It is the first one that's correct...
Science is characterized by asking questions about the natural world. It involves a methodical process of observation, hypothesizing, experimentation and conclusion. Science does not use opinions to make conclusions but relies on systematic observation, experimentation and testing to ascertain facts.
Explanation:A characteristic of science is that it asks questions about the natural world. This process is often initiated by observation, leading scientists to generate questions they wish to answer. Science employs systematic methods for observing the universe, forming theories and testing hypotheses to understand how the world operates.
In essence, science seeks to discover and describe the underlying order within nature. It's through the rigorous processes of observation, hypothesis formulation, experimentation, and conclusion that science separates facts from opinion, aiming to describe the universe accurately as it is and not as imagined or wished.
This investigative approach isn't conducted by single individuals; it's a collaborative endeavor involving many scientists. Most importantly, science does not use opinions to draw conclusions. Rather, it bases conclusions on evidence and facts gathered systematically through experiments, observations, and testing.
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During an experiment, 102 grams of calcium carbonate react with an excess amount of hydrochloric acid. If the percent yield of the reaction was 85.15%, what was the amount of calcium chloride formed?
Answer:
96.31 g.
Explanation:
From the balanced reaction:CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O,
1.0 mole of CaCO₃ reacts with 2.0 moles of HCl to produce 1.0 mole of CaCl₂, 1.0 mole of CO₂, and 1.0 mole of H₂O.
We need to calculate the no. of moles of (104 g) of CaCO₃:no. of moles of CaCO₃ = mass/molar mass = (102 g)/(100.08 g/mol) = 1.019 mol.
Using cross multiplication:
1.0 mole of CaCO₃ produce → 1.0 mole of CaCl₂.
∴ 1.019 mole of CaCO₃ produce → 1.019 mole of CaCl₂.
∴ The amount of CaCl₂ produced = no. of moles x molar mass = (1.019 mol)(110.98 g/mol) = 113.1 g.
∵ percent yield of the reaction = [(actual yield)/(theoretical yield)] x 100.
Percent yield of the reaction = 85.15%, theoretical yield = 113.1 g.
∴ actual yield = [(percent yield of the reaction)(theoretical yield)]/100 = [(85.15%)(113.1 g)] / 100 = 96.31 g.
Answer:
96.3
Explanation:
took test
Please can any one help me by answering this question!!+ignore my answer!,
I have posted the answetr in this picture.
Baseball player throws a baseball ball travels 35 m in five seconds what is the average speed of the ball
Answer:
7
Explanation:
divide 35 by 5 and you get 7
or do inverse operation 7 x 5 = 35
Answer:
[tex]\boxed{\text{7 m/s}}[/tex]
Explanation:
The formula for average speed is
[tex]\text{speed} = \dfrac{\text{distance}}{\text{time}}\\\\s = \dfrac{d}{t}[/tex]
Data:
d = 35 m
t = 5 s
Calculation:
[tex]s = \dfrac{\text{35 m}}{\text{5 s}} = \text{7 m/s}[/tex]
The average speed of the ball is [tex]\boxed{\textbf{7 m/s}}[/tex]
Question 1 of 10
2 Points
A species has homologous chromosomes. What does this say about the
species?
O
A. It has alleles that control certain traits.
O
B. It has pairs of matching chromosomes.
O
C. It is a eukaryote and a haploid species.
O
D. It has DNA that is made up of genes.
Answer: The answer is (B).
Explanation:
Answer (A) is too broad because all chromosomes have alleles that control certain traits. This doesn't tell us anything about the species indicated in the question.
Answer (B) is the correct answer because homologous chromosomes can pair up during meiosis while heterogenous chromosomes cannot.
Answer (C) is incorrect because most species of animals and plants are diploids, meaning their chromosomes come in matching sets called homologous pairs.
Answer (D) is too broad because all chromosomes have DNA that is made up of genes. This doesn't tell us anything about the species indicated in the question.
