HELP ME PLEASE!! If given a graduated cylinder, a beaker with alcohol and a scale, explain the steps to find the mass of 40 mL of alcohol.

The rate of consumption of Ca is 0.0833 g/s.

The rate of consumption of Ca can be determined by dividing the mass of Ca consumed (2.50 g) by the time taken for the reaction to occur (30.0 seconds). This gives us a rate of 0.0833 g/s, indicating that 0.0833 grams of Ca are consumed every second during the reaction at the given temperature.

In chemical reactions, the rate of consumption or production of a substance is typically expressed in terms of the change in concentration over time. In this case, since the mass of Ca consumed is given, we can directly calculate the rate of consumption.

It's important to note that the rate of consumption of Ca may vary with temperature and other reaction conditions. The given rate applies specifically to the given temperature and the specific reaction conditions mentioned in the problem.

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Answer:

Magnesium burns in steam to produce white magnesium oxide and hydrogen gas with a bright flame

Explanation:

As per the balanced reaction, 2 moles of NaOH  reacts with 1 mole of Li₂S. Then, 18.7 g or 0.4 moles of lithium sulphide needs 0.8 moles of NaOH. But 23.4 g of NaOH is only 0.5 moles. Hence, NaOH is the limiting reactant.

A limiting reactant in a reaction is the reactant which is fewer in amount or consume early without complete reaction with other reactants. Hence, as soon as this reactant is consume, the reaction stops.

In the given reaction, 2 moles of NaOH  reacts with 1 mole of Li₂S. Then, 18.7 g or 0.4 moles of lithium sulphide needs 0.8 moles of NaOH.

Molar mass of NaOH = 40 g

Molar mass of LiOH = 23 g.

80 g of NaOH gives 46 g of LiOH. Then, the mass of LiOH produced from 23.4 g of NaOH is:

(23.4 ×46)/80 = 13.4 g

Therefore, the mass of LiOH produced will be 13.4 g.

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The reaction you're describing is a halogenation reaction where an unsymmetrical alkene reacts with a halogen (X2) and water (H2O) to form a halohydrin. The general reaction can be represented as follows:

Asymmetrical alkene + X2 + H2O → Halohydrin

For example, let's consider the reaction between propene (an asymmetrical alkene) and chlorine gas (Cl2) in the presence of water (H2O):

CH3CH=CH2 + Cl2 + H2O → CH3CH(Cl)CH2OH

In this reaction, the double bond of propene is broken and a chlorine atom is added to one carbon atom, while a hydroxyl group (-OH) is added to the other carbon atom.

This forms a halohydrin, which in this case is 2-chloropropanol. The reaction mechanism involves the formation of a cyclic intermediate called a halonium ion, which is then attacked by water to form the halohydrin.

Note that the halogenation of an unsymmetrical alkene can lead to the formation of different products, depending on the regioselectivity of the reaction. In the example above, the reaction is regioselective because the chlorine atom is added to the less-substituted carbon atom of the alkene.

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17.23 g of KBr is required to prepare 100 ml of a 1.5 M KBr solution.

To prepare 100 ml of a 1.5 M solution of KBr, you need to determine the amount of KBr in moles required to achieve the desired concentration. The formula for molarity is given as:

Molarity = moles of solute / liters of solution

Rearranging the equation to solve for moles, we get:

moles of solute = Molarity x liters of solution

In this case, the desired molarity is 1.5 M and the volume of solution is 100 ml, which is Equal to 0.1 liters. Plugging these values into the equation, we get:

moles of KBr = 1.5 x 0.1 = 0.15 moles

Next, we need to convert the number of moles to mass, using the molecular weight of KBr. The molecular weight of KBr is 114.91 g/mol. So, the mass of KBr required to prepare 100 ml of a 1.5 M solution is:

mass of KBr = 0.15 moles x 114.91 g/mol = 17.23 g.

