What are the periods and epochs of the Cenozoic era?

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A strong push would mean a large magnitude of force and vice versa a weak push would mean a small magnitude.

The number 0.005802 expressed in proper scientific notation is 5.802 x 10^-3

The answer is A. factory worker

Answer:

moles = given mass/atomic mass

so H2O mass = 2 +16=18

so 12g of h2o= 12/16 = 3/4 moles

18.0 grams of water is formed when 1 mole of HCl reacts completely with 1 mole of NaOH.

Assume that:

n = number of moles

m = mass of substance

M = molar mass

Looking at the equation:

HCl + NaOH--->NaCl+H2O

Hydrogen = 1.0 g/mol

Oxygen = 16.0 g/mol

Therefore the molar mass (M) of  H2O is 18 g/mol.

Last step, find the mass (m) of water.

The formula of finding mass of substance (m) is:

m= M*n

[m = 1.0 moles × 18.0 g/mol = 18.0 grams]

Therefore 18.0 grams of water is formed when 1 mole of HCl reacts completely with 1 mole of NaOH.

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a) Amount of H₂SO₄ = 0.00500 moles.

b) H₂SO₄ + Mg(OH)₂ → MgSO₄ + 2H₂O

c) Amount of excess acid = 0.001180 moles of H₂SO₄

d) The amount of H₂SO₄ that reacted with Mg(OH)₂ is also 0.001180 moles.

e) Amount of Mg(OH)₂ = 0.02126 moles

f) The percentage by mass of magnesium hydroxide in the 1.24 g antacid tablet = 100.5%

g) Repeating quantitative measurements are important to ensure that the results are accurate and precise.

(a) To calculate the amount of sulfuric acid (H₂SO₄) in moles, we'll use the formula:

Amount (in mol) = concentration (in moldm^−3) × volume (in dm^3)

Given that the concentration of sulfuric acid is 0.100 moldm^−3 and the volume is 50.00 cm^3 (which is equivalent to 0.05000 dm^3), we can calculate the amount of sulfuric acid:

Amount = 0.100 moldm^−3 × 0.05000 dm^3

Amount = 0.00500 moles of H₂SO₄

(b) The balanced chemical equation for the reaction of sulfuric acid (H₂SO₄) with magnesium hydroxide (Mg(OH)₂) is:

H₂SO₄ + Mg(OH)₂ → MgSO₄ + 2H₂O

(c) To calculate the amount of excess acid present, we need to determine the amount of sodium hydroxide (NaOH) used to neutralize the excess sulfuric acid. The balanced equation for this reaction is:

H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O

Given that the concentration of sodium hydroxide is 0.1133 moldm^−3 and the volume used is 20.80 cm^3 (which is equivalent to 0.02080 dm^3), we can calculate the amount of sodium hydroxide used:

Amount of NaOH = 0.1133 moldm^−3 × 0.02080 dm^3

Amount of NaOH = 0.002360 moles of NaOH

Since the balanced equation shows that 2 moles of NaOH react with 1 mole of H₂SO₄, we can calculate the amount of excess acid:

Amount of excess acid = 0.002360 moles of NaOH ÷ 2

Amount of excess acid = 0.001180 moles of H₂SO₄

(d) From the balanced chemical equation in part (b), we can see that 1 mole of magnesium hydroxide (Mg(OH)₂) reacts with 1 mole of sulfuric acid (H₂SO₄). Therefore, the amount of H₂SO₄ that reacted with Mg(OH)₂ is also 0.001180 moles.