Consider this equilibrium for a buffer solution: CH3COOH + H2O CH3COO- + H3O + . When a small amount of acid is added to this system, which statement is true when equilibrium is reestablished? A. [CH3COO-] and pH have both increased. B. [CH3COOH] and pH have both decreased. C. [CH3COO-] has decreased and pH remains relatively constant. D. [CH3COOH] has decreased and pH remains relatively constant. E. [CH3COO-] has increased and pH remains relatively constant.
Answer:
e
Explanation:
This equilibrium for a buffer solution: CH3COOH + H2O CH3COO- + H3O + When a small amount of acid is added to this system,
E. [CH3COO-] has increased and pH remains relatively constant.
What kind of buffer would be a mixture of CH3COOH and CH3COONa?acidic buffer
A mixture of a weak acid and its salt with a strong base serves as an acidic buffer. The reaction shows that some acetic acids react with the OH– from the base and converts it to water.
Which of the following is not a buffer solution CH3COOH CH3COONa?HCl and NaCl. Buffer is an equimolar mixture of weak acid and salt with a strong base.
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PLEASE HELP!!
The table shows the mass and boiling point of some substances.
( I attached a picture of the table )
Part 1: Is the value of M less than, greater than, or equal to the value of N?
Part 2: Explain your answer for Part 1.
Answer: the boiling point of a substance dosent bater how muc hof there it is if there is 100 gallons of water it still boils at 100 c jus takes longer due to more space but if you do 1 gallon it is also 100 c but is faster due to less space to heat up
Part 1:
It appears from the question that M refers to the boiling point of water when the mass is 2, and N refers to the boiling point of Soybean Oil also at a mass of 2. Without the exact figures for M and N given in the question, one can deduce that if both substances have the same mass, N, the boiling point of soybean oil, is greater than M, the boiling point of water. This is because water's boiling point is known to be 100 °C, which is significantly lower than that of soybean oil.
Part 2:
The boiling points of substances heavily depend upon intermolecular forces. Water has a high boiling point relative to its molar mass because of the strong hydrogen bonds between water molecules. However, soybean oil, which consists of long-chain hydrocarbons, likely has different intermolecular forces, such as London dispersion forces, which are stronger due to the larger molar mass and lead to an even higher boiling point.
Therefore, based on our understanding of intermolecular forces and the given information that soybean oil has a boiling point of 300 °C, we can confirm that N is greater than M.
CAN SOMEONE REWRITE/SHORTEN THIS FOR ME PLEASE? I'LL GIVE BRAINLIEST
Genetically modified organisms/ GMOs can be defined as organisms in which the genetic material (DNA) has been altered in a way that does not occur naturally by mating and/or natural recombination. The technology is often called “modern biotechnology” or “gene technology”, sometimes also “recombinant DNA technology” or “genetic engineering”. It allows selected individual genes to be transferred from one organism into another, also between nonrelated species. Foods produced from or using GM organisms are often referred to as GM foods.
GM foods are developed and marketed because there is some advantage either to the producer or consumer of these GM foods. This is meant to translate into a product with a lower price, greater benefit ,or both. GM seed developers wanted their products to be accepted by producers and have concentrated on innovations that bring direct benefit to farmers and generally the food industry.
One objective for developing plants based on GM organisms is to improve crop protection. The GM crops currently on the market are mainly aimed at an increased level of crop protection through the introduction of resistance against plant diseases caused by insects or viruses or through increased tolerance towards herbicides.
Resistance against insects is achieved by incorporating into the food plant the gene for toxin production from the bacterium Bacillus thuringiensis. This toxin is currently used as a conventional insecticide in agriculture and is safe for human consumption. GM crops that inherently produce this toxin have been shown to require lower quantities of insecticides in specific situations, where pest pressure is high. Virus resistance is achieved through the introduction of a gene from certain viruses which cause diseases in plants. Virus resistance makes plants less susceptible to diseases caused by such viruses, resulting in higher crop yields.
Answer:
Here you go! 50% of your writing piece
Explanation:
Foods produced from or using GM organisms are often referred to as GM foods.
GM foods are developed and marketed because there is some advantage either to the producer or consumer of these GM foods. GM seed developers wanted their products to be accepted by producers and have concentrated on innovations that bring direct benefit to farmers and generally the food industry.
One objective for developing plants based on GM organisms is to improve crop protection. The GM crops currently on the market are mainly aimed at an increased level of crop protection through the introduction of resistance against plant diseases caused by insects or viruses or through increased tolerance towards herbicides.
Resistance against insects is achieved by incorporating into the food plant the gene for toxin production from the bacterium Bacillus thuringiensis. GM crops that inherently produce this toxin have been shown to require lower quantities of insecticides in specific situations, where pest pressure is high.
GMOs are organisms with artificially altered DNA through genetic engineering, used in agriculture, medicine, and conservation. They offer benefits like improved crops and medicinal advances but are also subject to regulatory scrutiny and public debate over safety and environmental impact.
Genetically Modified Organisms (GMOs)
Genetically modified organisms (GMOs) are those whose genetic material has been altered in ways that do not occur naturally. This process, also known as genetic engineering or recombinant DNA technology, enables the introduction of new traits to an organism. For example, genes conferring pest resistance or tolerance to herbicides can be transferred from one organism to another, even between nonrelated species. This technology has applications in agriculture for crop protection, enhancing nutritional content, and improving food production efficiency. Additionally, GMOs have promising applications in environmental conservation, medicine production, and may even address issues like plastic pollution.
However, GMOs are subject to intense debate regarding consumer safety, environmental impact, and ethical concerns. Despite their benefits, such as reduced pesticide use and increased yields, concerns about potential ecological effects, unintended health consequences, and gene transfer to non-target species lead to strict regulation and public caution. Yet, after comprehensive research, GMOs have been deemed safe for consumption.
Which structural feature will differ among an ester, an alcohol, and an aldehyde, regardless of which examples are being compared?
the functional group
the branching pattern of the carbon chain
the number of carbon atoms
Answer:
The functional group
Explanation:
A functional group defines a hydrocarbon. an ester the functional group is an O- alkyl group while that one of an alcohol is -OH group. An aldehyde is a functional group on its own.
Answer: the functional group
Explanation:
Functional groups are specific group of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules.
1. Esters have functional group [tex]-O=C-OR[/tex].
Example: methyl ethanoate with molecular formula [tex]CH_3COOCH_3[/tex]
2. Alcohols have functional group [tex]-OH[/tex].
Example: Propanol with molecular formula [tex]CH_3CH_2CH_2OH[/tex]
3. Aledydes have functional group [tex]-O=CH[/tex].
Example: propanal with molecular formula [tex]CH_3CH_2CHO[/tex]
Thus esters , alcohols and aldehydes may have same number of carbon atoms and similar branching pattern but different functional groups.
In the equation below, suppose 11 grams of zinc react with 12 grams of hydrogen chloride to form 16 grams of zinc chloride and an unknown amount of hydrogen gas.
Zn + 2HCl → ZnCl2 + H2
Based on the Law of Conservation of Mass, how many grams of hydrogen gas will form?
A:1 gram
B:7 grams
C:19 grams
For apex The answer is b
In the equation Zn + 2HCl → ZnCl₂ + H₂, suppose 11 grams of zinc react with 12 grams of hydrogen chloride to form 16 grams of zinc chloride and an unknown amount of hydrogen gas. 7 grams of hydrogen gas will form. Therefore, option B is correct.
