Perform the following mathematical operation and express the results to the correct number of significant figures. (0.102 x 0.0821 x 273)/1.01

Answer:

Explanation:

What is the kinetic energy of the ball as it is half way through the fall?

Answer: option c. protons and neutrons

Explanation:

Answer: Protons and Neutrons

Explanation: The nucleus is a dense structure in an atom. It consists of positively charged protons and neutrally charged neutron. This makes the nucleus a positively charged region in an atom.

Answer:

3.011×0²³  atoms of Ar

Explanation:

To find no.of atoms of Ar gas in 10.2 L at STP.

At STP 1 mole of a gas occupies 22.4  L  and contains 6.022×10²³ atoms/molecules or ions.

At STP

22.4 L contains 1 mole Ar t

10.2 L contains (10.2÷22.4)×1 Ar

[tex]\frac{1}{2}[/tex] mole Ar contains [tex]\frac{1}{2}[/tex]×6.022×10²³

=3.011×0²³  atoms of Ar

Final answer:

To calculate the number of atoms in 10.2 L of Ar gas at STP, we convert the volume of gas to moles and use Avogadro's number. The number of atoms in 10.2 L of Ar gas at STP is approximately 2.742 x [tex]10^{23}[/tex] atoms.

Explanation:

To determine the number of atoms in 10.2 L of Ar gas at STP, we need to convert the volume of gas to moles and then calculate the number of atoms using Avogadro's number.

First, we convert 10.2 L to moles using the molar volume of a gas at STP, which is 22.4 L/mol.

So, 10.2 L of Ar gas is equal to 10.2 L / 22.4 L/mol = 0.455 moles of Ar gas.

Next, we use Avogadro's number, which is 6.022 x 10^23 atoms/mol, to calculate the number of atoms in 0.455 moles of Ar gas.

So, the number of atoms in 10.2 L of Ar gas at STP is 0.455 moles x 6.022 x [tex]10^{23}[/tex] atoms/mol = 2.742 x [tex]10^{23}[/tex] atoms.

Answer:

                    Option- C (135 grams) is the correct answer.

Explanation:

                     In this experiment the students took tablet of an antacid which when added to water decomposes and produces many products among which some are in gas form.  Now, as stated the ziplock bag is quickly sealed after the addition of tablet so it means nine of the gas produced is allowed to escape from the bag.

                     Therefore, according to law of conservation of mass the mass can neither be created nor destroyed. So, in this experiment there will be no increase in mass because the mass cannot be created and also, there will be no decrease in mass because it can neither be destroyed. So, we will assume that the gas produced is not allowed to escape hence, the total mass of the system (i.e. bag, water, products) will remain the same as they were before the reaction.

Answer:

135 grams

Explanation:

Your answer would be Transpiration

Answer:

convection

Explanation:

heat will always rise

Answer:

Convection

Explanation:

Answer:

B

Explanation:

it depends if the weather was cold but ummm they warm and cold air would mix and turn story and watch out tornadoes could also happen

Answer:

Stormy

Explanation:

Apex

Answer:

The line of best fit

Explanation:

The line of best fit is the average, aka a trend

In a line graph, the line itself, connecting data points, shows trends. Scientists analyze its slope and direction to understand patterns and variations in the data.

In a line graph, the trends are primarily represented by the line itself. A line graph is a type of chart that displays data points connected by a continuous line. Each data point typically represents a pair of values, one on the horizontal axis (usually the independent variable) and one on the vertical axis (usually the dependent variable).

The line in a line graph shows how the dependent variable changes as the independent variable varies. By examining the direction, slope, and shape of the line, scientists and researchers can identify and communicate various trends in the data. Here's how:

1. Direction of the Line: The direction of the line indicates whether the dependent variable is increasing or decreasing as the independent variable changes. A rising line suggests an increase in the dependent variable, while a falling line suggests a decrease.

2. Slope of the Line: The slope of the line represents the rate of change of the dependent variable concerning the independent variable. A steeper slope indicates a more rapid change, while a shallower slope suggests a slower change.

3. Curvature of the Line: Sometimes, the line may curve, indicating a nonlinear relationship between the variables. The curvature might imply acceleration, deceleration, or other complex patterns.

In addition to the line itself, trendlines or best-fit lines can be added to a graph to provide a smoother representation of the overall trend in the data. These trendlines help researchers make predictions and identify general patterns within the data.

Overall, a line graph is a powerful tool for visualizing and conveying data trends, making it a valuable tool in scientific research, data analysis, and communication. Researchers can quickly grasp the direction and magnitude of changes in the dependent variable as it relates to variations in the independent variable.

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Answer: No

Explanation:Combustion is the process where a hydrocarbon reacts with oxygen gas to produce carbon dioxide and water.

Combustion reaction:

CH + O2 => CO2 + H2O

Answer: 2050°C

Explanation:

K = 2323K

°C = K — 273 = 2323 — 273

°C = 2050°C

The melting point of single-crystal sapphire when converted from Kelvin to degrees Celsius is approximately 2049.85°C, indicating the strength of the bonds within its crystal structure, akin to diamond and silicon carbide.

To convert the melting point of single-crystal sapphire from Kelvin to degrees Celsius, you subtract 273.15 from the Kelvin temperature. Given that the melting point of sapphire is around 2323K, the calculation would be:

2323K - 273.15 = 2049.85°C

Therefore, the melting point of single-crystal sapphire in degrees Celsius is approximately 2049.85°C. This high melting temperature indicates the strength of the bonds within the crystal structure of sapphire, similar to other compounds with diamond or related structures, such as diamond and silicon carbide, which also have high melting points due to their strong covalent bonds.

Answer:

A. Biodiversity can increase the rate of extinction

Explanation:

That statement is false because variety is better for a better ecosystem. With variety more can survive in certain situations that others cant.

Biodiversity can increase the rate of extinction is not a way that biodiversity is important to an ecosystem. Therefore, option A is correct.

The variety and variability of life on Earth is referred to as biodiversity or biological diversity. A measure of variation at the genetic, species, and ecosystem levels is called biodiversity.

Genetic, species, and ecosystem diversity are the typical three levels of biodiversity that are covered. The various genes that each unique plant, animal, fungus, and bacteria have constituted genetic variety. Both inside and between species, it happens.

Conservation of biodiversity safeguards the genetic, microbial, animal, and plant resources needed for agriculture, food production, and ecosystem services like soil nutrient cycling, pest and disease control, preventing erosive processes, and pollination plants and trees.

Thus, option A is correct.

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Redox reactions are the reactions that have been constituting reduction and oxidation. In the chemical equation, chlorine is reduced and bromine is oxidized. Thus, option B is correct.

A redox reaction is a combination of reduction and oxidation reactions. When a reactant loses an electron, then it is called oxidation, whereas the reactant that gains an electron is said to be where the reduction takes place.

The redox reaction is written as,

2 NaBr (aq) + Cl₂ (g) → 2 NaCl (aq) + Br₂ (aq)

Here, oxidation,

2 Br⁻¹ - 2 e⁻ → 2 Br⁰

Reduction,

2 Cl⁰ + 2 e⁻ → 2 Cl⁻¹

From the reaction, NaBr is a reducing agent as it has donated its electron, whereas chlorine gas is an oxidizing agent as it has an accepted electron.

Therefore, in the chemical reaction chlorine is reduced and bromine is oxidized.

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Answer:

C

Explanation:

One electron is needed to completely fill the outer shell of this atom.

The number of electrons, protons, and neutrons in the atom are:

Number of electrons = 9

Number of protons = 9

Number of neutrons = 11

The number of additional electron needed is 1

The correct answer to the question is Option C. 9 electrons, 9 protons, 11 neutrons; 1 additional electron is needed to completely fill the outer shell of this atom

Fluorine is a member of the group 17 element called Halogens. They have 7 valence electrons.

NOTE: The nucleus contains the neutrons and the protons while the electrons revolve around the nucleus.

From the diagram given above, the following data were obtained:

Number of electrons = 9

Number of protons = 9

Number of neutrons = 11

Valence electron = 7

Now, we can see that the fluorine atom has 7 valence electrons. Thus, fluorine atom will require 1 electron to complete its outermost shell.

Thus, the correct answer to the question is Option C. 9 electrons, 9 protons, 11 neutrons; 1 additional electron is needed to completely fill the outer shell of this atom

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Answer:

Heat from the engine under the hood transfered to the snow, melting it.

Explanation:

((Study Island))

Answer:

its a

Explanation:

Answer:

0.000001

Explanation:

Answer:

Atomic mass = 27 amu

Explanation:

Given data:

Atomic mass of element X= ?

Abundance of X-28 = 75%

Abundance of X-24 = 100 - 75 = 25%

Atomic mass of X-28 = 28 amu

Atomic mass of X-24 = 24 amu

Solution:

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass = (75×28)+(25×24) /100

Average atomic mass =  2100 + 600 / 100

Average atomic mass = 2700 / 100

Average atomic mass = 27 amu.

Answer:BaCl2 + Al2(SO4)3 -->BaSO4 + AlCl3.

Explanation:

Answer:

5000

Explanation:

you do stuff and more stuff

Answer:

C)wavelength

Explanation:

if the wavelength of a light wave is shorter, that means that the frequency will be higher because one cycle can pass in a shorter amount of time. ... That means that longer wavelengths have a lower frequency. Conclusion: a longer wavelength means a lower frequency, and a shorter wavelength means a higher frequency!

