1. What are physical and chemical properties of metals, nonmetals, and metalloids?​

Answer:

option first is the right answer

Answer:

V₂ = 46.34 mL

Explanation:

Given data:

Initial temperature = 273 K

Initial volume = 50.0 mL

Final temperature = 253 K

Final volume = ?

Solution:

The given problem will be solve through the Charles Law.

Charles Law

"The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure"

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

by putting values in formula,

V₁/T₁ = V₂/T₂

V₂ = V₁T₂/T₁  

V₂ = 50.0 mL × 253 K / 273 k

V₂ = 12650 mL.K / 273 K

V₂ = 46.34mL

The no. of moles and mass of zn determines to be in the titration sample of zinc chloride be less than the original value. correct option is (A).

Percentage error = (experimental value / theoretical value) * 100

So experimental value is always less than that of the theoretical value

b. Higher mole of Cl than the true value

A smaller volume would lead to a smaller mol amount of Cl being calculated. Thus higher than the true value volume recording.

c. The ratio of zinc to chloride would decrease.

A higher number of Cl moles would lead to higher whole number when divided by the number of Zn moles. Thus, the ratio would have a larger denominator equals smaller ratio.

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Answer:

MOON

Explanation:

ITS PERIOD OF REVOLUTION IS EQUAL TO PERIOD OF ROTATION

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Answer:

They move freely between the clouds of several atoms, si the correcto Answer is D

Explanation:

Hope this helps.

Answer:

1 mole represents 6.023×1023 particles.

1 mole of iodine atom= 6.023×1023

Given 127.0g of iodine.

no. of iodine atom = 1 mole of iodine

1mole of magnesium = 24g of Mg = 6.023×1023no.of Mg

Given 48g of Mg = 2×6.023×1023

no. of Mg = 2 moles of Mg

1 mole of chlorine atom= 6.023× 1023

no. of chlorine atom = 35.5g of chlorine atom

Given 71g of chlorine atom=2× 6.023× 1023

no. of chlorine atom = 6.023×1023

2 moles of chlorine atom.

Given that 4g of hydrogen atom.

will be equal to 4 × 6.023 × 1023

no. of atoms of hydrogen= 4 moles of hydrogen atom.

According to the graph, only the reactant A was present at the beginning of the reaction.

The graph shows the concentration for the reactant A and the product that is A2. In this graph, the concentration is displayed on the vertical axis, while the horizontal axis shows the time.

In general terms, it can be observed that at the beginning only the reactant A is present, but as the reaction occurs the concentration of this reactant decreases, while the concentration of the product A2 increases.

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If the mixture is made of 41.37 percent a and 58.63 percent by volume, then the density of the object is calculated as  1.9302 g/mL.

Density is a mass of a unit volume of a material substance. It is commonly expressed in units of grams per cubic centimeter.

Given, vA = 413.7 mL  and  vB = 586.3 mL

total (A+B) density = mass AB / volume AB

As,  mAB = mA + mB

mA = vA * dA = 413.7 mL * 2.0514 g/mL

= 848.664 g A

mB = vB * dB = 586.3 mL * 2.6678 g/mL

= 1564.13 g B

Hence, mAB = 2412.795 g AB

total density = 2412.795 g / 1000 mL = 2.4127 g/mL AB

Use principle of Archimedes' to find the density of a solid suspended in a liquid:

E = dAB * g * Vs

Vs is submerged solid volume; E : fluid weight displaced by the solid

and dAB : mix density ; g : gravity

As, ∑F = 0

E - Wsolid = 0

Hence, E = Wsolid

∴ Wsolid = msolid * g

Now, msolid * g = dAB * g * Vs

msolid = dsolid * Vs

So, msolid = dsolid * Vsolid

Assuming that 80% of solid is submerged in mixture, we have: Vs = 0.8 * Vsolid

Then, dsolid * Vsolid = dAB * 0.8 * Vsolid

dsolid = dAB * o.8

dsolid = 2.4127 g/mL * 0.8

So, dsolid = 1.9302 g/mL

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Answer:

Water molecules' adhesion aids plants in moisture absorption at their roots. Water's initial boiling point is attributed to cohesion, which helps animals regulate their body temperature.

