CHEMISTRY HIGH SCHOOL

These two compounds are in the liquid phase at 293 K a. Br₂ and Hg
b. Cl2 and F2
c. NH4^{+} and H₃O^{+}
d. Fe and Co
e. Diamond and graphite

Answers

Answer 1
Answer: It should be br and hg

Related Questions

The study of metals and the process for refining and making things from them is called _____. philosophy18metallurgyinductive reasoning
How does ionization energy increase on the periodic table
How many hydrogen atoms are in the chemical formula C6H12O6
Why are alloys useful?​
What did other investigators find based off Stanley Miller's 1953 primordial soup experiment? A. That water turned into various types of gases found in the earth's early atmosphere. B. That amino acids, fats, and nucleic acids might have formed in the waters of the past. C. That nitrogen gases, hydrogen gas, methane, and ammonia were formed in the waters of the past. D. That water turned into amino acids and fat, but nucleic acids were caused by lightning.

Carbon forms molecular compounds with some elements from Group 16. Two of these compounds are carbon dioxide, CO2, and carbon disulfide, CS2.Carbon dioxide is a colorless, odorless gas at room temperature. At standard temperature and pressure, CO2(s) changes directly to CO2(g).

Carbon disulfide is formed by a direct reaction of carbon and sulfur. At room temperature, CS2 is a colorless liquid with an offensive odor. Carbon disulfide vapors are flammable.

59 Identify one physical property and one chemical property of CS2. [1]

Answers

Answer: Physical property of CS_2 is state of matter (liquid) and it is a chemical compound.

Explanation:

Chemical property is defined as the property of a substance which is observed during a reaction where the chemical composition identity of the substance gets changed.

Physical property is defined as the property which can be measured and whose value describes the state of physical system. For Example: State, density etc.

Carbon disulfide(CS_2) is the compound which is formed by the chemical combination of carbon and sulfur atoms. The equation for this follows:

C+2S\rightarrow CS_2

The chemical property of carbon disulfide is different from that of carbon and sulfur. Thus, this is a chemical compound.

It is given, that this compound is a colorless liquid, which means that the state of this compound is liquid state.

Hence, physical property of CS_2 is state of matter (liquid) and it is a chemical compound.

The physical property of carbon disulfide is that at room temperature, CS2 is a colorless liquid with an offensive odor. The chemical property of carbon disulfide is that it is formed by a direct reaction of carbon and sulfur.

Which of these statements is NOT TRUE? Scientists propose explanations that can be explained by examining evidence. Scientists propose explanations that can be explained by examining evidence. Science is an organized way to investigate, understand, and explain events in the natural world. Science is an organized way to investigate, understand, and explain events in the natural world. Scientists collect and organize information randomly, looking for patterns and connections between events. Scientists collect and organize information randomly, looking for patterns and connections between events. Science deals only with the natural world.

Answers

Answer:

The correct option is;

Scientist propose explanations that can be explained by examining evidence

Explanation:

A scientists makes an hypotheses based on possible natural processes to explain the origin and/or the nature of the characteristics of a natural observation. The scientist then source more data and information to put their hypotheses to test. Due to the fact that an hypotheses is based on observable  processes and/or mechanisms, the given hypotheses can be further tested by other scientists through the use of their individually sourced data. From the result of the assessment, the hypotheses can be either accepted or rejected to enable the better clarification of the hypotheses when accepted or the development of a new hypotheses when rejected.

Ice is _______ dense than water.more

less

equally as

twice as

Answers

Ice is less dense than water. The orientation of hydrogens are further apart from each other.

Answer:

Ice is Less Dense than water

Explanation:

If you put ice in water the ice won't sink to the bottom because water is denser then ice.

:)

Select all that apply. Marie and Pierre Curie's discoveries included: X-rays uranium radium pitchblende polonium

Answers

Marie and Pierre Curie's discoveries included: Polonium and Radium. Marie Curie's death involved her long-term exposure to radiation. I hope this answer helps you on your assignment.

Answer;

  • Radium
  • Polonium

Explanation;

  • Pierre and Marie are known for their work in the study of radioactivity that led to the discoveries of new radioactive elements radium and polonium.
  • Radium element was named after the Latin word ray and Polonium was named after Marie's home country, Poland.
  • Element radium was discovered in the form of radium chloride, that was extracted from uraninite.

Which two formulas represent Arrhenius acids?(1) CH3COOH and CH3CH2OH
(2) HC2H3O2 and H3PO4
(3) KHCO3 and KHSO4
(4) NaSCN and Na2S2O3

Answers

Answer : The correct option is, (2) HC_2H_3O_2\text{ and }H_3PO_4

Explanation :

Arrhenius theory : It sates that an acid is a type of substance that ionizes in the water to give the hydronium ion or hydrogen ion (H^+) and a bases is a type of substance that ionizes in the water to give hydroxide ion (OH^-).

Or we can say that,

Arrhenius acid are those which can easily gives the hydrogen ion in a solution and Arrhenius base are those which can easily gives the hydroxide ion in a solution.

In option 1,CH_3COOH can easily gives the hydrogen ion but CH_3CH_2OH can not gives the hydrogen ion due to stronger O-H bonding. So, these formulas does not represent Arrhenius acids.

In option 2,CH_3COOH and H_3PO_4 can easily gives the hydrogen ion. So, these formulas represent Arrhenius acids.

In option 3,KHCO_3 and KHSO_4can not gives the hydrogen ion because both are the salts. So, these formulas does not represent Arrhenius acids.

In option 4,NaSCN and Na_2S_2O_3can not gives the hydrogen ion because no hydrogen present in the compound. So, these formulas does not represent Arrhenius acids.

Hence, (2) HC_2H_3O_2\text{ and }H_3PO_4 represent Arrhenius acids.
The answer is (2) HC2H3O2 and H3PO4.

The nucleus of some isotopes will spontaneously undergo nuclear decay. These isotopes are said to be radioactive. What causes the nucleus of an isotope to be radioactive?a. too many electrons in its orbitals
b. exposure to toxic chemicals
c. the net charge of the atom
d. the attraction of protons to electrons
e. an unstable ratio of protons and neutrons

Answers

e. an unstable ratio of protons and neutrons

The answer is: e. an unstable ratio of protons and neutrons.

Neutrons stabilize the nucleus, because they attract protons and reduce electrical repulsion between protons.

The larger is neutron-proton ratio, the higher is probability for nuclear decay.

Ratio of protons to neutrons in a stable atom is 1 : 1.

For example, nitrogen atom (N-14) has 7 protons (p⁺) and 7 neutrons (n°). The neutron–proton ratio (N/Z ratio or nuclear ratio) is 7 : 7 ( 1 : 1 ).

Another example, neon atom (Ne-20) has 10 protons (p⁺) and 10 neutrons (n°). The neutron–proton ratio is 10 : 10 ( 1 : 1 ).  

The neutron–proton ratio generally increases with increasing atomic number.

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