Which describes how technology has changed society?
A. There is less food available to people.
B. People live longer than they used to
O C. It is more difficult to move goods
O d. It is hard for people to communicate​

Answer:

d, the remains of an organism have to be 10,000 years old to be classified as a fossile:)

Answer:

(d)

Explanation:took the quiz

Answer:

Na+, O, C, Na

(Na+ has more ionization energy and Na has less ionization energy)

Answer:

don't trued the ebitly dude. rub

Answer:

Explanation:

E = (hc)/(λ)

E = (6.624x10^(-27))Js x ((3×10^8)ms^(-1)) /

(77.8x10^(-9)m)

E = 2.55 x 10^(-11) J

Answer: The rusting of iron is more of a disadvantage than an advantage. Rusting forms an iron oxide which is more brittle than the iron. It less resistance to environmental degradation and permeability by water and air, therefore cannot be used for coating.

Explanation: plzz mark as brainliest

Answer:

0.0012 mol/L.

Explanation:

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

Number of mole of AgNO₃ = 62.3 μmol

Volume = 50 mL

Molarity of AgNO₃ =?

Next, we shall convert 62.3 μmol to mole. This can be obtained as follow as follow:

1 μmol = 10¯⁶ mole

Therefore,

62.3 μmol = 62.3 × 10¯⁶

62.3 μmol = 62.3×10¯⁶ mole

Next, we shall convert 50 mL to L. This can be obtained as follow:

1000 mL = 1 L

Therefore,

50 mL = 50 mL × 1 L / 1000 mL

50 mL = 0.05 L

Finally, we shall determine the concentration of AgNO₃ in mol/L as follow:

Number of mole of AgNO₃ = 62.3×10¯⁶ mole

Volume = 0.05 L

Molarity of AgNO₃ =?

Molarity = mole /Volume

Molarity of AgNO₃ = 62.3×10¯⁶ / 0.05

Molarity of AgNO₃ = 0.0012 mol/L

Thus, the concentration of AgNO₃ is 0.0012 mol/L

Answer:

javier applied force how this helps

Answer:

Machical  Engery

Electrical Engery

Rhermal Engery  

Sound Energy  

Explanation:

Explanation:

There are five types of kinetic energy:

Thus, There are five types of kinetic energy

-TheUnknownScientist

Answer:

answer B

It shows the ratio of elements in the compound

Explanation:

Chemical formulas tell you how many atoms of each element are in a compound, and empirical formulas tell you the simplest or most reduced ratio of elements in a compound. If a compound's chemical formula cannot be reduced any more, then the empirical formula is the same as the chemical formula.

The statement which is true about the empirical formula is: It shows the ratio of elements in the compound. The correct option is B.

Empirical formula:

The empirical formula of a compound represents the simplest, most reduced ratio of the elements present in the compound.

The empirical formula represents the simplest whole-number ratio of atoms of each element present in a compound.

It is determined by dividing the subscripts of the compound's molecular formula by their greatest common divisor, which simplifies the ratio to its simplest form.

In the given empirical formula CzHs, "z" and "s" represent the subscripts indicating the number of carbon and hydrogen atoms, respectively.

Thus, the correct option is B.

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Answer:

its A

Explanation:

The only one that makes sense

Answer:

7.14%

Explanation:

From the question,

percentage by mass hydrogen in C₄H₈O₃ (h)   = mass of hydrogen present in C₄H₈O₃(m)/molar mass of C₄H₈O₃ (m')

h = (m'/m)×100..................... Equation 1

Given: m' = (14×4)+(1×8)+(16×3) = 56+8+48 = 112 g, m =  (1×8) = 8 g

Substitute these values into equation 1

h = (8/112)×100

h = 7.14%.

Hence the percentage of hydrogen in 70 g of C₄H₈O₃ is 7.14%

Answer: The molality of solution is 1.2 mole/kg

Explanation:

Molality of a solution is defined as the number of moles of solute dissolved per kg of the solvent.

[tex]Molality=\frac{n}{W_s}[/tex]

where,

n = moles of solute

[tex]W_s[/tex] = weight of solvent in kg

Given : 10 g of glycerol is present in 100 g of solution

moles of glycerol = [tex]\frac{\text {given mass}}{\text {molar mass}}=\frac{10g}{92g/mol}=0.108mol[/tex]

mass of water (solvent )= (100-10) = 90 g = 0.09 kg

Now put all the given values in the formula of molality, we get

[tex]Molality=\frac{0.108mol}{0.09kg}=1.2mole/kg[/tex]

Therefore, the molality of solution is 1.2 mole/kg

Answer:

8.44 atm

Explanation:

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

Initial volume (V₁) = 2.25 L

Initial temperature (T₁) = 350 K

Initial pressure (P₁) = 1.75 atm

Final volume (V₂) = 1 L

Final temperature (T₂) = 750 K

Final pressure (P₂) =?

The final pressure of the gas can be obtained as illustrated below:

P₁V₁/T₁ = P₂V₂/T₂

1.75 × 2.25 / 350 = P₂ × 1 / 750

3.9375 / 350 = P₂ / 750

Cross multiply

350 × P₂ = 3.9375 × 750

350 × P₂ = 2953.125

Divide both side by 350

P₂ = 2953.125 / 350

P₂ = 8.44 atm

Thus, the final pressure of the gas is 8.44 atm.

Answer:

=>A stack or sea stack is a geological landform consisting of a steep and often vertical column or columns of rock in the sea near a coast, formed by wave erosion.

Answer:

[H⁺] = 2.57x10⁻⁶ M

Explanation:

This problem can be solved using the definition of pH:

pH = -log[H⁺]

Now we isolate [H⁺] in the equation:

-pH = log[H⁺]

[tex]10^{-pH}[/tex]=[H⁺]

As we are given the pH by the problem, we can now proceed to calculate the [H⁺]:

[H⁺] = [tex]10^{-5.59}[/tex]

[H⁺] = 2.57x10⁻⁶ M

Thus, when the pH of a solution is 5,59; the molar concentration of H⁺ species is 2.57x10⁻⁶.

The best analogy that can be use to describe a wave is that a wave is like a rippling in a pond.

A wave is a disturbance or vibrations that occur in a particle and travel from one medium to another medium thereby transporting energy form the origin of it to another location where is is utilized.

Therefore, The best analogy of a wave is a wave is like water rippling in a pond.

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Answer:

[OH-] = 3.0 x 10^-19 M

Explanation:

[H3O+][OH-] = Kw

Kw = 1.0 x 10^-14

[H3O+][OH-] = 1.0 x 10^-14

[OH-] = 1.0 x 10^-14 / 3.3 x 10^4 = 3.0 x 10^-19

Potassium chloride

Iron (II) chloride

Copper (II) sulfate

Aluminum oxide

Iron (III) oxide

Remember to put roman numerals for the compounds where the metal has more than one possible oxidation state. For example, you see iron here with a +2 charge in one compound and then +3 charge in another. If the metal only has one possible oxidation state (like potassium and aluminum), you don't need a roman numeral.

less than the force of gravity from mars to earth

Answer:

Because the weather is complex and dynamic.

Explanation:

Answer:

Judges and justices serve no fixed term — they serve until their death, retirement, or conviction by the Senate. By design, this insulates them from the temporary passions of the public, and allows them to apply the law with only justice in mind, and not electoral or political concerns.

The two processes  which contributed oxygen to earth’s second atmosphere are photosynthesis and photolysis.

It is defined as a process by which plants and other photosynthetic organisms convert the light energy in to chemical energy  through the process of cellular respiration.

Some of the energy which is converted  is stored in molecules of carbohydrates like sugar and starches  which are made up of from carbon dioxide and water . Photosynthetic organisms which can perform photosynthesis  are algae and cyanobacteria. Photosynthesis is largely responsible for producing and maintaining the content of oxygen in earth's atmosphere.

The process begins with proteins absorbing light energy  which are called reaction centers and contain a green pigment which is called chlorophyll . In plants ,these pigments are present inside organelles called chloroplasts while in bacteria they are present in plasma membrane.

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Answer:

2.5 mL

Explanation:

Step 1: Given data

Step 2: Calculate the amount of the active ingredient in the medicine

The concentration of the active ingredient is 5% v/v, that is, there are 5 mL of the active ingredient per 100 mL of the medicine. The volume of the active ingredient is 50 mL of the medicine is:

50 mL Med × 5 mL AI/100 mL Med = 2.5 mL AI

Answer:

Yes

Explanation:

There are some times when I will need my cell phones but it will have not battery. At this point, I look for a means to charge it or I could probably use power bank to charge. I always have an extra battery, so when the other battery is flat, I will replace it with the second charged one. But when both batteries are flat, I will look for a means to charge it using generator or wait till I have access to power supply.

Answer:

a) alab

Explanation:

Two of the main macromolecules are proteins and nucleic acid, and a polysaccharide is multiple monomers (monosaccharide) that join to create another macromolecule called carbohydrates.

Answer:

It is exothermic in nature.

Explanation:

(1) The reaction is exothermic in nature because it releases heat energy.

(2)  Yes, the temperature of the water go up as the reaction releases heat energy and the temperature cool down as the heat energy is completely removed from the water.

(3)  The piston move in when the pressure in the cylinder decreases and the piston move out when increase of pressure occur.

 (4)  As the outside movement of piston occurs, so we can say that the gas mixture does work on its surroundings.

 (5)   The system released 244 kJ of energy, in which only 150 kJ went into the water, then the difference must be the work done by the system on its surroundings.

 W = (244 - 150) kJ = 94 kJ

Answer:

Explanation:The pi-molecular orbitals in propene (CH3-CH=CH2) are essentially the ... This central carbon thus provides two p-orbitals – one for each pi bond – and these two different p-orbitals have to be perpendicular, leading to a twisted structure as shown: ... It all comes down to where the location of the electron-deficient carbon  

Answer:

26

Explanation: