CHEMISTRY HIGH SCHOOL

The elements in the middle of the periodic table are known as:a. Noble elements
c. Transition elements
b. Heavy metals
d. Covalent elements

Answers

Answer 1
Answer:

Answer:

The correct answer is c. Transition elements

Explanation:

Transition elements are often called transition metals and are located in the middle of the Periodic Table, in the d-block (because they have an incomplete d-orbital). They are all metals, for example: iron (Fe), copper (Cu), titanium (Ti), etc, and they have high melting and boiling points.

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Based on enthalpy of formation data species ∆H◦ f H2S(g) −20.63 kJ/mol O2(g) 0 kJ/mol H2O(ℓ) −285.83 kJ/mol SO2(g) −296.83 kJ/mol calculate ∆Hrxn for 2 H2O(ℓ) + 2 SO2(g) ←→ 2 H2S(g) + 3 O2(g) 1. 562 kJ · mol−1 2. −562 kJ · mol−1 3. −1124 kJ · mol−1 4. 1124 kJ · mol−1

Carrying capacity is _____.the ratio of predators to prey
the number of populations in a specific area
the number of organisms in a population
the number of organisms an ecosystem can support

Answers

Carrying capacity is the number of organisms an ecosystem can support. It is the maximum size of a population that can survive in the ecosystem. If the animals reach the carrying capacity, the population may crash. As the consequence, the number of animals will decrease due to predators or diseases.

The answer is: number of organisms an ecosystem can support.

A chemist has dissolved a certain substance in water. The chemist knows that more of the substance could be dissolved into the water before it stops dissolving. Therefore, the current solution is

Answers

Answer is: the current solution is unsaturated.

Unsaturated solution means that more of a substance can be dissolve.

For example:

Solubility of potassium chlorate (KClO₃) at 100 grams of water at 80°C is 37.5 g, that means that all 37.5 g is completely dissolves, this is the saturated solution.

If we add 20 grams of potassium chlorate in 100 grams of water, there is less solute than the saturated solution, so this is unsaturated solution.

The current solution is \boxed{{\text{unsaturated}}}.

Further explanation:

The maximum amount of solute particles that can be dissolved in fixed amount of solvent to form a saturated solution is called solubility of a salt. The units of solubility are often expressed as {\text{g}}/100{\text{ mL}}. Depending upon solubility the solution can be of three types:

1. Saturated solution

2. Unsaturated solution

3. Supersaturated solution

The saturated solution may be defined as a solution that has maximum amount of solute dissolved and that cannot accommodate any further solute. Such a solution has some undissolved substance at the bottom.

The unsaturated solution may be defined as the solution in which the solute concentration is smaller than the maximum amount that can be added and hence more amount can be easily added.

The supersaturated solution refers to the solution in which the solute concentration exceeds the maximum amount that can be added. Such a solution is prepared when a solution is heated to a certain temperature to dissolve this solute and then slowly cooled down to lower temperatures.

Since more solute can still be dissolved in the solution hence the current solution is unsaturated.

Learn more:

1. Determination of supersaturated solution: brainly.com/question/8834703

2. Type of mixture: brainly.com/question/11506142

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Solutions

Keywords: solute, solvent,saturated solution,unsaturated solution,supersaturated solution, unsaturated and concentration.

What is true of the rate of radioactive decay? A. The rate is constant. B. The rate is continuously accelerating. C. The rate is continuously decelerating. D. The rate is exponentially accelerating.

Answers

The truest of the rate of radioactive decay is that the rate is exponentially accelerating. The answer is letter D. The rate is constant, the rate is continuously accelerating, the rate is continuously decelerating do not answer the question above.

Answer:

its a) the rate of decay is constant.

29 Which term identifies a type of nuclear reaction?(1) fermentation (3) reduction
(2) deposition (4) fission

Answers

Answer:The correct answer is option (4).

Explanation:

Nuclear reaction :These the chemical reaction in which change in identity of a nucleus of an atom takes place.It is of two types:

  1. Fusion is a process which involves the conversion of two small nuclei to form a heavy nuclei along with release of energy.
  2. Fission is a process which involves the conversion of a heavier nuclei into two or more small and stable nuclei along with the release of energy.

From the given options the option identifying the nuclear reaction is fission.Hence. the correct answer is option 4.
4) fission is a nuclear reaction where the nucleus of a reactant breaks apart

Select the ion.

1)Cu
2)PO4-3
3)SO2

Answers

I believe the answer is B. PO4-3

Answer:

Explanation:  the answer is B. PO4-3

A similarity between the forces involved in both ionic and covalent bondingis that bothO A) involve the sharing of electrons.O B) involve the transfer of electrons.O C) involve the attraction of opposite charges.requre same amountof energy toereakther bonds

Answers

Stating the difference between covalent and ionic bonding....

ionic bonds consist of the transfer of electrons, and covalent consists of the sharing of electrons.

This being said..answer choices A and B are out of the picture.

Thus, answer choice C is your answer.

Involve the attraction of opposite charges;require same amount of energy to break their bonds.
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