Answer:
Density
Explanation:
Density is not unique only to water. All liquids have density. Liquids have density either higher or lower than that of water. All liquids have mass and they occupy the volume of the container in which they are kept. Density is the ratio of mass to volume.
Density = mass/ volume.
As all liquids have mass and volume they also have density.
Which of the following indicates that an exothermic reaction has taken place?
A. a change in color
B. release of heat and/or light energy
C. cooling of the surroundings
D. absorption of heat by the reaction ...?
The option B is correct option. Which is release of heat and/or light energy .
Explanation:According to the definition of exothermic reaction :
An exothermic reaction is a chemical reaction that releases energy by light or heat.
From definition option B (release of heat and/or light energy) indicates that an exothermic reaction has taken place.
.
Answer: Option (B) is the correct answer.
Explanation:
An exothermic reaction is defined as the chemical reaction in which there occurs release of heat.
For example, [tex]A + B \rightarrow AB + Heat[/tex]
In an exothermic reaction, energy of reactants is more than the energy of products.
Whereas an endothermic reaction is defined as a chemical reaction in which heat is absorbed by reactant molecules.
For example, [tex]A + B + Heat \rightarrow AB[/tex]
In endothermic reaction, energy of reactant molecules is less than the energy of products.
Thus, we can conclude that release of heat and/or light energy indicates that an exothermic reaction has taken place.
how would convert 1450000mg to scientific notation and what's the answer PLEASE ANSWER!!!
1450000mg is 1.45mg x 10^6
The decimal point in 1450000 would be after the last zero so you move that decimal point until it reaches before the last number which is 1 so that gives you 1.45. Count how many times you moved from the original decimal position to the decimal point after 1. The number of times you moved will be your exponent. If you want to check if your answer is right, then move the decimal point of 1.45 to the right by the number of your exponent.
Validate how valence electrons determine the chemical reactivity of an element: give 2 examples of elements with high reactivity and justify your response.
Multichoice
When a double displacement reaction takes place, one of the products must be _____.
1. a salt
2. a gas
3. a precipitate
4. water
Answer: The correct answer is Option 1.
Explanation:
A double displacement reaction is defined as the reaction in which exchange of ions takes place. The general equation for the reaction follows:
[tex]AB+CD\rightarrow AD+CB[/tex]
During this reaction, one of the product formed is always a salt.
A gas is formed in a single displacement reaction and not in double displacement reaction.
A precipitate is formed in some of the double displacement reaction.
Water is formed in neutralization reaction when an acid reacts with a base to produce a salt and water.
Hence, the correct answer is Option 1.
Answer:
a salt
Explanation:
What example involves a phase change in which heat energy is released by the substance
Spontaneous phase changes that leads to an increase in the stability of a substance would release energy. For example, converting a gas to its liquid state such as cooling water vapor below its boiling point releases energy. Cooling allows water molecules to establish intermolecular hydrogen bonds to produce a liquid while releasing energy. The formation of bonds between water molecules is so exothermic that a steam scald can be significantly more serious to treat than a hot water scald.
Answer:
Freezing ice cream :)
Explanation:
i got it right on edge 2021
What is an ephemeral stream? A)one that flows only after rainfall B) one that flows only in flat lands C) one that is formed only from mechanical weathering D) one that is formed only from chemical weathering
Answer: Option (a) is the correct answer.
Explanation:
The stream that flows during or after the rainfall is called an ephemeral stream. This stream occurs in areas where there is less rainfall or deficiency of moisture.
The stream that flows only in flat lands is called as river.
Mechanical weathering results in the breaking of rocks causes ice wedging.
Chemical weathering results in the change in molecular structure of rocks and soil.
Thus, it can be concluded that option (a) is the correct answer.
how would isopropanol behave when poured out of its container onto a table
Isopropanol spread on a table will form a layer that evaporates quickly and may cool the surface or damage materials sensitive to alcohol. It is also flammable, creating a fire risk near open flames or heat sources.
When isopropanol is poured out of its container onto a table, it behaves similarly to how water or other liquids would behave. Due to its low viscosity, isopropanol will spread out across the table's surface, forming a thin layer.