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Answer:

16 protons and 19 neutrons

The chemical symbols for three different atomic cations that all have 19 protons : [Ca+] and [Sc2+] and [Ti3+]

Calcium:

Calcium have 20 electrons or it have 20 atomic number. Since an atom is a neutral species.

[Ca] = (1s2) (2s2) (2p6) (3s2) (3p6) (4s2)

After losing one electron atom gain positive charge and is become

[Ca+] = (1s2) (2s2) (2p6) (3s2) (3p6) (4s1)

Scandium:

Scandium have 21 electrons or it have 21 atomic number. Since an atom is a neutral species.

[Sc] = (1s2) (2s2) (2p6) (3s2) (3p6) (4s2) (3d1)

After losing two electron atom gain positive charge and is become

[Sc2+] = (1s2) (2s2) (2p6) (3s2) (3p6) (4s1)

Titanium:

Titanium have 22 electrons or it have 22 atomic number. Since an atom is a neutral species.

[Ti] = (1s2) (2s2) (2p6) (3s2) (3p6) (4s2) (3d2)

After losing three electron atom gain positive charge and is become

[Ti3+] = (1s2) (2s2) (2p6) (3s2) (3p6) (4s1)

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The reaction is endothermic and absorbed N2 and O2 are reactants while NO is a product

An endothermic reaction is a chemical reaction that absorbs heat from the surroundings, resulting in an increase in the system's internal energy.

In other words, the energy of the products is greater than the energy of the reactants, and the reaction requires an input of heat to proceed. Endothermic reactions are characterized by a decrease in temperature of the surroundings.

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Taking into account the definition of molarity, the molarity of a solution prepared by dissolving 0.2 mol sucrose in enough water to make a 100 mL solution is 2 \(\frac{moles}{liter}\).

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

\(molarity=\frac{number of moles}{volume}\)

Molarity is expressed in units \(\frac{moles}{liter}\).

In this case, you have:

Replacing in the definition of molarity:

\(molarity=\frac{0.2 mole}{0.1 L}\)

Solving:

molarity= 2 \(\frac{moles}{liter}\)

Finally, the molarity of a solution prepared by dissolving 0.2 mol sucrose in enough water to make a 100 mL solution is 2 \(\frac{moles}{liter}\).

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Answer:

4.54 * 10^-14 m

Explanation:

From Heisenberg's uncertainty principle, we can write;

Δp.Δx ≥ h/4π

Given that;

Δp =Δmv

So;

Δmv.Δx ≥h/4π

Δmv =2/100(3.5×10^7 m/s * 1.66 * 10^-27)

Δmv =1.162 * 10^-21 Kgms-1

Δx ≥6.63 * 10^-34 /4 * 3.142 * 1.162 * 10^-21

Δx ≥4.54 * 10^-14 m

Answer:

C.

Explanation:

Answer:

What mass of silver will raise the level of the water in the graduated cylinder 1.50 mL? (Ans) 28.95 g / 1.50 mL = 19.3 g/mL (The gold's density)

19.3 gm/ml³ is the density of gold  .

Density, mass of a unit volume of a material substance. Density of a substance tells how close the particles of a substance are packed.

The formula for density is D = M/V, where d is density, M is mass, and V is volume.

Density is commonly expressed in units of grams per cubic centimeter.

The SI unit of density is kilogram per cubic meter (kg/m3).

It is also represented  in the c g s unit of grams per cubic centimeter (g/cm3).

To calculate density of gold (here):

Given,

Mass of gold=28.95 gm

Volume of water=1.50 mL

Density=?

Density =Mass/Volume

Density=28.95/1.50

Density=19.3 gm/ml³

Hence, 19.3 gm/ml³ is the density of gold .

