3. The graph below shows the temperature changes occurring in two hot packs that are made from different materials. The same amounts of water and CaCl2 were used to make each pack. Which of the following inferences is supported by the graph?

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Answer:

Matter

Explanation:

In classical physics and general chemistry, matter is any substance that has mass and takes up space by having volume.

Answer:

When magnesium burns in air, the oxygen in the air reacts with magnesium metal to produce magnesium oxide.

Magnesium burns in oxygen present in the air to produce magnesium.

Answer:

hhh

Explanation:

Answer:

Initially the function is symmetric with respect to the axis of the one dimensional box. In the final state it is also symmetrical, however you can envision a snapshot of the system as the light field is interacting with the wave-function wherein a node begins to develop as is shown in the middle and the wave function is evolving from the initial to final state. Now consider that the electron density during process is the square of the wave function:

Electron density during transition

As can be seen in the initial and final states the electron density is symmetrically distributed with respect to the axis of the box. However with the field on, the electron density is not symmetrically distributed and a transitory dipole moment can be present. To relate back to real molecules think of each of those orbitals as a linear combination of atomic orbitals. One important factor is the symmetry. But there may be one other factor that will be just as important as symmetry. If you treat orbital 1 as a linear combination over n orbitals and orbital 2 as a linear combinations of orbitals as well, there will be a spatial over lap between the orbital in the ground state and the orbital in the excited state. If there is no spatial overlap between the ground state and excited state orbitals there will be no transition dipole moment. However, if the electrons are in the same place spatially, a large transition dipole moment will result.

Explanation:

Solution :

According to the Graham's law of diffusion, we know that, the rate of the diffusion varies inversely to the molar mass of the gas, i.e.

Rate of diffusion, [tex]$r_d = \frac{a}{\sqrt M}$[/tex]

where, the 'M' is the molar mass of the gas.

Now in the case of the isotopes of the Krypton,

Atomic mass of [tex]$^{80}Kr$[/tex] = 80 AMU

Atomic mass of [tex]$^{82}Kr$[/tex] = 82 AMU

Atomic mass of [tex]$^{83}Kr$[/tex] = 83 AMU

So the ratio of the rate of diffusion of the three isotopes are :

[tex]$M_{d,^{80}Kr}:M_{d,^{82}Kr}:M_{d,^{83}Kr}$[/tex]

[tex]$=\frac{1}{\sqrt{80}}:\frac{1}{\sqrt{82}}:\frac{1}{\sqrt{83}}$[/tex]

[tex]$=0.1118:0.1104:0.10976$[/tex]

Dividing the above three with the smallest number among the three i.e. 0.10976, we get the relative rates of diffusion.

∴ [tex]$M_{d,^{80}Kr}:M_{d,^{82}Kr}:M_{d,^{83}Kr}$[/tex]

 = 1.02 : 1.01 : 1

Hence the relative rate of diffusion are :

[tex]$^{80}Kr(1.02)>^{82}Kr(1.01)>^{83}Kr(1.00)$[/tex]

Answer:

See attached image.

Explanation:

Hello there!

In this case, according to the isomeric structure of hydrocarbons, it is possible to draw a five-carbon hydrocarbon with a tertiary carbon by keeping in mind these tertiary carbons are characterized by the presence of three bonds with carbon atoms.

In such a way, as shown on the attached image, the second carbon from left to right is tertiary because of the aforementioned, and also, the compound has five carbon atoms and twelve hydrogen atoms.

Best regards!

Answer: i) [tex]Mg+2HCl\rightarrow MgCl_2+H_2[/tex]

ii) [tex]Mg(OH)_2+2HCl\rightarrow MgCl_2+2H_2O[/tex]

iii)  [tex]3AgNO_3+K_3PO_4\rightarrow Ag_3PO_4+3KNO_3[/tex]

iv)  [tex]2H_2SO_4+Pb(OH)_4\rightarrow Pb(SO_4)_2+4H_2O[/tex]

v) [tex]3Ca(OH)_2+2H_3PO_4\rightarrow Ca_3(PO_4)_2+6H_2O[/tex]

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced chemical reactions will be:

i) [tex]Mg+2HCl\rightarrow MgCl_2+H_2[/tex]

ii) [tex]Mg(OH)_2+2HCl\rightarrow MgCl_2+2H_2O[/tex]

iii)  [tex]3AgNO_3+K_3PO_4\rightarrow Ag_3PO_4+3KNO_3[/tex]

iv)  [tex]2H_2SO_4+Pb(OH)_4\rightarrow Pb(SO_4)_2+4H_2O[/tex]

v) [tex]3Ca(OH)_2+2H_3PO_4\rightarrow Ca_3(PO_4)_2+6H_2O[/tex]

Answer:

the volume in mL is 15

Explanation:

The computation of the volume in mL is shown below:

As we know that

N = nM

where

N denotes the normality

n denotes the number of equivalents

M denotes the molarity

Also

For NaOH , N = M

Now

M× V_1 = N × V_2

V_1 = N × V_2 ÷ M

= 0.09000 N × 1.0 L ÷ 6.0 M

= 15 mL

hence, the volume in mL is 15

Answer:

C. Precipitation

It made me put more on my answer.

Answer:

The answer is "11.07 g".

Explanation:

Isoamyl alcohol is a reagent restriction

Isoamyl alcohol Moles: 

[tex]= \frac{7.5}{88.15} \\\\ =0.085[/tex]

Moles only with the shape of isoamyl acetate are equivalent to numbers.

Isoamyl acetate grams:

[tex]= 0.085 \times 130.19\\\\ = 11.07 \ g[/tex]

Answer:

Endothermic.

Explanation:

Hello there!

In this case, it is necessary to keep in mind that exothermic processes are characterized by the release of energy and the endothermic processes by the absorption of heat. In such a way, every process from solid to liquid or gas is endothermic as they require energy to separate the molecules and therefore turn out in the phase change. On the other hand, every process from gas to liquid or solid is exothermic as heat is released to rejoin the molecules and produce the phase change.

Therefore, since solid water molecules tend to be well-arranged, it is necessary to add heat to the system to produce the phase change until gas; in such a way, this process is endothermic as energy must be absorbed by the ice.

Best regards!

Answer:

the carbon atoms in the double bond cannot rotate

Explanation:

Isomers refer to molecules that have a distinct arrangement of the atoms in the molecule but have the same molecular formula.

Alkenes refer to a series of unsaturated hydrocarbons that contain ethylene and propylene.

Some alkenes have geometric (cis-trans) isomers because the carbon atoms in the double bond cannot rotate.

Answer:

There is no molecule or ion as ClO3. The correct formula of chlorate ion is ClO3-.

The empirical formula for dioxin (C₁₂H₄Cl₄O₂) is (C₆H₂Cl₂O).

We can determine the components of a chemical compound by looking at its formula. We can determine the precise number of atoms in a compound's molecule using its molecular formula. The ratio of these components is provided by the empirical formula. It is the compound's molecular formula scaled down to its lowest integer ratio.

Empirical formula for dioxin (C₁₂H₄Cl₄O₂) is (C₆H₂Cl₂O).

To determine the emperical formula:

Step1: Determine the masses.

Step 2: Multiply the grams by the atomic mass to get the number of moles.

Step 3: Subtract the least number of moles from the total number of moles of each element.

Learn more about the Emperical formula with the help of the given link:

https://brainly.com/question/21743699

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Answer:

A. Find a connection between variables

Explanation:

In the scientific method, the first step is to make an observation. To observe means to carefully monitor phenomena with a view to draw general patterns from specific occurrences.

The second step is to draw up a hypothesis; this is a tentative explanation for the observation.

The next step is to perform an experiment to determine the effect of change in one more variables on another variable. The experiment will confirm or disprove the hypothesis.

The last step is to draw a conclusion. In drawing up a conclusion, a scientist finally establishes the relationship between two variables and finds the connection between them.

Answer:

[tex]\boxed {\boxed {\sf A.\ 1.76 \ mol \ NaNO_3}}[/tex]

Explanation:

To covert from grams to moles, the molar mass is used. This is the mass of 1 mole of a substance. These are located on the Periodic Table. They are the equivalent to the atomic masses, but have different units: grams per mole.

We are given the compound: NaNO₃

Look up the values for each individual element (sodium, nitrogen, and oxygen)

Now find the molar mass of the entire compound. Notice that oxygen has a subscript of 3 in the formula, so there are 3 atoms of oxygen per molecule. We must multiply its molar mass by 3 before adding the others.

