A student painted one wall black and one wall white. Which color of paint will most likely appear brighter?

Answer:

It increases

Explanation:

The atomic radii increases because you are adding more shells/electrons

Evaporation and crystallization are two common processes by which minerals form from a solution. Here option C is the correct answer.

When a solution containing dissolved minerals is left undisturbed, the water content of the solution gradually decreases through evaporation. As the water evaporates, the concentration of dissolved minerals increases, eventually reaching a point where the solution becomes supersaturated.

At this stage, the excess minerals start to come together and form solid crystals. This process is known as crystallization. Evaporation and crystallization commonly occur in environments with high rates of evaporation, such as hot and arid regions or shallow bodies of water.

Examples of minerals formed through evaporation and crystallization include halite (rock salt), gypsum, and borax. These minerals often precipitate and accumulate in layers, forming distinctive sedimentary deposits.

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Complete question:

Which of the following are two ways in which minerals can form from a solution?

A) Sublimation and condensation

B) Fusion and solidification

C) Evaporation and crystallization

D) Oxidation and reduction

Answer:

protons are +1

Explanation:

protons are positive 1 while electrons are -1, they are equal but opposite charge

Holding a toast  will not help in preventing Johny from dying of hypothermia as the thermal energy produced by holding a hot toast is not sufficient to maintain the thermal energy of the body.

Thermal energy is defined as a type of energy which is contained within a system which is responsible for temperature rise.Heat is a type of thermal energy.It is concerned with the first law of thermodynamics.

Thermal energy arises from friction and drag.It includes the internal energy or enthalpy of a body of matter and radiation.It is related to internal energy and heat .It arises when a substance whose molecules or atoms are vibrating faster.

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Answer:

1800 g Zr(NO₃)₄

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

5.3 mol Zr(NO₃)₄

Step 2: Identify Conversions

Molar Mass of Zr - 91.22 g/mol

Molar Mass of N - 14.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of Zr(NO₃)₄ - 91.22 + 4(14.01) + 12(16.00) = 338.26 g/mol

Step 3: Convert

\(5.3 \ mol \ Zr(NO_3)_4(\frac{339.26 \ g\ Zr(NO_3)_4}{1 \ mol \ Zr(NO_3)_4} )\) = 1798.08 g Zr(NO₃)₄

Step 4: Check

We are given 2 sig figs. Follow sig fig rules and round.

1798.08 g Zr(NO₃)₄ ≈ 1800 g Zr(NO₃)₄

The type of triangle that is created by the three cities is an obtuse triangle, because 22 + 51 > 54.

Obtuse triangle is a type of triangle in which any of its angle is greater than 90 degrees, and the sum of the interior angles must by equal to 180 degrees.

Considering length AB and AC = 22 miles + 51 miles = 73 miles

The sum of length AB and AC is greater than length BC, and the opposite angle of side BC is greater than 90 degrees.

Thus, the type of triangle that is created by the three cities is an obtuse triangle, because 22 + 51 > 54.

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The transfer of energy doe not always affect the appearance of the lake because it can attain a form that is quite similar to the other. It can be because of conduction, convection, and radiation.

Heat transference can be described as a natural phenomenon that can be caused by conduction, convection, or radiation.

Convection can be defined as the transfer of energy in a given fluid such as, in this case, water. The energy transfer is due to particular molecular motion, energy is transferred by bulk, or macroscopic, the motion of the fluid.

Radiation can be defined as heat transfer through space due to electromagnetic radiation. Conduction can be defined as the transfer of energy between molecules due to direct contact.

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Bom bardment of Al-27 with a neutron-formed product is (28_13 Al) Beta decay of Al-28 to Si-28: Al-28 → Si-28 + β^-
(28_13 Al → 28_14 Si + 0_-1 β)

Bom  bardment of Al-27 with a neutron:
Al-27 + n → Al-28
(27_13 Al + 1_0 n → 28_13 Al)Bom bardment of Al-27 with a neutron:
Al-27 + n → Al-28
(27_13 Al + 1_0 n → 28_13 Al)I'd be happy to help you with your nuclear equation question. When Al-27 (aluminum-27) is bombarded with a neutron, it forms Al-28 (aluminum-28). Then, Al-28 undergoes beta decay to produce Si-28 (silicon-28). Here are the nuclear equations representing this process:

1. Bom  bardment of Al-27 with a neutron:
Al-27 + n → Al-28
(27_13 Al + 1_0 n → 28_13 Al)

2. Beta decay of Al-28 to Si-28:
Al-28 → Si-28 + β^-
(28_13 Al → 28_14 Si + 0_-1 β)

These two equations represent the process you described.

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The presence of the ions in the HCl would make the solution to conduct electricity.

Because it separates into ions (H+ and Cl-) when hydrochloric acid is dissolved in water, HCl (hydrochloric acid) solution conducts electricity. The electric charge of the H+ and Cl- ions allows them to travel and convey current across the solution.

The dissociation constant (Ka) of HCl describes how much of the compound separates into ions depending on the concentration of the solution. A higher HCl concentration will produce more ions, which will increase conductivity.

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Isotope -

What is the term for atoms that have the same number of neutrons and protons but a different energy configuration?

Atoms that have the same number of protons but different numbers of neutrons are known as isotopes. Isotopes have different atomic masses.

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The empirical formula for calcocite is Cu₂S.

Calcocite is a mineral composed of 79.9% copper and 20.1% sulfur.

The empirical formula of calcocite can be found by dividing the mass percentages of the elements by their atomic masses and then calculating the ratio of their subscripts in the smallest possible integer form.

The atomic masses of Cu and S are 63.546 and 32.066, respectively.

By using above formula - Cu: 79.9 / 63.546 = 1.257

S: 20.1 / 32.066 = 0.626

The smallest possible integer ratio between these two values is 2:1.

Therefore, the empirical formula for Calcocite is Cu₂S.

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Answer:

49 moles of atoms

Explanation:

There are 7 individual atoms in each molecule of H2SO4:  (2 hydrogens + 1 sulfur + 4 oxygens).

Therefore, if 7 moles are decomposed, there would be 7 times that amount of individual atoms:

7 x 7 = 49 moles of atoms

The ion at the center of a silicon-oxygen tetrahedron is sorrounded by four oxygen ions.

Silicate minerals are built around a molecular ion called the silicon-oxygen tetrahedron. These are generally called the rock-forming minerals. The silicon-oxygen tetrahedron (SiO4) consists of a single silicon atom at the center and four oxygen atoms located at the four corners of the tetrahedron. Each oxygen ion has a -2 charge and the silicon ion has a +4 charge. In the silicon- oxygen  tetrahedron, the silicon ion shares one of its four valence electrons with each of the four oxygen ions in a covalent bond to create a symmetrical geometric four-sided pyramid figure.

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In fact, sodium, potassium, or ammonium sulfates enhance ligand-protein interactions in HIC while also stabilizing protein structure. As a result, the most prevalent ions are (NH4)2SO4, Na2SO4, NaCl, KCl, and CH3COONH4. Figure 1 depicts how various salts can influence selectivity. The highest resolution of four standard proteins was achieved by starting with 1.7 M ammonium sulfate.

Because each salt has a different capacity to encourage hydrophobic interactions, selecting a salt for an HIC separation can be a trial and error process. When the concentration of a salt rises, the quantity of protein bound increases almost linearly up to a certain salt concentration and then exponentially at greater concentrations.When compared to other salts, ammonium sulfate often provides the greatest clarity at a particular concentration and can be used at ratios up to 2 M.

When using sodium chloride, concentrations of up to 3 M are typically needed.

Although sodium sulfate is an excellent salting-out substance, issues with protein solubility may preclude its use at high amounts.

Working with ammonium sulfate at pH levels above 8.0 is not advised.

Answer: the answer is C

Explanation:

Answer:

c. main energy level of an electron

Explanation:

An atom can be defined as the smallest unit comprising of matter that forms all chemical elements. Thus, atoms are considered to be the building blocks of matter and as such defines or determines the structure of a chemical element.

Generally, atoms are typically made up of three distinct particles and these includes; protons, neutrons and electrons.

In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.

The principal quantum number, denoted by n, represents the main or overall energy level of an electron.

Basically, this property of an electron determines its energy level, as well as its distance from the nucleus of an atom of any chemical element. Also, as the distance of each orbital from the nucleus increases, the energy level increases respectively. Thus, sets of orbitals having the same principal quantum number (n) are generally referred to as an electron shell.

6.508 g mass of of NH3 is formed when 5.36 g of nitrogen gas reacts with excess hydrogen gas.

                                N2 + 3 H2  → 2 NH3

The molar mass of N2 is 28.0 g/mol. The molar mass of NH3 is 17 g/mol.

To find the mass of NH3:

=5.36 x 2 x (17 / 28)

=182.2 / 28

= 6.508 g

The mass of ammonia is 5.36 g.

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Explanation:

CH4 + 2 O2 -> CO2 +2 H2O

4 H3N+3 O2 -> 6H2O + 2 N2

Answer:

\( ZnSO_4 + Li_2CO_3 \longrightarrow ZnCO_3 + Li_2SO_4 \)

Explanation:

Here a reaction is given to us and we need to balance the equation . The given reaction is ,

\( ZnSO_4 + Li_2CO_3 \longrightarrow ZnCO_3 + Li_2SO_4 \)

So here , we can make a table as ,

\(\begin{array}{c|c} \\ LHS & RHS \\\\ Zn = 1 & Zn = 1 \\\\ SO_4 = 1 & SO_4 =1\\\\ Li = 2 & Li= 2 \\\\ CO_3 = 1 & CO_3 = 1 \end{array}\)

We can see that the number of elements and ions is same on both LHS and RHS . Hence the reaction is already balanced .

Therefore the final reaction would be same as before that is ,

\( ZnSO_4 + Li_2CO_3 \longrightarrow ZnCO_3 + Li_2SO_4 \)

I hope this helps .

Answer:

1. Lanthanum-139 atom is the stable isotope of lanthanum with relative atomic mass 138.906348, 99.9 atom percent natural abundance and nuclear spin 7/2.

2. In fact, over 80% of electric cars sold globally utilized permanent magnet-based motors in 2019. These magnets are typically made with rare-earth materials such as neodymium and dysprosium, which have a very geographically constrained supply chain.

3. It is the second most reactive of the rare-earth metals after europium. Lanthanum oxidizes in air at room temperature to form La2O3. It slowly reacts with water and quickly dissolves in diluted acids, except hydrofluoric acid (HF) because of formation of a protective fluoride (LaF3) layer on the surface of the metal.

Explanation:

Answer:16

Explanation:

Answer:

Zinc

Zinc blende

(ZnS)

-----------------

Lead

Galena

(PbS)

-----------------

Mercury

Cinnabar

(HgS)

----------------

Copper

Copper glance

(Cu2S)

-------------------

Explanation:

Had to learn this for a test

Also, I plead the 5th

The final temperature of the water resulting from the mixing of 100 mL of 30°C water with 500 mL of 60°C water would be 55°C.

In order to calculate the final temperature of a mixture of two different temperatures of water, we can use the following formula:

\(T_{(final)} = (m_1T_1 + m_2T_2) / (m_1 + m_2)\)

where:

In this case, we have 100 mL of 30°C water and 500 mL of 60°C water. We can convert mL to grams using the density of water which is approximately 1 g/mL2. Therefore:

m1 = 100 g T1 = 30°C m2 = 500 g T2 = 60°C

Thus:

Therefore, the final temperature of the mixture is 55°C.

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Given the mass of silicon (Ms) as 10 kg, the atomic mass unit of boron (Mboron) as 10 g/mol, the density of boron (ρboron) as 2.46 g/cm³, and the majority carrier concentration of silicon (Np) as 5 × 10¹⁸/cm³, we are tasked with finding the boron concentration in silicon (Nb).

To calculate Nb, we can utilize the formula: Nb = (ρboron/Mboron) × (kd/Ms) × Np.

By substituting the given values into the equation, we obtain:

Nb = (2.46 g/cm³ ÷ 10 g/mol) × (0.3 ÷ 10 kg) × 5 × 10¹⁸/cm³.

Simplifying the expression, we find:

Nb = 3.69 × 10¹³/cm³.

Hence, the boron concentration required to produce a 10 kg p-type silicon with a majority carrier concentration of 5 × 10¹⁸/cm³ is 3.69 × 10¹³/cm³.

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Answer:

v=50km/hr

Explanation:

Given:

s= 300km

t= 6 hours

Required:

v=?

Formula:

v=s/t

Solution:

v=s/t

v=300km/6h

v=50km/hr

Hope this helps ;) ❤❤❤

The balanced equation for the combustion reaction given in the question above is:

C₂H₆O + 3O₂ -> 2CO₂ + 3H₂O

The following data were obtained from the question:

The equation C₂H₆O + O₂ -> CO₂ + H₂O can be balanced as illustrated below:

C₂H₆O + O₂ -> CO₂ + H₂O

There are 2 atoms of C on the left side and 1 atom on the right. It can be balanced by writing 2 before CO₂ as shown below:

C₂H₆O + O₂ -> 2CO₂ + H₂O

There are 6 atoms of H on the left side and 2 atoms on the right. It can be balanced by writing 3 before H₂O as shown below:

C₂H₆O + O₂ -> 2CO₂ + 3H₂O

There are a total of 3 atoms of O on the left side and a total of 7 atoms on the right. It can be balanced by writing 3 before O₂ as shown below:

C₂H₆O + 3O₂ -> 2CO₂ + 3H₂O

Thus, the equation is balanced.

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Answer

(:

Weight is basically  a measure of theme  force of gravity pulling down on an object. It depends on the object's mass and the acceleration due to gravity, which is 9.8 m/s2 on Earth. The formula for calculating weight is F = m × 9.8 m/s2, where F is the object's weight in Newtons (N) and m is the object's mass in kilograms.

Explanation:

Answer:

0.0048 mol Cr

Explanation:

Step 1: Define

Molar Mass of Chromium (Cr) - 52.00 g/mol

Step 2: Use Dimensional Analysis

\(0.25 \hspace{3} g \hspace{3} Cr(\frac{1 \hspace{3} mol \hspace{3} Cr}{52.00 \hspace{3} g \hspace{3} Cr} )\) = 0.004808 mol Cr

Step 3: Simplify

We are give 2 sig figs.

0.004808 mol Cr ≈ 0.0048 mol Cr

Answer: The number of protons in the nucleus of the atom is equal to the atomic number . The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom is equal to the sum of the number of protons and neutrons in the nucleus.

The mass of an element is the sum of number of neutrons and protons in the atom. The number of electrons and protons in an atom is same and from the mass number number of neutrons can be calculated.

Mass number of an element is the sum of the number of protons and electrons in an atom. Electrons are negatively charged particles revolving around the nucleus and protons are positively charged particles. Neutrons are neutral and have no charge.

An atom in its neutral state contains equal number of electrons and protons. This number is called its atomic number. All the positive charges are neutralized with equal number of negative charges.

Now let's take an example of nitrogen, with atomic number 7. Nitrogen contains 7 electrons and 7 protons. Its mass number is 14. Thus number of neutrons is 14- 7  =7.

If we have mass number only and the atomic number is known  lets say 13 and 24 respectively. Then number of electrons is  12 and the same for protons and number neutrons is 24 - 13 =11.

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Answer:

1.48×10²⁴ Cu atoms

Explanation:

For this question you need to use Avogadro's number 6.022×10²³atoms.

2.45 moles of Cu ×\(\frac{6.022x10x^{23} atoms }{1 mole}\)= 1.47539×10²⁴ atoms.

The moles cancel out so you are left with atoms.

Since there are 3 significant figures in the question there should be 3 significant figures in your answer, which is 1.48×10²⁴ Cu atoms.