CHEMISTRY HIGH SCHOOL

Help please more points1 Change 9.0 x 10^7 from scientific to standard notation

2 Change 3.2 x 10^-5 from scientific to standard notation

3 Which types of measurements are appropriate for scientific notation? *

The speed of light

The speed of a snail

The speed of your car

4 Write 0.0000000000372 grams in scientific notation. Then convert to SI base units.

5 Write 45,000,000,000 kilometers in scientific notation. Then convert your answer to SI base units

6 A bulb thermometer gives an indoor temperature reading of 21 degrees Celsius. A digital thermometer in the same room gives a reading of 20.7 degrees Celsius. Which devise is more precise? Explain.

Answers

Answer 1

Answer:

Answer:

The answers are below

Explanation:

1.- Change 9.0 x 10^7 from scientific to standard notation

Just move the decimal point 7 places to the right

90000000

2 Change 3.2 x 10^-5 from scientific to standard notation

Just move the decimal point 5 places to the left

0.000032

3 Which types of measurements are appropriate for scientific notation? *

The speed of light is appropriate

The speed of a snail isn't appropriate

The speed of your car isn't appropriate

4 Write 0.0000000000372 grams in scientific notation. Then convert to SI base units.

Just move the decimal point 11 places to the right

3.72 x 10 ⁻¹¹ grams = 3.72 x 10 ⁻¹⁴ kg

5 Write 45,000,000,000 kilometers in scientific notation. Then convert your answer to SI base units

Just move the decimal point 10 places to the left

4.5 x 10 ¹⁰ km = 4.5 x 10¹³ m

6 A bulb thermometer gives an indoor temperature reading of 21 degrees Celsius. A digital thermometer in the same room gives a reading of 20.7 degrees Celsius. Which devise is more precise? Explain.

I think the digital thermometer is more precise because it can measure decimals, then the reading is closer to the right temperature. The other thermometer can't read decimals.

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What is the formula mass for fe(no3)3

Answers

Calculando a massa molar (molar peso) Para Calcular a massa molar de hum Composto químico, ponha SUA fórmula E clique em 'Calcular'. Na Fórmula química that rápido Você PODE USAR: QUALQUÉR elemento químico Grupos Funcionais: D, Ph, Me, Et, Bu, AcAc, Para, Ts, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg PARENTESIS () UO colchetes [] . Nomes Comuns de Compostos. Os Exemplos de Cálculos de Massa molar: NaCl , o Ca (OH) 2 , K4 [Fe (CN) 6] , CuSO4 * 5H2O , água , ácido nítrico , permanganato de potássio , etanol , frutose . Peso Computação molecular (massa molecular) para calcular o peso molecular de um composto químico entrar em sua fórmula, especifique seu número de massa isotópica depois de cada elemento entre colchetes. Os Exemplos de Cálculos de peso molecular: C [14] o [16] 2 , S [34] O [16] 2 . Definição de massa molecular, o peso molecular, uma massa molar e do peso molar Massa molecular ( peso molecular ) e uma massa de uma molécula de uma substancia e e Expressa nsa unificadas unidades de massa atómica (u). (1 u E igual a 1/12 da massa de hum átomo de carbono-12) Massa Molar ( molar peso ) E uma massa de Uma toupeira de Uma substancia ê ê expresso em g / mol. Pesos dos Átomos e isótopos São de NIST Artigo . DEIXE Seu comentário Sobre a SUA Experiência com uma calculadora de Peso Molecular Pesos moleculares de Aminoacidos: Relacionados

The formula mass of fe(no3)3 is179.87.

Chemical weathering occurs more rapidly in what kind of climates?

Answers

The water alone can perform chemical weathering with the aid of other chemicals which usually form acids that breaks the internal composition of the material. Hot & cold climates usually cause the flaking the outer layers of a rock (thermal expansion) but it belongs to physical weathering.
However, Physical and chemical weathering work together to disintegrate the rock more easier.
I can't specify a climate well because chemical weathering doesn't involve climate too much.

Which statement would be the most useful for deriving the ideal gas law? Volume is directly proportional to the number of moles. Volume is inversely proportional to the temperature. Pressure is directly proportional to the volume. Pressure is inversely proportional to the number of moles.

Answers

The answer is: Volume is directly proportional to the number of moles.

Given the ideal gas equation: PV = nRT

We can see that pressure (P) and volume (V) are on the left side of the equation, while the number of moles (n), the gas constant (R), and temperature (T) are on the right side.

If you increase/decrease the volume, this results in a direct increase/decrease of the number of moles, which proves the statement true. Volume is also directly proportional to temperature. Pressure is inversely proportional to volume, and directly proportional to the number of moles.

Answer:

Explanation:

Which of the following combinations will result in a reaction that is spontaneous at all temperatures?positive enthalpy change and positive entropy change
positive enthalpy change and negative entropy change
negative enthalpy change and positive entropy change
negative enthalpy change and negative entropy change

Answers

The right answer for the question that is being asked and shown above is that: "negative enthalpy change and negative entropy change." The combination that will result in a reaction that is spontaneous at all temperatures is negative enthalpy change and negative entropy change

Answer:

Spontaneous at ALL Temperatures: Negative enthalpy change and positive entropy change

I promise this is 100% correct. I just took the Honors Entropy quiz and I got the question correct.

The other answer provided by the verified user Hagrid is incorrect.

Why is cellulose so difficult for most animals to digest? A)           they don’t have the proper enzyme to break the bonds between subunits
                B)            cellulose is made up of chitin, which is indigestible
                C)            the bonds holding cellulose subunits together are extremely strong, stronger than in any other macromolecule
                D)           there are many hydrogen bonds holding the subunits together

Answers

The answer is C .Cellulose is a long chain of glucose and to be able to use any of the energy stored in them an organism must break it down into single glucose molecules, and this is why most animals go for a different diet. The chain is very difficult to break down and must be treated with concentrated acids at high temperature. This is a hard task to do and often time needs many stomachs.

Cellulose is so difficult for most animals to digest because they don’t have the proper enzyme to break the bonds between subunits.

Further explanation

Cellulose

It is a polysaccharide compound which is difficult to be digested by animals because they don’t have the enzyme needed to break it. It has many monosaccharide molecules bind together by glycosidic bond.

Glycosidic bond

It is a covalent bond. It is formed between two monosaccharide with the removal of one water molecule. It is of two types, Alpha (between C-1 of one monosaccharide and C-2 of other monosaccharide) and beta (also between the C-1 of one monosaccharide and C-2 of another monosaccharide). Enzymes are required for breakdown of cellulose. In our body various enzymes are present for the breakdown of carbohydrates but these enzymes can never digest cellulose. Our enzymes are unable to break beta glycosidic bond but they can break the alpha glycosidic bond. A bond is present in glycogen and starch so these can be digested by human beings. It is thought that such enzymes are produced by vermiform appendix. In herbivores the enzymes which are required for the breakdown of cellulose are present in their digestive tracts so they can digest cellulose.

Animal which can digest cellulose

Grazing animals like cattle can digest cellulose because they have symbiotic bacteria in their intestine and these bacteria hep them in digestion because of special enzymes in them.

Answer details

Subject: Chemistry

Level: High school

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