Celina has a water sample that's contaminated with salt and microorganisms. Which method should she use to purify the water ?

There're three termination codons

IN RNA IN DNA NAME

UAG TAG "amber"

UAA TAA "ochre"

UGA TGA "opal"

Answer:

There are three termination code words.

Explanation:

From the question stated, we have three termination code words as shown below.

IN RNA              IN DNA               NAME        

UAG                    TAG                  "amber"

 UAA                     TAA                  "ochre"

UGA                    TGA                    "opal"

most solids contract (shrink) when they get cold.

        Density  =  (mass) / (volume)

If mass doesn't change but volume gets smaller,  then density increases.

A basic salt or alkali sat is any salt that hydrolyzes to form a basic solution.

In simple terms, It is a salt which is when dissolved in water form a solution of PH less than 7.

It contains amounts of both hydroxide and other anions.

White lead is an example. It is basic lead carbonate, or lead carbonate hydroxide.

A basic salt is an ionic compound formed from the reaction of a strong base and a weak acid, resulting in a solution that releases OH⁻ ions, making it basic.

Answer:  

F. The baking soda combined with the hydrochloric acid and bubbles formed.

Explanation:

The formation of gas bubbles is usually a sign of a chemical reaction.

G. is wrong because the absorption of a liquid by a solid is a physical process. Think of using a paper towel to clean up spilled water.

H. is wrong because the dissolving of a solid is a physical process. Think of dissolving sugar in your coffee.

J. is wrong because evaporation is a physical process. Think of a puddle of water drying up in the hot sun.

1. Metallic bond is a type of chemical bond.

2. Metallic bond is formed between electrons and positively charged metal ions.

3. Metallic radius is defined as one-half of the distance between the two adjacent metal ions.

4. Metallic bond increace electrical and thermal conductivity.

5. Metals conduct heat, because when free moving electrons gain energy (heat) they vibrate more quickly and can move around.

You need to change them to mole

mole = mass / Molar mass

mole of Ca = 0.910 g / 40.08 g/mol = 0.0227 mol

mole of N = 0.636 g  / 14.01 g/mol = 0.04539 mol

mole of O = 1.453 g / 16.00 g/mol = 0.0908 mol

Then, take the smallest number and divide for all number (in mol that I just found)

Ca = 0.0227 / 0.0227 = 1

N = 0.04539 / 0.0227 = 1.9999 (round it 2)

O = 0.0908 / 0.0227 = 4

So the empirical formula will be Ca1N2O4 ( CaN2O4 )

A. The amount of sugar

Answer: A) The amount of sugar

Explanation:

The independent variable is the one which can be changed, altered or even manipulated manually so as to bring changes and alteration over the dependent variable. The dependent variable is the variable in which changes occur due to independent variable. It is the outcome of the experiment.

The amount of sugar is the correct option. This is because of the fact that amount of sugar can bring a change over the chemical reaction and mass of chemicals being produced.    

The formation of bubbles and a colour change are signs of a chemical change.

One of the substances must have evolved the gas and changed into something else.

One of the substances must have changed into something else with a different colour.

Both above are chemical changes.

Evaporation and dissolving are physical changes, because the substances do not change their chemical structure in the process.

The correct answer should be

D: incredibly

Best Answer:  d  

the subject is who or what you are talking about- the glowing red coals  

the predicate is what they are doing- looked incredibly hot  

looked is your verb because that is what they are doing, how did they look? they looked hot, that is the adverb. the word that describes hot is incredibly, that is the pred adj. because adjectives describe.

Answer:

The seafloor

Explanation:

the bottom of the ocean, aka the sea floor.

usually made from sand

Answer:

H2O

Explanation:

Al2O3 has a higher melting point than Na2O. This is because the ionic bond between Al3+ ions and O2- ions is stronger than that between Na+ and O2-. The charge on the Al3+ ion is larger than that of the Na+ ion

Aluminium oxide has a higher melting point than sodium oxide due to the stronger bonding in its crystal lattice and higher lattice energy, which requires more energy to break the bonds during melting.

The reason why aluminium oxide (Al2O3) has a higher melting point than sodium oxide (Na2O) lies in their different types of bonding and bond strengths. Al2O3 is an ionic compound but with some covalent character, meaning that it has stronger bonds and thus requires more energy to break those bonds, leading to a higher melting point. This difference is largely a result of the contrast in the charge and size of the ions involved.

In contrast, Na2O is purely ionic and made up of larger ions with a lower charge. Consequently, Na2O has a weaker lattice energy than Al2O3, implying that less energy is needed to break the bonds in its structure, resulting in a lower melting point.

Furthermore, lattice energy is directly related to melting points in ionic substances that have similar structures. This underlines why Al2O3 with its higher lattice energy has a higher melting point compared to Na2O.

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Hey there!

No !! there is nothing to react. What else other than tin sulphate and zinc sulphate can you make - but then you have only what you started with .

Hope that helps!

If a ZnSO4 solution and a SnSO4 solution were mixed there will be no reaction.

