Most substances can exist as a gas, a liquid or a solid. These are called different ___ of matter.

water and carbon dioxide

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.

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[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 chemical formula is CF₂O.

Answer:

The chemical formula is [tex]CF_2O[/tex]

Explanation:

To determine how the molecule will be conformed you need to have in mind the valence number of each element present:

Now, as the only one positive, the C will be the central atom with a doble bond to the O and a single bond to each F.

In that way all atoms completed the octet and achive stability

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.

The correct explanation of how air exerts pressure on us is:

The molecules in the air located above us are pulled down towards the Earth by gravity, causing a downward pressure on objects below.

Numerous molecules that make up air are constantly moving. These air molecules are drawn downward toward the Earth's surface by the gravity of the planet. Because of this, the air above us has a weight that presses down on everything below it, including our bodies. Atmospheric pressure is the name given to this occurrence.

The other possibilities are not accurate ways to explain how air presses on us. The Earth's natural force acting on our bodies does not immediately pressurize the air. Our bodies' internal pressure regulation, not the air's outward pressure, is what determines how much air is present outside and inside of us. Moreover, the strength of the chemical connections that connect air molecules to our body's  molecules is not directly relevant to how air pressure is exerted on us.

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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

"You may find what you seek, or you might not" Is an excellent quote that might help.

"You may find what you seek, or you might not" Is an excellent quote that might help.

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]

If a decrease in temperature accompanies a reaction, Energy was absorbed.

So the forth option is correct option.

Explanation:

Immunoglobulin M is the first antibody produced on initial exposure to an antigen. It is also known as IgM.

It occurs as a primary response to the antigens against a particular baterium or virus. It is pentavalent in nature and has ten binding sites for antigens.

Therefore, it is concluded that when the body identifies a bacterium or a virus, it releases the antibody IgM.

Answer:

The first immunoglobulin to arrive is M, IgM

Explanation:

Immunoglobulins are the molecules that intervene in defense against microorganisms, foreign cells and against substances that can cause allergies. They are also known as antibodies. IgM is specific and is the first antibody that appears in primary infections, so its value and quantity is very important to diagnose an infection.

Answer:

1: C3H8

5: O2

3: CO2

4: H2O

Explanation:

The balanced equation for the given reaction is C[tex]_3[/tex]H[tex]_8[/tex] + 5O[tex]_2[/tex] → 3CO[tex]_2[/tex]+4H[tex]_2[/tex]O.  In other words, both mass and charge on the both side of the reaction are balanced.

A balanced equation indeed a chemical reaction equation in which the overall charge and the amount of atoms for every element inside the reaction are the same for both the products and reactants. In other words, both mass and charge on the both side of the reaction are balanced.

An imbalanced chemical equation describes the products and reactants of a chemical reaction however does not include the quantities needed to meet mass conservation. The balanced equation for the given reaction is C[tex]_3[/tex]H[tex]_8[/tex] + 5O[tex]_2[/tex] → 3CO[tex]_2[/tex]+4H[tex]_2[/tex]O.

Therefore, the balanced equation for the given reaction is C[tex]_3[/tex]H[tex]_8[/tex] + 5O[tex]_2[/tex] → 3CO[tex]_2[/tex]+4H[tex]_2[/tex]O.

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The mass number of an isotope is calculated by adding the number of protons and neutrons. In this case, an isotope of mercury has a mass number of 200 (80 protons + 120 neutrons).

The subject of your question is an isotope of mercury, which according to the information you provided, has 80 protons and 120 neutrons. In terms of nuclear structure, an isotope's mass number is the sum of its protons and neutrons. As such, if we add the number of protons (80) to the number of neutrons (120), we find that this isotope of mercury has a mass number of 200.

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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.

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

combustion is when you burn something in presence e of oxygen and the products will be mainly the CO2 and H2O

Answer: The given reaction represents a combustion reaction.

Explanation:

Decomposition reaction is defined as the chemical reaction in which a single substance breaks down into two or more simpler substances.

[tex]AB\rightarrow A+B[/tex]

Combination reaction is defined as the reaction in which two or more smaller substances combine to form a single large substance.

[tex]A+B\rightarrow AB[/tex]

Combustion reaction is defined as the reaction in which a hydrocarbon reacts with oxygen gas to produce carbon dioxide and water.

[tex]C_xH_y+O_2\rightarrow CO_2+H_2O[/tex]

A double displacement reaction is defined as the reaction in which exchange of ions takes place.

[tex]AB+CD\rightarrow AD+CB[/tex]

A single displacement reaction is defined as the reaction in which a more reactive element displaces a less reactive element from its chemical reaction.  The reactivity of metal is determined by a series known as reactivity series.

[tex]AB+C\rightarrow CB+A[/tex]

Metal C is more reactive than metal A.

For the given chemical reaction:

[tex]2C_2H_2+5O_2\rightarrow 4CO_2+2H_2O[/tex]

This is considered as a combustion reaction because ethene reacts with oxygen gas to produce carbon dioxide and water molecule.

The answer would be SOR.

A managed care plan is a type of insurance for health and there are three types: HMO; PPO; and POS.

HMO stands for Health Maintenance Organizations. This type of plan pays for the care provided within the network.

PPO stands for Preferred Provider Organizations. Typically, pays bigger if within the network, but also pays out even if care was provided outside the network.

POS stands for Point of Service lets you choose between HMO or PPO for every time you need health services/care.

Answer:

The answer would be SOR

Explanation:

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

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.

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

This polymer must D. be made of large molecules with repeating units.

A polymer consists of long chains of smaller repeating units called monomers.

For example, polyethylene consists of long chains of ethylene (CH₂=CH₂) units joined together end to end.

The formula for polyethylene is -CH₂CH₂-(CH₂CH₂)ₙ-CH₂CH₂-, where n is usually a number between 500 and 10 000.

There are 116 electrons in four atoms of Cu.

A Cu atom contains 29 protons, so it also contains 29 electrons.

[tex]\text{No. of electrons } = \text{ 4 Cu atoms } \times \frac{\text{29 electrons}}{\text{1 Cu atom }} = \text{ 116 electrons }\\[/tex]

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.

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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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: