Answer:
Lithium has an atomic number Z of 3, so by definition, it has 3 protons. Hence, neutral lithium atoms must contain 3 electrons.
Explanation:
A neutral atom of lithium contains 3 electrons.
The number of electrons in a neutral atom is equal to its atomic number. The atomic number of an element represents the number of protons in its nucleus, and since atoms are electrically neutral (having no net charge), the number of electrons in the atom is also equal to the number of protons.
For lithium (Li), you can find its atomic number on the periodic table, which is 3. This means that lithium has 3 protons in its nucleus, and therefore, it also has 3 electrons to balance the positive charge of the protons. In a neutral atom, the number of electrons equals the number of protons, making lithium, with its 3 electrons, an electrically neutral atom.
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how does the structure of covalent bond affect the structure of covalent compounds
A covalent bond holds two atoms close together because electrons in their outermost orbitals are shared by both atoms.
There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. Therefore, a covalent bond holds two atoms close together because electrons in their outermost orbitals are shared by both atoms.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
Covalent compounds are formed by covalent bond and ionic compounds are formed by ionic bond. Covalent bond is formed by sharing of electron and ionic bond are formed by complete transfer of electron. Ionic bonds are stronger than covalent bonds.
The melting and boiling points are higher in ionic compounds. A covalent bond holds two atoms close together because electrons in their outermost orbitals are shared by both atoms.
Therefore, a covalent bond holds two atoms close together because electrons in their outermost orbitals are shared by both atoms.
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how are cells, tissues, and organs related?
Cells are considered the fundamental units of life. The cells in complex multicellular organisms like people are organized into tissues, groups of similar cells that work together on a specific task. ... At each level of organization—cells, tissues, organs, and organ systems—structure is closely related to function.
Cells are the basic units of life that join together to form tissues, which in turn combine to form organs. These organs, working together, form organ systems and eventually, an organism. Understanding the relationships between cells, tissues, and organs is fundamental in studying biological structures.
Explanation:Cells, tissues, and organs are closely related, as they form the building blocks of all organisms. Cells are the smallest unit of life, and in multicellular organisms, these cells of a similar kind interconnect with each other and perform shared functions to form tissues (for example, muscle tissue, connective tissue, and nervous tissue). Then, several tissues combine together to form an organ (like the heart, brain, or stomach) that carries out a specific function.
Organ systems, such as the circulatory or digestive system, are made up of several organs working in unison. These organ systems functioning together form an organism, like a human or an elephant. Understanding the structure and function of cells helps in the study of tissues, and similarly, understanding tissues aids in comprehending how organs function.
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0.820 L has a mass of 2.56kg what is the density of this liquid in kg/L
Density ρ=[tex]\frac{m}{v}[/tex]
=[tex]\frac{2.56 kg}{0.820 L} \\=3.121kg/L[/tex]
What is the molar mass of 3.45 moles of NO2
I Believe it would be 46.005500
hoped this helped let me know if I'm wrong
Answer: The mass of nitrogen dioxide for given number of moles are 158.7 grams.
Explanation:
To calculate the mass for given number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
We are given:
Moles of nitrogen dioxide = 3.45 moles
Molar mass of nitrogen dioxide = [tex][14+(2\times 16)]=46g/mol[/tex]
Putting values in above equation, we get:
[tex]3.45mol=\frac{\text{Mass of }NO_2}{46g/mol}\\\\\text{Mass of }NO_2=(3.45mol\times 46g/mol)=158.7g[/tex]
Hence, the mass of nitrogen dioxide for given number of moles are 158.7 grams.
What kind of bond is present in HCl
Answer:
ionic
Explanation:
How many atoms of oxygen are in three units of aluminum sulfate
Al2(SO4)3 is the formula for one aluminum sulfate atom.
There is 4 oxygen atoms in one so in 3 they would have 12
12 Oxygen Atoms
Please mark brainliest which would help alot :3
I NEED HELP ASAP PLEASE
Which of the following represents the average kinetic energy of an object’s particles?
