The density of the object is 3.0 g/mL.

What is its density in g/cm3?
density = [?] g/cm³

​

Answer:

$9.97/kg

Explanation:

$4.53      2.2 lb      $9.97

-------  X --------    =   --------

 lb            kg             kg

The formula is written for the compound as C3OBr6

The empirical formula is the simplest whole number ratio of the atoms of the elements present in a compound. It represents the lowest whole number ratio of atoms in a molecule of a chemical substance. The empirical formula is determined by analyzing the elemental composition of a compound, either through chemical analysis or spectroscopic techniques.

We would then have that;

C - 6.8/12   O - 3.0/16    Br - 90.2/80

C - 0.57    O - 0.19   Br - 1.12

Dividing through by the lowest ratio we have;

C - 3    O -   1    B r -  6

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Answer:

(a) GaF3, gallium(III) fluoride

(b) LiH, lithium hydride

(c) AlI3, aluminum(III) iodide

(d) K2S, potassium sulfide

Spaced practice is a learning strategy where the time between learning sessions is increased over time.

In this approach, material is studied multiple times, with increasing intervals between each session. This type of practice is thought to enhance long-term retention and improve memory compared to massed practice, where all the material is studied in one single session.

Spaced practice is often used in education and training programs, especially for subjects that require memorization or recall of information. The idea behind spaced practice is that it allows time for the material to be consolidated in memory, rather than simply being repeated in short-term memory.

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In this question , we will have to calculate the wavelength for each of the given answer choices, the shortest wavelength is the answer .

1. n = 3 to n = 1

we will use rydberg formula for wavelength : let represent wavelength.

1/ = RH * z^2 ( 1/n1^2 - 1/n2^2) ......{n1 = 1 , n2 = 3}

1/ = RH * z^2( 1/1-1/9)

1/ = 1.09x10^7*1 (8/9)

∴ =1.03x10^-7

2. n = 2 to n = 1

1/ = RH * z^2 ( 1/1^2 - 1/2^2)

=1.09x10^7*1 ( 3/4)

1/ =8175000

∴ =1.22x10^-7

3. n = 4 to n = 1

1/ = -10218750

∴ = -9.7x10^-8

4 . n = 4 to n = 3

1/ = -529861.1

∴ = -1.88x10 ^-6

5. n = 4 to n = 2

1/ = -4768750

∴ =-4.89x10^-7

• Finally, we can see that option C is the most negative value, ,∴, = -9.7x10^-8

Answer:

66 grams of ice would have to melt to lower the temperature of 352 mL of water from 15 °C to 0 °C.

Explanation:

To calculate the amount of ice that would have to melt to lower the temperature of 352 mL of water from 15 °C to 0 °C, we need to use the formula:

Q = m_water * c_water * ΔT_water + m_ice * Lf

where,
Q = the amount of heat transferred,
m_water = the mass of water, c_water is the specific heat capacity of water,
ΔT_water = the change in temperature of water, m_ice = the mass of ice,
Lf = the specific latent heat of fusion of ice.

First, let's calculate the amount of heat transferred to the water:

Q = m_water * c_water * ΔT_water
Q = 352 g * 1.0 cal/(g*°C) * (15-0) °C
Q = 5,280 cal

Next, we can use the specific latent heat of fusion of ice, which is 80 cal/g, to calculate the amount of heat required to melt the ice:

Q = m_ice * Lf
Q = m_ice * 80 cal/g
m_ice = Q / Lf
m_ice = 5,280 cal / 80 cal/g
m_ice = 66 g

The isotope that is being produced when tungsten-179 absorbs an electron is called Tantalum(Ta).

Isotopes are atoms that have the same number of protons but with a different mass number.

In radioisotopes, isotopes can be radioactive in nature and are formed by the absorption of an electron via -beta particle formation.

Tungsten is an atomic element with an atomic number 74 and a chemical symbol W, when tungsten-179 absorbs an electron, Tantalum (Ta) is formed.

i.e.

\(\mathbf{^{179}_{74}W + \ ^{0}_{-1}e \to ^{179}_{73}Ta }\)

Therefore, we can conclude that the isotope produced when tungsten-179 absorbs an electron is Tantalum(Ta).

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Answer:

.

Explanation:

Answer:a substance made by mixing other substances together.

Explanation:trust me

The ΔHrxn for the neutralization reaction between aqueous NaOH and HCl is -994.6 kJ/mol HCl.