Use this value as a ratio.

[tex]\frac {84.993769 \ g \ NaNO_3}{1 \ mol \ NaNO_3}[/tex]

Multiply by the given number of grams: 150

[tex]150 \ g \ NaNO_3*\frac {84.993769 \ g \ NaNO_3}{1 \ mol \ NaNO_3}[/tex]

Flip the ratio so the grams of sodium nitrate cancel.

[tex]150 \ g \ NaNO_3*\frac {1 \ mol \ NaNO_3}{84.993769 \ g \ NaNO_3}[/tex]

[tex]150 *\frac {1 \ mol \ NaNO_3}{84.993769}[/tex]

[tex]\frac {150}{84.993769} \ \ mol \ NaNO_3[/tex]

[tex]1.7648352551 \ mol \ NaNO_3[/tex]

If we round to the nearest hundredth, the 4 in the thousandth place tells us to leave the 6.

[tex]1.76 \ mol \ NaNO_3[/tex]

150 grams of sodium nitrate is approximately 1.76 moles of sodium nitrate. Therefore, choice A is correct.

Answer:

It is A

Explanation:

Abiotic matter

Answer:

Explanation:

The answer is true

Answer:I think the answer is true

Explanation:

Areas where the air is warmed often have lower pressure because the warm air rises. These areas are called low pressure systems. Places where the air pressure is high, are called high pressure systems. A low pressure system has lower pressure at its center than the areas around it.

Answer:  200mL

Explanation:

Answer:

Explanation:

A: 0.8 KM/Min

1.6 x 30 = 48

48/60 = 0.8

Answer: I believe that B) require target cell receptors to illicit a target cell response, is the right answer.

Explanation:

Answer:The electron-domain geometry around this central atom is  linear

Explanation:

The hybridization is sp which means the number of electron pairs involved are 2. The electron domain geometry will have two sigma bonds and thus geometry will be linear.

The electron domain geometry will be Trigonal bipyramidal when hybridization is [tex]sp^3d[/tex]

The electron domain geometry will be octahedral when hybridization is [tex]sp^3d^2[/tex]

The electron domain geometry will be Trigonal planar when hybridization is [tex]sp^2[/tex]

The electron domain geometry will be tetrahedral when hybridization is [tex]sp^3[/tex]

Answer:

Many countries are undergoing an increase in technology and standard of living.

Explanation:

The statement describes a reason scientists predict that carbon dioxide emissions will increase over the next few decades is many countries are undergoing an increase in technology and standard of living. Therefore, option D is correct.

The main contributor to the rising carbon dioxide concentrations in the atmosphere is human activity, specifically the burning of fossil fuels like coal, oil, and gas, as well as deforestation.

Coal and oil emissions are expected to be higher than they were in 2021, with oil accounting for the majority of the increase in overall emissions.

The delayed recovery of international aviation following COVID-19 pandemic limitations accounts for a major portion of the increase in emissions from burning oil.

Greenhouse gases have far-ranging environmental and health effects. They make climate change by trapping heat, and they also impart to respiratory disease from smog and air pollution.

Thus, option D is correct.

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Answer: 1. I

2. Na

3. F

Explanation:

Ionization energy is the energy required to remove the most loosely bound electron from an isolated gaseous atom.

In a group, the ionization energy decreases as we move down a group as the size increases. The electrons get added to the next shell. Thus the valence electron moves far from the nucleus and thus less energy is required to remove the valence electron.

1. Cl and I: Cl will have larger ionization energy as I lies lower in the group.

2. Na and K : Na will have larger ionization energy as K lies lower in the group

3. F and Br : F will have larger ionization energy as Br lies lower in the group.

Explanation:

molar mass of the compound = 24 + 2× 14+ 16×6

= 24 + 28 + 96

= 148g/mol

no of moles = given mass / molar mass of the compound

1.4 = given mass/ 148

1.4×148=given mass

207.2 g

Answer:

d

Explanation:

a mutation is the variation of a norm, a mutation can alter any organism in any way

Answer:

Gas molecules move at different speed at a given temputure bc as temp increases they move faster

Explanation:

they move faster bc they gain kinetetic energy