What is zinc ?With the atomic number 30 and the symbol Zn, zinc is a chemical element. When the oxidation is removed, zinc transforms into a shiny-greyish metal that is slightly brittle at normal temperature. It is the first element in the periodic table's group 12
Oysters are the best source of zinc, but it is also abundant in red meat and fowl. Beans, almonds, crab, lobster, whole grains, breakfast cereals, and dairy products are additional excellent sources.
A non-metal hydrogen is displaced by a metal zinc in a single displacement reaction. As a reductant metal, zinc (Zn) dispenses hydrogen (H₂) from an aqueous solution of HCl to produce zinc chloride (ZnCl2) and hydrogen gas (H₂).
Thus, 7 grams of hydrogen gas will form, option B is correct.
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Which of these are components of DNA? Check all that apply.
deoxyribose sugar molecules
ribose sugar molecules
adenine
phosphate molecules
uracil
cytosine
thymine
Answer:
deoxyribose sugar molecules.adenine.cytosine.thymine.phosphate molecules.Explanation:
Hope it helps.
Final answer:
The components of DNA include deoxyribose sugar molecules, adenine, phosphate molecules, cytosine, and thymine. Ribose sugar molecules and uracil are components of RNA, not DNA. DNA is constructed from nucleotides, which are the building blocks containing these components.
Explanation:
Components of DNA
DNA, or deoxyribonucleic acid, is composed of three types of molecules: deoxyribose sugar molecules, phosphate molecules, and nitrogenous bases. The nitrogenous bases in DNA are adenine, cytosine, guanine, and thymine. Therefore, the components of DNA that apply from your list are deoxyribose sugar molecules, adenine, phosphate molecules, cytosine, and thymine.
Ribose sugar molecules and uracil are not components of DNA; they are present in RNA (ribonucleic acid), which is another type of nucleic acid involved in protein synthesis and gene expression. DNA utilizes thymine as a base instead of uracil, and the sugar present in DNA is deoxyribose, which differs from ribose by lacking an oxygen atom on the second carbon.
The essential building blocks of DNA are the nucleotides, which consist of a deoxyribose sugar, a phosphate group, and one of the four nitrogenous bases (adenine, guanine, cytosine, and thymine). These nucleotides come together to form the double-helical structure of DNA, which is critical for its functions in storing and transmitting genetic information.
How do greenhouse gases in the atmosphere affect Earth’s temperature?
this is for my written response
Answer: The greenhouse gases cause Earth's surface to heat up from the sunlight.
Explanation: The greenhouse gases causes the Earth's surface to warm up in the morning and at night, the surface cools down. When it cools down, that gives the heat a chance to get back into the air, but some of the heat is trapped (which is caused by the greenhouse gases). That's why, on average, Earth stays at 58 degrees Fahrenheit.
Which is most likely to be the energy source for organisms living in hydrothermal vents?
A: oxygen
B: sunlight
C: methane
D: carbon dioxide
Methane because I just know and it is very hard to explain
The organisms living in the hydrothermal vent are provided by the energy with methane. Thus, option C is correct.
What are hydrothermal vents?Hydrothermal vents are the fissures near the volcanos in the seafloor that supports the ecosystem deep inside the sea.
The animals near the hydrothermal vents are octopus, crabs, zoarcid fishes, etc. The living of the organism in the cold water in the vent is supported by the absence of sunlight. The carbon compound act as the energy source at the hydrothermal vent.
Thus, the organisms in the hydrothermal vent are supported with energy by methane molecules. Hence, option C is correct.
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Write 40% as a fraction in simplest form.
Answer:
2/5
Explanation:
Make 40% to 40/100 simplify by dividing by 10 to 4/10 then simplify again by dividing by 2 to make 2/5
Using stoichiometry, determine the mass of powdered drink mix needed to make a 1.0 M solution of 100 mL from C12H22O11
Answer:
[tex]\boxed{\text{3.4 g}}[/tex]
Explanation:
Step 1. Calculate the moles of C₁₂H₂₂O₁₁
[tex]\text{n = 0.100 L} \times \dfrac{\text{1.0 mol}}{\text{1 L}}=\text{0.100 mol}[/tex]
Step 2. Calculate the mass of C₁₂H₂₂O₁₁
[tex]\text{m = 0.100 mol} \times \dfrac{\text{342.30 g}}{\text{1 mol}} = \text{3.4 g}\\\\\text{The mass of sucrose needed is }\boxed{\textbf{3.4 g}}[/tex]
Final answer:
To make a 100 mL of 1.0 M solution of C12H22O11, we need 34.23 grams of powdered drink mix, by first calculating the moles required (0.1 moles) and then using the molar mass (342.30 g/mol) to find the required mass.
Explanation:
To calculate the mass of powdered drink mix needed to make a 1.0 M solution of 100 mL using C12H22O11, we need to use stoichiometry. First, we should calculate the number of moles of C12H22O11 required for a 1.0 M solution. Since molarity is moles of solute per liter of solution, for 0.1 liters (100 mL) of a 1.0 M solution, 0.1 moles of solute is needed.
Next, we find the molar mass of C12H22O11, which is the sum of the atomic masses of each element multiplied by the number of each atom in the molecule:
12 carbon atoms (12 x 12.01 g/mol)22 hydrogen atoms (22 x 1.008 g/mol)11 oxygen atoms (11 x 16.00 g/mol)The molar mass for C12H22O11 will be approximately 342.30 g/mol. The mass of the powdered drink mix needed is calculated as mass = moles × molar mass, which is 0.1 moles × 342.30 g/mol, equaling 34.23 grams. Therefore, we need 34.23 grams of C12H22O11 to make a 100 mL of 1.0 M solution.
How might gull populations be affected
Answer:
Herring might be eaten by anothe kind of fish that gulls eat.
A 1.50-liter sample of dry air in a cylinder exerts a pressure of 3.0 atmospheres at a temperature of 25°C. Without change in temperature, a piston is moved in the cylinder until the pressure in the cylinder is reduced to 1.0 atmosphere. What is the volume of the gas? (Be sure to use the correct number of significant figures.) 0.22 L 0.50 L 2.0 L 4.5 L
Answer:
4.5L
Explanation:
Given parameters:
Inital volume, V₁ of the dry air = 1.50L
Initial pressure P₁ = 3.0atm
Temperature = 25°C
Final pressure P₂ = 1.0atm
Final volume of gas, V₂ = ?
To solve gas related problem, we apply Boyle's law based on the parameters given.
Boyle's law states that the volume of a fixed mass of gas is inversely proportional to the pressure provided that temperature is constant.
The law is simply expressed as:
P₁V₁ = P₂V₂
From the parameters given, the unknown V₂ which is the final volume.
Making V₂ the subject of the equation gives:
V₂ = [tex]\frac{P_{1} V_{1} }{P_{2} }[/tex]
V₂ = [tex]\frac{3x1.5}{1}[/tex] = 4.5L
Convert to standard notation.
1.312 x 10^2
Answer: The answer would be 131.2
Explanation: How I got my answer is quite simple. In order for it to turn into standard notation, it would need to be turned into the answer of an equation. The equation here would be "1.312 x 10^2". 10^2 would be 100. Multiply 100 by 1.312 will make the decimal point move 2 times to the right, so it will end up in front of the 2. That would make the answer 131.2
I hope this info helps! :P
How can you tell for sure that a redox reaction has happened?
Answer:
Determine the value of the oxidation numbers of atoms or ions on the reactant side and the product side.
Explanation:
A redox reaction involves some ions, and atoms losing electrons and other gaining them in the same reaction. When oxidation occurs, there is loss of electrons by an element thus its oxidation number increases; becomes more positive. When reduction occurs an element gains electrons and the oxidation number becomes more negative; reduces.
If an element (s) behaves in this manner in the whole reaction, then be sure to deduce that a redox reaction has occurred.
Answer:
If oxidation state changes, it is a redox reaction
Explanation:
the mass of 2.50 moles of calcium fluoride (CaF2) is how many grams ?
Answer:
195.199grams
Explanation:
Fluorine has a molar mass of 18.99984 while calcium has a molar mass of calcium is 40.08.
1 mole of calcium fluoride has a mass of 40.08+2×18.99984
=78.0797 grams
if one mole has a mass of 78.0797 grams, then 2.5 moles have:
2.5 moles× 78.0797 grams/mole= 195.1992 grams
Answer:
195
Explanation:
First, calculate the molar mass of CaF2:
Ca: 1 × 40.078 g/mol = 40.078 g/mol
F: 2 × 18.998 g/mol = 37.996 g/mol
40.078 g/mol + 37.996 g/mol = 78.074 g/mol CaF2
Then, convert moles to grams by multiplying the number of moles by the molar mass:
2.50 mol CaF2 × 78.074 g/mol CaF2 = 195 g CaF2
How many molecules are present in 385.55g of NO2?
Final answer:
There are approximately 5.045 x 10^24 molecules in 385.55g of NO2. This is calculated by first determining the number of moles in the given mass using its molar mass and then multiplying by Avogadro's number.
Explanation:
To calculate the number of molecules in 385.55g of NO2, we first need to determine the number of moles of NO2 in the given mass. The molar mass of nitrogen dioxide, NO2, is calculated as follows:
M(NO2) = 14 +(2)(16) = 46 g/mol
Then, we use the molar mass to convert grams to moles:
Number of moles of NO2 = mass (g) / molar mass (g/mol)
= 385.55g / 46 g/mol
= 8.381 mol of NO2
Afterward, we use Avogadro's number, which is 6.022 x 1023 molecules per mole, to find the total number of molecules:
Number of molecules = Number of moles × Avogadro's number
= 8.381 mol × 6.022 x 1023 molecules/mol
≈ 5.045 x 1024 molecules of NO2
what is the frequency of a wave where 3 wavelenths pass 1 second
Answer:
3 Hz
The frequency is three waves per second, or 3 Hz.
If gas is initially at 350L and 500k then changes to 295K what is the new volume
The answer is:
The new volume is equal to 206.5 L.
Why?To solve this problem, we need to assume that the pressure is constant, and use the Charle's Law equation, so, solving we have:
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
We are given:
[tex]V_1=350L\\T_1=500K\\T_2=295K[/tex]
Then, using the Charle's Law equation, we have:
[tex]\frac{350L}{500K}=\frac{V_2}{295K}[/tex]
[tex]\frac{350L}{500K}=\frac{V_2}{295K}\\\\V_2=\frac{350L}{500K}*295K=206.5L[/tex]
Hence, we have that the new volume is equal to 206.5 L.
Have a nice day!
3AI²O³
What is the name of the element
Answer:
3 Aluminum Oxide
Explanation:
It is not an element but a coumpound.
Al is Aluminum
O is oxygen.
What are some safety precautions that must be taken in order for nuclear reactions to occur? Give at least 5 precautions
Answer:
1. Control of Radioactivity
This requires being able to control the neutron flux. Recall that in a nuclear reactor when a neutron is captured by a fuel nucleus (generally uranium) the nucleus splits releasing radioactive particles (or undergoes fission). Hence if we decrease the neutron flux we decrease the radioactivity. The most common way to reduce the neutron flux is include neutron-absorbing control rods. These control rods can be partially inserted into the reactor core to reduce the reactions. The control rods are very important because the reaction could run out of control if fission events are extremely frequent. In modern nuclear power plants, the insertion of all the control rods into the reactor core occurs in a few seconds, thus halting the nuclear reaction as rapidly as possible. In addition, most reactors are designed so that beyond optimal level, as the temperature increases the efficiency of reactions decreases, hence fewer neutrons are able to cause fission and the reactor slows down automatically.
