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jeyben [28]
3 years ago
15

Brainllest! Why are they called hot air balloons and not cold air balloons? Be sure to use the terms density, volume, and mass i

n your answer.
Chemistry
1 answer:
Feliz [49]3 years ago
7 0
Hot air balloons have hot air inside them, which is less dense as the air around it. Thus it rises. A cold air balloon would sink because the air would be more dense than the air around it. Also, the balloon’s volume would vary in size depending on the weight of the balloon.
You might be interested in
List the spectator ions in the following reaction.
Rudik [331]

Answer:

2Na⁺ (aq) and 2OH⁻(aq)

Explanation:

Spectator ions:

Spectator ions are those ions which are same on both side of chemical reaction. These ions are same in the reactant side and product side. Their presence can not effect the chemical equilibrium that's why when we write the net ionic equation these ions are neglect or omitted.

Given ionic equation:

Ba⁺²(aq) + 2OH⁻(aq) + 2Na⁺ (aq) + CO²⁻₃(aq) → BaCO₃(s) + + 2Na⁺ (aq) + 2OH⁻(aq)

In given ionic equation by omitting the spectator ions i.e, 2Na⁺ (aq) and 2OH⁻(aq)  net ionic equation can be written as,

Net ionic equation:

Ba⁺²(aq) + CO²⁻₃(aq) → BaCO₃(s)

4 0
3 years ago
The speed of light in a vacuum is 2.998 × 10 8 8 m/s. How long does it take for light to circumnavigate the Earth, which has a c
svp [43]

Answer:- 0.134 seconds

Solution:- The speed is given as 2.988*10^8\frac{m}{s} and the circumference is 24900 miles which is same as the distance light have to covered. It asks to calculate the time required to cover this distance by the light.

We need to do unit conversion from miles to meter as the speed is given in meter per second.

1 mile = 1609.34 meter

So, 24900mile(\frac{1609.34meter}{mile})

= 40072566 meters

Know that, speed=\frac{distance}{time}

It's rearranged to time as, time=\frac{distance}{speed}

Let's plug in the values in it:

time=\frac{40072566meter}{2.988*10^8\frac{meter}{second}}

= 0.134 seconds

So, the light would take 0.134 seconds to travel the mentioned speed. The answer without the unit is 0.134.

8 0
3 years ago
Biochemistry The famous Anfinsen protein folding experiment was the first to show that the amino acid sequence of a protein can
OverLord2011 [107]

Answer:

The A option is the correct answer: Non-native disulfide bonds form after beta-mercaptoethanol is removed, so the protein cannot refold correctly

Explanation:

Beta-Mercaptoehanol is responsible to reduce the four disulfide bonds present in ARNase; Urea deals with non covalente bonds.  In presence of both ARNase is denatured.

If Urea is first removed by dialysis, and later is removed Beta-Mercaptoethanol, the enzyme recovers ist activity.

If Beta-Mercaptoethanol is first removed, disulfide bonds different from native use to be formed.  As a result ARNase is not an active enzyme

5 0
3 years ago
Isaac read 32% of oeople owned dogs what fraction of people owned dogs
Masja [62]
An easy way to do it is to convert the percentage to a decimal, in this case, .32

Then, multiply that by the amount of people.

An equation would be, .32*p=
Hope this helped :)
3 0
3 years ago
Read 2 more answers
The equilibrium constant for the reaction of fluorine gas with bromine gas at 300 K is 54.7 and the reaction is: Br2(g) + F2(g)
Nezavi [6.7K]

Answer:

The equilibrium concentration of fluorine 0.027 mol/L

Explanation:

This is the equilibrium reaction:

               Br₂(g)   +    F₂(g)    ⇄   2 BrF(g)

Initially    0.127         0.127               -

Intially we have 0.127 moles in both reactants.

React          x                x                  2x

Some amount (x) has reacted. As ratio is 1:2, we have double x in BrF.

So in equilibrium we have 2x of BrF (initially we don't have anything), and 0.127 - x of reactants.

Eq          0.127-x        0.127-x           2x

Let's make K expression:

K = [BrF]² / [Br₂] . [F₂]

54.7 = (2x)² / (0.127-x) . (0.127-x)

54.7 = 4x² / (0.127-x)²

54.7 = 4x² / (0.127² - 2. 0.127x + x² )

54.7 (0.127² - 0.254x + x²) = 4x²

0.882 - 13.89x + 54.7x² = 4x²

0.882 - 13.89x + 54.7x² - 4x² = 0

0.882 - 13.89x + 50.7x² = 0

a = 50.7

b = -13.89

c = 0.882

Let's replace the values in the quadratic formula

(-b +-√(b²-4ac)) / (2a)

-(-13.89) +- √ ((-13.89)² - 4 . 50.7 . 0.882)) /  2. 50.7

x₁ = 0.173

x₂ = 0.1

We addopt 0.1 as the result, because 0.127 - 0.173 is a negative number, it can't be possible a negative concentration

In equilirium

[Br₂] ; [F₂] = 0.127 - 0.1 = 0.027

[BrF] = 0.1 .2 = 0.2

4 0
3 years ago
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