Answer:
The presence of dust on the victim's right or left hand
Explanation:
The presence of powder, the route of the bullet, and the damage the bullet generates tells us what the caliber of the weapon was like, and type.
The presence of gunpowder in the hand is a consequence of the person being shot, usually in the victim's skilled hand.
The type of evidence might show striations that might lead to a specific weapon is Victim's bones.
What is the main reason cells are replaced in the body?
A The cells are too large.
B The cells are inactive.
C The cells are damaged.
D The cells are cancerous.
Answer:
The answer is C
Explanation:
Because when cells are damaged, your body will make new cells to get rid of damaged cells and if you don't, it can become cancerous. For example, if a damaged cell isn't removed, then it might reproduce agian and then you will have sickly cells or cancerous cells.
What makes the atomic radius change down a column of the periodic table?
O A. The greater number of total electrons, the larger the atomic radius.
O B. The more valence electrons listed, the larger the atomic radius.
C. The more sublevels occupied, the larger the atomic radius.
O D. The larger the highest energy level number, the larger the atomic
radius.
Answer:
As you go across a period, radius shrinks because you are adding protons. The added positive charge increases pull on the electron shells. So I believe the answer is D
The statement, that describes the atomic radius change down a column of the periodic table is "the larger the highest energy level number, the larger the atomic radius."
What is atomic radius?The size of an atom is described by its atomic radius. Atomic radius is commonly defined as the total distance from an atom's nucleus to the electron's outermost orbital.
The atomic radii of elements steadily grow from top to bottom in a group. As we move down the group, the atomic number rises, and so does the number of shells. Furthermore, as we advance down the group, the valence electrons are present in a higher shell, increasing the distance of the valence electrons from the nucleus. As a result, the attraction between the nucleus and the valence electron weakens. When a result, as one moves along a group, the atomic radius grows.
As the number of energy levels (n) decreases down a group, the distance between the nucleus and the outermost orbital rises. As a result, the atomic radius increases.
Hence, the correct option is D.
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Which of the following describes scientists?
A. People with similar personalities
B. People from different backgrounds
C. People with perfect understanding of science
D. People with only one perspective
Answer:C.people with perfect understanding of science.
Answer:
C. People with perfect understanding of science
Explanation:
Similar personalities, different backgrounds, and only one perspective are just traits of people.
Perfect understanding of science is relating to a scientist. Scientists have high knowledge of science.
compounds please determine the correct subscripts: OsaNb RhcCd The subscripts are a b c d
Answer:
Os(III)Nb(V) Rh(III)4 C5
Explanation: you need four Rh and five carbon its been a while since i've done it so i can't remember how to order the multiples of the number. hope this helps.
Answer ASAP
How do ethical concerns affect scientific research?
Answer:
Short answer is ethical concerns pose as limits.
Explanation:
As a scientist, one would want to research anything with limited possibilities. You would have to make sure however you're planning to test you hypothesis is safe for the environment (the people, the plants, the animals, and the earth in general)
Explain how it is possible to have a homogeneous mixture of two different compounds. Give an example.
Answer:
Take a look at explanation below.
Explanation:
Part 1 ) A homogeneous mixture of two different substances, by definition, is a solution. A homogeneous mixture itself is known to have same proportions of its components throughout any given sample. Thus it is possible to have two different compounds in this mixture, but still let it distribute among themselves evenly.
_______________________________________________________
Part 2 ) How is this possible? Take the simple example of " mixing salt with water. " This is a solution. The salt ( dissolved material ) is present in the same amount throughout the solution, as it evenly distributes itself.
A homogeneous mixture is formed when;
Two liquids are completely miscibleA solid dissolved completely in a liquidA homogeneous mixture is one in which there is no phase difference. A homogeneous mixture has a continuous uniform composition throughout the system.
For instance, water and ethanol are miscible in all proportions hence a mixture of the two is an example of a homogeneous mixture.
Also, when sugar is dissolved in water, the sugar completely disappears and become a continuous phase. The resulting solution is a homogeneous mixture.
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Which of the following is not a physical property of water? It is composed of hydrogen and oxygen. It has a boiling point of 100°C. It is a colorless liquid. Sugar dissolves in it.
Answer:
It is composed of hydrogen and oxygen.
Explanation:
Who re-introduces Democritus' theory of atoms back into modern science in the 1800's?
Answer:
John Dalton with his atomic theory reintrodcued the theroy of atoms
Explanation:
Around 450 B.C., the Greek philosopher Democritus introduced the idea of the atom. However, the idea was essentially forgotten for more than 2000 years. In 1800, John Dalton re-introduced the atom. He provided evidence for atoms and developed atomic theory
Explanation:
A glass of table wine contains:
5% alcohol
7% alcohol
12% alcohol
17% alcohol
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, a glass of table wine contains 12% alcohol in it.
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.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.
There are so many drinks in markets which differ in the percentage of alcohol present in them. A glass of table wine contains 12% alcohol in it.
Therefore, a glass of table wine contains 12% alcohol in it.
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Which of the following would have the best thermal conductor properties?
A. A thick mug
B. A plastic cup
Ос. A paper cup
D. A cup made of metal
Answer:
D
Explanation:
metal is a major cunductor of heat
A cup made of metal would have the best thermal conductor properties.
The answer is option D.
Is a metal cup a good conductor of heat?Metals have unfastened electrons that are not bounded to the atoms. those electrons are unfastened to move around within the metal, colliding with the metal atoms and shifting heat to them successfully. This makes metals higher conductors of warmth than maximum other materials.
Which of the following would have a high-quality thermal conductor?Diamond is the leading thermally conductive material and has conductivity values measured 5x better than copper, the maximum synthetic metallic inside the united states of America. Diamond atoms are composed of a simple carbon spine this is a really perfect molecular structure for an effective heat switch.
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What is a scientific method? A. A method of testing an idea B. The steps required to form a hypothesis C. A way of analyzing data D. The process of proving a theory
Answer:
A. A method of testing an idea
Explanation:
The steps of the scientific process involve formulating a hypothesis, testing it, analysing the data, making conclusions, and reporting the findings.
What type of bond is formed between hydrogen and nitrogen in ammonia (NH3)? A. polar covalent B. ionic C. nonpolar covalent D. metallic
Answer:
A. Polar covalent
Explanation:
The polarity of a bond depends on the electronegativity difference (ΔEN) between the bonded atoms.
If the electronegativity difference between the atoms is between 0.4 and 1.7, the bond is polar covalent.
For an N-H bond, ΔEN = |3.04-2.20| = 0.84
So, the bond is polar covalent.
B is wrong. A bond is ionic only if ΔEN > 1.6.
C is wrong. A bond is nonpolar only if ΔEN < 0.4.
D is wrong. N and H are not metals.
What significant contribution did Lavoisier make to chemistry?
A. He was the first to use scientific experiments to learn about
atoms.
B. He was the first to discover the atom.
C. He was the first to propose the atomic theory.
D. He was the first to split the atom.
A significant contribution that Lavoisier made to chemistry is that he was the first to propose the atomic theory that is in Option C, the atomic theory was critical for understanding and studying atoms.
What is the significance of the Lavoisier?His contribution is significant because he made significant contributions to the fields of chemistry and biology, such as the discovery of oxygen, and also gave the concept of conservation of mass of the atoms, which is why he is known as the "Father of Modern Chemistry," as well as he is well known for his experimentation and precise measurement.
Hence, a significant contribution that Lavoisier made to chemistry is that he was the first to propose the atomic theory that is in Option C, the atomic theory was critical for understanding and studying atoms.
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Which of the following is a non electrolyte?
A. Cas
B. NH4OH
C. Na2CO3
D. LISO4
E. CH3CH2CH2OH
Answer:
I do not know
Explanation:
b may be I think
How does cutting a substance make it dissolve faster? increases the surface area makes the particles move faster increases the amount of solute
Answer:
Increases the surface area.
Explanation:
Cutting a substance into smaller parts is simply increasing the surface area of the substance.
An increase in surface area will increase the reaction rate because a larger part of the substance gets to interact with the right orientation bringing about the reaction in a much faster rate.
This is also true about dissolving substance.
If the substance to be dissolved is cut into smaller parts, the surface area of the substance is increased and the dissolution of the substance will be fast because a larger part of the substance gets to interact will the solvent quickly bringing about a fast dissolution.
Which describes a climate effect on the rate of weathering? Cold climates favor mechanical weathering. Chemical reactions occur slower at higher temperatures. Lower precipitation levels lead to more chemical reactions. The chemical reaction rates of minerals are not impacted by temperature.
Answer:
the answer is Cold climates favor mechanical weathering.
Explanation:
I got 100% on the Quiz
Statement that describes climate effect on the rate of weathering as regards this question is A:Cold climates favor mechanical weathering.
Weathering can be regarded as disaggregation of rocks into smaller bits by the actions of agents of weathering such as man, animals, water and so on.However, climate can also have effect on the rate of weathering, when there is cold climate, mechanical weathering is favoured.Option B,C,D are wrong because high temperature brings about increase in rate of chemical weathering.
Therefore, option A is correct.
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Peas contain 250 kJ per 100 g. You would use the equivalent of 600 g of peas if you slept for .
Answer: 7,793 hours.
Explanation:
Let's assume you are about 150 pounds. You would use only 414 calories a night (1.7 kJ). If 250 kJ is 100 g, then 1500 kj is 600 g. So we would need 360000 calories to be eaten. You would have to sleep for about 7,793 hours.
Light shining on a strip of metal can dislodge electrons. Do you think this is more consistent with light being made up of waves or of particles?
waves
particles
not sure
Answer:
The correct answer to the following question will be "Particles".
Explanation:
A particle seems to be a little component of something, it's little. When you're talking about a subatomic particle, that would be a structured user likely won't see because it's quite unbelievably thin, but it has a tiny mass as well as structural integrity. Such particles seem to be tinier than that of the particles or atoms.Such that the light which shines on the bit of metal could dissipate electrons, the particles seem to be more compatible with the light.Answer:
particles
Explanation:
on edge
Why does reducing solute particle size increase the speed at which the solute dissolves in water? A. It exposes more of the solute to the water molecules. B. It makes the temperature of the water significantly higher. C. It raises the pressure of the water molecules on the solute. D. It makes the water molecules move around faster.
Answer:
A.
Explanation:
A. It exposes more of the solute to the water molecules.
A compound with a molar mass of about 28 g/mol contains 85.7% carbon and 14.3% hydrogen by mass. Write the Lewis structure for a molecule of the compound.
Answer:
See below.
Explanation:
Take a look at the attachment( s ) below. One has an explanation, the other has the lewis dot structure solution;
The compound with molar mass 28 g/mol has been ethylene, with the molecular formula [tex]\rm \bold{C_2H_4}[/tex].
The Lewis structure has been the structure of the molecule consisting of the number of bonds present in the compound. The given compound has been 100% weight/weight.
The percent of carbon = 85.7%
The percent of hydrogen = 14.3%
The compound has molecular mass = 28 g/mol
Since, the given percent of hydrogen and carbon has been weight %. The mass of hydrogen and carbon has been:
Mass of carbon = 85.7 g
Mass of hydrogen = 14.3 g
The moles of hydrogen and carbon in the compound has been:
[tex]\rm Moles\;=\;\dfrac{Mass}{Molecular\;mass}[/tex]
Moles of carbon can be given as:
[tex]\rm Moles\;of\;carbon\;=\;\dfrac{85.7\;g}{12.01\;g/mol}[/tex]
Moles of carbon = 7.13 mol
Moles of hydrogen can be given as:
[tex]\rm Moles\;of\;hydrogen\;=\;\dfrac{14.3\;g}{1.008\;g/mol}[/tex]
Moles of hydrogen = 14.19 mol
In the given molecular compound, the number of atoms of hydrogen and carbon has been calculated with respect to carbon moles, to give the empirical formula of the compound.
The atoms of carbon has been:
[tex]\rm Carbon\;=\;\dfrac{7.13}{7.13}[/tex]
Carbon = 1
The atoms of hydrogen has been:
[tex]\rm Hydrogen\;=\;\dfrac{14.19}{7.13}[/tex]
Hydrogen = 2
The empirical formula of compound has been [tex]\rm \bold{CH_2}[/tex].
The compound has molar mass 28 g/mol.
The mass of [tex]\rm \bold{CH_2}[/tex] = 14 g/mol
The number of empirical formula unit has been given as:
[tex]\rm Number\;of\;empirical\;formula\;unit\;=\;\dfrac{14}{28}[/tex]
Number of empirical formula unit = 2
Thus the molecular formula of the compound has been [tex]\rm \bold{C_2H_4}[/tex]. The attached image has been the structure of ethylene.
The compound with molar mass 28 g/mol has been ethylene, with the molecular formula [tex]\rm \bold{C_2H_4}[/tex].
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What is the latent heat of vaporization?
A. The energy required to break molecular bonds
B. The energy required to go from a liquid to a gas
C. The energy required to go from a solid to a liquid
D. The energy required to go from a solid to a gas
B
The arrangement of a substance's molecules changes when it changes phases, but its temperature remains constant. The substance absorbs thermal energy from its surroundings to undergo a phase shift if the new arrangement has a larger thermal energy content. The substance releases thermal energy onto its surroundings if the new arrangement contains less thermal energy.
A substance's physical characteristic is its latent heat of vaporization. Its definition is the amount of heat needed to transform a single mole of liquid at its boiling point at mean atmospheric pressure. It is stated in terms of kg/mol or kJ/kg. The energy causes a liquid substance to transition from a liquid form to a vaporous one.
Which of the following is an accurate description of an ionic bond? Anions and anions attract. Cations and cations attract. Cations and anions attract. Atoms share electrons.
Answer:
Atoms of different elements, having gained or lost electrons, form negative and positive ions that are bonded together by attractive forces between ions with opposite charges.
Explanation:
The atoms have different numbers of neutrons and the same number of protons. hope this helps you :)
Which of the following can be mixed in solution with NH2 to make a buffer?
A. NH4Cl
B. NaOH
C. HNO3
D. NaCl
Answer:
B
Explanation:
okjsksjsjsjsjsjdjdjdjfjdmr. f send fifnf8t for
Answer:
The answer is option A
NH4Cl
Hope this helps.
ASAP
Why do elements within a period of the periodic table have different
properties?
A. They have different arrangements of core electrons.
B. They have different numbers of valence electrons.
C. Some are metals and some are nonmetals.
D. They have different combinations of protons and neutrons.
Answer:
It’s b
Explanation:
(Apex)
They have different numbers of valence electrons. Hence, option B is correct.
What are elements?Elements are the simplest substances which cannot be broken down using chemical methods.
Elements within the same period have different numbers of electrons in their valence shells from left to right and different electron configurations. Thus, all elements in the same period are chemically different from each other.
Hence, option B is correct.
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What does it mean for heat to be transferred by convection?
O A. Energy is transferred through moving currents of warmer air or
liquid.
O B. Energy is transferred through converting bond energy to kinetic
energy
C. Energy is transferred when molecules absorb electromagnetic
wees
O D. Energy is transferred when one molecule collides with another
Answer:
A
Explanation:
It seems most appropriate since it's the transfer of heat in fluids including air
Heat is meant to be transferred by convection as energy is transferred through moving currents of warmer air or liquid which is in option a as it involves the transfer of thermal energy through the movement of a fluid.
In convection process, the warmer regions of the fluid or liquid become less dense, which is causing them to rise. As the warmer fluid rises, it carries thermal energy with it as its properties change. while, the cooler regions of the fluid became denser, and that led to sink. This creates a continuous circulation of the fluid, which helps to distribute the heat in the area.
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Why might the increase of noise in natural areas be a problem, according to scientists studying wildlife? Support your answer with at least two details from the text.
Answer:
The increase of noise in the wild zones affects the life of the individuals, promoting their extension, their alteration and diminishing their quality of life, this is also known as noise pollution
Explanation:
Some ecologists maintain that it is essential for the life of the wild animal that there is no disturbance of human contamination, since in this way the animals will be even more stressed and will affect both their feeding and reproduction and even the possible immunology of the animals. animals.
The contaminations are several, one of them is known as sound pollution, which refers to how humans intervene with sound and contaminate natural areas.
Most gases ______________ .
A.are dense
B.Have a definite volume
C.Have a definite shape
D.are compressible
The picture represents ____________.
A.Mixture of Elements and Compounds
B.Elements
C.Mixture of Elements
D.Mixture of Compounds
E.Compounds
which of the following accurately describes the transmission of sound and waves in seawater? A sound travels faster in seawater because seawater is less compressible than the atmosphere. B sound travels slower in seawater because seawater is less dense than the atmosphere C sound travels slower in seawater because seawater is colder than the atmosphere D sound travels faster in seawater because seawater is less dense than the atmosphere.
Answer:
Salty water is more dens than freshwater. answer is D
Explanation:
The statement which accurately describes the transmission of sound and waves in seawater that sound travels faster in seawater because seawater is more dense than the atmosphere.
What is sound waves?Sound wave is an example of longitudinal wave. It always travel through any medium as it requires some objects to transfer its energy.
Travelling of sound waves is directly depends on the vibration of the particles of the medium and in seawater particles of the water in the form of salt are present in much amount which makes it dense. And due to dense medium sound waves will travel through seawater through the fast speed.
Hence, sound travels faster in seawater because seawater is more dense than the atmosphere.
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Atoms are very small. Approximately how many atoms would it take to
make a stack as thick as a potato chip?
A. Thousands
B. Hundreds
C. Billions
D. Millions
Reset Selection
Answer:
Billions
Explanation:
A full stop contains almost trillion of atoms.
Billions of atoms would it take to make a stack as thick as a potato chip. Hence, option C is correct.
What are atoms?An atom consists of a central nucleus that is usually surrounded by one or more electrons.
Billions of atoms would it take to make a stack as thick as a potato chip. Hence, option C is correct.
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