Answer:
Demonstrate familiarity with the pH scale ... body (excluding things like stomach acid) measure around 7.2 and 7.6 on the pH scale (a 7 is neutral on the scale). ... The pH of a solution is a measure of its acidity or alkalinity (base). ... Using a pH meter, you find the pH of an unknown solution to be 8.0.
Explanation:
Answer:
7 is neutral, acids are 1-6, bases are 8-14. Pure water has a pH of 7, where as almost everything else is either an acid or a base.
Methanol, CH3OH, is the simplest of the alcohols. It is synthesized by the reaction of hydrogen and carbon monoxide. Write chemical reactions. If 500 mol of CO and 750 mol of H2 are present, which is the limiting reactant?
Answer:
The limiting reactant is H₂
Explanation:
The reaction of hydrogen (H₂) and carbon monoxide (CO) to produce methanol (CH₃OH) is the following:
2H₂(g) + CO(g) → CH₃OH(g)
From the balanced chemical equation, we can see that 1 mol of CO reacts wIth 2 moles of H₂. So, the stoichiometric ratio is:
2 mol H₂/1 mol CO = 2.0
We have 500 mol of CO and 750 mol of H₂, so we calculate the ratio to establish a comparison:
750 mol H₂/500 mol CO = 1.5
Since 2.0 > 1.5, we have fewer moles of H₂ than are needed to completely react with 500 moles of CO. In fact, we need 1000 moles of H₂ and we have 750 moles. So, the limiting reactant is H₂.
If two moles of chlorine gas reacts with potassium iodine, how many grams of potassium chloride are produced?
A solution has a volume if 259 mL and contains 0.70 mol MaCl. What is its molarity
Answer:
2.8 m
Explanation:
:)
Which of following is true of liquids?
Group of answer choices
The particles move at a high rate of speed
The particles have a medium amount of kinetic energy and slide past one another.
The particles vibrate in place.
The particles have a fixed volume and shape
Answer:
The particles have a medium amount of kinetic energy and slide past one another
Explanation:
If particles move at a high rate of speed its gas, and if they vibrate in place and they have a fixed volume and shape its probably a solid. So a medium amount of kinetic enery is correct.
What is the correct answer based on sig figs for the following 4.2787 x 2.27= 9.712649
A. 9.712649
B. 9.7126
C. 9.7
D. 9.71
Answer:
a that all you need and why you just and use a calculators and what they are for
3. How does genetic variation allow humans to survive long-term? Which
type of reproduction is responsible for genetic variation?
Answer:
more genetic variation within a population usually enables more phenotypic variation.
Explanation:
Because natural selection acts directly only on phenotypes, Some new alleles increase an organism's ability to survive and reproduce, which then ensures the survival of the allele in the population.
Genetic variation lets the organisms survive long term as it increases the phenotypic and the genotypic variation. Genetic variation is due to the type of reproduction that involves two parents.
What is genetic variation?Genetic variation is the modification of the original genome of the organism by genetic recombination and mutation that can be beneficial in the survival and the natural selection process.
Reproduction involving two parents of the same species allow genetic variation as the process of independent assortment and crossing over of the chromosomes inherited from both creates species with different traits and genotype.
Therefore, the reproduction involving two parents results in genetic variation.
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How many liters would 18.0 grams of water vapor occupy at 273 K and 1.00 atm?
Answer:
22.41 Liters
Explanation:
Using the general law equation;
PV= nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
According to the information provided in this question,
mass of water vapor = 18g
Molar mass of water (H2O) = 1(2) + 16 = 18g.
mole = mass/molar mass
- mole (n) = 18/18 = 1mol
V = ?
T = 273K
p = 1 atm
Using PV = nRT
V = nRT/P
V = 1 × 0.0821 × 273/1
V = 22.41 Liters
In general, the Hippocratic Oath requires physicians to do all of the following EXCEPT which action?
treat every ill patient
do no harm
help their patients as best they can
maintain the privacy of their patients
Answer:
Physicians do not have to treat every ill patient. However they must uphold their ethics (eg. do no harm, confidentiatlity, etc.).
Explanation:
Primary source:
Hippocratic Oath (translation since it's originally in Greek)
I swear by Apollo the physician, and Asclepius, and Hygieia and Panacea and all the gods and goddesses as my witnesses, that, according to my ability and judgement, I will keep this Oath and this contract:
To hold him who taught me this art equally dear to me as my parents, to be a partner in life with him, and to fulfill his needs when required; to look upon his offspring as equals to my own siblings, and to teach them this art, if they shall wish to learn it, without fee or contract; and that by the set rules, lectures, and every other mode of instruction, I will impart a knowledge of the art to my own sons, and those of my teachers, and to students bound by this contract and having sworn this Oath to the law of medicine, but to no others.
I will use those dietary regimens which will benefit my patients according to my greatest ability and judgement, and I will do no harm or injustice to them.
I will not give a lethal drug to anyone if I am asked, nor will I advise such a plan; and similarly I will not give a woman a pessary to cause an abortion.
In purity and according to divine law will I carry out my life and my art.
I will not use the knife, even upon those suffering from stones, but I will leave this to those who are trained in this craft.
Into whatever homes I go, I will enter them for the benefit of the sick, avoiding any voluntary act of impropriety or corruption, including the seduction of women or men, whether they are free men or slaves.
Whatever I see or hear in the lives of my patients, whether in connection with my professional practice or not, which ought not to be spoken of outside, I will keep secret, as considering all such things to be private.
So long as I maintain this Oath faithfully and without corruption, may it be granted to me to partake of life fully and the practice of my art, gaining the respect of all men for all time. However, should I transgress this Oath and violate it, may the opposite be my fate.
The slate tabletops in the schools science lab are made from rocks that were under very high temperature and pressure. In which category of rock can slate be placed?
A. Igneous
B. metamorphic
C. sedimentary
D. volcanic
Answer:
B. metamorphic
Explanation:
Rocks formed under high heat and pressure is essentially the definition of metamorphic rock :)
Explain the difference between a normal salt and an acid salt.
Answer:
The difference between normal salt and acid salt is that acid salt is basically made up of strong acid and also including a weak base. However normal salt is practically made up of strong base or even a weak acid and also a weak base. Acid salt or in a more logical term known as acidic salt ionises into a type of form of H + ions which is more than OH- ions, which is in a water solution. But even than normal salt ionises into a form of eqaul number of H+ ions and OH- ions in this so called water solution.
why is cardboard, paper, or ceramic a better choice for coffee mugs?
What is the oxidation number of nitrogen in pb (NO3)2
Answer:
The oxidation number of N in is +5
Explanation:
When coal is burned to produce electricity, the electrical energy produced is less than the
potential energy in the coal. Which best explains this observation?
A. As coal is heated, some of the molecules move so fast that they are destroyed.
B. Some of the energy in coal is destroyed by the intense heat required to release its potential
energy
C. Some of the potential energy in coal is converted into forms of energy other than electricity.
D. The amount of potential energy in fuels is overestimated.
Answer: it should be c or b
Explanation:
The statement that best explains this observation is that some of the energy in coal is destroyed by the intense heat required to release its potential energy. The correct option is B.
What is electricity?Electricity is light energy that is produced when charged atoms move through a closed wire made up of a substance. The motion of the charged particle produces electricity.
Here, when coal is burned to produce electricity it is less than potential energy because in making energy some amount of energy is lost in the form of heat and is released. The amount of electrical energy generated from burning coal is less than the coal's potential energy.
Thus, the correct option is B. Some energy in coal is destroyed by the intense heat required to release its potential energy.
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Large sharks eat many other marine life animals. The sharks and the animals they eat are all part of which level of organization? (Select all that apply.)
dividual organisms
Answer:
the answer is ecosystem i believe.
Answer:
ecosystem
Explanation:
How many Na atoms are shown in the products?
Answer: 6.02214179×1023 atoms
Explanation: I think so
Scientists are now able to use the genetic code of organisms to find out more about their evolutionary history. How is this most likely to impact classification
The group of choices associated with the given question are as follows:
Organisms once thought to be unrelated may be found to be related.
Mode of nutrition of some organisms may change.
Organisms that do not have a backbone may develop one.
All multicellular organisms may be found to be prokaryotes
Answer:
The correct answer would be - Organisms once thought to be unrelated may be found to be related
Explanation:
Classification of the organisms is based on the shared characteristics and structural or environmental similarities of the organisms which are modified and evolved during the period of time. It is also known as life sciences evolve and genetic code provides more accurate information.
These evolutionary changes and will lead to certain organisms that are once thought to be unrelated organisms that may actually be related based on a genetic code. These codes have every small and accurate change that occurs and can also find out when these changes occured.
what are the oxides of oxygen
Answer:
Oxides are chemical compounds with one or more oxygen atoms combined with another element (e.g. Li2O). Oxides are binary compounds of oxygen with another element, e.g., CO2, SO2, CaO, CO, ZnO, BaO2, H2O, etc. These are termed as oxides because here, oxygen is in combination with only one element.
Explanation:
Answer:
Oxides are chemical compounds with one or more oxygen atoms combined with another element (e.g. Li2O). Oxides are binary compounds of oxygen with another element, e.g., CO2, SO2, CaO, CO, ZnO, BaO2, H2O, etc. These are termed oxides because here, oxygen is in combination with only one element.
help!!!!please i need to get this done before 3pm!today
Which one would it be since covalent bond is not here :( please help meeee
write the balance equation of ammonium sulfide + aluminum chloride
Answer:
3(NH4)2S + 2AlCl3 → 6NH4Cl + Al2S3
Explanation:
Firstly, ammonium sulfide has a chemical formula of (NH4)2S while aluminum chloride has a chemical formula of AlCl3. These two chemical substances react as follows:
(NH4)2S + AlCl3 → NH4Cl + Al2S3
This chemical equation is however, unbalanced. To balance the chemical equation, one has to ensure that the atoms of each element on both the reactant and product side equates with one another.
If we carefully observe each atom on both the reactants and product side, we will have the following balanced equation:
3(NH4)2S + 2AlCl3 → 6NH4Cl + Al2S3
That is;
- 6 moles of N and Cl on both sides
- 24 moles of H on both sides
- 3 moles of S on both sides
- 2 moles of Al on both sides
CHEM help
i know how to report random answers btw
Answer:
ionic, they would make an ion
Explanation:
YOU ARE AMAZING AND YOU ARE SO IMPORTANT HAVE A GOOD DAY!
Answer:
Thx Have a fantastic day! :)
Explanation:
Jason took 6 hours to travel 540 km. For the first 140 km, he took 2 hours.
What was his average speed during the first two hours? ___ km/h
How much distance did he cover in the last four hours of his journey? ___ km
What was his average speed for the rest of the journey? ___ km/h
Answer: Average speed for the first two hours was 70 km/hr
Covered 400 km in the last four hours
Average speed for the rest of the journey was 100 km/hr
Explanation: 140 km / 2 hours = 70 km/hr
540 km - 140 km = 400 km remaining for the last four hours
400 km / 4 hours = 100 km/hr for the last four hours
Which type of galaxy contains mostly new stars because it has lots
of dust and gas
Consider the following equilibrium reaction having gaseous reactants and products.
4HCl + O2 ⇌ 2H2O + Cl2
Which of the following would result from increasing the concentration of H2O?(4 points)
A. The rate of the backward reaction increases.
B. The concentration of hydrochloric acid decreases.
C. The rate of forward reaction increases.
D. The concentration of chlorine increases.
Answer:
A. The rate of the backward reaction increases.
Explanation:
The stress caused by increasing the H2O concentration would shift the system to the left, producing more reactants to counter the stress of added H2O. This means the rate of the backward reaction would increase.
Answer:
A
Explanation:
just took the test
HELP PLEASE Which type of power generation can produce carbon dioxide? solar hydroelectric coal wind
Answer:
COAL
Explanation:
Answer:
Coal!
Explanation:
Hope this helps!
Living things respire to stay alive. In the mitochondria, sugar is combined with oxygen to produce energy, water and carbon dioxide. Write the equation of this chemical reaction
Answer:
C6H12O6 + 6O2 → 6CO2 + 6H2O
Explanation:
Cellular respiration occurs in the mitochondria of cells. It is a process in which sugar is combined with oxygen to produce energy, water and carbon dioxide. This is the major process by which energy is released in living organisms.
Aerobic respiration involves a series of chemical reactions. These reactions commence with sugar and oxygen then it produces carbon dioxide and water according to the reaction equation; C6H12O6 + 6O2 → 6CO2 + 6H2O.
Answer: The equation for this Chemical reaction is:
C6H12O6 (s) + 6 O2 (g) → 6 CO2 (g) + 6 H2O (l) + heat (energy)
Explanation:
Mitochondria is the site of chemical energy conversions for cell activities. In the mitochondria, sugar (chemical energy) is combined with oxygen to produce energy, water and carbon dioxide. The equation for this reaction is already given above.
All living cells need energy for the metabolic processes essential for life. They get this energy from the chemical energy stored in food (sugar).
In this process, oxygen is necessary for the chemical energy in sugar to be converted to carbondioxide, water and release of heat energy. It is therefore an oxidative reaction.
Furthermore, energy is not released in one big step as shown in the above reaction, but in a series of small steps which are catalysed by enzymes. The energy that is released, bit by bit, is stored in adenosine triphosphate (ATP) molecules. The oxidation of glucose to release energy in this manner is known as CELLULAR RESPIRATION. It occurs also in the mitochondria of all living cells.
OMG PLEASE HELPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP MEEEEEEEEEEEEEEEEEEEEEEEEEE
6. Besides hydrogen and the polyatomic ion ammonium, what type of element forms cations: metal, metalloid, non-metal?
Answer: Metals
Explanation:
When an atom accepts an electron negative charge is created on atom and is called as anion.
When atom loses an electron positive charge is created on atom and is called as cation.
The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Thus metals form cations.
Can someone help pls! I’m very confused on this!!
