CHEMISTRY MIDDLE SCHOOL

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride.

Answers

Answer 1

Answer:

Answer:

True

Explanation:

Ammonium sulfate reacts with barium chloride to produce barium sulfate and ammonium chloride.

Hardness, lustre, and colour.

Explanation:

These Rocks shown in photographs are made of different types of minerals which have properties as follows:

●The color of the rock is grey, brown and yellow after it is ground into a powder its color is streak.

● The lustre of the rock tells how shiny the rocks are.

● Other properties include hardness, texture, shape, and size.

Complete the paragraph to describe the characteristics of a silicon tetrahydride molecule (SiH4). The Lewis structure and table of electronegativities are given.

Answers

Answer: The correct answer is polar, tetrahedral and non-polar.

Explanation:

It is given a compound which is silicon tetrahydride having formula $SiH_4$

The electronegativities of silicon and hydrogen are 1.9 and 2.1 respectively.

Difference in electronegativity = 2.1 - 1.9 = 0.2

From above, some difference in the electronegativities of the atoms is there. This means that bond polarity of this molecule is polar. If the difference would have been 0, the bond polarity of the molecule is taken as non-polar.

To determine the molecular shape of the given molecule, we calculate the hybridization of this molecule. The equation used for this is:

$\text{Number of electrons}=(1)/(2)[V+N-C+A]$

where,

V = number of valence electrons present in central atom i.e. Silicon = 4

N = number of monovalent atoms bonded to central atom = 4

C = charge of cation = 0

A = charge of anion = 0

Putting values in above equation, we get:

$\text{Number of electron pairs} =(1)/(2)[4+4-0+0]=4$

As, the total number of electron pairs is 4, this means that the hybridization of this molecule will be $sp^3$ and the molecular shape will be tetrahedral.

The net dipole moment of the molecule is 0 because of the symmetry of the molecule. Thus, the molecule is considered as a non-polar molecule.

Hence, the correct answer is polar, tetrahedral and non-polar.

Least to greatest 2.62,2 2/5, 26.8%, 2.26%,271%

Answers

2.26%, 26.8%, 2 2/5, 2.62, 271%

Hope this helps! :D

2.62
2.50
26.8% - .268
2.26% - .0226
271% - 2.71
Converting a Percent to a Decimal is by dividing by 100.

so your answer would be
2.26%, 26.8%, 2.50, 2.62, 271%

Things that attract people to a new place are called

Answers

Answer:

tourist attraction

Explanation:

Tourist attraction.

Example: Things like the Statue of Liberty or the Eiffel Tower are tourist attractions that make people want to visit that new place .

hope this helps !

The volume of a gas at 99.0 kPa is 300.0 mL. If the pressure is increased to 188kPa, what will be the new volume?