2. Maintenance of Core Cooling
In any nuclear reactor some sort of cooling is necessary. Generally nuclear reactors use water as a coolant. However some reactors which cannot use water use sodium or sodium salts.
3. Maintenance of barriers that prevent the release of radiation
There is a series of physical barriers between the radioactive core and the environment. For instance at the Darling Nuclear Generation Station in Canada the reactors are enclosed in heavily reinforced concrete which is 1.8m thick. Workers are shielded from radiation via interior concrete walls. A vacuum building is connected to the reactor buildings by a pressure relief duct. The vacuum building is a 71m high concrete structure and is kept at negative atmospheric pressure. This means that if any radiation were to leak from the reactor it would be sucked into the vacuum building and therefore prevented from being released into the environment.
The design of the reactor also includes multiple back-up components, independent systems (two or more systems performing the same function in parallel), monitoring of instrumentation and the prevention of a failure of one type of equipment affecting any other.
Further, regulation requires that a core-meltdown incident must be confined only to the plant itself without the need to evacuate nearby residence.
Safety is also important for the workers of nuclear power plants. Radiation doses are controlled via the following procedures,
The handling of equipment via remote in the core of the reactor
Physical shielding
Limit on the time a worker spends in areas with significant radiation levels
Monitoring of individual doses and of the work environment
What is the clockwise torque on the following lever? 5.0 Nm 125 Nm 250 Nm 0.0 Nm
Answer:
The correct answer is B: 125 Nm
Explanation:
If an applied force causes rotation from upward to downward direction than the torque is clockwise and is called as negative clockwise torque. Minus sign represents the direction of the torque. SI unit of torque is Nm.
Given data:
Force = 25 N
r = 5.0 m
Formula:
Torque = r x F
= 5.0 m X 25 N
= 125 Nm
The clockwise torque is 125 Nm ( i.e -125 Nm. Here minus sign suggests that the torque is clockwise)
Answer:
125 Nm
Explanation:
What is the clockwise torque on the following lever?
5.0 Nm
125 Nm
250 Nm
0.0 Nm
If the amount of dark matter and energy is above the critical level, what will happen to the fate of the universe?
The universe will expand at an accelerated rate.
The expansion of the universe will stop, and its volume will remain the same.
The universe will stop expanding and collapse in a big crunch.
The expansion of the universe will slow but continue.
Answer:
I believe it is; The universe will stop expanding and collapse in a big crunch.
I may be wrong though so double check on that.
Explanation:
Answer:
The universe will stop expanding and collapse in a big crunch.
Explanation:
what is the total number of moles present in a 526.0-gram sample of NaNCO3(s)?
Answer:
6.26 mol.
Explanation:
We have the relation:no. of moles (n) = mass/molar mass.
mass of NaHCO₃ = 526.0 g, Molar mass of NaHCO₃ = 84.007 g/mol
∴ no. of moles (n) of NaHCO₃ = mass/molar mass = (526.0 g)/(84.007 g/mol) = 6.26 mol.
Many chefs today are taught using a culinary arts book written in 1903. True False
Many chefs today are taught using a culinary arts book written in 1903.
This Is "TRUE"
True penn foster student also a job corps student ik cause my teacher told me this
Explanation:
Which of the following statements is not true?
A.) Noble gases are very reactive chemicals.
B.) Noble gases also are called inert gases.
C.) Noble gases are found in group 18.
D.) Noble gases possess a full valence shell
Answer:
D
Explanation:
hope this helps
Answer:
A
Explanation:
Noble gases have a full valence shell, so D is correct.
Inert gases are another term for noble gases, so B is correct.
Noble gases are found in the last column, which is group 18. This makes C correct.
The last one is A, so that must be the one that is incorrect.
I hope this helped and please mark me as brainliest!
Need help ASAP plzzz
Answer: A
Explanation: Chemical changes don't change the mass. I also know that D in certainly incorrect