Bauxite is best used for making (1 point)
nails
wires
paints
drains
***missed it on test when answered wires****

Answer:

1. The final temperature of the metal is 111 °C.

2. The change in the temperature of the water is 6.2 °C

3. The change in the temperature of the metal is 40.6 °C.

Explanation:

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

Initial temperature of metal (Tₘ₁) = 70.4 °C

Initial temperature of water (Tᵥᵥ₁) = 23.6 °C

Equilibrium temperature (Tₑ) = 29.8 °C

1. Determination of the final temperature of metal.

We'll begin by calculating the change in temperature of the metal. This can be obtained as follow:

Initial temperature of metal (Tₘ₁) = 70.4 °C

Equilibrium temperature (Tₑ) = 29.8 °C

Change in temperature of metal (ΔTₘ) =?

ΔTₘ = Tₘ₁ – Tₑ

ΔTₘ = 70.4 – 29.8

ΔTₘ = 40.6 °C

Finally, we shall determine the final temperature of the metal. This can be obtained as follow:

Initial temperature of metal (Tₘ₁) = 70.4 °C

Change in temperature of water (ΔTₘ) = 40.6 °C

Final temperature of metal (Tₘ₂) =?

40.6 = Tₘ₂ – 70.4

Collect like terms

40.6 + 70.4 = Tₘ₂

111 = Tₘ₂

Tₘ₂ = 111 °C

Thus, the final temperature of the metal is 111 °C

2. Determination of the change in the temperature of the water.

Initial temperature of water (Tᵥᵥ₁) = 23.6 °C

Equilibrium temperature (Tₑ) = 29.8 °C

Change in temperature of water (ΔTᵥᵥ) =?

ΔTᵥᵥ = Tₑ – Tᵥᵥ₁

ΔTᵥᵥ = 29.8 – 23.6

ΔTᵥᵥ = 6.2 °C

Therefore, the change in the temperature of the water is 6.2 °C

3. Determination of the change in the temperature of the metal.

The change in the temperature of the metal is 40.6 °C.

Please solution 1 above for explanation.

Answer:

29.8 C

6.2 C

-40.6 C

:)

Explanation:

The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, 0.025  is the number of moles of K+ ions are present in 250 mL of a 0.4M KCl solution.

Molarity can be calculated by dividing number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.

Mathematically,

Molarity= number of moles of solute/volume of solution in litre

Substituting values in equation 1

0.4M=number of moles of solute/0.25

number of moles of solute=0.025moles

Therefore, 0.025  is the number of moles of K+ ions are present in 250 mL of a 0.4M KCl solution.

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Answer:

B. 28.1 amu

Explanation:

The number of moles of helium (He) needed to make the balloon rise is 0.043 moles.

The number of moles of a gas can be calculated using the following expression:

V₁/n₁ = V₂/n₂

Where;

Avogadro’s law to predict what will happen to the volume of a sample of gas as we change the number of moles. Because V/n is a constant for any given sample of gas (at constant P and T).

At constant temperature and pressure the volume of a gas is directly proportional to the number of moles of gas.

0.46/0.0226 = 0.865/n

20.3539823n = 0.865

n = 0.043 moles

Therefore, 0.043 moles is the number of moles of the gas when the balloon rises.

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Answer:

Option B. 384 nm

Explanation:

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

Frequency (f) = 7.81×10¹⁴ Hz

Velocity of photon (v) = 3×10⁸ m/s

Wavelength (λ) =?

The wavelength of the photon can be obtained as follow:

v = λf

3×10⁸ = λ × 7.81×10¹⁴

Divide both side by 7.81×10¹⁴

λ = 3×10⁸ / 7.81×10¹⁴

λ = 3.84×10¯⁷ m

Finally, we shall convert 3.84×10¯⁷ M to nm. This can be obtained as follow:

1×10¯⁹ m = 1 nm

Therefore,

3.84×10¯⁷ m = 3.84×10¯⁷ m × 1 nm / 1×10¯⁹ m

3.84×10¯⁷ m = 384 nm

Thus, the wavelength of the photon is 384 nm

Answer: The answer is Conduction

Answer:

Conduction

Explanation:

Conduction happens when materials or objects are in direct contact with each other. The molecules in the warmer object vibrate faster than the ones in the cooler object.

By applying Boyle's law, the new volume of this gas is equal to: D. 4.0 L.

Given the following data:

Initial volume = 3.0 L.

New pressure = 1.5 atm.

Initial pressure = 2.0 atm.

In order to calculate the new volume of this gas, we would apply Boyle's law. Mathematically, Boyle's law is given by this formula:

PV = k

P₁V₁ = P₂V₂

Where:

Making V₂ the subject of formula, we have:

V₂ = (P₁V₁)/P₂

Substituting the given parameters into the formula, we have;

V₂ = (2.0 × 3.0)/1.5

V₂ = 6.0/1.5

V₂ = 4.0 L.

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Answer:

D. 4.0 Liters

Explanation:

I took the exam

Answer:

A. one potassium and one iodine

Explanation:

K is a metal and I is a nonmetal, so K will lose electrons to form a cation and I will gain electrons to form an anion. Together, they will be bonded through an ionic bond. To determine how many electrons they gain or lose and how many atoms are in the chemical formula, we need to consider the octet's rule: an atom will gain, lose, or share electrons until it has 8 electrons in its valence shell.

We need 1 K⁺ and 1 I⁻ to form the neutral salt KI.

Answer:

b. 3.66x10²³ atoms of chromium.

Explanation:

First we calculate how many moles are there in 31 grams of chromium, using its molar mass:

Then we calculate how many atoms are there in 0.608 moles, using Avogadro's number:

The correct answer is thus option b. 3.66x10²³ atoms of chromium.

Answer:  Blue whales, like humans, obtain molecules from food and air through a process of digestion and respiration. During digestion, molecules in food are broken down and absorbed into the bloodstream, while during respiration, oxygen molecules in the air are absorbed into the bloodstream. Both processes enable blue whales to obtain the necessary molecules for energy, growth, and development.

Answer:

neutrons = 20

Explanation:

No. of Neutrons = Mass No. - Atomic No

= 39 - 19

=20

Answer:

1) What is the element? Potassium

2) how many neutrons does it have? 20

3) If it is a neutral atom how many electrons does it have?​ 39

Please mark as brainliest if answer is right

Have a great day, be safe and healthy  

Thank u  

XD  

Answer:

Electrolysis is the passing of a direct electric current through an electrolyte producing chemical reactions at the electrodes and decomposition of the materials. The main components required to achieve electrolysis are an electrolyte, electrodes, and an external power source.

Explanation:

Answer:

In chemistry and manufacturing, electrolysis is a technique that uses direct electric current to drive an otherwise non-spontaneous chemical reaction. Electrolysis is commercially important as a stage in the separation of elements from naturally occurring sources such as ores using an electrolytic cell.

hope it helps uh....

I am new here...

thanks ^^

Sublevels are indicated by letters s, p, d, and f.

How do write Electronic configuration?

Electron configurations have a standard notation that tells you the principle energy levels and sublevels that electrons occupy. here is Sulphur:

The atomic number of Sulphur is 16.

the electronic configuration of Sulphur is 1s2 2s2 2p6 3s2 3p4.

The 4s sublevel has lower energy than the 3d sublevel,

so, it fills next.

One orbital can house a maximum of two electrons, and there are four different types of orbitals (s, p, d, and f). More electrons can be held in the p, d, and f orbitals since they contain various sublevels. According to its location on the periodic table, each element's electron configuration is distinct.

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The global climate was colder than normal from 1650 to 1700. This conclusion is most likely correct. Therefore, option A is correct.

Global climate refers to how heat and precipitation are distributed over a lengthy period of time on Earth's surface. The average temperature of the planet is kept at roughly 60°F (16°C) by heat from the sun, which is within the range required for biological life and the preservation of the planet's liquid water reserves.

Global climate change is the collective term for all the Earth's average long-term changes. Along with changing precipitation patterns and higher temperatures, these also include the consequences of global warming, such as: rising sea levels alpine glaciers are thinning.

Thus, option A is correct.

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Your question is incomplete probably your question was

The graph below shows the averaged sunspots from 1610 to 2007. The graph shows sunspot number on the y axis and years 1600, 1650, 1700, 1750, 1800, 1850, 1900, 1950, and 2000 on the x axis. The graph rises and falls in a cyclic order in gaps of approximately 10 years. The number of sunspots observed in 1610 was 40, in 1650 it was 5, in 1700 it was 10, in 1750 it was 90 and the number of sunspots in 1800 was 50. The number of sunspots observed in 1850 was 130 and the number of sunspots in 1900 was 10. The number of sunspots observed in 1950 was 150 and the number of sunspots observed in 2000 was 30. Based on the graph, which of these conclusions is correct? Some of the previously warm regions became colder from 1650 to 1700. Some of the previously cold regions became warmer from 1600 to 1700. Some of the previously warm regions became warmer from 1610 to 1700. Some of the previously cold regions became colder from 1900 to 1950.

8 acidic oxides, take your pick <3

Aluminium oxide.

Silicon dioxide.

Phosphorus oxides.

Sulfur oxides.

Chlorine oxides.

Iron oxides.

Chromium oxides.

Vanadium oxides

Answer:

3.25×10²⁴ molecules

Explanation:

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

Mass of H₂O = 97.2 g

Number of molecule of H₂O =?

From Avogadro's hypothesis, we understood that:

1 mole of H₂O = 6.02×10²³ molecules

Next, we shall determine the mass of 1 mole of H₂O. This can be obtained as follow:

1 mole of H₂O = (2×1) + 16

= 2 + 16

= 18 g

Thus,

18 g of H₂O = 6.02×10²³ molecules

Finally, we shall determine the number of molecules in 97.2 g of H₂O. This can be obtained as follow:

18 g of H₂O = 6.02×10²³ molecules

Therefore,

97.2 g of H₂O = 97.2 × 6.02×10²³ / 18

97.2 g of H₂O = 3.25×10²⁴ molecules

Thus, 97.2 g of H₂O contains 3.25×10²⁴ molecules.

Mass can be calculated by using moles which can be further calculated from multiplication of Molarity to volume. Therefore, the molarity of the HCl solution is 3M. the correct option is option C.

Molarity can be calculated by dividing  number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/litre. It measure the concentration of any solute in a solution.

Other concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution

Mathematically,

2HCl + Ca(OH)[tex]_2[/tex] [tex]\rightarrow[/tex] CaCl[tex]_2[/tex] + 2H[tex]_2[/tex]O

Molarity of HCL× Volume of HCL=Molarity of Ca(OH)[tex]_2[/tex] ×Volume of  Ca(OH)[tex]_2[/tex]

Molarity of HCL× 1.00 L=1.50 M× 2.00 L

Molarity =3M

Therefore, the molarity of the HCl solution is 3M. the correct option is option C.

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Answer:

Capacity is the amount of liquid a container can hold. Mass is how much space an object takes up.

Explanation:

All the others are incorrect.

Answer:

Get a controlled environment, such as a pool or even a bowl. Pour some oil in it then you can test your solutions without causing any damage.

Explanation:

Natural radioactive elements are those that spontaneously radiate in nature and have an atomic number between 82 and 92. In dirt, air, water, rocks, plants, food, uranium—a radioactive element—can be discovered.

When an element's atoms contain excess neutrons or protons, the extra energy produced in the nucleus causes the atom to lose its equilibrium or become unstable. if and how radioactive particles can become stable. Radiation is produced by radioactive atoms' unstable nuclei.

Compared to beta and gamma particles, alpha particles represent the most dangerous internal threat. The most hazardous methods of exposure to radioactive elements that release alpha and beta radiation are ingestion, inhalation, absorption, and injection. Gamma radiation is the outside hazard that causes the most damage.

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Answer:

Explanation:

Dear student, there is no sufficient information to calculate the empirical formula but we will explain what Empirical Formula is all about.

An empirical formula is made up of symbols that denote the elements in a complex, such as H for hydrogen and O for oxygen, as well as subscripts that indicate the number of atoms from each constituent element.

The empirical formula is the atoms in a complex with the lowest whole number ratio. The precise number of atoms in a single molecule is not necessarily shown.

Answer:

Why do chemists use the mole as a counting unit? Because chemical reactions often involve large numbers of small particles, chemists use a counting unit called the mole to measure amounts of a substance. ... The discovery enabled scientists to classify certain chemical reactions as transfers of electrons between atoms.Explanation:

Chemical reactions often involve large numbers of small particles, chemists use a counting unit called the mole to measure amounts of a substance.

It is not possible to vell with a single atom or molecule because we

can't count them.

Chemists have set a number of particles with which to toil that is convenient. As molecules are very small.

Thus,  chemists use a counting unit called the mole to measure the amounts of a substance.

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Answer:

4.44 moles

Explanation:

first u have to change the units into dm cube.

cm cube÷1000=dm cube

185cmcube÷1000= 0.185dm cube

24dm cube= 1 mole(formula)

0.185dm cube × 24dm cube=4.44 moles

Answer:

B. Chlorine gas is yellow-green in color.

Answer:

I think the answer is 14 I am not sure

Answer: the substance is from an animal source

Explanation:

Because of their different longitude.

Answer:

0.0710

Explanation:

Basedon the data provided, the concentration of the standardized titrant is 0.142 M.

A standard solution is a solution of known concentration.

The concentration of the standardized titrant is calculated from the mole of KHP required.

Moles of KHP = 0.7625 g/ 204.22 g/mol

Moles of KHP = 0.00373 mol

Mole ratio of KHP and NaOH is determined from the equation of the reaction below:

Therefore, moles of NaOH = 0.00373 moles

Molarity of a NaOH = moles/volume in L

volume of titrant = 26.32 mL = 0.02632 L

Molarity of NaOH = 0.00373/0.02632

Molarity of NaOH = 0.142 M

Therefore, the concentration of the standardized titrant is 0.142 M.

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