Carbon-12
Carbon-12 is the reference for all atomic mass calculations. An atomic mass unit is defined as a mass equal to one twelfth the mass of an atom of carbon-12.
PLS I NEED HELP!! Lucia wants to arrange the four states of matter from lowest kinetic energy to highest kinetic energy. How should she arrange them?
A. liquid, solid, plasma, gas
B. liquid, solid, gas, plasma
C.solid, liquid, plasma, gas
D. solid, liquid, gas, plasma
Answer:
Basically, the more hot the state is, the more kinetic energy it will have. This means that answer D. would be right, as it goes from coldest to hottest states!
Answer:
The answer is D. solid, liquid, gas, plasma
Explanation:
Which of the following is the correct name for Cr203?
A. Chromium trjoxide
B. Chromium(III) oxide
O C. Chromium(II) oxide
D. Dichromium trioxide
Answer:
The correct name is Chromium(iii) oxide
What does a particular point on a line of a phase diagram represent ?
Answer:
the line represents the condition where pressure and heat have the same effects.
Answer: C) The melting point of a substance at a specific pressure.
How many electrons does gallium give up when it becomes an ion?
Answer:
3 electrons comrade
Explanation:
Over the evolutionary history of a certain kind of fish, the trend is for an increasing number of teeth. The data table provides information for several examples. A fossil of a new species of this type of fish (W. amatequorum) is discovered. The complete fossil skeleton is found, and it has 34 teeth. The most reasonable estimation for the age of this fossil would be which of the following?
Determine what elements are denoted by 1s22s22p63s23p64s23d104p65s1
Answer:
Rubidium
Explanation:
Rubidium has atomic number 37 and belong to group one alkali metals and has one valence electron at the outermost shell whiz is 5s1
The given electronic configuration is that of element rubidium which is a s-block element with one valence electron.
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
Thus, given electronic configuration is that of element rubidium which is a s-block element with one valence electron.
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Which statement is best supported by the information in the chart?
Atom X will donate electrons to Atom Y.
Atom X will accept electrons from Atom Y.
Atom Y will accept electrons from Atom Z.
Atom Z will donate electrons to Atom X.
Answer:
B
Explanation:
Because , it is the answer .
Based on the information provided in the chart, the statement that is best supported is Atom X will donate electrons to Atom Y. Option A is the correct answer.
Atom X has 6 valence electrons, which means it has 6 electrons in its outermost energy level. Atom Y has 2 valence electrons, indicating that it has 2 electrons in its outermost energy level. In a chemical reaction, atoms tend to either donate or accept electrons to achieve a stable electron configuration. Option A is the correct answer.
Atom X has more valence electrons than Atom Y, suggesting that it is more likely to donate electrons. Since Atom Y has fewer valence electrons, it is more likely to accept electrons from Atom X. Therefore, based on the number of valence electrons, Atom X will donate electrons to Atom Y in order to achieve a stable electron configuration.
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*URGENT* Question 3: Chemical Bonds (1 point)
Match each chemical bond to its correct description. (1 point)
A. Ionic bond
___ Sharing of electrons
B. Covalent bond
___ Freely moving electrons
C. Metallic bond
___ Transfer of electrons
Answer:
A) Ionic bond
___transfer of electrons
B) Covalent bond
___sharing of electrons
C) Metallic bond
___freely moving electrons
The correct match of chemical bonds to its correct description are:
A) Ionic bond - transfer of electrons.
B) Covalent bond - sharing of electrons.
C) Metallic bond - freely moving electrons.
What are chemical bonds?Chemical bonds are the attraction of electrons of different atoms to form a bond. These bonds are the reason for the joining of different atoms and forming of substances and compounds.
There are different types of bonds that are formed according to the different atoms and different types of attraction or joining. These bonds are ionic bonds, metallic bonds, and covalent bonds.
The covalent bonds are the strongest bonds because there is sharing of electrons in them. Ionic bonds transfer electrons to each other. Metallic bonds get the free-moving electrons of the elements.
Thus, the correct match is
A) Ionic bond - c, transfer of electrons.
B) Covalent bond - a, sharing of electrons.
C) Metallic bond - b, freely moving electrons.
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A baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the baby weighs 12 N. The carriage has __________ energy.
A. Kinetic
B. Potential
Answer:
B
Explanation:
The carriage has potential energy
1. Place the molecules in the list in order with the smallest molecules at the top and the largest molecules at the bottom.
= glucose molecule
= starch molecule
= protein molecule
= carbon dioxide molecule
= water molecule
= amino acid molecule
= oxygen molecule
Answer:
Explanation:
In creating this list, one will have to start from the atom (which is the smallest in the list) to the giant polymer (which is the largest in the group). The arrangement below will also be based on there molecular weight.
oxygen molecule (this is the first because it is an atom)
water molecule (this is lighter in weight than carbon dioxide)
carbon dioxide
amino acid molecule (most amino acids have a lesser molecular weight than glucose)
glucose (has a molecular weight of 180.156 g/mol)
protein molecule (several proteins have a lesser molecular weight than starch)
starch molecule (has a molecular weight of 359.33 g/mol)
The arrangement of molecules in the ascending order is: oxygen, water, carbon dioxide, amino acid, glucose, starch, and protein.
• The size of the molecules can be determined by knowing their molecular weights.
• The sum of the atomic weights of the atoms in the molecule is known as the molecular weight of the molecule.
• The molecular weight of water is 18 gram per mole, glucose 180.2 g/mol, starch 360 g/mol, carbon dioxide 44 g/mol, protein 20000 g/mol, amino acid for example glycine 75 g/mol, and oxygen 16 g/mol.
Thus, the molecules can be arranged with the smallest to the largest as oxygen, water, carbon dioxide, amino acid, glucose, starch, and protein.
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{b}
In experiment B. the iron filings weighed 2.0g at the beginning of the experiment
and the iron sulphide produced weighed 2.8g.
Explain this increase in mass.
Explanation:
The increase in mass is because the iron fillings have combined with a sulfide to produce iron sulfide and so the mass will increase.
In such a reaction like this, the mass of the reactants must be conserved. By so doing, the mass of reactants and products must be the same.
When two substances combine together, their masses added up to that of the individual masses. This helps to conserve the mass.
2. Many rings and other jewelry are made of gold. Gold can be found on the periodic table as Au. It has a melting point of 1337K and a boiling point of 3234K. What is gold classified as?
A. An element B. A Compound
C. A Homogenous Mixture D. A Heterogeneous Mixture
A. An element.
As long as it's on the periodic table, it's always an element.
A compound is made up of two or more elements in a chemical reaction, resulting in covenant and/or ionic bonds.
A homogenous mixture (a solution) is a combination of two or more elements physically without causing a reaction (like salt water or applejuice).
Heterogeneous mixtures are physical combinations that mix but don't appear uniform (think of cereal in milk.)
Why a steel ball sinks in water but floats on mercury
Answer:
Mercury is a thick substance and able to sustain and hold anything with any metallics with metal, such as with water it is not working as water is a thin substance and not able to hold heavy things
Explanation:
why is the moisture of cirrus clouds mostly in the solid state
Answer:
Wind is the horizontal movement of air, transporting energy transferred from the earth's surface as sensible and latent heat. Sensible heat is transferred by the processes of conduction and convection. Conduction transfers energy within a substance, and convection transfers energy through the vertical movement of the heated substance. Latent heat is the transfer of energy by transforming the substance itself. As you recall, water has the ability to exist as liquid, gas or solid. The transformation from liquid to gas is called evaporation; the reverse process, from gas to liquid, is called condensation; from liquid to solid is known as solidification (freezing); and from solid to liquid, fusion (melting). Water can also be transformed directly from solid to gas (sublimation), or the reverse, through a process called deposition. We will see these various processes in the formation of clouds.
Explanation:
if I did not give answer then i hope i at least helped!
If a mineral has a metallic shine and scratches, which of its properties are being measured? Choose the two correct answers.
Metals have shiny surface by which they reflect light. The two properties which can be measured from the metallic shine and scratches in a metal are its luster and hardness.
What are metals?Metals are electropositive elements conducts thermally and electrically. Almost all metals shows a shining property when they reflect light and it is called metallic luster.
Hardness of a metal can be a measure how much the metals resists scratches. Very hard metals do not form powders on scratching. Less hard metals may effect by scratches.
More hard and shining metals have various applications such as in construction fields, optoelectronic devices, thermal coatings and corrosion resistant products.
Hence, option a and b, hardness and luster can be measured from the scratches and metallic shining respectively.
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Your question is incomplete, but most probably your full question was:
If a mineral has a metallic shine and scratches, which of its properties are being measured?
choose the two correct answers.
a. luster
b. hardness
c. magnetism
d. cleavage
Listening is a more complex process than hearing.
Arent listening and hearing and listening the same thing.
Which wil be the lower number Atomic Number of Atomic Mass?
-A Whatever
B.DK .
c. Atomic Number
Die Atomic Mass
Answer:
atomic mass
Explanation:
Answer:
The atomic number
Explanation:
The atomic number is the number on the bottom, as for the atomic mass it's the top. You just have to memorize that.
For each successive electron removed from an atom, the ionization energy
Select one:
a. increases.
b. decreases.
C. remains the same.
d. shows no pattern.
the answer is:
a. increases
a. increases.
Ionization energy:The amount of energy required to remove an electron from an isolated atom or molecule.
→ Trend for Ionization energy:
First ionization energy generally increases as you move left to right across a period. This is due to increasing nuclear charge, which results in the outermost electron being more strongly bound to the nucleus.First ionization energy generally decreases as you move down a group. This is because the outermost electron is, on average, farther from the nucleus, meaning it is held less tightly and requires less energy to remove.Thus, for each successive electron removed from an atom, the ionization energy increases.
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A person aims for a target with a wooden bow and arrow. The image shows the path of the arrow to the target. How can the person increase the elastic potential energy in this situation? A) aim the bow higher, increasing the height of the arrows flight. B) sharpen the arrows tip, causing it to strike the target with more force. C) change the bow’s material, increasing the stiffness of the bow. D) pull the arrow farther back, increasing the stretch of the bows string.
