CHEMISTRY HIGH SCHOOL

What is the combustibility of calcium?

Answers

Answer 1

Answer:

the combustibility of calcium is relitivly high

Answer 2

Answer:

It's relatively high

Related Questions

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How are HNO3(aq) and CH3COOH(aq) similar?(1) They are Arrhenius acids and they turn blue litmus red.(2) They are Arrhenius acids and they turn red litmus blue.(3) They are Arrhenius bases and they turn blue litmus red.(4) They are Arrhenius bases and they turn red litmus blue.
A transformer has a primary voltage of 115 V and a secondary voltage of 24 V. If the number of turns in the primary is 345, how many turns are in the secondary? A. 1,653 B. 690 C. 72 D. 8

What year did tin got discovers and by whom tin is a element please help

Answers

Tin was found in 3000 BC, and nobody knows who discovered it!

How many milliliters of 0.02 M HCl are needed to react completely with 100 mL of 0.01 M NaOH?A) 200 mL
B) 100 mL
C) 75 mL
D) 50 mL
E) 25 mL

Answers

Answer: Option (D) is the correct answer.

Explanation:

Molarity is number of moles divided by volume of the solution.

Mathematically, Molarity = $(no. of moles)/(Volume)$

Also, in the given situation number of moles of both HCl and NaOH are equal. Therefore, volume of HCl will be calculated as follows.

$M_(HCl)V_(HCl)$ = $M_(NaOH)V_(NaOH)$

$0.02 M * V_(HCl)$ = $0.01 M * 100 mL$

$V_(HCl)$ = $(0.01 M * 100mL)/(0.02)$

= 50 mL

Thus, we can conclude that volume of HCl is 50 mL.

The reaction of HCl and NaOH is HCl + NaOH = NaCl + H2O. So the mole number of HCl and NaOH is equal. So the volume of HCl =0.01*0.1/0.02=0.05 L =50 ml. So the answer is D).

In plants, movement of CO2 and O2 happens through:

Answers

Stomata
Stomata are the pores present on the leaves of the plant

Are hydrogen bonds formed between all molecules?1.) No because hydrogen can only form these bonds with oxygen atoms.
2.) No because hydrogen can only form these bonds with highly electronegative atoms.
3.) Yes because hydrogen can easily form bonds with atoms that have a neutral charge.
4.) Yes because hydrogen can form these bonds with weakly electronegative atoms.

Answers

The correct statement for the given problem is $\boxed{{\text{2)}}\;{\text{No because hydrogen can only form these bonds with highly electronegative atoms}}}$

Further Explanation:

Intermolecular forces:

The forces that exist between the molecules are known as intermolecular forces (IMF). IMF includes both attractive as well as repulsive forces. They are electrostatic in nature and determine the bulk properties of the substances like melting and boiling points. Molecules are held in any substance due to these forces.

The various types of intermolecular forces are as follows:

1. Hydrogen bonding:

It is an attractive force that exists between hydrogen and more electronegative elements like N, O, F. It can either be intermolecular or intramolecular. Intermolecular hydrogen bonding is the one that occurs between different molecules. For example, the bond between HF and ${{\text{H}}_{\text{2}}}{\text{O}}$ is an intermolecular hydrogen bond. Intramolecular hydrogen bonding occurs between various parts of the same molecule. Ortho-nitro phenol and salicylaldehyde show this type of bonding.

2. Ion-dipole forces:

It is an attractive force that occurs between an ion and a molecule consisting of a dipole. The force between ${\text{N}}{{\text{a}}^ + }$ and water molecule is an example of this force.

3. Ion-induced dipole forces:

It is an attractive force that occurs between an ion and a nonpolar molecule. It induces a dipole in the molecule, resulting in ion-induced dipole force. The bond between ${\text{F}}{{\text{e}}^(2 + )}$ and oxygen molecule is an example of such kind of bond.

4. Dispersion forces:

Also known as London dispersion forces, van der Waals forces, instantaneous dipole-induced dipole forces. These forces exist between atoms and molecules. The forces that occur in ${{\text{F}}_2}$ molecule is a dispersion force.

(1) Hydrogen bond is the one formed between the highly electronegative atom and hydrogen. Although oxygen is a highly electronegative element, it also forms hydrogen bonds with hydrogen. But it there are also more electronegative elements, other than O that can form hydrogen bonds with hydrogen. So this statement (1) is incorrect.

(2) As is clear from the definition of hydrogen bonds, it is formed between highly electronegative elements (like F, O, and N) and hydrogen. So this statement (2) is correct.

(3) Hydrogen bonding is formed as the result of interaction between and an element that can induce a dipole in hydrogen. But neutral atom cannot induce any charge on hydrogen atom. So this statement (3) is incorrect.

(4) Hydrogen can form bonds with high electronegative elements and not with the weak electronegative elements. So the given statement (4) is incorrect.

Learn more:

1. Identification of ionic bonding: brainly.com/question/1603987

2. What type of bond exists between phosphorus and chlorine? brainly.com/question/81715

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Ionic and covalent compounds

Keywords: bond, oxygen, F, N, O, hydrogen bond, hydrogen, highly electronegative element, intermolecular forces, ion-dipole, ion-induced dipole, dispersion forces, attractive, repulsive, correct, incorrect, weakly electronegative.

No, hydrogen can only form these bonds with highly electronegative atoms. Therefore, the correct option is option 2.

When an electronegative atom is attracted to another electronegative atom nearby, a hydrogen atom that is covalently bound to a highly electronegative atom forms a hydrogen bond. This attraction results from variations in electronegativity values, which unbalances the distribution of electrons. While the electronegative atom acquires a partial negative charge, the electron-deficient hydrogen becomes weakly positively charged. The electromagnetic attraction between these partially positive and partially negative ions is known as a hydrogen bond, and it is quite powerful.

Therefore, the correct option is option 2.

To know more about hydrogen bond, here:

brainly.com/question/15857248

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Which of the following is the best example of heat being. Transferred by conduction

Answers

A metal spoon being placed in a boiling pot

How do you calculate the number of moles when given the number of particles?

Answers

Answer:

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CaSO3 (s) → → → → CaO (s) + SO2 (g) What mass of CaSO3 must have been present initially to produce 14.5 L of SO2 gas at a temperature of 12.5°C and a pressure of 1.10 atm?