Even though zinc is above tin in the electrochemical series, there will be no reaction when a ZnSO4 solution and a SnSO4 solution were mixed because the two compounds have the same anion.

Displacement reaction only occurs when two compounds have different anions and one of the metal cations involved is lower than the other in the electrochemical series.

From the explanation above, it is clear that, if a ZnSO4 solution and a SnSO4 solution were mixed there will be no reaction.

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Yes, this is a balanced chemical equation, and it obeys the Law of Conservation of Mass.

A balanced chemical equation obeys the Law of Conservation of Mass if there are the same numbers of each type of atom on each side of the reaction arrow.

N₂ + 3H₂ ⟶ 2NH₃

Let’s check the numbers.

Atom  On the left  On the right

   N            2                 2

   H            6                 6

We have the same numbers of H and O on each side of the reaction arrow.

The equation is balanced and it obeys the Law of Conservation

of Mass.

The air escapes into the atmosphere.

An emulsion is a colloidal dispersion of one liquid in another liquid in which it does not dissolve.

Ice cream is essentially an emulsion of the fat in milk with a sugar solution trapped in a network of small ice crystals. Other chemicals are added to prevent the emulsion from separating, and air bubbles are mixed into the semisolid mixture.

Up to 50 % of the volume of ice cream can be air.

When the ice cream melts, the air bubbles are no longer trapped. They just escape into the atmosphere.

If you re-freeze the melted ice cream, its volume will be much less than the original.

Hey there!

Given the reaction is :

Cl2(g) +  3 F2(g) = 2 ClF3(g)

The rate of a reaction is given by:

Rate = - Δ[Cl2] / Δt

=  (-1/3  Δ[F2] / Δt )   + ( 1/2  Δ[ClF3] / Δt )

Given that :  Δ[Cl2] / Δt  = - 0.099 M/s

From above rate law:

(- Δ[Cl2] / Δt ) =  ( -1/3  Δ[F2] / Δt )

( Δ[F2] / Δt )  = 3 *  ( Δ[Cl2] / Δt )

= 3 * ( - 0.099 ) =   - 0.297  M/s

Therefore:

Δ[F2]/Δt  = -0.297 M/s

Hope That helps!

The rate of consumption of fluorine in the reaction has been -0.297 M/s.

The balanced chemical equation for the reaction has been:

[tex]\rm Cl_2\;+\;3\;F_2\;\rightarrow\;2\;ClF_3[/tex]

According to the reaction for the formation of 1 mole of chlorine fluoride, 1 mole of chlorine reacts with 3 moles of fluorine.

The amount of fluoride consumed in unit time has been 3 times the amount of chlorine consumed in the same time.

The [tex]\rm \dfrac{\Delta Cl_2}{\Delta t}[/tex] has been given to be -0.099 M/s.

It states that amount of chlorine consumed in 1 sec = 0.099 M.

The negative sign has been implied with the deduction in the concentration of Cl per second.

The amount of fluorine consumed at the same time has been 3 times the amount of Cl consumed.

Fluorine consumed ([tex]\rm \Delta\;F_2[/tex]) = 3 [tex]\times[/tex] 0.099 M

Fluorine consumed = 0.297 M.

The amount of fluorine consumed ([tex]\rm \Delta\;F_2[/tex]) per second is 0.297 M.

The rate of the depletion of fluorine in the reaction can be given as:

[tex]\rm \dfrac{\Delta\;F_2}{\Delta t}[/tex]= -0.297 M/s.

The rate of consumption of fluorine in the reaction has been -0.297 M/s.

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Answer: The average atomic mass of this elements is 56.7221 amu.

Explanation: The average atomic mass is the sum of the masses of its isotopes each multiplied by their natural abundances.

[tex]\text{average atomic mass}=\sum_{i=1}^{n}(mass)_i(\text{Fractional abundance})_i[/tex]            .....(1)

[tex]\text{Fractional abundance}=\frac{\%\text{ abundance}}{100}[/tex]

We are given 3 isotopes of an element.

For Isotope [tex]X^{55}[/tex],

Mass = 55 amu

Fractional abundance = 0.2780

For isotope [tex]X^{57}[/tex],

Mass = 57 amu

Fractional abundance = 0.4439

Total Fractional abundance = 1

For isotope [tex]X^{58}[/tex],

Mass = 58 amu

Fractional abundance = Total abundance - abundances of the other isotopes

Fractional abundance = 1 - 0.7219

                                     = 0.2781

Now, putting all the values in equation 1, we get

[tex]\text{Average atomic mass}= (55 amu\times 0.2780)+(57 amu\times 0.4439)+(58 amu\times 0.2781)[/tex]

Average atomic mass = 56.7221 amu.

Hey There!:

The density is the quotient between the mass of a material and the volume occupied by it, The density can be expressed for a substance or for a mixture of substances. For example, water density in ambient conditions is equal to 1.00 g/cm3, which means that in 1 cm³ or 1 mL, there are 1.0 g of water. Therefore:

D = m / V

D = 20 g / 5 mL

D = 4,0 g/mL

hope that helps!

The density of the object will be "4 g/mL". A further solution is provided below.

The given values in the question are:

Mass,

M = 20 g

Volume,

V = 5 mL

The density of the object will be:

→ [tex]Density = \frac{Mass}{Volume}[/tex]

By substituting the values, we get

→               [tex]= \frac{20}{5}[/tex]

→               [tex]= 4 \ g/mL[/tex]

Thus the above answer is right.

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Final answer:

The wavelength in a longitudinal wave is the distance from one compression to the next compression or from one rarefaction to the next rarefaction.

Explanation:

In a longitudinal wave, the wavelength is the distance from one compression to the next compression or from one rarefaction to the next rarefaction. This is akin to the peak to peak or trough to trough measurement in transverse waves.

Within the cycle of a longitudinal wave, areas of high pressure, or compressions, where the particles are closest together, and areas of low pressure, or rarefactions, where the particles are further apart, alternate regularly. Consequently, the wavelength can be perceived as the spatial period of the wave—the distance over which the wave's shape repeats.

The understanding of these concepts is crucial for analyzing wave behaviors, such as sound propagation, and the impacts of phenomena like the Doppler effect.

Answer:- B. 0.343

Solution:- Hot metal is added to water so the heat is gained by water and lost by the metal. We assume no heat is lost to the surroundings, so the heat lost by metal is totally used to raise the temperature of water.

First, we will calculate the heat gained by water using the formula:

[tex]q=mc\Delta T[/tex]

where, q is the heat energy, m is the mass, c is specific heat and delta T is change in temperature.

For water:

m = 8.4 g

c = [tex]\frac{4.184J}{g.^0C}[/tex]

[tex]\Delta T=52.1-20=32.1 ^0C[/tex]

Let's plug in the values and calculate q  for water:

[tex]q=(8.4g)(\frac{4.184J}{g.^0C})(32.1^0C)[/tex]

= 1128.17 J

Same amount of heat is lost by the metal. Mass of metal is 68.6 g.

[tex]\Delta T=100-52.1=47.9^0C[/tex]

let's plug in the values in the same formula and calculate the specific heat of metal:

[tex]1128.17J=(68.6g)(c)(47.9^0C)[/tex]

[tex]c=\frac{1128.17J}{(68.6g)(47.9^0C)}[/tex]

[tex]c=\frac{0.343J}{g.^0C}[/tex]

So, the right choice is B.0.343.

Answer:

B

Explanation:

Got it right on ODY(Oddesyware) ;) have an amazing day y'all

Kinetic energy has increased.

The Kinetic Molecular Theory of gases states that the average kinetic energy of the molecules of a gas is directly proportional to its Kelvin temperature.

Thus, if the temperature of the air in a room has increased, the average kinetic energy of its molecules has increased.

Initial pressure of the gas = 65.3 kPa  

Initial volume of the gas = 654 cm³

Initial temperature of the gas = 6⁰C = 273 + 6 = 279 K

Final pressure of the gas = 108.7 kPa

Final temperature of the gas = 4⁰C = 273 + 4 = 277 K

Using the combined gas law for ideal gases:

P₁V₁/T₁ = P₂V₂/T₂  

where P₁, V₁ and T₁ are the pressure, volume and temperature for the initial state and P₂, V₂ and T₂ are the pressure, volume and temperature for the final state.

Plugging the given data into the combined gas law we have,

(65.3 kPa x 654 cm³) / (279 K) = (108.7 kPa x V₂)/(277 K)

V₂ = (65.3 kPa x 654 cm³ x 277 K) / (279 K x 108.7 kPa)

V₂ = 390.1 cm³

Hey There!

Expand soluble ions to get complete ionic equation:

Sn²⁺(aq) + 2 NO³⁻(aq) +  2 K⁺(aq) + S²⁻(aq) :

SnS(s) + 2 K⁺(aq)  + 2 NO³⁻(aq)

Cancel common ions to get net ionic equation:

Sn²⁺(aq) + S²⁻(aq) => SnS(s)

Hope that  helps!

To obtain the whole ionic equation, expand the soluble ions:

Water molecules surround and solvate the ions, weakening the strong electrostatic interactions between them, which causes the ions to separate and spread equally throughout the solution when ionic compounds dissolve in it.

Equations become :

Sn²⁺(aq) + 2 NO³⁻(aq) +  2 K⁺(aq) + S²⁻(aq) :

SnS(s) + 2 K⁺(aq)  + 2 NO³⁻(aq)

To obtain the net ionic equation, eliminate common ions:

Sn²⁺(aq) + S²⁻(aq) => SnS(s)

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Answer: Option (B) is the correct answer.

Explanation:

An atoms consists of protons, neutrons and electrons. Protons are positively charged, neutrons have no charge and electrons are negatively charged.

Also, when an atom is neutral then there are equal number of protons and electrons.

For example, a neutral sodium atom has 11 protons and 11 electrons.

Therefore, we can conclude that modern atomic theory states that atoms are neutral as they have equal number of protons and electrons.