An element is BEST described as a substance that:
is made of atoms
Cannot be broken down into other substances
Contains water
Is a metal used in kettles​

Explanation:

1 is a process that occurs when gases in earth's atmosphere trap the sun's heat .

2 . heat in the atmosphere to warm the planet .

I only know the first too sorry ✨

Answer:

8.43 x 1024 moles of I

Explanation:

Answer:  There are 3.3×1023atoms in 0.54 moles Pb. Explanation: To calculate the number of atoms in Pb, we use Avogadro's number,

Explanation:

Answer:

Here is every answer for analog and digital (in order)

Analog:

Digital (in order):

Explanation:

I did mine in bullet points, hopefully this helped!

Analog:

Signal Shape: Smooth and continuous

Numerical Values for Signal Estimations: Analog signals speak to one ceaseless variable as the result of another ceaseless time-based variable.

Amount of Information that can be transmitted: analog circuits can conduct as it were reasonably low-speed information communications.

Energy necessities: light, sound, temperature, position, and pressure Privacy and security : not encrypted

Clarity of Signal: clamor influences clarity and quality, commotion is amplified,

Digital:

Signal shape: stepping, square, and discrete

Numerical Values for Signal Measurements: digital communication methods transmit a complete measured value, in other words both a numeric value and a unit of measurement

Amount of data that can be transmitted: First of all, it is theoretically possible to transmit digital signals directly.

Energy requirements: voltage, accoustic pressure.

Privacy and security: encrypted

Clarity of signal: noise is lower in amplitude, electronics can ignore the noise, quality of signal is maintained, signal is high

Analog signal could be a continuous signal which speaks to physical estimations.

Digital signals are discrete time signals created by computerized balance.

Example :Human voice in discuss, analog electronic gadgets. Computers, CDs, DVDs, and other advanced electronic gadgets.

Answer:

2.11

Explanation:

1/0.473 = 2.11

Answer: What type of chemical reaction is rusting of iron?

Rust is formed when iron reacts with oxygen in moist air. The following chemical equation represents the reaction: 4Fe + 3O2 → 2Fe2O3. Water is necessary for the oxidation reaction to occur and to facilitate transport of the electrons.

Answer:

The daily change from daylight to darkness is caused by:the rotation of the Earth on its axis. If the Earth did not rotate as it does, the day/night cycle would be very different or possibly even nonexistent.

Explanation:

Answer:

because water wets stuff expect for fire.

Answer:

The meaning of wet is covered or saturated with water or another liquid, showing that is a glass is covered in water it is considered wet.

Explanation:

Answer:

you didn't specify what the presentation was about. However, I can help you by showing you how to do this activity.

When making notes of the sources, you must show when these sources were built and what is their direct relationship with your research, in addition to highlighting the concepts and parts you will use in your presentation. It is also important that you show the connection between the sources, that is, how they come together to collaborate for your presentation. We must not forget that you must have different sources, that is, different media, such as websites, books, magazines, interviews, videos, among others.

After you have highlighted which parts of the sources you will use in the presentation, you should reread those parts and make topics about which point of those parts will be used in your presentation, that is, you must show the most revealing points, those to which you won't talk about.

Answer:

synthesis reaction

Explanation:

synthesis reaction where reactants unite to form a single product.

Answer:

i needed that lol

thank you

Explanation:

Answer:

1×10^5

Explanation:

Pressure = Force/Area

P= 10/0.0001

P= 10000

P=1×10^5

Answer:

Molarity of our solution= 0.46=0.5

Explanation:

When diluting a solution we can use the formula: 1 1 = 2 2

= M= Molarity of the solution

=V=volumes

On the left side, we'll put what we know/already have and on the right side of the formula we'll put down what we want to dilute it to.

Let's plug in what we already know.

(0.700M)(2L) = (M2)(3L)

Solve for M2 by dividing both sides by 3 so M2 will be by itself.

(0.700M)(2L)/(3L) = M2

M2= 0.46, we can round it up to 0.5

Answer:

Explanation:

Moles of Pb(NO3)2 =  mass/molecular mass

= 50.0 grams/(207.20*1 + 14.01*2 + 16*6)

= 50.0 grams/331.22

= 0.15 moles

Moles of NaI

= 30/(22.99+126.9)

= 30/149.89

= 0.2 Moles

A. NaI is less 2x Pb(NO3)2 so NaI is the limiting reagent.

B. The ratio is 1 to 2 so there is 0.15 - 0.2/2 = 0.05 mole

or 16.78 grams of Pb(NO3)2 left.

C. As NaI is limiting, only 0.2 Moles of NaNO3 is formed.

Mass =  Moles * Molecular Mass

Molecular Mass of NaNO3 can be calculated as:  

Na - 22.99

N - 14.01

O - 3(16) = 48

23+14+48 = 85gram / mole

Thus, Mass =  0.2*85  = 17 gram of NaNO3

Mass is conserved in a chemical reaction.