Potential energy
Thermal energy
Type of atoms in matter
Type of molecules in matter
I belive it is thermal energy...
Answer:
The Correct Answer is B
Thermal energy
Explanation:
what is a difference between a decomposition ans synthesis/combination reaction
A composition reaction produces a single substance from multiple reactants. A decomposition reaction produces multiple products from a single reactant.
Hope This Helped
The compound 1-butene is modeled here. What would need to happen for molecules of this compound to transform into polybutene? A. Covalent bonds would need to form between the molecules. B. Each molecule would need to gain at least one oxygen atom. C. More double bonds would need to form in each molecule. D. Hydrogen atoms would need to be transferred between molecules.
Answer:
A.
Covalent bonds would need to form between the molecules.
Explanation:
From edmentum
According to the polymerization reactions ,1-butene is transformed to polybutene by formation of more covalent bonds between the molecules.
What are polymerization reactions?The reactions in which large number of monomer molecules react to form polymer are called polymerization reactions.The large molecules which are produced from polymerization may have linear or branched structure.
They can also form a complex three dimensional structure . There are different polymerization reactions like step-growth polymerization, chain -growth polymerization and condensation polymerization.
Polymers containing same kind of monomer are homopolymer and which contain different monomers are heteropolymers. Mechanisms which describe formation of polymers are of different types such as free radical mechanism and chain growth mechanisms.
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If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 258J of energy to the room?
In the first law of thermodynamics, it states when heat is converted into energy, where as the total energy in the room could transform into another but can never be created or destroyed. If you release 258J of energy in the room, 258J would also be removed from the food according to the isolating system.
Your answer would be 258J.
In which of these ways can volcanoes help build up land?
What is the relationship between diatomic molecules and diatomic elements? Name One example of a diatomic element.
Answer:
Diatomic molecules are molecules made of two atoms. The atoms can be of the same element (diatomic elements) like in H2, N2, and O2, or of different elements (diatomic compounds) like in HCl, NaCl, and KBr.
In contrast, monatomic elements consist of single atoms, like Ar, He and Ne.
Write formulas for the binary ionic compounds formed between the following elements: a. Potassium and iodine b. Magnesium and chlorine c. Sodium and sulfur d. Aluminum and sulfur e. Aluminum and nitrogen
The ions are made up of atoms with an overall positive or negative charge as a result of electron gain or loss.
The formulas for various binary ionic compounds are what we wish to write down. To do this, we must take into account the octet's rule.
According to the octet's rule, atoms will either gain, lose, or share electrons to have the electron configuration of the nearby noble gas (8 valence electrons except for He with 2).
Potassium and iodine - KIK will lose 1 electron to create K+ since it possesses 1 valence electron. I will gain 1 electron to produce I because it already has 7 valence electrons. KI is the neutral chemical that exists between K+ and I.
Magnesium and chlorine - [tex]MgCL_{2}[/tex]As Mg has two valence electrons, it must lose two of them to become [tex]Mg^{+2}[/tex] Cl and will gain 1 electron to produce Cl because it already has 7 valence electrons. [tex]MgCl_{2}[/tex] is the neutral molecule between [tex]Mg^{+2}[/tex] and [tex]Cl^{-}[/tex].
Sodium and sulfur - [tex]NA_{2}S[/tex]Na will lose 1 electron to produce [tex]Na^{+}[/tex] since it possesses 1 valence electron. S will gain 2 electrons to create [tex]S^{-2}[/tex]because it has 6 valence electrons. [tex]Na^{2}S[/tex] is the neutral molecule that exists between [tex]Na^{+}[/tex]+ and [tex]S^{-2}[/tex].
Aluminum and sulfur - [tex]Al^{2}S^{3}[/tex]Al will lose 3 electrons to create [tex]Al^{3+}[/tex] since it possesses 3 valence electrons. S will gain 2 electrons to create [tex]S^{-2}[/tex] because it has 6 valence electrons. [tex]Al^{2}S^{3}[/tex] is the neutral molecule that exists between [tex]Al^{3+}[/tex]and [tex]S^{-2}[/tex].
Aluminum and nitrogen - [tex]AlN[/tex]Al will lose 3 electrons to create[tex]Al^{3+}[/tex] since it possesses 3 valence electrons. N will gain 3 electrons to become [tex]N^{3-}[/tex] because it has 5 valence electrons. [tex]AlN[/tex] is the neutral intermediate between [tex]Al^{3+}[/tex] and [tex]N^{3-}[/tex].
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The formulas for the binary ionic compounds are as follows: Potassium and iodine - KI, Magnesium and chlorine - MgCl2, Sodium and sulfur - Na2S, Aluminum and sulfur - Al2S3, Aluminum and nitrogen - AlN.
Explanation:The formulas for binary ionic compounds formed between the given elements are as follows:
Potassium and iodine: When these two elements form a binary ionic compound, the outcome is Potassium iodide. The formula for this is KI. Magnesium and chlorine: The binary ionic compound resulting from Magnesium and Chlorine interaction is Magnesium chloride, represented as MgCl2. Sodium and sulfur: The combination of Sodium and Sulfur results in Sodium sulfide. This is abbreviated as Na2S. Aluminum and sulfur: When Aluminum and sulfur join to form a binary ionic compound, the result is Aluminum sulfide, written as Al2S3. Aluminum and nitrogen: The binary ionic compound formed by Aluminum and Nitrogen is Aluminum Nitride. Its formula is AlN.
Remember that in these compounds, the metal (on the left in the periodic table) loses electrons to become a positive ion, and the non-metal (on the right in the periodic table) gains these electrons to form a negative ion. The compounds are therefore electrically neutral as a whole.
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At catalyst is ______.
A. The product of a combustion reaction
B. Not used up in a reaction
C. One of the reactants in single-replacement reactions
D. A solid product of a reaction
Answer:
The answer A.The product of a combustion reaction
Explanation:
A catalyst is the substance which helps in increasing the rate of a reaction without itself getting consumed in the reaction.
A catalyst changes the path of reaction so that molecules with lower energy can easily participate in the reaction. As a result, formation of products increases.
Thus, we can conclude that out of the given options, a catalyst is not used up in a reaction.
Maple trees and tulips are classified as autotrophs because they both which
a) produce gametes by the process of mitosis
b) produce carbon dioxide and water as metabolic wastes
c) are able to obtain complex organic materials
d) are able to synthesize organic molecules from inorganic raw materials
d) are able to synthesize organic molecules from inorganic raw materials
Hope it helps
Maple trees and tulips are classified as autotrophs because D. are able to synthesize organic molecules from inorganic raw materials.
An autotroph refers to the organism that is able to produce its own food through the use of water, light, and carbon dioxide.
Due to the fact that autotrophs produce their food, they're called producers too. Autotrophs produce their food through the process of photosynthesis. Since maple trees and tulips are also able to synthesize organic molecules from inorganic raw materials, they are autotrophs.
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Identify the reactant and product in tge following chemical reaction: CH4 + 2O2 ➡ CO2 + 2H2O
In the reaction CH₄ + 2O₂ → CO₂ + 2H₂O, methane (CH₄) and oxygen (O₂) are the reactants, and carbon dioxide (CO₂) and water (H₂O) are the products. The number of molecules involved is indicated by the numbers in front of the chemical symbols.
In the chemical reaction CH₄ + 2O₂ ightarrow CO₂ + 2H₂O, the reactants are methane (CH₄) and oxygen (O₂), and the products are carbon dioxide (CO₂) and water (H₂O). The arrow signifies the direction in which the reaction proceeds, with the substances on the left side of the arrow being the reactants and the ones on the right side being the products. No reverse arrow is used, indicating the reaction is shown as proceeding in only one direction. The number '2' in front of O₂ and H₂O tells us that there are two molecules of oxygen and two molecules of water involved in the reaction, whereas no number in front of CH₄ and CO₂ indicates only one molecule of each is involved.
It is important to confirm new scientific findings through _______ that produce _______. This is how scientists know that new findings are reliable and can be accepted.
The confirmation of new scientific findings is achieved through repeated experiments that yield consistent results. This process is central to the scientific method and ensures the reliability of scientific discoveries.
Explanation:It is important to confirm new scientific findings through repeated experiments that produce consistent results. This concept is at the heart of scientific method, a systematic approach to inquiry that aims to minimize of bias and maximize the reliability of findings. Repeating experiments helps to ensure that findings are not due to random chance, experimental errors, or biases. By producing consistent results, we increase the confidence that the findings accurately represent what they are intended to measure, making them more reliable. Thus, replication and reliability are crucial for scientific progress.
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Answer:
Explanation:
multiple investigations; consistent results
What was Johann Dobereiner’s contribution to the development of the periodic table?
He arranged the elements according to increasing atomic mass.
He arranged the elements according to increasing atomic number.
He identified triads of elements that had similar properties.
He organized elements into four groups based on their properties.
He discovered what became known as Dobereiner's triads. For example he noticed that the average of the atomic mass of lithium and potassium was close to the atomic mass of sodium and they had similar properties.
The third choice is the correct one.
Answer:
He identified triads of elements that had similar properties.
Explanation:
He identified a group of there elements that have relatable physical properties such their atomic weight and density. For example in alkali metals such as lithium, sodium and potassium, the atomic weight of sodium is the arithmetic mean of the first and the third element. The same trend was observed with alkaline earth metals (calcium, strontium and barium), halogen (chlorine, bromine and iodine) and chalcogens (sulphur, selenium and tellurium).
Ascorbic acid, or vitamin C (C6H8O6, molar mass = 176 g/mol), is a naturally occurring organic compound with antioxidant properties. A healthy adult’s daily requirement of vitamin C is 70-90 mg. A sweet lime contains 2.88×10−4 mol of ascorbic acid. To determine whether the ascorbic acid in a sweet lime meets the daily requirement, calculate the mass of ascorbic acid in 2.88×10−4 mol of ascorbic acid.
Answer:
5.07×10^-2
Explanation:
in case they want it to be written out instead of the plain answer
PLS HELP
what is the charge of the nucleus? AND HOW DO YOU KNOW?
it’s all the same color with no labels so how do you know if it’s neutrons or protons
Which type of electromagnetic radiation has a lower frequency than infared radiation
a television remote control operates at 319 THz, what is the wavelength of the infrared light in nanometers?
Given:
Frequency (ν) = 319 THz
To determine:
The wavelength corresponding to the given frequency
Explanation:
Wavelength (λ) and Frequency(ν) are related as:
λ = c/ν
where c = speed of light = 3*10⁸ m/s
Now:
SI unit of frequency is Hertz (Hz) also expressed as cycles per second
i.e 1 Hz = 1 s⁻¹
1 Terahertz (THz) = 10¹² Hz
therefore the given frequency ν = 319 *10¹² s⁻¹
λ = 3 * 10⁸ ms⁻¹/319 *10¹² s⁻¹ = 940 * 10⁻⁹ m
since 1 nanometer (nm) = 10⁻⁹ m
The wavelength is λ = 940 nm
Ans: The infrared wavelength = 940 nm
A substance in the solid phase (state) of matter has
A.a definite shape and a definite volume
B.a definite shape,but no definite volume
C.No definite shape,but a definite volume
D.no definite shape and no definite volume
A substance in the solid phase (state) of matter has a definite shape and a definite volume.
What is volume?Volume is the amount of space taken up by an object, while capacity is the measure of an object's ability to hold a substance, like a solid, a liquid or a gas. Volume is measured in cubic units, while capacity can be measured in almost every other unit, including litres, gallons, pounds, etc.
Matter in the solid-state maintains a fixed volume and shape, with component particles (atoms, molecules or ions) close together and fixed into place.
Hence, option A is correct.
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determine the iupac name
Answer:
1-chloro-3-ethyl-2,2-dimethylheptane
Step-by-step explanation:
Here are the rules for naming alkyl halides.
1. Find the longest continuous chain of carbon atoms (see image below).
There are two different seven-carbon chains.
2. If two or more chains are competing for selection as the main chain, select the one that has more substituents.
We choose the chain marked by the blue line .
3. Name the main chain.
The chain has seven C atoms, so its base name is heptane.
4. Identify and name all the substituents.
There are one Cl atom (chloro), two 1C groups (methyl), and one 2C group(ethyl)
5. Number the main chain from the end closest to a substituent.
The C bearing the Cl atom becomes C-1.
5. Identify the substituents by the number of the C atom on the main chain (the locant). Use hyphens between letters and numbers (1-chloro, 2-methyl, 3-ethyl).
6. If there are two or more identical substituents, give the locant for each and use a multiplying prefix. Use commas between two numbers (2,2-dimethyl).
7. Put the names of the substituents with their locants in alphabetical order in front of the base name with no spaces.
The IUPAC name is 1-chloro-3-ethyl-2,2-dimethylheptane.
Investigating a fire scene, you determine several places where fires started. What might you guess about the cause of the fire?
A. It was an electrical fire
B.It was deliberately set
C. An accelerant was used
D. It was an accident
Answer:
B. It was deliberately set!
Explanation:
Just took the test and it was right!
Calculate the energy of a photon of blue light with a wavelength of 4.75 x 10 ^-7 m
480 nm
Explanation:
The key to any frequency and wavelength problem is the fact that frequency and wavelength have an inverse relationship described by the equation
in which group of the periodic table do you find alkali metals?
A. 8A
B.2A
C.1A
D.7A
c, 1A hope this helps
Answer:C
Explanation:
Alkali metals are those elements found in group 1A. They are the very first elements one encounters at the extreme left hand side of the periodic tab!e. They are extremely reactive and are the most electro positive of all the metals. They include; Li, Na, K Rb, Cs, Fr.
which one of these reactions is energy released? A all reactions B no reactions C endothermic reactions D exothermic reactions
The reaction that is energy released is exothermic reactions (answer D)
Explanation
Exothermic reaction is a chemical reaction that releases energy through heat or light.
Example of exothermic reaction is combustion reaction such as lighting a candle which produces carbon dioxide, water and heat.
Endothermic reaction in other hand it is a chemical reaction that absorb energy from the surrounding.
What is the correct chronological order of scientists contributing to the modern periodic table? Lavoisier, Newlands, Moseley, Dobereiner, and Mendeleev Lavoisier, Dobereiner, Newlands, Mendeleev, and Moseley Moseley, Mendeleev, Newlands, Dobereiner, and Lavoisier
Answer: The correct order is :
Lavoisier, Dobereiner, Newlands, Mendeleev, and Moseley
Explanation:
In 1789, the Lavoisier given the periodic table distribution by placing the elements into two groups of metals and non metals.
In 1817, the Dobereiner attempted to classify elements in a periodic table by placing them group of three with similar chemical and physical properties. these groups were named as triads .
In 1864 , the Newlands classified total 62 elements into eight groups according to their respective physical properties. And were also known as Law of Octaves.
In 1869, the Mendeleev classified the periodic table on the basis of atomic mass. In which elements were arranged in increasing order of their atomic masses.
In 1913, Moseley classified the periodic table on the basis of increasing number of protons in the elements.
Answer:
Number 2
Explanation:
From edge
Compare photons and electrons. Which of the following statements is true?
Photons are units or packets of electromagnetic energy. They carry no charge or mass.
While, electrons are constituents of an atom that are negatively charged and associated with a certain mass. In fact, electrons in an atom can get excited when they absorb photons of characteristic energy from electromagnetic radiation.
The similarity between photons and electrons is that both can behave as particles as well as waves.
Ans B