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Answer:

Option D

Explanation:

Molarity (M) of any solution is equal to the number of moles (n)of solute in it divided by total volume of solution (V)

Mathematically, it can be represented as

\(M = \frac{n}{V}\)

Substituting the given values, we get-

\(M = \frac{10}{5} = 2\)

Hence, option D is correct

Answer:

n=mass/molar mass

mass=?,molar mass=12+(35.5)4=154g/mol.n=4.63x10²

mass=4.63x10²x154=7128g

The unknown material : gold

Density is a quantity derived from the mass and volume  

Density is the ratio of mass per unit volume  

Density formula:  

\(\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}\)

ρ = density  

m = mass  

v = volume  

mass of unknown the material : 15.06 g

volume = 0.78 ml

The density :

\(\tt \rho=\dfrac{m}{V}\\\\\rho=\dfrac{15.06}{0.78}=19.31~g/ml\)

materials that match the density: gold

Answer:

\( \huge{ \boxed{0.255 \: \text{moles}}}\)

Explanation:

To find the number of moles of a solution given it's volume and concentration/molarity, we use the formula;

\( \bold{c = \frac{n}{v}} \\ \)

where

Since we're finding the number of moles, we make n the subject

\( \bold{n = c \times v}\)

From the question;

\(n = 3 \times 0.085 = 0.255\)

We have the final answer as

Explanation:

Lemonade is a sweetened lemon-flavored beverage. There are varieties of lemonade found throughout the world. In North America and South Asia, cloudy lemonade dominates. It is traditionally a homemade drink using lemon juice, water, and a sweetener such as cane sugar, simple syrup or honey.

Heavy cream, also called heavy whipping cream, is whipping cream with a milk fat content of between 36 and 40 percent. Whipping cream will double in volume when whipped.

Generally, flour does not dissolve in water as it consists of starch granules, proteins and lipids that are all insoluble in water due to their molecular structure. Instead of dissolving in water, flour will absorb water to form a sticky suspension.

An atom has single valence electron in an excited p state. The excitation of this electron left a hole in a lower d state. The possible values for the total angular momentum (I) of this atom are 1 and 2.

To determine the possible values for the total angular momentum (I) of an atom with a single valence electron in an excited p state and a hole in a lower d state, we need to consider the quantum numbers associated with angular momentum.

In this case, the total angular momentum (I) is determined by the addition of the individual angular momenta of the valence electron and the hole. The angular momentum of an electron is given by the quantum number l, which can take integer values from 0 to (n-1), where n is the principal quantum number. The total angular momentum (I) is given by the sum of the angular momenta of the electron (l) and the hole (l-1).

Therefore, the possible values for the total angular momentum (I) can be calculated by adding the range of possible values for l and (l-1) in the excited p and lower d states, respectively.

For the excited p state, the possible values of l are 1.

For the lower d state, the possible values of l are 2.

Now, we can find the possible values for the total angular momentum (I) by adding the values of l and (l-1):

When l = 1 (p state) and (l-1) = 0 (d state):  I = 1 + 0 = 1

When l = 1 (p state) and (l-1) = 1 (d state):  I = 1 + 1 = 2

Therefore, the possible values for the total angular momentum (I) of this atom are 1 and 2.

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a) We have a Fe ion with a positive charge +2, therefore we will also have a Fe ion with a +3 charge.

The charge difference is +1, this means that the Fe3+ ion gained an electron, therefore 1 must be put in front.

b) Now, in the second reaction we have 4 oxygens in the reactants and one in the products, so we put the coefficient 4 in front of H2O and thus we will have 4 oxygens in the products.

Now it would be necessary to balance the hydrogens, we have 8 hydrogens in the products and 1 in the reactants, so we put the coefficient of 8 in front of the hydrogen

Now the Mn, there is an atom of Mn in the reactants, the coefficient 1 is placed in front of the Mn+2.

So far the balanced reaction will go like this:

We need to balance the electrons. For that, we see what is the oxidation state of Mn in the molecule MnO4-. Oxygen has an oxidation state of -2.:

The oxidation state in the MnO4 molecule is +7, therefore it must gain 5 electrons to be left with a +2 charge.

And so we have the balanced equation.

The volume of the nitrogen dioxide that would be produced is  2.24 L.

