Write a general statement that describes the periodic trend in the solubility of alkaline earth metal compounds.

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In the late 1800s, the British scientist J. J. Thomson discovered that atoms were composed of positively-charged and negatively-charged particles. He proposed that these two types of particles were evenly mixed throughout the structure of the atom. How does this atomic model differ from current atomic models?A. Current atomic models show that atoms do not have positively-charged particles.

B. Current atomic models show an atom's positively-charged particles concentrated in the center of the atom.

C. Current atomic models show that atoms do not have negatively-charged particles.

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Option B.

Current atomic models show the positive charged particles (protons) concentrated in the center (nucleus) of the atom, along with the neutrons, and the negative charged particles (electrons) distributed around (far from) the nucleus.

How many Atoms are in 2.3 g of Na? show your work and these question will take two steps

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Use stoichiometry and convert 2.3 grams of sodium to moles. Then convert the moles to atoms using 6.02(10)^23.

Post your answer and I'll post mine :)

In the chemical equation Zn + 2HCl ZnCl2 + H2, the reactants are A. zinc and hydrochloric acid.
B. zinc and hydrogen carbonate.
C. zinc chloride and hydrogen.
D. zinc chlorate and water.

Answers

In the chemical reaction: Zn + 2HCl -> ZnCl₂ + H₂, the reactants are zinc, Zn and hydrochloric acid, HCl (Option A)

How to determine the reactants in the reaction?

Chemical equations are representation of chemical reactions with symbols and formula of elements involved in the reaction.

Every chemical equation has two sides. These are:

Reactants: They are located on the left hand side of the equation
Products: They are located on the right hand side of the equation

With the above information, we can determine the reactants of the chemical equation. This is shown below:

Chemical reaction: Zn + 2HCl -> ZnCl₂ + H₂
Reactant =?

Reactants => They are located on the left hand side of the equation

=> Zn and HCl

Thus, the correct answer to the question is: zinc and hydrochloric acid (option A)

Learn more about reactants in reaction:

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The answer is A ( and the answer for the products is C )

Which statement describes a chemical propertyof sodium?
(1) Sodium has a melting point of 371 K.
(2) Sodium has a molar mass of 23 grams.
(3) Sodium can conduct electricity in the liquid
phase.
(4) Sodium can combine with chlorine to produce
a salt.

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Answer;

(4) Sodium can combine with chlorine to producea salt.

Explanation;

Sodium is an alkali metal (group 1 ) in the periodic table. It is a soft metal, reactive and with a low melting point. It has an atomic weight of 23 grams.

Sodium is a good conductor of electricity due to the presence of delocalized electrons in its metallic structure. It reacts vigorously with water to produce sodium hydroxide and hydrogen.

-When exposed to air, metallic sodium recently cut looses its silvery appearance and acquires an opaque grey color due to the formation of a sodium oxide coating.

(4) Sodium can combine with chlorine to produce a salt is the correct answer. The other three are just physical properties~

What is the pH of an aqueous 0.032 M pyridine, (C5H5N)? (Kb for pyridine = 1.7 x 10–9)

Answers

pH + H₂O ⇋ [pOH]⁺ + OH⁻

Kb = [pOH⁺][OH⁻] / [ pH] = 1.7×10⁻⁹

Let x mol dissociate:

[pOH⁺] = [OH⁻] = x [pH] = 0.032 - x ≈ 0.032

[x] [x] / [0.032] = 1.7×10⁻⁹

x₂ = 0.032 * 1.7 x 10⁻⁹

x = 5.44 x 10⁻¹¹ = [OH⁻]

pOH = -log [OH⁻] = -log[ 5.44 x 10⁻¹¹] = 10.26

pH = 14.00 - pOH

pH = 14.00 - 10.26

PH = 3.74

hope this helps!

What is the best safety practice recommended before leaving the chemistry laboratory?

Answers

Answer:

Washing your hands properly.

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