Explanation:

Answer:

3.96 × 10⁻³ mol Pb

Explanation:

Step 1: Find molar mass

Pb (Lead) - 207.2 g/mol

Step 2: Use Dimensional Analysis

\(0.821 \hspace{2} g \hspace{2} Pb(\frac{1 \hspace{2} mol \hspace{2} Pb}{207.2 \hspace{2} g \hspace{2} Pb} )\) = 0.003962 mol Pb

Step 3: Simplify

We have 3 sig figs

0.003962 mol Pb ≈ 0.00396 mol Pb

0.00396 mol Pb = 3.96 × 10⁻³ mol Pb

Answer:

The nucleus contains protons and neutrons. Protons have a positive charge and neutrons have no charge. Therefore, the overall charge of the nucleus is positive. Remember that electrons (particles with negative charges are located outside of the nucleus, in the electron clouds).

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The nucleus of an atom consists of protons and neutrons. The proton has a  positive charge (+1) while the neutron is neutral (0). This makes the charge of the nucleus overall positive.

Provider Information is not required (for secondary containers used in the workplace) on a hazardous material label.

The following components need to be on a label to be GHS compliant:

Identification of the product

warning or danger as a signal word

Risk pictograms

Advisory statements

Statements of caution

Provider Information (not required for secondary containers used in the workplace)

If the primary container fails, secondary containment acts as a backup barrier to prevent leaking into an exposed area. It is necessary to store all containers of hazardous waste and liquid hazardous materials in an appropriate secondary containment system. Systems for secondary containment may include

What information must be on labels for chemicals used at work?

The warning or signal phrase "Danger," "Warning" pictograms, "Hazmat" or "Precautionary" remarks, and "Product" and "Supplier" identification signs (supplier identification is not required for secondary containers used in the workplace)

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Answer:

BARIUM HYDROXIDE IS THE COMPOUND

Answer:

the molecular formula of Ozone is O_3.

Answer: O₃

Explanation:

The chemical formula of ozone is O3. In the earth's stratosphere, ozone is formed from a two-step reactive process. First, sunlight breaks apart an oxygen molecule (O2 you'll recall) into two oxygen atoms. In the second step, these oxygen atoms collide with another oxygen atom to make ozone.

Answer:

V₂ = 545.79 mL

Explanation:

Given data:

Initial volume = 1000 mL

Initial pressure = 1 atm

Initial temperature = 273 K

Final temperature = 298 K

Final volume = ?

Final pressure = 2 atm

Formula:  

P₁V₁/T₁ = P₂V₂/T₂  

P₁ = Initial pressure

V₁ = Initial volume

T₁ = Initial temperature

P₂ = Final pressure

V₂ = Final volume

T₂ = Final temperature

Solution:

V₂ = P₁V₁ T₂/ T₁ P₂  

V₂ = 1 atm × 1000 mL × 298 K / 273 K × 2 atm

V₂ = 298000 atm .mL. K / 546 K.atm

V₂ = 545.79 mL

Answer:

52

Explanation:

This is because if R is the midpoint of FRG, FR is half of FRG, so basically all you do it multiply by 2 to get the FRG

The percent by mass of acetic acid in the vinegar is 2.33%.

Below are the steps to solve the given problem using the data table given below:

Step 1: Calculate the mass of the vinegar. Given,Mass of flask and vinegar solution- 25.17gMass of flask- 15.12gMass of vinegar solution = Mass of flask and vinegar solution - Mass of flask= 25.17 g - 15.12 g= 10.05 g

Step 2: Calculate the moles of NaOH used in the titration.Molarity of NaOH solution is 0.1 M.Moles of NaOH = Molarity × Volume of NaOH usedMoles of NaOH = 0.1 M × 39.00 mL (since the initial volume of NaOH is 0.00 mL)Moles of NaOH = 0.0039 moles

Step 3: Determine the moles of acetic acid used in the reaction.The balanced chemical equation for the reaction between NaOH and acetic acid (the main component of vinegar) is given below:CH3COOH + NaOH → CH3COONa + H2OMoles of NaOH = Moles of CH3COOH (since they react in a 1:1 ratio)Moles of CH3COOH = 0.0039 moles

Step 4: Calculate the mass of acetic acid used in the reaction.Molar mass of acetic acid is 60.05 g/mol.Mass of CH3COOH = Moles of CH3COOH × Molar mass of CH3COOH= 0.0039 moles × 60.05 g/mol= 0.234 gStep 5: Calculate the percent by mass of acetic acid in the vinegar.Percent by mass of acetic acid = (Mass of CH3COOH / Mass of vinegar solution) × 100%= (0.234 g / 10.05 g) × 100%= 2.33%.

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Answer:

4 hours,19 minutes,60 seconda

Explanation:

just add everything up

This problem is describing a mixture composed by diethyl ether and actic acid, in which it is desired to extract the latter somehow.

In this case, it turns out relevant to recall the concept of polarity, hydrogen bonds, and, in general, intermolecular forces. Acetic acid is a highly polar compound, able to have both dipole and hydrogen-bonding interactions, which are by far stronger than nonpolar-based London dispersion forces.

In such a way, since diethyl ether and actic acid are able to interact via dipole-dipole interactions, they latter is able to be dissolved in the former; however, when it is desired to extract the acid, it would be necessary to add a substance able to form H-bonds with acetic acid, which are stronger than the dipole interactions.

Therefore, the best solvent for this extraction will be water due to its higher polarity and superior capacity to form H-bonds.

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Taking into account the definition of calorimetry and sensible heat, the heat added to the system is 331.2 cal.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this way, between heat and temperature there is a direct proportional relationship.

In this case, you know:

Replacing in the expression to calculate heat exchanges:

Q= 0.23 \(\frac{cal}{gC}\)× 24 g× 60 C

Solving:

Q= 331.2 cal

In summary, the heat added to the system is 331.2 cal.

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Answer:

gas and element and compound

Explanation:

because it's different and more power so the elements

Answer:

Let's start with the fact that cereals , are made of grains and are mostly carbohydrates. therefore they contain carbon oxygen and hydrogen. They also contain proteins so have nitrogen. Plants have the minerals that are in the soil where they grow, so the list you have is correct. They also generally have added vitamins ad minerals. The vitamins contain C, H, O N, and a few others such as sulfur, The added minerals might contain:copper, iron, zinc, cobalt, selenium, silicon and molybdenum .

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The three elements present in the ingredients of the cereal drink which are not listed in the nutrition facts are Iron, Calcium, and Zinc

Cereals are monocotyledonous grass crops cultivated annually for the purpose of consumption. They are rich in fiber and energy. Examples of them include;

Cereal drinks are processed drinks extracted from cereal crops through fermentation. They are rich in nutrients as they contain important sources of carbohydrates, dietary protein, and vitamins.

The ingredients present in a cereal drink are composed of essential elements such as:

Some of which are not listed in the nutrition facts are Iron, Calcium, and Zinc.

Therefore, we can conclude that the elements present in the ingredients of the cereal drink which are not listed in the nutrition facts can be Iron, Calcium, and Zinc.

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A stair step is approximately 7 inches, or 0.58 feet, tall on average. A total height of approximately 5.8 feet can be obtained by multiplying by 10 steps.

The term "height" typically refers to the distance that separates a person or an object's bottom from its top. Height can be measured from an object's base to its highest point, whereas in the context of a person, it is typically measured from the bottom of their feet to the top of their head. Common measurements of height include meters, feet, inches, and centimeters. It is an important physical trait that can have an impact on a person's health, appearance, and ability to participate in certain activities, among other things.

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The electronegativitie of the period-3 element are lited on the tranparency.. Si and Cl  is 0.7, . Mg and S is 1.3,  Si and S is 1.7, Al and P is 1.6.

The electronegativity of the atoms that make up the bond determines whether it is nonpolar or polar covalent. An atom's propensity to draw electrons (or electron density) in its direction is measured by its electronegativity. It controls how the shared electrons between the two atoms in a bond are distributed. The more an atom's electronegativity, the more strongly the electrons in its bonds are drawn to it. In a polar covalent bond, electrons are pushed in the direction of the more electronegative atom; as a result, the atom with the partial negative charge is the more electronegative atom. The electron distribution becomes increasingly polarised and the atoms' partial charges increase with increasing electronegativity differences.

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A commercial formula called concentrate needs to be diluted with water and formula in an identical ratio.

Infant formulae with added iron are advised, and the majority of commercial infant formulas sold in the US do so. Both liquid and powdered infant feeds are commercially available. Three types of infant formula are available: Before feeding, the powder needs to be dissolved in water. A similar amount of water must be added to the liquid concentrate before feeding. Ready-to-feed – Does not require mixing. (40 Cal/30 mL) Concentrated Liquid A standard dilution is one part concentrated liquid to one part water (20 Cal/30 mL). For comprehensive preparation guidelines, consult the product label. Powder One level, unpacked scoop of powder is used for every 60 mL of water at a standard dilution (20 Cal/30 mL). Formulas for toddlers or stage three are included.

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Explanation:

a) 0.4998 mol

b) 0.249 mol

because some system are so large,small,or complex they are difficult to predict

Scientists used models because some systems are so large, small, or complex they are difficult to predict, to aid in the development of questions and explanations about systems, and to replicate and simplify physical reality to allow for precise experiments. The correct option is B.

A scientist is someone who collects and analyzes research and evidence in order to develop and test hypotheses and gain and share understanding and knowledge.

A scientist can be further defined by how they approach this, for example, through the use of statistics or data.

A scientist is a professional who conducts and collects research to advance knowledge in a specific field.

Scientists may develop hypotheses, test them using various methods such as statistics and data, and draw conclusions based on the evidence.

Models were used by scientists because some systems are so large, small, or complex that they are difficult to predict.

To aid in the development of questions and explanations about systems, and to replicate and simplify physical reality in order to conduct precise experiments.

Thus, the correct option is B.

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Answer:

2000 Liters

Explanation:

1 cubic meter is equal to 1000 liters

using that same conversion fact we get

2 cubic meters X 1000 Liters = 2000 Liters

There were approximately 5.878 millimoles (mmoles) of dry air present.

To determine the number of millimoles (mmoles) of dry air present, we can use the ideal gas law equation:

PV = nRT

Where:

P = pressure in atmospheres

V = volume in liters

n = number of moles

R = ideal gas constant (0.0821 L·atm/(mol·K))

T = temperature in Kelvin

First, we need to convert the given volume from milliliters to liters:

V = 12.9 mL = 12.9 mL * (1 L / 1000 mL) = 0.0129 L

Next, we need to convert the given temperature from Celsius to Kelvin:

T = 5.0 °C + 273.15 = 278.15 K

Now we can rearrange the ideal gas law equation to solve for the number of moles (n):

n = (PV) / (RT)

Substituting the given values into the equation:

n = (0.989 atm * 0.0129 L) / (0.0821 L·atm/(mol·K) * 278.15 K)

Calculating the result:

n ≈ 0.005878 moles

Finally, we can convert moles to millimoles by multiplying by 1000:

mmoles = 0.005878 moles * 1000 = 5.878 mmol

Therefore, there were approximately 5.878 millimoles (mmoles) of dry air present.

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