Pb + PbO2 + 2H2SO4 2PbSO4 + 2H2O How many moles of water are produced if 5.43 mol PbO2 are consumed?

Coffee thermos- Maintains heat in the thermos through insulation

Kitchen Appliances- Applicances such as refrigerators keep items cool, while toasters and pots are used to heat items up

Lunchbox- Many lunchboxes are insulated with materials that enables the box to keep cool.

a) Answer is: The electrical attraction between a proton and an electron is forty powers of ten stronger than their gravitational attraction.

Proton is a subatomic particle with a positive electric charge of +1e elementary charge.

The electron (symbol: e⁻) is a subatomic particle whose electric charge is negative one elementary charge.

Opposite charges (positive and negative) attract one another.

b) Answer is: Lithium, with an atomic mass of 6.94, is the lightest of all the metals and is therefore an obvious candidate for battery use.

The atomic mass is the average mass of element.

The average atomic mass of krypton =  

= ω(⁸²Kr) · Ar(⁸²Kr) + ω(⁸³Kr)·Ar(⁸³Kr) + ω(⁸⁴Kr) · Ar(⁸⁴Kr) + ω(⁸⁵Kr)· Ar(⁸⁵Kr).

ω(Kr) is average abundance of isotopes of krypton.

Ar(Kr) is atomic mass of krypton isotope.

Another examples, atomic mass of phosphorus (P) is 30.97 and atomic mass of oxygen (O) is 15.99.

c) Answer is: Protons and neutrons have masses of approximately 1 atomic mass unit each.

The unified atomic mass unit (amu) is a standard unit of atom mass.  

One unified atomic mass unit is approximately the mass of one nucleon (protons or neutrons).

The unified atomic mass unit is equal 1.66·10⁻²⁷ kg.  

d) Answer is: Other species can see colors of the spectrum that are invisible to us.

For example, a common butterfly has five times more photoreceptors in their eyes than human.

So butterfly can see ultraviolet and violet spectar of colors (human can not see violet and ultraviolet), they see different wavelength than human.

e) Answer is: Technological advances have taken much of the drudgery out of the assembly line and car plant.

Drudgery is hard monotonous routine work.

At assembly lines and car plant at the beggining of the 20th century, hard work were doing humans, now with technology advances, that work is than by the machines or robots.

f) Answer is: Nitrogen has 7 protons and 7 neutrons in the nucleus, giving it a mass number of 14.

The mass number (A) is sum of the number of protons and the number of neutrons in atom.

n°(N) = 7; number of neutrons in nitrogen atom.

p⁺(N) = 7; number of protons in nitrogen atom.

A = n° + p⁺.

A(N) = 7 + 7.

A(N) = 14; nitrogen mass number is 14.

h) Answer is: The system thus avoids the seemingly interminable delays that bedevil on-line services when they are used to transmit graphics.

Interminable means something continuing for too long and because of that is boring or annoying.

i) Answer is: The nucleus of a deuterium atom contains a proton and a neutron.

Deuterium (₁²H or D) is an isotope of the hydrogen (H).

Deuterium has atomic number 1 (it has one proton) and mass number 2.

p⁺(D) = 1; number of protons in deuterium.

A = n° + p⁺.

A(D) = 2; mass number of deuterium.

n°(D) = 2 -1.

n°(D) = 1; number of neutrons in deuterium.

Isotopes are chemical elements with same atomic number, but different mass number (different number of neutrons).

j) Answer is: Newspapers and television perceive us to slit all the candy open to ensure that it contains no foreign body.

Newspapers and television make us to belief in or about something.

k) Answer is: But barium has an atomic number of 56, barely more than half that of uranium.

Atomic number (Z) is the number of protons (number of protons in neutral atom is the same as number of an electrons), which is characteristic of a chemical element,

Atomic number is unique and defines an element.

Atomic number of uranium (U) is 92 (Z = 92).

l) Answer is: The third isotope of hydrogen, hydrogen-3 or tritium, is highly radioactive and has a very short half-life.

Tritium (₁³H or T) is an isotope of the hydrogen (H).

Tritium has atomic number(Z) 1 and mass number(A) 3.

p⁺(T) = 1; number of protons in the tritium.

A = n° + p⁺.

A(T) = 3; mass number of the tritium.

n°(T) = 3 -1.

n°(T) = 2; number of neutrons in tritium.

Isotopes are chemical elements with same atomic number, but different mass number (different number of neutrons), hydrogen, besides deuterium and tritium, has isotope protium.

Final answer:

Transition metals in groups 1B-8B on the periodic table display similar properties such as high melting and boiling points, good electrical and heat conductivity, and the ability to form colored compounds.

Explanation:

The elements in groups 1B-8B on the periodic table, also known as transition metals, display similar properties. These elements have partially filled d orbitals in their electron configurations, which give them their unique characteristics. Some common properties of transition metals include high melting and boiling points, good conductors of electricity and heat, ability to form colored compounds, and variable oxidation states.

Therefore, the required properties are high melting and boiling points, good electrical and heat conductivity, and the ability to form colored compounds.

The answer is 40.5.

Standard form is in answered or not in a different form.

So, you must solve this.

4.05 * 10 = 40.5

Have a great day :) Let me know if you need help with anything else!

The question asked about converting a number in scientific notation to standard form. The number 4.05 x 10 is converted into its standard form by moving the decimal point of 4.05 one place to the right, which gives us 40.5.

The number provided is in a format known as scientific notation. To convert it to its standard form, we just need to follow a few steps. The number provided is 4.05 x 10. Converting this to standard form involves multiplying the number outside the 'x' (i.e., 4.05) by 10. However, as there's no specified power of 10 provided (like 10^2, 10^3 etc.), we assume it to be 10^1. So, we simply move the decimal point in 4.05 one place to the right because it's 10^1. Thus, the standard form of 4.05 x 10 is 40.5.

https://brainly.com/question/15331767

#SPJ3

A "natural" chemical change would be burning wood, cooking eggs, baking a cake and milk going sour. These changes can't be changed so therefore they are chemical changes.

A natural physical change would be mixing salt or sand with water, melting or boiling water, cutting wood, and shredding paper. The salt and sand can be removed from the water. Hot and cold water are still water. Wood and paper didn't change their composition. All of these examples are reversible.

Answer:

Chemical change:

Physical change:

Explanation:

The difference chemical and physical change is physical change is the change of form, such as change in shape, and chemical change is the change of chemical bonds.

An Environmental Impact Study is used to provide a sufficient level of detail to demonstrate that a proposed development will have no negative impacts on the natural features or ecological functions of the subject and surrounding (“adjacent”) lands. Hope this helps!!!

Only an apple will float when placed in water.

An object will float in water if its density is less than that of water (1.0 g/mL).

An object will sink in water if its density is greater than that of water.

Thus, solid objects made of gold, iron, or rubber will all sink in water.

Answer:

There are [tex]1.207\times 10^{24} atoms[/tex] in 80.2 grams of calcium.

Explanation:

Atomic mass of calcium = 40 g/mol

Mass of calcium given = 80.2 g

Moles of calcium = [tex]\frac{80.2 g}{40 g/mol}=2.005 mol[/tex]

1 mol = [tex]N_A=6.022\times 10^{23} [/tex] atoms/ molecules, ions

Number of atoms of calcium in 2.005 moles of calcium:

[tex]2.005 \times 6.022\times 10^{23}=1.207\times 10^{24} atoms[/tex]

There are [tex]1.207\times 10^{24} atoms[/tex] in 80.2 grams of calcium.

The number of atoms in 80.2grams of calcium is 1.207 × 10²⁴ atoms.

The number of atoms of an element can be calculated by multiplying the number of moles of the substance by Avogadro's number as follows:

no of atoms = no of moles × Avogadro's number

According to this question, 80.2grams of calcium are given. Calcium has a molar mass of 40.0g/mol. The number of moles can be calculated as follows:

no of moles = 80.2g ÷ 40g/mol = 2.005mol

No of atoms = 2.005mol × 6.02 × 10²³

no of atoms = 1.207 × 10²⁴ atoms

Learn more about atoms at: https://brainly.com/question/1566330

#SPJ4

Answer:

Metals are malleable.

Explanation:

The metals are the substances possessing an abundant amount of electrons. They are placed majorly on the left side of the periodic table. The metals are considered as the good conductors of electricity and heat, they are lustrous in appearance, and usually have a high melting point. However, the main property, which distinguishes it from other substances is that they are malleable and ductile, that is, they can be transformed into wires and thin sheets.

Answer:  + 4 m/s

Working Out:

V = Δ x  ÷  Δ t ;where V =  velocity, Δ x = displacement, Δ t = change in time

V = Δ x  ÷  Δ t

V = (12 m east) ÷ 3.0 s

V = 4 m/s to the east  OR V = + 4 m/s

∴ The velocity of the wave is + 4 m/s

Answer:

4 m/s

Explanation: TOOK THE TEST

I am pretty sure the answer is C, but I am not certain.

The correct answer is A.) 3d

The correct answer is option C. Iron combines readily with oxygen is the chemical property of iron.

The chemical property of iron is revealed when it reacts with oxygen of the air in the presence of moisture in a chemical reaction to form iron oxide or rust.

Rust corrodes and discolors the shiny, bright white iron metal.  

Answer:

C) Iron combines readily with oxygen.

Explanation:

A physical property can be measured and observed without changing the composition or identity of the substance; while a chemical property is observed when a chemical change is given, such as a reaction.

So, the only statement that implies a chemical change is the rapid combination of iron with oxygen, forming an oxide which is a new substance.

Answer:

The answer is D.) It is a base because it increases the concentration of hydroxide ions.

Explanation:

Learn more at: https://brainly.com/question/11749651

Answer:

It is a base because it increases the concentration of hydroxide ions.

Explanation:

It is the same as an elements number of protons.

usually its rubber please give me the brainliest!

It is yet unknown compound having highest melting point of all compounds.

It is made up of right amounts of  hafnium, nitrogen, and carbon would have a melting point of more than 4400 K (7460°F).

That's about two-thirds the temperature at the surface of the sun and 200 K higher than the highest melting point ever recorded experimentally.

Answer is: A) it would increase .

Boyle's Law (the pressure-volume law): volume of a given amount of gas held at constant temperature varies inversely with the applied pressure when the temperature and mass are constant.  

p₁V₁ = p₂V₂ (the product of the initial volume and pressure is equal to the product of the volume and pressure after a change).

For example:

p₁ = 1.2 atm; starting pressure.

V₁ = 2.0 L., starting volume.

V₂ = 1.0 L; final volume, smaller than starting volume.

p₂ = ?; final pressure.

1.2 atm · 2 L = p₂ · 1 L.  

p₂ = 1.2 atm · 2 L / 1 L.  

p₂ = 2.4 atm.

When volume goes up, pressure goes down.  

When volume goes down, pressure goes up.  

The chemical property of hydrogen gas is that it burns in the air.  

• The lightest element is hydrogen, it can explode at concentrations ranging from 4 to 75 percent by volume in the existence of a flame, sunlight, or a spark.  

• One of the prime chemical properties of hydrogen gas is that it is highly flammable and can burn in air at a very broad array of concentrations that is between 4 to 75 percent by volume.  

• Some of the physical properties of hydrogen gas are that it is colorless, odorless, nonmetallic, non-toxic, exhibits a density of 0.09 grams per liter, and has a boiling point of -252.87 degree C or 20 K at standard pressure.  

Thus, of the mentioned statements, option 2 is correct, that is, the chemical property of hydrogen gas is that it burns in the air.  

To know more about:

https://brainly.com/question/22576640

Answer:

35.8 u

Explanation:

The atomic mass of Cl is the weighted average of the atomic masses of its isotopes.

