CHEMISTRY HIGH SCHOOL

Lithium hydroxide is classified as an A. Arrhenius base B. Arrhenius acid C. Alcohol D. Aldehyde

Answers

Answer 1
Answer: Lithium hydroxide is classified as an annhenius base since it dissociates into lithium cations and hydroxide an ions and Arrhenius bases are defined as a substance that dissociated into hydroxide anions (as well as cations) when in solution. I hope this helps. Let me know if anything is unclear.

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A 1.0-gram piece of zinc reacts with 5 milliliters of HCl(aq). Which of these conditions of concentration and temperature would produce thegreatest rate of reaction?(1) 1.0 M HCl(aq) at 20.°C(2) 1.0 M HCl(aq) at at 40.°C(3) 2.0 M HCl(aq) at at 20.°C(4) 2.0 M HCl(aq) at at 40.°C
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Substances with a higher temperaturea. have less thermal energy. b. have more molecular disorder. c. become more orderly if heated more. d. will move thermal energy to a hotter substance.

Charlie is balancing an equation. She has identified the atoms and counted the number of each in the reactants and products. What would Charlie adjust to make the number of atoms in the reactants the same as the number of atoms in the products?

Answers

Answer: Stochiometric coefficients

Explanation: The chemical equations must be balanced to follow the law of conservation of mass which says that the mass of products must be same as the mass of reactants.

CH_4+O_2\rightarrow CO_2+H_2O

This is a skeletal equation  and needs to be balanced by adjusting the stochiometric coefficients. In order to keep the mass same, the number of atoms must be same on both sides.  

CH_4+2O_2\rightarrow CO_2+2H_2O

Answer:

The stoichiometric coefficients.

Explanation:

Hello,

Chemical reactions are widely generalized by the following chemical equation:

aA+bB-->cC+dD

Capitalized letters are referred to both the reacting and produced species during the chemical reaction meanwhile the lowered case letters are referred to the stoichiometric coefficients which balance the chemical reaction. Balancing means that the number of atoms in the reagents must be equal to the number of atoms in the products, this is exemplified via the following balanced chemical reaction:

2HCl+Ca(OH)_2-->CaCl_2+2H_2O

The coefficient 2 in the hydrochloric acid is set due to the produced calcium chloride which has two chlorine atoms in order to equal them.

Best regards.

The electron configuration 1sÆ 2sÆ2pÒ 3sÆ3pÒ represents which noble gas?

Answers

This noble gas is argon (Ar), because its third energy level is full.

how much oxygen would be produced by heating 20 g of mercury (II) oxide if 18.6 g of mercury is produced?

Answers

According to the stoichiometry of the reaction of mercury(II) oxide 1.477 g of  oxygen would be produced by heating 20 g of mercury (II) oxide if 18.6 g of mercury is produced.

What is stoichiometry?

Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

433.18 g mercury (II) oxide gives 32 g oxygen thus, 20 g  of mercury (II) oxide will produce 20×32/433.18= 1.477 g of oxygen.

Thus, 1.477 g of  oxygen would be produced by heating 20 g of mercury (II) oxide if 18.6 g of mercury is produced.

Learn more about stoichiometry,here:

brainly.com/question/30215297

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Hg2O -> O2 + Hg
2Hg2O -> O2 + 2Hg
20g-> ?g + 18.6g
                     (1 molHg2O )       (1 mol O2)           (32g O2)
 20g 2Hg2O x -------------------   x -------------------  x  -------------- = 0.77g O2
                    (834.36Hg2O)    (1 mol Hg2O)       (1 mol O2)

During the 1960s and 1970s, Cesar Chavezworked to unionize migrant farm workers by
(1) seizing the land of the lettuce and grape
growers
(2) securing passage of federal legislation to limit
immigration
(3) using nonviolent tactics such as boycotts and
hunger strikes
(4) urging growers to reduce the workforce
through mechanization

Answers

Answer:

The correct answer is option (3) "using nonviolent tactics such as boycotts and hunger strikes".

Explanation:

Cesar Chavez was a leader of American labor and civil right activists that fought to unionized migrant farm workers by the creation of The National Farm Workers Association. Cesar Chaves used nonviolent tactics to support the migrant farm workers. For instance, when Filipino American farm workers protested for higher wages in 1965, he encouraged Americans to boycott table grapes to support them; while he once performed a 24-day hunger strike in 1972 in the Santa Rita Center as a response to Arizona prohibiting boycotts and strikes by farm workers.

What is the molar mass of a substance

Answers

Molar mass of a molecule is the sum of the atomic mass of the individual elements in the molecule.  

Atomic mass of Pb = 207  amu

Atomic mass of N = 14  amu

Atomic mass of O = 16  amu

Here amu stands for atomic mass unit

Molar mass of Pb(NO₃)₂ = 207 + [14 + (16 x 3)] x 2  

                                         = 207 + 28 + (48) x 2 = 331 g/mol  
The mass of an element in the periodic table

Why do lighthouses use lenses?

Answers

To see far away? I'm thinking that like human glasses, lighthouses need lenses to see the far away boats. Or humans.
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