Answer:

123 Celsius is equal to 396.15 Kelvin scale

Explanation:

Answer:

Be (899 kj/mol) , Se (940.9 kj/mol), Ne(2081 kj/mol), He (2370 kj/mol),

Explanation:

For noble gases as they have complete octet so they require high amount of energy to remove the electron.

Trend along period:

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.

Trend along group:

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.

Answer: False

Explanation: Organs are made up of different tissues

The statement is false. Tissues are made up of similar cells that share a common function. Organs are made from different types of tissues that work together.

The statement in the question is false. In biology, tissues are groups of similar cells that have a common structure and function. However, they do not form organs independently. Actually, the hierarchy in biological organization is cells - tissue - organ - organ system.Organs are made up of different types of tissues that work together to perform a specific function or set of functions. For example, the heart is an organ made up of cardiac tissue which allows it to contract and pump blood around the body.

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Answer:

330,000

Explanation:

Since there are only 2 significant figures in 0.024 ( and 0.024 is the number with the least number of significant numbers), the answer is 330,000, not 331,000.

Answer:

True

Explanation:

Global warming is a theory accepted by a majority of scientists. This statement is True and correct option is option 1.

Global warming is the phenomenon of a gradual increase in the temperature near the earth’s surface.

This phenomenon has been observed over the past one or two centuries. This change has disturbed the climatic pattern of the earth.

It is the long-term heating of Earth’s surface observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth’s atmosphere.

Therefore, Global warming is a theory accepted by a majority of scientists. This statement is True and correct option is option 1.

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Answer:

11,000 milligrams

Answer:

The statement that best describes the trend in first ionization enery of elements on the periodic table is:

It generally decreases down a group because valence electrons are farther from the nucleus.

The first ionization energy measures how difficult is to release an electron from the outermost shell. The higher the ionization energy the more difficult it is to release an electron, the lower the ionication energy the easier to release an electron.

As the atomic number of the atom increases (which is what happens  when you go down a group) the furthest the outermost shell of electrons will be (the size of the atoms increases) and so those electrons require less energy to be released, which means that the ionization energy decreases.

Hope it helps!

Answer:

1. Across a period , the ionization energy increases  because the formation of a cation becomes more difficult owing to the increase in nuclear charge.

2. Ionization energy decreases down the group because the outer electrons become progressively separated from the nucleus and so are less tightly held .

Explanation:

Answer: 2C2H + 5O2 => 4CO2 + 2HO

Explanation: The chemical equation is now balanced.

Answer:

The answer is "power dispatcher."

Explanation:

"Power dispatchers" are also known as "power distributors." Their field of work is related to controlling the distribution of electricity to the "electrical substations." These substations allow the transmission of electricity to step down from a higher voltage to a lower voltage.

Whenever there is an electrical problem, the power dispatcher also comes into play. They make sure that the power lines are intact and checks for possible damages when typhoons or earthquakes occur.

Thus, this explains the answer.

Answer:

C

Explanation:

Answer:it is necessary to use colourless

Explanation: A pure substance generally has a melting range (the difference between the temperature where the sample starts to melt and the temperature where melting is complete) of one or two degrees. Impurities tend to depress and broaden the melting range so the purified sample should have a higher and smaller melting range than the original, impure sample

Clear colourless oil is necessary in determining the melting point of naphthalene, as it allows for uniform heat distribution, accurate temperature readings, and better viewing of the changes in the sample's state.

Clear colourless oil is used in the determination of the melting point of naphthalene to ensure accurate readings. The oil serves as a medium to uniformly distribute heat around the naphthalene sample. If the oil were coloured or not transparent, it would absorb some of the heat, thereby affecting the temperature distribution and potentially the accuracy of the melting point. In addition, the clear oil helps let visible light pass through, allowing for better viewing of the naphthalene as it changes from solid to liquid. Therefore, achieving accurate results in this experiment heavily relies on the use of clear colourless oil.

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Answer:

The heat required is 4.18 J

Explanation:

First you need to know what is specific heat capacity ,

Specific Heat Capacity : The amount of heat required to raise the temperature of 1 gram of substance by one degree  .

The specific heat capacity of water is 4.18 J/gC.

This means that to increase the temperature of 1 gram of water by one degree , 4.18 J of energy is needed.

The formula to calculate the heat is given by :

[tex]q=mc\Delta T[/tex]

q = heat absorbed/emitted

m = mass of the substance

[tex]\Delta T[/tex] = Change in temperature

c = 4.18 J/gC

Here , m= 1 gram

[tex]\Delta T[/tex]= 6 -5 = 1 degree

Put the value in the formula:

[tex]q=mc\Delta T[/tex]

[tex]q=1\times 4.18\times 1[/tex]

q = 4.18 J

Unit conversion :

m = gram

c = J/gram C

T  = C

q = mcT = gram x  J/gram C x C

q = J