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ivann1987 [24]
4 years ago
12

30 POINTS TO WHOEVER CAN FIGURE IT OUT!!When is the sun directly overhead at the equator?

Chemistry
2 answers:
tresset_1 [31]4 years ago
8 0

Answer:

D

Explanation:

The sun is directly overhead at the equator during the vernal (usually March 20) and autumnal (around September 23) equinoxes.

Basically, what happens is that on these two days, day and night practically last for an equal number of hours.

Hope this helps!

Andre45 [30]4 years ago
3 0

Answer:

D) Vernal and autumnal equinoxes.

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Classify the following as a physical property (phys) or a chemical property (chem). (a) Silver metal has a shiny luster. (b) Sil
ANTONII [103]

Answer:

Explanation:

Hello,

The question above requires us to classify certain properties which may either fall into physical or chemical properties of that matter.

Physical properties are properties which are of intrinsic value and has no influence on the chemical nature of the substance while chemical properties are those that influence the chemical nature of the substance.

Physical properties can be measured or calculated while chemical properties of a substance is very difficult to measure.

a). Silver has a shiny luster is an example of "physical property" because the shiny nature of silver has no chemical importance.

b). Silver metal has a density of 10.49 g/cm³ is also a "physical property" because density is a physical property of a material.

Density is ratio between mass and volume which are both physical properties since they can be measured.

c). Silver metal and Chlorine gas produce Silver chloride (AgCl) is a "chemical property" since it involves combining of two elements and they both lose their original chemical identity after the reaction.

d). Silver metal has a melting point of 1235°C is a "physical property"

e). Silver metal conducts electricity is a "chemical property" since conduction of electricity are done by the availability of mobile electrons in its electron cloud.

f) silver metal gives no reaction to acid is also an example of "chemical property"

7 0
3 years ago
What is an intermolecular force?
viva [34]

Answer: a force acting between two different molecules

Explanation:

APEX

4 0
4 years ago
What could I use for 3 examples of chemical exchanges (preferably ones I could do with easily obtained chemicals)?
zheka24 [161]

Answer: (I added a few extra just for fun)

1. Rusting of iron

2. Digestion of food

3. Reaction between salts and acids

4. Boiling an egg

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8 0
3 years ago
Part a how many grams of xef6 are required to react with 0.579 l of hydrogen gas at 6.46 atm and 45°c in the reaction shown belo
Nina [5.8K]
First, let us find the corresponding amount of moles H₂ assuming ideal gas behavior.

PV = nRT
Solving for n,
n = PV/RT
n = (6.46 atm)(0.579 L)/(0.0821 L-atm/mol-K)(45 + 273 K)
n = 0.143 mol H₂

The stoichiometric calculations is as follows (MW for XeF₆ = 245.28 g/mol)
Mass XeF₆ = (0.143 mol H₂)(1 mol XeF₆/3 mol H₂)(245.28 g/mol) = <em>11.69 g</em>
6 0
4 years ago
Plz help with 1 i don’t know what to answer as!!
tamaranim1 [39]

Answer: results are based on a small sample size

Explanation:

the other answers wouldnt make sense

7 0
3 years ago
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