what is the effect of 1 mol dm-3 hydrochloric acid on a bulb? Explain why this effect happens.

Answer: HBr has the lowest rate of effusion at a given temperature.

Explanation: The effusion rate usually increases with increase in temperature because the kinetic energy of the gaseous molecules increases. But it was not true for gases having heavier mass. This was explained by Graham's Law.

Graham's Law states that the rate of effusion of a gas is inversely proportional to the square root of its molecular weight.

[tex](\text{Rate of effusion})_A\propto \frac{1}{\sqrt{\text{Mol. mass}_A}}[/tex]

We are given different gases with different Molecular masses. The gas having larger Molecular mass will have the lowest rate of effusion.

Mol. Mass of [tex]SO_3[/tex] = 80 g/mol

Mol. Mass of [tex]CH_4[/tex] = 16 g/mol

Mol. Mass of [tex]NH_3[/tex] = 17 g/mol

Mol. Mass of HBr = 81 g/mol

Mol. Mass of HCl = 36 g/mol

As, Mol. mass of HBr is the highest, so its rate of effusion will be the lowest.

304 kg*ms or in ms 84.48 kgm/s

Metals in the Periodic Table are grouped together due to their similar properties, mainly driven by their outer electron configurations. This includes the representative, transition, and inner transition metals, each of which have unique electron filling patterns.

Metals are grouped together in the Periodic Table because of the similarity in their properties. This is a result of their similar outer electron configurations. The grouping of metals includes the representative metals, transition metals, and inner transition metals, which are classified based on the filling orbital.

Representative metals are elements in which the s and p orbitals are filling. These metals are found in groups 1, 2, 3, 12, 13, 14, and 15 of the Periodic Table. Examples of these metals include the alkali metals (group 1) and the alkaline earth metals (group 2). The elements in these groups share common properties, such as their reactivity with water and air.

Transition metals and inner transition metals are elements which have d and f orbitals filling, respectively. These metals exhibit high thermal and electrical conductivity among other physical and chemical properties.

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The answer would be C

You have elements, compounds, and mixtures.

Salt water is a mixture.

Page:1

12. I think the answer would be True ( not that sure )

13. It would die because it would not be able to perform Photosynthesis ( wouldn't be able to make its own food) without any Water, or sunlight.

Page:2

1: C

2: A

3: B

Page: 3

4. Mold, Grass, and Tree.

5. Grasshopper, frog, Snake, monkey, caterpillar, and a fish.

Page: 4

6. Mushroom, Bacteria

Balanced chemical reaction:

2FeBr₃(aq) + 3Na₂S(aq) → Fe₂S₃(s) + 6NaBr(aq).

Ionic reaction:

2Fe³⁺(aq) + 3Br⁻(aq) + 6Na⁺(aq) + 3S²⁻(aq) → Fe₂S₃(s) + 6Na⁺(aq) + 6Br⁻(aq).

Net ionic reaction: 2Fe³⁺(aq) + 3S²⁻(aq) → Fe₂S₃(s).

FeBr₃ - iron(III) bromide.

Na₂S - sodium sulfide.

Fe₂S₃ - iron(III) sulfide.

NaBr - sodium bromide.

Answer:

Net ionic equation is [tex]2Fe^{3+}(aq.)+3S^{2-}(aq.)\rightarrow Fe_{2}S_{3}(s)[/tex]

Explanation:

First write total ionic equation and then remove spectator ions from both side of equation to get net ionic equation. To write total ionic equation, separate all aqueous species into their constituting ions.

Total ionic equation-

[tex]6Na^{+}(aq.)+3S^{2-}(aq.)+2Fe^{3+}(aq.)+6Br^{-}(aq.)\rightarrow Fe_{2}S_{3}(s)+6Na^{+}(aq.)+6Br^{-}(aq.)[/tex]

Here [tex]Na^{+}and Br^{-}[/tex] are spectator ions as they are presnt on both side of equation.

Hence net ionic equation is [tex]2Fe^{3+}(aq.)+3S^{2-}(aq.)\rightarrow Fe_{2}S_{3}(s)[/tex]

The total amount that Staci had in hand is $200.00.

The ticket at that time costs $87.96.

One Tshirt costs, $30.00.

Now that she has paid ticket, she will deduct the ticket from the cash she has in hand, so as to know the amount she is remaining with.

Tha is, $200-$87.96 = $112.04.

