a car travels 66 kilometers in 3 hours. what is its speed

Answer:

It's an isotope of carbon

Explanation:

Isotopes have the same number of protons and electrons but a different number of neutrons.

Carbon, like we find it on the periodic table, has 6 electrons and protons and also 6 neutrons. ( Carbon has a standard molecular weight of 12: 6electrons + 6 neutrons)

This isotope has 6 electrons but 8 neutrons, so this represents Carbon-14. Which is an isotope of carbon.

The atom with 6 protons or electrons is Carbon. However, the mention of 8 neutrons indicates this is an isotope of Carbon, specifically Carbon-14.

A neutral atom with 6 electrons would also contain 6 protons, as the number of protons and electrons in a neutral atom are equal. The element with 6 protons is Carbon, but the presence of 8 neutrons, not 6 (that is associated with Carbon-12), indicates this is an isotope of Carbon, specifically Carbon-14. It's important to note that isotopes are variations of an element that have different numbers of neutrons.

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Answer:

0.705 g/cm³

Explanation:

Step 1: define density

The (volumetric mass) density of a sample or substance, is this sample or substance its mass per unit volume and can be defined through following formula:

ρ = m/v

with ρ = density (kg/m³)

m = mass of the substance (kg )

v = volume (m3)

Step 2: change datat SI-units

10.0 cm³ = 10^-5 m³

7.05 g = 0.00705 kg

ρ = 0.00705 kg / 10^-5 m³  = 705 kg / m³

To convert this to g/cm³ we have to divide by 1000

ρ = 0.705 g/cm³

To control this we calculate 7.05g / 10cm³ = 0.705 g/cm³

The desnity of the alcohol is 0.705 g/cm³

Answer:

9.6 %

Explanation:

Step 1: How to define  percent error ?

⇒ % error is the difference between a measured value and the known or accepted value

⇒Percent error is calculated using the following formula:

⇒%error  =  | Experimental value-theoretical value/theoretical value |  x100%

⇔ this can be written as well as : error = (| Experimental value/ theoretical value | - | Theoretical value / Theoretical value | ) x100%

Step 2: Calculate % error

In this case, this means :

%error = ( |(4.45 cm - 4.06cm ) / 4.06cm | ) x100%

%error = 0.096 x100%

%error =9.6 %

Answer:

that object will float on the water

Explanation:

Since the density of water is greater than that of the object , the object will float on the water.

NB. Density of the object=

[tex] \frac{mass}{volume} [/tex]

Given that mass of the object is 80g and volume 100cm^3

substituting them in the formula

Density=80g/100cm^3

Density=0.8g/cm^3

since 0.8<1 which is the density of the object and water respectively, the object will float.

Answer:

The force you need to apply would be 15 N.

Explanation:

To find the Force you need to apply, you have to use Newton´s second law     (F = m x a).

F = m x a ⇒ F = 5 kg x 3 m/s²⇒ F = 15 N.

The force would be 15 N.

Answer: The force needed is 15N

Explanation:

using the equation F=ma

Where F is the force in Newton

m is the mass in kg

a is the acceleration in m/s^2

F=5*3=15N

Answer:

He conducted an experiment using gold foil and alpha particles.

Explanation:

Ernest Rutherford in 1911 performed the gold foil experiment which provided a better outlook to the structure of the atom. In his experiment, he bombarded a thin gold foil with alpha particles. Most of the alpha particles passed through the gold foil and just a few was deflected back.

This observation led Rutherford to propose the nuclear model of the atom in which an atom has a small positively charged centre and electrons moving round it.

Answer:

He conducted an experiment using gold foil and alpha particles.

Explanation:

In his experiment he use the alpha particles (which are positive) emitted by a radioactive element.  If Thomson's plum pudding model was correct, the beam would go straight through the gold foil. But the alpha particles were deflected in all directions, some right back at the source. This suggest that the atom's positive charge was concentrated in a much tinier volume than Thomson imagined

Answer:

Explanation:

The main advantage of producing more than one prototype at a time is that it gives them the edge in testing different variants of cookies at the same time.

It more like introducing different commodities to see which one would best suit the consumer's needs.

The produce would be able to compare price, quality, value and parameters that can be assumed from the consumption of the cookies side by side. These set of data can then be correlated to see which prototype will give the cutting edge.

