helpppppp plssssssss does anyone know this ? what type of structure is shown in the diagram?

The correct option is option A. when the students check the air pressure of bicycle tires, once by keeping it out in the winter and noticing the air pressure being decreased and after by keeping the bicycle inside at room temperature and noticing that the air pressure has increased.

According to Gay lussac's law, the temperature and pressure of a gas are directly proportional to each other, provided the volume is constant.

When the temperature of a gas is increased, the molecules gain more kinetic energy and hence the frequency of them hitting the walls of the container increases which basically implies that the pressure increases.

On the other hand when the temperature is low, the molecules do not have substantial kinetic energy to hit the walls of the container frequently, that is the pressure decreases.

When the bicycle tires were kept out in the winter, the low temperature decreased the air pressure inside the tires. While when they were warmed at room temperature, the pressure inside the tires increased.

Therefore, the correct option is option A.  when the students check the air pressure of bicycle tires, once by keeping it out in the winter and noticing the air pressure being decreased and after by keeping the bicycle inside at room temperature and noticing that the air pressure has increased.

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Answer: The initial temperature was 588 Kelvin

Explanation:

The combined gas equation is,

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

where,

[tex]P_1[/tex] = initial pressure of gas = 1.49 atm

[tex]P_2[/tex] = final pressure of gas = 657 torr = 0.864 atm   (760 torr = 1atm)

[tex]V_1[/tex] = initial volume of gas = 6400 ml

[tex]V_2[/tex] = final volume of gas = 9660 ml

[tex]T_1[/tex] = initial temperature of gas = ?

[tex]T_2[/tex] = final temperature of gas = [tex]245^0C=(245+273)K=515K[/tex]

Now put all the given values in the above equation, we get:

[tex]\frac{1.49\times 6400}{T_1}=\frac{0.864\times 9660}{515}[/tex]

[tex]T_1=588K[/tex]

The initial temperature was 588 Kelvin

Answer:

time

Explanation:

time can be controlled and set while all the others can't be necessarily controlled

Answer:

0.01.

Explanation:

This is because, if you divided one rectangle by ten, it will give 0.1

That is 1/10 = 0.1

If each of the smaller rectangles is divided by 10.

It will be 0.1/10 which will be equal to 0.01.

The rectangles will be 0.01 each.

Answer:

Other times I place a candle in water and cover it with a glass jar  .

Explanation:

only to ... Many of you may already know this as the Whoosh Bottle demo due ... I have used this demo in the past for topics like exothermic reactions, combustion reactions, ... This adds to the evidence of a partial vacuum created in the bottle

Answer:

Fossils

Explanation:

Ancient plants and animal formed into rocks called fossils.

A fossil can be defined as the mineral impression or remains of living organisms such as plants and animals that are prehistoric in nature.

A geologic column can be defined as a collection of rock layers that are typically grouped based on their relative ages in a descending order i.e from oldest to the youngest.

Generally, the layers of the rock that are found in various parts of the world are known to be different because they all comprises of distinct Earth's geological history (fossils).

Answer:

Explanation:

ℎ ℎ

Answer:

704.6 g CO2

Explanation:

MM sucrose = 342.3 g/mol

MM CO2 = 44.01 g/mol

g CO2 = 456.7 g sucrose x (1 mol sucrose/MM sucrose) x (12 moles CO2/1 mol sucrose) x (MM CO2/1mol CO2) = 704.6 g CO2

Answer:

Na+ lost one electron:    1s2 2s2 2p6

Cl- gained an electron:   1s2 2s2 2p6 3s2 3p6

Explanation:

it shoudl be : 2Fe(NO3)3 + 3MgSO4 → 3Mg(NO3)2 + Fe2(SO4)3

(the difference is Fe2(SO4)3 has no coefficient)

Answer:

true

downstream to the riverbed. However, the most common mechanism to produce older rocks on top of younger is by thrust faulting. Thrust faults form where rocks are being compressed, usually by plate tectonic mechanisms. Thrust faults rip up older strata and pile it on top of younger rocks.

Explanation:

D

all of above becuase it's all conservation

Answer:

The answer is c which is pollution is likely to decrease water supply in the future

Answer:

Na2B4O7 + H2SO4 + 5H2O → 4H3BO3 + Na2SO4  

Explanation:

The unbalanced equation is given as;

Na2B4O7 + H2SO4(aq) + H2O → H3BO3(s) + Na2SO4(aq)

Balancing the equation of the reaction involves making sure the number of moles of elements in the reactants to be equal to the number of moles of the element of the products.

The balanced equation is given as;

Na2B4O7 + H2SO4 + 5H2O → 4H3BO3 + Na2SO4  

Answer:

Explanation:

dfghyuiop[]5565677dam u baddie no comparing

Answer:

[tex]\boxed {\boxed {\sf 2.62 \ mol \ N_2}}[/tex]

Explanation:

The relationship between moles and gases is unique. Regardless of the type of gas, there will always be 22.4 liters of gas in 1 mole, as long as it's at STP (standard temperature and pressure).

We can make a ratio using this information.

[tex]\frac {22.4 \ L \ N_2}{ 1 \ mol \ N_2}[/tex]

Multiply by the given number of moles.