Since isopropanol evaporates much faster than water at room temperature, it would begin to evaporate quickly, leaving behind a cool sensation due to the evaporation process removing heat from the surroundings. If the table is made of a material that can be degraded by alcohol, such as certain plastics or finishes, the isopropanol may also cause damage to the table's surface.
Furthermore, it's important to note that isopropanol is flammable, so if it is poured near an open flame or a heat source, there is a risk of ignition. Therefore, handling isopropanol should be done with caution, and proper ventilation should be ensured to prevent the build-up of flammable vapors.
Which of the following statements about Bohr's model of the atom is true? Bohr's model explains the chemical behavior of all atoms.
Bohr’s model does not take into account the interactions multiple electrons would have with one another.
Bohr's model explains the spectra of atoms with more than one electron.
Bohr's model takes into account the interactions multiple electrons would have with one another.
I believe the answer is "Bohr's model explains the chemical behavior of all atoms."
Which has more calories: table sugar or aspartame?
What is the pH of a solution with a concentration of 3.6 × 10-5 molar H3O+? Show, or explain, the work used to solve this problem.
Answer:
pH = 4.44
Explanation:
You take the negative logarithm of the hydronium ion concentration.
pH = -log[H₃O⁺] = -log(3.6 × 10⁻⁵) = 4.44
Answer:
pH = 4.45
Explanation:
pH is negative logarithm of the hydrogen ion concentration.
Given, hydronium ion concentration = 3.6 x 10⁻⁵
pH = - log[H₃O⁺] = - log(3.6 x 10⁻⁵) = 4.45
A pH below 7.0 means the solution is acidic. Neutral pH is at 7.0. For pH above 7.0 the solution is basic.
What word or two-word phrase best describes the shape of the fluoroform molecule?
The two-word phrase that best describes the shape of the fluoroform molecule is ; Tetrahedral
Fluoroform is a chemical compound represented by the formula CHF₃ which falls within the class of haloforms. The center atom in a fluoroform molecule is the carbon atom which has ( 3 ) C - F bonding and ( 1 ) C - H bonding. This means that the number of electrons is in a fluorocarbon is 4, hence according to VSEPR theory the geometry of the fluoroform molecule will be Tetrahedral.
Hence we can conclude that The two-word phrase that best describes the shape of the fluoroform molecule is ; Tetrahedral
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The shape of the fluoroform molecule is trigonal pyramidal.
Explanation:The shape of the fluoroform molecule is trigonal pyramidal.
A trigonal pyramidal shape occurs when a central atom is bonded to three other atoms and has one lone pair of electrons. In the case of fluoroform (CHCl3), the central carbon atom is bonded to three fluorine atoms and has one lone pair of electrons, resulting in a trigonal pyramidal shape.
Other examples of molecules with trigonal pyramidal shape include ammonia (NH3) and phosphine (PH3).
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You are on an alien planet where the names for substances and the units of measures are very unfamiliar.
Nonetheless, you obtain 8 quibs of a substance called skvarnick in units of sleps; not quibs.
9 sleps is equal to 13 quibs.
If you have 8 quibs of skvarnick, how many sleps do you have?
Round your answer to the nearest tenth (one decimal place). Type only the number; not the number and unit
Given that in the alien planet the names of substances and the units in which they are measured in not familiar.
8 quibs of a substance called skvarnik is present.
The conversion factor between sleps and quibs is: 9 sleps = 13 quibs
Converting 8 quibs of skvarnick to sleps:
[tex]8 quibs * \frac{9 sleps}{13 quips}= 5.54sleps[/tex]
5.54 when rounded to nearest tenth becomes 5.5.
So the correct answer would be 5.5
J.J. Thomson's experiments supported the existence of a particle that deflected away from a negative charge and toward a positive charge. Ernest Rutherford found that when positive particles were fired at gold foil, some of the particles deflected rather than passing straight through. Taken together, these experiments support our understanding of the
A. Flavors or quarks
B. Structures of the atom
C. Specific gravity of gold
D. Law of Conservation of energy
Which two values for `DeltaG` and E°cell correctly indicate a spontaneous reaction?
