1.
When a basketball player jumps to make a shot, _____.


the force with which he jumps is equal to the force with which he shoots the ball

the downward force on the floor is equal to the upward force on his feet

the forces on the player’s feet and on the floor are both in the upward direction

the action-reaction forces are unequal because they act on different objects

Answer:

Element Symbol Atomic weight Atoms Mass percent

Carbon C                  12.0107               1              23.7894

Hydrogen H         1.00794                3         5.9892

Chlorine Cl                 35.453                 1       70.2213

Explanation:

Final answer:

The percentage of the mass of 1 mole of CH3Cl derived from carbon is 23.79%, which is calculated by dividing the molar mass of carbon by the total molar mass of CH3Cl and multiplying by 100.

Explanation:

To calculate what percentage of the mass of 1 mole of CH3Cl is derived from carbon, we first determine the molar mass of CH3Cl. The molar mass of carbon (C) is approximately 12.01 g/mol, hydrogen (H) is 1.01 g/mol, and for chlorine (Cl), it is approximately 35.45 g/mol. Thus, the molar mass of CH3Cl is calculated as:

Carbon: 12.01 g/mol

Hydrogen: 1.01 g/mol × 3 = 3.03 g/mol

Chlorine: 35.45 g/mol

Adding these together gives the total molar mass of CH3Cl as 50.49 g/mol. To find what percentage of this mass is due to carbon, we divide the mass of carbon by the total molar mass and multiply by 100:

Percentage of carbon = (12.01 / 50.49) × 100 = 23.79%

Therefore, carbon constitutes 23.79% of the mass of 1 mole of CH3Cl.

Answer: A.

Explanation: A chemical reaction is a chemical change that occurs when two or more substances combine to form a new substance . Photosynthesis turns carbon dioxide and water into oxygen and carbohydrates, therefore a chemical change occurs.

Answer:

A. Because a new substance is formed.

Answer: By atomic number

Answer:

According to the atomic number or number of proton

Explanation:

Only half of the moon is lit up as it makes its revolution around the earth.

The surface of the moon reflects the light incident from the sun and that is what makes the moon bright and shiny. While making its revolution around the earth, whatever is its position in the trajectory, only half of its entire surface is facing the sun and thus only half of the moon is lit up; the other half is always on the shadow side.  

What accounts for the differed brightness and shapes as observed from the earth is its position with respect to earth and the sun and this changes each day. When the sun, the earth and the moon all are in a straight line, the moon appears to be the brightest giving a Full moon and when it is between the sun and earth, the lit side is facing opposite to earth and thus it is not visible to us; giving rise to a New moon.  

Answer:

2 atoms leftb

Explanation:

Answer:

1. Double displacement reaction

2. Trisodium phosphate and potassium hydroxide

3. Sodium hydroxide and Potassium phosphate

Explanation:

1)

The given chemical reaction is as follows.

[tex]Na_{3}PO_{4}+KOH\rightarrow NaOH+K_{3}PO_{4}[/tex]

The balanced chemical reaction is as follows.

[tex]Na_{3}PO_{4}+3KOH\rightarrow 3NaOH+K_{3}PO_{4}[/tex]

In the above reaction two reactants are exchange their cations. Therefore, it is a double displacement reaction.

2)

[tex]Na_{3}PO_{4}+3KOH\rightarrow 3NaOH+K_{3}PO_{4}[/tex]

In the above reaction left side of the reaction is considered as reactants.

[tex]Na_{3}PO_{4}[/tex] - Trisodium phosphate

[tex]KOH[/tex] - Potassium hydroxide

3)

[tex]Na_{3}PO_{4}+3KOH\rightarrow 3NaOH+K_{3}PO_{4}[/tex]

In the above reaction right side of the reaction is considered as products.

[tex]NaOH[/tex] - Sodium hydroxide

[tex]K_{3}PO_{4}[/tex] - Potassium phosphate.

Answer:

C

Explanation:

The curie specifies the amount of ionizing radiation energy that is emitted from an unstable isotope as it decays.

Answer:

Unit of radioactive disintegration

Explanation:

Answer:

D)applied

Explanation:

Answer:

i think the answer is unbalanced

Explanation:

Answer: proton

Explanation:

Answer:

The answer is TRUE!!!

Explanation:

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Answer:

Both of them will hit the water at the same time.

Explanation:

The time taken to hit the water is given by:

Let H be the height of the bridge.

[tex]H=ut+\frac{1}{2}gt^{2}\\\\Initial\:Velocity=u=0\\\\H=\frac{1}{2}gt^{2}\\\\t=\sqrt{2gH}[/tex]

The time taken to hit the water does not depend on the weight of the object.

It only depends on the height of the bridge.

Since, both the objects are dropped from the same bridge, they will hit the water at the same time.

Answer:

The mass of an object  is 0.6122 Kg

Explanation:

Given:

Acceleration  = 9.8 m/s

Force  = 58.8 N

To Find:

Mass of an object = ?

Solution:

We know that according to newtons 2nd law

Force is the product of the mass and acceleration

F= ma

where

F = Force

m = mass

a =  Acceleration

Substituting the values,

58.8 = m X  9.8

[tex]m= \frac{58.8}{9.8}[/tex]

m = 0.6122 kg

The middle number in set is called median, D is the answer.

Hope this helps.

Answer:

The difference in mass between 3.01×10^24 atoms of gold and a gold bar with the dimensions 6.00 cm X 4.25 cm X 2.00 cm is :

Difference  in mass = 985.32 - 984.5 = 0.82 g

Explanation:

Part I :

[tex]n =\frac{3.01\times 10^{24}}{6.022\times 10^{23}}[/tex]

n = 4.9983

n = 4.99 moles

(Note : You can also take n = 5 mole )

Molar mass of gold = 196.96 g/mole

This means, 1 mole of gold(Au) contain = 196.96 grams

So, 4.99 moles of gold contain = [tex]5\times 196.96[/tex] g

4.99 moles of gold contain = 984.8 g

Mass of [tex]{3.01\times 10^{24}}[/tex] atoms of gold = 984.5 g

Part II :

Density of Gold = [tex]19.32 g/cm^{3}[/tex]

Volume of the cuboid = [tex]length\times breadth\times height[/tex]

Volume of the gold bar =[tex]6.00\times 4.25\times 2.00[/tex]

Volume of the gold bar = 51[tex]cm^{3}[/tex]

Using formula,

[tex]Density = \frac{mass}{Volume}[/tex]

[tex]Mass = Density\times Volume[/tex]

[tex]Mass = 19.32 \times 51[/tex]

Mass = 985.32 g

So, A  gold bar with the dimensions 6.00 cm X 4.25 cm X 2.00 cm has mass of 985.32 g

Difference  in mass = 985.32 - 984.5 = 0.82 g

Answer:

Frequency = 4.74 × 10¹⁴ Hz

Explanation:

Given data:

Wavelength of light = 633 nm (633 ×10⁻⁹ m)

Frequency of light = ?

Solution:

Speed of light = wavelength × frequency

Frequency = Speed of light / wavelength

Speed of light = 3 × 10⁸ m/s

Frequency = 3 × 10⁸ m/s / 633 ×10⁻⁹ m

Frequency = 0.00474 × 10¹⁷ s⁻¹

Frequency = 4.74 × 10¹⁴s⁻¹

s⁻¹ = Hz

Frequency = 4.74 × 10¹⁴ Hz

The frequency of light with a wavelength of 633 nm is approximately 4.73 x 10^14 Hz. This is obtained by dividing the speed of light by the wavelength.

The frequency of light can be determined using the equation for the speed of light, which states that the speed of light (c) is equal to its frequency (v) multiplied by its wavelength (λ). The formula is expressed as c = λv.

In this case, the speed of light is typically about 3.00 x 10^8 m/s, and the wavelength is given as 633 nm, which is equivalent to 633 x 10^-9 m.

The equation is rearranged to solve for frequency, thus becoming v = c / λ.

Using these values in the formula, we get frequency v as approximately 4.73 x 10^14 Hz. Hence, the correct answer is option (C).

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Answer:

238

Explanation:

To find the atomic mass, you add protons and neutrons

Number of Protons‎: ‎92

Number of Neutrons‎: ‎146

146+92=238

Answer:

C. I, III , IV

Explanation:

As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.

As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.

As the size of atom increases the ionization energy from top to bottom also  decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.

Ionization energy increases across a period and decreases down a group on the periodic table due to changes in atomic radius and nuclear charge. Successive ionization energies for a single element also increase because it's harder to remove each successive electron. There is a significant leap in ionization energy when removing a core electron as opposed to a valence electron.

The ionization energy of an element is the energy required to remove an electron from a neutral atom. Generally, the ionization energy increases across a period and decreases down a group on the periodic table. This is due to variations in atomic radius and nuclear charge. As you move across a period, atomic radius decreases, while nuclear charge increases, making the electrons more tightly bound to the nucleus, thus increasing ionization energy.

When it comes to successive ionization energies for a single element, it increases as it's harder to remove each successive electron. For instance, when you compare IE₁ for Al and IE₁ for Tl, you will find that IE₁(Tl) < IE₁(Al) because the 6p¹ electron from Tl is easier to remove than the 3p¹ electron from Al.

An important trend to remember is that ionization energy significantly increases when removing a core electron compared to a valence electron due to the greater attraction to the nucleus. As a result, the second ionization energy for sodium, for instance, which removes a core electron, is much higher than its first ionization energy which removes a valence electron.

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Answer:

1. A molecule

2. A mixture

3. Concentration

4. Chemical formula

5. Kinetic energy

Explanation:

1. A molecule consists of two or more different types of atoms bonded together.

For this question, it's important to understand that we cannot be too abstract and use terms, such as compound. The reason is simple: molecules consist of atoms, and while molecules produce compounds, the latter can also be ionic. Ionic compounds would contain ions in them rather than atoms. In ionic compounds, electrons are transferred from one atom to the other to form cations and anions.

Molecules, on the other hand, consist of atoms. In fact, those atoms shouldn't necessarily be different: for example, we may have an oxygen gas molecule which consists of two oxygen atoms.

2. A mixture is a combination of different substances that can be separated by physical means.

Usually, mixtures are in the same physical state, for example, we may have a mixture of an aqueous layer, such as water, and an organic layer, such as hexane. In order to separate them, we might use a separation funnel, as water is polar and hexane is non-polar, they will form two separate layers. Collecting the bottom layer in a separate flask from the funnel and then the remaining layer will help us separate them based on their difference in polarity.

3. Many variables in chemistry depend on the amount of water present. Water is a solvent. One of the typical examples is concentration. Concentration, or molarity, is a ratio between the moles of a solute and the volume of a solution. Changing the amount of water would change the concentration of a solute as a result.

E. g., if we evaporate water, our solvent, from a specific solution, the concentration of a solute will increase, as we'll have the same amount of a solute in moles for a lower volume of a solution. Similarly, if we dilute the solution (increase the volume of it by adding more water), the volume will increase and we'll have the same amount in moles of the solute for a greater amount of the solution, so the concentration will decrease.

4. A chemical formula has fixed definite proportions at all times. Regardless of what mass of a compound we have, according to the law of definite proportions, atoms always combine in a fixed ratio in compounds. For example, we know that we would always have two hydrogen atoms and one oxygen atom in a water molecule regardless of what mass of water we have.

Similarly, if we remember ionic compounds, if we take sodium chloride, NaCl, the ionic ratio between sodium and chloride ions is always 1 : 1 (one sodium cation combined with one chloride anion). This is fundamentally true and it's independent of any quantity.

5. Similarly, this is an open question. A typical answer to this would be kinetic energy. Kinetic energy only depends on temperature of a substance. Kinetic energy is the energy of movement: the greater it is, the greater the velocity of an object.

The greater the temperature, the higher the kinetic energy. This direct proportionality is seen from the equation [tex]E_k = \frac{3}{2} kT[/tex], where k is a constant and T is the absolute temperature. Notice that for higher T values, the kinetic energy term is higher.

Thinking about it from the other perspective, density, as another example, also depends on temperature. The greater the temperature, the greater the distances between the molecules, so the density decreases with an increase in temperature.

There are many more thermodynamic examples to look at as well!

Answer: option C - The cells produced at the end of meiosis contain half the number of chromosomes as the parent cell

Explanation:

Meiosis is also known as REDUCTIVE DIVISION, simply because a parent cell with diploid number of chromosome (46) is divided into four daughter cells with haploid number of chromosome (23)

Thus, ONLY option C correctly defines meiosis

At the end of meiosis, produced cells contain half the number of chromosomes as the parent cell. Option C is correct.

Meiosis:

It is division in which cell divide into 4 haploid daughter cells.

Therefore, at the end of meiosis, produced cells contain half the number of chromosomes as the parent cell.

To know more about Meiosis,

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Answer:  We call it "first quarter" because the moon has traveled about a quarter of the way around Earth since the new moon. Waxing gibbous: The area of illumination continues to increase.

Explanation:

the middle of the day and sets around the middle of the night in most areas. In general, people see the First Quarter also A first quarter moon rises around noon and sets around midnight. You'll likely spot it in late afternoon or early evening, high up in the sky. At this moon phase, the moon is showing us precisely half of its lighted half.

To prepare a 0.5 M sucrose solution with a volume of 600 cm³, you would need to dissolve 102.6 grams of sucrose.

How to Calculate the Mass of Sucrose for a Semi Molar Solution

To prepare a semi molar solution, you first need to understand that "semi molar" implies a 0.5 molar concentration of the solute. Given that the molecular mass of sucrose is 342 g/mol, we can proceed with the calculations.

To prepare a 0.5 M solution, 0.5 moles of sucrose per liter of solution are needed. Since the density of a sucrose solution is not provided, we will assume the density of water for this example, which is 1 g/cm³, making 600 cm³ of solution equivalent to 600 mL or 0.6 L.

Now, we calculate the number of moles of sucrose required as follows:

Finally, to find the mass of sucrose:

Therefore, to prepare a semi molar (0.5 M) solution, you would need to dissolve 102.6 grams of sucrose in 600 cm³ of solution.

Final answer:

To make a 0.5 M sucrose solution with a volume of 600 cm³, 102.6 grams of sucrose, which has a molar mass of 342, must be dissolved.

Explanation:

The question is about finding the mass of sucrose needed to prepare a semi molar solution, assuming semi molar refers to 0.5 M (molar concentration). Since the molecular mass of sucrose is given as 342, to prepare 600 cm³ (which is equivalent to 0.6 L) of a 0.5 M solution, the number of moles needed will be 0.5 moles/L × 0.6 L = 0.3 moles of sucrose. To find the mass of sucrose, we will multiply the number of moles by the molar mass:

Mass of sucrose = Number of moles × Molar mass
= 0.3 moles × 342 g/mole
= 102.6 g

Therefore, to prepare the desired semi molar solution, 102.6 grams of sucrose should be dissolved in 600 cm³ of solution.

Final answer:

The hydrosphere is the Earth's water system that interacts with the sun to influence weather patterns through the water cycle, including evaporation and condensation.

Explanation:

When the sun impacts weather, an interaction with the hydrosphere takes place. It is essential to understand that the hydrosphere, which includes all the Earth's water, is not an isolated system but interacts dynamically with other global systems such as the atmosphere, lithosphere, and biosphere. These interactions are part of what is known as the water cycle.

The sun is the primary energy source driving the water cycle by heating water in the hydrosphere, causing it to evaporate. When water vapor cools, it condenses, forming clouds and eventually falling back to Earth as precipitation, such as rain or snow. This continuous movement of water through the hydrosphere and the energy changes accompanying it significantly influence weather patterns on Earth.

Understanding these physical processes is key to studying the intricate and interdependent nature of Earth's systems, which collectively impact our global climate and environment. The hydrosphere, being a critical component of Earth's systems, plays a central role in weather and climate regulation due to its interaction with the sun's energy.

Answer:it’s d the answer is d

Explanation:

Answer:

Explanation:

I have never used this representation before, but I think first of all the figure has 7 Carbons at each joint and 1 carbon at each end. If you count from the left side, the methyl is attached to the second joint, which makes it 2-methylheptane.

D is correct, or at least I agree with you.

Answer:

I don't have the number of cubes in each bag, but whichever bag had the most cubes would have the most kinetic energy as it falls

Answer:

As the options for the question not given, lets try to answer this question generally.

Explanation:

A reliable source can be described as an authentic source which proves or declines an action, research etc.

The most reliable source for scientific information is scientific papers. This is because scientific papers are subjected to peer- review and hence been tested and validated. A peer-review can be described as a judgement or test made by a person on other peoples research, both of the people having equal caliber.

Answer:

It cites valid data because a reliable scientific source needs data to back up what they’re proving.

Explanation:

Answer:

D.

Explanation:

I took this test as a freshman and this was the only question of 4 that I can remember

The example that best shows conservation of resources is recycling aluminum cans and glass bottles.

Conservation refers to the wise and judicious use of resources to make them available for future use.

Conservation of resources can include any way by which resources are not wasted or are utilized effectively.

One way in which conservation is achieved is recycling of use products. Therefore, the example that best shows conservation of resources is recycling aluminum cans and glass bottles.

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Answer:

Honestly, while Hydrogen appears to be in group 1, it really isn't. It is unique, and has no characteristics similar to others, especially to the alkali metals in group 1 and halogens in group 17.  

Hydrogen only shares one thing with alkali metals. It has one electron in the outermost shell, and has a valency of one. As far as halogens go, Hydrogen is a reducing agent, and halogens are known for being oxidizing agents.

So, I can say that more research needs to be done on Hydrogen. In the meantime, it is quite unique. Thanks!