Making multiple prototypes at a time saves time, allows for comparison, and saves costs in the long run.

When developing a new product, such as a chocolate chip cookie, making more than one prototype at a time can have several advantages:

Overall, making multiple prototypes simultaneously increases efficiency, allows for better comparison, and helps save costs in the long run.

Answer:

Metamorphic rock is made by a mixture of heat and pressure

Explanation:

Answer:In the 1st structure, it would have 7 valance electrons, and the 2nd would only have 6.(as shown is the photo)

Fractional distillation is used in the production of alcoholic spirits like brandy or whiskey, where mixtures of water and alcohol are separated into multiple distilled alcoholic products based on their boiling points.

Aside from the refining of crude petroleum into various fuels and oils, another mixture of liquids separated on an industrial scale by fractional distillation is the production of alcoholic spirits, such as brandy or whiskey. In this process, a mixture of water and alcohol is heated, causing the components with lower boiling points (like ethanol) to vaporize first. These vapors rise up the distillation column, condensing at different heights according to their boiling points, and are then collected as separate products. This detailed understanding of fractional distillation illustrates how different substances, due to variations in boiling points, can be extracted from a complex mixture.

Answer:

Density is  7.15 g /mL.

Mass is  445.2 g.

Explanation:

Density:

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

D=m/v

D= density

m=mass

V=volume

Symbol:

The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.

Given data:

Mass of first zinc sample = 210.10 g

Mass of second zinc sample = 235.10 g

Combined volume = 62.3 mL

Density of combined sample ?

Mass of combined sample = ?

Solution:

Mass of combined sample = 210.10 g + 235.10 g = 445.2 g

density = mass / volume

density = 445.2 g / 62.3 mL

density = 7.15 g /mL

Answer:

Explanation:

Dissolving is when a soluble solute is added to a solvent. The solvent surrounds the solutes and makes a solution of it. The process of dissolving is known as dissolution. For a substance to be able to dissolve in a solvent, they must both have similar properties. It is generally known that like dissolves like. Polar solvents will dissolve polar solutes and vice versa.

Boiling can reverse dissolution process in that, the solvent can reach its boiling point and it wil begin to give out vapours. As more vapours are release, the solutes begin to aggregate and form back.

Answer:

Rigid plates that move around Earth's surface is called tectonic plates.

Explanation:

Lithosphere is rigid and relatively cold and is the outer surface of the planet. The convective motions of maintenance break the lithosphere into plates.

This place that a form can move in any direction, can move towards each other, can move away and push each other which is the reason for formation of mountains for shifting of continents for making of ocean basin.  

Answer:

The percentage by mass of element X is 25 %.

The percentage by mass of element Y is 75 %

Explanation:

X + Y ⇒ XY

3.5 g of element X + 10.5 g of element Y = 14g in total

⇒Element X : 3.5g / 14g = 0.25 ⇒ x 100 % = 25 %

⇒Element Y : 10.5 / 14 = 0.75 ⇒ x 100 % = 75 %

The percentage by mass of element X is 25 %.

The percentage by mass of element Y is 75 %

The percent by mass of X in the compound is 25%, and the percent by mass of Y in the compound is 75%.

The total mass of the compound formed by elements X and Y is the sum of the masses of X and Y, which is 3.5 g + 10.5 g = 14 g. The percent by mass of an element in a compound is calculated by taking the mass of the element and dividing it by the total mass of the compound, then multiplying by 100% to convert the decimal to a percent.

So, the percent by mass of X is (3.5 g / 14 g) × 100% = 25%. The percent by mass of Y is (10.5 g / 14 g) × 100% = 75%.

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Answer:

22.27 °C = ΔT

Explanation:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m × c × ΔT

Given data:

mass = 28 g

heat absorbed = 58 cal

specific heat of copper =  0.093 cal/g .°C

temperature change =ΔT= ?

Solution:

Q = m × c × ΔT

58 cal = 28 g × 0.093 cal /g.°C × ΔT

58 cal = 2.604 cal.°C × ΔT

58 cal / 2.604 cal .°C = ΔT

22.27 °C = ΔT

Answer:

Answer is: zinc nitrate (Zn(NO₃)₂) is strong electrolyte.

