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blagie [28]
3 years ago
9

HELP ME PLEASE!!!!!!!!!! DUE IN 5 MINUTES!!!!!!!!!!!!!

Chemistry
2 answers:
Readme [11.4K]3 years ago
8 0
I only know the last one, it is water would not exist.
Super sorry! :(
But I hope it helps!
Kruka [31]3 years ago
5 0
Q1 The paper clip has a lower mass

Q2 liquid water

Q3 Hydrogen to Ca2+

Q4 water wont expand

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How is a sand bar formed?
solniwko [45]

Answer:

Matter is classified into two broad categories, namely, pure substances and mixtures. Mixtures can be separated into pure substances by physical methods. Pure substances are further divided into categories as elements and compounds. ... A pure substance can be either an element or a compound.

Explanation:

8 0
3 years ago
Where do you think trees get the nutrients they need to grow?<br>I​
serg [7]
The answer is the sun and water
7 0
4 years ago
What is used to represent a bond in an ionic compound ?
Pie

Answer:

Electronegativity difference between 2 atoms

Explanation:

1. If the electronegativity difference (usually called ΔEN) is less than 0.5, then the bond is nonpolar covalent.

2. If the ΔEN is between 0.5 and 1.6, the bond is considered polar covalent

3. If the ΔEN is greater than 2.0, then the bond is ionic.

6 0
3 years ago
Calculate the solubility in g/l of lead (ii) fluoride in water at 25 oc if ksp of pbf2 is 4. 1 x 10-8.
Svetlanka [38]

The solubility of Lead(II)Fluoride is 2.17 × 10⁻³ g/L in water at 25°C.

At a specific solution temperature, a solid salt compound can entirely dissolve in pure water up to a predetermined molar solubility limit. The dissociation stoichiometry ensures that the molarities of the constituent ions are proportionate to one another. The saturable nature of the solution causes them to also coexist in a solubility equilibrium with the solid component. At this temperature, a solubility product constant Ksp is calculated using the solubility product of their molarity values.

Lead (II) fluoride has the following solubility equilibrium for its saturated solution:

                   PbF_2(s) ⇄ Pb^2^+ (aq) + 2F^- (aq)

                   K_s_p = [Pb^2^+][F^-]^2

This compound dissociates in a 1:2 ratio of ions. For the compound dissolved in pure water, the Ksp is expressed in terms of the molar solubility "x" as:

K_s_p = (x) (2x)^2\\

K_s_p = 4x^3

Here,

K_s_p= 4.1 × 10^-^8

4.1 × 10⁻⁸ = 4 x³

x³ = 1.025 × 10⁻⁸

x³ = 10.25 × 10⁻⁹

x = 2.17 × 10⁻³ g/L

Therefore, the solubility of Lead(II)Fluoride is 2.17 × 10⁻³ g/L.

Learn more about solubility here:

brainly.com/question/23946616

#SPJ4

6 0
2 years ago
What Is a decrease in velocity called
Andrews [41]
The decrease in velocity is called deceleration or negative acceleration.


Hope i helped... If you need anything else ask me! :)

5 0
3 years ago
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