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3 years ago

A student uses an indicator to measure the pH of a solution. The indicator shows a pH of 7. What must be true of this solution?

2 answers:

8 0

A pH of 7 is known as "natural"

A pH below 7 is an acid

A pH above 7 is a base

Acids give up hydrogen ions, shown as H+
Bases accept H+, hydrogen ions.

Equilibrium is when a chemical reaction doesn't favor the reactants or products and can go in reverse.
pH of 7 are related to Equilibrium.

With the info I have given you, it's obviously not one of the last 2 you listed.

pH measures the alkalinity and acidity of a solution by the Hydrogen ions, H+. Therefore, the solution has to have Hydrogen ions to react/be measured by the pH paper.

Therefore, your answer is the 2nd statement.
The solution has equal amounts of hydronium ions and hydroxide ions.

zloy xaker [14]3 years ago

4 0

Answer:

The solution has equal amounts of hydronium ions and hydroxide ions.

Explanation:

From the very beginning it is clear that answer choices 3 and 4 are incorrect, as a pH of 7 means it is neutral.

The pH of anything being 7 (neutral) means it is neither an acid (1-6) nor a base (8-14).

This essentially levels things out meaning that there will be an equal amount.

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When you have two like charges in a line â where is the electric field the greatest? is there ever a point where the field will

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The magnitude of the electric field will be the greatest at the point where it is closest,to its charges.

Yes ,there is a point where the field will be zero.

what is an electric field?

The region where an electrostatic force is experienced by a charged entity is known as the electric field at a point.

As per the principle of field lines and vectors,where the field lines are in a close manner together,the field will be strongest.However ,where the field lines are in a manner apart,the field will be the weakest.

As per the concept,the electric field will be the greatest at the point where it is closest to its charges.For like charges, the electric field will be zero closer to the smaller charge and will be along the line joining the two charges. For opposite charges of equal magnitude, there will not be any zero electric fields.

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2 years ago

Example: A wooden crate with mass 100kg is at rest on a stone floor. You know that the coefficients of kinetic and static fricti

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Answer

Any force greater 490N

Explanation

The force required just to make an object slide over a rough horizontal surface is any force greater that the static friction which given by;

$F=\mu_s mg.............(1)$

Given;

$\mu_s=0.5\\m=100kg\\g=9.8m/s^2$

Hence;

F = 0.5 x 100 x 9.8

F = 490N.

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In this problem, we were only asked to find the minimum force required to make the object move which we have done.

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In the diagram, q1 = +6.60*10^-9 C and q2 = +3.10*10^-9 C. Find the magnitude of the total electric field at point P. pls help?

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Answer:

|E(t)| = 1258,46 [N/C]

α = 67,5⁰ (angle with respect x-axis)

Explanation:

E(t) Electric Field is a vector, so we need to determine module and direction

E(t) = E(q₁) + E (q₂) Where E(q₁) and E (q₂) are electric fields due to electric charge q₁ and q₂ respectively.

E(q₁) = K * q₁/ (d₁)² K = 9 *10⁹ [N*m²/C²] d₁ = 0,350 m

E(q₁) = 9 *10⁹ * 6,6*10⁻⁹ / 0,1225 [N*m²/C²] *C/m²

E(q₁) = 484,9 [N/C]

E(q₂) = 9 *10⁹ * 3,1*10⁻⁹ / 0,024025

E(q₂) = 1161,29

Then

|E(t)| = √ |Eq₁|² + |Eq₂|²

|E(t)| = √ ( 484,9)² +( 1161,29)²

|E(t)| = √ 235128 + 1348594,46

|E(t)| = 1258,46 [N/C]

And tanα = 1161,29/484,9 tanα = 2,395 α = 67,5⁰

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