3. Scientific methods may include three steps of study as listed below. Explain each step in detail with a complete content related sentence. (ref: p.12-16) a. Hypothesis b. Theory c. Scientific law

Answer:

2 because it has two outer shell electrons out of 8 (relevant rule only for the first 20 elements)

Answer:

So when a cat puts up its middle finger its usually trying to scare you off.

Explanation:

it's gonna kill you.

Answer:

name four agricultural inputs are subsidized by the government

0.297 kJ of heat is needed to raise the temperature of 10g of aluminum from 22 degrees Celsius to 55 degrees Celsius.

The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.

It is a measure of how much energy it takes to raise the temperature of a substance. It is the amount of heat necessary to raise one mass unit of that substance by one temperature unit.

It is given by the formula -

                                                  Q = mcΔT

where, Q = amount of heat

m = mass

c = specific heat

ΔT = Change in temperature

Given,

mass = 10g

c = 0.901J/g⁰C

Initial temperature (T₁) = 22⁰C

Final Temperature (T₂) = 55⁰C

Q = mcΔT

= 10 × 0.901 × (55 -22)

= 297.33 J = 0.297 kJ

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The electron configuration of vanadium can be obtained by adding the remaining electrons to the configuration of argon, which gives [Ar] 4s2 3d3.

What is Electric Configuration?

lectronic configuration is the arrangement of electrons in the shells and sub-shells of an atom or molecule. It is represented by a series of numbers and letters that indicate the number of electrons in each energy level and orbital. The electronic configuration of an atom determines its chemical properties and reactivity, as well as its physical properties such as its atomic radius and ionization energy. The electronic configuration is determined by the number of protons in the atom's nucleus, which determines its atomic number and thus the number of electrons that can be accommodated in each shell and sub-shell.

The correct answer is C.) [Ar] 4s2 3d3. The shorthand or noble gas electron configuration for vanadium (V) is written by indicating the electron configuration of the noble gas that comes before it in the periodic table, which is argon (Ar) in this case. The electron configuration of argon is [Ne] 3s2 3p6.

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The chemical equation similar to a mathematical equation as equal sign means both sides . The differential equation is used as a model a natural phenomenon.

The chemical equations and mathematical equation have lot of common things. The balancing of equation and algebraic equation have similarities. we use differential equation is used as a model  a natural phenomenon. chemical equation like the math's equation must be balanced. some basic concepts of math's are used in chemistry to balance equation.

Thus, The chemical equation similar to a mathematical equation as equal sign means both sides . The differential equation is used as a model a natural phenomenon.

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Answer:

The chemical equation similar to a mathematical equation as equal sign means both sides.

Explanation:

Chemical equations and mathematical equations have a lot in common. The equal sign in a math equation means that both sides, however they're written, are equivalent expressions of the same thing: 2(3) - 4 = 5(2) - 8 ← Try it for yourself. The arrow or arrows in a chemical equation mean the same thing.

The presence of fault lines in Alaska make it a region of frequent earth quakes. Alaska is in a shallow part of a subduction zone.

Subduction zones are created in the divergent plate boundaries where two tectonic pates dives back away from each other.

Alaska experiences 50–100 earthquakes each day, which amounts to 11% of all earthquakes worldwide and more than half of all earthquakes in the United States. Alaska is located in a distinct and intricate tectonic environment, where the plates moves apart.

Despite the common misconception that large earthquakes are seldom, five significant underthrusting events have occurred in Alaska since 1938. The Aleutian Islands and south-central Alaska are often where these incidents take place.

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Answer:

D

Explanation:

The answer option which best describes the relationship between air temperature and relative humidity is: C. Cold air can hold less water vapor than warm air.

Temperature can be defined as a measure of the degree of coldness or hotness of a body or physical object.

In Science, an object's temperature is measured by using a thermometer and its standard units are;

At constant humidity, a decrease in the atmospheric (air) temperature result in an increase in the relative humidity in an atmosphere.

Consequently, cold air is able to hold less water vapor in comparison with warm air.

In conclusion, the relationship between air temperature and relative humidity is that warm air can hold more water vapor than cold air while cold air can hold lesser water vapor due to relative humidity.

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Answer:

Lake pontchartrain

Explanation:

1. The constituent gases of air are:

2. The surrounding air is not seen with the eyes because it is transparent. Air molecules are not visible to the na-ked eye, and they do not scatter or absorb visible light significantly. Therefore, air appears colorless and transparent.

3. To prove that air supports burning, you can perform an experiment with a burning candle. Place a glass jar or bell jar over a lit candle, ensuring that the jar is airtight. As the candle burns, it consumes oxygen from the air inside the jar. Eventually, the candle flame will go out due to the lack of oxygen, proving that air (specifically oxygen) is necessary for burning.

4. To show that air occupies space, you can perform a simple experiment using a plastic bottle or syringe. Fill the bottle or syringe with water, ensuring there are no air bubbles. Then, cover the opening tightly and try to compress the air inside. You will find that it is not possible to compress the air significantly, indicating that air occupies space.

5. To prove that air has weight, you can use a sensitive balance or scale. Weigh an airtight container or balloon, and then fill it with air. The weight of the container or balloon with the added air will be greater than its initial weight, demonstrating that air has weight.

6. Air is useful to us in various ways. Three points highlighting the importance of air are:

7. Three properties of air include:

Air exerts force in various ways. For example, air pressure allows objects like airplanes to fly by providing lift. Air resistance or drag opposes the motion of objects moving through the air, creating a force that can affect their speed and trajectory.

8. Four effects of air pollution include:

9. Causes of pollution:

10. Two control measures for air pollution include:

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The solubility of a substance, such as sugar, depends on several factors, including temperature, pressure, and the presence of other solutes. In this case, the student adds the same amount of sugar and tea bag to the same amount of hot water every day, but the temperature of the water could vary from day to day, affecting how much sugar dissolves.

According to the graph, the least amount of sugar dissolved on day 3, while the most sugar dissolved on day 5. The difference in temperature on these days could explain this variation. On day 3, the water may have been cooler, making it more difficult for the sugar to dissolve. On the other hand, on day 5, the water may have been hotter, which could have increased the solubility of the sugar.

To increase the amount of sugar that dissolves in the tea, the student could try using hotter water or stirring the sugar more vigorously to distribute it evenly throughout the water. Alternatively, the student could try adding the sugar gradually while stirring to give it more time to dissolve before adding more.

Answer:

I'm not 100% sure on this because mine hasn't been graded yet, but here are the answers I submitted.

Explanation:

Which day the least sugar dissolved and which day the most sugar dissolved:

Day 4 is when the least sugar dissolved, and Day 2 is when the most sugar dissolved.

What could have caused less sugar to dissolve on some days:

The temperature of the tea could have caused the sugar not to dissolve on some days.

What the student could do to his drink to make more sugar dissolve.

The student would need to add the sugar to the tea as soon as it's done boiling.  The Sugar will dissolve faster in a warmer tea due to more energy of movement.  

Be sure to stir the tea as you add the sugar.  Stirring the sugar into the tea speeds up the rate of dissolving by helping distribute the sugar particles throughout the tea.  

If the student were to use granulated sugar, those are smaller particles and have greater surface area.  Greater surface area allows for more contact between the tea and the sugar.

The formulas for the binary ionic compounds are:

We want to write the formulas of different binary ionic compounds. to do so, we need to consider the octet's rule.

The octet's rule establishes that atoms will lose, gain or share electrons to achieve the electron configuration of the nearest noble gas (8 valence electrons except for He with 2).

K has 1 valence electron so it will lose 1 electron to form K⁺. I has 7 valence electrons so it will gain 1 electron to form I⁻. The neutral compound between K⁺ and I⁻ is KI.

Mg has 2 valence electrons so it will lose 2 electrons to form Mg⁺². Cl has 7 valence electrons so it will gain 1 electron to form Cl⁻. The neutral compound between Mg⁺²⁺ and Cl⁻ is MgCl₂.

Na has 1 valence electron so it will lose 1 electron to form Na⁺. S has 6 valence electrons so it will gain 2 electrons to form S⁻². The neutral compound between Na⁺ and S⁻² is Na₂S.

Al has 3 valence electrons so it will lose 3 electrons to form Al³⁺. S has 6 valence electrons so it will gain 2 electrons to form S⁻². The neutral compound between Al³⁺ and S⁻² is Al₂S₃.

Al has 3 valence electrons so it will lose 3 electrons to form Al³⁺. N has 5 valence electrons so it will gain 3 electrons to form N³⁻. The neutral compound between Al³⁺ and N³⁻ is AlN.

The formulas for the binary ionic compounds are:

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Answer:

A is the only neutral atom there.

Explanation:

It consists of 6 atoms 6 neutrons and 6 electrons which means it is neutral. I am currently in chemistry.

Number of half-lives is 3

The decay of this radioactive unknown compound is a first-order process.

We can express the time dependence of its mass m using a first-order integrated rate law, where k is the rate constant:

mt = mass at time t

m0 = initial mass

t = time

Procedure:

1) We need to find "k":

From the first-order rate law we clear k,

\(\frac{mt}{mo} = e^{-kxt}\)

㏑\((\frac{mt}{mo})= -kxt\)

\(\frac{ln(\frac{mt}{mo}) }{-t} = k\)

\(k=\frac{ln(\frac{65.59ng}{ 524.7 ng} )}{-47 }\)

k = 0.044\(days^{-1}\)

2) We find the half-life from the value of k we have just calculated:

\(t\frac{1}{2}\) =\(\frac{ln2}{k}\) = 15.7days

3) The number of half-lives of the unknown sample is:

Number of Half-lives = 47 days / 15.7 days = 3 (approx.)

Hence 3 is a correct answer.

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First base abstract a proton from acidic hydrogen gives carbanion.

What is a carbon atom?

Here First base abstract, a proton from acidic hydrogen gives carbanion

Which undergoes enolate form, then it reacts with CH3I, gives4-methyl-3-hexanone as below:

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Answer: The glass cup falling

Explanation:

It didnt change chemically, only its physical appearance

Answer:

Solution given:

1:

1 mole of aluminum =26.98 gram

8 mole =26.98*8=215.84 gram

8.00 moles of aluminum =215.84grams.

2:

1 mole of aluminum chloride =133.34 grams

10.5 moles of aluminum chloride =133.34*10.5=1400.07 grams

10.5 moles of aluminum chloride =1400 grams.

#1

1mol.of Al=27g

8mol of Al=27(8)=216g

#2

Molar mass of AlCl3=133.5g/mol

1 mol of AlCl3=133.5g

10.5mol.of AlCl3=10.5(133.5)=1401.75g

Answer:

(1)There are 1.5 moles of water in a 27 gram sample of water. The molar mass of water is 18.02 gmol g m o l .(2)

AnswersChemistryGCSEArticle

What is the mass (g) of 0.25mols of NaCl?

What you need for these equations are a calculator, periodic table and the following equation:

Mass (g) = Mr x Moles (important equation to remember)

In this case we already know the moles as it's in the question, 0.25 moles.

to find the Mr, you need to look at your periodic table. Find the relative atomic mass of Na and Cl and add the two numbers together.

Na = 22.99

Cl = 35.45

NaCl = 58.4

Now just put all of the numbers into the equation.

0.25 x 58.4 = 14.6g

Answer:

The total energy absorbed is 32.171 kilojoules.

Explanation:

The total energy absorbed by the ice is the sum of the sensible heat of ice and water and the latent heat of fusion of the water, that is:

\(Q = m\cdot [c_{i}\cdot (T_{2}-T_{1})+L_{f} + c_{w}\cdot (T_{3}-T_{2})]\) (1)

Where:

\(m\) - Mass of the ice, in kilograms.

\(c_{i}\) - Specific heat of ice, in kilojoules per kilogram-degree Celsius.

\(c_{w}\) - Specific heat of water, in kilojoules per kilogram-degree Celsius.

\(L_{f}\) - Latent heat of fusion, in kilojoules per degree Celsius.

\(T_{1}\) - Initial temperature of water, in degrees Celsius.

\(T_{2}\) - Fusion point of water, in degrees Celsius.

\(T_{3}\) - Final temperature of water, in degree Celsius.

\(Q\) - Total energy absorbed, in kilojoules.

If we know that \(m = 50.5\times 10^{-3}\,kg\), \(c_{i} = 2.090 \,\frac{kJ}{kg\cdot^{\circ}C}\), \(c_{w} = 4.180\,\frac{J}{kg\cdot ^{\circ}C}\), \(L_{f} = 334\,\frac{kJ}{kg}\), \(T_{1} = -15\,^{\circ}C\), \(T_{2} = 0\,^{\circ}C\) and \(T_{3} = 65\,^{\circ}C\), then the total energy absorbed is:

\(Q= (50.5\times 10^{-3}\,kg)\cdot \left[\left(2.090\,\frac{kJ}{kg\cdot ^{\circ}C} \right)\cdot (15\,^{\circ}C) + 334\,\frac{kJ}{kg}+ \left(4.180\,\frac{kJ}{kg\cdot ^{\circ}C} \right)\cdot (65\,^{\circ}C)\right]\)\(Q = 32.171\,kJ\)

The total energy absorbed is 32.171 kilojoules.

