what is this stone called? and false answers will be deleted. please help, i am making a pendulum

Answer:

There is only one formula to use and we should assume ideal gas. This equation is: PV=nRT. For the following questions manipulate this equation to get the answer.

1. n = PV/RT = (249*1000 Pa)(15.6 L)(1 m^3/1000 L)/(8.314 Pa-m^3/mol-K))(21+273) = 1.59 mol

2. P = nRT/V = (1.59)(8.314)(51+273)/(15.6/1000)(1000) = 274.55 kPa

3. Since the answer in #2 is more than 269 kPa, then the tires will likely burst. 4. Reduce pressure way below the limit 269 kPa.

Explanation:

Answer:

There is only one formula to use and we should assume ideal gas. This equation is: PV=nRT. For the following questions manipulate this equation to get the answer.

1. n = PV/RT = (249*1000 Pa)(15.6 L)(1 m^3/1000 L)/(8.314 Pa-m^3/mol-K))(21+273) = 1.59 mol

2. P = nRT/V = (1.59)(8.314)(51+273)/(15.6/1000)(1000) = 274.55 kPa

3. Since the answer in #2 is more than 269 kPa, then the tires will likely burst. 4. Reduce pressure way below the limit 269 kPa.

Explanation:

Explanation:

Most Americans have encountered some bacteria at some point in their lives, whether it was acquired from restaurant food or a grocery store, which caused them to claim they later had food poisoning. There are multiple nasty bacteria that can cause this, and there are many misconceptions about how they end up in our food, and what the best ways to avoid them are. To be forewarned is to be forearmed, so here are several misconceptions about food safety and the practices involved that can leave us satisfied, or ruin our day with stomach churning nastiness.

Answer:it decreases customer satisfaction

Explanation:

The land around a once active coal mine remains barren because empty coal mines are flooded with acid rain, so no life forms can survive. The correct option is a.

Coal mines are the places where coal is extracted from. Mines are the place where abundant minerals are present. These minerals are extracted from these places to use the minerals as fuel, making other metals and things. The three types of coal mines are long wall mining, retreat mining, and room-and-pillar mining.

Mines are places that are dig or excavated to very deep, so the topsoil goes into the valleys hence no nutrients in the soil, no plants, and no life.

Thus, the correct option is a.) Empty coal mines are flooded with acid rain, so no life forms can survive.

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Answer:

2

Explanation:

Answer:

Option C. Energy Profile D

Explanation:

Data obtained from the question include:

Enthalpy change ΔH = 89.4 KJ/mol.

Enthalpy change (ΔH) is simply defined as the difference between the heat of product (Hp) and the heat of reactant (Hr). Mathematically, it is expressed as:

Enthalpy change (ΔH) = Heat of product (Hp) – Heat of reactant (Hr)

ΔH = Hp – Hr

Note: If the enthalpy change (ΔH) is positive, it means that the product has a higher heat content than the reactant.

If the enthalpy change (ΔH) is negative, it means that the reactant has a higher heat content than the product.

Now, considering the question given, the enthalpy change (ΔH) is 89.4 KJ/mol and it is a positive number indicating that the heat content of the product is higher than the heat content of the reactant.

Therefore, Energy Profile D satisfy the enthalpy change (ΔH) for the formation of CS2 as it indicates that the heat content of product is higher than the heat content of the reactant.

Answer: 0.714 moles of [tex]PbI_2[/tex] will be produced from 237.1 g of potassium iodide

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]    

[tex]\text{Moles of potassium iodide}=\frac{237.1g}{166g/mol}=1.428moles[/tex]

The balanced chemical reaction is:

[tex]Pb(NO_3)_2+2KI\rightarrow PbI_2+2KNO_3[/tex]

According to stoichiometry :

2 moles of [tex]KI[/tex] produce =  1 mole of [tex]PbI_2[/tex]

Thus moles of [tex]KI[/tex] will require=[tex]\frac{1}{2}\times 1.428=0.714moles[/tex]  of [tex]PbI_2[/tex]

Thus 0.714 moles of [tex]PbI_2[/tex] will be produced from 237.1 g of potassium iodide

Answer:

A. Silver is a catalyst in this reaction.

Explanation:

The most common use of rare-earth metals is as catalysts in chemical reactions.

To solve such this we must know the concept of chemical reaction. Therefore, the correct option is option A that is  Silver is a catalyst in this reaction.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

A reaction between ethene and oxygen is used to produce epoxyethane. When silver is combined with ethene, the reaction for producing epoxyethane occurs much faster.  Silver is a catalyst in this reaction.

Therefore, the correct option is option A that is Silver is a catalyst in this reaction.

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Answer:

nucleophilic

Explanation:

Answer:

I think its nucleophilic.

Explanation:

Answer:

the tendency of some atoms in molecules to attract electrons more than their accompanying atom.

Explanation:

Answer:

NH3(g) + H2O(1) → NH4+(aq) + OH (aq)

HF(aq) + H2O(1) → H3O+(aq) + F (aq)

Explanation:

Acid-base reactions are chemical reactions involving acids and bases. Acids tend to ionize/dissociate in water, a property which determines their strength. Ionization of an acid refers to the acid losing its hydrogen ion (H+) in water solution. An acid ionizes or dissociates to form a conjugate base.

