Answer:
The correct answer is option C, that is, andesitic.
Explanation:
Andesite is the term used for a fine-grained extrusive rocks family, which are generally light to dark gray in appearance. They generally weather to different shades of brown. Andesite mostly comprises plagioclase feldspar minerals and may also comprise pyroxene, biotite, or amphibole as the dark silicate minerals. It generally does not comprise olivine or quartz.
Why will external fluid flow into a plant cell? because the external water concentration is greater because the external water concentration is less because the external salt concentration is greater because the external salt concentration is less?
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
Some of the oldest rocks ever found have been estimated to be about 3.5 billion years old. Is it likely that these rocks were present when Earth was first formed?
a. No, rock material is constantly recycled on Earth as rock is melted into magma.
b. Yes, most of the rocks on Earth can be dated back to the time when Earth was first formed.
c. No, this rock is probably just a sedimentary rock that was formed by much younger igneous rocks.
d. No, it is likely that any rocks older than a few hundred years are meteorites from outer space.
the answer is A. no, rock material is constantly recycled on earth as rock is meted into magma
What is the percent by mass of water in Na2SO4 • 10H2O?
Use mc003-1.jpg.
5.59%
11.26%
44.08%
55.92%
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 %
What substance is a mixture?
Salt
Gasoline
Aluminum
Carbon dioxide
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.
Beryllium (Be): 1sC2sD, what's C and D?
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]
How does the modern periodic table arrange elements?
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.
A compound contains 71.24 g carbon per 100.0 g compound and has a molar mass of 202.32 g/mol. determine the value of the subscript for carbon in the compound. enter answer as an integer.
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.
0 points what is [h3o +] in a solution made by dissolving 0.200 mole of sodium acetate (nach3coo) in enough water to make one liter of solution?
A horizontal row ( → ) of elements on the periodic table may also be referred to as a:
What is a three-dimensional geometric arrangement of particles within an ionic compound?
Potassium and oxygen will combine to make a compound. K_O_ Fill in the blanks with the number of the subscript.
did you get the answer? there was two boxes what do i put?
Please help me thank you.
Elements in the same __________ are similar due to similarities in their number of valence electrons.
Answer:
Elements in the same __group__ are similar due to similarities in their number of valence electrons.
Explanation:
In the chart, the missing classification term is
A) domain
B) species
C) specimen
D) common name
Kingdom: Animalia
Phylum: Chordata
Class: Marrnalia
Order: Primates
Family: Homindae
Genus: Homo
Sapiens: ?????
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.
What is biological classification?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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A Helium Balloon contains 24.3 moles of Helium Gas. How many grams of Helium is this?
0.165 g
6.01 g
97.2 g
1.46 x 10^25 g
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
object A: has a mass of 2g a volume of .5L
object b: has a mass of 3g and a volume of 5L
water has a density of 1g/L, which object will sink in water?which one Will float? I will you20 points if correct
A newly discovered element, Y, has two naturally occurring isotopes. 90.3 percent of the sample is an isotope with a mass of 267.8 u, and 9.7 percent of the sample is an isotope with a mass of 270.9 u. What is the weighted average atomic mass for this element? 269.4 u 268.1 u 269.0 u 270.6 u
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
What is the volume of 0.0775 mole of nitrogen if the molar volume is 27.6 l/mol?
What is the enthalpy for reaction 1 reversed? reaction 1 reversed: co2→co + 12o2?
calculate the average mass of these three samples: 104.2g, 3.21g, 29.0g.
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
Hydrogen powered cars create less pollution than gasoline powered cars when driven.What might be a challenge to using hydrogen as a fuel?
Answer:
New fueling stations would have to be built that can handle hydrogen
Explanation:
The presence of water will ________ the melting temperature of a rock.
For the following reaction KClO4 → KCl + 2O2 Assign oxidation states to each element on each side of the equation.
Reactant Product K Cl O Which element is oxidized? Which element is reduced?
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).
Explanation: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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The lower the ph of a solution, the ______.
a.greater the number of oxygen atoms
b.more acidic the solution
c.less toxic the solution
d.higher the oh— concentration
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.
Explanation: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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Which of the following is the best name for SO3?
a. sodium trioxide
b. sulfur trioxide
c. monosodium trioxide
d. monosulfur trioxide
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.
Which mass law(s) is/are demonstrated by the observation that a sample of potassium chloride from chile contains the same percent by mass of potassium as one from poland?
a. law of conservation of mass
b. law of definite composition
c. law of multiple proportions
d. laws of conservation of mass and definite composition
e. laws of conservation of mass and multiple proportions?
The correct answer is b. Law of Definite Composition.
Further ExplanationA) 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.
Learn MoreBalancing Equations https://brainly.com/question/2396833Mass Percentage https://brainly.com/question/11085567Keywords: 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.
What is the law of definite composition?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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Which of the following is a physiological adaptation? a. group hunting b. hyoid bone adapted for roaring c. dark coloration d. migration
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.
What type of metal is Potassium (K); Einsteinium (Es); and Tantalum (Ta)?
Why does a weather balloon filled with Helium rise? (Refer to "Densities of Common Substances" table.)
a) Its density is greater than air.
b) Its density is less than air.
What is the main chemical compound cells use for energy?