Answer:
C. A person running 100 m straight across a field at a constant speed.
Explanation:
Acceleration is defined as the change in the velocity per unit time. Velocity have both direction and magnitude (speed) . So, acceleration involves both change in direction and speed.
A). The satellite is in a curved orbit, so direction of satellite is constantly changing. Hence, not the answer.
B). The car is following a curve, so its direction is changing. Hence, not the answer.
C). The person is running straight at constant speed which means no change of speed or direction. Hence, it is the answer.
D). The person is on curved track, so his/her direction is changing. Hence, not the answer.
The atomic and mass numbers for four different atoms are given below. Which two are isotopes of the same element?
Atom
Atomic Number
Mass Number
A
100
258
B
101
258
C
101
260
D
102
259
A and B
C and D
B and D
B and C
Which of these elements has two electrons in its outer P orbitals?
Helium
Barium
Nitrogen
Silicon
Sulfur
Which is not true about the liquid state of matter?
A. The liquid state has a definite volume and a definite shape.
B. The liquid state takes on the shape of its container.
C. The liquid state has a definite volume and an indefinite shape.
D. The particles in a liquid can easily move past each other.
Answer: Option (A) is the correct answer.
Explanation:
In liquids, the molecules are held by less strong intermolecular forces of attraction as compared to solids. Due to which they are able to slide past each other. As a result, they have some amount of kinetic energy which is greater than that present within molecules of a solid.
Due to this a liquid is able to occupy the shape of container in which it is placed. Hence, a liquid substance will always have a definite volume but not fixed shape.
Thus, we can conclude that the statement liquid state has a definite volume and a definite shape, is not true about the liquid state of matter.
The incorrect statement about the liquid state of matter is that it has a definite volume and a definite shape. In reality, liquids have a definite volume but take on the shape of their container, therefore they do not have a definite shape.
Explanation:The statement which is not true about the liquid state of matter is:
A. The liquid state has a definite volume and a definite shape.
This statement is incorrect because liquids do not have a definite shape; they take the shape of their container. In the liquid state, the particles have enough energy to partially overcome intermolecular interactions allowing them to move about while remaining in close contact, which gives the liquid a definite volume but an indefinite shape. Liquids are known for their characteristics of adapting to the shape of their container while retaining a fixed volume, similar to mercury, which is unique for being a metal that is liquid at room temperature and exhibiting high surface tension.
Water vapor turning to frost is an example of __________. question 6 options: condensation deposition evaporation sublimation save
The correct answer is sublimation.
help this helps :)
How much of a 100.0 g sample of 198au is left after 8.10 days ifi its half life is 2.70 days?
Answer:
The answer is 12
Explanation:
Choose three scientists that were involved in developing atomic theory
What happen once intercellular signals reach the inside of the cell using some type of receptor
A. The signal stops
B. The signal produces a protein
C. The signal is transferred to the cytoplasm
D. Intercellular communication takes over
Correct option is B.
B. The signal produces a protein
Explanation:There are many kinds of signals that reach the inside of cell. Every signal carry some important message regarding the functioning of cell or any other part of body. Normally signals that penetrate in the cell translate a protein to carry out their function. So, signals actually stimulate the machinery of the cell and make it to produce the protein of its own desire.
Once intercellular signals reaches inside of the cell by the receptor then it helps in the intercellular communication among each other.
Further Explanation:
The receptors are usually the proteinaceous structure that resides over the surface of the cell as well as present inside it. It receives signals in various forms. These signals may only interact with the receptor on the outer surface of the cell or it may reach inside the cell and interact with the receptor molecule. The interaction may result in the manipulation in the transcription process as some of the genes will be stimulated to transcribe into the protein or some may get inhibited.
There can by different types of signal molecule. They are:
1. Autocrine: These signals are produced by the cell type to which the signaling molecule get attached. Therefore they acts over self-cell. This kind of signaling happens in the early development of an organism.
2. Paracrine: These signals produced by the signaling cell acts locally on the cell that lies closer to them.They generally produces faster response.
3. Endocrine: These signals travels to the longer distance and acts over the cells residing over there. They generally produces slower response.
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Answer Details:
Grade: College Biology
Subject: Biology
Chapter: Signal transduction
Keywords:
Intercellular signals, receptor, intercellular communication, transcription, autocrine, cell, organism, paracrine, endocrine.
Estimate the volume, v, of one sodium atom (na) using its metallic radius of 186 pm. express your answer with the appropriate units.
The volume of one sodium atom with a metallic radius of 186 pm is [tex]\boxed{26965110.857\;{\text{p}}{{\text{m}}^3}}[/tex]
Further explanation:
The smallest particle that is the building block of matter is known as an atom. Most of the space in an atom is empty and its mass is concentrated inside a small region called the nucleus.
Protons, electrons, and neutrons are the three subatomic particles that are present in the atom. Electrons revolve around the nucleus in definite orbits.
