CHEMISTRY HIGH SCHOOL

Based on its location on the periodic table, which metal is likely to be less reactive than rubidium and more reactive than calcium?potassium (K)

cesium (Cs)

magnesium (Mg)

titanium (Ti)

Answers

Answer 1
Answer:

Answer: Potassium is the element which is less reactive than rubidium and more reactive than Calcium.

Explanation: Reactivity of an metal is defined as the tendency to loose electrons easily. In a periodic table, the reactivity increases down the group as size of the metal increases. The reactivity decreases across a period as the size of the metal decreases.

Rubidium lies in group 1, which has elements in the series: H, Li, Na, K, Rb, Cs and Fr.

And Calcium lies in period 4 which has elements in the series: K, Ca, (1st transition series), Ga, Ge, As, Se, Br and Kr.

So, the element to have reactivity more than rubidium and less than Calcium must be Potassium (K).
Answer 2
Answer:

Answer:

A is the correct answer on edge

Explanation:

A)potassium (K)

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Need a correct answer fastHow many moles of solute are contained in a 500.0 milliliter solution that has a concentration of 0.35 M?

Which subatomic particles each have a negative electrical charge?A) protons
B) neutrons
C) electrons

Answers

Answer: Option (C) is the correct answer.

Explanation:

Each element contains three sub-atomic particles which are protons, neutrons and electrons.

Inside the nucleus of an atom, there will be only protons and neutrons. Whereas electrons revolve around the nucleus of an atom.

Protons have a positive charge, neutrons have no charge and electrons have a negative charge.

Thus, we can conclude that electrons are the subatomic particles and each of them have a negative electrical charge.
C) electrons have a -ve charge.

The density of an object is defined as mass per unit volume. Mathematically we write that: D = M/V. Rearrange this expression for: (a) M = ? (b) V = ?

Answers

The density of an object is defined as mass per unit volume. This can be rearranged to determine the mass or the volume of an object. For mass, the expression of density is rearranged to: M = VD. For the volume, the density is rearranged to: V = D/M.

HELP!!!! I HAVE 2 MINUTES!!!A substance placed into an open plastic container at room temperature exerts a force against the bottom of the container but not the sides of the container. What is the most likely phase of this substance?
A. gas
B. solid
C. liquid
D. plasma

Answers

Answer:

a solid

Explanation:

because because gas would excerpt forced throughout the whole container and plasma would be too hot for the plastic container and liquid would flow throughout the container touching the sides and solid is the only one that would probably only touch the bottom of the plastic container exerting force through there

Reactant X contains 199.3 J of chemical energy. Reactant Y contains 272.3 J of chemical energy. Product W contains 41.9 J of chemical energy. If the reaction loses 111.6 J of chemical energy as it proceeds, how much chemical energy must product Z contain? 318.1 J 429.7 J 541.3 J 625.1 J

Answers

Answer : The correct option is, 318.1 J

Solution :

The given chemical reaction will be,

X+Y\rightarrow W+Z+Energy

In this reaction, X and Y are the reactants and W and Z are the products.

As we know that the energy remains conserved during the chemical reaction.

So,

Sum of energy of product = Sum of energy of reactant

W+Z+Energy=X+Y\n\n41.9J+Z+111.6J=199.3J+272.3J\n\nZ=318.1J

Therefore, the amount of chemical energy of product Z contain will be, 318.1 J

Answer:

318.1 J

Explanation:

The reaction given is:

X + Y → W + Z

The chemical energy of the reaction (ΔU), is the variation of the chemical energy, so is the chemical energy of the products (UW and UZ) less the chemical energy of the reactants (UX and UY).

If the reaction loses the chemical energy, it must be negative, and the chemical energy that a substance contains, is positive.

ΔU = (UW + UZ) - (UX + UY)

-111.6 = (41.9 + UZ) - (199.3 +272.3)

-111.6 = 41.9 + UZ - 471.6

- UZ = - 429.27 + 111.6

-UZ = - 318.1

UZ = 318.1 J

According to the arrhenius theory an acid is a substance that

Answers

The Arrhenius theory established that acids and some bases: dissociate giving rise to ions.

What is the Arrhenius theory?

Arrhenius's theory was a theory of acids and bases formulated on the basis of his theory of ionization of substances in aqueous solutions.

Principles of the Arrhenius theory

  • Acid substances are those that dissociate into hydrogen ions in aqueous solution.

  • Basic substances are those that dissociate into hydroxyl ions in aqueous solution.

Therefore, we can conclude that the Arrhenius theory explains that the characteristic properties of aqueous solutions of acids are due to hydrogen ions.

Learn more about the Arrhenius theory here: brainly.com/question/3920636

Answer:

According to the theory, an Arrhenius acid is a substance that gives hydrogen ion, H^(+) (or protons) as the only positively charged ions, when dissociated in water.

Explanation:

What this means is that acids increase the concentration of protons in water to form hydronium ions,as opposed to the idea that there aren't free hydrogen cations floating around in aqueous solution.

The Arrhenius definitions of acidity and alkalinity are restricted to aqueous solutions and refer to the concentration of dissolved ions.

What percent by mass of each chloroform molecule is composed of chlorine?

Answers

So chloroform is CHCl3 so the first thing we need to do is find out what the mass in amu of one atom of chloroform:
12.01amu(C)+1.008amu(H)+3*35.45amu(Cl3)=119.368amu
Then we find the amu of the Cl in the molecule which is 3*35.45amu=106.35amu
Then to find the percent by mass we take the mass of the 3 Cl divide it by the total mass of the molecule and multiply by 100.
so 106.35/119.368=0.89094 and 0.89094*100=89.094%
so the percent by mass of each chloroform molecule that is composed of chlorine is 89.094%!
I hope this helps!
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