Reactivity is a chemical property, energy transferring between products and reactants is true of a chemical reaction, melting a substance and metal denting are physical changes, while digesting a sandwich is a chemical change.
Explanation:The chemical property of a substance from the given options is reactivity. A chemical property is related to how a substance interacts with other substances, and reactivity is an example of this.
For a chemical reaction, it's accurate to say that energy is transferred between products and reactants. During a chemical reaction, energy can either be absorbed or released, indicating a transfer of energy.
An example of a physical change from your list would be melting a substance. Physical changes involve a change in the physical properties of a substance, like its state of matter, but the substance itself doesn't change.
A chemical change involves a substance changing into a new substance with different properties. In this case, digesting a sandwich is a chemical change because it causes the food to break down into different substances.
Finally, from your list, an example of a physical change would again be metal denting. A physical change alters a substance without changing its composition, like denting a metal object does.
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Select the correct answer.
A weather station predicts that warm, humid air will pass over much cooler land during the early morning hours. Which precaution should the weather station give to residents who are driving to work that morning?
A.
Bring extra water because the morning will be hot and dry.
B.
Use headlights and drive slowly if you encounter dense fog.
C.
Pack raincoats and umbrellas to prepare for severe rainstorms.
D.
Plan for blizzard-like conditions by wearing snow boots and mittens.
it would be B because warm humid air+cool land=fog
Answer: B) Use headlights and drive slowly if you encounter dense fog.
Explanation: Fog begins to form when water vapor condenses into liquid water droplets that are suspended in the air. This happens when the air has a lot of moisture and when the temperature is low (because in this way the water in the air condenses). So if a weather station predicts that warm humid air will pass over much cooler land, the precaution must be to use healights and drive slowly because it will probably be dense fog.
Why do elements such as Neptunium, Plutonium, Californium, Einstenium, Bohrium, Flerovium, Radon, Oganesson, and a few others have half a number in parentheses at the bottom of their box on the periodic table instead of the atomic weight? Thanks! :)
All the elements you listed share a common trait: they are synthetic, radioactive elements. These elements do not have a stable isotope, so for a radioactive element, its most stable isotope's atomic mass will be listed in parentheses.
One such example would be plutonium. This element has 6 different isotopes with differing half-lives. The most stable isotope for plutonium is plutonium-244, with a half-life of around 80 million years. Therefore, the atomic mass listed for plutonium will be (244).
Which equation obeys the law of conservation of mass?
A.
2Fe + 3O2 → 2Fe2O3
B.
4Fe + O2 → 2Fe2O3
C.
Fe + O2 → Fe2O2
D.
4Fe + 3O2 → 2Fe2O3
2.1 x10^3 + 2.1 x 10^2
Which of the following is a reasonable ground-state electron configuration?
1s21p62d2
1s22s42p6
1s22s22p5
1s22s22d6
Answer is: 1s22s22p5.
1) Electron configuration 1s²1p⁶2d², this is not reasonable because 1p and 2d oritals do not exist.
2) Electron configuration 1s²2s⁴2p⁶, this is not reasonable because s orbitals only contain 2 electrons.
3) Electron configuration 1s²2s²2p⁵ is of an element fluorine. Fluorine (F) has atomic number 9, which means it has 9 protons and 9 electrons.
4) Electron configuration 1s²2s²2d⁶, this is not reasonable because 2d orbitals do not exist.
Hydrochloric acid, or HCl, reacts with solid NaOH
What are the products of this chemical reaction?
Answer:
NaCI and H20
To simplify it.
Answer:
The products are NaCl and H₂O
Explanation:
The complete question is:
"Hydrochloric acid, or HCl, reacts with solid NaOH. What are the products of this chemical reaction?
HCl and NaCl
NaCl and H2O
NaOH and HCl
NaOH and H2O"
Neutralization reactions are the reactions between an acid and a base, producing salt and water. It is the type of reaction that happens in this case.
An acid and a base are strong when fully ionized, that is, in the ionization process they completely transform into positive cations or ions and negative anions or ions. So, a strong acid is an acid that completely dissociates into hydrogen ions and anions in solution.
In this case, both the HCl acid and the NaOH base are strong, completely dissociating as follows:
HCl → H⁺ + Cl⁻
NaOH → Na⁺ + OH⁻
So you have:
H⁺ + Cl⁻ + Na⁺ + OH⁻ → ?
The hydroxide anions and the hydrogen cations will neutralize each other to produce water.
H⁺ + OH⁻ → H₂O
So the sodium Na anions and Cl cations will form the NaCl salt.
Finally, the balanced chemical equation is
HCl + NaOH → NaCl + H₂O
What is the charge of an ion that has 12 protons and 13 electrons
Is cooking raw tomatoes a physical or a chemical change?
Explain why?
When you are asked a question like this, you can always ask yourself this question. Can I change it back after this change? For example, if you are burning wood, you cannot bring it back to wood after you burn it, therefore, it is a chemical change. However, if you boil and evaporate water, you can make the water condense again back into its liquid form. In this case, you cannot bring the tomato back to its raw state. Therefore, cooking raw tomatoes is a chemical change.
what is the density of mass=40g volume=20mL
Answer: The density of a substance is 2 g/mL
Explanation:
To calculate the mass of solution, we use the equation:
[tex]\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}[/tex]
We are given:
Mass of a substance = 40 g
Volume of a substance = 20 mL
Putting values in above equation, we get:
[tex]\text{Density of a substance}=\frac{40g}{20mL}=2g/mL[/tex]
Hence, the density of a substance is 2 g/mL
The density of a substance that has a mass of 40g and a volume of 20mL is 2g/mL.
HOW TO CALCULATE DENSITY:
The density of a substance can be calculated by dividing the mass of the substance by its volume. That is;Density (g/mL) = mass(g) ÷ volume (mL)According to this question, the mass of substance is given as 40g and a volume of 20mL. The density is calculated as follows:Density = 40g ÷ 20mLDensity = 2g/mLTherefore, the density of a substance that has a mass of 40g and a volume of 20mL is 2g/mL.Learn more at: https://brainly.com/question/2040396?referrer=searchResults
If we removed the producers from this food web, how would it affect the balance of the ecosystem?
There would be a decrease in consumers and decomposers.
There would be an increase in primary consumers and a decrease in secondary consumers.
There would be a decrease in primary consumers and an increase in secondary consumers.
There would be an increase in consumers and decomposers.
There would be a decrease in consumers and decomposers.
Removing producers would slowly but surely cause the entire food web to tumble. With this in mind - we can say that the answer is A (There would be a decrease in consumers and decomposers) - because everything will lessen with the removal of producers.
Alkali metals are found in many common substances but are rarely found in pure form. Explain why this is in the case
Alkali metals are rarely found in pure form because they are so reactive.
Alkali metals are in Group 1 of the Periodic Table.
They need to lose only one valence electron to reach a filled valence shell
Thus, they readily react wirh water and other chemicals in the earth to form compounds.
Linda has two glasses of apple juice. Glass A has 40 grams of juice at 25 °C. Glass B has 40 grams of juice at 40 °C. Which of the following steps will make the kinetic energy of the molecules of the juice in both glasses equal?
In both glasses have juices of same mass. But the temperature is different due to which the kinetic energy of molecules in both glasses is different.
As kinetic energy is directly proportional to temperature.
To make the kinetic energy of the molecules equal she should:
Heat one glass of 25°C to 40°C.or
Cool the juice of 40°C to 25°CThe answer would be "C" increase glass a by 15 degrees
Which statements describe organic compounds? Check all that apply.
Organic compounds are commonly found in living things.
Organic compounds are not associated with or made from living things.
Organic compounds contain carbon.
Organic compounds usually lack carbon. Organic compounds are found in food.
Answer: The answers are A C E. I took the test.
Explanation:
Two cups of the same size are filled to the brim with clear liquids. Only one container holds water. The other contains a liquid that has greater density than water. How could you safely identify the container holding the water? A) See which cup feels heavier. B) Taste the liquid in both cups. C) Touch the liquid in both cups. D) Add salt to the liquids to see if it dissolves.
Answer: A) See which cup feels heavier.
Explanation:
Density is defined as the mass contained per unit volume.
[tex]density=\frac{mass}{volume}[/tex]
Thus if a liquid is more denser than water, it contains more mass per unit volume and thus feel heavier.
We cannot taste or touch liquids as the liquid can be corrosive.
Both the liquids can be polar and thus both can dissolve ionic compound i.e salt in it.