[tex]58.6 \ L \ N_2 *\frac {22.4 \ L \ N_2}{ 1 \ mol \ N_2}[/tex]

Flip the fraction so the liters of nitrogen cancel.

[tex]58.6 \ L \ N_2 *\frac {1 \ mol \ N_2}{ 22.4 \ L \ N_2}[/tex]

[tex]58.6 *\frac {1 \ mol \ N_2}{ 22.4 }[/tex]

[tex]\frac {58.6 \ mol \ N_2}{ 22.4 }= 2.61607143 \ mol \ N_2[/tex]

The original measurement of liters has 3 significant figures, so our answer must have the same.

For the number of moles calculated, 3 sig figs is the hundredth place. The 6 in the thousandth place tells us to round the 1 to a 2.

[tex]2.62 \ mol \ N_2[/tex]

58.6 liters of N₂ gas at STP is equal to about 2.62 moles.

Answer: 0.99 grams of chlorine gas is produced by the reaction of 3.3g of ammonium perchlorate

Explanation:

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]  

[tex]\text{Number of moles of } NH_4ClO_4=\frac{3.3g}{117.5g/mol}=0.028moles[/tex]

The decomposition of ammonium perchlorate is :

[tex]2NH_4ClO_4\rightarrow Cl_2+N_2+2O_2+4H_2O[/tex]

According to stoichiometry :

2 moles of [tex]NH_4ClO_4[/tex] produce =  1 mole of [tex]Cl_2[/tex]

Thus 0.028 moles of [tex]NH_4ClO_4[/tex] produce=[tex]\frac{1}{2}\times 0.028=0.014moles[/tex]  of [tex]Cl_2[/tex]  

Mass of [tex]Cl_2=moles\times {\text {Molar mass}}=0.014moles\times 71g/mol=0.99g[/tex]

Thus 0.99 grams of chlorine gas is produced by the reaction of 3.3g of ammonium perchlorate

Answer: all of them?

Explanation:

Answer:

Deku.

Explanation:

Answer:

[tex]\Delta H_{rxn}=-0.111 \frac{kJ}{mol}[/tex]

Explanation:

Hello!

In this case, since the total heat flow due to the reaction equals the negative of the calorimeter's heat, we can first compute the former as shown below:

[tex]Q_{rxn}=-C\Delta T\\\\Q_{rxn}=6.38\frac{J}{\°C}*3.2\°C=-20.416J[/tex]

Now, since this total heat flow due to the reaction is defined in terms of the heat of reaction and the total reacted moles:

[tex]Q_{rxn}=n*\Delta H_{rxn}[/tex]

Thus, we compute the moles in 8.5 g of ethanol:

[tex]n=8.5g*\frac{1mol}{46.08g}=0.185mol[/tex]

Therefore, the heat of reaction results:

[tex]\Delta H_{rxn}=\frac{Q_{rxn}}{n} =\frac{-20.416J}{0.185mol} =-110.7J/mol\\\\\Delta H_{rxn}=-0.111 \frac{kJ}{mol}[/tex]

Best regards!

Answer:

183g

Explanation:

mass can't be created or destroyed so i think you just add up the total amounts of matter

Answer:

2

Explanation:

in terms of cells, it exists from previous existing cells, that means scientist are built up by the work of other scientist

Answer:

the answer is B

Explanation:

Answer:

The answer is Magnesium

Answer:

the pressure is equal to 0.2atm

The pressure at which the volume of the gas is 2 L at the same temperature as when the volume of a gas is 400 mL and pressure 1 atm is 0.2 atm.

According to combined gas law,

[tex]\rm \dfrac{PV}{nT} = R[/tex]

In the Combined Gas Law,if we change either one of the variables the others will also change.

When the moles of the gas is constant , the above equation can be written as ,

[tex]\rm \dfrac{P'V'}{T'} = \dfrac{PV}{T}[/tex]

Given is P = 1 atm , V= 400ml , V'= 2L= 2000ml , P'= ? T=T'

So we will substitute the values in the above formula keeping temperature constant.

[tex]\rm P'V' = PV\\\\\rm P' \times 2000 = 1 \times 400\\ \\\m P'= \dfrac{1\times 400}{2000} = 0.2 \; atm\\\\\rm P' = 0.2 \; atm\\[/tex]

Therefore the pressure at which the volume of the gas is 2 L at the same temperature as when the volume of a gas is 400 mL and pressure is 1 atm is 0.2 atm.

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Answer:

[tex]5850\ \text{cal}[/tex]

Explanation:

m = Mass of water = 4500 g

c = Specific heat of water = [tex]1\ \text{cal/g}^{\circ}\text{C}[/tex]

[tex]\Delta T[/tex] = Change in temperature of water = [tex]1.3^{\circ}\text{C}[/tex]

Heat is given by

[tex]q=mc\Delta T\\\Rightarrow q=4500\times 1\times 1.3\\\Rightarrow q=5850\ \text{cal}[/tex]

A slice of the bread contains [tex]5850\ \text{cal}[/tex].

Answer:

NH3 and HCl

Explanation:

NH3 and HCl are acids because of their hydrogen ions. NHO3 and NaOH are bases (you can tell because they have an OH). I don't believe SCl2 is an acid or a base

Answer:

im sorry i dont

Explanation: