26.7% is the percent composition by mass of sulfur in a compound named magnesium sulfate. Explanation: Molar mass of compound = 120 g/mol.
During an investigation, hair samples are taken from either the head or pubic area of a victim.
A. True
B. False
Answer:
A. True
Explanation:
it is possible to identify a hair as originating from a particular body area, the regions of the body that are primarily used in forensic comparisons are the head and pubic areas.
Forensic = the application of scientific methods and techniques to natters investigation by a court of law.
During an investigation, hair samples are taken from either the head or pubic area of a victim. This statement is true.
What is investigation ?A thorough search for facts, particularly those that are obscure or need to be sorted out in a complicated situation, is known as an investigation. An investigation's main objective is often to ascertain how or why something occurred. Investigations are frequently formal, official processes.
Establishing pertinent data to support or refute claims of fraud and corruption is the goal of an inquiry.
It takes subjective thought to develop justifiable justifications for beliefs. It is conceivably the most significant line of thought an investigator will follow. It is a way of thinking that is founded on the facts, information, and evidence the investigator has gathered throughout their inquiry.
Thus, During an investigation, hair samples are taken from either the head or pubic area of a victim.
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Which statement best describes how a compound is different from an element?
Answer:
An element is a substance that cannot be chemically decomposed into simpler substances. An atom is the smallest particle of an element that can take part in chemical reactions. A compound is a substance formed from two or more elements chemically joined (bonded) together.
Explanation:
I WILL GIVE BRAINLEST PLS HELP
Phosphorus forms many oxoacids. Indicate the oxidation number of phosphorus in each of the following acids:
(a) HPO3, (b) H3PO2, (c) H3PO3, (d) H3PO4, (e) H4P2O7, (f) H5P3O10.
Answer:I need it
Explanation: I have the same quision in my chemistry exam but i dont have the answer
giving brainliest
Construct a balanced symbol equation for the formation of methane from carbon and
hydrogen. (1 mark)
Answer:
reference attached
Explanation:
hope it helps you<3Minerals are all naturally occurring solid substances with a definable chemical composition. They must also possess Group of answer choices the ability to be synthesized in the laboratory as well as be found in nature. metallic elements, such as iron, calcium, or magnesium. metallic luster. a fixed crystalline structure (spatial arrangement of atoms and ions).
They must also possess a fixed crystalline structure (spatial arrangement of atoms and ions).
Structure of mineralsMinerals are those naturally occurring substances that are required for proper growth of living organisms.
It is found both on earth and in food substances such as calcium, magnesium, iron.
Minerals are known to have spatial arrangement of atoms and ions. Which means the ions and atoms are not randomly arranged.
Therefore, minerals are all naturally occurring solid substances with a definable chemical composition because it possess a fixed crystalline structure.
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If I have 8.5 moles of gas at a temperature of 83 °C, and a volume of 100.0 liters, what is the pressure of the gas?
Answer:
1.18 atm
Explanation:
We need to use the Ideal Gal Law for this question:
PV = nRT, where P is the pressure, V the volume, n the moles, R the gas constant, and T the temperature in Kelvins.
I'll choose a gas constant that has units compatible with the given conditions:
R = 0.08206 (L*atm)/(K*mol)
P = (8.5 moles)*(0.08206 (L*atm)/(K*mol))*(365.1K)
Make sure all the units cancel except atmospheres.
P = 1.18 atm
Fill the chart below (23.46.haploid,diploid,gametes, body cells, reproduction, growth/healing”
Answer:
A. Gametes are formed by meiosis and are haploid, while body cells are formed by mitosis and are diploid.
Explanation:
Meiosis is a type of cell division that produces four haploid daughter cells (gametes) from one cell, while mitosis produces two diploid daughter cells (i.e., somatic cells). In both cases, the DNA is replicated during interphase of the cell cycle
Is my answer correct?
Answer:
I don't think your answer is correct, It's B
Explanation:
1. What type of circuit is in the diagram?
parallel circuit
series circuit
Answer:
A series circuit is defined as the circuit in which a number of resistances are connected one after the other.. In a series circuit, the flow of current follows a single path.
A parallel circuit is defined as the circuit in which a number of resistances are linked across each other in such a way that one terminal of each resistance is connected to form a junction point while the remaining end is also connected to form another point.
You havent added the diagram so i cant tell you the answer, but i added the definition of each circuit, see if that helps!
determine the cation of each?
HURRY!!!
Answer:
Potassium (K)
Strontium (Sr)
Magnesium (Mg)
Explanation:
The cation in Potassium Chloride (KCl) is Potassium (K) because of Potassium’s placement on the periodic table it has a charge of +1 while Chlorine has a charge of -1, making it the anion with a 1:1 ratio.
The cation in Strontium Chloride (SrCl2) is Stronitum (Sr) because of Strontium’s placement on the periodic table it has a charge of +2 while Chlorine has a charge of -1, making it the anion but since there are two Chlorines present in the formula, a 1:2 ratio.
The cation in Magnesium Chloride (MgCl2) is Magnesium (Mg) because of Magnesium’s placement on the periodic table it has a charge of +2 while Chlorine has a charge of -1, making it the anion but since there are two Chlorines present in the formula, a 1:2 ratio.
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After performing an experiment in the lab, Michelle finds that she has produced 15.6 g of compound. She calculated that the theoretical yield of her reaction was 17 g. What percent yield did Michelle achieve?
a) 109%
b) 91.8%
c) 8.2%
d) 0.918%
Answer:
b
Explanation:
percentage yield = mass of what is produced ÷ theoretical yield x 100
percentage yield = 15.6÷17=0.9176470588235
x 100 = 91.76
this rounds to 91.8%, so the answer is b. :)
A covalent molecule Q contains exactly 6 shared electrons. What is Q
Answer:
oxygen has six shared electrons
Covalent molecules are the group of atoms that shares a covalent bond. Ammonia is a molecule that shares three pairs or six electrons to form a covalent bond.
What are covalent bonds?Covalent bonds are the intermolecular bonds that mutually involve the sharing of electrons between the two or more atoms of the molecules. In ammonia three pairs of electrons are in a covalent bond.
In an ammonia molecule nitrogen have five electrons in its outer shells and hydrogen have one electron each. When three hydrogen shares their electrons with nitrogen to make a covalent bond the octet of the nitrogen atom is completed.
Therefore, covalent molecule Q is ammonia.
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What are examples of repurposing land as part of land reclamation? Select the two correct answers.(1 point)
reintroducing wildlife to the ecosystem
building a golf course and golf club
restoring a local waterway
creating a community garden
planting trees to replace what was removed
Answer:
Building a Golf Course and golf club & Creating a Community Garden
Explanation:
I just took a Quick check with this Question and I got if Right! Hope this helped!
The examples of repurposing land as part of land reclamation are Building a Golf Course and golf club and the act of Creating a Community Garden.
Land reclamation is known to be the method that is often used in the making or creation of new land by the act of increasing the elevation of a waterbed or low-lying land.
This can be done also by pumping water out of muddy morass areas. Land reclamation is said to be gotten by increasing the level of a seabed or riverbed.
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2 KCIO3 → 2 KCl + 3 02
If 195 grams of Potassium Chlorate (FM = 122.55 grams) decomposes, how much Oxygen (FM =
32.00 grams) will be produced in this reaction?
The amount of oxygen that would be produced will be 76.38 grams
Stoichiometric calculationFrom the equation of the reaction, the mole ratio of KCIO3 to O2 is 2:3. That is, for every one mole of KCIO3 that decomposes, 1.5 moles of oxygen is produced.
Mole of 195 grams KCIO3 = 195/122.55
= 1.59 moles
Equivalent mole of O2 = 1.59 x 3/2
= 2.39 moles
Mass of 2.39 moles oxygen = 2.39 x 32
= 76.38 grams
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how much oxygen is typically required to complete a combustion reaction
A.Triple to Quadruple the amount listed
B. Same as the amount listed
C. Ten times amount listed
D. Double or triple the amount listed
Answer:
Mass of oxygen required = 19.5 moles × 16 g/mol = 312 g.
Explanation:
SOMEONE HELP ME PLEASE
Convert the answer from above to Kelvin
Answer:
313.15K
Explanation:
According to the Celsius to Kelvin formula, by adding 273.15, the temperature in Celsius can be converted to the temperature in Kelvin. Thus, 0°C = 0 + 273.15 = 273.15 K.
so to convert 40°c to kelvin
40+273.15
= 313.15K
In the Rutherford nuclear-atom model, ________.
A)the heavy subatomic particles, protons and neutrons, reside in the nucleus
B)the three principal subatomic particles (protons, neutrons, and electrons) all have essentially the same mass
C)the light subatomic particles, protons and neutrons, reside in the nucleus
D)mass is spread essentially uniformly throughout the atom
Which material would result in the greatest amount of energy transfer?
An absorber that is dark in color and rough.
A reflector that is dark in color and smooth.
An absorber that is light in color and rough.
A reflector that is light in color and smooth.
The material which would result in the greatest amount of energy transfer is a reflector that is light in color and smooth.
What is Energy transfer?This is the process by which energy is relocated from one system to another through methods such as conduction, radiation etc.
Energy is easily radiated from a light in color and smooth material as a result of its high reflective capacity which is why option D was chosen.
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Answer:
d
Explanation:
The characteristic which distinguishes a true solid from other phases of matter at STP is that in a true solid the particles are 1 vibrating and changing their relative positions by vibrating without changing their relative positions 2 3 motionless but changing their relative positions 4 motionless without changing their relative positions.
Answer:
Background
Solids – relatively rigid, definite volume and shape. In a solid, the atoms and molecules are attached to each other. ...
Liquids – definite volume but able to change shape by flowing. In a liquid, the atoms and molecules are loosely bonded. ...
Gases – no definite volume or shape
PLEASE HELP!!!!!!!!!!!
Heat change
Q1 = 27 x 4.184 x (314-273)=4631.688 J
n H₂O = 27 g : 18 g/mol = 1.5 moles
Q2 = 1.5 x 40.7 = 61.05 J
Q3 = 27 x 2.093 x (273-263)=565.11 J
Q4 = 4631.688 + 61.05 + 565.11 = 4987.848 J
Imagine the movement of gas particles in a closed container. According to the kinetic molecular theory, which statements below are true of the gas particles? Check all that apply. Gas particles act like tiny, solid spheres. Gas particles are in constant, random motion. Gas particles at lower temperatures move faster. Collisions are elastic, there is no energy lost as the particle hits the sides of the container. Slower moving particles collide more often and with more force with the container.
Answer:
The answers are:
1. Gas particles act like tiny, solid spheres.
2. Gas particles are in constant, random motion.
4. Collisions are elastic, there is no energy lost as the particle hits the sides of the container.
Hope this helps!
According to the Kinetic Molecular Theory, the statements that are true of the gas particles are:
Gas particles act like tiny, solid spheres.Gas particles are in constant, random motion.Collisions are elastic, there is no energy lost as the particle hits the sides of the container.What is the Kinetic Molecular Theory?The Kinetic Molecular Theory actually states that the particles of gas are in motion constantly and their collisions are perfectly elastic.
This theory is actually used to give explanations for Boyle's and Charles' laws.
According to the Kinetic Molecular Theory, the collisions of the gas are elastic and are in constant motion.
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what three factors determine if something is pollutant?
Answer:
They include: Chemical nature of the pollutant - how active and toxic it is to humans, plants and animals; Concentration - the amount of the chemical per unit volume of air, water, soil, and; Persistence or longevity - how long the pollutant remains in the environment in its harmful form.
Explanation:
Air pollutants like ozone, particulate matter, carbon monoxide, nitrogen oxide, sulfur dioxide, lead cause atmospheric pollution which regards to ozone depletion, GH effect, climate change and human health effects. If anyone say the main factors of air pollution beyond of industry, means of transportation, solid waste generation and urbanization.
Growing urbanization and industrialization grows more pollution. Due to a large number of population in the world, more pollution is generated. Specifically if we talk about air pollution, due to steady increase in number of industries, the gradient level is deteriorating day by day. There is no good if we just talk about sustainable development if we are not following it.
Answer:
Explanation:
Chemical nature of the pollutant ConcentrationPersistenceWhat is the atomic number and mass number of calcium ?
Answer:
Calcium has an Atomic number of 20 and Atomic mass of 40.078 u
Hope this helps!
1. Describe the process of gene splicing.
2. What are the functions of a restriction enzyme and ligase?
Answer:
The DNA is cut using special chemicals called restriction enzymes,.
DNA ligase are used to insert genes and other pieces of DNA into plasmids.
An angle grinder is best suited for use with which material?.
What is the iupac name of the oxyacid formed from chlorite?.
The IUPAC name of the oxyacid formed from chlorite is chlorous acid.
All oxyacids have the acidic hydrogen bound to an oxygen atom, so bond strength (length) is not a factor, as it is with binary nonmetal hydrides. Rather, the electronegativity of the central atom and the number of oxygen atoms determine oxyacid acidity. For oxyacids with the same central atom, acid strength increases with the number of oxygen atoms attached to it. With the same number of oxygen atoms attached to it, acid strength increases with increasing electronegativity of the central atom.
Compared to the salts of their deprotonated forms (a class of compounds known as the oxyanions), oxyacids are generally less stable, and many of them only exist formally as hypothetical species, or only exist in solution and cannot be isolated in pure form.
Thus, the IUPAC name of the oxyacid formed from chlorite is chlorous acid.
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Living things need to reproduce in order to propagate the species and survive. Males and females are set up in such a way that reproduction is possible, but sometimes humans do not have the ability to reproduce. Science has advanced technologies tremendously for the past few decades that artificial reproduction is now an option.
For this performance task, research and define the 4 Artificial Reproductive Technologies. After gathering information, reflect on the following questions. Write your answers based on your research on a separate sheet of paper.
a. What are the ethical implications of these technologies?
b. Should humans be allowed the ability to artificially reproduce? What is your opinion on this and why?
c. Should these technologies not exist, what would be the impact on others should one person not be able to reproduce?
Artificial reproduction technologies enables individuals unable to conceive to be able to conceive and give birth.
Although ethical issues are raised, artificial reproduction technologies are important for people who cannot naturally conceive if the technology is used within the allowed ethics.
What are artificial reproduction technologies?Artificial reproduction technologies refers to the technologies available which enables individuals unable to conceive to be able to conceive and give birth.
Some artificial reproduction technologies includes;
in vitro fertilization (IVF)gamete intrafallopian transfer (GIFT)pronuclear stage tubal transfer (PROST)tubal embryo transfer (TET)zygote intrafallopian transfer (ZIFT).The ethical implications is that humans now can choose between which babies to be born and which are not, thereby playing God.
Though, many ethical issues arise, humans should be allowed to use this technologies in order to help those who are unable to give birth to be able to do so.
Without these technologies, it would be impossible for people who can not give birth to do so, which could cause a lot of mental and physical anxiety.
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Yeast contribute to beer brewing by producing ________ during alcohol fermentation. ethanol ethanol methanol methanol oxygen
Yeast is a substance which contributes to beer brewing by producing ethanol during alcohol fermentation.
What is Fermentation?This a process in which carbohydrate is converted into an acid or alcohol. A common fungus used by brewing companies in fermentation processes is referred to as Yeast.
It converts Sugar to the following products:
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Kayla is examining different soil samples and making notes about how well each sample sticks together. She has two soils that she has classified as dry, ones as wet and one as cemented. Which soil property is she examining?
a. consistency
b. density
c. structure
d. texture
a. consistency because she's making notes about how well each sample sticks together.
Answer:
A. consistency
Explanation:
I took the test
PLZ HELP ON THESE QUESTIONSSS
Answer:
wat
Explanation: