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3 years ago

Choose the most acidic substance in the group.

Physics

2 answers:

Olenka [21]3 years ago

4 0

It would be lemon juice since it has the lowest pH

liraira [26]3 years ago

4 0

Answer: lemon juice, pH = 2.25

Explanation:

pH is the measure of acidity or alkalinity of a solution.

Acids are the substances which dissociate in water to give $H^+$ ions. Acids have pH raging from 1 to 6.9

$HX\rightarrow H^++X^-$

pH is calculated by taking negative logarithm of hydrogen ion concentration.

$pH=-\log [H^+]$

Thus as pH and $H^+$ are inversely related, a solution having lower pH will have more amount of $H^+$ concentration and thus would be more acidic.

Thus lemon juice with lowest pH of 2.25 will have highest concentration of hydrogen ions and is most acidic.

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Two different liquids are poured into a jar until it is half full. The jar is then sealed shut and shaken. The liquids undergo a

Lilit [14]

Answer:

A closed system.

Explanation:

The three major types of system are: open, closed and isolated. Open system interacts with its surroundings with respect to its particles and energy. A closed system interacts with its surroundings with respect to energy but not its particles. While an isolated system does not interact with its surroundings in any way.

Therefore, after the jar is sealed, it is an example of a closed system. This is because the emitted gas could not escape into the surroundings, but thermal energy was emitted into its surroundings after the chemical reaction has taken place.

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3 years ago

Using the results of Question 1 that would apply if the collision were inelastic, compute (using Excel in the yellow highlighted

ch4aika [34]

Answer:

The fractional kinetic energy will be lost if the collision is inelastic. In inelastic collision, the kinetic energy is converted into other forms of energy.

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Explanation:

During inelastic collision, the kinetic energy of a moving object does not conserve. It changes into another form of energy such as sound energy and heat energy etc.

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3 years ago

Why skies are blue but not other colours

wolverine [178]

Answer:

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Explanation:

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3 years ago

A 4.0 m length of gold wire is connected to a 1.5 V battery, and a current of 4.0 mA flows through it. What is the diameter of t

sladkih [1.3K]

Explanation:

Given that,

Length of gold wire, l = 4 m

Voltage of battery, V = 1.5 V

Current, I = 4 mA

The resistivity of gold, $\rho=2.44\times 10^{-8}\ \Omega-m$

Resistance in terms of resistivity is given by :

$R=\dfrac{\rho l}{A}$

Also, V = IR

So,

$\dfrac{V}{I}=\dfrac{\rho l}{A}$

A is area of wire,

$\dfrac{V}{I}=\dfrac{\rho l}{\pi r^2}$ , r is radius, r = d/2 (diameter=d)

$\dfrac{V}{I}=\dfrac{\rho l}{\pi (d/2)^2}\\\\\dfrac{V}{I}=\dfrac{4\rho l}{\pi d^2}\\\\d=\sqrt{\dfrac{4\rho l I}{V\pi}} \\\\d=\sqrt{\dfrac{4\times 2.44\times 10^{-8}\times 4\times 4\times 10^{-3}}{1.5\times \pi}} \\\\d=18.2\ \mu m$

Out of four option, near option is (C) 17 μm.

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Nesterboy [21]

Answer:

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