CHEMISTRY HIGH SCHOOL

Henri Becquerel discovered radium and polonium.Please select the best answer from the choices provided
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F

Answers

Answer 1

Answer: That would be false, Marie Curie discovered radium and polonium.

Answer 2

Answer:

Answer:

That would be false

Explanation:

No need to explain

Related Questions

A student tested a 0.1 M aqueous solution and made the following observations:• conducts electricity • turns blue litmus to red • reacts with Zn(s) to produce gas bubbles Which compound could be the solute in this solution? (1) CH3OH (3) HBr (2) LiBr (4) LiOH
Which liquid has the highest vapor pressure at 75°C?(1) ethanoic acid (3) propanone(2) ethanol (4) water
The valence electrons occur in what part of the atom?a. the nucleus b. in each electron shell c. the outer electron shell d. the innermost electron shell
The sequence in which energy sublevels are filled is specified by
What volume do 4.96 moles of O2 occupy at STP?

Nitrogen gas consists of _____. two separate nitrogen atoms a diatomic nitrogen atom a molecule of two nitrogen atoms a compound of nitrogen atoms

Answers

Nitrogen gas consists of a molecule of 2 nitrogen atoms.

Final answer:

Nitrogen gas consists of a molecule of two nitrogen atoms, known as a nitrogen-nitrogen triple bond, making it stable and unreactive. Diatomic nitrogen atoms or compounds of nitrogen atoms are not correct representations of nitrogen gas due to the bonding and structure of nitrogen gas.

Explanation:

Nitrogen gas consists of a molecule of two nitrogen atoms. In this molecule, the two nitrogen atoms are bound together in what is known as anitrogen-nitrogen triple bond, which is very strong. This is why nitrogen gas is very stable and unreactive under normal conditions.

Therefore, a diatomic nitrogen atom or a compound of nitrogen atoms is not a correct representation of nitrogen gas because these expressions do not accurately reflect the bonding and molecular structure of nitrogen gas.

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A solution of h2so4(aq) with a molal concentration of 6.80 has a density of 1.318 g/ml. what is the molar concentration of this solution?

Answers

The molalconcentration of the solution is 5.38 M.

The molal concentration of sulphuric acid = 6.80 m

The density of the solution = 1.318 g/ml

Mass of the sulphuric acid in the solution is,

$= 6.80 * 9.80$

$=666.4 \: g$

The mass of sulphuric acid present in the solution is 666.4 g.

Let the mass of the solvent in which sulphuric acid is dissolved be 1000 grams.

So the total mass of the solution is,

= Mass of solvent + Mass of sulphuric acid

$= 666.4 \: + \: 1000$

$= 1666.4 \: g$

The total volume of the solution is,

$= (1666.4 * 1)/(1.318 * 1000)$

$= 1.264 \: L$

The volume of the solution is 1.264 liters.

The molal concentration of this solution is,

$= (6.80)/(1.264)$

$= 5.38 \: M$

Therefore, the molal concentration of the solution is 5.38 M.

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A 5.0-gram sample of zinc and a 50.-milliliter sample of hydrochloric acid are used in a chemical reaction. Which combination of these samples has the fastest reaction rate?(1) a zinc strip and 1.0 M HCl(aq)
(2) a zinc strip and 3.0 M HCl(aq)
(3) zinc powder and 1.0 M HCl(aq)
(4) zinc powder and 3.0 M HCl(aq)

Answers

Answer:

(4) zinc powder and 3.0 M HCl(aq)

Explanation:

First consider the equation of reaction:

$Zn + 2HCl --> ZnCl_2 + H_2$

1 mole of Zinc requires 2 moles of HCl for reaction.

mole of zinc = mass/molar mass = 5.0/65.38 = 0.0765 mole

0.0765 mole of zinc will require: 0.0765 x 2 = 0.1530 mole HCl

Mole of 1.0 M HCl = Molarity x volume = 1 x 0.05 = 0.05 mole

Mole of 3.0 M HCl = 3 x 0.05 = 0.15

Hence, the 3.0 M HCl is what will give the required number of mole.

Zinc in powder form will react faster compared to in strip because the former has higher surface area for reaction.

Therefore, zinc powder and 3.0 M HCl will give the fastest reaction rate.

The correct option is option 4.

The answer is Zine powder and 3.0 M HCl (aq)

Why is nonpoint source pollution potentially more harmful than point source pollution?a.Nonpoint source pollution disrupts the water cycle.
b.Nonpoint source pollution is difficult to regulate.
c.Nonpoint source pollution comes from more than one source.
d.Nonpoint source pollution is more damaging to living organisms than point source pollution

Answers

A, nonpoint souce pollution is "a main problem with water quality."

Edgeuity says the correct answer is B

The bonds in BaO are best described as(1) covalent, because valence electrons are shared
(2) covalent, because valence electrons are transferred
(3) ionic, because valence electrons are shared
(4) ionic, because valence electrons are transferred

Answers

The answer is (4) ionic, because valence electrons are transferred. Ba is a metal and O is a nonmetal, so the bond between them is ionic. Ionic bonds occur when electrons are transferred from the metal to the nonmetal, and the cation-anion pair is held together by electrostatic attraction.

What is the molarity of 0.50 g of Na dissolved in a 1.5 L solution?

Answers

Answer : The molarity of solution is, 0.0145 mole/L

Solution : Given,

Mass of solute, Na= 0.50 g

Volume of solution = 1.5 L

Molar mass of Na= 23 g/mole

Molarity : It is defined as the number of moles of solute present in the one liter of solution.

Formula used :

$Molarity=(w_b)/(M_b* V)$

where,

$w_b$ = mass of solute, Na

V = volume of solution in liters

$M_b$ = molar mass of solute, Na

Now put all the given values in the above formula, we get the molarity of a solution.

$Molarity=(0.50g)/(23g/mole* 1.5L)=0.0145mole/L$

Therefore, the molarity of solution is, 0.0145 mole/L

Molar mass Na = 23.0 g/mol

1 mole Na ------- 23.0 g
? mole Na ------ 0.50 g

moles = 0.50 * 1 / 23.0

moles = 0.50 / 23.0

= 0.0217 moles of Na

Molarity = number of moles / liters solution

M = 0.0217 / 1.5

= 0.014467 M

hope this helps!

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Aspirin can be made in the laboratory by reacting acetic anhydride (C4H6O3) with salicylic acid (C7H6O3) to form aspirin (C9H8O4) and acetic acid (C2H4O2). The balanced equation isC4H6O3+C7H6O3→C9H8O4+C2H4O2In a laboratory synthesis, a student begins with 2.90 mL of acetic anhydride (density=1.08gml−1) and 1.23 g of salicylic acid. Once the reaction is complete, the student collects 1.24 g of aspirin.1. Determine the theoretical yield of aspirin for the reaction. Express your answer using three significant figures.2. Determine the percent yield of aspirin for the reaction. Express your answer using three significant figures.