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Bess [88]
3 years ago
13

How did Ptolemy's model of the solar system explain the apparent changes in speed and direction of the planets?

Chemistry
1 answer:
strojnjashka [21]3 years ago
5 0

Answer:C. Then plants spun on epicycles

Explanation:don't have one I just checked through it on my screen.

Hope it helps

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A___________ consists of a mixture of graphite powder (a form of carbon) and clay that is baked and hardened and encased in wood
Harlamova29_29 [7]

Answer:

A_____PENCIL______ consists of a mixture of graphite powder (a form of carbon) and clay that is baked and hardened and encased in wood or paper. a. silverpoint b. pencil c. charcoal d. chalk e. paste

Explanation:

A pencil is a writing material, where the graphite is what gives the black color to the writing stroke.

5 0
2 years ago
A gaseous fuel mixture stored at 747 mmHg and 298 K contains only methane (CH4) and propane (C3H8). When 11.1 L of this fuel mix
Alisiya [41]

Answer:

M_f=38.8\%

Explanation:

From the question we are told that:

Pressure P=747mmHg

Temperature T=298K

Volume V=11.1

Heat Produced Q=780kJ

Generally the equation for ideal gas is mathematically given by

 PV=nRT

 n= (747/760) *11.1/ (0.0821*298)

 n=0.446mol

Therefore

 x+y=0.446

 x=0.446-y .....1

Since

Heat of combustion of Methane=889 kJ/mol

Heat of combustion of Propane=2220 kJ/mol

Therefore

 x(889) + y(2220) = 760 ...... 2

Comparing Equation 1 and 2 and solving simultaneously

 x=0.446-y .....1

 x(889) + y(2220) = 760 ...... 2

 x=0.173

 y=0.273

Therefore

Mole fraction 0f Methane is mathematically given as

 M_f=\frac{x}{n}*100\%

 M_f=\frac{1.173}{0.446}*100\%

 M_f=38.8\%

7 0
3 years ago
A 48.3 mL sample of gas in a cylinder is warmed from 22 °C to
goldenfox [79]

Answer:

58.94 mL

Explanation:

V1 = 48.3 mL             V2 = v mL

T1 = 22 degree celsius OR 295 k         T2 = 87 degree celsius OR 360 k

We will use the gas equation:

PV = nRT

Since the Pressure (p) , number of moles (n) and the universal gas constant(R) are all constants in this given scenario,

we can say that

V / T = k , (where k is a constant)

Since this is the first case,

V1 / T1 = k --------------------(1)

For case 2:

Since we have the same constants, the equation will be the same

V / T = k (where k is the same constant from before)

V2 / T2 = k (Since this is the second case) ------------------(2)

From (1) and (2):

V1 / T1 = V2 / T2

Now, replacing the variables with the given values

48.3 / 295 = v / 360

v = 48.3*360 / 295

v = 58.94 mL

Therefore, the final volume of the gas is 58.94 mL

4 0
3 years ago
Help me pleaseee
telo118 [61]

Answer: 11.25 moles of O_2 will be required to completely react with 2.25 moles of C_3H_8.

Explanation:

The balanced chemical equation is:

C_3H_8(g)+5O_2(g)\rightarrow 3CO_2(g)+4H_2O(g)  

According to stoichiometry :

1 mole of C_3H_8 require = 5 moles of O_2

Thus 2.25 moles of C_3H_8 will require=\frac{5}{1}\times 2.25=11.25moles  of O_2  

Thus 11.25 moles of O_2 will be required to completely react with 2.25 moles of C_3H_8.

3 0
3 years ago
The goal of bonding is to reach stability by reaching an octet of valence electrons
Artemon [7]
The correct answer is a
8 0
3 years ago
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