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2 years ago

Will an empty balloon have precisely the same apparent weight on a scale as a balloon filled with air? Explain.

2 answers:

4 0

The notion <span>an empty balloon have precisely the same apparent weight on a scale as a balloon filled with air depends on the diameter of the balloon. The weight of the balloon filled with air is equal to the mass of the balloon and the mass of the air inside. The mass of air inside is equal to the density of air multiplied by the volume of the balloon. If the balloon is large, then the two masses are equal whereas if not, the mass of air inside the inflation is neglible</span>

pentagon [3]2 years ago

3 0

<span>They would not, but only for this reason: In the the full balloon, slightly more molecules of air are pressing downwards on the same position. The difference lies in the weight of the volume of the inflated balloon that does not lie in space above the deflated balloon.</span>
An air filled balloon is heavier than the empty one.

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When a variable is determined by a factor outside of the function or model being evaluated, it is said to be A. statistically i

inna [77]

Answer:

The correct answer is B. exogenous

Explanation:

Let us try to describe exogenous and endogenous variables an exogenous variable value is influenced only by factors outside a model or system and is forced onto the model, while a change in an exogenous variable is known as an exogenous change. Also an endogenous variable is one whose value is influenced only by the system or model under study.

4 0

3 years ago

The expected o-c-h angle in this molecule is degrees. the expected hybridization at the central carbon is

WINSTONCH [101]

Each neutral carbon atom contains four valence electrons and may form up to four electron domains. Possible hybridizations include

$sp^{3}$ , four electron domains, as in ethane $\text{C}_2\text{H}_6$
$sp^{2}$ , three electron domains, as in ethene $\text{C}_2\text{H}_4$
$sp$ , two electron domains, as in ethyne $\text{C}_2\text{H}_2$

Molecules of each of the three hybridization demonstrate spatial configurations that would maximizes the separation between the electron domains.

Carbon atoms with a $sp^{3}$ hybridization would demonstrate a tetrahedral configuration with a bond angle of approximately $109.5\textdegree{}$
Carbon atoms with a $sp^{2}$ hybridization would demonstrate a triangular planar configuration with a bond angle of $120\textdegree{}$
Carbon atoms with a $sp$ hybridization would demonstrate a linear configuration with a bond angle of $180\textdegree{}$

Bond angles are characteristic of the spatial configuration of electron domains and identifies the hybridization of the central carbon atom.

Note that each hydrogen atom contains only one valence electron and would form only single bonds. It takes two valence electrons for oxygen atoms to achieve an octet such that each oxygen form only two bonds at a single time. Therefore given the fact that the carbon is bonded to both hydrogen and oxygen, only the following hybridizations are possible

$sp^{3}$ in which the oxygen atom forms a carbon-oxygen double bond with the central carbon atom;
$sp^{2}$ in which the oxygen atom forms a single bond with the central carbon atom and with a second atom.

3 0

2 years ago

20 points! < is what I chose. How did I do?

Zigmanuir [339]

Greenhouse gases released from the burning of fossil fuels are responsible for global warming.

<h3>What is the atmosphere?</h3>

The atmosphere is the region of region of the planet above its surface area where gases envelop the planet.

Based on the effect of greenhouse gases on global warming;

Planet A has a higher surface temperature due to the higher amount of carbon dioxide in the atmosphere since carbon dioxide is a greenhouse gas.

Methane is the main constituent of natural gas. Humans increase the contribute to increase in methane gas by raising cattle,

Pollutants come from both natural sources and human activities.

Sulfur Dioxide is produced by the combustion of fuels in automobiles. Once in the atmosphere, it combine with water to form acid precipitation.

Nitrogen and oxygen do not contribute to the greenhouse effect because they are made up of 2 atom molecules that are bound tightly so they CANNOT vibrate to absorb energy.
Greenhouse gases contribute to global warming by absorbing infrared energy that reflects off Earth's surface and reemitting the energy in all directions. This keeps the infrared energy close to the Earth's surface.

Most of the greenhouse gases produced come from burning fossil fuels in factories, ships, cars, trains.

Therefore, pollutants such as greenhouse gases are responsible for global warming.

Learn more about greenhouse gases at: brainly.com/question/12684997

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8 0

1 year ago

A concentrated koh (mw = 56.105 g/mol) solution is 45.0 %wt koh and has a density of 1.45 g/ml. How many milliliters of the conc

kati45 [8]

The wt% of KOH = 45%

This implies that there is 45 g of KOH in 100 g of the solution

Density of the solution is given as 1.45 g/ml

Therefore, the volume corresponding to 100 g of the solution is

= 100 g * 1 ml /1.45 g = 68.97 ml = 0.069 L

Now concentration of the concentrated KOH solution is:

Molarity = moles of KOH/vol of solution

= (45 g/56.105 g.mol-1)/0.069 L = 11.6 M

Thus,

Initial KOH concentration M1 = 11.6 M

Initial volume = V1

Final concentration M2 = 1.20 M

Final volume V2 = 250 ml

M1*V1= M2*V2

V1 = M2*V2/M1 = 1.20*250/11.6 = 25.9 ml = 26 ml

8 0

2 years ago

A chemist adds 185.0mL of a 2.6 M iron(II) bromide FeBr2 solution to a reaction flask. Calculate the millimoles of iron(II) brom

RUDIKE [14]

Answer:

0.48 moles

Explanation:

The bromide has a molarity of 2.6M.

This simply means that in 1dm^3 or 1000cm^3 of the solution, there are 2.6 moles.

Now, we need to get the number of moles in 185ml of the bromide. It is important to note that the measurement ml is the same as cm^3.

We calculate the number of moles as follows.

If 2.6mol is present in 1000ml

x mol will be present in 185 ml.

To calculate x = (185 * 2.6) ÷ 1000

= 0.481 moles = 0.48 moles to 2 s.f

7 0

2 years ago

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