Gas volume refers to the amount of space occupied by a gas. It is a measure of the physical size or extent of a gas and is typically expressed in units such as liters (L), milliliters (mL), cubic meters (m³), or cubic centimeters (cm³).

Number of moles of the lead(II)nitrate = 16.87 g/331 g/mol

= 0.05 moles

If 2 moles of  lead(II)nitrate produces 4 moles of nitrogen dioxide

0.05 moles of  lead(II)nitrate  will produce 0.05 * 4/2

= 0.1 moles of nitrogen dioxide

If 1 mole of nitrogen dioxide occupies 22.4 L

0.1 moles of nitrogen dioxide will occupy 0.1 * 22.4/1

= 2.24 L

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The statement that the amount of heat energy needed to increase the temperature of an object will vary depending on the heat capacity of the object is True.

Depending on the heat capacity of the object, a different amount of heat energy will be required to raise the temperature of the object. The amount of thermal energy needed to raise a certain amount of a substance's temperature by 100°C is known as its heat capacity.

Temperature is a sign of the presence of thermal energy, a type of energy. When an object's temperature rises, its thermal energy content does as well. The addition of thermal energy is required for an object or substance's temperature to rise.

Usually, adding energy causes a group of atoms to move more quickly and get hotter.

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Answer:

4Hg+2O2=4HgO

four Mercury + four oxygen

4202.4g is the mass in grams of 21.3 moles of BaCO\(_3\). A body's mass is an inherent quality.

A body's mass is an inherent quality. Prior to the discoveries of the atom as well as particle physics, it was widely considered to be tied to the amount of matter within a physical body.

It was discovered that, despite having the same quantity of matter in theory, different atoms and elementary particles have varied masses. There are various conceptions of mass in contemporary physics that are theoretically different but physically equivalent.

moles = mass/molar mass

mass=moles× molar mass

mass=21.3 × 197.3

       = 4202.4g

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Good Conductors ;

copper, gold, aluminum, steel

Poor Conductors ;

glass ,rubber, wood, plastic,

Steel and bronze have the lowest heat conductivity, while metals like copper and aluminum have the highest. Copper is a good material for heat exchangers because it is a good heat conductor. Examples of effective electrical and heat conductors are gold, silver, and iron.

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Average atomic mass of an element is the sum of the masses of its isotopes each multiplied by its natural abundance

\(\footnotesize \longrightarrow \: \rm Average \: atomic \: mass = \dfrac{ \sum\limits \: \% age \: of \: each \: isotope \times Atomic \: mass }{100} \\ \)

\(\footnotesize \longrightarrow \: \rm Average \: atomic \: mass = \dfrac{ 72 \times84.9 + 28 \times 87 }{100} \\ \)

\(\footnotesize \longrightarrow \: \rm Average \: atomic \: mass = \dfrac{ 6112.8 + 2436 }{100} \\ \)

\(\footnotesize \longrightarrow \: \rm Average \: atomic \: mass = \dfrac{ 8548.8 }{100} \\ \)

\(\footnotesize \longrightarrow \: \bf Average \: atomic \: mass = 85.488 \: amu \\\)

The average atomic mass will be "85.488 amu".

Given:

So,

The average atomic mass of element X will be:

= \((0.72\times 84.9)+(0.28\times 87)\)

= \(61.128+24.36\)

= \(85.488 \ amu\)

Thus the above answer is correct.

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Answer:

D

Explanation:

double replacement

the reactants decompose to form new substances by exchange of radicals

Answer:

file link http/www.openfree

The properties of the dyes you can make from different flowers are:

Flower dyes have unique colors to offer a range of options for marketing. Rose petals yield pink and red shades. They are Natural and safe. Eco-conscious consumers prefer synthetic-free products, making your dyes attractive.

In terms of Aromatic Qualities: Lavender and jasmine smell nice. Using these flowers in dyes adds subtle scents for a sensory experience. Lightfastness and durability are crucial for creating dyes that resist fading when in the sunlight.

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