Help pls I don’t know the answer

Answer:

There are three main types of recycling: primary, secondary, and tertiary.Single-stream recycling is a system in which all recyclables, including newspaper, cardboard, plastic, aluminum, junk mail, etc., are placed in a single bin or cart for recycling. ... While collections costs are lower with a single stream system, processing costs are much higher.

Explanation:

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Answer:

asexual cell

Explanation:there are mainly 2 types sexual and asexual i would say asexual because they grow without another parent and don't have a nucleus.

Given :

A compound is found to be made up of 3.21 g Carbon and 1.02 g Oxygen.

To Find :

The percent composition from this data.

Solution :

We know, percentage composition is given by :

[tex]\%mass = \dfrac{mass}{mass of compound}\times 100[/tex]

So, percentage composition of Carbon is :

[tex]\%Carbon = \dfrac{3.21}{3.21+1.02}\times 100\\\\\%Carbon = \dfrac{3.21}{4.23}\times 100\\\\\%Carbon = 75.89 \%[/tex]

Since, compound is made up of Carbon and Oxygen.

So, %Oxygen is ( 100 - 75.89 )% = 24.11%

Hence, this is the required solution.

Explanation:

Transverse waves are always characterized by particle motion being perpendicular to wave motion. A longitudinal wave is a wave in which particles of the medium move in a direction parallel to the direction that the wave moves.

Answer:

d.) using larger crystals of the solid.

Explanation:

All of these can affect the rate at which a solid dissolves in water.

Answer:

[tex]d=1.78\times 10^{-7}\ Dg/\mu m^3[/tex]

Explanation:

Given,

The density of Helium is [tex]1.78\times 10^4\ g/cm^3[/tex]

We need to find the density in Dg/μm

We know that,

1 g = 10 dg

1 cm³ = 10¹² μm³

So,

[tex]d=1.78 \times 10^4\ g/cm^3\\\\=1.78 \times 10^4\times \dfrac{10\ dg}{10^{12}\ \mu m^3}\\\\=1.78\times 10^{-7}\ Dg/\mu m^3[/tex]

So, the density of Helium is equal to [tex]1.78\times 10^{-7}\ Dg/\mu m^3[/tex].

Answer:

[tex]C=0.91\frac{J}{g\°C}[/tex]

Explanation:

Hello there!

In this case, according to the given information, it is possible to recall the equation to calculate the heat, Q, in these calorimetry problems as shown below:

[tex]Q=mC(T_f-T_i)[/tex]

Thus, given the absorbed heat, mass and temperatures, we can easily calculate the specific heat of the metal as shown below:

[tex]C=\frac{Q}{m(T_f-T_i)}[/tex]

Then, by plugging in we obtain:

[tex]C=\frac{1350J}{55.0g(47.0\°C-20.0\°C)} \\\\C=0.91\frac{J}{g\°C}[/tex]

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Answer: Ik its too late but the answer is yeast.

Explanation: Sugar is yeasts food. If you mix sugar with yeast, and put it in something such as bread, a bottle with a balloon over it, or etc. It will cause it to rise.

Heres the best help i can give you There is a couple different ways to determine if a bond is ionic or covalent. By definition, an ionic bond is between a metal and a nonmetal, and a covalent bond is between 2 nonmetals. So you usually just look at the periodic table and determine whether your compound is made of a metal/nonmetal or is just 2 nonmetals

Answer:

Miscible

Explanation:

Mixed completely

Answer:Granite forms as magma cools far under the earth's surface. Because it hardens deep underground it cools very slowly. This allows crystals of the four minerals to grow large enough to be easily seen by the naked eye. Look at the photo of granite above, notice the different crystals in the rock

Explanation:

The partial pressure inside a gas mixture shall consist of the notional pressure of that constituent gas if the whole quantity of its starting material alone was occupied at the same temperature. The partial gas pressure is a measure of thermodynamic action in the particles of a gas, and the calculation can be defined as follows:

Given:

[tex]\to \bold{ P_T=3.50 \ atm}\\\\\to \bold{P_B=1.25 \ atm}\\\\[/tex]

To find:

partial pressure=?

Solution:

Using formula: [tex]\bold{P_T=P_A+P_B}\\\\[/tex]

                   [tex]\to \bold{3.50=P_A+1.25}\\\\\to \bold{P_A=3.50-1.25}\\\\\to \bold{P_A=2.25}\\\\[/tex]

As we know that pressure is not negative and as [tex]\bold{P_T}[/tex] is total pressure so, it has a large value, and[tex]\bold{ P_A , P_B}[/tex] is partial.

Therefore, the final answer is "Option C".

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Answer:

false

Explanation:

energy can't be destroyed

Answer:

number of protons in the atom

Explanation:

Everything else has something to do with neutrons or weight, which you cannot know from just the atomic number. The atomic number is how many protons are in an element

Answer:

Mutation

Explanation:

Mutation refers to the change in the structure of a gene. This change occurs when changes are made in the base/nucleotide sequence on a gene.

An example of such error made during DNA replication are incorrectly paired nucleotides or insertion/deletion of nucleotides during replication.

Answer:

(a)  The unit cell edge length 0.421 nm

Explanation:

Lets calculate -:

Given -

density = [tex]3.58g/cm^3[/tex]

Molecular weight of MgO = 24.31 +16

                                           [tex]40.13 g/mole[/tex]

Avagadro number = [tex]6.022\times10^2^3[/tex]

In rock salt structure , there are four anions and four cations , hence Z=4 (Number of formula per unit cell)

Now, using the formula -

                     [tex]d=\frac{ZM}{N_Aa^3}[/tex]

               [tex]a=[\frac{ZM}{N_Ad}]]^\frac{1}{3}[/tex]

Now, putting the given values

   [tex]a=\frac{4\times40.13g/mole}{6.022\times10^2^3\times(3.58g/cm^3)}[/tex]

  [tex]4.21\times10^-^8 cm[/tex]

  = 0.421 nm

Hence , the unit cell edge length = 0.421 nm

The unit cell edge length of magnesium oxide (MgO) is equal to 0.421 nanometer.

Given the following data:

Scientific data:

To determine the unit cell edge length:

Mathematically, the unit cell edge length for a face-centered cubic (FCC) structure is given by the formula:

[tex]a=\sqrt[3]{\frac{ZM}{\rho N_A} }[/tex]

Where:

Substituting the given parameters into the formula, we have;

[tex]a=\sqrt[3]{\frac{4 \; \times \;40.31}{3.58\; \times \;6.02 \times 10^{23}} }\\\\a=\sqrt[3]{\frac{161.24}{2.16 \times 10^{24}}}\\\\a=\sqrt[3]{7.47 \times 10^{-23}} \\\\a=4.21 \times 10^{-8}\;meter[/tex]

Note: [tex]1 \;nanometer = 1 \times 10^{-9} \;meter[/tex]

a = 0.421 nanometer.

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Answer:

i think so

Explanation:

just eat them anyways

Answer: Yes they are

Explanation: Where's the picture?

Answer:

mushrooms bacteria mold

Explanation:

A  layer represents the radiative zone which is at the centre of the cross-sectional diagram.

The layer of a star that lies just outside the core, to which radiant energy is transferred from the core in the form of photons.

In the Sun, the region between the solar core at 0.2 of the Sun's radius and the outer convection zone at 0.71 of the Sun's radius is referred to as the radiation zone, although the core is also a radiative region.

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B

A is inner core B is outer core and there is a few other layers but from what I know looking at this the second layer has always been the radioactive zone.

If you get this right I would love brainiest

thats kinda hot not even gon'

Explanation:

The terms ‘sand’ and ‘soil’ are often interchanged and used synonymously with one another. Many people consider them the same, but when scrutinized, they are quite different from each other. First and foremost, sand is a type of soil–so is silt, clay, peat, and loam. These types of soils are generated when rocks break up into their constituent parts and are acted upon by outside forces, such as wind, water, and natural salts. The broad definition of soil refers to the loose layer of earth that covers the surface of the planet. Sand, on the other hand, is defined as loose material that consists of rocks or mineral grains.

Answer:

soil is defined as the top layer of the land surface of the earth that is composed of disintegrated rock particles, humus, water, and air.

sand is defined as a loose material that consists of rocks or mineral grains.

Explanation:

Answer:

many bacteria are resistant to penicillin and other β-lactam antibiotics - some bacteria have beta-lactamase enzymes and are able to break down the antibiotics - as a result, many drugs are combined with other drugs that are β-lactamase inhibitors.

Explanation:

Quizlet

Answer: Basic

Explanation:

A solution with a pH of more than 7 is considered basic.

Answer:

-411 kj

Explanation:

We solve by using this formula

∆U = ∆Q + ∆W

This formula is the first law of thermodynamics

Change in internal energy U = +241

Heat gained by system Q = 652

Putting the value into the equation

+241 = 652 + W

Workdone = 241 - 652

Workdone = -411 kj

Since work done is negative it means that work was done by the system

Answer:

5 mL

Explanation:

As this is a problem regarding dilutions, we can solve it using the following formula:

Where subscript 1 refers to the initial concentration and volume, while 2 refers to the final C and V. Meaning that in this case:

We input the data:

And solve for V₁:

Answer:

5 mL of 5.0 M H₂SO₄ (aq) are needed to prepare 100 mL of 0.25 M H₂SO₄ (aq).

Explanation:

In chemistry, dilution is the reduction of the concentration of a chemical in a solution.

Then, dilution consists of preparing a less concentrated solution from a more concentrated one, and it consists simply by adding more solvent to the same amount of solute. That is, the amount or mass of the solute is not changed, but the volume of the solvent varies: as more solvent is added, the concentration of the solute decreases, since the volume (and weight) of the solution increases.

A dilution is calculated by the expression:

Ci*Vi = Cf*Vf

where:

In this case, you know:

Replacing:

5 M*Vi = 0.25 M* 100 mL

Solving:

[tex]Vi= \frac{0.25 M*100 mL}{5 M}[/tex]

Vi= 5 mL

5 mL of 5.0 M H₂SO₄ (aq) are needed to prepare 100 mL of 0.25 M H₂SO₄ (aq).

Answer:

Rice is grown in rainy regions.

The river flooded the whole region.

He explored the region around the South Pole.

Explanation:

Hope this helped!

Answer:

D. 18g

Explanation:

To get the answer, we will use an equation to convert the grams of C2H5OH to moles of C2H5OH, then I will convert the moles of C2H5OH to moles of CO2, and then I will convert the moles of CO2 to grams of CO2.

9.2g C2H5OH / 46.07g C2H5OH = 0.199 mol C2H5OH

0.199 mol C2H5OH (2 mol CO2 / 1 mol C2H5OH) = 0.398 mol CO2

0.398 mol CO2 (44.01g CO2 / 1 mol CO2) = 17.515g CO2

The answer closest to our answer is answer choice D. 18g

Therefore, the answer is D

In normal temperatures, carbon dioxide is a colorless, non-flammable gas, its calculated value is "18 gram".

Equation:

[tex]\to \bold{C_2H_5OH\ (l)+3O_2\ (g) \to 2CO_2\ (g)+3H_2O\ (g)}[/tex]

In the above-given scenario, We'll utilize an equation that converts grams of ethanol to moles of ethanol, then converts moles of ethanol to moles of carbon dioxide, and finally, transforms the moles of carbon dioxide into grams of carbon dioxide to get the result.

Following are the calculation of the conversion of carbon dioxide:

[tex]\to \frac{9.2\ g\ C_2H_5OH }{46.07\ g\ C_2H_5OH} = 0.199\ mol C_2H_5OH\\\\\to 0.199\ mol\ C_2H_5OH \ (\frac{2\ mol\ CO_2}{ 1\ mol\ C_2H_5OH}) = 0.398\ mol\ CO_2\\\\\to 0.398\ mol \ CO_2 \ (\frac{44.01\ g\ CO_2}{1 \ mol\ CO_2}) = 17.515\ g\ CO_2 \approx 18\ g \ CO_2\\\\[/tex]

Therefore, the answer is "Option D".

Find out more about the CO2 here:

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Answer:

The Answer is gonna be C. the same amount in nuclear fusion reactions as it is in chemical reactions