∴ In hand Staci has $112.04 extra cash whereby she can purchase more t shirts.

To get the number of tshirt she can buy, she will divide the amount she has in hand by the amount per piece of t shirt.

For example, $112.04 / $30 = $3.73.

∴ Staci can only purchase threet shirts only at a total cost of $90 for all the t shirts which is $30 × 3 = $90.

Staci has excess of 22.04 after deducting ticket and the other amount she has used to purchase the extra t shirts.

That is, $112.04 - $90 = $22.04.

She can buy Three shirts.

Total money of staci = $200.00

The ticket's cost     = $87.96

Price of one shirt     =  $30.00

Shirts bought by staci = ?

Solution:

Money left after ticket purchase = $200 - $87.96

                                                      =  $112.04

         No. of shirts she can buy   =  $112.04/$30 = 3.73

                                                      =  Three shirts she can buy.

The volume of a gas that is required  yo react with 4.03 g mg  at STP  is 1856 ml

calculation/

     moles=mass/molar mass

moles of Mg is therefore=4.03 g/  24.3 g/mol=0.1658  moles

  the moles 02=0.1679 x1/20.0829 moles

                            0.0895 moles=? L

into Ml = 1.8570 x1000=1856  ml  approximately to 1860

The volume of oxygen gas required to react with 4.03 g of Mg at STP is approximately 1860 mL, calculated by first determining the moles of Mg, then the stoichiometric ratio with oxygen, and applying the gas volume at STP.

To find out what volume of oxygen gas is required to react with 4.03 g of Mg at STP, we first need to calculate the number of moles of magnesium. The molar mass of Mg is 24.305 g/mol. Therefore, the moles of Mg in 4.03 g can be calculated by the formula:

moles of Mg = mass of Mg / molar mass of Mg

moles of Mg = 4.03 g / 24.305 g/mol = 0.1658 moles Mg.

According to the balanced chemical equation 2Mg(s) + O₂(g) → 2MgO(s), 2 moles of Mg reacts with 1 mole of O₂, hence, 0.1658 moles of Mg will react with half that amount of O₂, which is 0.0829 moles of O₂.

At STP (Standard Temperature and Pressure), 1 mole of any gas occupies 22.4 liters or 22,400 milliliters. Therefore, the volume of O₂ gas required is:

volume of O₂ = moles of O₂ * volume occupied by 1 mole of gas at STP

volume of O₂ = 0.0829 moles * 22,400 mL/mol = 1856.96 mL, which can be rounded to 1860 mL (Choice A).

Annual precipitation is the amount of rain that falls in a specific geographic area over one year. It affects ecosystems, agriculture, and human activities. Extraordinary rainfall in the past has led to poor harvests and population loss.

Annual precipitation refers to the amount of rain that falls in a specific geographic area over the course of one year. It is a key component of the climate of a region and plays a significant role in shaping ecosystems, agriculture, and human activities.

For example, in 1314, Europe and Asia experienced a period of abnormally cold and wet winters due to extraordinary rainfall. This led to poor harvests and population loss. Similarly, in North America, established agricultural systems faltered under hotter summers and colder winters, resulting in severe population loss in the southwestern region.

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All are true except the statement that ions are formed by changing the number protons in an atom’s nucleus.

A neutral atom contains the same number of protons (positive charge) and electrons (negative charge).

If there are more electrons than protons, the atom becomes a negative ion.

If there are fewer electrons than protons, the atom becomes a positive ion.

The protons are in the nucleus, where we can’t easily get at them. The electrons are outside the nucleus, so other chemicals can easily get at them and either remove them or add to their number.

Metals have only a few valence electrons, so it is fairly easy to remove them and form positive ions.

the answer is 39.58 lbs

You’re welcome

The total shipping weight for the bicycle and its box is the sum of the individual weights, which is 40.3 pounds.

The question asks for the total shipping weight of a bicycle and its box. The weight of the bicycle is given as 32.5 pounds and the weight of the box is 7.8 pounds. To find the total shipping weight, we simply add these two weights together:

Bicycle weight: 32.5 pounds

Box weight: 7.8 pounds

Total shipping weight = Bicycle weight + Box weight

Total shipping weight = 32.5 pounds + 7.8 pounds

Total shipping weight = 40.3 pounds

This is the combined weight of the bicycle and its box that would be used to determine shipping costs.

A stretched rubber band has potential energy.

Potential energy is the energy of position.

You put work energy into the band when you stretched it.

Now, the band has the potential to do work when you let go and allow it to return to its unstretched state.

Answer:- 240029 cans.

Solution:- As per the given information, 32537 cans were collected in September and 207492 cans were collected in October. It asks how many Cans were collected in October and September.

It is an addition problem so let's add the two given numbers of cans:

Total cans = 32537+207492 = 240029

So, 240029 cans were collected in October and September.

Liberty Elementary School collected a total of 240,029 cans in September and October, by adding 32,537 cans collected in September to 207,492 cans collected in October.

The question asks to find the sum of cans collected in September and October by Liberty Elementary School. In September, they collected 32,537 cans and in October they collected 207,492 cans.

To find the total number of cans collected over the two months, we add the number of cans collected in September to the number of cans collected in October:

32,537 (September) + 207,492 (October) = 240,029

Hence, the total number of cans collected in September and October is 240,029.

The answer depends on what substances you were testing, but here are some ideas.

If all of them were white as in the typical experiment, then color is not very useful.  If you were allowed to taste them, then a salty taste would be a helpful clue.  If the textures were different, some crystals, like salt or sugar and others powdery, like flour or cornstarch, those properties would be helpful.  If some dissolved in water,...

Both physical and chemical properties can be used to identify a mystery powder. Physical properties include characteristics like color, texture, mass, and volume, while chemical properties entail reactions with other substances or heat.

In order to identify a mystery powder, both physical and chemical properties can be highly useful. Physical properties, such as the powder's color, texture, mass, and volume can give us certain clues about the substance. For instance, certain substances may have a specific color or texture unique to them.

On the other hand, chemical properties are equally useful. These include reactions the powder has to various chemicals or heat, and its ability to burn or support burning. For example, if a powder reacts vigorously with an acid, it could be a base. If it burns with a certain color flame, it could be a specific type of metal.

Therefore, the choice between using physical or chemical properties often depends on the mystery powder in question. However, a combination of both types of properties can provide the most accurate identification.

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Hey there!

Mass = 640 g

Density = 0.8 g/mL

Volume = ?

Therefore:

D = m / V

0.8 = 640 / V

V = 640 / 0.8

V = 800 mL

hope that helps!

Answer:

The answer is: 0.8 Liters

Explanation:

In order to find the volume of the oil, we have to divide the weight of the oil over the density, so we are going to know the volume in mL:

(640 g) / (0.8 g/ml) = 800 mL

Now, if we want the answer in liters, and we know 1 L (liter) is 1000 mL (mililiters), just divide 800 mL over 1000.

Hey there!

Given the reaction:

P4 + 10 Cl2  ------------------ 4 PCl5

Molar mass P4 = 124 g/mol

Number of moles P4:

n = mass of solute / molar mass

n = 24.0 / 124

n = 0.1935  moles of P4

Therefore:

1 mole P4 --------------- 4 moles PCl5

0.1935 moles P4 ------- moles PCl5

moles PCl5 = 0.1935 * 4

= 0.774 moles of PCl5

Hope that helps!

Here are three everyday situations which it would be useful to identify unknown substances:

1. When you have two clear substances with no labels yet you are not sure which substance is water and which one is not and not knowing what this unknown chemical might do.

2. A stain on your clothes

3. When you are not feeling well and your sense of taste is not functioning well.

The ways that these can be identified is first, start by the appearance, for example the state, color, texture, etc. And secondly, use your sense of smell. This sense is also helpful in identifying whether the substance is something strong or not.

Everyday identification of an unknown substance can be done using spot tests, measuring optical properties, or additional tests for organic or inorganic compounds, utilizing simple tools such as lasers, protractors, and chemical reagents.

Identifying an unknown substance is crucial in various everyday situations, like determining if a liquid spill is water or some hazardous chemical. One practical method for identification is using a spot test, where a chemical reagent is added to the substance, and the presence of a specific substance is indicated, for example, through a color change. Another approach might involve determining the substance's optical properties using equipment such as a laser or a protractor to measure the substance's refractive index compared to a reference guide.

In situations where a mixture contains more than one substance, additional properties like density could be considered to differentiate substances, but recognizing composite materials would require more complex analysis that considers a combination of characteristics.

For organic or inorganic identification, specific chemical tests that highlight carbon presence could be utilized, as organic compounds characteristically contain carbon. A simple burn test could provide preliminary information: if the sample burns with a yellow flame, it's likely organic, indicating the presence of carbon.

