CHEMISTRY HIGH SCHOOL

Rainforests are typically responsible for global oxygen turnover

Answers

Answer 1
Answer: false...........................................
Answer 2
Answer:

Answer:

false

Explanation:

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Concentrated nitric acid used in laboratory is 68 % nitric acid by mass in aqueous solution. What should be the molarity of such a sample of the acid if the density of the solution is 1.504 g mL-1?

Answers

68% by mass = 68 / 100 => 0.68

Density = 1.504 g/mL⁻¹

Molar mass HNO₃ =63.01 g/mol

M = 1000 * T* D / mm

M = 1000 * 0.68 * 1.504 / 63.01

M = 1022.72 / 63.01

M = 16.23 mol/L

hope this helps!

An atom of oxygen is in an excited state. When an electron in this atom moves from the third shell to the second shell, energy is(1) emitted by the nucleus
(2) emitted by the electron
(3) absorbed by the nucleus
(4) absorbed by the electron

Answers

An atom of oxygen is in an excited state. When an electron in this atom moves from the third shell to the second shell, energy is emitted by the electron. Hence, option B is correct.

What is an atom?

 The smallest piece of stuff that still retains its characteristics is an atom. A gold atom, for instance, is the smallest piece of that element that will still retain all of gold's properties and behaviors. When an atom is disassembled into its component parts, the subatomic particles found inside each have special characteristics that are not at all similar to those of the element the atom represents. Protons, neutrons, and electrons are the three different subatomic particle kinds.

The electron that transitioned from a higher to a lower level felt the change in energy level. Since the nucleus is unaffected, its energy levels are unaffected as well. Since it requires more energy to keep an electron at a higher energy level than a lower one, the shift in energy levels indicates that the electron released some energy.

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The change in energy level was experienced by the electron that moved from a higher to a lower level. This does not affect the nucleus, so the nucleus itself does not change energy levels. It takes more energy to hold an electron at a higher than a lower energy level, so the change in energy levels means that some energy was released by the electron, and this is choice (2).

What unit is used to express the pressure of a gas?(1) mole (2) joule (3) kelvin (4) pascal

Answers


The answer is a PASCAL!

An atom of the element zinc has an atomic number of 30 and a mass number of 65. How many protons does an uncharged zinc atom have?30
35
65
95

Answers

Answer : The correct option is, 30 protons

Explanation :

Element = Zinc

Atomic number = 30

Atomic mass number = 65

As we know that the atomic number is equal to the number of electrons and number of protons.

Atomic number = Number of electrons = Number of protons = 30

Number of neutrons = Atomic mass - Number of protons = 65 - 30 = 35

Therefore, the number of protons an uncharged zinc atom have 30 protons.

Answer:

30 protons

Explanation:

i took the test

The chemical formula below shows how salt is produced.HCl + NaOH -----> NaCl + H2O

Which substances are the reactants?

Answers

Answer:

reactants: HCl and NaOH

Explanation:

A chemical reaction or equation can be explained with reference of two components: the reactants and products

Reactants are atoms, molecules or ions that are present of the left side of the equation. These could either be a single entity  which can break or decompose under a given conditions or they could combine with other entities appropriately to form new molecules, atoms, ions etc. These new molecules occupy the right side of the reaction and are termed as Products.

The given reaction is and acid-base neutralization reaction

HCl + NaOH -----> NaCl + H2O  

Reactants:

HCl, hydrochloric acid

NaOH, sodium hydroxide

Products:

NaCl, sodium chloride

H2O, water
hydrochloric acis and sodium hydroxide

How does thermal energy affect the three states of matter??

Answers

An increase in thermal energy, changes the state of matter from solid to liquid to gas.
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