Thus the other liquid that has greater density than water feels heavier than water.
calculate molarity of 0.50 mol of LiNO3 in 6.50 L of solution
molarity (M) = mol / Liters
molarity = ?
mol of LiNO3 = 0.50 mol
Volume = 6.50 L
molarity = 0.50 mol / 6.50 L
molarity = 0.0769 mol/L
Hope this help!
Molarity is calculated by taking the ratio of no. of moles of solute to the volume of solution in liter. The molarity of the solution containing 0.50 mol of the solute in 6.50 L of solution is 0.07 M.
What is molarity?Molarity is a term used to represent the concertation of a solution. Mathematically it is the ratio of no. of moles of solute to the volume of solution in liters.
Given that the no. of moles of solute is 0.50 and the volume is 6.50 L. Molarity of this solution is calculated as follows;
Molarity = no.of moles/ volume in L
= 0.50 mol / 6.50 L
= 0.07 mol/L
Hence, molarity of the given solution is 0.07 molar.
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Pb + PbO2 + 2H2SO4 2PbSO4 + 2H2O How many moles of water are produced if 5.43 mol PbO2 are consumed?
5.43 times 2 = 10.86
10.9 is your answer.
Answer: 10.86 moles
Explanation: For the given chemical reaction. 2 moles of lead combines with 2 moles of lead oxide and 2 moles of sulphuric acid to produce 2 moles of lead sulphate and 2 moles of water.
[tex]Pb+PbO_2+2H_2SO_4\rightarrow 2PbSO_4+2H_2O [/tex]
1 mole of lead oxide [tex](PbO_2)[/tex] produces 2 moles of water[tex](H_2O)[/tex]
Thus 5.43 moles of lead oxide [tex](PbO_2)[/tex] produces =[tex]\frac{2}{1}\times 5.43=10.86[/tex] moles of water[tex](H_2O)[/tex]
what volume of silver metal Will Weigh exactly 2500 .0 g the density of silver is 10.5 g/ cm3 squared
Hello!
The formula is density = mass / volume
=> volume = mass / density
volume = ?
mass = 2500.0 g
density = 10.5 g/cm3
volume = mass / density
volume = 2500.0 g / 10.5 g/cm3
volume = 2380.95 cm3
Hope this help!
The volume of silver that weighs exactly 2500.0 g is approximately 238.095 cm³, if the density of silver as 10.5 g/cm³.
To find the volume of silver that weighs exactly 2500.0 g, we use the formula for density, which is:
Density = Mass / Volume
Given the density of silver as 10.5 g/cm³, we can rearrange the formula to solve for volume:
Volume = Mass / Density
Substituting the given values:
Volume = 2500.0 g / 10.5 g/cm³
Volume ≈ 238.095 cm³
This means that a volume of approximately 238.095 cm³ of silver will weigh 2500.0 g.
Which acid has the formula HNO2?
If it was HNO3 then it would be Nitric Acid (ic)
But it is HNO2 and that is Nitrous Acid (ous)
The less joiners is ''OUS''
The more joiners is ''IC'' .
Finally the answer is Nitrous acid.
Nitrous acid, with the formula HNO₂, is a weak acid significant in many chemical processes and cannot be isolated in pure form. It is used for the production of hydroxylamine, diazotizations, and the synthesis of various compounds such as azo dyes and drugs. Nitrous acid also forms specific coordination compounds with NO₂ acting as either a nitro or nitrito ligand.
The acid with the formula HNO₂ is known as nitrous acid. Nitrous acid is a weak acid with a pKa of 3.15 at 25°C and it cannot be isolated in pure form.
It primarily exists in aqueous solutions and is a significant reagent in various chemical processes including the production of hydroxylamine (NH₂OH), diazotization of aromatic amines, and the manufacture of azo dyes and drugs. Moreover, nitrous acid plays a role in the chemistry of coordination compounds, where NO₂ can act as a monodentate nitro (N-coordination) or nitrito (O-coordination) ligand.
Other oxoacids of nitrogen include nitric acid (HNO₃), which is also an essential acid in the chemical industry. Nitric acid is stronger than nitrous acid and is produced through the Ostwald process, which eventually oxidizes ammonia to NO₂, and subsequently to nitric acid.
A sample of gas has a mass of 827 mg . Its volume is 0.270 L at a temperature of 88 ∘ C and a pressure of 975 mmHg . Find its molar mass.
Steps:
Mw = w * R * T / p * V
T = 88 + 273 => 361 K
p = 975 mmHg in atm :
1 atm = 760 mmHg
975 mmg / 760 mmHg => 1.28 atm
Therefore:
= 0.827 * 0.0821 * 361 / 1.28 * 0.270
= 24.51 / 0.3456
molar mass = 70.92 g/mol
Answer:
The molar mass of the gas is 70.83 g/mol.
Explanation:
Mass of the gas m= 827 mg = 0.827 g
Molar mass of gas = M
Pressure of the gas = 975 mmHg = 1.28 atm
Temperature of the gas = 88^C= 361 K
Using idal gas equation:
[tex]PV=nRT[/tex]
[tex]PV=\frac{m}{M}\times RT[/tex]
[tex]M=\frac{mRT}{PV}[/tex]
[tex]M=\frac{0.827 g\times 0.0820 atm L/mol K\times 361 K}{1.28 atm \times 0.270 L}=70.83 g/mol[/tex]
The molar mass of the gas is 70.83 g/mol.
Which of these is a mixture carbon, carbon dioxide, air, and oxygen
Air is not a compound because oxygen and nitrogen stay seperately in air instead of reacting nitric oxide which is toxic. Same thing apply to other gases. Of course there are also few compound inside the air. However, air you breathe in generally is mixture made up of different non reacting gases and gas compounds.
mark brainliest plssss
Answer: Air is a mixture
Explanation:
Mixture is a substance which has two or more components which do not combine chemically and do not have any fixed ratio in which they are present. Example: Air
Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions.Example: Carbon [tex](C)[/tex] , Oxygen [tex](O)[/tex]
Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water [tex]CO_2[/tex]
Thus Air is a mixture as it is composed of various gases which are not chemically bonded.
PLLLLLSSS HELP!!!!!!!!!!!!!!!!!! What are the roles of the substances in the equation?
A- The substances 3CO2 and 4H2O are reactants that react to form the products C3H8 and 5O2.
B-The substances C3H8 and 3CO2 are reactants that react to form the products 5O2 and 4H2O.
C-The substances C3H8 and 5O2 are reactants that react to form the products 3CO2 and 4H2O.
D- The substances 5O2 and 3CO2 are reactants that react to form the products C3H8 and 4H2O.
The substances C3H8 and 5O2 are the reactants and 3CO2 and 4H2O are the products in the equation. These reactants combine to form the products in a process known as a chemical reaction, more specific, a combustion reaction.
Explanation:The correct answer is C: The substances C3H8 and 5O2 are reactants that react to form the products 3CO2 and 4H2O. In a chemical reaction, the reactants are the substances that start the process, and they are normally written on the left side of a chemical equation. The products are the substances that are produced, and they are usually written on the right side of the chemical equation.
For instance, in the chemical equation you've mentioned (C3H8 + 5O2 -> 3CO2 + 4H2O), the reactants - propane (C3H8) and oxygen (5O2) combine to form carbon dioxide (3CO2) and water (4H2O). Hence, the reactant side has C3H8 and 5O2, while the product side has 3CO2 and 4H2O. This reaction is an example of a combustion reaction.
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How many alcohols and ethers share the molecular formula c2h6o?
Answer is: there are two compounds with molecular formula C₂H₆O, one alcohol and one ethar.
Alcohol with molecular formula C₂H₆O is ethanol or ethyl alcohol (C₂H₅OH).
Ethanol is a volatile, flammable, colorless liquid with characteristic odor.
Ether with molecular formula C₂H₆O is dimethyl ether (CH₃OCH₃).
Dimethyl ether is a colorless gas.
Answer:
Alcohol :CH₃-CH₂-OH (ethanol)
Ether: H₃C-O-CH₃ (dimethyl ether)
Explanation:
Alcohols are compounds containing the hydroxyl or the -OH functional group i.e. R-OH where R is an alkyl or aryl group
Ethers are compounds with a general structure, R-O-R' where R and R' are once again either alkyl or aryl groups.
The given compound has a molecular formula: C₂H₆O
Structure with 'alcohol' -OH functional group
CH₃-CH₂-OH ------- ethanol
Structure with ether functionality:
H₃C-O-CH₃ ---------dimethyl ether
What is "change" when we are talking about natural and physical systems?
