The most dense part of an atom is its nucleus. Almost all of the mass in an atom is made up from the protons and neutrons in the nucleus with a minimal contribution from the orbiting electrons.
Helium atom has two orbital electrons and two protons and two neutrons in nucleus. It has 4 atomic mass and 2 atomic numbers. So, the greatest concentration of atomic mass is in nucleus.
Which of the following statements does not describe the structure of an atom?
Inside the nucleus of an atom are protons and neutrons.
Protons are positively charged sub-atomic particles.
Electrons are negatively charged sub-atomic particles.
Most of the mass of an atom comes from the electron cloud.
Answer:
Most of the mass of an atom comes from the electron cloud
Explanation:
Protons are positive, Electrons are negative, and there are only protons and neutrons in the nucleus of an atom. Also there are only 6 electrons in a electron cloud and the mass of an electron is 1/1,836 the mass of a proton. So it would be the last answer.
Regarding the structure of an atom, it is false that most of the mass of an atom comes from the electron cloud.
Let's consider which of the following statements does not describe the structure of an atom.
Inside the nucleus of an atom are protons and neutrons. TRUE. The nucleus is formed by protons and neutrons surrounded by the electron cloud. Protons are positively charged sub-atomic particles. TRUE. The relative charge of protons is +1. Electrons are negatively charged sub-atomic particles. TRUE. The relative charge of electrons is -1. Most of the mass of an atom comes from the electron cloud. FALSE. The mass of electrons is negligible in comparison with protons and neutrons. Most of the mass of the atom comes from the nucleus.Regarding the structure of an atom, it is false that most of the mass of an atom comes from the electron cloud.
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Which of these is an example of physical change?
Melting a Substance
Breaking chemical bonds
Forming chemical bonds
Nuclear decay
Melting a substance is an example of physical change. Thus option A is correct.
What is physical change?Change is defined as the act, procedure, or outcome of changing: for instance. Change refers to a shift in the weather, transformation refers to a period of profound social change, and substitution refers to a change in the environment.
Change can also be defined as a procedure whereby one or more compounds are chemically transformed into others.
There are two types of changes.
Chemical change - It is defined as a transformation of one material into another, the formation of new materials with distinct properties, and the creation of one or more new substances.Physical change - It is defined as a sort of transformation in which the composition of matter changes but no new material is created. Cutting, bending, dissolving, freezing, boiling, and melting are some of the example of physical change.Thus. melting a substance is an example of physical change. Thus option A is correct.
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what is the mass of 4.00 cm3 piece of sodium chloride having a density of 2.16 g/cm3 chemistry
Answer : The mass of sodium chloride is, 8.64 grams
Explanation : Given,
Volume of sodium chloride = [tex]4cm^3[/tex]
Density of sodium chloride = [tex]2.16g/cm^3[/tex]
Formula used :
[tex]\text{Density of }NaCl=\frac{\text{Mass of }NaCl}{\text{Volume of }NaCl}[/tex]
Now put all the given values in this formula, we get mass of sodium chloride.
[tex]2.16g/cm^3=\frac{\text{Mass of }NaCl}{4cm^3}[/tex]
[tex]\text{Mass of }NaCl=8.64g[/tex]
Therefore, the mass of sodium chloride is, 8.64 grams
Which two forms of heat transfer work together to heat water in a plastic bottle
The two forms of heat transfer that work together to heat water in a plastic bottle are conduction and convection.
Heat transferHeat is transferred through solid materials by a process known as conduction.
In liquids, heat is transferred by convectional currents.
For water in a plastic bottle, heat will first have to travel through the solid plastic bottle by conduction before heating the water inside the bottle by convection.
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URGENT PLEASE HELP!!!
During an investigation a scientist heated 27 g of mercuric oxide till it decomposed to leave a dry product. The total mass of the product formed was 25 g. Does the law of conservation of mass hold true in this case? Use complete sentences to justify your answer based on numerical calculations.
Answer:Yes, the law of conservation of mass is true because even though some/2grames of mass was not there to end the 2 grams might have evaporated or escaped.
Explanation:
I got this right on flvs and more explanation is up there kinda. hope this helps
which of these is a mixture?
salad
sugar
water
potassium
Answer:
salad
Explanation:
A mixture is a substance that combines two or more substance that are physically combined. A mixture can be easily seperated by a physical means . A mixture is the combination of various substances that are not chemically combined .Examples of mixtures are cake and salad . The cake contains various substances like egg, flour and sugar. This mixture can be easily separated into it individual entities by a physical means .
Base on the option the only mixture among the option is salad . Salad is a a mixtures that combines substances like tomatoes , fruits and vegetable. The individual substances that makes up the salad can be easily separated.
Sugar is a compound . Water is a compound as it contains two elements and potassium is an element.
What Element is found in column 16, period 2?
