Answer:
John Dalton
Explanation:
John Dalton in 1808 suggested that all matter consists of tiny particles called atoms and that the atoms of a specific element are identical.
He postulated the Dalton's atomic theory which has the following important parts;
All matters consists of indivisible particles called atomsAtoms of the same element are similar and are different from atoms of other elements. Atoms can neither be created nor destroyed. Atoms combine in simple whole ratios to form compounds.Helium is the second most abundant element in the universe, but it is rare in Earth’s atmosphere. Most of the helium used to fill balloons and blimps must be extracted from Earth’s crust. How do you think this helium formed?
Explanation:
Helium is produced in radioactive process that occurs in deep and underground formations. They differ from other atmospheric gases. These radioactive decay of heavier nuclides that are unstable started about the time when the earth was formed.
As they decay they give off lighter particles that can easily be broken down into more stable ones. One of the main product of the decay is alpha particles. They have the same atomic structure as helium These materials are trapped in underground formations.In the following reaction, which species is reduced? Au(s) + 3NO3-(aq) + 6H+(aq) → Au3+(aq) + NO(g) + 3H2O (l) H+ N+5 O2- H2O Au
Answer:
NO3-
Explanation:
Given the reaction equation;
Au(s) + 3NO3-(aq) + 6H+(aq)→Au3+(aq) + 3NO2(g) + 3H2O (l).
We can consider the oxidation states of species on the left and right hand sides of the reaction equation;
Au is in zero oxidation state on the left hand side and an oxidation state of +3 on the righthand side.
NO3- is in oxidation state of +5 on the righthand side and NO2 is in + 4 oxidation state.
H+ is in + 1 oxidation state on both the left and right hand sides of the reaction equation.
Since reduction has to do with a decrease in oxidation number, it follows that NO3- was reduced in the reaction.
which element exists as a diatomic molecule at STP
The elements with standard temperature ,pressure, are the diatomic molecules like hydrogen, nitrogen, chlorine and oxygen.
What is diatomic molecule ?Two atoms are chemically linked in order to create diatomic molecules. They make up a homonuclear diatomic molecule if the two atoms are the same, such in the oxygen molecule (O2), for example in the case. If the atoms are different.
Diatomic molecules are two-atom-only molecules, which can contain the same or different chemical components. A diatomic molecule is a structure made up of two atoms that were already connected together. Examples include carbon monoxide, oxygen, nitrogen, and hydrogen (H2) (CO).
Thus, hydrogen, oxygen, nitrogen are the element exists as a diatomic molecule at STP.
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Element X has an average atomic mass of 64.32 amu. If this element consists of only two isotopes, X-64 and X-65, which isotope is present in the greater abundance? Explain how you can tell.
Answer:X-64 is closer to the atomic mass of 64.32 amu. The one on the periodic table is the isotope most common in nature.
Explanation:
The average atomic mass of an element can be calculated from the percentage abundance and atomic masses of its isotopes. The atomic mass of the element is 64.32 amu which is near to the mass of X-64. Thus the percentage abundance of X-64 will be greater.
What is isotope?Isotopes are atoms of same atomic number and different mass numbers. There many elements which are having both stable and unstable isotopes. The unstable isotopes may undergo radioactive decay and forms a new stable isotope.
Let the fraction of abundance of X-64 be x and the that of X-65 is 1-x. Since total is 100%. Now,
64 (x) + 65 (1-x) = 64.32
x = 0.68.
Thus percentage abundance of X-64 is 68 % and that of X-65 is 100 - 68 = 32 %.
Therefore, the percentage abundance of the element X with isotopes X-64 is having greater abundance.
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Which is the average kinetic energy of the individual particles of a substance?
Answer: Temperature
Explanation: Temperature is a measure of average kinetic energy of particles in an object. The hotter the substance, higher is the average kinetic energy of its constituent particles. When we heat a substance, the particles that constitute the substance gain some energy and begin to move faster.
QUICK! Which best explains how the collisions of materials in space contribute to the formation of layers in protoplanets?
A: The materials undergo decay when they collide, which results in the heating and subsequent melting and rising of materials.
B: The collisions release heat, which results in the heating and subsequent melting, sinking, and rising of materials.
C: The materials undergo decay when they collide, which results in the cooling and subsequent hardening and sinking of materials.
D: The collisions absorb heat, which results in the cooling and subsequent hardening and rising of materials.
Answer:
B. The collisions release heat, which results in the heating and subsequent melting, sinking, and rising of materials.
Explanation:
Got it correct on edge
Answer:
the answer is B: The collisions release heat, which results in the heating and subsequent melting, sinking, and rising of materials.
Explanation:
I took the test
The definition of is the study of quantitative relationships between the amounts of reactants and products.
a)chemical equations
b) stoichiometry
c) molar mass
d)coefficient
Answer:
b) stoichiometry
Explanation:
Stoichiometry is the study of quantitative relationships between the amounts of reactants and products.
The word is coined from two Greek words; stoicheon which means atom and metron which means measurement. It deals with chemical calculations based on the elementary particles of matter. Such calculations highlights the relationships between the composition or chemical reactions of matter and the mole.(100 points) {brainliest}
Solar energy is light and heat from the sun that's harvested to produce electricity or otherwise provide energy. Which of the following statements best describes solar energy?
A. Solar energy is non-renewable because clouds sometimes block the sun.
B. Solar energy is non-renewable because the sun sets each night.
C. Solar energy is renewable because it will be available as long as the sun continues to burn.
D. Solar energy is renewable because it has a small carbon footprint.
Answer:
C
Explanation:
A student measures a volume as 25 ml, wheras the correct volume is 23 mL. What is the percent error?
Answer:
the other number is different
Explanation:
At STP, what is the volume of 4.50 moles of nitrogen gas?
A) 167 L
B) 3420 L
C) 101 L
D) 60.7L
Based on electronegativity, select the molecule with the most ionic character. Group of answer choices SBr2 OBr2 SeCl2 TeI2 SCl2
Answer:
OBr₂
Explanation:
The ionic character depends on the difference of electronegativity between the elements. The higher ΔEN, the greater the ionic character.
SBr₂
ΔEN = |EN(S)-EN(Br)| = |2.5-2.8| = 0.3
OBr₂
ΔEN = |EN(O)-EN(Br)| = |3.5-2.8| = 0.7
SeCl₂
ΔEN = |EN(Se)-EN(Cl)| = |2.4-3.0| = 0.6
TeI₂
ΔEN = |EN(Te)-EN(I)| = |2.1-2.5| = 0.4
SCl₂
ΔEN = |EN(S)-EN(Cl)| = |2.5-3.0| = 0.5
OBr₂ is the molecule with the most ionic character.
Which of the following statements is true? Fusion breaks apart nuclei; fission puts them together. Fission breaks apart nuclei; fusion puts them together. Fission and fusion have identical reactions.
Answers:
Fission breaks apart nuclei
Fusion puts them together.
======================================================
Explanation:
The term "fission" is related to the term "fissure" which means "a cut or divide", often describing a geologic feature of the earth (eg: a crack in the rock).
Fusion is the idea of putting things together, which is the opposite of fission. The term doesn't have to apply to nuclear fusion. It could be something like the fusing of two ideas to create one new idea.
Answer:
the 2nd one
Explanation:
Other than a base and a sugar unit, which of the following is a component of a nucleotide?
A. sulfate group
B. nitrate group
C. phosphate group
D. carbonate group
Answer:
C. phosphate group
Explanation:
took quiz on edg
Answer:
C
Explanation:
EDGE 2022
The diagram shows a conglomerate (mixture) rock. Some of the rock particles are labeled. State which rock group this conglomerate belongs to and explain your answer.
Which of the following are most reactive?
Plzz help mee asapp dmxkxksms
Answer:
1. a part of the soil that contains decayed plant or animal matter
2. erosion
3. topsoil
Explanation:
Hope this helped :)
) A tank contains helium gas at 490 mmHg, nitrogen gas at 0.75 atm, and neon at 520 torr. What is the total pressure in atm?
A) 2.1 atm
B) 0.55 atm
C) 1.0 × 103 atm
D) 1.5 atm
Which equation is balanced using the correct formulas and coefficients?
A. NaCl2 + F2 → NaF2 + Cl2
B. 2 NaCl + F2 → NaF + Cl2
C. 2 NaCl + F2 → 2 NaF + Cl2
D. O NaCl + F → NaF + CI
Answer:
answer is gonna be B
Explanation:
NaCl+F2= NaF+Cl2
What is the frequency of a photon whose energy is 3.4 x 10-19 J?
Answer:
5.13×¹⁴ Hz
Explanation:
The following data were obtained from the question:
Energy (E) = 3.4×10¯¹⁹J
Frequency (f) =?
Energy and frequency are related by the following formula:
E = hf
Where:
E is the energy.
h is the Planck's constant.
f is the frequency.
Thus, we can obtain the frequency of the photon by using the above formula as illustrated below:
Energy (E) = 3.4×10¯¹⁹J
Planck's constant (h) = 6.63×10¯³⁴ Js
Frequency (f) =?
E = hf
3.4×10¯¹⁹ = 6.63×10¯³⁴ × f
Divide both side by 6.63×10¯³⁴
f = 3.4×10¯¹⁹ / 6.63×10¯³⁴
F = 5.13×¹⁴ Hz
Thus, the frequency of the photon is 5.13×¹⁴ Hz.
A 26.9 g rock rolls down the Hill at a speed of 81.9 m/s. what is the kinetic energy of the rock?
Answer:
90.21 J
Explanation:
Given that,
Mass of a rock, m = 26.9 g = 0.0269 kg
Speed of the rock, v = 81.9 m/s
We need to find the kinetic energy of the rock. It can be calculated using the formula as follows :
[tex]E=\dfrac{1}{2}mv^2\\\\E=\dfrac{1}{2}\times 0.0269\times 81.9^2\\\\E=90.21\ J[/tex]
So, the kinetic energy of the rock is 90.21 J.
Which of the two compounds, H2NNH2 and HNNH, has the strongest nitrogen-nitrogen bond, and which has the shorter nitrogen-nitrogen bond.
Answer:
HNNH has both the strongest nitrogen-nitrogen bond and the shorter nitrogen-nitrogen bond.
Explanation:
HNNH has the strongest and shorter nitrogen-nitrogen bond.
We know in chemistry that the shorter a bond is, the stronger is. Also, a triple bond is shorter than a double bond and a double bond is shorter than a single bond.
Having said that, we know that HNNH contains a nitrogen - nitrogen triple bond while H2NNH2 contains a nitrogen - nitrogen single bond.
Since a triple bond is shorter and stronger than a single bond, HNNH has the strongest and shorter nitrogen-nitrogen bond.
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what happens when you push on the wall of a building?
science force and motion?
Answer:
the wall pushes back on you with a FORCE equal in strength to the force you exerted.
mass A moles A moles B particles B Referring to the equation above, how many grams of CH3OH must react in order to produce 17.5 g of H2O
Answer:
17.5 g H2O x 1 mol H2O / 18.01 g H2O x 2 mol CH3OH / 4 mol H2O x 32.04 g CH3OH / 1 mol CH3OH = 15.5 g CH3OH
ANSWER: 15.5 g CH3OHExplanation:
Hi Bash!
I believe we're in the same class because I was trying to understand this as well.
You have a missing piece of information which is the chemical equation the question is derived from. At the top of the study guide, you will find that the equation is: 2 CH3OH + 3 O2 --> 2 CO2 + 4 H2O
The given is 17.5 g of H2O and you're trying to find how many grams of CH3OH must react.
You'll begin by converting the grams of H2O into moles: 17.5 g H2O x 1 mol H2O/18.01 g H2O (18.01 is the molar mass and each mole has a mass of 18.01 g)
Then you will convert the moles of H2O into moles of CH3OH. There are 2 moles of CH3OH as seen in the reactant and there are 4 moles of H2O as seen in the product side : 2 mol CH3OH / 4 mol H2O x 32.04 g CH3OH / 1 mol CH3OH.
Combine all these steps together and you will get: 17.5 g H2O x 1 mol H2O / 18.01 g H2O x 2 mol CH3OH / 4 mol H2O x 32.04 g CH3OH / 1 mol CH3OH = 15.5 g CH3OH
which of the following best defines an acid
1)
Radioactive materials have unstable
A)
nuclei
B)
electrons.
Delectron clouds.
D)
area of atom outside of nucleus.
Which forces can be classified as intramolecular?
London dispersion forces
van der Waals forces
hydrogen bonds
covalent bonds
Answer:
D) Covalent Bonds
Explanation:
Quizlet says so
Among the given options the intramolecular force is covalent bonding. Covalent bond is formed between two nonmetals by sharing of electrons. All other given forces are intermolecular.
What is covalent bonding ?A covalent bond is formed between two non-metals through sharing of valence electrons between atoms. For example carbon and oxygen are non metals forming the covalent compound CO.
The number of shared pair of electron depends on the valence of each atoms. For example in HCl, both atoms shares one electron to each other.
In a covalent compound, if the difference in electronegativity between two atoms is significant, the shared pair of electrons attracts towards the highly electronegative atom and resulting charge separation make them polar compounds.
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Write a complete balanced equation for: magnesium(s) + chloric acid (aq) ? + ?
True or false: Protons have a positive charge, while electrons have a negative charge.
The answer is TRUE
Protons do have positive charge while electrons have a negative charge
Evolution is a
a. idea b. hypothesis c. theory d. law
Answer:
C
Explanation:
Evolution Is a theory.
In scientific reasoning, a hypothesis is an assumption made before any research has been completed for the sake of testing. A theory on the other hand is a principle set to explain phenomena already supported by data. A law is a statement about an observed phenomenon or a unifying concept.
And for sure it's not just an idea because It was proven by many exhibit.
Can someone please tell me the answer
Answer:
52.068 amu
Explanation:
To calculate the average atomic mass of chromium, you have to first multiply the abundance of an isotope with its mass.
49.946 × 0.0435 = 2.173
51.941 × 0.838 = 43.527
52.941 × 0.0235 = 1.244
53.939 × 0.095 = 5.124
Next, add up all of the values, and you will get the average atomic mass.
2.173 + 45.527 + 1.244 + 5.124 = 52.068 amu