Periodic table trivia crossword puzzle

Noble gases all share?

Answer:

0.01 mole

Explanation:

Answer:

[tex]\boxed {\boxed {\sf 4.8 \ M \ KCl}}[/tex]

Explanation:

The molarity of a solution is found by dividing the moles of solute by the liters. of solvent.

[tex]molarity=\frac{moles}{liters}[/tex]

We know the solution has 3.6 moles of potassium chlorine. We know there are 750 milliliters of solvent, but we need to convert this to liters.

Now we know the moles and liters, so we can calculate molarity.

Substitute these values into the formula.

[tex]molarity= \frac{3.6 \ mol \ KCl}{0.75 \ L}[/tex]

Divide.

[tex]molarity= 4.8 \ mol \ KCl/ L[/tex]

[tex]molarity= 4.8 \ M \ KCl[/tex]

The molarity of the solution is 4.8 M KCl.

Answer: An endothermic reaction occurred

Explanation:

A sample of a compound is added to distilled water in a clean beaker. A reaction occurs and the water temperature drops rapidly which indicates that an endothermic reaction occurred. Hence, option A is correct.

Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.

An endothermic reaction means that heat is absorbed during this reaction (enthalpy change value has a positive sign).

During the endothermic reaction heat is absorbed from the surroundings (here, water) and hence the temperature of the water in which the reaction is taking place decreases.

Hence, option A is correct.

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Answer:

The answer is B

Explanation:

Carbon dioxide is a chemical compound that consists of two oxygen atoms and one carbon atom. Carbon Dioxide (CO2) is a gas with a molecular structure composed of two oxygen atoms and one carbon atom.

Hope this helps!

Answer:

Carbon dioxide photosynthesis

Explanation:

During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil.

hope it helps

Answer:

A biotic factor is a living organism that shapes its environment. In a freshwater ecosystem, examples might include aquatic plants, fish, amphibians, and algae. Biotic and abiotic factors work together to create a unique ecosystem.

Answer:

A FWOGGY!

Explanation:

hey mid! how ya doin?

Answer:

water: H2O

Calcium Chloride: CaCl2

water and calcium chloride: Ca(OH)2 + HCl

Explanation:

CaCl2 + H2O = Ca(OH)2 + HCl

Answer:

Water is H20

Calcium Chloride is CaCI2

Answer:

Why hydrogen is the only non-metal elements which loses electron to form positive ions ? ... When hydrogen bonded with most electronegative element then it forms a positive ions but when it bonded with less electronegative element then it forms a negative ion.

Answer:

There is ionic bonding between Mg2+ ions and NO3− ions. Which of the following claims about a binary compound in which the bonding is ionic is most likely to be scientifically valid? Both elements in the compound are metals.

Answer:

The answer is D.

Explanation:

A: not correct: one element is a metal and the other is a non-metal.

B: not correct: Fr could be combined with Cl

C: not correct: They are transferred not shared.

D: correct: Non-metals have a higher electronegativity in comparison to the metals with a low electronegativity which results in a great change in electronegativity.

lanation:    

ExpErnest Rutherford’s experiments involving the interaction of radiation with a magnetic or electric field (Figure 2) helped him determine that one type of radiation consisted of positively charged and relatively massive α particles; a second type was made up of negatively charged and much less massive β particles; and a third was uncharged electromagnetic waves, γ rays. We now know that α particles are high-energy helium nuclei, β particles are high-energy electrons, and γ radiation compose high-energy electromagnetic radiation. We classify different types of radioactive decay by the radiation produced.

Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:

210

84

Po

⟶

4

2

He

+

206

82

Pb

or

210

84

Po

⟶

4

2

α

+

206

82

Pb

Visible Spectrum

Explanation:

which uses red shift to indicate objects making away while the blue shift indicates objects moving down.

Answer:

Explanation:

The pH of a solution can be found by using the formula

[tex]pH = - log ([ {H}^{+} ])[/tex]

From the question we have

[tex]pH = - log(3.33 \times {10}^{ - 7} ) \\ = 6.477555...[/tex]

We have the final answer as

Hope this helps you

Answer:

Conservation of resources. Saving energy and helping reduce carbon emission.

Explanation:

Answer: Hello, There! your answer is Below.

D. The formation of a solid from a liquid confirms that a physical

change took place.

Explanation:

The change from the liquid state to the solid state is called freezing. As the liquid cools, it loses thermal energy. As a result, its particles slow down and come closer together. Attractive forces begin to trap particles, and the crystals of a solid begin to form.

Hope this helps you!!!

Have a great day!!!

When a liquid undergoes solidification and change of phase it is called freezing. The physical change can be confirmed by changes in the state of matter from liquid to solid. Thus, option D is correct.

Physical changes are the modification in the matter or object that can be reversed back to its original state. They do not produce substances that are irreversible.

The change of the phase of the matter from liquid to solid when water substance undergoes freezing is a physical change as no new compound is created and the solidified substance can get converted back to liquid.

Therefore, option D. solid from liquid shows a physical change.

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Explanation:

Models do not behave exactly like the things they represent. Accuracy—In order to make models simplistic enough to communicate ideas some accuracy is lost. For example, ball and stick models of atoms do not show all the details that scientists know about the structure of the atom.

Modeling Benefits

Viewing systems from multiple perspectives.

Discovering causes and effects using model traceability.

Improving system understanding through visual analysis.

Discovering errors earlier and reducing system defects.

Exploring alternatives earlier in the system lifecycle.

Answer:

Fe2O3

Explanation:

Answer:

142.8096978mol

Explanation:

Answer:

Tsunami wave

Explanation:

lol 100% sure

Answer:

asxrsse367721479009qqucinübjpnpnfzdh ilo h

Answer:

1.75 moles are contained in 500 mL of a 3.5 M NaOH solution.

Explanation:

Molar concentration is a measure of the concentration of a solute in a solution, be it some molecular, ionic or atomic species and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution.

[tex]Molarity=\frac{number of moles of solute}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].

In this case:

Replacing:

[tex]3.5 M=\frac{number of moles of solute}{0.5 L}[/tex]

Solving:

number of moles of solute= 3.5 M*0.5 L

number of moles of solute= 1.75 moles

1.75 moles are contained in 500 mL of a 3.5 M NaOH solution.

Answer:

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Explanation:

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Answer:

31.08 atm.

Explanation:

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

Initial volume (V₁) = 0.60 L

Initial temperature (T₁) = 161 K

Final volume (V₂) = 14.1 L

Final temperature (T₂) = 297 K

Final pressure (P₂) = 2.44 atm

Initial pressure (P₁) =?

The initial pressure of the gas can be obtained as follow:

P₁V₁/T₁ = P₂V₂/T₂

P₁ × 0.6 / 161 = 2.44 × 14.1 / 297

P₁ × 0.6 / 161 = 34.404 / 297

Cross multiply

P₁ × 0.6 × 297 = 161 × 34.404

P₁ × 178.2 = 5539.044

Divide both side by 178.2

P₁ = 5539.044 / 178.2

P₁ = 31.08 atm

Thus, the initial pressure of the gas was 31.08 atm.

Answer:

500.00

Explanation:

400+20+50+49+17+59

Answer:

NH3 + H2O → NH4+ + OH-

Explanation:

Ammonia, NH3 can act as a base in water (H2O), which serves as the acid, as follows;

NH3 (aq) + H2O (l) → NH4OH (aq)

According to Bronsted–Lowry acid–base theory, NH4+ (ammonium) is the conjugate acid because it can lose hydrogen ion to form the base while OH- is the conjugate base because it can gain hydrogen ion to form the acid. The balanced ionic equation is as follows;

NH3 + H2O → NH4+ (aq) + OH- (aq)

Answer:

Spectroscopy — the study of the absorption and emission of light by atoms

Absorption spectrum — represents energy absorbed as dark bands

Atomic spectrum — represents energy emitted or absorbed

during electron jumps

Emission spectrum — represents energy emitted as colored lines

Explanation:

Spectroscopy is an analytical technique to study and analyze using spectrum. It has been the absorption and emission of other light by the atoms. The correct matches are A.1, B. 2, C.3, and D.4.

Spectroscopy is the technique used in chemistry where matter absorbs and emits radiations of a certain wavelength. The absorption spectrum is used to represent absorbed energy in the form of dark bands or lines. Thus, options A.1 and B.2 are correct.

The atomic spectrum is characterized by the black-colored bands that depict the energy absorbed and emitted by an excited atom during electron transitions. Whereas, the emission spectrum shows the colored lines that is the energy emitted when an electron transits from higher to lower energy levels. Thus, options C.3 and D.4 are correct.

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C-4 or Composition C-4 is a common variety of the plastic explosive family known as Composition C, which uses RDX as its explosive agent. C-4 is composed of explosives, plastic binder, plasticizer to make it malleable, and usually a marker or odorizing taggant chemical.

Or

The explosive material in C-4 is cyclotrimethylene-trinitramine (C3H6N6O6), commonly called RDX (which stands for "royal demolition explosive" or "research development explosive").

Explanation:

when the water evaporates the substance is left behind

Answer:

94.4mg is the answer.

Explanation:

mass of gold = 0.175g = 175mg

no. of moles = given mass / relative atomic mass

n = 175/197

n = 0.888 mol.

From the equation, mole ratio of Gold to Chlorine is 2:3

moles of chlorine = 1.5 × 0.888 = 1.33

no. of moles (chlorine) = mass/(35.5 × 2)

1.33 = m/71

m = 94.4mg

∴ mass of chlorine = 94.4mg

Answer: The new pressure is 3 psi.

Explanation:

Given: [tex]P_{1}[/tex] = 12 psi,         [tex]T_{1} = 20^{o}C[/tex]

[tex]P_{2}[/tex] = ?,          [tex]T_{2} = 5^{o}C[/tex]

Formula used is as follows.

[tex]\frac{P_{1}}{T_{1}} = \frac{P_{2}}{T_{2}}\\\frac{12 psi}{20^{o}C} = \frac{P_{2}}{5^{o}C}\\P_{2} = \frac{12 psi \times 5^{o}C}{20^{o}C}\\= 3 psi[/tex]

Thus, we can conclude that the new pressure is 3 psi.