A strong acid is so because it ionizes completely in water i.e. loses all its hydrogen ion (H+) while a weak acid partially ionizes in water.

In the chemical reactions;

1) NH3(g) + H2O(1) → NH4+(aq) + OH (aq)

H20 loses its hydrogen ion (H+) in this reaction to form an anion (OH-). Hence, water (H20) is an acid in this case which ionizes to form a conjugate base (OH-). This is an example of ionization of acid.

2) HF(aq) + H2O(1) → H3O+(aq) + F (aq)

Hydrogen fluoride (HF) loses its hydrogen ion (H+) in the presence of water to form anion (F-). The HF is the acid while F- is it's conjugate base. Thus, an example of ionization of acid

Answer:

option c

Explanation:

Rate = k(A)¹(B)²

Answer:

c

Explanation:

a p e xxxxxxxxx

Answer:

C

Explanation:

For each reaction, compare molecules of reactant to molecules of product. Decrease entropy means I'm looking for the one that decreases.

Answer:

V. Combustion

Explanation:

Combustion is a reaction where a substance is burned - in this case, hydrogen is burned.

Answer:

5.65

Explanation:

Answer:

[tex]\boxed{\mathrm{Alkene}}[/tex]

Explanation:

The hydrocarbon shown has a double bond. Hydrocarbons with double bonds are known as alkenes.

Cyclic alkanes have cyclic structure.

Alkanes only have single bonds.

Alkynes have triple bonds.

Answer:

Alkene

Explanation:

A molecule having a double bond between its atoms is called an alkene.

Answer:

ca(s)+hcj(g)cacI 2 (s)+H2(g)

Explanation:

The equation below is balanced with the lowest possible whole-number coefficients, the sum of the coefficients Ca(s) + HCl(g) → CaCl2(s) + H2(g) is

ca(s)+hcj(g)cacI 2 (s)+H2(g).

The sum of the coefficients is 2+3+4+3=12.

Type of Chemical Reaction: For this reaction, we have a single displacement reaction. Balancing Strategies: In this reaction Calcium (Ca) metal is reacting with Hydrochloric acid (HCl). the Ca replaces the H in HCl and we end up with CaCl2 and H2.

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Answer:

B) Thomson's Model

Explanation:

Dalton's Model simply consisted of small spheres that represented atoms, and Bohr's model had a nucleus in the center with electrons orbiting in strict orbits, not randomly spread throughout. Thomson's plum pudding model, however, had an overall positively charged atom with many electrons spread throughout. If you search up "Plum Pudding Model" you can visually understand this.

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Answer:

[tex]\boxed{\sf D. \ [Ar] \ 3d5 \ 4s2}[/tex]

Explanation:

Manganese is a group 7 transition metal with an electronic configuration of [Ar] 3d5 4s2.

The atomic number of manganese (Mn) is 25. The electron configuration for manganese is  [Ar] [tex]\rm 3d^5 4s^2[/tex]. Therefore, the correct option is option D.

The electron configuration depicts how electrons are dispersed throughout an atom's energy levels and orbitals. Manganese (Mn) has an atomic number of 25, meaning that the atom contains 25 electrons. Manganese (Mn) has the following electron configuration: [tex]\rm 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^5[/tex]

We can use the noble gas notation to indicate the electron configuration in a more compact form by indicating the noble gas that comes before the electron configuration. The noble gas that comes before manganese (Mn) is argon (Ar), whose electron configuration is[tex]\rm 1s^2 2s^2 2p^6 3s^2 3p^6[/tex]. The electron configuration of manganese (Mn) can be expressed as [tex][Ar] 3d^5 4s^2[/tex] using noble gas notation.

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Answer: large rocks and debris on a slope

Explanation: Mass movement can simply be explained as the flow of earth materials down a slope. Movement of these materials such as rock particles , debris and soils are aid by the steepness of the slope or topography, wind or water moving down a slope at high speed and gravitational influence causing these particles to move down slope in the form of creep, landslide, slump or mudflow. When the slopes are covered with large rocks and debris, the occurrence of mass movement becomes imminent as these particles becomes unstable at slopes. Other influencing factor may include the movement of heavy wind or water down a slope or hill.

Answer:

O2(g) as a product

Explanation:

took the test

The substances which appear on the left hand side of the chemical equation are called the reactants and the products are on the right hand side. Here oxygen appears as a reactant in the final equation. The correct option is B.

A chemical equation in which the number of atoms of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation. A balanced equation obey the law of conservation of mass.

Here the given two equations are:

C (s) + 1/2 O₂(g) → CO (g)

CO (g) + 1/2 O₂(g) → CO₂ (g)

On adding the above two equations:

C (s) + O₂(g) → CO₂ (g)

So in the final chemical equation, oxygen appears on the reactant side. So oxygen is a reactant.

Thus the correct option is B.

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The given question is incomplete, most probably your full question was:

Consider the following intermediate chemical equations.

