Looking at the solubility curve above for KClO3, at 30 degrees Celsius how many grams will dissolve to make a saturated solution?

A. about 120 g (WRONG ANSWER)

B. 37 g

C. 10 g

D. 5 g


2. KCl is used to test the factors that affect the rate of dissolution.

Investigation 1 data:

Trial Number Temperature (oC) Stirring Dissolving Time (minutes)

1 20 no 30

2 40 no 20

3 60 no 10

How should the student design investigation 2 to finish testing the factors that affect the dissolving rate of KCl?

ANSWER: Keep the temperature at 20°C. Stir the solution.


3.How would you increase the conductivity of a solution?

A. Increase the temperature of the solution.

B. Use a weaker acid or base to make the solution.

C. Increase the concentration of ions in the solution.

D. Decrease the concentration of ions in the solution. (WRONG ANSWER)


4. Match what you know about the above solutions and their conductivity.

A solution like solution A that can conduct electricity ---- ELECTROLYTE

Solution B could have this dissolved in it------BOTH

Solution A could have this dissolved in it------ SALT, ACID, BASE


5. Sugar is added to tea to make sweet tea. In chemical terms, the sugar is the ___________ and the tea (mostly water) is the ____.

ANSWER: SOLUTE, SOLVENT


6. According to the pH chart, which is the strongest base?

ANSWER: NaOH


7.

Bleach

Hand Soap

Ammonia

What property do all three of these common household substances have in common?

When dissolved in water, they release hydrogen ions.

They all turn red litmus blue.

The react with metals to form hydrogen gas.(WRONG ANSWER)

They are all sour.


8. Match each to below to the area in which it belongs in the VENN diagram.

acid, base, or both

changes color in an indicator -- _____(Base is the wrong answer for this one)

Yields OH- ions in solution -- BASE(CORRECT)

pH is below 7---------------------ACID (CORRECT)

tastes sour------------------------ACID(CORRECT)

can conduct electricity in water- _____(Acid is the wrong answer for this one)


9. Use the information on the solubility graph to answer the question.

If 100 grams of the salt KBr are added to 100 g of water at 20oC, how would you describe the concentration of the solution?

ANSWER: SUPERSATURATED


10. What two products result from the neutralization reaction of an acid and a base?

For example: HCl + NaOH --> _____ + ______

ANSWER: SALT AND WATER


11. Jason is making lemonade and is getting impatient waiting for the sugar to dissolve. How can he speed up the rate of dissolution of the sugar?

A. Break up the sugar so the particle size is smaller.

B. Agitate the lemonade solution.

C. Add additional solute.

D. Increase the temperature of the lemonade. Then add ice to cool it back down so it doesn't taste bad.

Choose ALL correct answers.

CORRECT ANSWER: Increase the temperature of the lemonade. Then add ice to cool it back down so it doesn't taste bad.


12. How quickly will a mint dissolve?

Solute Time to dissolve (seconds)

mint cut in half, not swirled 140

mint cut in half, swirled 70

whole mint, not swirled 200

whole mint, swirled ?

mint cut into small pieces, not swirled 50



Students were asked to place a mint in their mouths and determine how long it took for the mint to dissolve. The condition of the mint varied in each student group.

One group of students were asked to leave a whole mint in their mouth, not moving it around, and let it dissolve. Another group swirled a whole mint around in their mouths, while the other groups used mints broken into smaller pieces. See the chart for all of the manipulated variables.


After reviewing that data table, what kind of result would you predict for the swirled, whole mint?


between 20 and 30 seconds

between 160 and 220 seconds

between 80 and 100 seconds

between 40 and 60 seconds(Incorrect answer)

HINT: Notice how the time changes when comparing the mint that has been cut in half. How does the time change when the students swirl that one around?


13. You are pulling your little sister along in a wagon. You exert 45 Newtons and are able to pull her 20 meters. How many joules of work did you do? Remember to consult your equation sheet for this one!


HINT: Did you find the work equation on your equation sheet? Work = force x distance? Take a look at the equation sheet and find it on there. Do you see how the F and d are next to each other? That means you will multiply the force and the distance.

