Eyewash stations should be installed within 25 feet of hazard locations. True or False

the answer is A. no, rock material is constantly recycled on earth as rock is meted into magma

Answer:

The periodic table of the elements is ordered in increasing order of the atomic number of the elements (this is their number of protons) and according to the similarity of their properties.

Explanation:

To classify the similarity in the properties, the elements are arranged in 7 rows, periodic calls, and in 18 columns, called groups.  

The chemical elements are ordered according to their properties from left to right and from top to bottom.

In the same group, all elements have the same number of electrons in their last layer. This makes the chemical properties of the elements very similar.

The period that an element occupies coincides with its last electronic layer. That is, an element with five electronic layers will be in the fifth period. This generates that the elements that are in the same row have different properties but similar masses.

The table is also divided into four groups, according to the orbital that the outermost electrons are occupying, and these groups are named according to the letter of the orbital referred to.

In summary, due to this classification by similarity in their characteristics, the elements are divided into three broad categories: metals, metalloids and nonmetals, which at the same time are divided into subgroups.

Answer:

The Answer is B) species

Explanation:

I just did this on usa test prep and C is wrong

The scientific name of humans is Homo Sapiens. This name is a combination of its genus name Homo and species name Sapiens. Thus the missing classification is species.

The biological classification for all type of living in the biosphere is introduced by Carl Linnaeus. He classified each type of livings into different  classes with 7 categories namely kingdom, phylum, class, order, family , genus and species.

Each category of the classification is based on the structural properties and behaviors of the organisms. Scientific names are provided to each type of organisms to commonly understand them with a standard name.

A scientific name of an organism  is the combination of its genus name and species name. The first word is genus name and the second word is its species name.

The genus name of humans is Homo and specie name is Sapiens. Thus, the scientific name is Homo Sapiens. Therefore, the missing classification is species here.

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Answer:

b. hyoid bone adapted for roaring  is the correct answer.

Explanation:

Hyoid bone adapted for roaring is the example of physiological adaptation.

A physiological adaptation is an adaptation and the control of an organism’s internal body state so that it can adapt to its changing conditions.

A physiological adaptation is an organism’s inner response to outside stimuli to maintain homeostasis state.

Physiological adaptations are the physiological changes in an organism that assist them to sustain.

physiologic adjustment improved the ability of an organism to survive with the uncertain environment.

Answer: 268.1 u

Explanation:

Mass of isotope 1 = 267.8 u

% abundance of isotope 1 = 90.3% = [tex]\frac{90.3}{100}=0.903[/tex]

Mass of isotope 2 = 270.9 u

% abundance of isotope 2 = 9.7% = [tex]\frac{9.7}{100}=0.097[/tex]

Formula used for average atomic mass of an element :

[tex]\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})[/tex]

[tex]A=\sum[267.8\times 0.903+270.9\times 0.097][/tex]

[tex]A=268.1u[/tex]

Therefore, the average atomic mass of an element is, 268.1 u

Answer:

New fueling stations would have to be built that can handle hydrogen

Explanation:

The correct answer is b. Law of Definite Composition.

A) Law of Conservation of Mass

FALSE. This law describes the masses of substances before and after a reaction as constant. Atoms only rearrange in during chemical reactions. None is destroyed nor are any new atoms created. Therefore, the total mass of reactants must always be equal to the total mass of the products.

B) Law of Definite Composition

TRUE. Sometimes called the Law of Constant Composition, this law states that regardless of the source of a compound, its composition is the same. The mass percentages of the elements that make up a particular compound is constant. KCl, in the example, will always have 1 mol of potassium ions and 1 mole of chloride per mole of the potassium chloride regardless of whether it was from Chile or Poland.

C) Law of Multiple Proportion

FALSE. This law describes how an element combines with another element to form multiple compounds. The ratio at which they combine are in whole numbers.

D) Law of Conservation of Mass and Definite Composition

FALSE. The Law of Conservation of Mass pertains to what happens to masses  of substances before and after a chemical reaction. This problem is about different sources of a compound and not about a specified chemical reaction.

E) Law of Conservation of Mass and Multiple Proportions

FALSE. The problem is about the mass percentage of compounds from different sources, not about the reaction of the compound nor other compounds formed by potassium and iodine.

Keywords: Law of Definite Proportion, Law of Constant Composition

Laws gave ideas about conservation, composition, and proportions. The same percent by mass of the potassium in the sample indicates the law of definite composition. Thus, option b is correct.

The law of definite composition states the constant composition of the chemical compound irrespective of the place they are. The ratio of the element in the compound does not vary because of the source and preparatory methods.

The sample of potassium chloride will have the same proportion of potassium in both Chile and Poland as it is a fixed ratio that does not depend on the source. It ensures the uniform preparation of the chemical compound.

Therefore, the sample will have the same proportion of potassium due to the law of definite composition.

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Answer: Option (b) is the correct answer.

Explanation:

Since the given substance is [tex]SO_{3}[/tex], so we can see that there are three oxygen atoms and one sulphur atom.

Therefore, due to three oxygen atoms a prefix 'tri' will be added before the name of oxygen in the name of this given compound or substance.

So, name of cation will be written first and then name of anion will be written.

Therefore, name of [tex]SO_{3}[/tex] is sulfur trioxide.

Answer:

The answer is 12

Explanation:

Carbon has a relative atomic mass of 12. The Carbon content of the compound is 71.24 out of 100 and the molecular mass of the compound is 202.32g/mol. Therefore the amount of Carbon in the entire compound is 71.24/100 * 202.32 =144.132768g.

Since one one carbon is 12g, then, 144.133g will approximately be 12*12. Hence the subscription will be 12.

Under normal conditions, water will move from the solution of lower concentration to the solution of higher concentration. This is called the process of osmosis and is driven by the concentration gradient. So I can identify two answers here:

> because the external water concentration is greater

> because the external salt concentration is less

Answer : The average mass of these three sample is 45.47 g

Explanation :

Average : It is defined as the sum of all the values divided by the total number of values.

[tex]\text{Average}=\frac{\text{Sum of all values}}{\text{Number of values}}[/tex]

As we are given the mass of three samples which are, 104.2 g, 3.21 g, 29.0 g

Now we have to determine the average mass of the given sample.

[tex]\text{Average}=\frac{\text{Sum of all values}}{\text{Number of values}}[/tex]

[tex]\text{Average}=\frac{104.2g+3.21g+29.0g}{3}=\frac{136.41}{3}=45.47g[/tex]

Therefore, the average mass of these three sample is 45.47 g

Answer: b.more acidic the solution

Explanation:

pH is the measure of acidity or alkalinity of a solution.  Acids are substances which gives [tex]H^+[/tex] ions when dissolved in water.

[tex]HX\rightarrow H^++X^-[/tex]

pH is calculated by taking negative logarithm of hydrogen ion concentration.

[tex]pH=-\log [H^+][/tex]

[tex]pH=log\frac {1}{H^+}[/tex]

Thus as pH and [tex]H^+[/tex] are inversely related, a solution having lower pH will have more amount of [tex]H^+[/tex] concentration , a lower amount of [tex]OH^_[/tex] concentration and will be more acidic.

The lower the pH of a solution, the more acidic it becomes. The pH level measures the concentration of hydrogen ions in a solution, and a lower pH indicates a higher concentration, hence a higher acidity.

The lower the pH of a solution, the more acidic the solution becomes. The pH scale, which ranges from 0 to 14, is used to measure the acidity or alkalinity of a solution. A pH of 7 represents a neutral solution, while a pH below 7 is acidic, and a pH above 7 is alkaline (basic). The pH level quantifies the concentration of hydrogen ions (H+) in a solution. Therefore, a lower pH indicates a higher concentration of hydrogen ions, which translates to a higher acidity.

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The answer is 55.92%

Answer : The correct option is, 55.92 %

Solution : Given,

Molar mass of [tex]Na_2SO_4.10H_2O[/tex] = 322 g/mole

Molar mass of water = 18 g/mole

The mass of [tex]10H_2O[/tex] = [tex]10\times 18=180g[/tex]

Now we have to calculate the percent by mass of water in [tex]Na_2SO_4.10H_2O[/tex]

Formula used :

[tex]\text{Percent by mass of water}=\frac{\text{Mass of}10H_2O}{\text{Mass of }Na_2SO_4.10H_2O}\times 100=\frac{180g}{322g}\times 100=55.92\%[/tex]

Therefore, the percent by mass of water in [tex]Na_2SO_4.10H_2O[/tex] is, 55.92 %

did you get the answer? there was two boxes what do i put?

Answer:

C) 97.2g

Explanation:

Information given;

- Calculate Number of moles

- Mass of Helium

Before proceeding, it is important to know the relationship between number of moles, mass and molar mass.

Generally 1 mole of a atom weighs as much as its molar mass. Given that the molar mass of Helium is 4.00g/mol.

It means one mole of Helium weighs 4 g.

How grams then do 24.3 moles weigh?

1 mol = 4.00g

24.3 mol = x g

Cross multiplication yields;

x = (24.3 * 4) / 1

x = 97.2 g

In the given reaction, Chlorine is reduced (its oxidation state changes from -1 to -1), and Oxygen is oxidized (its oxidation state changes from -2 to 0).

In the given chemical reaction, KClO4 is the reactant that decomposes into KCl and 2O2 which are the products. Oxidation states for each element on each side of the equation are as follows, K: +1, Cl: –1, and O: –2 in KClO4, and K: +1, Cl: –1, and O: 0 in KCl and O2. In this reaction, Chlorine (Cl) is reduced from an oxidation state of -1 to -1, while Oxygen (O) is oxidized from an oxidation state of -2 to 0.

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Answer is: gasoline.

Gasoline is a mixture  of many different hydrocarbons: alkanes (paraffins), cycloalkanes  and alkenes (olefins).

Salt and carbon dioxide are chemical compounds, aluminium (Al) is an chemical element.

Pure substance is made of only one type of atom (element) or only one type of molecule, it has definite and constant composition with distinct chemical properties.

Pure substances can be separated chemically, not physically, that is difference between pure substances and mixtures.

Answer:

C is equal to 2 and D is equal to 2.

Explanation:

Here C and D represents number of electrons in 1s and 2s orbitals.

Be has 4 electrons. Now, in order write electronic configuration of an atom, electron filling should be started from orbital with lowest energy.

Energy order of orbital with increasing energy: 1s< 2s< 2p< 3s< 3p< 4s< 3d....

So, filling of electron should start from 1s orbital then 2s, 2p, 3s, 3p and so on.

Each orbital can have maximum of 2 electrons.

So electronic configuration of Be is: [tex]1s^{2}2s^{2}[/tex]

Answer:

Elements in the same __group__ are similar due to similarities in their number of valence electrons.

Explanation: