What kind of crystalline solid is copper?
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Answer:

Explanation:

please mark as brain and like please

Answer:

True

Explanation:

Answer:

color of water remains same

Answer:

Hydrocarbons

Explanation:

They all are made up of only carbon and hydrogen atoms, so they're organic molecules known as hydrocarbons. Decane and Heptane are alkanes, Propene is an alkene.

Explanation:

like all metals,calcium carbonate reacts with acidic solution to produce carbon dioxide

Answer:

4K + O₂ → 2K₂O

Los reactivos son: Potasio, Oxígeno, y óxido de potasio

Explanation:

El elemento químico número 19 es el potasio, un metal alcalino (Los metales alcalinos tienen estado de oxidación +1).

El óxido correspondiente debe tener fórmula K₂O (Oxígeno con carga -2 y 2 átomos de potasio con carga +1 dan el óxido neutro). La reacción es:

Answer:

the answer is

Explanation:

number of mollecoles

In chemistry a coefficient denotes the number that is seen in front of the formula of a equation. The coefficient in the given equation 4CO₂ is 4.

A number which precedes the formulas of reactants and products in order to balance a chemical equation is defined as a coefficient. It represents the number of atoms or molecules of each elements which are present in the reaction.

A chemical equation should be balanced and it must obey the law of conservation of mass which states that the number of reactants and products on both sides of the equation should be equal.

The coefficients are the numbers which are required to balance a chemical equation and it may vary while balancing a equation. The coefficient is found to be 1 if no number is mentioned in front of the formula of the reactants and products.

In the given equation 4CO₂, 4 is the coefficient which shows that 4 'C' atoms and 8 'O' atoms are present in the compound CO₂.

Thus the coefficient in the compound 4CO₂ is 4.

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Answer:

8.36 x 10^24 atoms/molecules

Explanation:

Avagadro's Number: 6.02214076 × 10^23

Avagadro's Number shows the number of molecules in 1 mole of substance. In this case, if there is 13.88 moles of lead, we multiply 13.88 by Avagadro's number:

(6.02214076 × 10^23)(13.88) = 8.358536 x 10^24 = 8.36 x 10^24

A second tidal bulge forms on the side of Earth opposite the moon because the moon's gravity pulls Earth away from the water, which is false as the second tidal bulge is not caused by the moon's gravity pulling the Earth away from the water but rather is a result of the centripetal force caused by the rotation of the Earth-Moon system.

Tidal bulges are caused by the gravitational forces of the moon and the sun on the Earth's oceans. The gravitational force of the moon is stronger on the side of the earth facing the moon than on the side facing away from the moon. This creates a tidal bulge on the side of the earth facing the moon. However, there is also a second tidal bulge that forms on the side of the earth opposite the moon.

Hence, a second tidal bulge forms on the side of Earth opposite the moon because the moon's gravity pulls Earth away from the water, which is false as the second tidal bulge is not caused by the moon's gravity pulling the Earth away from the water but rather is a result of the centripetal force caused by the rotation of the Earth-Moon system.

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Answer:

A

Explanation:

Most of the world's active volcanoes are located along or near the boundaries between shifting plates and are called "plate-boundary" volcanoes.

Answer:

4.00

Explanation:

Answer:

Las fuentes de luz primarias son aquellas que emiten la luz que producen. Por ejemplo: la luz de Sol, un relámpago, la de una vela,...

A su vez las fuentes primarias las podemos clasificar en: fuentes naturales y fuentes artificiales

Explanation:

Answer:

See Explanation

Explanation:

Genetic mutation refers to the alteration of the sequence of bases in the gene of an organism. Recall that the gene contains sensitive information about the characteristics of an organism.

There are three types of genetic mutation which includes; base substitutions, deletions and insertions.

Using the analogy of the baker stated in the question, if he forgets to add something, then a part of the recipe has been deleted. This is analogous to the omission or deletion of a base in the sequence leading to mutation.

An additional or extra ingredient may be added to the recipe. This is analogous to insertion of a new base into the sequence leading to mutation.

If the baker adds a wrong ingredient instead of what he is supposed to add, this is analogous to substitution of a base by another leading to mutation.

In each of these cases, the taste of the cookies is marred. The baker can never produce the same taste of cookies exactly as described by the recipe book. This means that insertions, deletions and substitution of bases produce a new genetic code that is different from the original genetic code. This is referred to as genetic mutation.

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While balancing the chemical equations, the sub scripts aren't changed because by changing sub script we actually change the compound formed, hence coefficients are changed so the compound remains the same.

for example : ( for understanding )

in balancing the given reaction,

H2 + O2 =》H2O

if we change Oxygen's sub script in " H2O "

we get,

H2O + O2 =》H2O2

but here the compound formed isn't water, it is "H2O2" (hydrogen peroxide), so we can't change the sub script.

but by changing the coefficient, we get :

2 H2 + O2 =》2 H2O

Answer:

Explained below

Explanation:

They are different simply in terms of how they are formed. An intrusive igneous rock is formed as a result of magma being pushed into the rock right below the earth's surface while an extrusive rock is formed as a result of lava erupting onto the surface of earth.

Both rocks are similar in terms of appearance because they both have crystals. Intrusive has large crystals while extrusive has small crystals.

Explanation:

[tex]CH _{3}CH _{2}COOCH _{2} CH _{2}CH _{2}CH _{2}CH _{2}CH _{3}[/tex]

NAME: Hexylpropenoate

Answer:

B.

Explanation:

Answer: The pH of given solution is 2.3

Explanation:

It is given that the concentration of HCl solution is 0.005 M.

pH is the negative logarithm of concentration of hydrogen ions.

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

Substitute values into the above formula as follows.

[tex]pH = -log [H^{+}]\\= - log (0.005)\\= 2.3[/tex]

Thus, we can conclude that the pH of given solution is 2.3

Answer: A

Explanation:

A

Heat is the product of the mass, specific heat, and delta temperature. The gold metal will reach the highest temperature. Thus, option A is correct.

Specific heat (c) is the heat required by a substance to get heated a unit mass by a unit of temperature. The specific heat is given as,

[tex]\rm c = \rm \dfrac{Q}{m \times \Delta T}[/tex]

Here, Q is the heat applied, m is the sample's mass and delta T is the change in the temperature.

The value of heat applied is the same for all the metals, so a change in temperature is calculated as,

[tex]\rm \Delta T = \rm \dfrac{Q}{c . m }[/tex]

From this, it can be said that the temperature is inversely related to the specific heat of the metal and hence the metal having the smallest c will have the highest change in the temperature.

Therefore, gold (c = 0.129 J/(g°C)) will reach the highest temperature.

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Answer:

Explanation:

pH = -log{H+]

{H+} = 10^(-pH)

pOH = 14 - pH

{OH-} = 10^(-pOH)

pH 2.90 (the approximate pH of lemon juice

{H+} = 10^(-2.9)

pOH = 14 - 2.9 = 11.1

{OH-} = 10^(-pOH) = 10^(-11.1)

pH 3.86 (the approximate pH of sauerkraut)

{H+} = 10^(-3.86)

pOH = 14 - 3.86 = 10.14

{OH-} = 10^(-pOH)  = 10^(-10.14)

pH 10.81 (the approximate pH of milk of magnesia)

{H+} = 10^(-10.81)

pOH = 14 - 10.81 = 3.19

{OH-} = 10^(-pOH) = 10^(-3.19)

pH 4.11 (the approximate pH of orange juice)

{H+} = 10^(-4.11)

pOH = 14 - 4.11 = 9.89

{OH-} = 10^(-pOH) = 10^(-9.89)

pH 11.61 (the approximate pH of household ammonia)

{H+} = 10^(-11.61)

pOH = 14 - 11.61 = 2.39

{OH-} = 10^(-pOH)  = 10^(-2.39)

Explanation:

Ductility is the ability of a material to be drawn or plastically deformed without fracture. It is therefore an indication of how ‘soft’ or malleable the material is. The ductility of steels varies depending on the types and levels of alloying elements present. An increase in carbon, for example, will increase the strength but decrease the ductility.

Answer:

ductility of a metal able to be drawn out into a long thin wire.

Answer:

It is C

Explanation:

it sends signals to the brain so it would be C

Answer:

C. The nervous system controls everything you do, including breathing, walking, thinking, and feeling.

is the answer

Answer:

I think D

Explanation:

Kinetic energy has a direct relationship with mass, meaning as mass increases so does the kinetic Energy of an object.

Answer:

b, and d

Explanation:

because it makes the most sense I might be wrong

Answer:sorry

Explanation:

Answer:

C

Explanation:

C, because unlike A and B, it's an improvement in human population. And D wouldn't really be classified as an improvement as it states "Population has not decreased or increased significantly."

Answer:

An increase in entropy

Explanation:

Doing the same question hope this helps

Answer:

331.2 g/molExplanation:

The molar mass of lead nitrate (Pb(NO₃)₂) is 331 g. Therefore, option B is correct.

The atomic mass of lead (Pb) is 207.2 grams per mole.

The atomic mass of nitrogen (N) is 14.0 grams per mole.

The atomic mass of oxygen (O) is 16.0 grams per mole.

In lead nitrate, 2 nitrate ions (NO₃), so multiply the atomic mass of nitrogen by 2 and the atomic mass of oxygen by 6 (since there are 3 oxygen atoms in each nitrate ion):

2(N) + 6(O) = 2(14.0 g) + 6(16.0 g)

= 28.0 g + 96.0 g

= 124.0 g

Pb(NO₃)₂ = 207.2 + 2(14.01 + 3(16.00))

= 207.2 + 2(14.01 + 48.00)

= 207.2 + 2(14.01 + 48.00)

= 207.2 + 2(62.01)

= 207.2 + 124.02

= 331 g

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Answer:

Solution A is 1,000 times more acidic than Sol. B

Explanation:

for pH values we use scientific notation:

-log10 c (where c is the hydrogen ion concentration) is used to notate pH value (think of it as a unit)

ie:

10^-2 is sol A 10^-5 is sol B

5-2 is 3

10^-3 = 1000

there's a diff of 1,000 between the solutions.

The acidity or alkalinity of a solution depends on the hydronium ion concentration and hydroxide ion concentration. Here the solution A of pH 2.0 is more acidic than the solution of pH 5.0.

The pH of a solution is defined as the negative logarithm to the base 10 of the value of the hydronium ion concentration in moles per litre. When the pH of the solution is less than 7 it is acidic whereas when pH is greater than 7, it will be basic.

The pH of the solution is calculated by the equation:

pH = - log [H₃O⁺]

Then the concentration of H₃O⁺ is:

[H₃O⁺] = 10⁻pH

At pH = 2.0, [H₃O⁺] = 10⁻² = 0.01

At pH = 5.0, [H₃O⁺] = 10⁻⁵ = 0.00001

Thus here the Solution A is 1,000 times more acidic than Solution B.

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Answer:

The total atoms present in the chemical formula is 13

Explanation: