All categories

2 years ago

How can we predict how the moon will change appearance from day to day?

Chemistry

2 answers:

kvv77 [185]2 years ago

7 0

Answer:

1. When you see the moon, think of the whereabouts of the sun

2. The moon rises in the east and sets in the west, each and every day

3. The moon takes about a month (one month) to orbit the Earth

4. The moon’s orbital motion is toward the east

Explanation:

OlgaM077 [116]2 years ago

3 0

Answer:

Explanation:

The slice of sunlight continues to decrease until the moon is a waning crescent and then a new Moon. The whole cycle (from new Moon to new Moon) takes about 29.5 days. If you have a hard time remembering which way the moon phases go, just think: “white on right, getting bright!”

You might be interested in

Which are examples of equilibrium? Check all that apply.

Sveta_85 [38]

I believe that the answers are 3 and 4

4 0

1 year ago

Read 2 more answers

Suppose you have exactly 1 cup (237 g) of hot (100.0 °C) brewed tea in an insulated mug and that you add to it 2.50 × 10² g of i

san4es73 [151]

Answer:

Final Temperature = 298.28 K (25.28°C)

Explanation:

First off, lets least out our parameters (What we were given).

Mass of Tea (Mt) = 237g

Initial temp. of tea (T1) = 100 °C + 273 = 373K (Converting to Kelvin)

Mass of Ice (Mi) = 2.50 × 10² g = 250g

Initial temp. of ice (T1) = -18 °C + 273 = 255K (Converting to Kelvin)

If all the ice melts

Amount of Heat required to melt the ice [H] = Amount of heat required to raise its temperature to 0°C or 273K (Melting point) [H1] + Heat of Fusion [H2]

H1 = MiCΔT

ΔT = T2 - T1 = 255 - 273 = -18K

C = 2.09 J/gK (Specific Heat capacity of Ice)

H1 = 250 * 2.09 * (-18)

H1 = -9405 J

H2 = m·ΔHf

ΔHf = Heat of fusion of ice = 334 J/g

H2 = 250 * 334

H2 = 83500 J

Amount of Heat required to melt the ice [H] = H1 + H2

H = -9405 + 83500 = 74095 J

This means the heat was able to supply 74095 J to the tea.

Final temperature is calculated from:

H = MtCΔT

ΔT = H/MtC

ΔT = 74095/(237 * 4.184)

ΔT = 74095 / 991.61

ΔT = 74.72 K

With a temperature difference of 74. 72 K

Final temperature = Initial temperature - 74.72K

T2 = 373 - 74.74

T2 = 298.28 K (25.28°C)

6 0

2 years ago

Convert 1.71 × 1024 atoms of carbon to moles of carbon.

beks73 [17]

You need to use Avogadro's constant to convert from atoms of carbon to moles of carbon.

1.71*10^24 atoms C * (1 mole/6.022*10^23 atoms) = 2.84 moles of carbon

7 0

2 years ago

Consider the following hypothetical reaction: 2 P + Q â†’ 2 R + S The following mechanism is proposed for this reaction: P + P Q

aleksandr82 [10.1K]

Answer: the answer is option (D). k[P]²[Q]

Explanation:

first of all, let us consider the reaction from the question;

2P + Q → 2R + S

and the reaction mechanism for the above reaction given thus,

P + P ⇄ T (fast)

Q + T → R + U (slow)

U → R + S (fast)

we would be applying the Rate law to determine the mechanism.

The mechanism above is a three step process where the slowest step seen is the rate determining step. From this, we can see that this slow step involves an intermediate T as reactant and is expressed in terms of a starting substance P.

It is important to understand that laws based on experiment do not allow for intermediate concentration.

The mechanism steps for the reactions in the question are given below when we add them by cancelling the intermediates on the opposite side of the equations then we get the overall reaction equation.

adding this steps gives a final overall reaction reaction.

2P + Q ------------˃ 2R + S

Thus the rate equation is given as

Rate (R) = K[P]²[Q]

cheers, i hope this helps

3 0

1 year ago

A mixture of three noble gases has a total pressure of 1.25 atm. The individual pressures exerted by neon and argon are 0.68 atm

vlabodo [156]

Add the Pressure of neon and argon that is 0.68 +0.35= 1.03
Total pressure that is 1.25 -1.03=0.22 atm

5 0

1 year ago

Read 2 more answers