Recorded observations are called:

data
information
impressions
feelings
ideas

Answer:

Density

Explanation:

Density is not unique only to water. All liquids have density. Liquids have density either higher or lower than that of water. All liquids have mass and they occupy the volume of the container in which they are kept. Density is the ratio of mass to volume.  

Density = mass/ volume.  

As all liquids have mass and volume they also have density.  

A. He left blanks for them in his periodic table, as he predicted they would be discovered.

Answer:

Option d, 1s2 2s2 2p6 3s2 3p6 4s2

Explanation:

Alkaline earth metals belong to group 2 of the periodic table. Elements belonging to group 2 are beryllium, magnesium, calcium, strontium and barium and radium.

Alkaline earth metals have 2 valence electrons and these two electrons are filled in outermost s sub shell.

General electronic configuration of alkaline earth metal: ns^2

In ionized state, number of electrons in s sub shell will not be 2.

Among the given, only 1s2 2s2 2p6 3s2 3p6 4s2, has 2 electrons in s sub shell. So, it an electronic configuration of neutral alkaline earth metal.

The correct answer to the question is Option D. 1s² 2s²2p⁶ 3s²3p⁶ 4s²

Alkaline earth metals are metals belonging to the group 2 of the periodic table.

They have 2 valence electrons.

Now, we shall determine which of the option given above that has  valency of 2 electrons

1s² 2s¹

Valence electron shell = 2s¹

1s² 2s²2p²

Valence electron shell = 2s²2p²

Valence electron = 2 + 2

1s² 2s²2p⁶ 3s¹

Valence electron shell = 3s¹

1s² 2s²2p⁶ 3s²3p⁶ 4s²

Valence electron shell = 4s²

From the illustraton made above, we can see that only Option D has a valence electron of 2.

Therefore, the correct answer to the question is Option D. 1s² 2s²2p⁶ 3s²3p⁶ 4s²

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There are four sublevels s, p, d ,f   2 in the s

Answer:

Climate

Explanation:

Weather is like the temperature over time

The elevation is height like the elevation on a mountain
Conditions like its rainy or cloudy

Climate is the certain weather over a period of time.

The average weather pattern of a region over a long period of time is known as climate. The changes in climate occurs due to the change in heat and light radiated from  sun.

Weather is the scientific term used to indicate the atmospheric condition of a region over a short period of time. The difference in weather depends on the landscape of the region.

The different weather condition occurs in different latitudes of earth due to the difference in the heat and light radiated to these regions. The tilted axis of earth makes the heat radiation impact differently in each poles of earth.

The average weather pattern of a region over a long period of time is known as climate. The changes in climate occurs due to the change in heat and light radiated from  sun. Climates of various ecosystems alters with respect to the peculiarities of the biosystems there.

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Answer:- Molarity = 0.121M and normality = 0.121N.

Solution:- KHP that is potassium hydrogen phthalate reacts with sodium hydroxide as:

[tex]NaOH+KHP\rightarrow NaKP+H_2O[/tex]

From this equation, they react in 1:1 mol ratio. Grams of KHP are given so we could convert them to moles and the moles of NaOH would also be equal since the mol ratio is 1:1. Molar mass of KHP is 204.2 gram per mol.

[tex]1.24gKHP(\frac{1mol}{204.2g})(\frac{1molNaOH}{1molKHP})[/tex]

= 0.00607 mol NaOH

Volume of NaOH solution is 50.0 mL that is 0.0500 L. Molarity is moles of solute per liter of solution. So, let's divide the moles by the liters to get the molarity.

[tex]molarity=\frac{0.00607mol}{0.0500L}[/tex]

= 0.121 M

The molarity of NaOH solution is 0.121 M.

Normality is the grams equivalent per liter of solution.

For a base, normality = molarity* acidity

acidity means how many hydroxide ions would be given out from the base. It could also be calculated on dividing the molecular weight of the compound by it's equivalent weight.

Acidity of NaOH is 1 as it has only one OH present in it.

So, normality = 0.121(1) = 0.121 N

The answer is

[tex]\[ \boxed{\text{Molarity} \approx 0.1214 \text{ M}} \] \[ \boxed{\text{Normality} \approx 0.1214 \text{ N}} \][/tex]

To determine the molarity and normality of the NaOH solution, we need to perform a titration calculation. The reaction between NaOH and KHP (potassium hydrogen phthalate) is a neutralization reaction, and the balanced equation is:

[tex]\[ \text{NaOH} + \text{KHC}_8\text{H}_4\text{O}_4 \rightarrow \text{KNaC}_8\text{H}_4\text{O}_4 + \text{H}_2\text{O} \][/tex]

From the equation, we can see that the molar ratio between NaOH and KHP is 1:1.

