.atm/mole.K

w = mass of neon gas = 10.00 g

M = molar mass of neon gas = 20 g/mole

Now put all the given values in the ideal gas equation, we get:

(0.955atm)\times (9.50L)=\frac{10.00g}{20g/mole}\times (0.0821L.atm/mole.K)\times T

T=221.0K

Therefore, the temperature of neon gas will be, 221.0 K

7 0
2 years ago
What property is not used to separate a mixture ?
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Answer:

Conductivity

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2 years ago
How many moles of solute particles are present in 1 mL of each of the following aqueous solutions?
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<h3>What is mole and atoms?</h3>

The number of atoms or other particles in a mole is the same for all substances. The mole is related to the mass of an element in the following way: one mole of carbon-12 atoms has 6.02214076 × 1023 atoms and a mass of 12 grams.

<h3>Why is the mole unit so important?</h3>

It represents the link between the microscopic and the macroscopic, especially in terms of mass. A mole of a substance has the same mass in grams as one unit (atom or molecules) has in atomic mass units.

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