CHEMISTRY HIGH SCHOOL

Which statement is true about shape?A. All substances have
a set shape
B. Liquids take the shape of their container
C. You cannot change the shape of a substance
D. Shape is a characteristic property

Answers

Answer 1
Answer: B: Liquid take the shape of their container.

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Acid precipitation can be traced back to the burning of fossil fuels. a. True b. False
Which element has the greatest density at stp? calcium, chlorine, carbon or copper?
3 During a flame test, a lithium salt produces a characteristic red flame. This red color is produced when electrons in excited lithium atoms(1) are lost by the atoms (2) are gained by the atoms (3) return to lower energy states within the atoms (4) move to higher energy states within the atoms
What is the 10% energy rule?

Given the balanced equation:2C + 3H2==> C2H6
What is the total number of moles of C that must completely react to produce 2.0 moles of C2H6?
(1) 1.0 mol (3) 3.0 mol
(2) 2.0 mol (4) 4.0 mol

Answers

Answer: The correct answer is option 4.

Explanation:

2C+3H_2\rightarrow C_2H_6

According to the reaction, 1 mol of C_2H_6 is obtained from 2 moles of C gives

Then, 2 moles of C_2H_6 will be obtained from:

(2)/(1)* 2 moles of C =4 moles

Hence, the correct answer is option 4.
The answer is (4) 4.0 mol. This is a stoichiometry problem. You start with 2.0 mol of C2H6 and obtain the moles of C by multiplying 2.0 by the mole ratio, in this case 2. 2.0*2=4.0mol.

Which pair of formulas represents two compounds that are electrolytes?(1) HCl and CH3OH(2) HCl and NaOH(3) C5H12 and CH3OH(4) C5H12 and NaOH

Answers

Answer: Option (2) is the correct answer.

Explanation:

Electrolytes are the species that contain electric charges and are present as ions in a solution.

We can also say that ionic substances act as an electrolyte in a solution because ionic compounds have the ability to dissociate into ions.

For example, HCl \rightarrow H^(+) + Cl^(-)

and NaOH \rightarrow Na^(+) + OH^(-) dissociate completly into ions when dissolved in wateror polar solvent.

Thus, we can conclude that out of the given options, HCl and NaOH is the pair of formulas represents two compounds that are electrolytes.
HCI and NaOH is the formula that represents two compunds that are electrolytes.

In the process of electrolysis, current can flow through a liquid because A. water molecules become negatively charged. B. hydrogen is electrically neutralized in the solution. C. negative ions are attracted to the anode. D. cations of the electrolyte accumulate at the positive electrodes.

Answers

B. Hydrogen is electrically neutralized in the solution. Hydrogen is a chemical element with symbol H and atomic number 1. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table.

The correct answer is


C. Negative ions are attracted to the anode.

Calculate the molar solubility of calcium hydroxide in a solution buffered at each of the following pH's. pH 5, pH 7, pH 10

Answers

Calcium hydroxide dissolves and dissociates according to:
Ca(OH)₂(s) ⇄ Ca²⁺(aq) + 2 OH⁻(aq)  therefore the answer is PH7

0.25 mole of O2 will contain the same number of molecules as 0.25 mole of NH3.true or false ??

Answers

True, because most molecules have the same chemical or germ. Like 2.5 of an OxN = the same amount .

f chlorine gas is bubbled through an aqueous solution of sodium iodide, the result is elemental iodine and aqueous sodium chloride solution. What kind of reaction took place?

Answers

If chlorine gas is bubbled through an aqueous solution of sodium iodide, the result is elemental iodine and aqueous sodium chloride solution. The kind ofreaction that took place is decomposition reaction. Because sodium iodide is broken down into sodium and iodide atoms.
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Steel is made mostly of iron and carbon, though sometimes it can containa. tin. b. nickel. c. brass. d. cadmium.
When electroplating silver (Ag) on iron (Fe) what is oxidized
At normal temperature and pressure, air has a density of 0.001184 g/mL. What is the mass of air in a room that is 3.07 m by 3.00 m by 3.77 m? Answer in units of kg.