CHEMISTRY HIGH SCHOOL

The pH of a solution is determined to be 11.6. It is acidic

basic

neutral

a salt

Answers

Answer 1
Answer: The solution is basic since it has a pH of 11.6. A pH 

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Which reaction should be used to convert propene into alkyl halide

Answers

Alkyl is a rare compound, and also very confusing.
I'm assuming you meant "propane"...

C3H8  = Propane
CnH2n+1-- X  << Alkyl Halide
X = Cl

Simply set a chemical reaction :


C3H8 → CnH2n+1-- X



An inherited behavior or physical characteristics that helps an organism survive and reproduce Natural selection Predation Adaptation Competitionlook at pic thanks :D​

Answers

Answer:

it's natural selection

Explanation:

adaptation is when you adapt to some situation

Which of these equations is balanced? A. H2O+Co ---> H2Co3 B. 2NaCl +H2SO4 ----> Na2SO4 + 2HCl C. 2CaO+ H2O ----> Ca(OH)2 D. Mn +Fe ----> MnS + Fe

Answers

Answer is: B. 2NaCl +H2SO4 ----> Na2SO4 + 2HCl.

According to principle of mass conservation, number of atoms must be equal on both side of balanced chemical reaction.

There are two sodium atoms, two chlorine atoms, two hydrogen atoms, one sulfur atom and four oxygen atoms on both side of balanced chemical reaction.

A) This reaction is not balanced, because number of oxygen atoms are not the same.

C) This reaction is not balanced, because number of oxygen and calcium atoms are not the same.

D) This reaction is not balanced, because number of sulfur atoms are not the same.

The equatin that is balanced is 2NaCl + H2SO4 → Na2SO4 + 2HCl. The answer is letter B. The reactant has two Na, 2 Cl, 2 H, 1 S and 4 O. These number of atoms is also the same for the product side.

Which substance does not obey the Lewis octet rule?(a) N₂
(b) NO
(c) CF₄
(d) Ar

Can anyone explain this?

Answers

I can tell you that the first five elements of the periodic table does not obey the octet rule. The only reason for that is because they are trying to be like their closest noble gas which will be helium in this case.

Which statement compares the masses of two subatomic particles?(1) The mass of an electron is greater than the mass of a proton.
(2) The mass of an electron is greater than the mass of a neutron.
(3) The mass of a proton is greater than the mass of an electron.
(4) The mass of a proton is greater than the mass of a neutron.

Answers

atoms are made of 3 types of subatomic particles - electrons, protons and neutrons

mass of proton is 1 atomic mass unit and proton is also 1 atomic mass unit

masses of protons and neutrons are very similar

mass of an electron is 1/1840th of 1 atomic mass unit

mass of electron is insignificant when compared to masses of neutrons and protons

protons and neutrons have a larger mass than electrons

from the given options correct answer is

(3) The mass of a proton is greater than the mass of an electron
Electrons have mass 0
Protons have mass 1
Neutrons have mass 1

(1) 0 is not greater than 1
(2) 0 is not greater than 1
(3) 1 is greater than 0
(4) 1 is not greater than 1

So the answer is (3) The mass of a proton is greater than the mass of an electron

The mass number of an isotope of uranium is 238, and its atomic number is 92. Which symbol best represents this isotope of uranium?

Answers

Answer: _(92)^(238)\textrm{U}

Explanation:

Isotopes are atoms of same element which have same atomic number but different mass number.

General representation of an element is given as:   _Z^A\textrm{X}

where,

Z represents Atomic number

A represents Mass number

X represents the symbol of an element

General representation of an isotope of ursium with atomic number of 92 and mass umber of 238 and represented by the symbol U is:

_(92)^(238)\textrm{U}
Uranium with an atomic mass number of 238 indicates that it is highly unstable and radioactive. This is because its original number of neutrons is only 92, giving it 146 more neutrons than the usual. These isotopes are usually given symbols denoted by the element-"atomic mass". This means a symbol for this isotope is Uranium-238 or ^238U.
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