We multiply the atomic mass of each isotope by a number representing its relative importance (i.e., its percent abundance).

Atomic mass of Cl-35 = 17p + 18n = 17 × 1.007 u + 18 × 1.009 u

= 17.119 u + 18.162 u = 35.28 u

Atomic mass of Cl-37 = 17p + 20n = 17 × 1.007 u + 20 × 1.009 u

= 17.119 u + 20.180 u = 37.30 u

Set up a table for easy calculation.

0.755 × 35.28 u =  26.64  u

0.245 × 37.30 u =    9.138 u

              TOTAL = 35.8     u

Note: The actual atomic mass of Cl is 35.45 u.

The calculated value above is incorrect because

(a) the given isotopic percentages are incorrect and

(b) the protons and neutrons have less mass when they are in the nucleus than when they are free. Thus, the calculated masses of Cl-35 and Cl-37 are too high.

The average atomic mass of chlorine can be calculated as a weighted average of its two isotopes' masses, with weights reflecting their proportions. Isotopes are variations of an element with different numbers of neutrons, and understanding them helps us calculate average atomic masses. Similar calculations apply for other elements with multiple isotopes, such as boron.

The subject of this question is the average atomic mass of the element chlorine (Cl), given the proportions of its two isotopes: chlorine-35 and chlorine-37, with the respective proportions of 75.5% and 24.5%. The calculation is similar to finding a weighted average. This involves multiplying each individual isotope mass by its percentage (expressed as a decimal), and then adding the products together: (35amu*0.755) + (37amu*0.245).

Isotopes are variations of an element that have the same number of protons, but different numbers of neutrons. This concept is important in understanding the calculation of an element's average atomic mass. The atomic mass listed on the periodic table for each element is a weighted average of its isotopes' masses, with the weights being the natural abundance of each isotope. This is why elements, even those with atomic masses in square brackets due to their unstable nature, have precise average atomic masses.

For example, a similar element, boron, has two isotopes as well: 19.9% of all boron atoms are ¹0B with a mass of 10.0129 amu, and the remaining 80.1% are ¹¹B with a mass of 11.0093 amu. The average atomic mass for boron is then also a weighted average, calculated in a similar way to chlorine.

https://brainly.com/question/13753702

#SPJ3

Answer and explanation;

An element block is a set of elements located in adjacent element groups.

There are four blocks; s, p, d, f; which originated from descriptions of spectroscopic lines of atomic orbitals: sharp, principal, diffuse and fundamental.

s-block; the first two groups of the periodic table, the s-block metals:

P-block elements include the last six element groups of the periodic table, excluding helium. The p-block elements include all of the nonmetals except for hydrogen and helium, the semi-metals, and the post-transition metals.

D-block elements are transition metals of element groups 3-12. D-Block elements:

f-block; Inner transition elements, usually the lanthanide and actinide series, including lanthanum and actinium. These elements are metals which have:

Uniqueness of group D elements; Normally across the period atomic radii should decrease. But d-block elements do not follow this trend. It increases From V to Cr and them remains constant and decreases and remains constant again.

Neutrons and protons each weight approximately 1 unit, while electrons weigh almost nil.

The atomic number tells us the number of protons (and electrons) there are in each atom.  

Thus the mass number (88)  is the total of the number of neutrons (N) and protons (38).

Therefore the number of neutrons is N=(88-38)=50

The correct answer is option 4 and 5.

The electron domain geometry for an ammonia molecule, NH₃ has tetrahedral electron domain geometry. In NH₃ there are three bond pair electrons and one lone pair electron. Therefore, NH₃ has four electron pairs which are distributed in a tetrahedral shape.

The molecular geometry for an ammonia molecule, NH₃ is trigonal-pyramidal molecular geometry. Ammonia has one lone pair of electron and three bond pairs of electrons thus the resulting molecular geometry is trigonal-pyramidal.  

For an ammonia molecule, the electron domain geometry is tetrahedral, and the molecular geometry is trigonal pyramidal. Therefore, the fourth and fifth option is correct.

