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konstantin123 [22]
3 years ago
7

Students learned that objects can exert forces on other objects without touching. Which three investigations will provide eviden

ce what they have learned. a measuring how close a soda can must be before it rolls toward a balloon that has been rubbed
Chemistry
1 answer:
irinina [24]3 years ago
6 0

Answer:

b

Explanation:

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PLEASE HELP ME!!!! Which energy graph represents the nonspontaneous transition of graphite into diamond?
Viefleur [7K]

Answer:

A picture .There is high reactions in progression still the energy reaction reduced to indicate complete reaction.

4 0
3 years ago
iron is made by a reduction of iron oxide with carbon monoxide. Fe2O3+3CO-2Fe+3CO2. Calculate the mass of iron that can be forme
lyudmila [28]

Answer:

Mass = 88.12 g

Explanation:

Given data:

Mass of iron oxide = 126 g

Mass of iron formed = ?

Solution:

Chemical equation:

Fe₂O₃ + 3CO    →      2Fe + 3CO₂

Number of moles of iron oxide:

Number of moles = mass/molar mass

Number of moles = 126 g/ 159.69 g/mol

Number of moles = 0.789 mol

Now we will compare the moles of iron with iron oxide.

                      Fe₂O₃           :             Fe

                         1                 :               2

                   0.789              :            2/1×0.789 = 1.578 mol

Mass of iron:

Mass = number of moles ×molar mass

Mass = 1.578 mol × 55.84 g/mol

Mass = 88.12 g

4 0
2 years ago
A solution is made by adding 20 g table salt to 100 mL water. The solubility of salt is 36 g/100 mL water. Which term best descr
marysya [2.9K]

Answer:

We say that the solution is unsaturated.

Explanation:

If the salt solubility is 36 g in 0.1 L of water then we can dissolve 360 g of salt in 1 L of water.

Because the solution contains 200 g of salt in 1 L of water, the solution is unsaturated because more salt can be added until we reach the saturation point.

We call the solution dilute when we compare the concentration of a solution with the concentration of another solution, but here we do not compare different solutions.

3 0
2 years ago
Read 2 more answers
Wave Properties
konstantin123 [22]

Answer:

f = 80  flutter/ second

T= 0.0125 sec

Explanation:

Given data:

Fluttering of wings = 4800 time per minute

Frequency of wings = ?

Period for one wing in sec = ?

Solution:

There are 60 seconds in one minute, thus frequency of wings

4800/60 = 80  flutter per second

Period:

T = 1/f

T = 1/80

T= 0.0125 sec

3 0
3 years ago
Read 2 more answers
Are the noble gases considered inert or reactive? Why?
mr Goodwill [35]

Answer:

Noble gases are considered as Inert because they are unreactive.

Explanation:

Seven noble elments are known to us , they are: helium, neon, argon, krypton, xenon, radon, and oganesson. Noble gases have 8 electrons in their outermost shell and hence their valence shell is complete, they donot need further electrons to complete their octet so they are unreactive. Also they posses following properties.

8 0
3 years ago
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