A.
Information that has been proven to be true
B.
Repeated processes that are used in a variety of ways
C.
A process for using knowledge and skills to acquire new knowledge
D.
A variable or alteration to one part that affects an entire system
D: is the anwser that your looking for
Answer:
A variable or alteration to one part that affects an entire system
Explanation:
Change in literal sense means the occurrence of some alteration or difference in a given object/situation/person etc.When we talk about physical and natural systems, then one can say that if a system shifts from one state to another then it has changed. The shift in the state means an alteration in its physical or chemical properties that occur in such a way that it causes a difference between the original state of the system to the final state. For example, if in a human body which is a natural system if the blood pressure drops then we can say that there is a change that took place.A copper coin with a mass of 6.30 grams changes temperature in the sunshine from 20.0°C to 32.0°C. How much energy is transferred? The specific heat capacity of copper is 0.377 joules/gram degree Celsius. Express your answer to three significant figures.
The energy transferred is 28.5 j
calculation
energy is calculate MCΔT formula where,
M(mass)= 6.30 grams
C(specific heat capacity)= 0.377 j/g
ΔT(change in temperature)= 32.0c- 20 c= 12 c
Energy is therefore= 6.30 g x 0.377 j/g /c x 12 c =28.5 j
The energy transferred is 28.5 j.
list two things that might spin a generator to produce electricity
electrical energy and mechanical energy
What is the chemical formila for monosaccharides?
Final answer:
The chemical formula for monosaccharides is CnH2nOn, where n can be any number greater than two. Glucose, a common monosaccharide, has a molecular formula of C6H12O6. Monosaccharides can exist as linear chains or as ring-shaped molecules, with glucose having two different arrangements of the hydroxyl group in its ring form.
Explanation:
The chemical formula for monosaccharides is CnH2nOn, where n can be any number greater than two. For example, glucose, a common monosaccharide, has a molecular formula of C6H12O6.
Monosaccharides can exist as linear chains or as ring-shaped molecules. In-ring forms, glucose can have two different arrangements of the hydroxyl group (OH) around the anomeric carbon. If the hydroxyl group is below carbon number 1 in the sugar, it is in the alpha (α) position, and if it is above the plane, it is in the beta (β) position.
The ring-forming reaction between the hydroxyl group and the carbonyl group occurs at carbon number 1, which is the anomeric carbon.
The development of the cell theory involved ___________________________. A. different ideas from different scientists. B. the efforts of one scientist. C. work with computer models. D. complete agreement among scientists. The invention of the microscope made it possible for scientists to _________ A. create new types of cells. B. examine and describe cells. C. copy genetic material. D. develop unique chemicals. Which cell part contains directions for cell growth and reproduction? A. cell wall B. plasma membrane C. nucleus D. pores
1. Different ideas from different scientists (such as schleiden and schwann)
2. B. Describe and examine cells
3. Sorry i don't remember this
hope this helps :)
Final answer:
The development of the cell theory was a collaborative effort by different scientists, including Schleiden, Schwann, and Virchow, and the invention of the microscope allowed for cells to be examined and described, making 'A. different ideas from different scientists' and 'B. examine and describe cells' the correct answers for the respective questions. The nucleus contains directions for cell growth and reproduction, so 'C. nucleus' is the correct answer for the third question.
Explanation:
The development of cell theory involved different ideas from different scientists. Scientists like Schleiden, Schwann, and Virchow contributed to the theory that all organisms are made of cells, all life functions occur within cells, and all cells come from other cells. Hence, the correct answer to the first part of the question is A. different ideas from different scientists.
The invention of the microscope, including the advanced electron microscope in the 1950s, allowed scientists to examine and describe cells. They were able to see organelles and other structures inside cells for the first time. Therefore, the answer to the second part of the question is B. examine and describe cells.
As for the cell part containing directions for cell growth and reproduction, the correct answer is C. nucleus. The nucleus of a cell contains DNA, which holds the hereditary material and instructions for cell growth, function, and reproduction.
Which of the following is not an intensive physical property?
A. Electrical conductivity
B. Mass
C. Density
D. Freezing point
The answer should be "A. Electrical Conductivity". I really hope I helped! Have a great day!
Is shredding paper a physical or chemical change?
Explain why?
scientist are always learning new things. which of the following shows how scientist use observations to gain new understanding about the world?