Answer:
d
Explanation:
calculate the number of different atoms in 0.2 mol ethene
Answer:
1.204 × 10²³
Explanation:
The number of atoms in a mole is always 6.022 × 10²³, known as Avogadro's number or Avogadro's constant.
To convert moles to atoms, multiply the molar amount by Avogadro's number.
(6.022 × 10²³) × 0.2
= 1.204 × 10²³
Please help me with these questions... please..
Imagine you are a scientist who has just discovered a new element. The element has an atomic number of 113, and it has three elections in the outer energy level of each atom.
Which element would have properties most similar to the new element?
Group of answer choices
A.boron
B.carbon
C.hydrogen
D.beryllium
What would you name this new element?
Answer:
3 valence electrons
The element with the atomic number 113 would fall in the 13th column of the periodic table Group IIIA. This group has an electron configuration that would end as p1 , meaning there would be 3 valence electrons. The valence electrons are the electrons found in the highest energy level in the s and p orbital.
Explanation:
Nihonium has to be the #113 element of the periodic table
A. is the correct answer because Boron has 3 electrons too,
All elements in Group 13 have three electrons in their outermost energy level. The two most popular elements in this group are Boron and Aluminum.
Boron element would have properties most similar to the new element. Therefore, option (A) is correct.
Why do the elements of same group have similar chemical behavior?The chemical properties of elements depend on the number of valence electrons in their valence shell. Elements in the same group in the modern periodic table have the same number of valence electrons. Therefore, chemical elements situated in same group of the modern periodic table have similar chemical behavior.
The chemical elements having an identical outer electronic configuration in their atoms are placed in the same group of the periodic table. These valence electrons of an element are responsible chemical behavior and reactivities of the elements.
Therefore, both Boron and a new element with atomic number 113 have three electrons in their valence shells. So they belong to the same group and will have similar chemical properties.
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PLEASE HELP I'M DOING THIS IN CLASS RIGHT NOW
Explain exactly why metals are such good conductors according to the video you just watched. 2. Which conducts heat more efficiently- a solid, liquid or gas? Why is that (explain on molecular level)?
Answer:
hope this helps have a amazing day! :)
Explanation:
Metals are an excellent conductor of electricity and heat because the atoms in the metals form a matrix through which outer electrons can move freely. Instead of orbiting their respective atoms, they form a sea of electrons that surround the positive nuclei of the interacting metal ions.
A photon of light possesses 5 x 10^-19 J of energy. Calculate its frequency
Answer:
The frequency of photon is 0.75×10¹⁵ s⁻¹.
Explanation:
Given data:
Energy of photon = 5×10⁻¹⁹ J
Frequency of photon = ?
Solution:
Formula;
E = hf
h = planck's constant = 6.63×10⁻³⁴ Js
5×10⁻¹⁹ J = 6.63×10⁻³⁴ Js ×f
f = 5×10⁻¹⁹ J / 6.63×10⁻³⁴ Js
f = 0.75×10¹⁵ s⁻¹
The frequency of photon is 0.75×10¹⁵ s⁻¹.
The mass number is the average mass of all isotopes of that element, while the atomic mass is the quantity of protons and neutrons within one atom/isotope. true or false
Answer:
False
Explanation:
Mass number is the quantity of protons and neutrons within one atom while the atomic mass is the average mass of all isotopes of the element.
Answer:
false :)
Explanation:
How does an increase in reactant concentration affect the rate of reaction?
Answer:
increase the rate of reaction.
Explanation:
Answer:
A. It leads to more frequent collisions, which increase reaction rate.
Explanation:
EDG
How does cold water affect the speed of dissolving?
Answer:
Anything that can be done to increase the frequency of those collisions and/or to give those collisions more energy will increase the rate of dissolving.
Explanation:
depended on the temperature
The length breadth and thickness of a brick is 18cm 8 cm and 5cm respictively find the area of the widest part of rhe brick
Answer:
144cm²
Explanation:
Given dimensions:
Length x breadth x thickness
18cm x 8cm x 5cm
The widest part of this figure will be the face containing the length and the breadth.
The breadth is the width of the figure;
Area of the widest part = length x breadth = 18cm x 8cm = 144cm
The area of the widest part of the figure is 144cm²
If an unknown solution has a pH of 9, what is that solution classified as?
A.Solid
B.Neutral
C.acid
D.Base
Answer:
option A is the ans i think so
If an unknown solution has pH of 9 the solution is classified as a base as it has larger concentration of hydroxyl ions.
What is base?
According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.
Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.
They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.
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How many joules are required to raise the temperature of 55.0 g of H2O(l) from 15°C to 45°C?
A. 8155.3 J
B. 551100 J
C. 1650 J
D. 6903.6 J
Answer: is C=1650j because 45^0 evaluate the power. 1c the coefficient of 1 doesn't have to be written, so the answer particularly be C.
Explanation: I hope that helped !
JANKS is looking under a microscope and sees a colony of green cells living on a spherical structure. She is most likely to be observing a...
A. volvox
B. Amoeba
C. Paramecium
D, Euglena
Answer:
euglena
Explanation:
hope this helps