C (s) + 1/2 O₂(g) → CO (g)

CO (g) + 1/2 O₂(g) → CO₂ (g)

How will oxygen appear in the final chemical equation?

A. as a product

B. as a reactant

C. as a salt

D. as a mixture

Answer:

68.9 g of KCN.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

KCN + HCl → KCl + HCN

From the balanced equation above,

1 mole of KCN reacted with 1 mole of HCl.

Next, determination of the number of mole of KCN needed to react with 1.06 moles HCl.

This is illustrated below:

From the balanced equation above,

1 mole of KCN reacted with 1 mole of HCl.

Therefore, 1.06 moles of KCN will also react with 1.06 moles of HCl.

Finally, we shall convert 1.06 moles of KCN to grams.

This can be obtained as follow:

Molar mass of KCN = 39 + 12 + 14 = 65 g/mol.

Mole of KCN = 1.06 moles

Mass of KCN =...?

Mole = mass /Molar mass

1.06 = mass of KCN / 65

Cross multiply

Mass of KCN = 1.06 x 65

Mass of KCN = 68.9 g

Therefore, 68.9 g of KCN is needed to react with 1.06 moles of HCl.

Answer:

The two most basic types of bonds are characterized as either ionic or covalent. In ionic bonding, atoms transfer electrons to each other. ... In short, atoms with the same electronegativity share electrons in covalent bonds, because neither atom preferentially attracts or repels the shared electrons.

Hope this helps.....

Answer:

CaO

how:

since its an iconic compound (metal(Ca)+non-metal(O)=iconic(CaO) we have to take account the charges

so;

[tex]Ca^{+2}[/tex] [tex]O^{-2}[/tex]

now we will cross them

[tex]Ca_{2} O_{2}[/tex]

since both the values are same will cross it out.

hence: CaO

Answer:

A. 70.0 kpa

Explanation:

Given

Pressure = 525.4 torr

Required

Convert to kPa

From standard unit of conversion;

[tex]1\ torr = 0.133\ kPa[/tex]

Multiply both sides by 525.4

[tex]525.4 * 1\ torr = 525.4 * 0.133\ kpa[/tex]

[tex]525.4\ torr = 70.047572\ kpa[/tex]

[tex]525.4\ torr = 70.0\ kpa[/tex] (Approximated)

From the list of given options, option A is the closest answer after 525.4 torr is converted to its kpa equivalent

Answer: 13.60

Explanation:

[tex]\frac{10^{-14} }{4.0 x 10^{-} }[/tex] = 2.5 x10^-14  this =[tex][H_{3} O^{+} ][/tex]

pH = -log[tex][H_{3}O^{+} ][/tex]

pH= -log( 2.5 x10^-14) = 13.60

Answer:

C. Collisions of the right energy are more likely.

Explanation:

By increasing the concentration of reactants, a higher number of reacting molecules or ions are present in the reaction. This increases the chances of collisions occurring to increase the reaction rate.

Answer: C

Explanation:

collisions of the right energy are more likely

Answer:

3.07 L

Explanation:

This question describes Charles law, which shows the direct relationship of the absolute temperature to its volume when the pressure is kept constant. The Charles' law equation is:

V1/T1 = V2/T2

Where; V1 is the volume of the gas at an initial state

V2 is the volume of the gas at a final state

T1 is the absolute temperature of the gas at an initial state

T2 is the absolute temperature of the gas at a final state.

According to the question, V1 = 2.33L, V2 = ?, T1 = 10°C, T2 = 100°C

The absolute temperature unit, which is Kelvin, need to be used. Hence, we convert °C to Kelvin using:

T(K) = T(°C) + 273.15

T1 (K) = 10°C + 273.15 = 283.15K

T2 (K) = 100°C + 273.15 = 373.15K

To solve for V2 in the above Charles law equation, we make V2 the subject of the formula by saying:

V2 = V1 × T2 / T1

V2 = 2.33 × 373.15 / 283.15

V2 = 869.4395/ 283.15

V2 = 3.0705

Hence, the gas will be expanded to a volume of 3.07L when heated from 10.0°C to 100.0°C.

Explanation:

warm honey easier to pour than cold honey due to Increasing the temperature converts the sugars into water, which flows easier.

Honey contains sugar,  water  and other ingredients, where Sugar gives  gives sweetness, water maintain fluidity, and other components are present in a least amount and the differences are the color, aroma and taste.

Three types of sugar such as fructose (41%), grape sugar  or glucose about 34%  and sucrose contain 1 and 2%, other components include  minerals, proteins, acids and undetermined matter.

Minerals constitute 3.68%, increase the value of honey for human consumption and the most common minerals are potassium, chlorine, sulfur, calcium, sodium, phosphorus, magnesium, silicon, iron, manganese and copper.

Proteins are collected from nectar and pollen  which is the integral parts of plants, acids are also the component,  vitamn C and some B complex vitamins  such as riboflavin, pantothenic acid, pyridoxine, biotin, nicotinic acid are present.

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Answer:

D Na+

Explanation:

due to shielding effect

Answer:good luck!

Explanation: