CHEMISTRY HIGH SCHOOL

Scientists think the earth is approximately _____ years old.2 billion
3 billion
4 ½ billion
6 ½ billion

Answers

Answer 1
Answer:

Answer is 4 ½ billion.

Scientists think the earth's age is 4 ½ billion. This calculation is based on the radioactive dating. Since the formation of the earth, the time period has been divided into 3 major geological time periods as eon. They are phanerozoic, proterozoic and archean.

Answer 2
Answer:

Final answer:

Scientists estimate that the Earth is approximately 4.5 billion years old based on radiometric dating and other lines of evidence.

Explanation:

The correct answer is 4 ½ billion years. Scientists believe that the Earth is approximately 4.5 billion years old based on evidence from radiometric dating of rocks on Earth and meteorites. Radioactive elements such as uranium and potassium decay into stable isotopes over time, and by measuring the ratio of parent isotopes to daughter isotopes in rocks, scientists can estimate the age of the Earth.

This estimation is supported by other lines of evidence, such as the age of the oldest rocks on Earth and the Moon, and the ages of meteorites. These findings suggest that the Earth formed shortly after the formation of the Solar System, which is estimated to be about 4.6 billion years old.

Therefore, the most accurate estimation is that the Earth is approximately 4.5 billion years old.

Learn more about Age of the Earth here:

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The practice of making operations "carbon neutral" is a way to offset whatever damage is being done to the environment due to greenhouse gas emissions by purchasing credits from "carbon-positive" projects to balance out emissions. True or false?

Which of the following is the correct molecular shape of NH3?А) bent
B) linear
C) tetrahedral
D) trigonal pyramidal

Answers

A bent


..........................................

25. In the formula for a molecular compound, which atom generally comes first? You may wentto refer to a periodic table.

Answers

Answer:

For organic compounds, carbon and hydrogen are listed as the first elements in the molecular formula, and they are followed by the remaining elements in alphabetical order. For example, for butane, the molecular formula is C 4 H 10.

Explanation:

The proper technique used to obtain a liquid sample using a pipette involves: Group of answer choices your mouth on one end of the pipette to suction the sample. a suction bulb or pipette pump to suction the sample. a funnel on one end of the pipette to add the sample. a small glassware to pour the liquid in one end of the pipette. the vacuum hose on one end of the pipette to suction the sample.

Answers

Answer:

A suction bulb or pipette pump to suction the sample.

Explanation:

There are different types of pipettes that can be used in a laboratory:

  • Volumetric pipette-used to transfer a specific calculated amount of liquid
  • Graduated pipettes-used to transfer different calculated amounts of liquid from one container to another.
  • Micropipettes-used to transfer small amounts of liquids
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The liquid-vapor equilibrium of a substance can be disturbed by cooling the substance.TRUE

FALSE

Answers

The statement "The liquid-vapor equilibrium of a substance can be disturbed by cooling the substance" is false. The substance must be heated in order to get the vapor phase of that substance.

When a 1.0 M solution of HCl is titrated with a 1.0 M solution of KOH, which is the approximate pH at the equivalent point?

Answers

The equivalence point is when the concentration of H⁺ in solution is equal to the concentration of OH⁻ in solution.  Since H⁺ and OH⁻ react with each other to make water (H⁺(aq)+OH⁻(aq)→H₂O(l)) the pH at the equivalence point is 7 due to everything being neutralized.  (The equivalence point only has a pH of 7 when a strong acid is being titrated with a strong base).

I hope this helps.  Let me know if anything is unclear.  

Answer:

Decreases abs basicity decrease

Explanation:

According to Table I, which equation represents a change resulting in the greatest quantity of energy released? 1. 2C(s) + 2H2(g) -> C2H4(g)
2. 2C(s)+3H2(g) -> C2H6(g)
3. N2(g) +3H2(g)->2NH3(g)
4. N2(g)+O2(g) -> 2NO(g)

Answers

Answer:

3. N2(g) +3H2(g)->2NH3(g)

Explanation:

Reactions can be broadly classified as endothermic and exothermic reactions. In the former, energy or heat is absorbed by the reactants and the enthalpy change of the reaction is positive. In the later, heat is released ans the enthalpy change of the reaction is negative.

For the given reactions, the enthalpy change or ΔH values are:

1. 2C(s) + 2H2(g) -> C2H4(g)        ΔH = +52.4 kJ

2. 2C(s)+3H2(g) -> C2H6(g)         ΔH = -84 kj

3. N2(g) +3H2(g)->2NH3(g)          ΔH = -91.8 kJ

4. N2(g)+O2(g) -> 2NO(g)            ΔH = +182.6 kJ

Reactions 1 and 4 are endothermic while reactions 2 and 3 are exothermic in which heat is released.

More negative the ΔH value, greater is the amount of heat released.

Thus, reaction 3, represents a change resulting in the greatest quantity of energy released
The answer is 3. The releasing of energy means exothermic reaction. So the ΔH should be negative. And the greatest quantity of energy released means that the greatest number. So according to the table I, the answer is 3.
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