Carol placed a lid over a pot of boiling water. After five minutes, she removed the lid and noticed water drops had formed all over the lid's inner surface. Which statement describes the change in the water vapor molecules as they changed to liquid?

Hello!

To find the number of atoms in 2.822 moles of nickel, we need to multiply it by Avogadro's number. Avogadro's number is 6.02 x 10^23 atoms.

2.822 moles x (6.02 x 10^23) ≈ 1.698844 x 10^24

Therefore, there are about 1.70 x 10^24 atoms (according to the number of significant figures) in 2.822 moles of nickel.

"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.

Two physical changes is:

• Breaking

• Boiling

Two chemical changes could be:

• Molecules rearranging with other molecules to make new substance

• Bubbling/fizzing

Answer: A.  NO increases the rate at which [tex]SO_3[/tex] molecules are formed.

Explanation: The catalyst makes it possible for the reaction to take place by another path that makes possible reaction at a lower energy.

Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.

A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more reactants [tex](SO_2)[/tex] and [tex](O_2)[/tex] undergo collision and can cross the energy barrier and convert to products [tex](SO_3)[/tex]

Thus NO increases the rate at which [tex]SO_3[/tex] molecules are formed.

Answer:

The answer above is correct

A.  NO increases the rate at which  molecules are formed.

Explanation:

Answer:  0.5 kilograms

Explanation:

One kilogram is equal to a thousand grams.

Supposing x to be the number of kilograms equal to 527 grams, we can write it as:

1 kg = 1000 grams

x kg = 527 grams

To solve for x, we can simply divide 527 grams by 1000 thousand grams to get the answer.

x = 527 / 1000

x = 0.527

Rounding this value to the nearest tenth, it will become 0.5 kilograms.

Given data:

Mass in grams = 527 g

Mass in kilograms = ?

Solution:

1 kilogram=1,000 grams

1 gram = 1/1000 kilograms

527 gram = 1/1000 * 527

527 grams = 0.527 kilogram

Round of answer: 00.5 kg

You get 0.54 but the calculated answer is 0.572.

So without round off you are wrong.

With round off you are correct.

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]

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.

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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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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[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]

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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a i took this test yesterday.

Answer: Organelles

Explanation:

The cell organelles are the basic structure that is present inside every cell which helps the cell to perform its survival activities and processes.

The various types of organelles in the cell helps in performing various functions. Such as the mitochondria helps in the conversion of carbohydrates into adenosine triphosphate.

The Golgi body in the cell helps in the sorting and modification of proteins. It helps in the transport the secretion of the cells after modifications.

Hence, the correct answer is Organelles.

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.

They can use the properties to test and come to some kind of conslusion about the object because in some way it's gotta correlate back to one of the different properties of matter.

1) Answer is: O and P.

Electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

Oxygen (O) has greater electronegativity than phosphorus (P), because of that oxygen is partially negative and phosporus is partially positive.

Polyatomic ion is for example a molecule that has been ionized by gaining or losing electrons.

Oxygen and phosphorus can form ion PO₄³⁻.

2) Answer is: Cs and I.

Cesium (Cs) and iodine form salt cesium iodide (CsI) with ionic bond.

Ionic bond is the electrostatic attraction between oppositely charged ions (cations and anions).

Cesium (metal) lost one electron and form cation Cs⁺; iodine (nonmetal) gain one electron and form anion I⁻.

3) Answer is: KCl.

Potassium chloride is a salt with ionic bond.

Substances with ionic bond conduct an electric current in liquid and aqueous solutions, but not in solid state, because in liquids ions are mobile, contrary to solids where ions are fixed.

Dissociation of potassium chloride in water: KCl(aq) → K⁺(aq) + Cl⁻(aq).

4) Answer is: metal cation + nonmetal anion(–ide).

Name of this compound is calcium chloride.

Calcium chloride is a inorganic salt with ionic bonds between calcium and chlorine. It is a colorless crystalline solid at room temperature, highly soluble in water.

Calcium has oxidation number +2 and chlorine has oxidation number -2.

5) Answer is: AlCl₃.

Balanced chemical reaction: 2Al(s) + 3Cl₂(g) → 2AlCl₃(s).

Aluminium chloride is a salt with ionic bonds.

Aluminium (metal from group 13) has oxidation number +3 and chlorine (nonmetal from group 17) has oxidation number -1, chemical compound has neutral charge (+3 + 3 · (-1) = 0).

6) Answer is: carbon.

In molecule of methane (CH₄) all the atoms around the central element (carbon) are equivalent (four hydrogens) and it has a net dipole moment of 0 (vectors of dipole moments cancel each other, dipole moment is zero).