First, we calculate the moles of KHP that reacted with the NaOH solution:

The molar mass of KHP [tex](\( \text{KHC}_8\text{H}_4\text{O}_4 \))[/tex]is:

[tex]\[ 39.10 (\text{K}) + 1.01 (\text{H}) + 12 \times 12.01 (\text{C}) + 4 \times 16.00 (\text{O}) + 1.01 (\text{H}) = 204.22 \text{ g/mol} \][/tex]

Now, we calculate the moles of KHP:

[tex]\[ \text{moles of KHP} = \frac{\text{mass of KHP}}{\text{molar mass of KHP}} = \frac{1.24 \text{ g}}{204.22 \text{ g/mol}} \approx 0.00607 \text{ mol} \][/tex]

Since the molar ratio between NaOH and KHP is 1:1, the moles of NaOH used in the reaction are also approximately 0.00607 mol.

Now, we can calculate the molarity of the NaOH solution:

[tex]\[ \text{Molarity} = \frac{\text{moles of solute}}{\text{liters of solution}} \][/tex]

Given that 50.0 ml of NaOH solution was used, we convert milliliters to liters:

[tex]\[ 50.0 \text{ ml} = 0.0500 \text{ L} \][/tex]

Then, the molarity (M) is:

[tex]\[ M = \frac{0.00607 \text{ mol}}{0.0500 \text{ L}} \approx 0.1214 \text{ M} \][/tex]

To find the normality (N) of the NaOH solution, we need to consider that normality is the measure of the concentration of a solution in terms of the number of gram equivalents of solute per liter of solution. For NaOH, which is a strong base, the gram equivalent weight is the same as its molar mass because it provides one mole of [tex]OH^-[/tex] ions per mole of NaOH.

The molar mass of NaOH is:

[tex]\[ 23.00 (\text{Na}) + 16.00 (\text{O}) + 1.01 (\text{H}) = 40.01 \text{ g/mol} \][/tex]

Since the gram equivalent weight of NaOH is the same as its molar mass, the normality is equal to the molarity:

[tex]\[ N = M \approx 0.1214 \text{ N} \][/tex]

Therefore, the molarity and normality of the NaOH solution are both approximately 0.1214.

There are 60 seconds in a minute. There are 60 minutes in an hour. There are 24 hours a day. There is 86400 seconds per day (24 hours). There are 168 hours per week (7 days). There are 720 hours in 30 days. 86,400 seconds divided by 60 seconds is 1440 seconds. 1440 seconds times 30 days is 43,200 minutes.

That gives us the answer.. 43,200 minutes are in 30 days.

131400 hope it helps.

The given equilibrium system has the number of reactant molecules are 4, and the number of product molecules are 2.

Equilibrium has been the condition that has been marked with the presence of equal number of product and reactant.

The given reaction has been:

[tex]\rm N_2\;+\;3\;H_2\;\leftrightharpoons\;2\;NH_3[/tex]

The number of atoms of each molecule on the product and the reactant side has been equal. The number of molecules has been the repeating unit for reactant and product.

The number of molecules on the reactant side has been the sum of hydrogen and nitrogen molecules. The number of hydrogen has been 3, while the number of nitrogen has been 1.

The total number of reactant molecule has been 4.

The number of product molecules, are 2 molecules of ammonia.

Thus, in the given equilibrium system, the number of reactant molecules are 4, and the number of product molecules are 2.

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why hello there

It depends of what kind of mineral you inhale if you inhale one of thease 9 you are in risk of dying

If my answer helped please mark me as brainliest thank you and have the best day ever!

Hey there!:

The 1s, 2s and 2p subshells are completely filled (a maximum of two electrons go into the 1s subshell and a maximum of two electrons go into the 2s subshell.  The 2p subshell includes 3 orbitals, with 2 electrons maximum per orbital).  The 3s subshell has only one of a maximum of two electrons.

Hope that helps!

Answer:

answer in picture

Explanation:

Each factor listed is classified as either a variable or constant based on how it is treated in gas behavior experiments, which helps in understanding the ideal gas law.

When considering the lab procedure related to the behavior of gases, we can label each factor with 'V' for variable or 'C' for constant, based on the information provided about gas laws.

