What is the IUPAC name for the compound ZnO?(1) zinc oxide (2) zinc oxalate(3) zinc peroxide (4) zinc hydroxide

Answers

Answer 1
Answer: The correct answer is option 1. THe IUPAC name for the compound ZnO is zinc oxide. It is an inorganic compound that is a white powder, insoluble in water and widely used as an additive in many materials and products. Most common application is as a skin cream.

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Which quantity identifies an element?1. Atomic number 2. Mass Number3. total number of neutrons in an atom of the element 4. total number of valence electrons in an atom of the element

Chemicals secreted by glands which regulate tissues or organs are called______

Answers

Chemicals secreted by glands which regulate tissues or organs are called hormones. Endocrine glands are responsible for regulating body activities. Endocrine glands release chemicals that are called hormones which help the body to function properly. the endocrine system regulate many internal processes.

Answer:

Hormones

hope i helped!

What is the total number of protons contained in the nucleus of a carbon 14 atom

Answers

A carbon 14 atom would have two more neutrons than a carbon 12 atom but they would both still have 6 protons

The greatest composition by mass in an atom of 17/8 O is due to the total mass of itsA) electrons
B) neutrons
C) positrons
D) protons

Answers

Answer is B) - neutrons.


Both protons and neutrons contribute to the mass of an atom. But ₈¹⁷O atom has atomic number as 8. Hence, number of protons is 8. Atomic mass of the given atom is 17.


Atomic mass = number of protons + number of neutrons


Hence, number of neutrons in the given atom is 17 - 8 = 9.


So, the number of neutrons is greater than the number of protons. Hence the greatest composition of ₈¹⁷O atom is neutrons by mass.

A student blows up a ballon and then places it in a very cold freezer the ballon shrunk after hours why!?

Answers

Temperature is directly related to the speed of the molecules such that as the temperature decreases, so does the speed of the molecules. When the balloon was placed in the freezer, the temperature plummeted and so the molecules moved less. Due to this lack of movement, less space was used by the balloon so it shrunk.

In a calcium atom in the ground state, the electrons that possess the least amount of energy are located in the(1) first electron shell
(2) second electron shell
(3) third electron shell
(4) fourth electron shell

Answers

According to the electronic configuration, a calcium atom in the ground  state electrons which possess least amount of energy are located in first shell.

What is electronic configuration?

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elementshave valence shell complete in ground state and hence are said to be stable.

According to the electronic configuration,as the number of shells increases their energy also increases .Hence, electrons in first shell have least energy.

Learn more about electronic configuration,here:

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Answer:

1

Explanation:

first electron shell.

First electron shell possesses the least amount of energy at the core.

Hope this helps.

The tempertaure at which the pressure of the vapor of a liquid is equal to the external pressure acting on the surface of the liquid?

Answers

Answer: Boiling point

Explanation:

Boiling point is the temperature where the vapor pressure of a liquid equals the pressure of the gas present above it.

The normal boiling point of a liquid is the temperature at which its vapor pressure is equal to one atmosphere.

Boiling point depends on the intermolecular forces present between the molecules. More are the intermolecular forces, lesser will be the vapor pressure and thus more heat will be supplied to make vapor pressure equal to the atmospheric pressure. Thus higher will be the boiling point.

Normal boiling point for water is 100^0C.