Which element is a solid at STP?
A. H2
B. I2
C. N2
D. O2

Answers

Answer 1

Answer:

An element which is solid at STP that is standard temperature and pressure is iodine.

What is an element?

An element is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.Elements combine to form compounds.

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Answer 2

Answer: B. I2, di-Iodine, is solid at STP.

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0.0034ks= what in cs

Which 1-mole sample has the least entropy?(1) Br2(s) at 266 K (3) Br2(l) at 332 K
(2) Br2(l) at 266 K (4) Br2(g) at 332 K

Answers

The correct answer is option 1. Entropy is the degree of disorderliness in a system. Among the phases, solid has the most ordered structure. Also, at lower temperatures the molecules will have less kinetic energy therefore less motion. Thus, bromine in solid form at 266K has the least entropy.

A gas contained in a steel tank has a pressure of 1.5 atm at a temperature of 320 k. what will be the gas pressure when the temperature changes to 450 k? a gas contained in a steel tank has a pressure of 1.5 atm at a temperature of 320 k. what will be the gas pressure when the temperature changes to 450 k? 1.5 atm 0.47 atm 0.94 atm 2.1 atm 1.1 atm

Answers

Using Gay-Lussac's Law, we have
P2 = $((T2)X(P1))/(T1)$
where, P and T stands for pressure and temperature respectively, terms 1 and 2 indicates initial and final pressure/temperature respectively.

Given that, P1 = 1.5 atm, T1 = 320 K, T2 = 450 K,
∴P2 = $((450)X(1.5))/(320)$ = 2.1 atm

Final answer:

Using Gay-Lussac's Law, we calculate that when the temperature of a gas increases from 320 K to 450 K, the pressure of the gas will increase from 1.5 atm to 2.1 atm, assuming the volume and the amount of gas remain constant.

Explanation:

To answer the question, we need to use the concept in physics called Gay-Lussac's Law. This law states that the pressure of a given amount of gas held at a constant volume is directly proportional to the Kelvin temperature. It's also important to remember that when we're dealing with gases, temperatures have to be in Kelvin for our calculations to work.

Given that, we know that the initial pressure (P1) is 1.5 atm, the initial temperature (T1) is 320K, and the final temperature (T2) is 450K. We want to find the final pressure (P2). According to Gay-Lussac's law, this can be calculated using the following equation: P1/T1 = P2/T2.

Thus, P2 = P1 * T2 / T1 = 1.5 atm * 450K / 320K = 2.1 atm.

So, the gas pressure will be 2.1 atm when the temperature increases from 320 K to 450 K, assuming that the volume and the amount of gas remain constant.

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Which compound is a saturated hydrocarbon?

Answers

Saturated hydrocarbons are organic compounds that contain only single bonds between the carbon atoms. They are known to be the simplest organic compounds. They are termed as such because they are saturated with water. Examples are the alkanes (ethane, methane, propane, butane, etc.).

When an oxygen atom forms an ion, it gains two electrons. What is the electrical charge of the oxygen ion? A.
+2

B.
-1

C.
+1

D.
-2

Answers

D. 2- youre adding two negative charges to a neutral element

The electrical charge of the oxygen ion is -2.

What happens to population growth in a logistic growth pattern as it reaches carrying capacity?a. remains constant
b. speeds up
c. slows down

Answers

i believe the answer would be C. slows down, hope this helps:)

Which substance represents a compound?(1) C(s) (3) CO(g)(2) Co(s) (4) O2(g)

Answers

The substance that represents a compound among the given options is CO. The correct answer is (3) CO(g)

From the question,

We are to determine which of the given substances is a compound.

First, we will define a compound

A compound is a chemical species that is formed when two or more atoms join together chemically, with covalent or ionic bonds.

A compound is a substance that contains atoms of two or more different elements, and these atoms are chemically joined together

NOTE: A molecule consisting of atoms of only one element is NOT a compound.

Among the given options, only CO satisfies the definition of a compound, because it contains two different elements, Carbon (C) and Oxygen (O).

Hence, the substance that represents a compound among the given options is CO. The correct answer is (3) CO(g)

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C = Carbon
CO = Carbon Monoxide
Co = Cobalt
O2 = Oxygen

So the answer is (3) CO

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