Well as an spontaneous reaction will have a negative gibbs free energy (delta g) and a positive e cell and also the E cell is also measured in V, then your answer is the first one: ΔG = –295kJ, E°cell = +1.53 v. Hope this works
An atom has 9 electrons and 9 protons at the start . If it loses 2 electrons, the net charge on the atom will be ? If the atom instead gains 4 electrons the net charge will be ?
Answer : If it loses 2 electrons, the net charge on the atom will be (+2) and If it gains 4 electrons, the net charge on the atom will be (-4).
Explanation :
We are given:
Number of electron in an atom = 9
Number of protons in an atom = 9
Atomic number is defined as the number of protons or electrons that are present in a neutral atom.
Atomic number = number of protons = number of electrons
An ion is formed when an atom looses or gains electron.
When an atom looses electrons, it will form a positive ion known as cation.
When an atom gains electrons, it will form a negative ion known as anion.
According to the question,
When the atom loses 2 electrons then the net charge on the atom will be (+2) because it will form a positive ion by losing electrons.
When the atom gains 4 electrons then the net charge on the atom will be (-4) because it will form a negative ion by gains electrons.
A sample of gas in a closed container at a temperature of 100.0°C and 3.0 atm is heated to 300.0°C. What is the pressure of the gas at the higher temperature?
Answer:- 4.6 atm.
Solution:- In this problem, the volume is constant and the pressure is changing as the temperature is changed. It's based on Gay-Lussac's law which states that, "At constant volume, pressure of the gas is directly proportional to the kelvin temperature."
The equation used for solving the problems based on this law is:
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]
Where, [tex]P_1[/tex] is initial pressure and [tex]P_2[/tex] is final pressure.
Similarly, [tex]T_1[/tex] is initial temperature and [tex]T_2[/tex] is final temperature.
[tex]P_1[/tex] = 3.0 atm
[tex]T_1[/tex] = 100.0 + 273 = 373 K
[tex]T_2[/tex] = 300.0 + 273 = 573 K
[tex]P_2[/tex] = ?
Let's plug in the values in the equation and solve it for final pressure:
[tex]\frac{3.0atm}{373K}=\frac{P_2}{573K}[/tex]
[tex]P_2=\frac{(3.0atm*573K)}{373K}[/tex]
[tex]P_2=4.6atm[/tex]
So, the pressure of the gas at higher temperature is 4.6 atm.
Initial temperature of the gas = 100.0°C + 273 = 373 K
Initial pressure of the gas = 3.0 atm
Final temperature of the gas = 300.0°C + 273 = 573 K
According to Pressure Law,
P₁/T₁ = P₂/T₂
where P₁ and T₁ are the initial pressure and temperature respectively, and P₂ and T₂ are the final pressure and temperature respectively.
Plugging in the given data in Pressure Law we have,
3.0 atm/ 373 K = P₂/573 K
P₂ = (3.0 atm x 573 K)/ 373 K
P₂ = 4.6 atm
Thus, the pressure of the gas at the higher temperature is 4.6 atm.
A sample of a substance has a mass of 27.3 grams and a volume of 7.0 centimeters3. The density of this substance is _____ grams/centimeter3.
density = mass/volume=27.3/7=3.9
The density is defined as mass of a substance per unit of its volume
It can be expressed in different units like g/L g/m3 Kg/dm3 etc
We are given that
mass of substance = 27.3 grams
volume of substance = 7 cm^3
the density = Mass of substance / volume of substance
density = 27.3g / 7 cm^3 = 3.9 g /cm^3
Which of the following would label the boxes correctly?
Question 1 options:
1) endothermic; 2) exothermic
1) products; 2) reactants
1) reactants; 2) products
1) exothermic; 2) endothermic
OFFERING 99 POINTS AND BRAINLIEST TO BEST ANSWER!!!
How many valence electrons are in an atom with the electron configuration in example A? Example A: 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 4p^2
A. 22
B. 2
C. 4
D. 6
The x number in ^x indicates the number of electronics in an obit, e.g. 1s^2 means there are 2 electrons in the 1s orbit.
Total number of electrons in A = 2 + 2 + 6 +2 + 6 + 2 + 2
= 22
VALENCE electrons are those in the outer most shell.
In A, there are 4s^2 + 4p^2: 2 + 2 = 4
Answer should be C instead. So sorry for the mistake earlier!
