CHEMISTRY HIGH SCHOOL

Of the elements Fe, Hg, U, Te, and Y, which is considered a Group A element?

Answers

Answer 1
Answer:

Answer:

Te is considered a Group A element.

Explanation:

Fe, Hg and Y belong to Group B.

U is a transition element.

Te is the only element that belong to Group A.

I hope I've solved your doubt.

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Which statement is true about ionic compounds?They are made up of many large molecules that are bonded together.They are made up of atoms of only one type of element.They are made up of particles that are arranged in a repeating pattern.They are made up of a random ratio of elements that are bonded together.

What units do scientists use to measure temperature and time?

Answers

Answer:

Scientists commonly use two equivalent units of temperature, the degree Celsius and the kelvin.

Explanation:

Which of the following is a nonmetal?a. iron
b. silver
c. oxygen
d. copper

Answers

Iron, Silver and Copper are all metal. Only Oxygen in this specific choices is not metal. Oxygen is known to be the 3rd most abundant element in the Universe but the 1st most abundant element on earth by mass. And we all know that Oxygen is a very essential part in our daily living in this world, actually not only humans who need Oxygen but also some creatures like animals. Oxygen is represented as O in the periodic table and its atomic number is 8. 

_____ is a halogen used in gaseous and liquid form for large scale disinfection of drinking water and sewage. A. Iodine B. Chlorine C. Bromine D. Fluorine E. Betadine

Answers

Answer:

Chlorine

Explanation:

Chlorine is a halogen that is a strong oxidizer (it takes electrons from nearby compounds).  In so doing, it kills bacteria, viruses, and other microorganisms.  The chlorine reacts with cell walls or other vital organic compounds (e.g., proteins)  to render them useless.  Chlorine is relatively inexpensive and generally easy to handle, but it is dangerous in gaseous form and highly alkaline in solution, so must be stored and handled properly.

A sample of aluminum metal absorbs 8.32 J of heat, upon which the temperature of the sample increases from 23.2 degrees C to 30.5 degrees C. Since the specific heat capacity of aluminum is 0.90 J/g-K, the mass of the sample is what in grams?

Answers

Given:

8.32 J of heat

from 23.2 degrees C to 30.5 degrees C

heat capacity of aluminum is 0.90 J/g-K

 

Required:

m in grams

 

Solution:

H = mCpT

(8.32 J) = m(0.90 J/g-K)(30.5 – 23.2)K

m = 1.27g

In which reaction are electrons transferred from one reactant to another reactant?(1) 2Ca(s) + O2(g) =>2CaO(s)
(2) AgNO3(aq) + KCl(aq) =>AgCl(s) + KNO3(aq)
(3) HCl(aq) + NaOH(aq) =>NaCl(aq) + H2O(l)
(4) H3O+(aq) + OH-(aq) => 2H=O(l)

Answers

Answer : The correct reaction is, (1) 2Ca(s)+O_2(g)\rightarrow 2CaO(s)

Explanation :

(1) 2Ca(s)+O_2(g)\rightarrow 2CaO(s)

In this reaction, the oxidation state of calcium (Ca) changes from (0) to (+2) and the oxidation state of oxygen (O) changes from (0) to (-2). In this reaction the electrons are transferred from one reactant (calcium) to another reactant (oxygen). This is a synthesis reaction.

(2) AgNO_3(aq)+KCl(aq)\rightarrow AgCl(s)+KNO_3(aq)

In this reaction, there is no changes in the oxidation state of the elements. So, in this reaction, no electrons transferred from one reactant to another reactant. This is a double-displacement reaction.

(3) HCl(aq)+NaOH(aq)\rightarrow NaCl(aq)+H_2O(l)

In this reaction, there is no changes in the oxidation state of the elements. So, in this reaction, no electrons transferred from one reactant to another reactant. This is a neutralization reaction.

(4) H_3O^+(aq)+OH^-(aq)\rightarrow 2H_2O(l)

In this reaction, there is no changes in the oxidation state of the elements. So, in this reaction, no electrons transferred from one reactant to another reactant. This is a combination reaction.

Hence, the correct reaction is, (1) 2Ca(s)+O_2(g)\rightarrow 2CaO(s) in which the electrons transferred from one reactant to another reactant.
The answer is (1). The electrons transfer form one reactant to another means that there is the change of valence. For other choices, the valence of reactant does not change.

Which of these is an appropriate instrument to measure mass? balance, burette, ruler, graduated cylinder

Answers

Answer: balance

Explanation:

Mass is a physical property of a body. It is the measure of resistance of acceleration that a body offers. It is also determined by the strength of gravitational attraction between two or more bodies. The SI unit of mass is the kilogram or gram.

A balance is a device which can be used to measure the accurate mass of the body. The electrical balance has a digital screen which gives the measurements in kilograms or grams in digits.

The answer is balance because you try to make the point hit square in the middle and you measure how much grams it has when you do hit the middle. Hope this helps.
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