Why do you think scientist can use the basic properties of matter to help identify an unknown substance?

Frequency of photon = is 6.85 X 10¹⁴ sec⁻¹

Energy of photon , E = hv

where h is Planck's constant, v is the frequency of photon

E = 6.63 × 10⁻³⁴ J.s x 6.85 X 10¹⁴ s⁻¹

E = 4.54 x 10⁻¹⁹ J

Therefore, the energy of a photon of green light is 4.54 x 10⁻¹⁹ J.

[tex]c = 3.2 \; \text{J} \cdot \text{kg}^{-1} \cdot \text{K}^{-1}[/tex]

Heat capacity measures the energy required to raise the temperature of a unit mass of a substance by a unit degree. Therefore

[tex]c = Q / (m \cdot \Delta T) = 56/(11 \times (12 - 10.4)) = 3.2 \; \text{J} \cdot \text{kg}^{-1} \cdot \text{K}^{-1}[/tex]

Answer : The heat capacity of liquid will be, [tex]3.18J/g^oC[/tex]

Explanation :

Formula used :

[tex]Q=m\times c\times \Delta T\\\\Q=m\times c\times (T_2-T_1)[/tex]

where,

Q = heat absorb = 56 J

m = mass of liquid = 11 g

c = specific heat of liquid = ?

[tex]\Delta T[/tex] = change in temperature

[tex]T_1[/tex] = initial temperature = [tex]10.4^oC[/tex]

[tex]T_2[/tex] = final temperature = [tex]12^oC[/tex]

Now put all the given value in the above formula, we get:

[tex]56J=11g\times c\times (12-10.4)^oC[/tex]

[tex]c=3.18J/g^oC[/tex]

Therefore, the heat capacity of liquid will be, [tex]3.18J/g^oC[/tex]

the general principle or theory is probably false

Mercury is different from the Earth for the following reasons:

Mercury has no moon and hot surface temperatures.

Mercury is the smallest planet and the first planet from the sun. Mercury has no atmosphere. The surface temperature of Mercury is incredibly hot, the side of the planet facing the sun has a temperature of 800 degrees F.

Mercury and the earth are the planets of the solar system. Mercury has no moon and has a hot surface temperature. Thus, options b and d are correct.

A planet is a celestial body that revolves around the sun and rotates on its axis in its orbitals. They are different from fixed stars like the sun and moon in having movements. Mercury is the first and the closest planet to the sun.

Being closest to the sun it has more surface temperature than earth and is very small. It lacks an atmosphere as compared to earth and has no natural satellite like the moon that revolves around it.

Therefore, mercury lacks a moon and has a high surface temperature.

Learn more about mercury here:

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Hi Khal75,

Experiment: How to seperate iron fillings

Iron fillings is a substance that attracts to magnets.

Answer - Separated using a magnet; magnetism

If you move a magnet around different solids with the iron fillings in it, it wil attract the iron to be able to seperate it.

water and carbon dioxide

A) 1s2 2s1

The alkali metals have one lone outer S electron, because of this we can clearly see that the answer is 1s2 2s1

Answer:

1s2 2s2 2p6 3s2 3p6 4s2

Orange juice with pulp is the correct answer because it is a heterogeneous mixture with suspended particles that can be separated by filtration.

The question asks to identify which of the four liquids listed is a mixture that can be separated by filtration. Among the options provided:

Therefore, the liquid that is a mixture and can have some of its parts separated by filtration is orange juice with pulp.

Answer:

all of these        

Answer:

all of these    

Explanation:

The abundance of carbon-13 is needed to solve this problem, which involves multiplying the atomic mass of carbon-13 by its abundance. Without knowing the abundance, we can't do this operation.

The implicit part of this problem is the information on the abundance of carbon-13 (13C). Unfortunately, without this information, we can't execute this operation. Typically, abundance percentages are given for isotopes while referring to atomic mass or atomic masses in relation to relative abundance. You would multiply the atomic mass of 13C, which is 13.003355, by its abundance (expressed as a decimal and not a percentage) to get the intended result. For instance, if the abundance of carbon-13 was 10%, it would be represented as 0.10, and the multiplication operation would be 13.003355 * 0.10.

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Answer:- 12.7%

Solution:- It says, ammonium phosphate is 60.9%. It means if we assume 100 g of the sample then there is 60.9 g ammonium phosphate in it.

Formula of ammonium phosphate is [tex](NH_4)_3PO4[/tex] and it's molecular weight is 149 grams per mol. There is only one P in the formula and so the mass of P in 149 g of ammonium phosphate is 31 g(atomic mass of P).

Now, we could use the proportions to find out the mass percentage of P in the sample.

31 g P is present in 149 g of ammonium phosphate, how many grams of P would be present in 60.9 g of ammonium phosphate. Let's set the proportions as:

[tex]\frac{31}{149}=\frac{x}{60.9}[/tex]

[tex]x=\frac{31(60.9)}{149}[/tex]

[tex]x=12.7[/tex]

This 12.7 g of phosphorous is present in 100 g of the sample means there is 12.7% phosphorous in the sample.

The formula is molarity (M) = moles / liters

molarity (M) = ?

1/ mass = 36.52 g of KCl (you need to find the mole)

mole = mass / Molar mass

Molar mass of KCl:

K = 39.10 g/mol

Cl = 35.45 g/mol

Add K and Cl together: 39.10 + 35.45 = 74.55 g/mol

mole = 36.52 g of KCl / 74.55 g/mol

mole = 0.489 mol of KCl

2/ Volume = 820 mL ( you need to convert to L)

820 / 1000 = 0.82 L

=> M = mol / L

    M = 0.489 mol / 0.82 L

    M = 0.59 mol/L

Hope this help!

Answer: 0.27 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]

where,

n = moles of solute

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{36.52g}{166g/mol}=0.22moles[/tex]

[tex]V_s[/tex] =volume of solution in ml

Molarity =[tex]\frac{0.22\times 1000}{820ml}=0.27M[/tex]

The molarity of the solution is 0.27 M.

AS given that we have started with a solid powder on a glass plate which appears to be blackish yellow, on passing magnet the black particles separated.

so the black particles are magentic in nature. however the yellow portion of powder is not magnetic or diamagnetic

so its clear that we are able to separate the black and yellow portions by simple physical methods.

If we are able to separate any two substances by simple physical methods then it means that the powder is a mixture and not a compount

Answer. By adding the proportionality constant .

Explanation:

suppose 'x' a  is directly proportional to the 'y' , where x and y are variables:

x ∝ y

with an input of constant value 'K' proportionality relation gets converted into  an equation:

x = K y

For example : Gravitational force is directly proportional to the product of two masses and inversely proportional to the square of the distance between the two masses.

F ∝ [tex]\frac {m_1m_2}{r^{2}}[/tex]

To convert this proportionality relation constant 'G'  was introduced known as gravitational constant whose value remains constant under every conditions.

[tex]F=\frac {G\times m_1m_2}{r^{2}}[/tex]

[tex]G=6.67408\times 10^{-11}m^3Kg^{-1}s^{-2}[/tex]

Classify each of the following materials as a pure substance or mixture. If it is a pure substance, indicate if it is an element or a compound. If it is a mixture, indicate if it is a homogeneous mixture or heterogeneous. (2 points each)

Questions

1.  

The copper in a copper wire  pure

2.

Gatorade  heterogeneous

3.  

Chocolate chip ice cream    heterogeneous

4.  

Sugar (C12H22O11)   pure

5.  

Glitter nail polish   heterogeneous

6.

Diamond (C)   pure

7.  

Salt (NaCl)  pure

8.  

Air  homo

9.  

Helium gas  pure

10.  

Carbon dioxide gas  pure

11.

Coffee  depends on being black and unsaturated

12.  

Caffeine (C8H10N4O2)   pure

13.  

Tomato soup  heterogeneous

14.

Chicken noodle soup heterogeneous

15.  

Brass  homo

16.  

Pure water  pure

17.  

Pure iron  pure

18.  

Sweat  homo

19.  

Baking soda (NaHCO3)  pure

Final answer:

Detailed classification of substances as pure substances or mixtures, elements or compounds, and homogeneous or heterogeneous mixtures.

Explanation:

A pure substance either consists of a single type of atom, an element, or of molecules made from atoms of two or more types bound together, known as compounds. Mixtures can be either homogeneous, where the composition is consistent throughout, or heterogeneous, where the substances that make up the mixture are not evenly distributed. The items can be classified as -

1. The copper in a copper wire: Pure substance - Element

2. Gatorade: Mixture - Homogeneous

3. Chocolate chip ice cream: Mixture - Heterogeneous

4. Sugar (C12H22O11): Pure substance - Compound

5. Glitter nail polish: Mixture - Heterogeneous

6. Diamond (C): Pure substance - Element

7. Salt (NaCl): Pure substance - Compound

8. Air: Mixture - Homogeneous

9. Helium gas: Pure substance - Element

10. Carbon dioxide gas: Pure substance - Compound

11. Coffee: Mixture - Homogeneous

12. Caffeine (C8H10N4O2): Pure substance - Compound

13. Tomato soup: Mixture - Homogeneous

14. Chicken noodle soup: Mixture - Heterogeneous

15. Brass: Mixture - Homogeneous

16. Pure water: Pure substance - Compound

17. Pure iron: Pure substance - Element

18. Sweat: Mixture - Homogeneous

19. Baking soda (NaHCO3): Pure substance - Compound

The answer to the first one is C. Strong attraction between ions

The answer to the second one is A. High melting points

Hope this helps :)

Answer: 1) C. Strong attraction between ions.

2) A. High melting points

Explanation: Ionic compounds are formed by combination of positively charged ions called cations formed by less electronegative metals and negatively charged ions called anions formed by more electronegative nonmetals.

The cations and anions with opposite charges are bonded through  strong coloumbic forces and thus are difficult to break and have high melting points and thus exist as solids at room temperature.

[tex]Na:11:[Ne]3s^1[/tex]

[tex]Na^+:10:[Ne][/tex]

[tex]Cl:17:[Ne]3s^23p^5[/tex]

[tex]Cl^-:18:[Ne]3s^23p^6[/tex]

[tex]Na^++Cl^-\rightarrow NaCl[/tex]

Answer:  C. atoms must be small.

Explanation:  Hydrogen bond is the result of the electrostatic forces of attraction between the hydrogen and the electonegative atom. It is a type of dipole dipole interaction which is not so much of a covalent bond.

The options A, B and D satisfies the definition of the hydrogen bonding but the option C seems to be irrelevant as hydrogen bonding does not deal with the size of the atom.

Thus for the hydrogen bonding , the other atom must be electronegative, and atoms must have atleast one lone pair of electrons and atoms must not be able to closely approach the hydrogen.

Explanation:

A property that does no change the chemical composition of a substance are known as physical properties.

For example, mass, volume, size etc are all physical properties.

Whereas a property that changes the chemical composition of a substance are known as chemical properties.

For example, reactivity, toxicity etc are all chemical properties.

Therefore, identifying the given statements as follows.

Answer:

The various components of a mixture do not combine chemically - physical property.

Chemical properties can only be observed during a chemical reaction - chemical property.

The rusting of iron is a chemical reaction - chemical property.

Melting and boiling points are physical properties - physical property.

Explanation:

Answer:They exist at specific energy levels.

Explanation:

The correct answer is: by the transfer of one or more electrons from one atom to another.