1.00 kg of ice at -24.0°C is placed in contact with a 1.00 kg block of a metal at 5.00°C. They come to equilibrium at -8.88°C.

We can use the principle of conservation of heat to solve this problem. The heat lost by the metal must equal the heat gained by the ice.

The heat lost by the metal is given by

Q1 = m1c1ΔT1

Where m1 is the mass of the metal, c1 is its specific heat, and ΔT1 is the change in temperature.

The heat gained by the ice is given by

Q2 = m2c2ΔT2

Where m2 is the mass of the ice, c2 is its specific heat, and ΔT2 is the change in temperature.

Since the two objects come to thermal equilibrium, we can set Q1 equal to Q2

m1c1ΔT1 = m2c2ΔT2

Solving for c1, we get

c1 = m2c2ΔT2 / (m1ΔT1)

By putting these values we get

c1 = (1.00 kg)(2.06 kJ/kg·K)(-24.0°C - (-8.88°C)) / [(1.00 kg)(5.00°C - (-8.88°C))]

c1 = 0.902 kJ/kg·K

Hence, the specific heat of the metal is 0.902 kJ/kg·K.

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Answer:

Answer:  12

1 mole of H2O contains  1 mole of H and 2 moles of O

That means that are 3 molecules in 1 mole of H2O

The stretching force acting on the second wire, given the data is 588 N

F₁ / r₁ = F₂ / r₂

450 / 3.9×10⁻³ = F₂ / 5.1×10⁻³

cross multiply

3.9×10⁻³ × F₂ = 450 × 5.1×10⁻³

Divide both side by 3.9×10⁻³

F₂ = (450 × 5.1×10⁻³) / 3.9×10⁻³

F₂ = 588 N

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The total momentum of the system is 2.14i + 21.27j.

A vector quantity with both direction and magnitude is momentum. Kg m/s (kilogram meter per second) or N s serve as its units (newton second).

The total starting momentum of a system must match the entire final momentum of the system since momentum is a conserved quantity. The overall momentum does not change.

The total momentum of the system is defined as follows:

As momentum is vector quantity and vectors can be added, so, the momentum of a system is given by

P = Pₓ + P'

where Pₓ is the x-component of momentum

P' is the y-component of the momentum

Also, we know that

P=mv

where m is mass

v is velocity

Thus,

P = Pₓ + P'

P = m₁vₓ + m₂v'

vₓ is the x-component of the velocity

v' is the y- component of the velocity

Given, m₁= 3.2kg

m₂ = 2.9kg

Now,

P = 3.2 (2.3i + 4.2j) + 2.9 (-1.8i +2.7j)

P = (7.36i + 13.44j) + (-5.22i + 7.83j)

P = 2.14i + 21.27j

Thus, the total momentum of the given system is 2.14i + 21.27j.

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Answer: a

Explanation:

Answer: 5

Explanation: If you use a real graph it could be easier to check, but here’s it the easy way.

You start at 0, add 3 as you are going right on the right , subtract 4 as you are going left, then again add 6 as you are going right, and you should get 5.

0+3= 3

3-4= -1

-1+6= 5

Answer:

An object can only accelerate if its speed or velocity is changing. If an object's speed is constant, then its velocity may still be changing if its direction of motion is changing. For example, if a car is driving in a circular path at a constant speed, its velocity will be constantly changing direction as it follows the curvature of the road. In this case, the car would be accelerating, even though its speed is constant. Similarly, if an object's velocity is constant (meaning that both its speed and direction of motion are not changing), then it cannot be accelerating.

I hope this helps to clarify the distinction between speed and velocity, and how they relate to acceleration. Let me know if you have any further questions!

Based on the findings above, the accurate statements are:

The information that all three institutions gathered is quite similar with their results showing a range of annual temperature deviation of 0.05°C in 2010.

However, this data is not enough to say that temperatures are rising gradually because there is no information on temperatures from the previous years.

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Answer:25N/

Explanation:

Answer:

The solar potential in Nepal is 50,000 terawatt-hours per year, which is 100 times larger than Nepal's hydro resource and 7,000 times larger than Nepal's current electricity consumption. Solar can easily meet all future energy needs in Nepal. Solar energy is cheaper than fossil fuels, nuclear and hydro.

