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3 years ago

How long does it take for the moon to make one revolution around Earth?

Chemistry

1 answer:

ycow [4]3 years ago

8 0

Answer:

27 days, 7 hours and 43 minutes.

Explanation:

To complete a full orbit around Earth, it takes 27 days, 7 hours and 43 minutes for the Moon. This is called sidereal month and is measured by the Moon's position relative to distant *fixed" stars.

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A 0.885 M solution of KBr whose initial volume is 82.5 mL has more water added until its concentration is 0.500 M. What is the n

4vir4ik [10]

Answer:

$V_2=146mL$

Explanation:

Hello there!

In this case, since the equation for the calculation of dilutions is:

$M_1V_1=M_2V_2$

Whereas M is the molarity and V the volume, because the final concentration is lower than the initial. Thus, since we are asked to calculate the final volume, we solve for V2 as follows:

$V_2=\frac{M_1V_1}{M_2}=\frac{0.885M*82.5mL}{0.500M}\\\\V_2=146mL$

Best regards!

4 0

3 years ago

A student carried heated a 25.00 g piece of aluminum to a temperature of 100°C, and placed it in 100.00 g of water, initially at

lawyer [7]

Answer: The final temperature of the system is 14.60°C

Explanation:

When metal is dipped in water, the amount of heat released by metal will be equal to the amount of heat absorbed by water.

$Heat_{\text{absorbed}}=Heat_{\text{released}}$

The equation used to calculate heat released or absorbed follows:

$Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})$

$m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)]$ ......(1)

where,

q = heat absorbed or released

$m_1$ = mass of aluminium = 25.00 g

$m_2$ = mass of water = 100 g

$T_{final}$ = final temperature = ?°C

$T_1$ = initial temperature of aluminium = 100°C

$T_2$ = initial temperature of water = 10°C

$c_1$ = specific heat of aluminium = 0.900 J/g°C

$c_2$ = specific heat of water= 4.18 J/g°C

Putting values in equation 1, we get:

$25\times 0.900\times (T_{final}-100)=-[100\times 4.18\times (T_{final}-10)]$

$T_{final}=14.60^oC$

Hence, the final temperature of the system is 14.60°C

3 0

3 years ago

Question 9 (1 point)

pantera1 [17]

Answer:

8 moles of C

Explanation:

From the question given above, the following equation was obtained:

3A + 2B —> 6C

From the equation above,

3 moles of A reacted to produce 6 moles of C.

Thus, the number of mole of C produced by reacting 4 moles of A can be obtained as follow:

From the equation above,

3 moles of A reacted to produce 6 moles of C.

Therefore, 4 moles of C will react to produce = (4 × 6)/3 = 8 moles of C

Thus, 8 moles of C can be obtained from the reaction of 4 moles of A with excess B

6 0

3 years ago

Twelve grams of carbon combine chemically with 4 grams of hydrogen to produce a

Eddi Din [679]

Answer:

Empirical Formula = C₁H₄ or CH₄

Explanation:

Data Given:

Mass of C = 12.0 g

Mass of H = 4 g

Step 1: Calculate Moles of each Element;

Moles of C = Mass of C ÷ At.Mass of C

Moles of C = 12.0 ÷ 12.0

Moles of C = 1.0 mol

Moles of H = Mass of H ÷ At.Mass of H

Moles of H = 4.0 ÷ 1.0

Moles of H = 4.0 mol

Moles of O = %O ÷ At.Mass of O

Moles of O = 53.924 ÷ 16.0

Moles of O = 3.370 mol

Step 2: Find out mole ratio and simplify it;

C H

1.0 4.0

1.0/1.0 4.0/1.0

1 4

Hence,

Empirical Formula = C₁H₄ or CH₄

6 0

3 years ago

Which of the following does NOT state what the arrow means in a chemical equation? a. produces b. yields c. forms d. conserves

Tanya [424]

the answer should be B!

7 0

3 years ago

Read 2 more answers