(e) To determine the mass of Mg(OH)₂ in the antacid tablet, we need to use the molar mass of Mg(OH)₂. The molar mass of Mg(OH)₂ is:

Mg: 24.31 g/mol

O: 16.00 g/mol (2 atoms)

H: 1.01 g/mol (2 atoms)

Molar mass of Mg(OH)₂ = 24.31 + (16.00 × 2) + (1.01 × 2)

Molar mass of Mg(OH)₂ = 58.33 g/mol

The amount of Mg(OH)₂ can be calculated using the following formula:

Amount (in mol) = mass (in g) ÷ molar mass (in g/mol)

Given that the mass of the antacid tablet is 1.24 g, we can calculate the amount of Mg(OH)₂:

Amount = 1.24 g ÷ 58.33 g/mol

Amount = 0.02126 moles of Mg(OH)₂

(f) The percentage by mass of magnesium hydroxide (Mg(OH)₂) in the antacid tablet can be calculated using the following formula:

Percentage by mass = (mass of Mg(OH)₂ / mass of antacid tablet) × 100

Given that the mass of Mg(OH)₂ is 0.02126 moles (as calculated in part (c)) and the mass of the antacid tablet is 1.24 g, we can calculate the percentage:

Percentage by mass = (0.02126 mol × 58.33 g/mol / 1.24 g) × 100

Percentage by mass = 100.5% (rounded to three significant figures)

(g) Repeating quantitative measurements is important for several reasons:

1. Accuracy: Repeating measurements allows for the detection and reduction of errors. By taking multiple measurements, any random errors or anomalies can be identified and averaged out, leading to a more accurate result.

2. Precision: Repeating measurements helps assess the precision or consistency of the experimental technique. If repeated measurements yield similar results, it indicates a higher level of precision.

3. Reliability: Repeating measurements improves the reliability of the data. It helps confirm the validity of the observed trends, relationships, or conclusions drawn from the data.

4. Statistical analysis: Repeating measurements allows for the application of statistical analysis to determine measures of central tendency (e.g., mean) and variability (e.g., standard deviation), providing a more robust analysis of the data.

5. Error estimation: Repeating measurements aids in error estimation and determining the uncertainty associated with the experimental results. This information is crucial for evaluating the significance of the findings and comparing them with theoretical expectations or previous studies.

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The first step in the hydrogenation of double bonds is often referred to as "adsorption" or "adsorption of reactants."

During this step, the reactants i.e., the unsaturated molecule and hydrogen gas are brought into close proximity with the metal surface of the catalyst, allowing for their interaction.

In the adsorption step, the unsaturated molecule is adsorbed onto the metal surface of the catalyst, while the hydrogen gas molecules are also adsorbed, often in a dissociated form as hydrogen atoms. The close proximity of the reactants on the metal surface enables their reaction to occur more efficiently, due to the increased likelihood of collisions between reactant species.

It's worth noting that the adsorption step is followed by the actual hydrogenation reaction, in which the double bond is reduced and hydrogen atoms are added, thus forming a saturated molecule. The metal surface of the catalyst plays a critical role in promoting this reaction by providing the necessary activation energy and by facilitating the transfer of electrons between reactants.

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Answer:

1. (put in simpler words so no one knows you got it off of brainly)

The electricity that flows to our homes is generated in power stations. From here, it flows through large transmission lines, which carry it to substations. Finally, distribution lines carry electricity from substations to houses, businesses, and schools.

2.  (put in simpler words so no one knows you got it off of brainly)

The transmission over long distances creates power losses. The major part of the energy losses comes from Joule effect in transformers and power lines. The energy is lost as heat in the conductors. This can be minimized by

answer choice 1: reducing technical losses including: replacing incorrectly sized transformers, improving the connection quality of conductors (power lines), and increasing the availability of reactive power by installing capacitor banks along transmission lines.

answer choice 2: (just in case answer choice 1 isn't what you're looking for)

You can reduce losses in your home by spreading out your electricity use evenly throughout the day, instead of running all your appliances at once.

Explanation:

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The molar mass of aluminium sulfide (Al₂S₃) is 150g/mol.

Molar mass is the mass of a given substance divided by its amount, measured in moles. It is commonly expressed in grams (sometimes kilograms) per mole.

The molar mass of a substance can be calculated by summing up the atomic mass of all the elements made up in the compound.

According to this question, aluminium sulfide with the chemical formula Al₂S₃ is given.

Molar mass of Al₂S₃ = 27(2) + 32(3)

Molar mass = 54 + 96 = 150g/mol

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Answer:

option 1. Two substances in a mixture differ in density and particle size. These properties can be used to separate the substances. These properties can be manipulated in order to have a better separation between the two substances.

Explanation:

Answer:

Two substances in a mixture differ in density and particle size. These properties can be used to separate both of them using the separating funnel or using filtration (filter paper).

Explanation:

Since their densities are different, one substance should float above the other in the mixture which allows for the separating funnel to let the substance sinking below (with the heavier density) to flow out first before changing the beaker to let the lighter substance flow out.

The substance with a bigger particle size would not be able to pass through the filter paper unlike the substance with the smaller particle size as the filter paper's pores is not big enough for it to pass through, separating both substances (with one on the paper and the other outside the filter paper, preferably in the beaker placed below the paper).

The volume of gas is 3,949.31 litre, occupied by 1.74 moles of SF6 (g) at 273 K and 1 atm.

The ideal gas law is also called as perfect gas law. It is the relation between the pressure P, volume V, and temperature T of a gas.  

Given:

Volume of gas = ?

Number of moles (n) = 1.74 moles

Temperature (T) = 273K

Pressure (P) = 1 atm

R (gas constant) = 8.314

By an ideal gas equation

PV = nRT

By putting above value in ideal gas equation, we get

1 × V = 1.74 × 8.314 × 273

V = 3,949.31 litre

Thus, The volume of gas, in L is 3,949.31 litre, occupied by 1.74 moles of SF6 (g) at 273 K and 1 atm.

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If some f₂ is added the equilibrium will move in the forward direction.

Chemical equilibrium is the state in which the concentrations of both reactants and products do not change over time and there is no observable change in the properties of the system.

chemical equilibrium, the state in the course of a reversible chemical reaction in which there is no overall change in the amounts of educts and products. A reversible chemical reaction is one in which products once formed react to form the original reactants.

Homogeneous equilibrium can be further divided into two types. A reaction in which the number of product molecules equals the number of reactant molecules.

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Molality = moles of solute/mass (in kg) of solvent

The solute here is NaCl, of which you have 40 g or 40/58.4428 = 0.6844 moles NaCl.

The solvent here is water, of which you have 1500 g or 1.500 kg H2O.

The molality of the resulting solution would thus be 0.6844 moles NaCl/1.500 kg H2O = 0.4562 mol/kg.

If you have to consider sig figs, then your final answer would have one sig fig (40 g has one sig fig). In that case, your final answer would be 0.5 mol/kg.

Answer

1.0 mol

Explanation

Given:

Volume, V = 5.0 L

Temperature, T = 215 K

Pressure, P = 342 kPa

The gas constant, R = 8.31 L kPa/mol K

What to find:

The number of moles of the gas sample.

Step-step-solution:

The number of moles of the gas can be determine using the ideal gas equation formula:

Put the given values into the formula and calculate for n:

The number of moles of the gas sample is 1.0 mol.

Answer:

This answer I think it is Al,F

Answer:

Chemical reaction

Explanation:

After new substances are formed they can't be reversed to their original state.

The number of atoms : =  6.02.10²³

Given

mass = 20.17 g of Neon

Required

The number of atoms

Solution

The mole is the number of particles(molecules, atoms, ions) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

mol Neon :

= mass : Ar Neon

= 20.17 : 20,1797 g/mol

= 0.999 ≈ 1

The number of atoms :

= 1 x  6.02.10²³

=  6.02.10²³

Answer:

the Germany scientist Alfred Wagner describes fold mountains that are found in The world are the same also geological similarity that occur between this continent are the same for example the rock that are found in brazil are the same of that of south africa.

Answer:

There is a need of 1.86 L  of Ca(NO3)2 to react with the 148g of Na2CO3

Explanation:

This is a stoichiometry problem in converting mass to volume.

The balanced chemical equation is:

Ca(NO3)2 + NaCO3 ⇒ CaCO3 +2NaNO3

Given mass of Na2CO3 = 148g

Molar mass of Na2CO3 = 23 X 2 + 12 X 3 X 16 = 106g

Number of moles of Ca(NO3)2 = Given mass / Molar mass

                                                     = 148 / 106

                                                     = 1.396 moles

From the chemical equation, 1 mole of Na2CO3 reacts with 1 mole of Ca(NO3)2

⇒1.396 moles of Na2CO3 will react with 1.396 moles of Ca(NO3)2

So,we need to find out how many liters of Ca(NO3)2 will contain 1.396 moles of Ca(NO3)2

Strength of solution is 0.75 moles

∴volume of Ca(NO3)2 = moles of Ca(NO3)2 x(1 L of Ca(NO3)2 /strength    

                                                                                                of the solution)

                                      =1.396 mol of Ca(NO3)2 x (1 L of Ca(NO3)2/ 0.75

                                                                                               mol Ca(NO3)2)

                                      = 1.86L of Ca(NO3)2

Thus 1.86L of Ca(NO3)2 is needed to react with 148g of Na2CO3

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Answer:

Approximately 7.65

Explanation:

math.

skillz.

Answer:

16 neutrons.

Explanation:

From the question given above, the following data were obtained:

Mass number = 30

Atomic number = 14

Neutron number =?

Next, we shall determine the number of protons present in the isotope. This can be obtained as follow:

The atomic number of an element is simply defined as the number of protons present in the atom of the element. Thus,

Atomic number = Proton number

Atomic number = 14

Therefore,

Proton number = 14

Finally, we shall determine the number of neutons present in the isotope as follow:

Mass number = 30

Proton number = 14

Neutron number =?

Mass number = Proton + Neutron

30 = 14 + Neutron

Collect like terms

Neutron = 30 – 14

Neutron = 16

Therefore, the isotope contains 16 neutrons.

Combustible: Charcoal, straw, cardboard, paper, candle, wood.

Non-combustible: Chalk, stone, iron rod, copper coin, glass.

Answer:

here's the answer hope it helps

Answer: B

Explanation:

Answer:

It would be Basic.

Explanation:

The higher the number, the more basic it is.

Answer:

its basic solution

Explanation:

b/c the pH value greater than7 base

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At rest, K+ concentrations are higher inside neurons. K+ has the propensity to migrate out of the neuron down the concentration gradient because it can freely pass the neuronal membrane.

The inside of the cell contains more potassium ions than the outside does. The system as a whole is electrically neutral because an anion balances out each potassium ion (on either side of the membrane). As a result, there is a high concentration of sodium ions outside the cell and a high concentration of potassium ions inside. Additionally, the neuronal membrane contains specialized proteins known as channels that create gaps in the membrane that are only permeable to certain ions.

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As a gas condenses to a liquid, the potential energy decreases.

When a substance transitions from the gaseous phase to the liquid phase, the intermolecular forces of attraction become stronger. These forces, such as London dispersion forces, dipole-dipole interactions, or hydrogen bonding, start to dominate as the gas molecules come closer together. In the gaseous state, the molecules have higher kinetic energy and are moving more freely, with greater distances between them. As the gas condenses and transitions into a liquid, the molecules become more closely packed and their motion becomes restricted. The intermolecular forces pull the molecules together, allowing them to form stable arrangements. As the gas molecules move closer and the intermolecular forces become stronger, the potential energy of the system decreases. The potential energy decreases because the molecules are moving from positions of higher potential energy (with weaker intermolecular forces) to positions of lower potential energy (with stronger intermolecular forces). Therefore, during the process of condensation, the potential energy of the system decreases as the gas transitions into a liquid.

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