Mass of PbI2 can be calculated as:

50+30-16.78-17

= 46.3 gram of PbI2

Mass =  

12.75

Thus, 12.75g of Sodium Nitrate can be formed

Answer:

Explanation:

Pb(NO3)2 (aq) + 2 NaI (aq) --> PbI2 (s) + 2 NaNO3 (aq)

MM for each compound -

Pb(NO3): 207 + 14x2 + 16x3x2 = 331

PI2: 207 + 127x2 = 461

NaI: 23 + 127 = 150

NaNO3: 23 + 14 + 16x3 = 85

Moles of Pb(NO3)2 = 50/331 = 0.15

Moles of NaI = 30/150 = 0.2

Ratio of moles is 1:2

So NaI is limiting

Limited to 0.2/2 = 0.1 mole of Pb(NO3)2

Excess = 0.15 - 0.1 = 0.05 mole

Mass remains = 0.05x331 = 16.55 grams

Moles of NaNO3 formed = Moles of NaI reacted = 0.2

Mass = 0.2x85 = 17 grams

Moles of PbI2 formed = Moles of Pb(NO3)2 reacted = 0.1

Mass = 0.1x461 = 46.1 grams

If 12 grams of NaNO3 actually formed in the reaction,

percent yield = 12/17x100% = 70.6%

Answer:

Properties of transition elements

they are all metals and that most of them are hard, strong, and lustrous, have high melting and boiling points, and are good conductors of heat and electricity.

Answer:

91.28 g

Explanation:

The mass of C₃H₈ used is 91.08g

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.

A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.

Given,

Molecules of carbon dioxide = 3.75 × 10²⁴

We know that,

1 mole = 6.023 × 10²³ molecules

Moles of carbon dioxide = 3.75 × 10²⁴ ÷ 6.023 × 10²³

                                         = 6.226 moles

From the reaction, 3 moles of carbon dioxide is produced by 1 mole of C₃H₈.

So, 6.226 moles will be produced by (1 ÷ 3) × 6.226

                                          = 2.07 moles of C₃H₈

Mass of C₃H₈ = moles × molar mass

                      = 2.07 × 44

                     = 91.08g

Therefore, mass of C₃H₈ used is 91.08g

Learn more about Moles, here:

https://brainly.com/question/20486415

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Answer:

Temperature and precipitation

Explanation:

They determine how quickly weathering will be, and what kind of organic material may be available on the inside of the soils.

Temperature and precipitation is the major determining factor in soil formation. They define the type of organic material that can be present inside the soils as well as how rapidly weathering will occur.

The bioactive, porous media that has grown in the top layer of the Earth's crust is known as soil. Being a source of water as well as nutrients, a filter for harmful wastes, a site for their breakdown, and a participant inside the cycle of elements such as carbon through the planet's ecosystem, soil constitutes one of the main substrates of life on Earth.

It has changed as a result of weathering processes influenced by geographical, geologic, biological, and climatic factors. A practical understanding of soils including their management has also developed out of need since the development of agriculture with forestry in the eighth millennium BCE. Temperature and precipitation is the major determining factor in soil formation. They define the type of organic material that can be present inside the soils as well as how rapidly weathering will occur.

Therefore, temperature and precipitation is the major determining factor in soil formation.

To know more about soil, here:

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Answer:

[tex]T_f=57.3\°C[/tex]

Explanation:

Hello there!

In this case, for this calorimetry problem, it is possible to realize that the hot water at 87.6 °C is cooled down whereas the cold water at 34.5 °C is heated up, according to:

[tex]Q_{cold}=-Q_{hot}[/tex]

Which in terms of mass, specific heat (cancelled out because they have the same value for being water) and temperature difference, is:

[tex]m_{cold}C_{cold}(T_f-T_{cold})=-m_{hot}C_{hot}(T_f-T_{hot})\\\\m_{cold}(T_f-T_{cold})=-m_{hot}(T_f-T_{hot})[/tex]

Thus, solving for the final temperature, we obtain:

[tex]T_f=\frac{m_{cold}T_{cold}+m_{hot}T_{hot}}{m_{cold}+m_{hot}}[/tex]

Then, we plug in to obtain:

[tex]T_f=\frac{200g*34.5\°C+150g*87.6\C}{200g+150g}\\\\T_f=57.3\°C[/tex]

Best regards!

Answer:

8-)

Explanation:

Baking powder is a dry chemical leavening agent, a mixture of a carbonate or bicarbonate and a weak acid. The base and acid are prevented from reacting prematurely by the inclusion of a buffer such as cornstarch. Baking powder is used to increase the volume and lighten the texture of baked goods

Answer:

1.2x10⁻²³M = [Ag⁺]

Explanation:

The Kf of Ag(CN)₂⁻ is:

Ag⁺(aq) + 2CN⁻ → Ag(CN)₂⁻(aq)

Kf = 1.0x10²¹ = [Ag(CN)₂⁻] / [Ag⁺] [CN⁻]²

Where [] are equilibrium concentrations.

The initial concentrations of the reactants are:

[Ag⁺] = 3.0x10⁻³M * (130mL / 355mL) = 1.10x10⁻³M

335mL is the total volume of the solution

[CN⁻] =  0.14M * (225mL / 355mL) = 0.089M

In equilibrium, the concentrations are:

[Ag⁺] = 1.10x10⁻³M - X

[CN⁻] = 0.089M - 2X

Ag(CN)₂ = X

Replacing in Kf expression:

1.0x10²¹ = [Ag(CN)₂⁻] / [Ag⁺] [CN⁻]²

1.0x10²¹ = [X] / [1.10x10⁻³ - X] [0.089 - 2X ]²

1.0x10²¹ = [X] / 8.7131×10⁻⁶ - 0.0083126 X + 0.3604 X² - 4 X³

8.7131×10¹⁵ - 8.3126×10¹⁸ X + 3.604×10^20 X² - 4x10²¹ X³ = X

8.7131×10¹⁵ - 8.3126×10¹⁸ X + 3.604×10^20 X² - 4x10²¹ X³ = 0

X = 0.0011M → Right solution.

X = 0.0445M → False solution. Produce negative concentrations

Replacing:

[Ag⁺] = 0

[CN⁻] = 0.0868M

Ag(CN)₂ = 0.0011M

The equilibrium will shift to the left just a little bit until produce a determined amount of Ag⁺ that we can write as:

[Ag⁺] = X

Thus:

1.0x10²¹ = [0.0011] / [X] [0.0868M ]²

Answer:Matter is made up of only charged particles.

Explanation: Took the test

Answer:

The answer is offspring

Explanation:

Answer:

Reaction

Mg+H2SO4 ----》MgSO4+H2

so calculate the moles of magnesium first

moles of magnesium = given mass of mg/molar mass of magnesium

moles = 4/24.30

moles = 0.1646

One mole of magnesium produces one mole of magnesium sulphate

so 0.1646 moles of mg will produce 0.1646 moles of MgSO4

Mass of MgSO4 = 0.1646× 120.366

MgSO4 = 19.81 gm

conclusion the mass of magnesium sulphate that would be obtained from 4g of

magnesium is 19.81 gm!!

I d k it's right or wrong but i tried :)

Answer:

1) Hom DOMINANT

2) Hom recessive

3) Hetero DOMINANT

4) Hom DOMINANT

5) Hetero DOMINANT

6) Hom recessive

Explanation:

Answer:

D.lodine

Explanation:

Lodine is a nonsteroidal anti-inflammatory drug . It works by reducing hormones that cause inflammation and pain in the body. Lodine is used to treat mild to moderate pain, osteoarthritis, or rheumatoid arthritis.

I hope it's helpful for you......

Answer: [tex]Fe^{3+} > Mn^{4+}[/tex] > [tex]V^{3+}[/tex] = [tex]Ni^{2+}[/tex] > [tex]Cu^+[/tex]

Explanation:

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.

Fe: 26: [tex]1s^2s^22p^63s^23p^64s^23d^{6}[/tex]

[tex]Fe^{3+}:23:1s^2s^22p^63s^23p^63d^{5}[/tex] : 5 unpaired electrons

Mn: 25: [tex]1s^2s^22p^63s^23p^64s^23d^{5}[/tex]

[tex]Mn^{4+}:23:1s^2s^22p^63s^23p^63d^{3}[/tex] : 3 unpaired electrons

V: 23: [tex]1s^2s^22p^63s^23p^64s^23d^{3}[/tex]

[tex]V^{3+}:23:1s^2s^22p^63s^23p^63d^{2}[/tex] : 2 unpaired electrons

Ni : 28 : [tex]1s^2s^22p^63s^23p^64s^23d^{8}[/tex]

[tex]Ni^{2+}:23:1s^2s^22p^63s^23p^63d^{8}[/tex]: 2 unpiared electrons

Cu : 29 : [tex]1s^2s^22p^63s^23p^64s^13d^{10}[/tex]

[tex]Cu^{+}:23:1s^2s^22p^63s^23p^63d^{10}[/tex]: 0 unpaired electrons

Thus the order of decreasing number of unpaired electrons:

[tex]Fe^{3+} > Mn^{4+}[/tex] > [tex]V^{3+}[/tex] = [tex]Ni^{2+}[/tex] > [tex]Cu^+[/tex]

Answer:

Q.1

Given=

V1=6.5ltr

P1=191.0kPa

T1= 750.pK

P2= 101.3kpa

T2= 298K

V2=?

Combined gas law: P1V1/T1 = P2V2/T2

 Use the gas laws for pressure, volume and temperature calculations

Now,

191.0×6.5/750= 101.3×V2/298

V2 = 191.0×6.5×298/750×101.3

On solving further

V2 = 4.86 ltr!

4.86 volume with the steam occupy in the atmosphere!

Q.2

Scientific Reasoning:-

Temperature is directly to proportional to the pressure in second scenario the temperature was reduced to nearly half of the first one hence the pressure also decreased simultaneously, and we all know according to charles law The volume of a given gas sample is directly proportional to its absolute temperature so the decreasing temperature affected the amount of volume that decreased!

Explanation:

Plant cells have a cell wall, as well as a cell membrane. In plants, the cell wall surrounds the cell membrane. This gives the plant cell its unique rectangular shape. Animal cells simply have a cell membrane, but no cell wall.