CHEMISTRY HIGH SCHOOL

2PES
What is the correctly rounded answer of thee following calculation:
23.7 / 4.9 =?
0 4.8
04
5
0 4.84
O 4.83

Answers

Answer 1
Answer: 5 hope this helps I’m pretty sure it should be right

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Free radicals are molecules which: A)Damage cell membranes, DNA, and LDL. B)Steal electrons from molecules of surrounding tissues. C)All answers are correct. D)Are highly unstable. E)Are missing an electron.
Leutium-176 has a half-life of 3.85 mc012-1.jpg 1010 years. After 1.155 mc012-2.jpg 1011 years, how much leutium-176 will remain from an original 16.8-g sample?2.10 g 3.00 g 5.56 g 8.40 g
An electric current is conducted by what?

Which of the following is a TRUE statement?a.
A molecule always has three types of elements present

b.
Compounds always include the elements hydrogen and sodium

c.
Compounds include things we use in our everyday lives

d.
All elements prefer to hang out with other elements and form molecules

Answers

The true statement among the following options is c. As the substances which we use are compounds.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.

Compounds include things we use in our everyday lives.Compounds are substances composed of two or more different elements chemically combined in a fixed ratio by weight. They are everywhere in our daily life, from food to electronics. For example, table salt is a compound that we use to enhance the flavor of our food.

Thus, the correct option is C.

Learn more about compounds,here:

brainly.com/question/14117795

#SPJ3
It is going to be B is B is it

All chemical reactions use reactants in a specific proportion or stoichiometry to form products. The __________ reactant regulates the amount of products produced. A) excess B) limiting C) proportional D) stoichiometric

Answers

The correct answer is B) Limiting.


Hope this helped!

Answer:

B: Limiting

Explanation:

The limiting reactant regulates the amount of products produced, because you have the least amount of the limiting reactant.

Show the calculation of the molar mass (molecular weight) of a solute if a solution of 5.8 grams of the solute in 100 grams of water has a freezing point of 1.20oC. Kf for water is 1.86

Answers

Answer : The molar mass of solute is, 89.9 g/mol

Explanation : Given,

Mass of solute = 5.8 g

Mass of solvent (water) = 100 g

Formula used :  

\Delta T_f=K_f* m\n\nT_f^o-T_f=T_f*\frac{\text{Mass of solute}* 1000}{\text{Molar mass of solute}* \text{Mass of water}}

where,

\Delta T_f = change in freezing point

T_f^o = temperature of pure solvent (water) = 0^oC

T_f = temperature of solution = 1.20^oC

K_f = freezing point constant of water = 1.86^oC/m

m = molality

Now put all the given values in this formula, we get

(0^oC)-(1.20^oC)=1.86^oC/m* \frac{5.8g* 1000}{\text{Molar mass of solute}* 100g}

\text{Molar mass of solute}=89.9g/mol

Therefore, the molar mass of solute is, 89.9 g/mol

What role does the salt bridge play in voltaic cell

Answers

Answer:

It allows migration of ions from one half–cell to the other.

Explanation:
it provides the electric current, i.e. the positive and negative charges across the cell

Antacids work to relieve stomach acids because of which of the following types of reactions? A) decomposition
B) double-displacement
C) synthesis
D) single-displacement

Answers

Answer: The correct answer is Option B.

Explanation:

Decomposition is a type of chemical reaction in which larger compound breaks down into two or more smaller compounds.

AB\rightarrow A+B

Double displacement reactions is defined as the chemical reaction in which exchange of ions takes place.

AB+CD\rightarrow AD+CB

Synthesis reaction is a type of reaction in which two or more smaller compounds combines to form a single large compound.

A+B\rightarrow AB

Single displacement reaction is a type of reaction in which a more reactive metal displaces a less reactive metal from its chemical reaction.

A+BC\rightarrow AC+B

In stomach, an acid is present known as hydrochloric acid and to neutralize its effect, antacid is taken which has CaCO_ as a component.

The reaction between HCl and CaCO_3is a type of neutralization reaction and it is a type of double displacement reaction.

The equation between the two follows:

CaCO_3+HCl\rightarrow CaCl_2+H_2O+CO_2

Hence, the correct answer is Option B.

Carbon-14 is an isotope of carbon. How does it differ from other forms of carbon?

Answers

Carbon-14, also known as radiocarbon, is a radioactive isotope of carbon as compared to other forms of carbon. it contains 6 protons and 8 neutrons. The presence of such in organic materials is the basis of the radiocarbon dating method to date geological samples.
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