A chemist is studying an unknown substance and could break the substance into its elemental components only by using chemical means.

Based on this observation, how should the unknown substance be classified?
impure substance
solution
mixture
pure substance

Answer:

CA, AI, O

Explanation:

Look at a periodic table and locate each element. Note their electronegativity levels.

Answer:

1000 or 250

Explanation:

500x2=1000

or

500/2=250

Answer:

pwede po ba tagalog

Explanation:

question ko lang po

Answer:

particle movement = kinetic energy = thermal energy = temperature.

Explanation:

kinetic energy is the force that an object in motion possesses. the particles of every substance are in motion and so they all possess kinetic energy. so if a particle moves more vigorously, it has more kinetic energy.

temperature is how hot or cold a substance is. particles with more thermal energy have higher temperatures. thermal energy comes from the kinetic energy of a substance. so the more kinetic energy the  object possess, the more thermal energy they will have.

when a particle moves faster, it gains kinetic energy. this means its thermal energy increases and therefore its temperature increases.

Answer: Does the animal prey on other animals? Is the animal a carnivore?

Answer:

\(\boxed{\text{0.25 \% H, 43.96 \% O, 4.75 \% F, 20.22 \% Al, 21.05 \% Si, 9.77 \% K}}\)

Explanation:

The oxide formula is (KF)₂(Al₂O₃)₂(SiO₂)(H₂O).

Rewrite it as a molecular formula — H₂O₂₂F₂Al₆Si₆K₂

The formula for the mass percent of an element is

\(\text{Mass \%} = \dfrac{\text{mass of element}}{\text{mass of compound}} \times 100 \, \%\)

We can set up a table to calculate the percent of each element.

\(\begin{array}{rrrrr}\textbf{Atom} & \textbf{No.} &\textbf{MM/u} & \textbf{Mass/u} & \mathbf{\%} \\\text{H} & 2& 1.01 & 2.02& 0.25 \\\text{O} &22 & 16.00 & 351.98 & 43.96 \\\text{F} & 2 & 19.00 & 38.00 & 4.75 \\\text{Al} & 6 & 26.98 & 161.89 & 20.22 \\\text{Si} & 6 & 28.08 & 168.51 & 21.05 \\\text{K} & 2 & 39.10 & 78.20 & 9.77 \\& & \text{TOTAL =} & \mathbf{800.60} & \mathbf{100.00} \\\end{array}\\\)

\(\text{The percent composition of muscovite mica is}\\ \boxed{\textbf{0.25 \% H, 43.96 \% O, 4.75 \% F, 20.22 \% Al, 21.05 \% Si, 9.77 \% K}}\)

Answer:

Percent yield = 17.3%

Explanation:

The percent yield is defined as 100 times the ratio between actual yield in grams and theoretical yield in grams (123g).

Percent Yield = Actual Yield / Theoretical yield (123g) * 100

To find actual yield we need to convert the 0.209moles to grams:

Actual yield -Molar mass Al2O3: 101.96g/mol-

0.209mol * (101.96g/mol) = 21.3g

Percent yield = 21.3g / 123g * 100

Percent yield = 17.3%

5 electron orbits

I hope this helps

Lewis dot structures are diagrams that depict the interactions between atoms in molecules as well as any lone pairs of electrons that may be present.

A Lewis electron dot diagram, also known as an electron dot diagram, Lewis diagram, or Lewis dot structure, is a diagram that employs dots to represent the valence electrons of an atom. The number of dots corresponds to the atom's valence electron count.

By including lines between atoms to represent shared pairs in a chemical bond, Lewis structures expand on the idea of the electron dot diagram.

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On the basis of the information above, the binary compounds in order of increasing bond polarity are CH4 < SiCl4 < SF4.

Binary compounds are forms of compounds that are processed from two elemental components. The elements that can form binary compounds can be metal elements and non-metallic elements. In addition, the constituent elements can also come from both.

The elements of a binary compound are:

Non-Metal Elements: C,H,O,N,S,P,F,Cl,Br,I,At,B,Be etc.

Elements Metals Similar oxidation numbers : IA : Li, Na, K, Rb, Cs, Fr and IIA : Be, Mg, Ca, Sr, Ba, Ra and Al, Zn, Ag and so on.

Metal elements with more than one oxidation number: Fe, Cu, Cr, Co, Ni, Pb, Sn, V, Mn, Hg, Pt, Au, Sc, Ti, and so on.

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Answer:

  0.2 M

Explanation:

The molarity is the number of moles per liter:

  (0.05 moles)/(0.25 liter) = 0.2 moles/liter = 0.2 M

Answer:

Observation

Explanation:

Observation is the first step in scientific method. First of all you observe anything or any activity.

Then you think about how it is going this way. If it happens so and so what will happen... then perform experiments. Etc

Observation

Hypothesis

Theory

Experiments

Law

Answer:

2 hydrogen atoms and 1 oxygen atom.

Answer:

the answer is C.

Explanation:

this is because burning anything is going to change the make-up of the object

UN1449 is a UN number that is used to identify a specific hazardous material or substance during transportation. To determine the subsidiary class of UN1449, we need to consult the relevant Schedule 1 of the UN Model Regulations or the applicable national regulations.

The subsidiary class of a hazardous material is determined by its properties and characteristics, such as its physical state, chemical composition, toxicity, flammability, and reactivity. These properties help to identify the potential risks and hazards associated with the material and inform the appropriate measures for safe handling, storage, and transport.

In general, the subsidiary class of a hazardous material is indicated by a numerical code following the primary class, such as Class 3, Flammable Liquids, Packing Group II (UN1263). However, the exact classification and labeling requirements for hazardous materials depend on various factors, including the mode of transport, quantity, packaging, and destination.

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F=ma

(a) when the mass of an object is fixed , measure the relationship between external force F and acceleration a.

(b) when the external force F. fixed , measure the relationship between mass of the moving object m and it's acceleration a .

Thank you.......Hope it will helps you

Can I get brainlist..........

Answer:

a) SN1/H2O

b) SN1/CH3OH

c)SN2/DMF

d)SN2/HMPA

Explanation:

The reactions are shown in the image attached.

Let me restate the basic facts about SN1 and SN2 reaction mechanisms. SN1 reaction occurs by unimolecular mechanism and involves a carbocation, a poor nucleophile and a polar protic solvent.

An SN2 reaction is a bimolecular synchronous reaction that passes through a single transition state. It requires a good nucleophile and a polar aprotic solvent.

For reaction a and b, we  observe that the alkyl halide is tertiary hence the reaction occurs by SN1 mechanism in the presence of a polar protic solvent.

Reactions c and d involves primary and secondary alkyl halides respectively and good nucleophiles. The best solvents to be used are polar aprotic solvents and the reaction follows SN2 mechanism.

Answer:

d. 20 protons and 22 neutrons

Atomic nuclei containing 20 protons and 22 neutrons. Thus, option D is correct.

An electron is defined as a subatomic particle which is charged negatively either bound to an atom or not it means free. The nucleus of an atom is made up of electron, proton and neutron. The electron is a basic particle and electron is not made of anything.

The nature of electron is free it means they are present freely in nature and consist of an atom.The main function of electron is that they play the role of negatively- charged component of an atom.

The electrons are primary source of current conducting and electrons number as well as atomic number of an element is always same or equal. There is no size of electron but the mass of electron is 9×10^-31.

Therefore, Atomic nuclei containing 20 protons and 22 neutrons. Thus, option D is correct.

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Answer:

The answer is in the problem

Explanation:

As general rule of number of oxygen is -2:

O → -2

Alkali metals (Li, Na, K) are always +1

Na → +1

Alkali earth methals (Be, Mg, Ca...) are always +2

Ca → +2

The halogen group (F, Cl, Br...) is always -1

F → -1

The oxidation number of Si (+/- 4)

Aluminium is, usually +3

And to complete the octet rule in nitrogen, 3 electrons are required. That means:

N → -3

Answer:The colour and distribution of the organism's biochromes

Explanation:

The colour and distribution of the organism's biochromes (pigments), particularly the relative location of differently coloured areas; the shape, posture, position, and movement of the organism; and the quality and quantity of light striking the organism

Change in temperature when quicklime reacts with water.

When ice cubes are separated from the freezer and conducted to room temperature, they turn into a liquid. This temperature is the boiling point of water. Heat makes water molecules move fast. Cooling air causes water vapor to change to a liquid. Water changes rapidly into a gas when water is heated to a temperature of 100 degrees Celsius or 212 degrees Fahrenheit.

When energy is free in an exothermic reaction, the temperature of the reaction mixture increases. When energy is soal up in an endothermic reaction, the temperature decreases.

So we can conclude that Some chemical reactions are distinguished by changes in temperature.

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At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

1: Write the balanced chemical equation:

\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)

2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.

Initial:

\(C_O\)(g) = 0.3500 mol

\(Cl_2\)(g) = 0.05500 mol

\(C_OCl_2\)(g) = 0 mol

Change:

\(C_O\)(g) = -x

\(Cl_2\)(g) = -x

\(C_OCl_2\)(g) = +x

Equilibrium:

\(C_O\)(g) = 0.3500 - x mol

\(Cl_2\)(g) = 0.05500 - x mol

\(C_OCl_2\)(g) = x mol

3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:

Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]

4: Substitute the given equilibrium constant (Kc) value into the expression:

1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)

5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:

1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x

6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.

7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.

8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):

\(Cl_2\)(g) = 0.05500 - x

9: Calculate the value of \(Cl_2\)(g) at equilibrium:

\(Cl_2\)(g) = 0.05500 - x

\(Cl_2\)(g) = 0.05500 - (positive value of x)

10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.

Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

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Answer:

A. The solubility of a gaseous solute is decreases at a higher temperature, and the CO₂ pressure in the can is increased.

B. When the can of warm soda is opened, more CO₂ is released, producing more spray.

Explanation:

We know that , solubility of the gases is inverse proportional to the temperature and directly proportional to the pressure .

We also know that , the kinetic energy of the gases is directly proportional to the temperature of the gas. If the temperature of the gas increase then the kinetic energy of gas will increases that increasing in the kinetic energy of the gas leads to decrease in the solubility of the gases.

When the pressure of the gas increases then the solubility of the gases also will increases because molecule of the gas try to settle in the small area.

From the above we can filled the below blank places

A. The solubility of a gaseous solute is decreases at a higher temperature, and the CO₂ pressure in the can is increased.

B. When the can of warm soda is opened, more CO₂ is released, producing more spray.

Answer:

The characteristics of cathode rays do not depend upon the material of electrodes and the nature of the gas present in the cathode ray tube.

According to the concept of redox reactions, the answer to this question is option C.

When the cell potential is positive. A redox reaction is spontaneous when the cell potential is positive.The cell potential is the measure of the driving force of the chemical reaction occurring in the electrochemical cell. In an electrochemical cell, a redox reaction occurs, which leads to the production of an electric potential.

If this potential is positive, then the redox reaction is considered spontaneous. However, if the potential is negative, then the reaction is non-spontaneous.In general, a redox reaction is spontaneous if the potential difference between the two electrodes of the cell is positive. This means that the reaction will occur spontaneously without any external energy input.

Thus, the correct option is C.

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Answer:

Although you might think of a machine as complex system of gears, drive belts and and a motor, the definition physicists use is much simpler. A machine is simply a device that does work, and there are only six different types of simple machines. They include the lever, the pulley, the wheel and axle, the screw, the wedge and the inclined plane.

Explanation:

The maximum mass of water that could be produced by the chemical reaction is 162 g.

The given chemical equation is: 2 C8H18(l) + 25 O2(g) → 16 CO2(g) + 18 H2O(l)In the chemical reaction of liquid octane with gaseous oxygen, the products are gaseous carbon dioxide and gaseous water.According to the balanced chemical equation, 2 moles of C8H18 react with 25 moles of O2 to form 18 moles of H2O.So, 1 mole of C8H18 react with 25/2 = 12.5 moles of O2 to form 9 moles of H2O.The molar mass of C8H18 is 114 g/mol. So, the number of moles in 17 g of C8H18 is:17 g / 114 g/mol = 0.149 molThe molar mass of O2 is 32 g/mol. So, the number of moles in 112 g of O2 is:112 g / 32 g/mol = 3.5 molFrom the balanced chemical equation, 1 mole of C8H18 react with 12.5 moles of O2 to form 9 moles of H2O.So, the number of moles of O2 required to react with 0.149 mol of C8H18 to form H2O is:(12.5 mol / 1 mol) × (0.149 mol / 2 mol) = 0.935 molThe maximum number of moles of H2O that can be produced from 0.149 mol of C8H18 and 0.935 mol of O2 is 9 mol.So, the mass of water produced from 17 g of C8H18 and 112 g of O2 is:9 mol × 18 g/mol = 162 g

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Answer:

copper metal and steel metak

Answer:

Every element to the left of the staircase on the Periodic Table is a metal, excluding Hydrogen, and everything to the right of that staircase is a non-metal.

Explanation:

The student needs to add approximately 83.3 mL of 12 M HCl solution to the existing 1 L of 2 M HCl solution to increase the concentration to 3 M. It is important to handle concentrated acids with caution and follow proper safety procedures.

To increase the concentration of a 1 L solution of 2 M HCl to 3 M, the student needs to calculate the volume of concentrated HCl needed and add it to the existing solution. Here's how the calculation can be done:

Given:

Initial concentration of HCl solution = 2 M

Final concentration desired = 3 M

Initial volume of HCl solution = 1 L

Step 1: Calculate the moles of HCl in the initial solution.

Moles of HCl = Initial concentration × Initial volume = 2 M × 1 L = 2 moles

Step 2: Calculate the moles of HCl needed for the desired concentration.

Moles of HCl needed = Final concentration × Final volume = 3 M × 1 L = 3 moles

Step 3: Calculate the moles of HCl to be added.

Moles of HCl to be added = Moles needed - Moles present = 3 moles - 2 moles = 1 mole

Step 4: Convert the moles of HCl to the required volume of concentrated HCl.

To calculate the volume, we need to know the concentration of the concentrated HCl solution. Assuming it is 12 M, we can use the following formula:

Volume of concentrated HCl = Moles of HCl to be added / Concentration of concentrated HCl

Volume of concentrated HCl = 1 mole / 12 M = 0.0833 L or 83.3 mL

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