Answer:- 0.34 M

Solution:- 127 grams of calcium nitrate are dissolved in water to make the volume of the solution 2300 mL. It asks to calculate the molarity of the solution.

Molarity is moles of solute per liter of solution. let's convert the given grams of the solute to moles on dividing it's grams by molar mass and convert the mL to L . Then the moles are divided by the liters to get the molarity. M is the symbol for molarity.

Calcium nitrate contains one Ca, two N and six O.  The molar mass is calculated as:

Molar mass = 40.078 + 2(14.007) + 6(15.999)

= 40.078 + 28.014 + 95.994

= 164.086 grams per mol

Conversion of grams to moles:

[tex]127g(\frac{1mol}{164.086g})[/tex]

= 0.774 mol

Conversion of mL to L:

[tex]2300mL(\frac{1L}{1000mL})[/tex]

= 2.3 L

Now, divide the moles by liters to get the molarity:

Molarity = [tex]\frac{0.774mol}{2.3L}[/tex]  = 0.34 M

So, the molarity of calcium nitrate solution is 0.34 M.

Answer 0.34 m

Explanation:

i got i right

if this is is a True or False question I think it would be (False). Because the continental crust is lighter than the oceanic crust, and the continental crust cannot subduct.

Answer:

False.

Explanation:

Ocean lithosphere is about 60km thick and very dense, whereas continental lithosphere is about 120km and less dense. That is why when they collide, ocean plates subduct under continental ones.

The correct answer is Step 2. Step 2 is incorrect in Ben's calculation.

Step 2: Divide the result obtained in step 1 by 60.

Ben should have multiplied by the result obtained in step 1 by 60. That give the km covered per minute. This is because 60 sec is equal to 1 min.

In 1 sec the distance covered is (4.9 x 1.6) km

So in 60 sec or in 1 min the distance covered will be (4.9 x 1.6 x 60) km

A hypothesis is a suggested solution for an unexplained occurrence that does not fit into current accepted scientific theory. The basic idea of a hypothesis is that there is no pre-determined outcome.

Answer:the answer is A

Explanation:

The answer is C, The sports drink

In the four-stroke engine cycle, the spark plug initiates the combustion reaction during the ignition stage, which is part of the power stroke. Correct timing of the spark is crucial for the engine's efficient operation.

The spark plug initiates the combustion reaction during the ignition stage of the four-stroke engine cycle. Specifically, ignition occurs in the third step of the cycle, known as the power stroke. This stage involves two main parts:

It is vital for the spark to occur at the correct time to ensure that the fuel burns efficiently and that the engine operates smoothly, avoiding issues such as knocking or pre-ignition.

Final answer:

The spark plug initiates the combustion reaction during the power stroke of the four-stroke engine cycle, which is when the majority of the engine's power is produced.

Explanation:

In the four-stroke internal combustion engine cycle, the spark plug initiates the combustion reaction during the power stroke. After the air-fuel mixture is compressed during the compression stroke, the spark plug ignites the mixture at the beginning of the power stroke. This ignition converts chemical potential energy into thermal energy, causing a significant increase in pressure that forces the piston down, thereby doing work on the crankshaft in an adiabatic process. The cycle consists of four main strokes: the intake stroke, the compression stroke, the power stroke, and the exhaust stroke. The power stroke is also when the engine delivers the majority of its power to the crankshaft, making it a critical part of the engine's operation.

Answer : The energy of photon = [tex]21.369\times 10^{-19}J[/tex]

Solution : Given,

Final energy level = 1

Initial energy level = 7

Formula used :

[tex]\frac{1}{\lambda}=R[ \frac{1}{n^2_{final}}- \frac{1}{n^2_{initial}}][/tex]    ..........(1)

where,

[tex]\lambda[/tex] = wavelength

R = Rydberg's constant = 1.0974 [tex]\times 10^7m^{-1}[/tex]

[tex]n_{final}[/tex] = final energy level

[tex]n_{initial}[/tex] = initial energy level

Now put all the given values in above formula (1), we get the value of wavelength.

[tex]\frac{1}{\lambda}=1.0974\times 10^7m^{-1} [\frac{1}{1^2}- \frac{1}{7^2}][/tex] =  [tex]1.0750\times 10^7m^{-1}[/tex]

[tex]\lambda=0.9302\times 10^{-7}m[/tex]

Now we have to calculate the energy of photon by using formula,

[tex]E=\frac{h\times c}{\lambda}[/tex]

where,

E = energy

h = planck's constant = [tex]6.626\times 10^{-7}Js[/tex]

c = speed of light = [tex]3\times 10^8m/s[/tex]

[tex]\lambda[/tex] = wavelength

put all the values in this formula, we get the energy of photon.

[tex]E=\frac{6.626\times 10^{-7}Js\times 3\times 10^8m/s}{0.9302\times 10^{-7}m}[/tex] = [tex]21.369\times 10^{-19}J[/tex]

The energy of the photon emitted when an electron in a hydrogen atom transitions from n=7 to n=1 is -13.1 eV or 2.1 x 10^-18 J. This means the atom is emitting energy.

To calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n=7 to n=1, we can use the following equation for the energy differences in a hydrogen atom: ΔE = E_final - E_initial = -13.6 eV (1/n_final² - 1/n_initial²). In this case, the final state (n_final) is 1 and the initial state (n_initial) is 7.

Substitute these values into the equation to get: ΔE = -13.6 eV (1/1² - 1/7²) = -13.1 eV. This indicates that the energy of the photon emitted is 13.1 electron volts (eV). The negative sign indicates energy emission.

The numerical value can alternatively be converted to Joules (the SI unit for energy) by multiplying with the charge of an electron (1.6 x 10^-19 C): ΔE = 13.1 eV * 1.6 x 10^-19 C/eV = 2.1 x 10^-18 J.

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Answer:  2 H₂  +  O₂    →    2 H₂O

Reasoning:

When balancing an equation, what you are trying to do is to ensure that the amount of each atom on the right side (reactant side), is equal to the amount of each atom on the left side (product side), because of the law of conservation of energy.

∴ the balanced equation is     2 H₂  +  O₂    →    2 H₂O

Answer:

A. The rate of reaction increase

Explanation:

Explanation:

When a charged object is brought near a neutral object and when both of them touch each other then the neutral object also acquires the same charge that is present on the charged object.

This process of charge transfer is known as conduction.

So, when a ruler that is negatively charged touches a metal rod then the metal rod also becomes negatively charged because of conduction process.

This is because negative charge moves from the rules towards the metal rod and hence, it spreads over to the metal rod.

When you rub a ruler against a metal rod, something called charging by friction happens and the ruler can transfer charge to the rod.

When you rub a ruler against a metal rod, something called charging by friction happens and the ruler can transfer charge to the rod. Here is a simple explanation of how charge is transferred, explained step-by-step:

Starting Point: At first, the ruler and metal rod have the same amount of positive and negative charges, which makes them neutral.

Contact: The ruler touches the metal rod. When the ruler touches the rod, some of the electrons from the atoms in the ruler can move to the atoms in the rod.

To create friction, we rub the ruler against the metal rod while they touch each other. When you rub the ruler against the rod, they touch each other more strongly and exchange electrons.

When the ruler rubs against the rod, some of the electrons from the ruler's surface may move onto the rod's surface. This movement of electrons creates an uneven charge between the two objects.

Charge separation occurs when electrons are transferred. In this case, the ruler has gained extra electrons and becomes negatively charged, while the metal rod loses electrons and becomes positively charged.

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Hello there!

First you had to multiply by the density by the volume since D=M/V. Please make sure when your units has the same thing and it should be cancel it out.

2.3g/mL*30 mL= 69L is the right answer.

Hope this helps!

Thank you for posting your question at hereon Brainly.

-Charlie

The mass of a liquid is determined by multiplying its volume by its density. Given the density of 2.3 g/mL and the volume of 30 mL, the mass of the liquid is 69 g.

The mass of a liquid can be ascertained by multiplying its volume by its density. This is due to the relationship: mass = volume x density. Given the density of the liquid is 2.3 g/mL and the volume is 30 mL, we calculate the mass as: mass = volume x density = 30 mL x 2.3 g/mL = 69 g. Hence, the mass of the liquid is 69 g.

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The cell membrane is the structure responsible for maintaining the homeostasis of the cell.

The structure responsible for maintaining the homeostasis of the cell is the cell membrane. It acts as a barrier that controls the movement of substances in and out of the cell, allowing the cell to maintain a stable internal environment. The cell membrane is made up of a phospholipid bilayer that is selective in what it allows to pass through.

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