C) just took test please make brainiliest
Different continents had different rock types supports Wegener's theory of continental drift. Therefore, option (A) is correct.
What is Wegener's theory of continental drift?According to Wegener’s Continental Drift theory, all the continents were united as one single continental mass named a Super Continent, and Pangaea and a Mega Ocean surrounded this supercontinent.
The similarity in geological formations of the southern continent had led Roberto Mantovani that all the continents had once been joined into a supercontinent. Then Wegener noted the similarity between Mantovani's and his own maps of the previous positions of the southern continents.
In Mantovani's conjecture, the continent split due to volcanic activity led by thermal expansion, and the newly formed continents drifted away from each other due to further expansion of the rip zones, where the oceans presently lie.
The continents were separated by the centrifugal pseudo force of the rotation of the earth but calculations showed that the force was not sufficient.
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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
In which orbital does an electron in a bromine atom experience the smallest?
What type of metal is Potassium (K); Einsteinium (Es); and Tantalum (Ta)?
In terms of chemical bonds and electrons, what kinds of changes occur between atoms when substances undergo chemical reactions?
During a chemical reaction there occurs a bond making or bond breaking. Chemical bonds are formed by electron sharing or lose or gain of electrons from atoms.
What is chemical change?A chemical change of a substance is the change in its chemical bond like new bond formation or existing bond breakes in a chemical reaction.There are different types of chemical bonds such as ionic bond, covalent bond, hydrogen bond etc.
Ionic bonds are formed between metals and nonmetal atoms by losing electrons from the metals to the non-metals. Where the atoms are of high electronegativity difference. For example, NaCl is an ionic compound.
Covalent bonds are formed by sharing one or more electrons between atoms based on their valence electrons. For example CH4 is a covalent compound formed by sharing of 4 electrons from carbon and one electron from each hydrogen.
Atoms or molecules when combine together to form products, there occurs regrouping of atoms by bond making or bond breaking by exchange of electrons.
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A chemical reaction involves breaking chemical bonds in reactants and forming new bonds in products, which leads to a change in energy and results in new substances with different properties.
Explanation:During a chemical reaction, there are significant changes in the way atoms are bonded together. The changes can be described in terms of the breaking and forming of chemical bonds and the transfer or sharing of electrons among atoms. Atoms are held together in substances by chemical bonds. During a chemical reaction, these bonds are broken, which leads to the separation of atoms. They subsequently rearrange themselves and form new bonds, resulting in new substances with different properties. The substances we start with are known as the reactants, and the new substances formed are the products. An arrow in the chemical equation represents the direction from reactants to products, which signifies the progression of the chemical reaction. During this process, changes in the energy of the system often occur because breaking old bonds and forming new ones involve either absorption or release of energy.
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
How many protons and electrons are present in the mg2+ ion?
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.
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 changing electronegativity affect bond character?
Final answer:
The bond character changes as electronegativity varies, with greater differences leading to a bond with more ionic character, causing unequal electron distribution and partial charges on the atoms.
Explanation:
Electronegativity is a measure of the tendency of an atom to attract electrons or electron density towards itself. The character of a bond—whether it is ionic, polar covalent, or nonpolar covalent—is determined by the difference in electronegativity between the two bonded atoms. When there is a significant difference in electronegativity, the bond is considered ionic, meaning one atom effectively donates an electron to the other. As the electronegativity difference decreases, the bond becomes more covalent, with electrons shared more equally between atoms. In the case of a polar covalent bond, the electrons are shared unequally, leading to a partial charge on each atom and creating a dipole moment (μ = Qr).
The larger the difference in electronegativity, the more polarized the electron distribution in the bond. This causes the atom with higher electronegativity to have a partial negative charge, while the atom with lower electronegativity has a partial positive charge. In summary, as the difference in electronegativity increases, the ionic character of the bond increases, creating a more pronounced uneven distribution of electron density.
What do oxygen (O) and bromine (Br) have in common? They both tend to gain electrons to gain stability. They both have seven valence electrons. They are both halogens. They are both unreactive.
Oxygen as well as bromine were indeed nonmetals, and the majority of nonmetals tend to prefer up electrons to become more stable.
What is nonmetals?Nonmetals include colorless vapors and glossy, high melting point solids; they are chemical elements that often lacking a majority of metallic qualities.
What is electrons?The electron would be a subatomic particle with a negatively elementary charged electric charge.
Therefore, Oxygen as well as bromine were indeed nonmetals, and the majority of nonmetals tend to prefer up electrons to become more stable.
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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.
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.
which example provide the most complete descripition of an object motion? A. the bird watcher follwed the south trailer of five distance of five kilometers in 45 minutes.
B. The lion had to run at 30 km per hour across the Savannah to caught its prey.
C. The golfer sent the golf ball flying toward the cup to score a hole-in-one.
D. The mixer blended the ingredients for the cake in under two minutes,
The golfer sent the golf ball flying toward the cup to score a hole-in-one, provide the most complete description of an object motion. Therefore, option C is correct.
What is motion ?Motion is the shift in an object's location with relation to its environment over a specific amount of time. The following phrases can be used to describe the motion of an object with mass: distance, displacement, and speed.
Translational motion is the term used to describe how an atom can move from one place in space to another. Additionally, molecules composed of several atoms can vibrate because of chemical bonds, which cause the atoms to move about their equilibrium position like springs.
Oscillatory, rotational, transactional, uniform, non-uniform, periodic, circular, and linear motion are only a few examples of the different motion types that can exist.
Thus, option C is correct.
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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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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:
Please help me thank you.
What is the enthalpy for reaction 1 reversed? reaction 1 reversed: co2→co + 12o2?
Vinegar (C2H4O2) and baking soda (NaHCO3) react to form sodium acetate, water, and carbon dioxide.
C2H4O2 + NaHCO3 ?
How many total carbon atoms are expected in these products?
A. 1
B. 2
C. 3
D. 4
Answer: The correct answer is Option C.
Explanation:
Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form. This means that total mass on the reactant side is equal to the total mass on the product side.
This also means that the total number of individual atoms on the reactant side will be equal to the total number of individual atoms on the product side.
For the given chemical reaction, the reactants are: [tex]C_2H_4O_2\text{ and }NaHCO_3[/tex]
Number of carbon atoms = 3
Number of hydrogen atoms = 5
Number of sodium atoms = 1
Number of oxygen atoms = 5
These number of individual atoms must be present on the product side as well.
Hence, the correct answer is Option C.
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
Designing an experiment your family has planted a garden you o serve that some of the plants in the garden have teeth marks In them what is eating the plants
Explain how calcium, ca2+, and phosphate,po43−, can make a compound with electroneutrality
how do you measure for acidity or alkalinity?
Is a mineral found on a gemology expedition likely to be a substance
What is the volume of 0.0775 mole of nitrogen if the molar volume is 27.6 l/mol?
Complete the equation for the dissociation of cdcl2(aq). omit water from the equation because it is understood to be present.
The dissociation of CdCl2(aq) in the solution is depicted as CdCl2(aq) → Cd²⁺(aq) + 2Cl⁻(aq). It's an essential part of Ionic Chemistry.
Explanation:The dissociation of CdCl2(aq) refers to the process where the compound cadmium chloride, when put in solution (water has been omitted per your instructions), breaks down into its individual ions. This dissociation is represented by the equation: CdCl2(aq) → Cd²⁺(aq) + 2Cl⁻(aq). Here, the CdCl2(aq) molecule breaks apart in water to form one Cd²⁺ cation and two Cl⁻ anions.
The above equation represents the process in Ionic Chemistry where ionic compounds dissociate into their constituent ions in a solution. It's a crucial aspect of the behavior of chemical species in various reactions and processes.
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Humanists believed in comparing people to animals true or false
Answer: False
Explanation:
Humanist believe that humans as well as other living organism has evolved through time and will continue to evolve.
They believe in the happiness and well-being of the human person.
What is a three-dimensional geometric arrangement of particles within an ionic compound?
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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How many grams is in a 5 pound sample? express your answer in scientific notation with four significant figures. (1 pound = 453.592 grams)?
A) 2.3 x 10^3 g
B) 1.1 x 10^4 g
C) 2.27 x 10^2 g
D) 2.268 x 10^3 g
A sample of 5 lb has a mass, expressed in grams, of 2.268 × 10³ g (Option D).
To convert pounds (lb) to grams (g), we need a conversion factor. In this case, the conversion factor is 1 lb = 453.592 g. A mass of 5 lb, expressed in grams, is:
[tex]5 lb \times \frac{453.592 g}{1lb} = 2.268 \times 10^{3} g[/tex]
A sample of 5 lb has a mass, expressed in grams, of 2.268 × 10³ g.
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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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