Which of these substances are molecules?
1. H2O
2. NaCl
3. N2
4. O2
Question 12 options:
3 and 4
All of them
1 and 2
None of them
The answer is; All of them
A molecule is a stable chemical unit (with neutral charge) of atoms chemically bonded together (these bonds can be covalent, metallic, ionic, and etcetera). The molecule can, therefore, be of an element (contain atoms of the same element – in this case, N2 and O2) or a compound (atoms of different elements- in this case, H2O and NaCl).
moles of phosphorous in 15-35-15 fertilizer in 10g
The composition of a fertilizer is usually express in NPK number. NPK number is in terms of Percent by mass of the said element which are Nitrogen, Phosphorus and Potassium. A 15-35-15 fertilizer has 15% Nitrogen, 35% Phosphorous, and 15% Potassium by mass. If you have 10 g of this fertilizer, to get the number of moles of phosphorus, you multiply the mass by 35%, which is equal to 10*0.35 or 3.5 g phosphorus. Then you divide the calculated mass of phosphorous by its molar mass which is 30.97 g/mol. Therefore, you have 3.5/30.97 which is equal to 0.1130 mol Phosphorus. This is the amount of Phosphorus in moles in the fertilizer.
How many grams of CaCl2 are in 250 mL of 2.0 M CaCl2?
How many moles of KNO3 are in 500 mL of 2.0 M KNO3?
1 mol KNO3
How many grams of CaCl2 are in 250 mL of 2.0 M CaCl2?
55 g CaCl2
What volume of a 6.67 M NaCl solution contains 3.12 mol NaCl? 0.468 L
How do you know if a reaction is endothermic?
a model is any representation of an object or
How does the understanding of the structure of the atom help you see both unity and diversity in forms of matter?
Understanding the structure of atoms reveals unity in the form of consistency of atomic properties within the same element and diversity in the unique structures and behaviors of atoms across different elements. This combination of unity and diversity is essential in explaining the wide range of properties and behaviors observed in different forms of matter.
Explanation:Understanding the structure of an atom provides insight into both unity and diversity of matter. An atom, being the smallest component of an element retains all of the chemical properties of that element, illustrating unity because every atom of the same element is identical and exhibits the same properties. The structure of an atom consists of a nucleus, which is surrounded by electrons.
The nucleus contains protons and neutrons, and these substructures determine the characteristics of atoms including its interactions and stability.Dalton's atomic theory, with its principles of law of conservation of matter and indivisibility, further explains unity in the types and characteristics of atoms across different elements.
On the other hand, diversity is highlighted by different elements having unique atomic structures which produce different types of atoms. This diversity results in vast differences in physical properties across various forms of matter. By observing the atomic substructure, it is possible to understand why some elements are metals, others are nonmetals, and yet others are semiconductors. Furthermore, the behavior of atoms during combinations, for example, ionic or covalent bonding, provides another layer of diversity as it results in a vast array of complex molecules with distinct characteristics.
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How does atomic radius change within groups and across periods in the periodic table
Heterogeneous mixtures can be physically separated into their individual components. True False
An atom has 16 protons and 16 neutrons. Which of the following could be the symbol for that atom, including its mass numbe? Consult the periodic table.
A. 35CL
B. 32S
C. 32Cl
D. 35S
Answer:
Option b. 32S
Explanation:
Given:
No. of protons = 16
No. of neutrons = 16
Atomic number of an element is equal to the number of protons present in it.
Therefore, atomic number of the element = 16
Mass number of the element is equal to sum of number of protons and neutrons.
Therefore, Mass number = 16 + 16 = 32
Element 'S' has atomic number 16 and its mass number is 32.
So among the given options, option b is correct.
1.which of the following correctly describes carbon, represented by c?
It is an element because it is made of atoms that are all the same type
It is a compound because it is made of different types of atoms that are chemically joined together.
It is a mixture because it is made of different type of atoms that are not chemically joined together.
2. Which of the following correctly describe carbon dioxide represented by CO2
It is an element because it is made of atoms that are all of the same types
It is a compound because it is made of different types of atoms that are chemically joined together.
It is a mixture because it is made of different types of atoms that are not chemically joined together.
describe one way lack of water affect cell function
write the symbols for the ions that form when potassium and iodine react to form the ionic compound potassium iodide?
The symbols for the ions that form when potassium and iodine react to create potassium iodide are K+ for potassium and I- for iodine. These ions combine to form the compound with the chemical formula KI.
Explanation:When potassium and iodine react to form the ionic compound potassium iodide, the symbols for the ions involved are K+ for the potassium ion and I- for the iodine ion. Potassium, being in group 1 of the periodic table, loses one electron to form the K+ ion, while iodine, in group 17, gains one electron to form the I- ion. This transfer of electrons results in the formation of an ionic bond between the two ions.
Potassium iodide is represented by the chemical formula KI, indicating that there is a one-to-one ratio of potassium ions to iodine ions in the compound.
Final answer:
The symbols for the ions are K+ for potassium and I- for iodine, which together form the ionic compound potassium iodide (KI).
Explanation:
The symbols for the ions that form when potassium and iodine react to form the ionic compound potassium iodide are K+ and I−. Potassium, which is in group 1 of the periodic table, loses one electron to form a K+ ion. Iodine, on the other hand, is in group 17 of the periodic table and gains one electron to form an I− ion. When these two ions combine, they form the ionic compound potassium iodide (KI).
HELP!!!!! a car traveling at a constant 50 miles per hour turns left on the interstate. what is happening here? A) nothing because the speed is constant B) velocity because the direction is changing C) acceleration because speed is constant but, direction is changing D) displacement because the car is moving
Answer is: B) velocity because the direction is changing.
Velocity is equivalent to a specification of its speed and direction of motion, for example 100 km/h to the east.
Velocity is a physical vector quantity (measured in metres per second) and need magnitude and direction to define it, for example 100 metres per second east.
Vegetable oil has the density of .92 g/mL and honey has the density of 1.42 g/mL. Which liquid will float?
Which one is a true statement about exothermic reactions?
A. Energy from an outside source is continuously being added
B. The reaction container always feels cold
C. The reactants have more heat energy than the products
D. More heat is given off then is put into the reaction
Water plays a key role in chemical weathering by
a.
dissolving minerals
c.
contributing to the oxydation process
b.
transporting minerals
d.
all of the above
Which one is a true statement about exothermic reactions?
A. Energy from an outside source is continuously being added.
B. The reaction container always feels cold.
C. The reactants have more heat energy than the products.
D. More heat is given off than is put into the reaction.
Determine the enthalpy for this reaction: Al(OH)3(s)+3HCl(g)→AlCl3(s)+3H2O(l)
To calculate the enthalpy of the given reaction, understanding of stoichiometry, bond energies and the concept of enthalpy changes in chemical reactions is utilized. The reaction has stoichiometric amounts of reactants, leads to formed stronger bonds in the products, and is exothermic.
Explanation:To determine the enthalpy for the given reaction: Al(OH)3(s)+3HCl(g)→AlCl3(s)+3H2O(l), firstly, for the reaction of 0.0500 mol acid (HCl), we know that q = -2.9 kJ. Since the reactants are provided in stoichiometric amounts (the same molar ratio as in the balanced equation). The enthalpy change is proportional to the amount of acid neutralized: ΔH = -2.9 kJ/0.0500-mol HCl.
Use the standard molar enthalpy of formation of HCl(g), ΔH, of -92.307 kJ/mol. This excess energy is released as heat, indicating that this reaction is exothermic. The bond formation and breaking are a part of this process, creating H-Cl bonds which release more energy than they consume.
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What is hydrolysis,and what type of weathering is it
Place the events in order as the temperature of a gas in a container slowly increases .
The events in order as the temperature of a gas in a container slowly increases are -
The molecules of the gas begin to gain kinetic energy.
The fast-moving molecules strike the sides of the container more often.
The molecules striking the sides increase the pressure of the gas.
The molecules of gas use increased energy to move more quickly.
The container breaks open under extreme pressure.
As the temperature of a gas in a container increases, the gas molecules gain kinetic energy and move faster. This leads to more frequent and energetic collisions with the container walls, causing an increase in pressure inside the container.
With further temperature rise, the gas molecules gain even more energy, moving more rapidly and colliding with greater force. If the temperature and pressure exceed the container's structural limits, it may break open.
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What is the chemical name and formula of a compound that has one carbon atom and four chlorine atoms?
carbon tetrachloride; CCl4
chlorine carbide; Cl4C
carbon chloride; Cl4C
monocarbon tetrachloride; CCl4
The correct chemical name and formula for a compound that has one carbon atom and four chlorine atoms is carbon tetrachloride, represented by the formula CCl4. Therefore option 1 is correct.
"carbon tetrachloride; CCl4," is the correct answer. Carbon tetrachloride is a compound composed of one carbon atom (C) bonded to four chlorine atoms (Cl).
The prefix "tetra-" indicates that there are four chlorine atoms, and "chloride" refers to the chlorine ion. Therefore, the name "carbon tetrachloride" accurately describes the compound's composition.
Thus, the correct chemical name and formula for a compound with one carbon atom and four chlorine atoms is carbon tetrachloride (CCl4).
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The substance that gets broken down in a homogeneous mixture is the (A)colloid (B)solution (C)solvent (D)solute
To function on their own, unicellular organisms must do what?
Make tissues
Perform a specialized task
Work with other cells
Do all jobs for survival
PLEASE NO INCORRECT ANSWERS AND PLEASE ANSWER QUICKLY