Early scientists studied the relationship between gas variables, holding some factors constant while varying others to observe the effects on gas behavior—this concept is crucial in understanding the ideal gas law and gas properties.

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Answer:

The gold gains a total of 2.468 kilo-joules of energy.

Explanation:

Total heat or energy gained by the gold is equal to heat applied and heat required to melt the gold completely.

Total energy = Q+ Q'

Heat of fusion of gold =[tex]\Delta H_{fus} =63.5 joules/gram[/tex]

Mass of gold melted ,m= 12.5 g

Specific heat of gold ,c= 0.1291 joules/gram °C

Change in temperature = ΔT = 1064°C - 26°C = 1038 °C

Heat of applied to the gold = Q

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

[tex]Q'=\Delta H_{fus}\times m[/tex]

Total energy = Q+ Q'

[tex]=12.5 g\times 0.1291 joules/gram ^oC\times 1038 ^oC+63.5 joules/gram\times 12.5 g[/tex]

= 2,468.82 Joule= 2.468 kilo-Joule

The gold gains a total of 2.468 kilo-joules of energy.

Answer:  0.5 kilograms

Explanation:

One kilogram is equal to a thousand grams.

Supposing x to be the number of kilograms equal to 527 grams, we can write it as:

1 kg = 1000 grams

x kg = 527 grams

To solve for x, we can simply divide 527 grams by 1000 thousand grams to get the answer.

x = 527 / 1000

x = 0.527

Rounding this value to the nearest tenth, it will become 0.5 kilograms.

Given data:

Mass in grams = 527 g

Mass in kilograms = ?

Solution:

1 kilogram=1,000 grams

1 gram = 1/1000 kilograms

527 gram = 1/1000 * 527

527 grams = 0.527 kilogram

Round of answer: 00.5 kg

You get 0.54 but the calculated answer is 0.572.

So without round off you are wrong.

With round off you are correct.

a i took this test yesterday.

Answer: Organelles

Explanation:

The cell organelles are the basic structure that is present inside every cell which helps the cell to perform its survival activities and processes.

The various types of organelles in the cell helps in performing various functions. Such as the mitochondria helps in the conversion of carbohydrates into adenosine triphosphate.

The Golgi body in the cell helps in the sorting and modification of proteins. It helps in the transport the secretion of the cells after modifications.

Hence, the correct answer is Organelles.

I think I have done a question like this before and i'm pretty sure your answer would be the 2nd one 1s22s22p4. I'm not 100% sure but try it at least.

Answer:

electron configuration of carbon: 1s²2s²2p²

Explanation:

The electron configuration of atoms (or ions) is depicted based on the Aufbau principle according to which electrons are added to various orbitals such that the orbital with the lowest energy gets occupied first followed by the next higher orbital.

The energy ordering of orbitals from the lowest to the highest is:

1s < 2s < 2p < 3s < 3p < 4s  < 3d ....

s orbitals can accommodate a maximum of 2 electrons

p orbitals = 6 electrons

d orbitals = 10 electrons

Now, the atomic number of carbon = 6

Since it is neutral, the atomic number = number of electrons = 6

Based on the Aufbau principle the electron configuration of C would be

1s²2s²2p²

The measurement 6.4x10^3 g could be written as 6.4 kg in kilograms and as 6.4x10^6 mg in milligrams, considering the unit conversions.

The measurement 6.4x10^3 g can be expressed in other units. The use of scientific notation, such as 6.4x10^3, helps us write very large or very small numbers in a more manageable way. This notation means that you are multiplying 6.4 by 10 raised to the power of 3, or in other words, adding three more zeros to 6.4, which results in 6400.

To convert it to kilograms, we need to remember that 1 kilogram is equal to 1000 grams. So, we can divide the number of grams by 1000 to get the measurement in kilograms. Hence, 6.4x10^3 g = 6.4 kg. Similarly, we can convert it to milligrams, remembering that 1 gram equals 1000 milligrams, which results in 6.4x10^3 g = 6.4x10^6 mg.

Note:

Always remember to check the magnitude of the units you are converting to ensure accuracy.

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Yes, electron N or electron P have a transition that covered a greater energy difference.

Answer : Electron P has greater energy difference than the Electron N.

Explanation :  

Wavelength range of violet light = 400 - 500 nm

Wavelength range of orange light = 600 - 700 nm

The Planck's equation is,

[tex]E=\frac{h\times c}{\lambda}[/tex]

where,

E = energy of light

c = speed of light

[tex]\lambda[/tex] = wavelength of light

According to the Planck's equation, wavelength and energy follow inverse relation. As the wavelength increases, energy decreases.

From the given spectrum, the wavelength of violet light is less. We conclude that When electron P gives violet light on transition it means that energy difference between the energy level was high.

From the given spectrum, the wavelength of orange light is more. We conclude that When electron N  gives orange light on transition it means that energy difference between the energy level was low.

So, Electron P which gives violet light on transition has greater energy difference than the Electron N.

2.57 kilograms = 2570 grams

i think this is standard form but i don't know 100%

Remember that there are 1000 grams in 1 kilogram.

Multiply 1000 grams with 2.570 kilograms

1000 x 2.570 = 2570

2570 grams are in 1 kilogram

hope this helps

Frozen water,cool water,warm water,water vapor.

Final answer:

The order from least to greatest kinetic energy of water in different states is frozen water (ice), cool water, warm water, and water vapor, in accordance with the kinetic molecular theory which relates temperature and phase of matter to kinetic energy.

Explanation:

To rank the different states of water according to their kinetic energy from least to greatest, we must understand that kinetic energy is related to the temperature and phase of matter. The kinetic molecular theory (KMT) explains that as the temperature increases, so does the kinetic energy of the molecules in a substance. Therefore, molecules in the solid phase (ice) have the least kinetic energy because they are at the lowest temperature, while molecules in the gaseous phase (water vapor) have the most kinetic energy due to the highest temperature.

Frozen water (Ice) - Solid state with the lowest kinetic energy.

Cool water - Higher kinetic energy than ice, as it is a liquid at a lower temperature.

Warm water - Even higher kinetic energy, as it is liquid at a higher temperature.

Water vapor - Gas state with the highest kinetic energy.

Thus, the correct order from least to greatest kinetic energy is: frozen water (ice), cool water, warm water, and water vapor.

The appearance of small pieces of ice instead of ice cubes in the freezer can happen through a process called sublimation, in which ice transitions directly into a gaseous state, additionally influenced by thermal equilibrium as per the second law of thermodynamics.

Finding small pieces of ice instead of ice cubes in the freezer could be due to a process called sublimation, in which solids transition directly into the gaseous state, bypassing the liquid state. This is a common phenomenon for snow and ice at temperatures below the melting point of water. It's a slow process that can be accelerated by reduced atmospheric pressure in the freezer or sporadic variations in the temperature of the freezer. The varying conditions inside the freezer could cause ice cubes to break down into smaller pieces of ice.

Another contributing factor could be the thermal equilibrium dictated by the second law of thermodynamics. This law predicts that after heat transfers energy from the warmer freezer air to the colder ice, the components will eventually reach a thermal equilibrium. The continual transfer of energy could cause the ice cubes to reduce in size over time.

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Size

As the charge increases (becomes more positive), the size decreases.

Also the number of protons and electrons matters in the atom itself. Li will have the smallest size because their are not that many electrons to repulse as say the Ca and K.

The largest member of that group is the one having the most number of electrons and is not an ion. In general the higher the charge, the smaller the radius.

K > K+ > Ca2+

Answer: A

Ionization Energy

As you go down the periodic table staying in the same column of the periodic table it takes LESS energy to break the outer shell electrons away. So the correct order for the column II elements is something like D.

Be is closest to the top of the periodic table and has the highest  ionization energy

Ca is the next closest to the top and has a medium size ionization energy

Sr has the lowest ionization energy.

Answer C is backwards.

Answers A B and E are all in the wrong order  of moving down Column II. The comment applies to staying in the same column and moving from top to bottom.

Polymers

A polymer is a complex combination of Carbon, Hydrogen and Oxygen (mainly). Other elements are possible but the majority is the listed ones.

DNA is a polymer

A glass bottle is made from SiO2 and is not a polymer

Ice crystals are actually water molecules. Those crystals are not polymers

Hair Proteins (like wool and silk) are made of polymers.

Rubber used for car tires are polymers.

You should count 3 items as your answer.

Answer:

AK

Explanation:

Answer:- 1.8 L

Solution:- The given volume is 1838 mililiters and we are asked to convert it to liters. We know that:

[tex]1mL=(\frac{1}{1000})L[/tex]

Where, mL stands for mililiters and L stands for liters.

Let's make the set up using this conversion factor to convert the given mL to L.

[tex]1838mL(\frac{1L}{1000mL})[/tex]

= 1.838 L

They asks to round the answer to the nearest tenth. So, it becomes 1.8 L.

Answer: A.  NO increases the rate at which [tex]SO_3[/tex] molecules are formed.

Explanation: The catalyst makes it possible for the reaction to take place by another path that makes possible reaction at a lower energy.

Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.

A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more reactants [tex](SO_2)[/tex] and [tex](O_2)[/tex] undergo collision and can cross the energy barrier and convert to products [tex](SO_3)[/tex]

Thus NO increases the rate at which [tex]SO_3[/tex] molecules are formed.

Answer:

The answer above is correct

A.  NO increases the rate at which  molecules are formed.

Explanation:

a physical property would be a. boiling poing

Answer: A) boiling point

Explanation:

Chemical property is defined as the property of a substance which is observed during a reaction where the chemical composition identity of the substance gets changed.

Physical property is defined as the property which can be measured and whose value describes the state of physical system. For Example: State, density etc.

Boiling point is a physical property as it involves change of state.

Flammability is a chemical property as there is formation of new substances.

Reactivity is a chemical property as there is formation of new substances.

Toxicity  is a chemical property as there is formation of new substances.

Answer:

Na₂S + FeBr₂ → 2NaBr + FeS(s)

MgSO₄ + CaCl₂ → MgCl₂ + CaSO₄(s)

AgNO₃ + NaCl → AgCl(s) + NaNO₃

Explanation:

You must recall the pertinent solubility rules:

Na₂S + FeBr₂ → 2NaBr + FeS(s)

NaBr is soluble (Rule 1). FeS is insoluble (Rule 5), so a precipitate forms.

MgSO₄ + CaCl₂ → MgCl₂ + CaSO₄(s)

MgSO₄ is soluble (Rule 3). CaSO₄ is insoluble (Rule 4), so a precipitate forms.

AgNO₃ + NaCl → AgCl(s) + NaNO₃

NaNO₃ is soluble (Rule 1). AgCl is insoluble (Rule 3) so a precipitate forms.

LiOH + NH₄I → LiI + NH₄OH and 2NaCl + K₂S → Na₂S + 2KCl

All products are soluble (Rule 1), so these are not precipitation reactions.

HEY I GOT YO ANSWER

THE ANSWERS ARE A B AND DA LAST ONE

The empirical formula of the compound is K₂O.

Step 1. Calculate the moles of each element

The empirical formula is the simplest whole-number ratio of atoms in a compound.

The ratio of atoms is the same as the ratio of moles.

So, our job is to calculate the molar ratio of K to O.

Moles of K = 30.5 g K × (1 mol K/(39.10 g K) = 0.7801 mol K

Moles of O = 6.24 g O × (1 mol O/16.00 g O) = 0.3900 mol O

Step 2. Calculate the molar ratio of the elements

Divide each number by the smallest number of moles

Ni:F = 0.1552:0.3100 = 2.001:1 ≈ 2:1

Step 3: Write the empirical formula

EF = K₂O

The empirical formula for a compound composed of 30.5 g potassium and 6.24 g oxygen is K2O, as determined by calculating the molar ratio from the given masses and atomic weights.

To find the empirical formula of a compound, we first use the provided weights to calculate the mole ratio of the elements in the compound. We start with the mass of each element and convert it to moles by dividing by the atomic weight. In this case, we have 30.5 g of potassium (K = 39.10 g/mol) and 6.24 g of oxygen (O = 16.00 g/mol), which give us approximately 0.780 mol of potassium and 0.390 mol of oxygen.

To get the empirical formula, we then divide each of the mole quantities by the smallest value to get the subscript for each element. Therefore, our mole ratio is 2:1, resulting in the empirical formula being K2O.

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Answer:

D. Crust, as its depth is less than 100 kilometers

Explanation:

Answer: Option (d) is the correct answer.

Explanation:

When salt is added to water then the sodium and chlorine ions dissociate.

After the dissociation, both the positive and negative ions that is the sodium and chlorine ions will be surrounded by the water molecules. Thereafter, the positive part of water molecule will be attracted to the negative ions that is the chlorine ions and vice versa.

As sodium ion is a cation so it will hold a positive charge, and chlorine ion is an anion so it will hold a negative charge.

Thus, it can be concluded that when salt is added to water, all of the above will happen except option (d) that is the salt breaks into positive chlorine ions and negative sodium ions.