Why alkali metals are found in many common substances but are rarely found in pure form?

Answers

Answer 1

Answer: Alkali metals are very reactive so in pure form they quickly react with oxygen, water and other elements and compounds to form new substances. That's why they're found in many substances but rarely in pure form.

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Why did the identity of the water not change when it formed ice? assroo.

Answers

It didn't change because nothing but the temperature to make it freeze went into it so it is still the same substance. Hope this helped!

Which expression represents a reaction rate?a. time/massc. energy/timeb. number/timed. time/energy

Answers

The right answer for the question that is being asked and shown above is that: "b. number/timed." Reaction Rate refers to the speed of reaction for a reactant or product in a particular reaction is intuitively defined as how fast or slow are action takes place.

A reaction rate is typically expressed as the change in the amount of reactants or products over a certain period of time. So the option b is correct.

The rate of a chemical reaction can be measured by monitoring the number of moles or molecules of a particular substance consumed or produced per unit of time. Hence, the expression "number/time" best represents a reaction rate. For example, if we observe the formation of 5 moles of product X in 2 minutes, the reaction rate of X would be 5 moles per 2 minutes (5 moles/2 minutes). This quantitative approach allows scientists to study reaction kinetics and understand the speed at which reactions proceed, enabling the optimization and control of various chemical processes. Hence option b is correct.

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The weight of a substance is defined as its mass divided by its volume. Please select the best answer from the choices provided T F

Answers

Answer: The given statement is false.

Explanation:

Weight :It is defined as the measure of force exerted upon the object by the gravity. It is measured in Newtons.

$W=mg$ , where W= Weight , m = mass of the object , g = acceleration due to gravity = $9.8m/s^2$

Here the given statement is False, the correct statement will be:

The density of a substance is defined as its mass divided by its volume.

I would say false :D

Which of the following is not an example of a mineral crystal shape? A. Calcite
B. Kryptonite
C. Quartz
D. Pyrite

Answers

B. Kryptonite. The reason for this is that it is a nonexistent compound, or if it exists it is manmade and only able to survive for a few second. The suffix -tie indicates that is a bonded with oxygen, which, since Krypton is a noble gas, is impossible. also, crystals are formed from ionic bonds, and since both krypton and oxygen are non-metals, a bond between them would be covalent.

One phosphorus, three chlorine, one oxygen

Answers

Phosphoryl chloride :

POCl3

hope this helps!.

Which substances can act as an arrhenius acid in aqueous solution(1) NaI
(2) HI
(3) LiH
(4) NH3

Answers

An Arrhenius acid is a proton donor, hence among the following, HI is an Arrhenius acid in aqueous solution.

What is an acid?

Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Compounds such as HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.

According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic acids depending on the number of protons which are liberated on dissociation.

Acids are widely used in industries for production of fertilizers, detergents batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.

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HI acts as an arrhenius acid in solution. It will dissociate into H⁺ and I⁻ therefore being a proton donor. (HI is actually one of the 7 strong acids)
I hope this helps.

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