Answer:

Hello! so this is what I was able to find related to your question.

Explanation:

The oxidation number of this molecule, called a bromate molecule, is    -1.  It should be correctly written BrO3-.  It has this net charge of negative 1 because the bromine has an oxidation number of +5, while oxygen has it's normal oxidation of -2.

Answer:

It was deflected by a magnet charged particles

Explanation:

Stoichiometry

Theoretical yield

-----------

Step 1

The reaction involved:

FeTiO3 + H2SO4 => TiO2 + FeSO4 + H2O (completed and balanced)

-----------

Step 2

Data provided:

725.0 g FeTiO3 => the limiting reactant

H2SO4 excess

----

Data needed:

The molar masses of:

FeTiO3)

TiO2) 79.8 g/mol

FeSO4)

H2O) 18.0 g/mol

The heat of fusion of water is 79.9 cal/g. If a 7.2 g piece of ice melts in 105 g of water at 34.3 deg C in an insulated bottle, 35071.6 °C is the  final temperature of the water.

The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature. Thermometers are calibrated using a variety of temperature scales, which historically defined distinct reference points or thermometric substances.

The most popular scales were the Celsius scale, sometimes known as centigrade, with the unit symbol °C, the scale of Fahrenheit (°F), or the Kelvin scale (K), with the latter being mostly used for scientific purposes.

Δ T = T(initial) - T(final)

T(final)= m × c × q - T(initial)

T(final)= 79.9 x 4.184 x 105 - 30.0

T(final)= 35071.6 °C

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Answer:

because those are the only thermometers that are truly accurate for kelvins

Explanation:

The Kelvin temperature in thermometers is used by scientists because it provides a temperature where zero indicates the complete absence of thermal energy.

All thermometers have a scale on them that we use to find the temperature, known as a temperature scale. Kelvin proposed that the temperature interval from the ice point to the steam point be defined as 100° containing earlier centigrade scales.

Lord Kelvin had given an absolute temperature scale based on the Carnot cycle.  The zero point is 273.15 on Kelvin’s scale below that of the Celsius scale.

On the kelvin scale, Each division is called a Kelvin (K) and is equal to a degree on the Celsius scale. On the Celsius scale, zero degrees is the freezing point of water while on the Kelvin scale the zero point is at absolute zero temperature.

Therefore, 0 K is equal to - 273.15°C, and 0°C is equal to 273.15 kelvins. A mathematical expression that gives the relation between the Celsius and Kelvin scales:

Temperature (K) = Temperature (°C) + 273

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Answer:

a) 2.29E4

Explanation: 1kg = 1000g. to get mass in grams multiply 22.9 kg by 1000g then divide by 1 kg to cancel the kg.

b)  2,29E5 g

c) 2.29 E10 μg

Answer:

Wash hands and surfaces often. Harmful bacteria can spread throughout the kitchen and get onto cutting boards, utensils, and counter tops. To prevent this: Wash hands with soap and hot water before and after handling food, and after using the bathroom, changing diapers; or handling pets.

At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

1: Write the balanced chemical equation:

\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)

2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.

Initial:

\(C_O\)(g) = 0.3500 mol

\(Cl_2\)(g) = 0.05500 mol

\(C_OCl_2\)(g) = 0 mol

Change:

\(C_O\)(g) = -x

\(Cl_2\)(g) = -x

\(C_OCl_2\)(g) = +x

Equilibrium:

\(C_O\)(g) = 0.3500 - x mol

\(Cl_2\)(g) = 0.05500 - x mol

\(C_OCl_2\)(g) = x mol

3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:

Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]

4: Substitute the given equilibrium constant (Kc) value into the expression:

1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)

5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:

1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x

6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.

7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.

8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):

\(Cl_2\)(g) = 0.05500 - x

9: Calculate the value of \(Cl_2\)(g) at equilibrium:

\(Cl_2\)(g) = 0.05500 - x

\(Cl_2\)(g) = 0.05500 - (positive value of x)

10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.

Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

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Answer:

1, C, Xe 2, B,He

Explanation:

1, cause as u go down a group the boiling point increases.

2, boiling point of single element is greater than a compound

According to  periodic trends in periodic table boiling point increases down the  group and hence Xe has highest boiling point and more amount of heat is required to boil an element hence He has highest boiling point.

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

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