CHEMISTRY HIGH SCHOOL

The pH scale for acids and bases ranges from _____.A.) 1-7
B.) 0-14
C.) 1-14
D.) 1-12

Answers

Answer 1
Answer: The pH scale for acids and bases ranges from 1 - 14. The answer is letter C. The rest of the choices do not answered the question above. There are quite a few relationships between [H+] and [OH−] ions. And because there is a large range of number between 10 to 10-15 M, the pH is used. pH = -log[H+] and pOH = -log[OH−]. In aqueous solutions, [H+ ][OH- ] = 10-14. From here we can derive the values of each concentration.

 

 -log[H+ ] + -log[OH- ] = -log[10-14]

pH + pOH = 14

So pH = 14 – pOH and pOH = 14 – pH 
Answer 2
Answer:

the correct answer is  B.) 0-14

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Which two properties are used to define matter? A.has mass and conducts heat
B.has buoyancy and volume
C.has mass and takes up space
D.conducts energy and has characteristic properties

Answers

The two properties which are used to define matter are that it has massand it takes up space. The other properties do not necessarily apply toeach matter. Such some matter can be a conductor of heat (such as metal)and some not (such as non metals). Likewise, some matter can be buoyantand float on liquid of density more than it but others would not on theliquids of density less than it. In-fact not all the matters areconductors of energy (such as heat, sound, electricity) or at-least avery poor conductor of energy and tend to find application asinsulating agents (non conductors). So the only thing which isnecessarily true is that the matter would definitely have mass in eventheir minutest form as atom and would take up some space.

What is the theoretical yield of H2O if 130 g of H2O is produced from 18 g of H2 and an excess of O2?

Answers

The theoretical yield of H2O if 130g of H2O is produced from 18g of H2 and an excess of O2 is 160g. 

Answer: The theoretical yield of water is 162 grams.

Explanation:

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}      .....(1)

Given mass of hydrogen gas = 18 g

Molar mass of hydrogen gas = 2 g/mol

Putting values in equation 1, we get:

\text{Moles of hydrogen gas}=(18g)/(2g/mol)=9mol

The chemical equation for the formation of water from hydrogen gas and oxygen gas follows:

2H_2+O_2\rightarrow 2H_2O

As, oxygen gas is present in excess. It is considered as an excess reagent.

So, hydrogen gas is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

2 moles of hydrogen gas produces 2 moles of water

So, 9 moles of hydrogen gas will produce = (2)/(2)* 9=9mol of water

Now, calculating the mass of water from equation 1, we get:

Molar mass of water = 18 g/mol

Moles of water = 9 moles

Putting values in equation 1, we get:

9mol=\frac{\text{Mass of water}}{18g/mol}\n\n\text{Mass of water}=162g

Hence, the theoretical yield of water is 162 grams.

2. A sample of iron has the dimensions of 2.0 cm x 3.0 cm x2.0 cm. It has a mass of 94.0 grams. What is the density of
iron? (8 points)

Answers

Answer:

first change cm to m and g to kg so you will find the volume first which is 0.02 by 0.03 by 0.02 your answer is 0.000012 m . using the formula density=mass/volume take 0.094/ 0.00012 then divide

Life has existed on Earth for about 3.8 billion years despite gradual and sudden environmental changes. How do the scientific factors of sustainability help explain how life has continued to survive and evolve?

Answers

Answer:

As we all are aware that life on Earth is existed due to several environmental changes and there are several scientific factors of sustainability that support the survival and evolution of life on Earth.

Scientific factors of sustainability include solar energy, chemical cycle, and biodiversity that supported life on Earth.solar energy helps all organism and especially producers to gain energy and store the energy which further used in chemical cycles of transferring energy to other trophic levels.

Chemical cycle also involves the interaction of biotic and abiotic envrionment with each other that leads to environmental changes as well as organisms adapt themselves accordingly.

Biodiversity maintains the balance in the ecosystem and prevent dominancy of one organism otherwise it can lead to scarcity and organism would not be able to survive. Variation in biodiversity due to random mating  in the same species leads to evolution and produces new species of organisms.  

Hence, scientific factors of sustainability play major role in survival and evolution of life on the Earth.

The muscles in the stomach aid in digestion by __________.a. secreting bile
b. churning, or mixing, food
c. opening and closing the stomach
d. absorbing nutrients

Answers

The muscles in the stomach aid in digestion by churning, or mixing, food. Hence, option C is the correct answer.

What is digestion?

Digestion is the complex process of turning the food you eat into nutrients, which the body uses for energy, growth and cell repair needed to survive.

The stomach is a muscular sac that lies between theesophagus and the small intestine in the upper abdomen.

The stomach is not the only part of your digestive system that absorbs food but rather is a part of the digestive system and important for churning food into a consistency that is easier to digest for the rest of your intestines.

Hence, option C is the correct answer.

Learn more about digestion here:

brainly.com/question/2272856

#SPJ2

Churning or mixing food.

The stomach is a muscular sac that lies between theesophagus and thesmall intestine in the upper abdomen. The stomach is not the only part of your digestive system that absorbs food but rather is a part of the digestive system and important for churning food into a consistency that is easier to digest for the rest of your intestines.

What is a chemical solution and what are the names of its components?

Answers

Answer:

A chemical solution is defined as a homogeneous mixture of two or more substances. There are two components of chemical solution that include solute and solvent.

Solute is the component that get dissolved in another substance and solvent is the substance that dissolve solute.

For example:  carbon dioxide in water. Where carbon-dioxide is solute and water is solvent.
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