The electron domain geometry describes the arrangement of electron domains around the central atom, where an electron domain can be a bond or a lone pair of electrons.

Molecular geometry refers to the arrangement of atoms in a molecule, considering both the bonding and nonbonding electron pairs.

In ammonia, the three hydrogen atoms are bonded to the central nitrogen atom, and the nitrogen atom has one lone pair of electrons.

To learn more about electron domain geometry, follow the link:

https://brainly.com/question/30461548

#SPJ6

It is Iron 2 (Fe2) and Oxygen 3 (O3). Hope this helps!

The chemical formula Fe₂O₃ corresponds to the ionic compound Iron (III) Oxide.

An ionic compound is a chemical compound composed of positively charged ions (cations) and negatively charged ions (anions) that are held together by electrostatic forces.

In this compound, Fe represents iron, and the Roman numeral III indicates the charge on the iron ion, which is +3. The symbol O represents oxygen.

Iron (III) Oxide is commonly known as rust and is a reddish-brown compound that forms when iron reacts with oxygen in the presence of moisture.

To learn more about the ionic compound, follow the link:

https://brainly.com/question/30420333

#SPJ6

A. I, III, and IV only.

Answer:

A. I, III, and IV only

Explanation:

The cycling of water in and out of the atmosphere is an important determinant of weather and climate. Changes in humidity and average rainfall usually depend on this factor.

Uneven heating of the earth by the sun also creates unique patterns of changes in weather and climatic conditions around the world.

Global patterns of atmospheric movement affect parameters such as wind speed etc.

The volume of water measured using the graduated cylinder is not exactly identical identical to the volume calculated.

Calculated volume is theoretical value calculated from the density and mass of water.

But volume measured in cylinder can contain the personal error of individual.

Because in graduated cylinder volume is measured in a specific way that is:

Explanation:

When designing and conducting a scientific experiment then it is necessary to sequentially follows all the steps necessary for the experiment.

Also, it is required to identify independent variables, if any. On the other hand, it is required to address any confounding variables, so that it becomes mentioned the type or number of variables present.

Thus, we can conclude that when designing and conducting a scientific experiment:

The first step is canceling out the like term, in this case it is the atoms and mole specification.  I use e instead of multiplying times 10 to a power, it is mostly used in higher sciences but I think it is easier and it is in most calculators.  So your equations is 7.43e22 Mg multiplied by (1/6.02e23) multiplied by (24.30) Mg.  So all together it is 7.43e22 (1/6.02e23) (24.30).  Then just multiply across, it is easier to break it up.  7.43e22 times (1/6.02e23)= .1234219269.  Take that and multiply it by 24.30.  So that looks like (0.1234219269)x(24.3)= 2.999152824.  So if it would be 2.9992 grams of Mg.

Final answer:

Ecology, paleontology, and botany are all branches of biology, which is the area of science they pertain to.

Explanation:

If someone told you they had a career in either ecology, paleontology, or botany, they would be working in the area of biology. These are all branches of biological science that deal with different aspects of living organisms and their environments. Ecology involves the study of how organisms interact with each other and their environment, paleontology uses fossils to understand the history of life on Earth, and botany focuses on the study of plants. Biology, as a natural science, encompasses a variety of fields that all aim to understand the various facets of life and living organisms.

The reaction is a synthesis…

[tex]4Al + 3O_2 \longrightarrow 2Al_2O_3\\[/tex]

… because two substances are combining to make one other substance.

[tex]4\stackrel{\hbox{0}}{\hbox{Al}} + 3\stackrel{\hbox{0}}{\hbox{O}}_2 \longrightarrow 2\stackrel{\hbox{+3}}{\hbox{Al}}_2\stackrel{\hbox{-2}}{\hbox{O}}_3\\[/tex]

It is also a reduction-oxidation reaction because the oxidation number of Al increases from 0 to +3 and the oxidation number of O decreases from 0 to -2.

which is known as molecules/compounds.