Given that A 100.0 mL sample of 0.255 M NaOH is mixed with a 100.0 mL sample of 0.200 M HCl in a coffee cup calorimeter.  Both solutions were initially at 20.00°C and the temperature of the resulting solution was recorded as 37.00°C.  

We are to determine the ΔHrxn (in units of kJ/mol HCl) for the neutralization reaction between aqueous NaOH and HCl.  The balanced chemical equation for the neutralization reaction between aqueous NaOH and HCl is

 NaOH (aq) + HCl (aq) → NaCl (aq) + H2O  

(l)First, we need to determine the limiting reactant. It is necessary to identify the limiting reactant in order to calculate the moles of HCl reacted in the reaction and use it to determine ΔHrxn.  

Limiting reagent is the reactant that will be completely used up first, stopping the reaction. The reactant that is not completely consumed is the excess reactant.

We can use the concept of Stoichiometry to identify the limiting reactant.  To determine the limiting reactant, we can use the following formula:  

Molarity (M) = moles of solute (mol) / liters of solution (L) For NaOH, molarity (M) = 0.255 M For HCl, molarity (M) = 0.200 M.

Let's calculate the moles of NaOH and HCl:

Moles of NaOH = Molarity (M) × Volume (L)Moles of NaOH = 0.255 M × 0.100 L = 0.0255 mol

Moles of HCl = Molarity (M) × Volume (L)

Moles of HCl = 0.200 M × 0.100 L = 0.0200 mol

As we can see, the number of moles of NaOH is more than the number of moles of HCl.   NaOH is present in excess, while HCl is limiting.

The amount of HCl determines how much NaOH reacts, so we will use the number of moles of HCl to determine ΔHrxn.Next, we can calculate the amount of heat absorbed by the reaction:

qrxn = – qcal where qrxn = heat absorbed by the reactionqcal

= heat released by the calorimeterqcal

= (mass of water + mass of calorimeter) × specific heat of water × ΔTqcal = (200.0 g + 50.0 g) × 4.184 J/g·°C × (37.00°C – 20.00°C)

= 19,892 J or 19.892 kJqrxn

= – 19.892 kJ  (because no heat is lost to the calorimeter or the surroundings)

Next, we can use the equation below to calculate ΔHrxn:ΔHrxn = qrxn / n ΔHrxn = -19.892 kJ / (0.0200 mol × (-1)) = 994.6 kJ/mol HCl (Negative sign indicates that the reaction is exothermic).

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Answer:

Continental drift describes one of the earliest ways geologists thought continents moved over time. Today, the theory of continental drift has been replaced by the science of plate tectonics.

Explanation:

Answer:

a giant landmass where all the continents were connected

Explanation:

Pangea was C-shaped, with the bulk of its mass stretching between Earth's northern and southern polar regions. The curve of the eastern edge of the supercontinent contained an embayment called the Tethys Sea, or Tethys Ocean. The Paleo-Tethys Ocean took shape during Pangea's initial assembly phase.

Answer:

4650.0

Explanation:

Answer:

1. It will take the shape of its container. Particles can move about within a liquid, but they are packed densely enough that volume is maintained. Gaseous matter is composed of particles packed so loosely that it has neither a defined shape nor a defined volume. A gas can be compressed

2.  However after pouring the water from one short glass into a tall glass,  to be the same amount after being poured into any other container

3. Yes, wood have a fixed shape. Explaination: The reason is that it's solid and solids have a definite volume and shape. ... They have shapes that do not change and volumes that can be measured

4. Water is known to exist in three different states; as a solid, liquid or gas. Clouds, snow, and rain are all made of up of some form of water. A cloud is comprised of tiny water droplets and/or ice crystals, a snowflake is an aggregate of many ice crystals, and rain is just liquid water

5. Solids are sometimes formed when liquids or gases are cooled; ice is an example of a cooled liquid which has become solid. Other examples of solids include wood, metal, and rock at room temperature

6. For example, water commonly exists in three states of matter: solid (ice), liquid (water), and gas (steam)

Explanation:

plzzzzzzzzzzzzzz give brainly

1. It will adopt its container's shape. Within a liquid, particles can move around, yet the volume is maintained because of the liquid's dense packing. Particles in gaseous stuff are arranged so haphazardly that neither their shape nor their volume can be determined.

The term liquid is defined as substance which is not solid but which flows and can be poured and take a shape of container. water is an example of liquid.

2. However, the same amount of water would be poured into any other container after being transferred from one short glass to a tall glass.

3. The shape of wood is fixed. It's solid, and solids have a distinct volume and shape, which explains why. They have measurements-able volumes and unchanging forms.

