CHEMISTRY HIGH SCHOOL

A logical, systematic approach to the solution of a scientific problem1. Scientific Method
2. Scientific Law
3. Chemistry
4. Experiment

Answers

Answer 1
Answer: The answer is (1) Scientific Method. The Scientific Method is the method in which scientists do an experiment. It's a logical series of steps that ensures scientists don't miss anything and keep things organized.

Related Questions

why have some elements been known longer than others? why was it easier to find these elements such as gold, silver, and copper?
Exactly how much time must elapse before 16 grams of potassium-42decays, leaving 2 grams of the original isotope?(1) 8 × 12.4 hours (3) 3 × 12.4 hours(2) 2 × 12.4 hours (4) 4 × 12.4 hours
What are the 7 diatomic elements?
What is another term used for a "base"
How does the reaction affect oxygen atoms?

Boron occurs naturally as two isotopes. What is the difference between these isotopes?

Answers

Answer: The two isotopes of boron differs in mass number rather than atomic number.

Explanation:

Isotopes are defined as the chemical species that have same atomic number but differ in their mass number.

Boron is the 5th element of the periodic table and have 2 naturally occurring isotopes. The isotopes are : B-10 and B-11

For _5^(10)\textrm{B} isotope:

Percentage abundance of this isotope = 20 %

Atomic number = 5

Mass number = 10

For _5^(11)\textrm{B} isotope:

Percentage abundance of this isotope = 80 %

Atomic number = 5

Mass number = 11

Hence, the two isotopes of boron differs in mass number rather than atomic number.
"They have different numbers of neutrons and different mass numbers.  Remember mass number is protons plus neutrons. The number of protons for an element will never change, however the number of neutrons can." I took the test, its D

50 POINTS Which of the following is a synthesis reaction?

2H2O yields 2H2 + O2

H2 + Cl2 yields 2HCl

2Li + CaO yields Li2O + Ca

CH4 + 2O2 yields CO2 + 2H2O

Answers

You will notice that the first answer decomposes into two seperate products with 1 reactant, so since this is only true of decomposition reactions, that is not the answer.

H2+Cl2 yields 2HCl could be the answer, as it starts with 2 reactants and ends with one product, something found in synthesis reactions. 

The third answer is incorrect because even though there are no decompositions of single products, the metal exchanges positions, something that only occurs in decomposition reactions.

In the fourth answer is also incorrect because the methane is oxidized. This only happens in decomposition reactions.

The correct answer, then, is B.

The abbreviation that represents a volume unit isa. cm3.
b. mg.
c. mm.
d. cm.

Answers

The answer is A - cm3

Which substance does not obey the Lewis octet rule?(a) N₂
(b) NO
(c) CF₄
(d) Ar

Can anyone explain this?

Answers

I can tell you that the first five elements of the periodic table does not obey the octet rule. The only reason for that is because they are trying to be like their closest noble gas which will be helium in this case.

Show a numerical setup for calculating the percent by mass of NaCl in the solution inbeaker 4.

Answers

Let's think about the solution first: it's composed of water (100 g) and 35.04 grams of NaCl  (in beaker for)

together it's 100+35.04=135.04

and NaCl in this solution is 35.04/135.04=25.95.

So the answer is 25.95
Mass Percentage Definition. Mass percentage is one way of representing the concentration of an element in a compound or a component in a mixture. Mass percentage is calculated as the mass of a component divided by the total mass of the mixture, multiplied by 100%.
% mass = [( 35.04) / ( 100 + 35.04)] * 100
% mass = 25.95 %

A scientist wants to perform a controlled experiment to test the effect of rust on chemically treated iron. which action would be most important to perform in a controlled experiment? design an experiment that is based on previously published results. expose the treated iron to the corrosive effects of the air. test a large piece of treated iron and a small piece of untreated iron. test a piece of treated iron and a piece of untreated iron under the same conditions.

Answers

Answer: Option (d) is the correct answer.

Explanation:

A test or experiment in which only one variable is changed at a time in order to verify the result is known as a controlled experiment.

That is only independent variable need to be adjusted with respect to the dependent variable.

Thus, we can conclude that the action to test a piece of treated iron and a piece of untreated iron under the same conditions would be most important to perform in a controlled experiment in the given situation.
the answer is to test a piece of untreated and treated under same conditions!
Other Questions
How many grams of Cl are in 535 g of CaCl2?
Given the balanced equation representing a phase change:C6H4Cl2(s) + energy==>C6H4Cl2(g)Which statement describes this change?(1) It is endothermic, and entropy decreases.(2) It is endothermic, and entropy increases.(3) It is exothermic, and entropy decreases.(4) It is exothermic, and entropy increases.
Which of the following best describes solids?A. Solids are low in density and compressible. B. Solids are high in density and compressible. C. Solids are low in density and incompressible. D. Solids are high in density and incompressible.
Which metal has no reaction with dilute hydrochloric acid or hydrochloric acid and forms a black oxide