Answer:

The correct answer is - 93.24×10^4 kg/m^3.

Explanation:

Given:

height of cylinder: 50.5 mm

diameter = 52.0

then radius will be diameter/2 = 52/2 = 26

Formula:

Density = mass/ volume

Volume = πr^2h

solution:

Now the volume of a cylinder is v = (22/7)×r^2×h

= 22/7×26×26×50.5

= 107261.59 mm^3  

Now volume in cubic meter V =10.7261 ×10^(-5) m^3

So density d = m/V = 1/(10.7261 ×10^(-5))

Or d = 93.24×10^4 kg/m^3

Answer:

im pretty sure the answer is A. up but im not 100% sure

Answer:

Reading a modern clock face

Explanation:

In the analog clock, the minute hand is on "14" minutes, and the hour hand is moving from "12" to "1" - this indicates a time of 12:14.

Answer: Similarity

By.

Answer: MAGNITUDE AND DIRECTION OF A VECTOR

Explanation: Given a position vector →v=⟨a,b⟩,the magnitude is found by |v|=√a2+b2. The direction is equal to the angle formed with the x-axis, or with the y-axis, depending on the application.

Answer:

Photovoltaic detection is a technique that converts light into electrical energy. It is a process that involves the use of a photovoltaic cell, which is made up of semiconductor materials, to generate an electric current when exposed to light.

The photovoltaic cell absorbs the photons of light, which then knock electrons out of their orbits, creating a flow of electricity. The amount of electricity produced is proportional to the intensity of the light. The photovoltaic cell is commonly used in solar panels to generate electricity from sunlight. The efficiency of the photovoltaic cell is dependent on several factors, including the type of semiconductor material used, the purity of the material, and the thickness of the cell.

The photovoltaic cell has many applications, including in solar power generation, telecommunications, and remote sensing. The technique of photovoltaic detection is an important area of research, as it has the potential to provide a clean and renewable source of energy that can help mitigate climate change.

Learn more about Photovoltaic detection

The acceleration of the bicyclist on the hill is 1.32 m/s².

The acceleration of the bicyclist on the hill is calculated by applying the following kinematic equation as shown below.

vf² = vi² + 2ah

where;

make a the subject of the formula and solve for the acceleration;

2ah = vf² - vi²

a = (vf² - vi²) / (2h)

a = (15.9² - 2.59²) / (2 x 46.6)

a = 1.32 m/s²

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On one cookie containing 50 calories, you could potentially go approximately 298 meters

Given that one food calorie is equivalent to 4184 joules, we can calculate the total energy in joules contained in the 50 calorie cookie:

50 food calories * 4184 J/calorie = 209,200 joules

Assuming an average efficiency of around 25% (meaning 25% of the energy is effectively used for movement), and a body weight of 70 kilograms, we can use a rough estimation that it takes about 1 joule of energy to move 0.4 meters (based on the energy cost of walking).

Distance = (Energy obtained from the cookie * Efficiency) / (Energy cost per meter * Body weight)

Distance = (209,200 J * 0.25) / (1 J/m * 0.4 m/kg * 70 kg)

Distance ≈ 298 meters

Therefore, on one cookie containing 50 calories, you could potentially go approximately 298 meters

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Answer:

The bag of sand

Explanation:

I think it is the bag of sand because according to the definition of impulse, impulse is the average force acting on a particule when an external force is being acted on it.

The frictional force may have a magnitude that is equal to or less than sn.

Static denotes being still. Static friction is the friction that exists between two surfaces that are in contact when there is no relative motion between them. It is a force that self-adjusts.

The frictional force that exists between surfaces while they are at rest in relation to one another is known as static friction. When a tiny amount of force is applied, the static force's magnitude is identical in the other direction.

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Answer:

a)  U = 506 J, b)  U = 37.11 J, c) U = 0

Explanation:

The gravitational power energy is given by the expression

         U = m g (y -y₀)

In general, a reference system is set that allows the expression to be simplified, in this case let's assume the reference system at the child's lowest point, therefore y₀ = 0

Let's use trigonometry to find the child's height

          h = y = L - L cos θ

we substitute

           U = m g L (1 - cos θ)

a) when the chain is horizontal θ = 90 and cos 90 = 0

           U = mg L

weight and mass are related

            W = mg

            m = W / g

           U = 230 2.20

           U = 506 J

b) θ = 33.0º

           cos 33 = 0.83867

           U = 230 (1 - 0.83867)

           U = 37.11 J

c) in this case θ = 0 cos 0 = 1

            U = 0

Answer:

the wavelength will decrease

Explanation:

If the frequency of a wave increases, the wavelength will decrease. This is because the speed of the wave is constant for a given medium, so if the frequency (the number of waves passing a fixed point per second) increases, then the distance between successive wave crests (i.e., the wavelength) must decrease to maintain a constant speed. This relationship is described by the wave equation:

v = f λ

where v is the speed of the wave, f is the frequency, and λ is the wavelength. If v is constant and f increases, then λ must decrease to keep the equation balanced.

Answer:

The characteristics that determine how easily two substances change temperature are:

The volume and density of the substances and the amount of time they are in contact do not directly affect how easily they change temperature.

Explanation:

When positive and negative charges of a copper wire are moving horizontally within a time interval of 10 microseconds, the magnitude of the current is zero, and the direction of the current is opposite to the direction of charge movement.

In the given scenario, if positive and negative charges of a copper wire are moving horizontally within a time interval of 10 microseconds (10 μs), we can infer the following about the magnitude and direction of the current:

1. Magnitude of the Current: The magnitude of the current is determined by the total charge passing through a given point in the wire per unit time. Since both positive and negative charges are moving, the total charge passing through a point will be the sum of the magnitudes of the charges. If the number of positive and negative charges is equal, the magnitudes of their charges will also be equal. Therefore, the total charge passing through the point will be the sum of equal positive and negative charges, resulting in a net charge of zero. In this case, the magnitude of the current will be zero.

2. Direction of the Current: The direction of the current is determined by the flow of positive charges. In a copper wire, the positive charges are not free to move. Instead, it is the negatively charged electrons that are free to move. Due to conventional current flow convention, the direction of the current is considered opposite to the direction of the electron flow. Therefore, even though both positive and negative charges are moving horizontally, the direction of the current will be in the opposite direction to the movement of the charges.

In summary, in the given scenario, where positive and negative charges of a copper wire are moving horizontally within a time interval of 10 microseconds, the magnitude of the current is zero, and the direction of the current is opposite to the direction of the charge movement.

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Answer:

The object moving in a straight path is called linear or rectilinear motion.

An object is said to be in rectilinear motion if it changes its position,along a straight line path.

Explanation:

example: A car moving in a straight road.

A jet moving straight in air

Answer:

The acceleration would be 10m/s.

Explanation:

To find this out, use the formula:

A = speed/time:

30 divided by 3 = 10m/s.

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Based on the information given, it can be posited that Kyle has a general anxiety disorder.

Generalized Anxiety Disorder is a disorder that is characterized by persistent and excessive worry about different things. People with the disorder may anticipate disaster and are concerned about money, health, family, or other issues.

Some of the effective ways of treatment are spending more time with family and friends, doing regular exercises , enough sleeping, etc.

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Answer: what ( younger brothers of hers )

Explanation:

K bye

Answer:

Explanation:

Carbonation. When you think of carbonation, think carbon! ...

Oxidation. Oxygen causes oxidation. ...

Hydration. This isn't the hydration used in your body, but it's similar. ...

Hydrolysis. Water can add to a material to make a new material, or it can dissolve a material to change it. ...

Acidification.

Answer:

a)this graph is also a line     b) in both cases we have a uniform movement

Explanation:

In this exercise we have a uniform movement

     v = d / t

     d = v t

in the table we give some values ​​to make the graph

       t (s)    d (m)

        1         10

        2        20

        3         30

In the attached we can see the graph that is a straight line

we have another vehicle at v = 50 me / S

t (s)     d (m)

1         50

2        100

3         150

this graph is also a line

b) in both cases we have a uniform movement