Silicon dioxide, SiO2, is a(n) _____

Answers

Answer 1

Answer:

Answer : Silicon dioxide, $SiO_2$ , is a covalent compound.

Explanation :

Covalent compound : It is a compound in which the bonds are formed by the equal sharing of electrons. The bonds are formed between two non-metals.

Ionic compound : It is a compound in which the bonds are formed by the complete transfer of electrons.

In the silicon dioxide $(SiO_2)$ , the silicon and the oxygen atom is a non-metals and the bonds are formed between silicon and oxygen non-metal atoms are the covalent bonds.

Hence, the silicon dioxide, $SiO_2$ , is a covalent compound.

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Particles are arranged in a crystal structure in a sample of:a) H2 (g)b) Br2 (L)c) Ar (g)d) Ag (s)
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1. Gas Formula Helium He Methane CHA Oxygen 0₂ Nitrogen N₂ Chlorine Cl₂ Relative atomic or molecular mass 4 ,16, 32 ,28 ,71 Look at the table and answer the following questions. (a) Which two gases will mix fastest? (b) Which gas will take least time to escape from gas syringe? (c) Which gas will diffuse slowest and why? Or (c) An unknown gas diffuses faster than 0₂ and slower than N₂, what can you about its molecular mass?

Answers

Answer:

Explanation:

a) this is for the gases with lowest molecular mass meaning they are light and so move faster and so mix faster

b) The gas taking least time will be Cl2 as it is the heaviest gas and so moves the slowest

c) Same its Cl2 and same reason

d) This will be lighter than oxygen but heavier than nitrogen

a habitat must include all of the following except a. food sources. b. favorable conditions for reproduction. c. more than one population of a given species. d. adequate shelter and/or protection.

Answers

Answer: c. More than one population of a given species.

Explanation:

A habitat is a place or location which provide shelter and other necessary resources desired for survival.

Among the options given more than one population of a given species is correct option. This is because of the fact that if more than one population of species exists there will be competition for resources among the members this will lead to the decline in number of individuals in the populations.

A habitat must include all of the following except C. More than one population of a given species.

Hydrogen sulfide burns form sulfur dioxide:2H2S(g) +3O2(g) → 2SO2(g) + 2H2O(g) ΔH= -1036 kJ

Calculate the enthalpy change when burning 26.7 g of hydrogen sulfide in kJ

pls help

Answers

Answer: 404.04 kJ.

Explanation:

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

moles of $H_2S$

$\text{Number of moles}=(26.7g)/(34.1g/mol)=0.78moles$

$2H_2S(g)+3O_2(g)\rightarrow 2SO_2(g)+2H_2O(g)$ $\Delta H=-1036kJ$

According to stoichiometry :

2 moles of $H_2S$ on burning produces = 1036 kJ

Thus 0.78 moles of $H_2S$ on burning produces = $(1036kJ)/(2)* 0.78=404.04$

Thus the enthalpy change when burning 26.7 g of hydrogen sulfide is 404.04 kJ.

Which of the following bonds is the most polar in nature:(1) Cl2
(2) HCl
(3) HBr
(4) HI

Answers

The answer will be (4) HI because the greater the difference of the bonds in electronegativity, the more polar a bond is.

Final answer:

HCl is the most polar bond, as greater the difference in electronegativity, the more polar the bond. Here, Chlorine is more electronegative than Hydrogen, Bromine, and Iodine, making the HCl bond most polar.

Explanation:

The most polar bond in the list provided is HCl. Polarity in bonds is determined by the difference in electronegativity between the two atoms in the bond. The greater the electronegativity difference, the more polar the bond. Chlorine (Cl) is more electronegative than Hydrogen (H), Bromine (Br), and Iodine (I), and so the bond between Cl and H is the most polar. The other three options (Cl2, HBr, HI) are either bonds between atoms of the same element (and therefore nonpolar because the electrons are shared equally) or are less polar due to the lower electronegativity difference.

Learn more about Polarity of Bonds here:

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Please tell me the answer to the following question and if you can please explain it, if you will I'll vote your answer the brainliest and you'll receive more points. Thank you!Which of the following pairs of elements is least likely to form an ionic compound?
1.) Calcium and Bromine
2.) Sodium and Fluorine
3.) Lithium and Chlorine
4.) Magnesium and Argon

Answers

First you need to know how ionic compounds are created!

Ionic compounds are formed by IONS (Obviously, what am I, a dummy?)
There are two types of ions: anions and cations.
Anions can only be formed by nonmetals, and cations can only be formed by metals.
In order for ions to bond, there must be one anion and one cation, because opposite charges attract.

Let's look at your choices.

1) Ca + Br can form ionic bonds
2) Na + F can form ionic bonds
3) Li + Cl can form ionic bonds

However...

4) Mg + Ar

This is a special case. Ar is a NOBLE GAS, which means that it has the maximum number of valence electrons (8) in its outermost shell. Therefore, ANY type of bonding is IMPOSSIBLE.

Your answer should be 4) Mg + Ar

During a chemical reaction substances called reactants During a chemical reaction substance called reactants are combined to form a new substance called products which of the following are currently describes reactions and products of a chemical reaction

Answers

Answer:

During a chemical reaction, substance called reactants are combined to form a new substance called products.

this sentence describes reaction and products of a chemical reaction

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