CHEMISTRY HIGH SCHOOL

Where are the heavy metals located on the periodic table

Answers

Answer 1
Answer:

Heavy metals are located on the lower part of the periodic table, specifically in the d-block and f-block elements.

In the periodic table, heavy metalsare found in the d-block and f-block, at the bottom. Elements in the d-block, or transition metals, span groups 3 through 12 in the periodic table. Metals like iron, copper, and zinc are included in this category.

The f-block elements, which comprise the lanthanides and actinides, may be found at the very end of the periodic table and are referred to as the inner transition metals. Due to their large atomic weights and high densities, elements like uranium and plutonium are classified as heavy metals.

Learn more about heavy metals, here:

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Answer 2
Answer:  they are located on the right side of the table heavy metals include lead, mercury, cadmium, sometimes chromium

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Which of the following statements is true for an exothermic reaction? The products have higher potential energy than the reactants, and the enthalpy change is negative.
The products have higher potential energy than the reactants, and the enthalpy change is positive.
The products have lower potential energy than the reactants, and the enthalpy change is negative.
The products have lower potential energy than the reactants, and the enthalpy change is positive.

Answers

Ans: The products have lower potential energy than the reactants, and the enthalpy change is negative.

In general, chemical reactions can be broadly classified into two categories:

1) Exothermic

2) Endothermic

Exothermic reactionsproceed with the evolution of heat. Here, the reactants have a higher potential energy which is released as the reaction progresses to form products. Consequently, the products are in a lower energy state. Since energy is released, the enthalpy change will be negative.

In contrast, endothermic reactions proceed with the absorption of heat. Here,the products will be in a higher energy state. Since energy is absorbed, the enthalpy change will be positive.
The enthalpy change for an exothermic reaction is negative because heat is being released, so that takes out two of the responses. Since energy is being released into the surroundings due to the exothermic reaction, the potential energy of the products is lower than that of the reactants. Energy is being put in to make the reaction occur, but then that energy is all being released into the surroundings thus a lower potential energy level for the products

The standard on which the atomic mass unit is based is the mass of a (1 point)proton. neutron. chlorine-35 atom. carbon-12 atom.

Answers

D. carbon-12 atom I hope this helps :)

Carbon-12 Atom is correct :)

What is the main intermolecular force in H2CO?(dipole dipole, hydrogen bond, London dispersion,polar/nonpolar)

Answers

Dipole-dipole interactions, and London dispersion interactions

A sample of CO2(s) and a sample of CO2(g) differ in their1) chemical compositions
2) empirical formulas
3) molecular structures
4) physical properties

Answers

The correct answer is D.
CO2(s) is a solid.
CO2(g) means it is gas.

So they differ in their physical properties.
Physical propertiers means that they differ in their look.

What is the percent by mass of potassium in K3Fe(CN)6?16.96%
21.88%
25.53%
35.62%

Answers

The percent mass of potassium in K3Fe(CN)6 is 35.62%. The molar mass (Mr) of K3Fe(CN)6 is the sum of atomic masses (Ar) of its elements. Ar(K) = 39.1 g/mol, Ar(Fe) = 55.84 g/mol; Ar(C) = 12.01 g/mol; Ar(N) = 14.01 g/mol. Mr(K3Fe(CN)6) = 3Ar(K) + Ar(Fe) + 6Ar(C) + 6Ar(N) = 3 * 39.1 + 55.85 + 6 * 12.01 + 6 * 14.01 = 117.3 + 55.85 + 72.06 + 84.06 = 329.27 g/mol. There are 3 atoms of K, so total mass of K in K3Fe(CN)6 is: 3Ar(K) = 3 * 39.1 = 117.3 g/mol. In percents, this is: 329.27 : 100% = 117.3 : x. x = 100% * 117.3 : 329.27 = 35.62%

Answer:

%35.62

Explanation:

Just took the test

A skillet is lined with a thin layer of cooking oil followed by a layer of unpopped popcorn kernels. Upon heating the kernels all pop thereby escaping the skillet. Which of the following physical and/or chemical changes occurred?

Answers

Physical change.

Explanation:

  • This is a physical change.
  • The reason for escaping pops is the water caught internal parts it's bit.
  • Inside the event that the bit is warmed to a tall satisfactory temperature, this water will modify into steam. Due to the troublesome and for the preeminent parcel nonporous shell, the steam has no put to go, coming nearly in a buildup of weight internal parts the bit.
  • Once the weight gets tall satisfactory and the temperature comes to around 180 degrees Celsius (355 degrees Fahrenheit), the pops escape from the skillet or bursts and the popcorn is turned internal parts out.
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