Example A: 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 4p^2
counting e-: 2 2 6 2 6 2 2
2+2+6+2+6+2+2 = 22
ans is A. 22
Which phosphate in this tetranucleotide would be radioactive? Note that the phosphates are numbered 1-4 in red from top to bottom?
The phosphodiester bonds contains a sugar attached to a phosphate group. Since one outermost phosphate is used to form a phosphate bond everytime, from a precursor containing innermost radiolabelled phosphate, the third phosphate groups will be radioactive in nature. So correct answer is 3.
Hope that helps!
What is the pH of a solution with a hydronium (H3O+) concentration of 5.6 × 10-9 M? Use the table to help you.
Answer:
pH = 8.25
Explanation:
pH = -log[H₃O⁺] = -log(5.6 × 10⁻⁹) = 8.25
Answer:
pH of the solution is 8.25 (≅8.3)
Explanation:
Given:
H3O+ ion concentration = 5.6*10⁻⁹ M
To determine:
pH of the given solution
Explanation:
pH is related to the hydronium ion concentration as follows:
[tex]pH = -log[H3O+]\\[/tex]
For the given solution
[tex]pH = -log[5.6*10^{-9}] = 8.25[/tex]
Combustion of 28.30 g of a compound containing only carbon, hydrogen, and oxygen produces 32.75 gco2 and 13.41 gh2o. What is the empirical formula of the compound?
The empirical formula is C₂H₄O₃.
We must calculate the masses of C, H, and O from the masses given.
Mass of C = 32.75 g CO₂ × (12.01 g C/44.01 g CO₂) = 8.9372 g C
Mass of H = 13.4 g H₂O × (2.016 H/18.02 g H₂O) = 1.5067 g H
Mass of O = Mass of compound - Mass of C - Mass of H
= (28.30 – 8.9372 – 1.5067) g = 17.856 g
Now, we must convert these masses to moles and find their ratios. If the ratios are not integers, we multiply them by a number to make them close to integers.
From here on, I like to summarize the calculations in a table.
Element m/g n/mol Ratio ×2 Integers
C 8.9372 0.74415 1 2 2
H 1.5067 1.4948 2.0086 4.0174 4
O 17.856 1.1160 1.4997 2.9994 3
The empirical formula is C₂H₄O₃.
Final answer:
To determine the empirical formula of the compound, the masses of products from combustion are used to calculate the moles of carbon, hydrogen, and oxygen. These are then converted to a mole ratio and simplified to a whole number ratio. The empirical formula of the compound is C2H4O3.
Explanation:
To find the empirical formula of a compound from the given combustion data, we start by converting the masses of CO2 and H2O produced to masses of carbon and hydrogen. From the mass of carbon dioxide, we determine the mass of carbon in the compound. Since 1 mole of CO2 contains 1 mole of carbon atoms, and the molar mass of carbon is 12.01 g/mol, we can calculate the amount of carbon.
32.75 g CO2 × (1 mol CO2 / 44.01 g CO2) × (12.01 g C / 1 mol C) = 8.93 g of Carbon
Next, from the mass of water, we determine the mass of hydrogen in the compound. As 1 mole of H2O has 2 moles of hydrogen atoms, we calculate the hydrogen mass as follows:
13.41 g H2O × (1 mol H2O / 18.02 g H2O) × (2 g H / 1 mol H) = 1.49 g of Hydrogen
The remaining mass must be oxygen, as it's the only other element present. Subtracting the masses of carbon and hydrogen from the total mass of the compound gives us the mass of oxygen in the compound:
28.30 g compound - 8.93 g C - 1.49 g H = 17.88 g of Oxygen
Converting the masses of carbon, hydrogen, and oxygen to moles, we get:
C: 8.93 g / 12.01 g/mol = 0.744 molH: 1.49 g / 1.008 g/mol = 1.477 molO: 17.88 g / 16.00 g/mol = 1.117 molTo find the simplest whole number ratio, we divide the moles of each element by the smallest number of moles calculated, which is for carbon (0.744 mol):
C: 0.744 mol / 0.744 mol = 1H: 1.477 mol / 0.744 mol ≈ 2O: 1.117 mol / 0.744 mol ≈ 1.5Since we can't have a half in an empirical formula, we multiply each ratio by 2 to get whole numbers:
C: 1 × 2 = 2H: 2 × 2 = 4O: 1.5 × 2 = 3Thus, the empirical formula of the compound is C2H4O3.
If u like a gurl how woud u kno (plz i need to kno)
Answer:
do u got a MAN
Explanation:
CUZ i GOTTA KNOW
Joey and Ross designed an experiment to test the effectiveness of the newest acne cream on the market, Zit-B-Gone. Joey followed the manufacturer's directions for a total of 10 days. Each day Joey and Ross counted the number of blemishes on Joey's face and recorded the results. At the end of the 10 days, they created a line graph of their data. They concluded that Zit-B-Gone was not effective in removing blemishes. Janice, a representative from the company, sees their results and tells them, "Zit-B-Gone works just fine...Look at how your blemishes decreased in the first few days." How should Joey and Ross respond to Janice?
A) They should ignore the data after day 5 and agree with Janice.
B) They should restart the whole experiment and throw out all of the current data.
C) They should say that Zit B Gone was not effective because the blemishes reappeared.
D) They should agree with Janice and realize that they have looked at the data wrongly.
The correct answer is C
Joe and Ross should respond to Janice by saying that Zit B Gone was not effective because the blemishes reappeared.As the blemishes reappeared there could possibly be an error in their results.
What is an error?Errors in chemical analysis result when there is a difference between observed value and the true value.If the magnitude of errors is large , it results in decrease in accuracy, reproducibility, and precision.
There are three types of errors:1) random error 2) systematic error 3) human error.The cause of random errors are difficult to quantify while the human errors can be minimized by taking a range of readings to reduce the error.
Errors while measuring boiling point may be human errors while noting down the boiling temperature or instrumental or systematic error if there is a fault in the thermometer.
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What is the chemical name of the compound K2SO4?
Potassium Sulfate
Explanation:Potassium sulfate is a non-flammable white crystalline salt which is soluble in water. The chemical compound is commonly used in fertilizers, providing both potassium and sulfur.
Only the _____ word in an organism's complete scientific name has its first letter capitalized
Answer:
it's first I don't know why that dude has such a low rating I got it correct from his/her answer.
Explanation:
A basketball weigh more after it was inflated with air then when it was deflated how does this show that gas is matter
The fact that a basketball weighs more when inflated compared to when it's deflated is indicative that gas (air, in this case) is matter because it contributes to the mass and occupies space within the basketball.
Explanation:The phenomenon that a basketball weighs more after it is inflated with gas (in this case, air) compared to when it is deflated, shows us that gases have mass and occupy space, hence they are considered matter. The principle of matter states that it has mass and occupies space. When you inflate the basketball, you are filling it with air, which is a gas, and increases the total mass of the basketball. Thus, making the basketball heavier than it was when it was deflated. This change in weight clearly demonstrates that gas is indeed matter as it contributes to the overall mass of the basketball.
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Based on their locations in the periodic table, which best compares the properties of the metalloids arsenic and antimony?
Answer:
Arsenic has a more nonmetallic behavior than antimony because arsenic's atoms have fewer electron shells.
Explanation:
The movement of organisms into a range is called
A. immigration.
B. emigration.
C. population shift.
D. carrying capacity.
Immigration is the movement of organisms into a population, increasing its size and growth rate. Emigration is the movement out of a population. Carrying capacity is the maximum population size that the environment can sustain. Hence, option A, immigration, is correct.
The movement of organisms into a range is called immigration. Immigration is the movement of individuals into a population from other areas, which increases the population size and growth rate. In contrast, emigration refers to the movement of individuals out of a population's range. When an animal migrates, it does so because it can find resources there or because the habitat is a good fit for it. When an animal emigrates, it signifies that its natural habitat is no longer good for it and that it must find a new one. The definition of population change is a shift in the proportions of the various groups of people that make up a population. Carrying capacity is related to population size as well, but it describes the maximum number of individuals of a species that the environment can support, not the movement into a range. Thus, the correct answer to the question is A. immigration.
Which of the ailments listed had a frequency of three?
i need to see the frequencies.