4. There are three recognized states of water: solid, liquid, and gas. Snow, rain, and clouds are all composed of water in some way. A snowflake is an accumulation of several ice crystals, a cloud is made up of microscopic water droplets and/or ice crystals, and rain is just liquid water.

5. When liquids or gases are chilled, solids can occasionally form; ice is an example of a cooled liquid that has solidified. At room temperature, solids also include wood, metal, and rock.

6. As an illustration, water typically exists in three states: solid (ice), liquid (water), and gas (steam).

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Answer

If the mass was found to be 400.3 grams when measured with platform balance, measuring the mass on an analytical balance will improve the accuracy of the density determination because an analytical balance measure with a high degree of accuracy (will weigh to an accuracy of ± 0.1 mg and must be used whenever you desire four or more significant figure accuracy).

A muffi n recipe calls for cream of tartar, or potassium hydrogen tartrate. The amount of cream of tartar that is required contains 2.56 ×10²³atoms of carbon. 0.42moles of potassium hydrogen tartrate is required

In the Global System of Units (SI), the mole represents the unit of material quantity. How many fundamental entities of a particular substance are present within an object a sample is determined by the quantity of that material. An elementary entity can be a single atom, a molecular structure, an ion, a charged particle pair, or a particle that is subatomic like a proton depending on the makeup of the substance.

For instance, despite the fact that the two substances have different volumes and masses, 10 moles of water because 10 moles of the chemical element mercury both contain the same quantity of stuff, because the mercury comprises exactly one particle for each molecule of water.

mole = 2.56 ×10²³/ 6.022×10²³

       = 0.42moles

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A food chain refers to the order of events in an ecosystem, where one living organisms eats another organisms and later that organism is consumed by another larger organism. It also explains the feeding pattern.

The food chain is a linear sequence of organisms where the nutrients and energy is transferred from one organism to the other. It begins with the producer and ends with decomposer.

The producers in a food chain consists of all autotrophs like phytoplankton, algae and green plants. It is the producers which utilize the energy from the sun to produce food.

Thus the correct option is B.

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Solids have a Defined shape and defined volume. A solid has an exact quantity and shape, a liquid has a definite extent but no exact shape and gasoline has neither a particular volume nor shape.

Volume is the measure of the potential that an object holds. for instance, if a cup can maintain 100 ml of water as much as the brim, its volume is stated to be one hundred ml. extent can also be defined as the quantity of space occupied by a three-dimensional item.

Volume is the degree of the 3-dimensional area occupied by means of matter or enclosed by a surface, measured in cubic gadgets. The SI unit of quantity is the cubic meter (m3), which is a derived unit. Liter (L) is a unique call for the cubic decimeter (dm3).

Special approaches to discovering volume:-

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The current passing through the electrolytic cell is approximately 2.02 x 10^4 Amperes.

To calculate the current in amperes, we need to use Faraday's laws of electrolysis and the stoichiometry of the reaction.

Faraday's laws state that the amount of substance produced or consumed during electrolysis is directly proportional to the quantity of electricity passed through the cell. The relationship is given by:

Q = nF

Where Q is the electric charge in coulombs (C), n is the number of moles of substance involved in the reaction, and F is Faraday's constant, which is equal to 96,485 C/mol.

In this case, the substance being produced is Cl2, and we know the mass of Cl2 produced, which is 4.8 x 10^5 g.

First, we need to calculate the number of moles of Cl2 produced:

Molar mass of Cl2 = 35.45 g/mol

Moles of Cl2 = mass / molar mass = (4.8 x 10^5 g) / (35.45 g/mol) ≈ 1.354 x 10^4 mol

Now we can calculate the quantity of electricity passed through the cell using Faraday's laws:

Q = nF

Q = (\(1.354 x 10^4\)mol) * (96,485 C/mol)

Q ≈ 1.308 x 10^9 C

The quantity of electricity is given in coulombs. To find the current, we need to divide this value by the time in seconds.

Given that the time is 18 hours, we convert it to seconds:

Time = 18 hours * 60 minutes/hour * 60 seconds/minute

Time = 6.48 x 10^4 seconds

Finally, we can calculate the current:

Current (I) = Q / Time

I = (1.308 x 10^9 C) / (6.48 x 10^4 s)

I ≈ 2.02 x 10^4 Amperes

Therefore, the current passing through the electrolytic cell is approximately 2.02 x 10^4 Amperes.

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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:

0.12 M

Explanation:

Step 1: Write the balanced equation

NaOH + HCl ⇒ NaCl + H₂O

Step 2: Calculate the reacting moles of NaOH

10 mL of a 0.30 M NaOH solution react.

\(0.010L \times \frac{0.30mol}{L} = 3.0 \times 10^{-3} mol\)

Step 3: Calculate the reacting moles of HCl

The molar ratio of NaOH to HCl is 1:1. The reacting moles of HCl are 1/1 × 3.0 × 10⁻³ mol = 3.0 × 10⁻³ mol.

Step 4: Calculate the concentration of HCl

3.0 × 10⁻³ mol of HCl are in 25 mL of solution.

\(M = \frac{3.0 \times 10^{-3} mol}{0.025L} = 0.12 M\)

Answer:

helium i think

Explanation:

The octet rule is the understanding that most atoms seek to gain stability in their outer most energy level by filling the s and p orbitals of the highest energy level with eight electrons.

Nitrogen has an electron configuration of 1s²2s²2p³ this means that nitrogen has five valence electrons 2s²2p³ .

Nitrogen seeks out three additional electrons to fill the p orbital and gain the stability of a noble gas, 1s²2s²2p⁶ .

However, now nitrogen has 10 electrons and only 7 protons making it a -3 charge anion

N−³.

The expression 7.0x\(10^7\) ÷ 2.0x\(10^4\) can be expressed in proper scientific notation as 3.5x10^3.

To express the division 7.0x\(10^7\) ÷ 2.0x\(10^4\) in proper scientific notation, we need to perform the division and adjust the result to the appropriate format.

Dividing the numbers, we get:

7.0x\(10^7\) ÷ 2.0x\(10^4\)= 3.5x\(10^{(7-4)\)= 3.5x\(10^3\)

The result of the division is 3.5, and we adjust the exponent by subtracting the exponent of the divisor from the exponent of the dividend (7 - 4 = 3).

Therefore, the proper scientific notation representation of the division 7.0x\(10^7\) ÷ 2.0x\(10^4\) is 3.5x\(10^3\).

Scientific notation is a way to express numbers using a coefficient (in this case, 3.5) multiplied by a power of 10 (in this case, 10^3). It allows for more concise representation of very large or very small numbers.

In this case, the division resulted in a number that is smaller than the dividend and has a positive exponent, indicating a smaller magnitude compared to the original numbers. The coefficient represents the significant digits of the result, while the power of 10 represents the scale or magnitude of the number.

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Answer:

It is a noble gas

Explanation:

It can form some compounds under various extreme conditions

Answer:

this is Ar, a noble gas, a gas at STP and are basically has little chemical reactivity,

aplanation

:he electron configuration of an element is shown below.

1s^2 2s^2 2p^6 3s^2 3p^6

Based on the electron configuration, write one chemical property of this element.

all of the s an p orbitals ae filled, so this is a noble gas  with atomic # =

2 + 2 + 6 + 2 + 6 = 18 so

this ie element #18 and is Argon,Ar

all noble gases are gases at STP and are basically hae little chemical reactivity,a

The balanced chemical equation for the decomposition of aspirin (acetylsalicylic acid) is:

\(2C_{9}H_{8}O_{4} (aspirin) → 2C_{7}H_{6}O_{3} (salicylic acid) + 2CO_{2} (Carbon dioxide) + H_{2}O (water)\)

In this reaction, the aspirin molecule breaks down into salicylic acid, carbon dioxide, and water. The reaction is typically catalyzed by heat or exposure to acidic or basic conditions.

Aspirin, or acetylsalicylic acid, contains ester functional groups that can undergo hydrolysis. Under suitable conditions, the ester bond in aspirin is cleaved, leading to the formation of salicylic acid, which is the primary decomposition product. Additionally, carbon dioxide and water are released as byproducts of the reaction.

The balanced equation shows that for every two molecules of aspirin, two molecules of salicylic acid, two molecules of carbon dioxide, and one molecule of water are formed. Understanding the decomposition of aspirin is important in pharmaceutical and chemical industries to ensure the stability and shelf-life of the compound, as well as to study its breakdown products and potential side reactions.

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If 10.5 g of Ag and 7.5 g of S are reacted and 9.8 g of  \(Ag_2S\) is obtained, the percent yield of the reaction would be 81.4%

Ag and S react to form \(Ag_2S\) as follows:

\(2Ag + S -- > Ag_2S\)

The mole ratio of Ag to S is 2:1.

10.5 g of Ag = 10.5/108

                     = 0.0972 moles

7.5 g of S = 7.5/32

                = 0.2344 moles

In other words, Ag is limiting in availability.

The mole ratio of Ag to  \(Ag_2S\) = 2:1

0.0972 Ag is equivalent to 0.0972/2 = 0.0486 moles of  \(Ag_2S\)

0.0486 moles  \(Ag_2S\) weighs = 0.0486 x 247.8

                                              = 12.04 grams

percent yield of  \(Ag_2S\) = 9.8/12.04 x 100%

                                   = 81.4%

The percent yield of \(Ag_2S\) that the chemist actually obtained is 81.4%.

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In order to find the limiting reactant we will need to first set up the properly balance equation, which the question already provided us:

4 NH3 + 5 O2 -> 4 NO + 6 H2O

Now from the information in the question we have:

3.25 g of NH3

3.50 g of O2

We will need their molar mass in order to find how many moles of each compound we actually have:

O2 = 32 g/mol

NH3 = 17.03 g/mol

As we can see, in a regular reaction, we will have a 4:5 molar ratio between NH3 and O2, which means that for every 4 moles of NH3 we will need 5 moles of O2 in order to proceed in the reaction, not let's find the number of moles in NH3

17.03 g = 1 mol

3.25 g = x moles

x = 0.19 moles of NH3

Now we will use the molar ratio to find the number of moles of O2

4 NH3 = 5 O2

0.19 NH3 = x O2

x = 0.24 moles

Now we need to check if 0.24 moles of O2 is under the 3.50 grams of mass, if the mass is below 3.50, we have an excess of O2, therefore the limiting reactant will be NH3, if we have a mass above 3.50, this means that we actually have an excess of NH3, and the limiting reactant is O2

32 g = 1 mol

x grams = 0.24 moles

x = 7.68 grams, which is above 3.50, which means that the limiting reactant is O2 and we have an excess of NH3

A) Oxygen gas, O2

Now for letter B

We have to use the limiting reactant to find out how much is the mass of the product, so let's use O2, which has 3.50 g of mass and molar mass of 32 g/mol

32 g = 1 mol

3.50 g = x moles

x = 0.11 moles of O2

The molar ratio is 5:4, 5 moles of Oxygen gas for 4 moles of NO, this in a regular situation, but we have 0.11 moles of O2, for NO will be:

5 O2 = 4 NO

0.11 O2 = x NO

x = 0.09 moles of NO

Now we have to find the mass, we will use its molar mass, which is 30.01 g/mol

30.01 g = 1 mol

x grams = 0.09 moles

x = 2.7 grams of NO

b) 2.7 grams of NO

For letter C

We already know that the oxygen gas is the limiting reactant, and we have 0.11 moles of O2 in the reaction, let's find out how many grams are in excess in 3.25 g of NH3, again we are going to use molar ratio 4:5

4 NH3 = 5 O2

x NH3 = 0.11 O2

x = 0.09 moles of NH3

Using the molar mass of NH3 we will end up with

17.03 g = 1 mol

x grams = 0.09 moles

x = 1.53 grams of NH3

Now we only need to subtract this from 3.25 g

3.25 - 1.53

We have an excess of 1.72 grams of NH3

c) 1.72 grams of NH3

Answer:

The end point of a titration is the point at which the reaction between the analyte (the substance being analyzed) and the titrant (the solution being added to the analyte) is complete. The end point is usually determined by a change in the color of the solution, and this change is typically caused by an indicator added to the analyte solution.

The indicator is a substance that changes color at or around the pH at which the reaction is complete. The indicator is chosen based on the properties of the analyte and titrant, and the pH range over which the reaction occurs. Common indicators include phenolphthalein, bromothymol blue, and methyl orange.

For example, when titrating a strong acid (like HCl) with a strong base (like NaOH), phenolphthalein is often used as the indicator. The phenolphthalein molecules are colorless in acidic solution, but they turn pink in basic solution. As the NaOH is added to the HCl, the solution becomes increasingly basic. Once the pH reaches the endpoint, the indicator turns pink. This indicates that the reaction is complete and no further addition of NaOH is required to completely react with the HCl.

The endpoint determination is critical in performing accurate titrations. The endpoint must be identified accurately and consistently in order to obtain reliable and reproducible results.

A titration is a technique that is used to measure the concentration of an unknown substance in a solution using a standard solution with a known concentration. The endpoint of a titration is the point at which the reaction between the two solutions is complete, and no more titrant (standard solution) is needed to react with the analyte (unknown substance). There are several ways to recognize the endpoint of a titration, including:1. Indicators: An indicator is a substance that changes color when the endpoint is reached.

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