Complete the following statements to describe solids, liquids, and gases. Select the correct answer from each drop-down menu.

A solid
has
a definite volume and
has
a definite shape.
A liquid
has
a definite volume and
does not have
a definite shape.
A gas
has
a definite volume and
does not have
a definite shape.

a usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance: The formation of rust on iron is a chemical change. Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

Answer:

A

Explanation:

the answer is a because the sun cannot stop burning but will rather burn hotter Then decay amongst the atoms in space

Answer:

D

Explanation:

If delta G at standard conditions is positive, then the reaction will always be nonspontaneous in the forward direction.

If the new solution has a concentration of 0.5 M, then the volume of the solution is 997mL.

Required volume of the new solution will be calculated by using the below equation as:

M₁V₁ = M₂V₂, where

M₁ & V₁ are the molarity and volume of initial HCl solution.

M₂ & V₂ are the molarity and volume of final HCl solution.

On putting values from the question, to the above question we get:

V₂ = (12.1)(41.2) / (0.5) = 997 mL

Hence resultant volume of the final solution is 997 mL.

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Answer:

N2020

Explanation:

I’m not fully sure but I’m pretty sure it’s wrong

Answer:

3 atoms

Explanation:

A water molecule consists of three atoms an oxygen atom and two hydrogen atoms which are bond together like little magnets

Explanation:

Exothermic reactions are those reactions in which heat is released.

Reactants→products+heat

For example, formation of ammonia from nitrogen and hydrogen is an exothermic reaction.

N2(g)+3H2(g)→2NH3(g)+92.2kJ

Endothermic reactions are those reactions in which heat is absorbed.

Reactants+heat→products

For example, dissociation of ammonia into nitrogen and hydrogen is an endothermic reaction.

2NH3 (g)+92.2kJ→

N2(g)+3H2(g)

In a redox chemical reaction, one species gets reduced and another gets oxidized. Manganese element is reduced in this reaction.

In a redox reaction, the increase or decrease in the oxidation number and electrons results in the reduction and oxidation of the chemical species. The oxidation and reduction occur simultaneously in a reaction.

The oxidation number of Mn in permanganate ion was +8 on the left side and decreased to +4 on the right side of the equation. Potassium permanganate is an oxidizing agent that has reduced the manganese ion of the permanganate ion.

Therefore, manganese is reduced.

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The hydrogen chloride is a gas at room temperature due to the presence of weak intermolecular forces.

Hydrogen chloride (HCl) is a chemical compound in which polar covalent bond is present between hydrogen atom and chlorine atom.

This bond is not so strong enough to maintain the stability in the liquid phase, else they are weak intermolecular forces and easily gets break through small amount of energy and having low boiling point. That's why HCl is present in gaseous state at room temperature.

Hence due to weak intermolecular force, HCl is present in gaseous state.

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Answer:

1.39

Explanation:

1060 mm   /  760 mm/atm = 1.39   atm

The law of conservation of mass is must be applied when cooking.

Law of conservation of mass states that mass of any substance will change into another form without any loss of mass, means destroying of mass is impossible.

When we cook food then mass of conservation is applied there, for example we are boiling pulses with water then in that case the amount of formed liquid pulses is equal to the initial mass of solid pulse with water.

Hence law of conservation of mass is applicable during cooking.

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The scientific question that is being asked by the archeologist is the age of the sample.

A scientific question is a question that can be answered empirically. That is, the question can be answered through an experiment.

Given the explanation in the question, the scientific question that is being asked by the archeologist is the age of the sample.

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Balanced chemical equation for the given reaction is Fe₂(CO₃)₃ + 6Cs → 3Cs₂CO₃ + 2Fe.

Balanced chemical equations are those equations in which all entities are present in equal amount on reactant side as well as on product side.

Given balanced chemical reaction is:
Fe₂(CO₃)₃ + 6Cs → 3Cs₂CO₃ + 2Fe

Above given equation is a balanced chemical equation where all atoms of reactant as well as of products are present in same amount.

Hence, required balanced equation is Fe₂(CO₃)₃ + 6Cs → 3Cs₂CO₃ + 2Fe.

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Answer:

Radium

Explanation:

Radium is a radioactive element which was often put in beauty products.

Answer:3.5 days is awfully precise and waxing gibbous is awfully vague.Let’s just make sure we understand our terminology. Waxing means getting fatter and gibbous means fat. A waxing gibbous moon lasts for approximately 7 days from the first quarter phase right up to the full moon phase.By 3.5 days I’m assuming you mean half a week and simplifying the lunar phases to 28 days exactly.So we have:Day 0 New moon.Day 7 First quarter.Day 14 Full moon.Day 21 Third quarter.Day 28 New Moon.Between day 0 - 7 we have the waxing crescent phase.Between day 7–14 we have the waxing gibbous phase.Between day 14–21 we have the waning gibbous phase.Between day 21–28 we have the waning crescent phase.So 3.5 days from day 7 would take us to day 10.5 which would still leave us in the waxing gibbous phase. 3.5 days after day 10.5 would take us to the full moon or over into the waning gibbous phase since the full moon lasts only an instant.

Explanation:

Waning gibbous​ is the lunar phase which will occur about four days after a waxing crescent. Therefore, the correct option is option D.

The lunar phase and Moon phase is indeed the shape of the directly illuminated section of the Moon, which may be described quantitatively using areas and angles. The lunar month is typically 29.53 days as seen from Earth.

The four major phases (new moon, first quarter, full moon, and last quarter) and four minor phases are qualitatively described. The orbital locations of the Moon round Earth and Earth from around Sun fluctuate throughout the course of a synodic month (about 29.53 days), which causes a gradual change in the lunar phases. Waning gibbous​ is the lunar phase which will occur about four days after a waxing crescent.

Therefore, the correct option is option D.

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Hydrazine is a colourless fuming corrosive strongly reducing liquid base [tex]N_2H_4[/tex] used especially in fuels for rocket and jet engines. And [tex]2H_2[/tex](g) is used to prepare hydrazine. Hence, option B is correct.

[tex]N_2(g)+2H_2(g)[/tex] → [tex]N_2H_4(g)[/tex]

Hydrazine is a chemical compound with the formula [tex]N_2H_4[/tex]. It has an ammonia-like odour, but the properties are more similar to water.

Chemical equation of the formation of hydrazine:

[tex]N_2(g)+2H_2(g)[/tex] → [tex]N_2H_4(g)[/tex]

Hence, option B is correct.

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Answer:

it is regurgitated and an owl pellet

Answer:

.00000005 C       or     50 x 10^-9 C

Explanation:

Like charges   REPEL

k = 8.99 x 10^9   kg m^3 / s^2 C^2    ( they should have given units of this)

F = k q1q2/r^2      q1 = q2   so

F = k q^2 / r^2

9 x 10^-3    = 8.99 x 10^9  * q^2 /.05^2            (.05 m = 5cm)

q = .00000005 C

Answer:

a person with full of dignity and my best friend is now no more with me .

Molar concentration is the ratio of the moles and the volume. The volume of the solution that is needed is

Molarity or the molar concentration is the proportion of the moles of the solute to the volume of the solution in liters.

Given,

The molar concentration of the solution = 0.450 mol/L

Moles of sodium nitrite = 0.300 moles

Volume is calculated as:

[tex]\begin{aligned} \rm volume &= \rm \dfrac{moles}{molarity}\\\\&= \dfrac{0.300}{0.450}\\\\&= 0.666 \;\rm L\end{aligned}[/tex]

Therefore, 666 mL of volume is needed.

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Answer:

The reaction is exothermic.

Answer:

B

Explanation:

Answer:

Cl

Explanation:

Hydrocarbons are Carbon chains that contain at least one halogen (F, Cl, Br, I and At)

Cl is a halogen

(I got this right on the test too)

Answer:

physical

Explanation:

the snow caused the erosion.

Answer:

physical

Explanation:

Answer: increase

Explanation: as pressure is increased, equlilibrium shifts towards the side with less moles of gas.  

The hydronium ion concentration of a pH = 9.2 of solution is 6.3 × 10⁻¹⁰M.

pH of the solution is define as the negative logarithm of the concentration of the hydronium ion as:

pH = -log[H⁺]

Or [H⁺] = [tex]10^{-pH}[/tex]

Given that pH value = 9.2

On putting values, we get

[H⁺] = [tex]10^{-9.2}[/tex] = 6.3 × 10⁻¹⁰M

Hence required concentration of hydronium ion is 6.3 × 10⁻¹⁰M.

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