The measure of the size of the atoms is known as its atomic radius or atomic size and is defined as the distance from the nucleus to the outermost shell that contains the electrons.
Types of atomic radius:
1. Covalent radius
Half of the internuclear separation between the nuclei of the two single-bonded atoms of the same species is termed as a covalent radius.
2. Van der Waals radius
It is half of the distance between two unbonded atoms when these have balanced electrostatic forces of attraction.
3. Metallic radius
Half of the distance between the nuclei of two atoms in a crystal is called a metallic radius.
Consider the sodium atoms to be spherical. The formula to calculate the volume of spherical sodium atoms is as follows:
[tex]{\text{V}} = \frac{4}{3}{\pi }}{{\text{r}}^3}[/tex] …… (1)
Here,
V is the volume of sodium atoms.
r is the radius of the sodium atom.
The value of r is 186 pm.
Substitute this value in equation (1).
[tex]\begin{aligned}{\text{V}}&=\left( {\frac{4}{3}}\right) \times \left( {\frac{{22}}{7}} \right) \times {\left( {{\text{186 pm}}}\right)^3} \\&=\left( {\frac{{88}}{{21}}} \right) \times 6434856\;{\text{p}}{{\text{m}}^3} \\&=26965110.857\;{\text{p}}{{\text{m}}^3} \\ \end{aligned}[/tex]
Therefore, the volume of one sodium atom with a metallic radius of 186 pm is [tex]\boxed{26965110.857\;{\text{p}}{{\text{m}}^3}}[/tex]
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Solid State
Keywords: volume, sodium atom, 186 pm, radius, metallic radius, atomic radius, 26965110.857 pm3, atomic radius, covalent radius, van der Waals radius.
At which stage(s) in meiosis is DNA condensed into chromosomes? prophase I only, prophase I and II, metaphase I and II, metaphase II only
Without doing any calculations, list the elements in c2h4o2 in order of decreasing mass percent composition.
Both renewable and nonrenewable resources are used within our society. How do the uses of nonrenewable resources compare to the uses of renewable resources?
a.
Nonrenewable resources have more applications than renewable resources.
b.
Certain types of renewable energy can be used for as many applications as certain types of nonrenewable resources.
c.
There are more sources of nonrenewable energy than renewable energy.
d.
Nonrenewable resources have fewer applications than renewable resources.
Renewable sources are which can be gained again and again from nature
for example : sun energy or wind energy
non renewable: these once consumed cannot be regained
example : fossil fuels
Now both can be used for many kinds of applications however the resources so we can say that Certain types of renewable energy can be used for as many applications as certain types of nonrenewable resources
Answer:
A.
Explanation:
Red blood cells contain an enzyme called carbonic anhydrase, which catalyzes the reversible reaction whereby carbon dioxide and water are used to form carbonic acid.
Which of these expressions are correct variations of the combined gas law?
Answer:
Both p2=p1(t2/t1)(v1/v2) and p1v1t2=p2v2t1
Explanation:
What can be removed from an atom if ionization energy is supplied?
an electron
a proton
an ion
a neutron
Why is it important to know the properties of baking ingredients?
PLEASE HELP!!!!!!! :C :C :C
The mixture you separated was a mixture of iron filings, sand, and salt. Based on your understanding of matter, is this mixture a homogenous mixture or heterogenous mixture? How do you know?
A.)homogenous mixture-the parts are uniformly mixed
B.)homogenous mixture-the parts are not uniformly mixed
C.)heterogenous mixture-the parts are uniformly mixed
D.)heterogenous mixture-the parts are not uniformly mixed
Hey Friend, I think the answer is C give me Brainlist If correct thanks
What will the ratio of ions be in any compound formed from a group 1a and a group 7a nonmetals?
According to the electronic configuration and valency, ratio of ions in compound formed of group 1 and group 17 is 1:1 as they both have charges +1 and-1 respectively.
What is electronic configuration?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.
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Is dimethyl amine and triethylamine more soluble in water?
Final answer:
Dimethylamine is more water soluble than triethylamine due to its smaller size and ability to form hydrogen bonds more easily, making it dissolve better in water.
Explanation:
The question asks which compound, dimethylamine or triethylamine, is more soluble in water. Water solubility in amines is influenced by the length of the carbon chain and the molecule's ability to form hydrogen bonds. Smaller amines with fewer carbon atoms, such as dimethylamine, are typically more soluble in water compared to larger amines with more carbon atoms, like triethylamine. Molecules like dimethylamine that can form hydrogen bonds easily dissolve in water, whereas triethylamine, which is bulkier and less able to engage in hydrogen bonding, is less soluble. Therefore, dimethylamine would have a higher solubility in water than triethylamine. The basicity of amines also affects their water solubility as they can dissolve in dilute mineral acid solutions, which is useful for the separation of amines from non-polar solvents.
What physical properties do dry ice and water ice have in common?
Dry ice and water ice are both forms of solid matter, thus, they share similar properties such as having a fixed shape and being incompressible. One of their notable shared attributes is their ability to undergo the process of sublimation.
Explanation:Both dry ice (solid carbon dioxide, CO₂) and water ice are forms of solid matter, which means they are composed of atoms, molecules or ions and their particles are closely packed together. As a result, they share some physical properties. For instance, both dry ice and water ice have a fixed shape and are generally incompressible.
Both substances can also undergo sublimation which is a process where a substance transitions directly from a solid to a gas, bypassing the liquid state. For dry ice, it sublimes at room temperature and pressure, while water ice requires temperatures below its melting point to sublime. This process may be visible as mist or frost in the air.
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what is the theoretical yield of hydrogen gas if 5.00 mol of zinc are added to an excess of hydrochloric acid?
Answer:
Theoretical yield of H2 = 10.0 g
Explanation:
Given:
Moles of Zn added = 5.00
To determine:
The theoretical yield of H2 gas
Calculation:
The balanced reaction between Zn and HCl is as shown below:
[tex]Zn + 2HCl \rightarrow ZnCl2 + H2[/tex]
Based on the reaction stoichiometry:
Since HCl is in excess, the limiting reagent is Zn. Thus,
1 mole of Zn will produce 1 mole of H2
Accordingly, 5 moles of Zn will produce 5 moles of H2
Molar mass of H2 = 2 g/mol
Mass of H2 produced = [tex]Moles * Molar\ mass = 5.00 mol*2 g/mol = 10.0 g[/tex]
How does the percent of an acid in a water solution affects the ph of the solution?
A parent who is convinced that children have rights that ought not to be interfered with by adults is most likely:
An iron fence is left unpainted, and it reacts to the oxygen in the air, forming rust. the formation of rust is an oxidation-reduction reaction, but it also is an example of a?
Answer: synthesis
Explanation:the answer given earlier does have a comment on it correcting but I missed that the first time I visited this question.
Why do your feet feel cooler on a tile floor than on a warm rug?
The tile is a poor conductor.
The rug is a good conductor.
The tile is a better insulator than the rug.
The rug is a better insulator than the tile.
Answer:
Option d
Explanation:
The question is to find the reason why our feet feel cooler on a tile floor than on a warm rug.
The reason is
i) the tile is a better heat conductor and it moves our body heat faster away from our skin.
ii) The rug is a good insulator and hence it slows down the flow of heat from our skin of touch and hence we feel warmer
So out of the four options
option d is right.
The rug is a better insulator than the tile.
If 50.75 g of a gas occupies 10.0 l at stp, 129.3 g of the gas will occupy __________ l at stp.
Answer: 25.5 L
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 Liters at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
We are given:
50.75 g of a gas occupies = 10.0 L at STP
Thus 129.3 g of a gas occupies =[tex]\frac{10}{50.75}\times 129.3=25.5L[/tex] at STP
Thus 129.3 g of gas will occupy 25.5 L at STP.
A population expert makes a graph to show the future rates of population growth in various countries. Which is necessary a source of error for him?
Final answer:
The unpredictability of various factors impacting population changes poses challenges in accurate projections made by population experts.
Explanation:
One necessary source of error for a population expert making future population growth graphs is the unpredictability of factors affecting population changes. These factors include birth rates, death rates, migration, and resource limits impacting population growth. Additionally, mitigation measures undertaken by countries or unforeseen events altering societal dynamics can lead to inaccuracies in long-range population projections essential for planning purposes. Population forecasts attempt to estimate growth rates, but unpredictable changes in fertility, mortality, and migration rates can pose challenges in accurate projections.
An atom’s chemical behavior is determined mostly by its _______. A. number of protons B. number of neutrons C. number of electrons D. number of valence electrons E. None of the Above
The chemical behaviour of an atom is primarily determined by the number of its valence electrons, which are the ones that participate in chemical reactions.
Explanation:An atom’s chemical behaviour is determined mostly by its number of valence electrons. Option D is correct. The valence electrons, which are the electrons in the outermost shell of an atom, are the ones primarily involved in chemical reactions.
These electrons can be shared, lost, or gained in a chemical reaction, thereby determining the atom’s chemical behaviour. For example, Hydrogen has one valence electron, and it forms bonds with other atoms by sharing or losing that electron.
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In a combustion reaction, one of the reactants is _____. hydrogen a metal nitrogen oxygen
Answer:
oxygen
Explanation:
Always needed to combust
Sodium and chlorine react to form sodium chloride: 2na(s)+cl2(g)→2nacl(s)part awhat is the theoretical yield of sodium chloride for the reaction of 55.0 g na with 67.2 g cl2?
Answer:
The answer is 108 if you are coming from Mastering Chem
Explanation:
What would be the mass of an unknown liquid if 89.2 ml had a density of 75.2 g/ml?