Methane (CH₄) is gaseous molecule with tetrahedrale structure, carbon is sp3 hybridized.

7) Answer is: Sodium chloride has a higher boiling point than sucrose.

Sodium chloride (NaCl) has ionic bonds and sucrose (C₁₂O₂₂O₁₁) has covalent bonds.

Sucrose or table sugar (C₁₂O₂₂O₁₁) composed of two monosaccharides. Monosaccharides glucose and fructose are linked with an ether bond between C1 on the glucosyl subunit and C2 on the fructosyl unit.

Boiling point of sodium chloride is 1413°C and sucrose decomposes at 186°C and form caramel.

8) Answer is:  It is a salt of three polyatomic ammonium ions and one polyatomic phosphate ion.

Polyatomic ammonium cation has charge of +1 and polyatomic phosphate anion has charge -3.

Ammounium ion is polyatomic because it is composed of one nitrogen and four hydrogen atoms.

Phospate anion is polyatomic because it is composed of one phosphorus and four oxygen atoms.

9) Answer is: S and O.

Electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

Oxygen (O) has greater electronegativity than sulfur (S), oxygen is partially negative and sulfur is partially positive.

Sulfur and oxygen can form, for example, SO₃²⁻ (sulfite anion) or SO₄²⁻ (sulfate anion).

10) Answer is: manganese(II) phosphate.

Manganese (II) phosphate (Mn₃(PO₄)₂) is an ionic salt.

Manganese has oxidation number +2 and phosphate has charge -3.

3 · (+2) + 2 · (-3) = 0; chemical compound has neutral charge.

Formula for manganese(III) phosphate  is MnPO₄.

Formula for manganese(I) phosphate  is Mn₃PO₄.

The volume of the cube in mL is 10.684 mL

We know that the volume of a cube with length of sides L is V = L³

Since the length of side of our cube is 2.20 cm, its volume V = L³ = (2.20 cm)³ = 10.648 cm³.

Since 1 dm³ = 1 liter and 1000 cm³ = 1 dm³, we convert the volume of the cube to dm³.

So, 10.684 cm³ = 10.684 cm³ × 1 dm³/1000 cm³ = 0.010684 dm³

Since 1 dm³ = 1 L,

0.010684 dm³ = 0.010684 L

We now convert this volume of the cube to milliliter(mL)

Since 1000 mL = 1 L.

0.010684 L = 0.010684 × 1 L = 0.010684 × 1000 mL = 10.684 mL

So, the volume of the cube in mL is 10.684 mL

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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:

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.

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.

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

So the forth option is correct option.

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

Answer:- 1.8 L

Solution:- The given volume is 1838 mililiters and we are asked to convert it to liters. We know that:

[tex]1mL=(\frac{1}{1000})L[/tex]

Where, mL stands for mililiters and L stands for liters.

Let's make the set up using this conversion factor to convert the given mL to L.

[tex]1838mL(\frac{1L}{1000mL})[/tex]

= 1.838 L

They asks to round the answer to the nearest tenth. So, it becomes 1.8 L.

Answer:

Option d, 1s2 2s2 2p6 3s2 3p6 4s2

Explanation:

Alkaline earth metals belong to group 2 of the periodic table. Elements belonging to group 2 are beryllium, magnesium, calcium, strontium and barium and radium.

Alkaline earth metals have 2 valence electrons and these two electrons are filled in outermost s sub shell.

General electronic configuration of alkaline earth metal: ns^2

In ionized state, number of electrons in s sub shell will not be 2.

Among the given, only 1s2 2s2 2p6 3s2 3p6 4s2, has 2 electrons in s sub shell. So, it an electronic configuration of neutral alkaline earth metal.

The correct answer to the question is Option D. 1s² 2s²2p⁶ 3s²3p⁶ 4s²

Alkaline earth metals are metals belonging to the group 2 of the periodic table.

They have 2 valence electrons.

Now, we shall determine which of the option given above that has  valency of 2 electrons

1s² 2s¹

Valence electron shell = 2s¹

1s² 2s²2p²

Valence electron shell = 2s²2p²

Valence electron = 2 + 2

1s² 2s²2p⁶ 3s¹

Valence electron shell = 3s¹

1s² 2s²2p⁶ 3s²3p⁶ 4s²

Valence electron shell = 4s²

From the illustraton made above, we can see that only Option D has a valence electron of 2.

Therefore, the correct answer to the question is Option D. 1s² 2s²2p⁶ 3s²3p⁶ 4s²

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Answer:

D. Crust, as its depth is less than 100 kilometers

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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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]

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