Consider the measurements shown. The
most precise value is highlighted for
each measurement.
9.3478 m + 2.73 m =
What place value must the answer be
reported to?
1. ones place
2. tenths place
3. hundredths place 4. thousandths place

Answer:

True

Explanation:

because hydrogen is the first element and the atomic mass is 1 and after that the atomic number is kept increase

MgO contains metal and non metal. Binary Ionic Compounds Containing a Metal and a Nonmetal.

Electrical wires, cooking utensils, and other items are made of copper. Typically, zinc is used to coat iron to protect it. Manufacturing of electrical wires, packaging, kitchenware, and other items uses aluminium. Non-metals For example, welding torches and the manufacture of ammonia and methyl alcohol both utilise hydrogen.

Binary compounds are chemical mixtures made up of two unique components. An element is a substance that, when broken down chemically, cannot be further broken down into any simpler compounds. Magnesium oxide, calcium chloride, and sodium fluoride are all chemical elements.

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The correct answer is (A)

The statement that describes starches, fats , proteins and DNA:

They are used to store genetic information.

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Answer: 3168.92 kJ

Hope this helps!

The enthalpy of vaporization of methane is 8.22KJ and enthalpy of vaporization of ethane is 44.25KJ.

We know, the enthalpy of vaporization is defined as the amount of energy required by one mole of compound to get completely evaporated.

a. So, it is given that 0.579 moles of methane takes 4.76 KJ of energy.

So, 1 mole of methane will take 4.76KJ/0.579 energy.

Hence, the enthalpy of vaporization of methane is 8.22 KJ.

b. The amount of energy required to evaporate 22.45 grams of ethane is 21.2 KJ.

We know already,

Moles = mass of substance given/molar mass of substance.

Molar mass of ethane = 46g/mol.

So,

Moles of ethane = 22.45/46

Hence, the energy required to evaporate one mole of ethane = 21.2 ×46/22.45

Energy required = 44.25 KJ.

Hence, the enthalpy of evaporation of ethane is 44.25KJ.

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Riya is reading a book in her balcony suddenly see observes fire at her neighbors house in their kitchen she Rashid and inform the old lady who is the only one there finding the overturn kerosene can cause the fire really immediately opens the fire extinguisher and put the fire out shows we should always help neighbors.

Riya used fire extinguisher not water because water being heavier than oil settle down at the bottom and oil floats over this water and continues to burn.

The values are shown by Riya is that we should always help neighbors .

Thus, Riya is reading a book in her balcony suddenly see observes fire at her neighbors house in their kitchen she Rushes and inform the old lady who is the only one there finding the overturn kerosene can cause the fire really immediately opens the fire extinguisher and put the fire out shows we should always help neighbors.

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The limiting reagent is oxygen .

The mass of carbon dioxide produced is 2.9612g.

What is limiting agent ?

When a chemical reaction is complete, the limiting reagent—also known as the limiting reactant or limiting agent—is the reactant that has been completely consumed.

Ethane, often known as ethylene, is an unsaturated carbon molecule made up of two carbon atoms. Ethylene is burned in the presence of oxygen during the combustion reaction, producing carbon dioxide and water as byproducts.

Complete response:

Hydrocarbons are burned when they come into contact with oxygen, which causes a chemical reaction that produces carbon dioxide and water. The following is a representation of the balanced chemical equation for ethylene combustion:

C2H4+3O2→2CO2+2H2O

According to stoichiometric coefficients, one mole of ethylene produces two moles of carbon dioxide gas and two moles of water vapour for every mole of oxygen that is used.

Ethylene and oxygen therefore react at a 1:3 ratio.

The ratio of their masses to their molar masses can be used to calculate the amount of moles of ethylene and oxygen.

given mass = n

in molar mass

The number of ethylene moles is:

n(C2H4)=4.95g28gmol−1=0.177

The formula for oxygen moles is n(O2)=3.25g32gmol1=0.101

A reactant that is less prevalent and is consumed earlier in the reaction is the limiting reagent.

Although there is less oxygen available for the reaction, 0.1773=0.531g of oxygen is required to maintain a 1:3 ratio between ethylene and oxygen. So, the limiting reagent is oxygen.

The amount of limiting reagents will determine how the reaction proceeds since once they are used up, the reaction ceases.

As a result, the ratio of oxygen reacting and carbon dioxide being created is 3:2, resulting in the formation of two-thirds (23) of a mole of carbon dioxide for every mole of oxygen.

As a result, two-thirds more moles of carbon dioxide were created than were used in the reaction of oxygen:

n(CO2)=0.101×(23)=0.0673

By dividing the moles by the molar mass of carbon dioxide, it is possible to determine the mass of carbon dioxide that is created.

n(CO2)=0.0673mol×44gmol−1=2.9612g

Therefore,

(a) oxygen is the limiting reagent and

(b) 2.9612g of carbon dioxide are generated.

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During the evaporation process, liquid components separates from the solid components

Evaporation process means the change liquid water to gaseous water called evaporation and during evaporation process the soluble solid can be separated from its liquid component by allowing the liquid component to evaporate either by its own or by heating and also during evaporation the liquid component is lost to the atmosphere  and the solid remains behind

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The correct answer is option B: 7

When the following equation is balanced, the coefficients are 7.

According to the law of conversation of mass, matter is neither created nor destroyed, it only transforms form one phase to another.

First of all, write the unbalanced chemical equation.

N[tex]H_{3}[/tex](g) + [tex]O_{2}[/tex](g) → N[tex]O_{2}[/tex](g) + [tex]H_{2}[/tex]O(g)

Now, split the reaction in half and try to balance the number of atoms on each side of the chemical reaction.

After that add appropriate coefficients to balance the atoms on either side.

In the chemical equation, electron gain and lost must be equal.

At last, to balance the coefficients of all the species, multiply with a whole number or integer.

Now if we choose the following coefficients i.e. 4, 7, 4, 6 on both sides of the equation, we see the equation becomes:

4[tex]NH_{3}[/tex](g) + 7[tex]O_{2}[/tex](g) → 4N[tex]O_{2}[/tex](g) + 6[tex]H_{2}[/tex]O(g)

To verify, always check that the equation has same number of atoms on either side.

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The reactants are the one to the left side, so they are Cu and HNO₃.

Their coefficients are 3 and 8, so for each 3 Cu that reacts, we will need 8 HNO₃

The Limiting reactant is the one that we have less considering the proportions they will react.

Let's see the two possible cases.

If we have 1 mol of Cu, we need to divide it by its coefficient and multiply it by the coefficient of HNO₃:

HNO₃ --- Cu

8 --- 3

This means that we need about 2.7 mol of HNO₃ to react all the 1 mol of Cu we have.

Since we have 1 mol of HNO₃, we don't have enough.

If we make the other way around, we will get the following:

1 mol of HNO₃, so we need:

Cu --- HNO₃

3 --- 8

So, we would need 0.375 mol of Cu to react with all 1 mol of HNO₃ we have, and since we have 1 mol of Cu, this is enough.

So, we have two pos

Answer: granitic rocks

Explanation: Continental crust is composed of granitic rocks which are made up of relatively lightweight minerals such as quartz and feldspar. By contrast, oceanic crust is composed of basaltic rocks, which are much denser and heavier.

Answer:

Granites

Explanation:

Continental plates are made from different type of granites as well.

:)

The amount of heat needed to completely evaporate a 40 gram sample of propane at its boiling temperature of 230K is 14,420 joules of heat.

The heat of vaporization of a substance is the amount of heat required to change a unit mass of a liquid substance to vapor at its boiling point.

The heat of vaporization of propane is given as 356 Joules per gram.

This means that 1 gram of liquid propane requires 356 joules of heat to be converted to vapor.

Hence, the amount of heat required to convert a 40 gram sample of propane to vapor will be:

Heat required = 40 gram * 356 Joules per gram

Heat required = 14,420 joules of heat.

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The corn starch and water will stay separated and eventually sit in the glass as layers. This is due to the 2 fluids having different densities far enough from one another that the fluids do not mix.

Answer:

Cornstarch and water mixed acts both like a solid and a liquid.

Explanation:

Cornstarch and water is a suspension mixture with a solid dispersed into a liquid. When you press the mixture quickly, the starch molecules close together. This causes the water to get trapped between the starch chains and create a semi-rigid structure.

Answer: 2 significant figures

the number 78 has 2 significant figures

Significant figures are the number of digits, starting at the first non-zero digit. A zero after a non-zero number, like anything not zero, which is not a decimal, is not counted as a significant figure. So the first non zero, non decimal is 7 and the next is 8. There are no more numbers after that.

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Answer:

Joseph John Thomson

Explanation:

Joseph John Thomson is widely recognized as the discoverer of the electron.

The spin quantum number has values of +1212 or -1212.

The spin quantum number is a property of the electron itself.

The electron is a subatomic particle with an electric charge of one elementary charge less than positive. It is represented by the symbol for. Given that they have no known components or substructure and are a member of the first generation of lepton particles, electrons are typically regarded as elementary particles. Approximately 1/1836th of a proton's mass is that of an electron. An intrinsic half-integer value angular momentum (spin) with units of the decreased Planck constant, is one of the electron's quantum mechanical properties. The Pauli exclusion principle states that since electrons are fermions, they can never share the same quantum state. Electrons, like all elementary particles, have the ability to interact with other particles and behave like waves when they are diffracted, similar to how light does.

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The density of the solution is required to convert 5% by mass acetic acid to M (molarity).

10% by mass = 10 g solution/100 g acetic acid

One mole of acetic acid in five grams (60.05 grams) equals 0.033 moles of acetic acid.

Once you are aware of the solution's density, you may determine its volume and divide the number of moles of acetic acid by the volume in liters to get M (moles/liter).

Here is how to compute the molarity if all you want to do is pretend that the density is 1 g/ml even though it is actually 1.06 g/ml.

Assuming a density of 1 g/ml, 5% by mass equals 5 g/100 g, which is the same as 5 g/100 ml.

50 g/liter x 5 g/100 milliliter

0.8 M is equal to 50 g/liter times 1 mole/60 g, or 0.83 moles/liter.

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Dehydration reactions create covalent bonds which link monomer units.

In organic chemistry, monomers are single-unit compounds that join with other compounds through covalent bonds.

When multiple units of monomers join they form giant molecules called polymers.

In glucose, monomers are joined together through glycosidic linkages and join to form large complex molecules or polymers such as starch, glycogen, and cellulose.

Similarly, in biochemical reactions, a dehydration reaction occurs between glucose and fructose monomers, where a small water molecule is produced as a byproduct. Sucrose is formed as a result of a dehydration reaction.

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Ernst Rutherford determined that atoms could break apart into smaller atoms, releasing energy in the process.

In his model of an atom, he determined that an atom can be divided and an atom contains a nucleus in it which contains a positively charged particle called a proton. He discovered proton by the scattering of α particles in his gold foil experiment.

From his gold foil experiment, he concluded that atoms can be split into smaller atoms, and by doing so releases enormous energy during the process.

This was a base for formulating the nuclear fission reactions and research related to that.

Hence, Ernst Rutherford is responsible for the discovery of the nucleus and determined that atoms can be split into smaller atoms.

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Answer

a) Ba

b) Si

c) Zn

Explanation

The presence of unpaired electrons in an atom orbitals indicates paramagnetic properties. When no unpaired electron is observed in an atom orbitals, such an atom possesses diamagnetic properties.

Therefore, atoms in their ground states that are expected to be diamagnetic in the options are:

a) Ba

b) Si

c) Zn

The specific heat of water is 4.184 J/goC.

What is specific heat?

The quantity of heat needed to increase the temperature of one gram of a substance by one degree Celsius. Typically, the units of specific heat are calories or joules per gram per degree Celsius. The specific heat of water, for instance, is 1 calorie (4.186 joules) per gram per degree Celsius.

The total mass of the solution =g of KNO3 + g of water

= (2.58+ 98.57) g

= 101.15 g

Change in temperature =(20.4 – 22.5) degree celcius = -2.1 degree celcius

q = mcΔT= 101.15 g x 4.184 j/goC x -2.1oC= -8 8.74 J

Moles of KNO3= 2.58/101.11= 0.0255 mol

The heat that is being lost by the water is being gained by KNO3 so it is + heat of solution per mole(J)= 888.74 J/0 .0255 mol= 34829.82257 J/mol= + 35 K J/mol

Hence, the heat of solution per mole is kno3 is 35KJ/mol

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This model shows longitudinal waves.

A longitudinal wave is a form of a wave that travels within the direction of the medium, however, a transverse wave is every other sort of wave that travels within the path of the medium. Longitudinal waves are made of compressions and rarefactions, at the same time as transverse waves are the product of crests and troughs.

In a longitudinal wave, the debris is displaced parallel to the course the wave travels. An instance of longitudinal waves is compressions transferring along a slinky. we can make a horizontal longitudinal wave with the aid of pushing and pulling the slinky horizontally.

Longitudinal waves are mechanical waves that require a medium for propagation, transverse waves are non-mechanical waves that do not require a medium for propagation. Longitudinal waves include compressions and rarefactions, whilst transverse waves include crests and troughs.

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The density of the marble in g/mL is 1.084g/mL. As the density of Marble is 1084kg/m3 that is greater than that of water 1,000 kg/m3, hence it will sink.

Describe density.

Density, or mass per unit volume, is defined as the ratio of mass to volume.

Density is the mass of a material substance per unit Density. Density is defined by the formula Density = M / V, where d stands for Density, M for mass, and V for volume.

It gauges how much "stuff" an object contains in relation to its volume (cubic metre or cubic centimeter). In essence, Density is a measurement of how closely together matter is packed.

Grams per cubic centimetre are a typical unit of measurement for density. For instance, while Earth has a density of 5.51 grammes per cubic centimetre, water has a density of 1 grammes per cubic centimetre.

Water Density = 1,000 kg/m3

Marble density=  0.230kg / 0.212L

                                = 1.084g/mL

                               =1084kg/m3

As the density of Marble is 1084kg/m3 that is greater than that of water 1,000 kg/m3, hence it will sink.

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Option A and B both are correct answer

What is the Vernier?

Vernier, a Frenchman, invented the vernier calliper in 1631 as a tool for taking extremely precise linear measurements. It employs two graduated scales: the vernier, a specifically graduated auxiliary scale that slides parallel to the main scale and allows readings to be made down to a fraction of a division on the main scale, and a main scale that is comparable to that on a ruler.

Vernier Sizing

The vernier scale takes precise measurements. It contains two scales: a regular, huge scale (the main scale) and a smaller scale inside that is used to accurately compute measurements.

Due to the vernier acuity idea upon which it is built, the vernier scale provides accurate measurement. The misalignment of two line segments is measured by the vernier acuity, a form of visual acuity. Aligned and misaligned lines are easily distinguishable by the human eye.

Vernier Calipers have the following three main applications:

It is employed to gauge a tube's or cylinder's inside diameter.

It is helpful for determining an object's length.

The diameter of circular objects is often measured using a vernier calliper.

Vernier callipers are beneficial for a variety of tasks in addition to these, such as in the industrial sector and for professionals and engineers.

It is used to make wavelength measurements.

it is used to measure the mass of the experimental substance

Therefore both option A and B are correct answer

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The ozone in the air will make rock brittle and crack is not considered to contribute to weathering.

Weathering is a process that breaks down or disintegrates the rocks which are present on the surface of our planet. The air we breathe can affect weathering in several ways.

Wind will act as an abrasive agent wearing down rock. The wind when it comes in contact with rocks would carry small particles from the rock along with it. In long run, the rock would disintegrate.

Oxygen in the air will act as a chemical agent and oxidize iron in rocks thereby wearing them down. The rocks with iron in it would react with oxygen in the air and would turn to rust. The process is called oxidation. Rust in rock would weaken them and wear it down.

The ozone in the air would not make rock brittle and crack. It makes rubber brittle by breaking the bonds in rubber polymer.

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According to Charles' law, with consistent pressure, the volume of an excellent gas gains in direct ratio to the absolute temperature.

At 35°C, the weather balloon holds 20.67 L of helium.

[tex]\frac {V_{1}}{T_{1}}[/tex]=[tex]\frac {V_{2}}{T_{2}}[/tex]

[tex]V_{1} = first volumeV_{2} = second volumeT_{1} = first temperatureT_{2} = second temperature[/tex]

[tex]V_{2} =\frac{ V_{1} X T_{2}}{T_{1}}[/tex] temperature are in  kelvin. Here's the formula to convert Kelvin to Celsius: ° C = K − 273.15

[tex]V_{2}[/tex] = 20.67 L

The volume of helium in the weather balloon at 35C is  20.67 L.

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[tex]Mg + 2HCl[/tex] -> [tex]MgCl_{2} + H_{2}[/tex]

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