CHEMISTRY HIGH SCHOOL

How many liquids are found on the periodic table?

1

Answers

Answer 1

Answer:

There are six liquids found on the periodic table.

1. Bromine

2. Mercury

3. Caesium

4. Gallium

5. Rubidium

6. Francium

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Which balanced equation represents an endothermic reaction?1.)C+O2-> CO22.)CH4+2O2-> CO2+2H2O3.)N2+3H2-> 2NH34.)N2+O2-> 2NO
0.0034ks= what in cs
A .35 m solution of weak acid, HX, has a h+ of 4.15×10^-3. what is the value of ka for this acid
A 1.0 m h2s solution has a ph = 3.75 at equilibrium. what is the value of ka?

What starts chemical changes in food?

Answers

Hi!
Enzymes in your saliva start to break down the sugars in your food and start the chemical process in which your food's nutrients are released

The molar heat of vaporization of water is 40.7kJ/mol. How much heat must be absorbed to convert 50.0 grams of liquid water at 100oC to steam at 100oC?A) 1.46 X 10 kJ
B) 1.13 X 102kJ
C) 2.04 X 103kJ
D) 3.66 X 104kJ

Answers

During a phase change the temperature does not change since all of the heat is being absorbed in order to break the intermolecular forces. Due to that, the formula will not need to have T in it and is actually q=nΔH(v).
n=the number of moles (in this case 2.778mol of water since you divide 50g by 18g/mol).
ΔH(v)=the molar heat of vaporization (in this case 40.7kJ/mol).
q=the heat that must be absorbed
q=2.778mol×40.7kJ/mol
q=113.1kJ
Therefore the water needs to absorb 1.13×10²kJ.

I hope this helps. Let me know if anything is unclear.

Which substance can not be broken down by a chemical reaction?(1) ammonia (3) methane
(2) argon (4) water

Answers

The substance that cannot be broken down by a chemical reaction is argon. This is because the substance is an element, otherwise if this is a compound, then it can be still broken down by chemical means. Ammonia, methane and water are all compounds.

The substance that cannot be broken down by chemical reaction is $\boxed{\left( 2 \right){\text{ argon}}}$ .

Further Explanation:

Substance is the pure form of matter while combination of atoms or molecules is termed as a mixture.

Types of substances:

1. Element

The simplest form of substance that cannot be further broken down by any chemical method is known as an element. Carbon, sulfur, and cobalt are some of the examples of elements.

2. Compound

When two or more different elements are held together by chemical bonds, compounds are formed. These can further be broken down into their respective constituents. Their properties are quite different from those of their constituent elements. NaCl, ${\text{C}}{{\text{H}}_{\text{4}}}$ and ${{\text{H}}_{\text{2}}}{\text{O}}$ are examples of compounds.

(1) Ammonia consists of one nitrogen and three hydrogen atoms so it is a compound. Therefore it can be broken down by chemical reactions.

(2) Argon is an element so it is the simplest form in which it can exist. Therefore it cannot be broken down by chemical reactions.

(3) Methane consists of one carbon and four hydrogen atoms so it a compound. Therefore it can be broken down by chemical reactions.

(4) Water consists of one oxygen and two hydrogen atoms so it is a compound. Therefore it can be broken down by chemical reactions.

Learn more:

Which sample is a pure substance? brainly.com/question/2227438
Which is a characteristic of a mixture? brainly.com/question/1917079

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Elements, compounds, and mixtures

Keywords: substance, methane, argon, ammonia, water, element, compound, chemical reactions, broken down, simplest form, NaCl, CH4, carbon, sulfur, cobalt.

What is the correct molar mass for the compound CaBr3

Answers

CaBr₃ = 40 + 80 * 3 = 280 g/mol

hope this helps!

In 3 to 5 sentences identify the type of bonding the would form between potassium and chlorine use a electronegativitynegativity to justify the bond type provide a chemical formula for resulting compound

Answers

Answer: Potassium and chlorine would form an ionic bond due to their large difference in electronegativity values (3.0 for chlorine and 0.8 for potassium). In ionic bonding, one atom completely transfers electrons to another atom to form ions with opposite charges that are attracted to each other. Since potassium loses one electron to become a positive ion (K+) and chlorine gains one electron to become a negative ion (Cl-), the resulting compound will be KCl (potassium chloride).

Which of the following statements explains the difference between a lease and a loan?a. At the end of a loan the car belongs to you, but at the end of a lease, the car still belongs to the
lease company
b. At the end of a loan, the car still belongs to the lease company, but at the end of a lease the car
belongs to you.
c. A loan requires a large down payment at the beginning while a lease does not.
d. A lease requires a large down payment at the beginning while a loan does not.
Please select the best answer from the choices provided