Explanation:

Ions are good conductors of electric current in the solution. Strong electrolytes are strong acids (for example hydrochloric acid HCl), strong bases (sodium hydroxide NaOH, for example) and soluble ionic salts (in this example, zinc nitrate).

Answer:

On the periodic table, there are two numbers for every element: the atomic number and the atomic weight.

The numbers at the top of the square represents the number of protons present in the atom's nucleus of that element. This is called the atomic number.

For example, the atomic number for the element Krypton is 36. That means that there are 36 protons in the nucleus. If there were not 36 protons in the nucleus of that atom, that would create the atom of a completely different element. For example, if one proton was to be removed from the nucleus of the atom for the element of Krypton that atom will be an atom of the element bromine.

Explanation:

The bottom number found on each element in the periodic table is the atomic mass. This represents the total count of protons and neutrons found in that element's atom. The atomic mass is typically an average value due to the variety of isotopes existing for each element.

The bottom number on each element shown on the periodic table is called the atomic mass. Each element in the periodic table is represented with the atomic number, element symbol, and atomic mass. The atomic number (Z) is displayed above the element symbol, while the atomic mass (A), which is the sum of the number of protons and neutrons in an atom, is displayed below it. For instance, if we look at carbon, we will see its atomic number is six, and its atomic mass is approximately 12.01. This atomic mass is the average mass of all the isotopes of an element, taking into account the relative abundance of each isotope.

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Answer:

kg, mg. 65.00, 65,000,000. 65.01, 65,010,000. 65.02, 65,020,000. 65.03, 65,030,000. 65.04, 65,040,000. 65.05, 65,050,000. 65.06, 65,060,000.

Explanation:

Answer:

Explanation:

Before answering the questions, it is important to define these given terms:

a) There are 2 countries in North America: Belief

The idea that there are just two countries in North America is wrong. A person might choose to hold on to this false knowledge despite strong evidence that can annul this system of reasoning. He or she might be coming from the point view that in terms of economic prowess, there are just two countries in North America. This is more of a belief.

b) If I jump out a window I will die: belief.

This is more of a belief, there is nothing to prove that if one jumps out of a window, death is inevitable.

c) Through the process of natural selection humans, chimpanzees and

gorillas evolved from a common ancestor species.: Theory

This is a theory that seeks to provide a scientific basis to evolution. To come to this conclusion, observations have been made on humans, chimpanzees and gorillas.

d) Energy can be converted into matter in ratio of E=mc² : Law

This is a scientific law which has been simplified in form of mathematical expression to show the relationship between mass energy.

e) Canada is the greatest country on earth: Belief

This is a mere belief. Almost every Canadian can attest to this assertion. It is a thing of national pride and loyal for one to belief their country is the greatest.

f) Illness comes from microscopic germs, some of which, bacteria can be

seen under the microscope and cultivated outside a host, and others,

viruses, are too small to see under the microscope: Fact

It is a proven fact that germs causes diseases.

Answer:

a) Belief; b) Belief, c) Theory; d) Law; e) Belief; f) Hypothesis

Explanation:

1) The steps involved in scientific method are: a) a researcher make an observation of a process or system; b) he/she make an hypothesis, it means a statement that describes something about the process/system observed; c) Hyphothesis is tested trough experimentation d) During and after experimentation, the researcher makes observations; e) Conclusions are made from the analysis of results; f) A theory that explains the process is made, based on observations and tested trough experimentation. A theory is postulated as a possible explanation, that can change and be replaced in the future.

3) A Law is a statement or equation that exactly describes the relation between different variables and that is universally valid.

2) In constrast, a belief is something that people think but is not supported by knowledge.

Based on this information:

a) is a belief, because someone can think that there are only two countries in North América, but actually there are more than that.

b) is a belief, because we don´t know what will happen.

c) Is a theory, something that was tested trough experimentation and that is already accepted as possible.

d) This is a law, that relates energy with mass.

e) Is a belief too, because someone can think that but there are bigger countries.

f) This could be an hypothesis that needs to be tested trough experimentation.

Answer:

For 1: The correct answer is Option B.

For 2: The correct answer is Option D.

Explanation:

Average atomic mass is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

The equation used to calculate average atomic mass follows:

[tex]\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i[/tex]

We are given:

For every 100 atoms of X, 30 of them have a mass of 125.0 u and 70 of them have a mass of 126.0 u. This means that fractional abundance of X-125 isotope is 0.3 and that of X-126 isotope is 0.7

Mass of the isotope = 125

Fractional abundance of isotope = 0.3

Mass of the isotope = 126

Fractional abundance of isotope = 0.7

Putting values in above equation, we get:

[tex]\text{Average atomic mass }=[(125\times 0.3)+(126\times 0.7)]=125.7u[/tex]

Hence, the correct answer is Option B.

We are given:

Average atomic mass of sulfur = 32.06 u

Sulfur has 4 naturally occurring isotopes: S-32, S-33, S-34 and S-36

As, the average atomic mass of sulfur lies closer to the mass of S-32 isotope. This means that the relative abundance of this isotope is the highest of all the other isotopes.

The 'S-32' isotope is the most common isotope of the given element.

Hence, the correct answer is Option D.

1. The average atomic mass of element X is 125.7 u

The correct answer to the question is Option B. 125.7 u

2. The most reasonable inference you could make about sulfur (S), which has four stable isotopes and an average atomic mass of 32.06 u is that the most common isotope of sulfur is S-32.

The correct answer to the question is

Option D. The most common isotope of sulfur is S-32.

1. Determination of the average atomic mass of X

Let A represent isotope X-125

Let B represent isotope X-126

For A (isotope X-125)

Mass of A = 125 u

Abundance of A (A%) = 30%

For B (isotope X-126)

Mass of B = 126 u

Abundance of B (B%) = 70%

Average atomic mass of X =?

Average atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100]

=  [(125 × 30)/100] + [(126 × 70)/100]

= 37.5 + 88.2

Thus, the average atomic mass of X is 125.7 u.

The correct answer to the question is Option B. 125.7 u

2. The average atomic mass of an element is closest to the mass of the most abundant isotope of the element.

Thus, we can conclude that the most common isotope of Sulfur is S-32 since it's average atomic mass is 32.06 u

NOTE: Stable isotopes of sulphur are: S-32, S-33, S-34 and S-36

The correct answer to the question is Option D. The most common isotope of sulfur is S-32.

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Magnesium (Mg) has 10 core electrons. Core electrons are the electrons in an atom that occupy the inner energy levels, closer to the nucleus. In the case of magnesium, the electron configuration is 1s² 2s² 2p⁶ 3s².

In an atom, electrons occupy different energy levels or orbitals. The innermost energy level, known as the 1s orbital, can hold up to 2 electrons. The next energy level, 2s, can also hold up to 2 electrons, followed by the 2p orbital, which can hold up to 6 electrons. The electrons in the innermost energy levels, specifically the 1s and 2s orbitals, are considered core electrons.

In the case of magnesium (Mg), its electron configuration is 1s² 2s² 2p⁶ 3s². This means that there are two electrons in the 1s orbital, two electrons in the 2s orbital, six electrons in the 2p orbitals, and two electrons in the 3s orbital. The core electrons in magnesium are those in the filled 1s and 2s orbitals, which add up to a total of 10.

Hence, magnesium has 10 core electrons.

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Answer:

is the revolving service structure of the launch pad at the Kennedy Space Center in Florida, clocking in at 4.86 million pounds.

Explanation: i hope it helps and can you put my as a Brainliest thx :)

Answer:

The inner core

Explanation:

Well, Jaron's tunneling machine would find it quite impossible to even penetrate the crust.

Our dynamic earth is arranged in concentric layers with each shell at varrying physical state and chemical properties.

As we go down the earth, the temperature and pressure increases significantly. The innermost layer of the erth is the inner core and it is expected that the temperature and pressure here should be the greatest. The pressure in the inner core is so great that the materials that were supposed to be in molten form exists as solid in there.

Answer:The inner core

Explanation:

The most important step in the scientific method is observation. Observations allow scientists to gather data and information about the natural world, which is essential for forming hypotheses, conducting experiments, and drawing conclusions.

The most important step in the scientific method is observation. This is because observations allow scientists to gather data and information about the natural world. Without accurate observations, it would be difficult to form hypotheses, conduct experiments, and draw conclusions.

Observations can be made using our senses, such as seeing, hearing, touching, tasting, and smelling. Scientists carefully observe and record their findings in order to better understand a phenomenon or solve a problem. For example, if a scientist is studying the growth of plants, they would observe and record the height, color, and number of leaves of different plants over a period of time.

Observations help scientists identify patterns and trends, which can then be used to formulate hypotheses and design experiments. They provide the foundation for the entire scientific method and help scientists make informed decisions based on evidence.

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Answer:

22.96 $ per 1 g of gold

Explanation:

We know that 1 g is equal to 0.035 oz.

Now we formulate the following reasoning:

if         1 oz of gold have a value of 655 $

then    0.035 oz of gold have a value of X $

X = (0.035 × 655) / 1 = 22.96 $

Answer:

$22.92

Explanation:

To solve this problem, you should convert the units to have the same in each quantity.

First we are going to convert from grams (g) to ounces (oz):

[tex]1.00g*\frac{1oz}{28.34g}=0.035oz[/tex]

It means that there are 0.035 ounces in 1 gram.

Then you should multiply that value by the price of gold that is given in ounces (oz):

[tex]0.035ozGold*\frac{655.00}{1ozGold}=22.92[/tex]

That is the price of 1.00 gram of gold is $22.92

Answer:

The average atomic mass of Y is 123.4725 g/mol

Explanation:

The average mass of an element is calculated by taking the average of the atomic masses of its stable isotopes.

The enitre atomic mass = 100 % or 1

⇒ this consists of 57.25 % atoms with mass 123.90 g/mol

57.25 % = 0.5725

⇒ this consists of 42.75 % atoms with mass 123.90 g/mol

42.75 % = 0.4275

To calculate the mass of this isotope we use the following:

0.5725 * 123.90 + 0.4275 * 122.90 = 123.4725 g/mol

Answer:

The atomic weight of hypothetical element will be 63.568 amu.

Explanation:

Given data:

First isotope mass = 62.2 amu

Percentage abundance of first isotope = 24%

Mass of second isotope = 64 amu

Percentage abundance of second isotope = 100- 24 = 76%

Solution:

The atomic weight of hypothetical element will be the average atomic mass of its isotopes.

Average atomic mass = [mass of isotope× its abundance] + [mass of isotope× its abundance] +...[ ] / 100

Now we will put the values in formula.

Average atomic mass = [24 ×62.2] + [76× 64] / 100

Average atomic mass = 1492.8 + 4864 / 100

Average atomic mass = 6356.8/100

Average atomic mass =  63.568 amu

The atomic weight of the hypothetical element with isotopes of masses 62.2 u (24% abundance) and 64.0 u is approximately 63.568 u.

The atomic weight of a hypothetical element with two isotopes mass can be calculated by taking the weighted average of their masses and abundances. In this case, we have isotope A with a mass of 62.2 u and an abundance of 24% (0.24), and isotope B with a mass of 64.0 u. To find the atomic weight, we use the following formula:

Atomic Weight = (Isotope A's mass × Isotope A's abundance) + (Isotope B's mass × Isotope B's abundance)

By plugging the values we get:

Atomic Weight = (62.2 u × 0.24) + (64.0 u × (1 - 0.24))

Atomic Weight = (14.928 u) + (64.0 u × 0.76)

Atomic Weight = 14.928 u + 48.64 u

Atomic Weight = 63.568 u

So, the atomic weight of the hypothetical element is approximately 63.568 u.

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Answer:

C. This is because weathering is when a rock is broken down to smaller bits and destroyed. Hope this helps!

Answer:

the answer is C.) Breakdown of rocks through mechanical or chemical processes.

Explanation:

Answer:

Out of all the six options that we are given option one option four and option five would be correct regarding electronic tools.

Explanation:

Since electronic tools are made with the purpose of calculation that can be made easier and faster. Hence the option that suggest that electronic tools give the answers quickly and clearly should be correct.

Secondary the option that says electronic tools can have a large amount of data is also true. Because large amount of calculations can be carried out using electronic tools easily. And since the data is clear the  data analysis will also be accurate.

Answer:

just summing up what the other person said;

A D and E :)

Explanation: