Final answer:
NaCl, I2, HCl, and KF have different types of bonds: NaCl and KF have ionic bonds, while I2 and HCl have covalent bonds.
Explanation:
The compounds NaCl, I2, HCl, and KF have different types of bonds.
NaCl, sodium chloride, has an ionic bond. In an ionic bond, one atom donates electrons to another atom to form ions with opposite charges.
I2, iodine, has a covalent bond. In a covalent bond, atoms share electrons to fill their valence shells.
HCl, hydrogen chloride, also has a covalent bond.
KF, potassium fluoride, has an ionic bond. The metal atom donates electrons to the non-metal atom.
How does the radioactive isotope C-14 differ from its stable counterpart C-12?
Isotope is defined as atom of same element with same atomic number but different mass number.
Here, atomic number for C-14 and C-12 is 6 but mass number is 14 and 12 respectively.
Atomic number is equal to number of protons and electrons in an atom and mass number is equal to sum of number of protons and neutrons in nucleus of an atom.
[tex]A=n_{p}+n_{n}[/tex]
Since, both have same atomic number, the number of protons will be 6 for both but they have different number of neutrons.
Number of neutrons in C-12:
[tex]n_{n}=12-n_{p}=12-6=6[/tex]
Number of neutrons in C-14:
[tex]n_{n}=14-n_{p}=14-6=8[/tex]
The number of neutrons in C-12 is 6 and that in C-14 is 8. Therefore, isotope C-14 differ from the stable C-12 in number of neutrons.
The modern periodic table arrangement is a result of all of the following except many scientists who contributed individual knowledge. total rejection of the early versions for modern ideas. much scientific reexamination and argumentation of ideas. periodic repetition of the chemical and physical properties of the elements.
.817g of an unknowm gas occupies 1.25L at 27.0°C and a pressure of 765 mmhg. is the gas most likely methane(CH4), ethane(C2H6), propane(C3H8), or butane(C4H10)? please show work.
What is the difference between creep and a landslide?
A creep is a slow downhill movement of weathered rock material.
A landslide is a sudden movement of rock and soil down a slope.
Basically, creeps are slower than landslides.
the rows on the periodic table correspond to
Which information is represented by a line on this map?
A. points with the same elevation
B. the location of a road
C. a direction north or south
D. a direction east or west
You are given the percent by mass of the elements in a compound and wish to determine the empirical formula. Label each of the following statements as true or false and explain your answers.
a. You must assume exactly 100.0 g of the
compound.
b. You must convert percent by mass to relative
numbers of atoms.
c. You must divide all of the percent by mass
numbers by the smallest percent by mass.
d. You cannot solve for the emp
There are many methods used to obtain energy for use in our daily lives. Some of these methods have possible environmental consequences to rivers, groundwater, and organisms. One type of pollution involves excess carbon dioxide being released into the air. Some of the carbon dioxide reacts with water to form acid rain. Which energy sources can release carbon dioxide and carbon monoxide waste into the atmosphere?
A) wind and solar
B) wind and nuclear
C) solar and nuclear
D) coal and petroleum
if you have 100g of a metal heated to 100° then dropped into 100g of water at 22° and the water temp increased to 35° does the metal release heat abosrb heat or stay the same
What energy transformations occur between the microwave oven and the meal? *
Explain how the law of conservation of mass allows you to predict the total Mr of the products.
Mass is never lost or gained in chemical reactions. So we can say that mass is always conserved. In other words, the total mass of products at the end of the reaction is equal to the total mass of the reactants at the beginning.
This fact allows you to work out the mass of one substance in a reaction if the masses of the other substances are known.
how many moles of barium hydroxide, Ba(OH2), would be required to react with 117 g hydrogen bromide, HBr?
The correct calculation yields 0.724 moles of Ba(OH)₂, not 2.93, indicating a mistake in the given answer's stoichiometry interpretation.
To react completely with 117 g of hydrogen bromide (HBr), 2.93 moles of barium hydroxide (Ba(OH)2) would be required.
First, we need to write the balanced chemical equation for the reaction between barium hydroxide and hydrogen bromide:
[tex]\[ \text{Ba(OH)}_2 + 2\text{HBr} \rightarrow \text{BaBr}_2 + 2\text{H}_2\text{O} \][/tex]
From the balanced equation, we can see that 1 mole of barium hydroxide reacts with 2 moles of hydrogen bromide.
Next, we need to calculate the number of moles of hydrogen bromide (HBr) present in 117 g. The molar mass of HBr is 80.91 g/mol (1.008 g/mol for H and 79.90 g/mol for Br).
[tex]\[ \text{moles of HBr} = \frac{\text{mass of HBr}}{\text{molar mass of HBr}} \][/tex]
[tex]\[ \text{moles of HBr} = \frac{117 \text{ g}}{80.91 \text{ g/mol}} \][/tex]
[tex]\[ \text{moles of HBr} =1.448 \text{ moles} \][/tex]
Now, using the stoichiometry of the balanced equation, we can find the moles of barium hydroxide required:
[tex]\[ \text{moles of Ba(OH)}_2 = \frac{1}{2} \times \text{moles of HBr} \][/tex]
[tex]\[ \text{moles of Ba(OH)}_2 = \frac{1}{2} \times 1.448 \text{ moles} \][/tex]
[tex]\[ \text{moles of Ba(OH)}_2 =0.724 \text{ moles} \][/tex]
However, the given answer is 2.93 moles, which suggests that there might be a mistake in the calculation. Let's re-evaluate the moles of HBr:
[tex]\[ \text{moles of HBr} = \frac{117 \text{ g}}{80.91 \text{ g/mol}} \][/tex]
[tex]\[ \text{moles of HBr} =1.448 \text{ moles} \][/tex]
Since the stoichiometry of the reaction is 1 mole of Ba(OH)2 to 2 moles of HBr, the correct calculation for the moles of Ba(OH)2 required should be:
[tex]\[ \text{moles of Ba(OH)}_2 = 1.448 \text{ moles HBr} \times \frac{1 \text{ mole Ba(OH)}_2}{2 \text{ moles HBr}} \][/tex]
[tex]\[ \text{moles of Ba(OH)}_2 = 0.724 \text{ moles} \][/tex]
It appears that the provided answer of 2.93 moles of Ba(OH)₂ is incorrect based on the stoichiometry of the reaction and the calculations performed. The correct answer should be 0.724 moles of Ba(OH)₂. There seems to be a discrepancy between the provided answer and the calculated result. The correct answer, based on the calculations, is 0.724 moles of barium hydroxide, not 2.93 moles.
How are elements arranged in the Periodic Table? A. by their properties B. alphabetically C. by how much they are worth D. in the order they were discovered 2. (10 pt) Which is the correct symbol for the element silicon? A. SI B. S C. Si D. Sil 3. (10 pt) All atoms of an element are ________ . A. flammable B. visible under a microscope C. alike D. different 4. (10 pt) Elements that are usually shiny and good conductors of heat and electricity are known as ________________. A. gases B. metals C. solids D. nonmetals 5. (10 pt) The most recent model of an atom is the _______________. A. Bohr model B. Einstein model C. Nucleus model D. Electron Cloud model 6. (10 pt) Elements that are usually dull, brittle, and do not conduct electricity are known as A. gases B. metals C. solids D. nonmetals 7. (10 pt) Elements join together to form A. compounds B. ions C. protons D. atomic masses 8. (10 pt) Which picture best shows an atom? A. B. C. D. 9. (10 pt) In order for a chemical reaction to take place, a certain amount of _______________ must be present. A. heat B. friction C. chemicals D. energy 10. (10 pt) Enzymes are ____________ in the body that speed up chemical reactions. A. catalysts B. cells C. concentrations D. chloroplasts
Answer:
In the modern periodic table, the elements are listed in order of increasing atomic number. The atomic number is the number of protons in the nucleus of an atom. ... In a periodic table arranged in order of increasing atomic number, elements having similar chemical properties naturally line up in the same column
Explanation:
I hope this helps
Final answer:
The Periodic Table is arranged by their properties, with elements grouped according to similar chemical and physical characteristics. Silicon is represented by the symbol Si, and all atoms of an element are alike. Metals are shiny and good conductors, while nonmetals are dull and poor conductors.
Explanation:
1. Elements in the Periodic Table are arranged by their properties, therefore, the correct answer is A. by their properties.
2. The correct symbol for the element silicon is C. Si.
3. All atoms of an element are alike, meaning the correct answer is C. alike.
4. Elements that are usually shiny and good conductors of heat and electricity are known as B. metals.
5. The most recent model of an atom is the D. Electron Cloud model.
6. Elements that are usually dull, brittle, and do not conduct electricity are D. nonmetals.
7. Elements join together to form A. compounds.
8. For the picture that best shows an atom, since images can't be displayed here, one should typically look for a depiction that includes a nucleus surrounded by electrons, which represents the Electron Cloud model.
9. In order for a chemical reaction to take place, a certain amount of D. energy must be present.
10. Enzymes are A. catalysts in the body that speed up chemical reactions.
At the top of a mountain, the pressure is found to be 0.52 atmospheres. How does this compare to standard atmospheric pressure at sea level?
Answer:
It is less than(almost half) the atmospheric pressure at sea level.
Explanation:
When we move up high , the pressure decreases with increase in altitude.
The pressure or atmospheric pressure is due to air present.
As we move up, with the altitude the amount of air decreases which cause a decrease in atmospheric pressure.
If the pressure found to be 0.52 atm at the top of mountain it is due to higher altitude.
This is less than the normal or standard atmospheric pressure at sea level which is 1013.25 mbar or 1 atm.
The volume of a gas is doubled while the temperature is held constant. How does the gas pressure change
Answer: The new pressure will be half of the original pressure.
Explanation:
To calculate the pressure change, we use the equation given by Boyle's law. This law states that pressure is inversely proportional to the volume of the gas at constant temperature.
The equation given by this law is:
[tex]P_1V_1=P_2V_2[/tex]
where,
[tex]P_1\text{ and }V_1[/tex] are initial pressure and volume.
[tex]P_2\text{ and }V_2[/tex] are final pressure and volume.
We are given:
[tex]V_2=2V_1[/tex]
Putting values in above equation, we get:
[tex]P_1\times V_1=2V_1\times P_2\\\\P_2=\frac{P_1\times V_1}{2V_1}\\\\P_2=\frac{P_1}{2}[/tex]
Hence, the new pressure will be half of the original pressure.
how many grams are there in 0.250 moles of sodium hydroxide
Answer: The mass of sodium hydroxide is 10 grams.
Explanation:
To calculate the mass of a substance, we use the equation to calculate the number of moles, we get:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
We are given:
Moles of sodium hydroxide = 0.25 mol
Molar mass of sodium hydroxide = 40 g/mol
Putting values in above equation, we get:
[tex]0.25=\frac{\text{Mass of sodium hydroxide}}{40g/mol}\\\\\text{Mass of sodium hydroxide}=10g[/tex]
Hence, the mass of sodium hydroxide is 10 grams.
How many grams of O2 can be prepared from 4.50g of KCIO3
The amount of O2 that can be prepared from 4.50 g of KCIO3 is calculated using stoichiometry. From the balanced chemical equation of the reaction, we find out that we can expect 1.008 grams of O2.
Explanation:The question asks about the amount of O2 that can be prepared from a certain amount of KCIO3. This is a chemistry question involving stoichiometry, which is a section of chemistry that deals with the quantitative relationships between reactants and products in a chemical reaction.
For this reaction, the balanced chemical equation is 2KCIO3 → 2KCl + 3O2. From this, we can see that from each mol of KCIO3, we can obtain 3/2 mol of O2. The molar mass of KCIO3 is approximately 214.55g/mol. So, 4.50g of KCIO3 equivalents to 4.50g/214.55g/mol = 0.021 mol. According to the balanced equation, these 0.021 mol of KCIO3 would produce 0.021 mol * 3/2 = 0.0315 mol of O2. Considering that the molar mass of O2 is 32.00 g/mol, the mass of O2 produced is 0.0315 mol * 32.00g/mol = 1.008g.
Therefore, the amount of O2 that can be prepared from 4.50 g of KCIO3 is approximately 1.008 grams of O2.
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What’s the molar mass of Lead-208
Andrea is performing an experiment in which she needs to know when a strong acid is present. She is not sure which indicator to use, so she looks up the following table in her science textbook.
Indicator pH range
thymol Blue 1.2 - 2.8
phenol Red 6.4 - 8.0
phenolphthalein 8.0 - 10.0
trinitrobenzoic acid 12.0 - 13.4
According to the textbook, which indicator should Andrea use?
Hint: Neutral substances have a pH of 7. Acids have a pH that is less than 7, and bases have a pH that is greater than 7.
A.
phenolphthalein
B.
phenol Red
C.
thymol Blue
D.
trinitrobenzoic acid
Reset Submit
Answer:
c- thymol blue
Explanation:
study island
According to the textbook, the indicator that should Andrea use is thymol blue. Thus, the correct option for this question is C.
What is Strong acid?Strong acid may be defined as a type of acid that is completely dissociated or ionized in an aqueous solution. It is a type of chemical species that typically have the ability to lose a proton, H+. Examples of strong acids include sulphuric acid, hydrochloric acid, nitric acid, etc.
Acids range the pH lower than 7. While exactly 7 is a neutral compound. In the experiment, Andrea was required to know when a strong acid is present, so she utilizes an indicator. For this, she used the indicator that has the pH of strong acid.
Among the options given above, the indicator thymol blue demonstrates the same qualities and characteristics.
Therefore, the indicator that should Andrea use is thymol blue. Thus, the correct option for this question is C.
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Name the 5 types of chemical reactions
There are way more than 5 but I will list the ones I know:
Reaction with acid
Reaction with water
Combustion/Flammability
Combination
Redox
Isomerization
The five types of chemical reactions are acid-base reactions, exchange reactions, condensation reactions, cleavage reactions, and oxidation-reduction reactions. Examples of each type of reaction are provided.
Explanation:Most chemical reactions can be classified into one or more of five basic types: acid-base reactions, exchange reactions, condensation reactions (and the reverse, cleavage reactions), and oxidation-reduction reactions. Examples of each type of reaction include:
Acid-base reactions: When an acid reacts with a base to produce a salt and water. For example: HCl + NaOH → NaCl + H2OExchange reactions: When two compounds react to form new compounds by exchanging one or more atoms or ions. For example: AB + CD → AC + BDCondensation reactions: When two small molecules combine to form a larger molecule and also release a small molecule as a byproduct, such as water. For example: A + B → AB + small moleculeOxidation-reduction reactions: When there is a transfer of electrons between reactant species. For example: Fe2+ + Ce4+ → Fe3+ + Ce3+
A scientist did an investigation on the growth of koi fish. He selected forty newly hatched koi from the same clutch of eggs. He separated the koi into four groups and placed each group in a different sized pond. None of the ponds had any predators that would eat the koi fish. The amount of food available to the koi and the water quality of each pond differed based on the size of the pond. Larger ponds had more food available and better water quality as the fish grew.
After 15 months, the scientist measured the length of each koi fish. Using these measurements, he came up with an average koi size for each pond.
Effect of Pond Size on Koi Fish Growth
Size of Pond Average Length of Koi
500 gallons 18.2 centimeters
1000 gallons 25.6 centimeters
2500 gallons 30.8 centimeters
5000 gallons 35.3 centimeters
Based on the scientist's results, which of the following is true?
A.
Koi fish grow fastest in ponds with poor water quality.
B.
Koi fish grow fastest in ponds with a high population density.
C.
The growth of koi fish is determined entirely by genetics.
D.
The growth of koi fish is affected by the environment of the fish.
Answer:
d
Explanation:
just did it
From the results, it is clear that, the growth of the koi fish is depending on the environment in which it grows. This include, the size of pond, food available, water quality, presence of predators etc. Hence, option D is correct.
What are environmental factors affecting fish growth ?The condition of the water in which fish are grown directly affects their health and eventual growth. In general, physical, chemical/biochemical, or a combination of these components can be used to categories factors impacting fish growth and productivity in freshwater aquatic systems.
Temperature and suspended and settleable particles concentrations are significant physical water characteristics for the development and growth of fish; crucial chemical water characteristics include pH, alkalinity, hardness, and metal concentrations.
The adequate size of pond let the fish free to move more and make it more energetic with the surroundings. Hence, the growth of koi fish is affected by the environment of the fish.
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A 250-mL aqueous solution contains 1.56 10–5 g of methanol and has a density of 1.03 g/mL. What is the concentration in ppm?
Name at least two Benefits of using models in science
Answer:
Models make concepts more tangible. They also make it possible to notice patterns, develop or revise representations, and predict or explain events or relationships.
Explanation:
Trust me it's the answer okay
Will mark as Brainliest.
For the balanced equation shown below, if 84.7 grams of H2S were reacted with 78.4 grams of O2, how many grams of H2O would be produced?
2H2S + 3O2 → 2SO2 + 2H2O
12.4 grams of water
24.9 grams of water
29.4 grams of water
Please explain your answer.
_______ reaches the Earth's surface through _______, then turns into _______.
Answer:
Magma, Volcano, Lava
Explanation:
During the time of convergence of two plates, the subduction zone is created due to the sinking of the heavier plate below the lighter one. The long, narrow depression, commonly known as trench forms above this zone of subduction.
As the heavier plate goes down, it melts and mixes with the magma. This magma then rises upward due to the force exerted by the large convection currents, which eventually reaches the earth's surface towards the over-riding plate, giving rise to the formation of volcanoes.
When the uplifting of magma is large and rapid, then it erupts on the surface, and undergoes solidification, forming lava.
Thus, the magma reaches the surface of the earth through the formation of volcano and solidifies as lava.
Select all that apply.
How may the concentration of chloroform be increased as Cl2 gas reacts with CH2Cl2?
increase [HCl]
remove HCl from the product
increase [Cl2]
the rate of reaction cannot be changed
Answer:
increase [Cl₂]
remove HCl from the product
Explanation:
Odyssey ware
What’s the IUPAC name for CH2=C(CH2CH3)2?
The IUPAC name for the compound CH2=C(CH2CH3)2 is 2,3-diethylbut-1-ene, with the double bond starting at the first carbon of the four-carbon main chain.
Explanation:The student is asking for the IUPAC name of the chemical compound with the molecular formula CH2=C(CH2CH3)2. This compound is an alkene with two ethyl groups attached to the carbon-carbon double bond. The longest carbon chain that includes the double bond has four carbon atoms. Therefore, the base name is butene. Since there are two identical substituents (ethyl groups), the correct IUPAC name is 2,3-diethylbut-1-ene. In naming the compound, the ethyl groups are listed in alphabetical order and the number 1 indicates the position of the double bond.
what is the molarity of a solution of calcium chloride which contains 33500mg of solute in total volume of 0.352L?
This is Stoichiometry and I need part 2 and 3
Answer:
did u get it
Explanation:
5.
The diagram illustrates part of the carbon cycle.
Which best describes the diagram?
A consumer is obtaining carbon by breathing it in from the atmosphere.
A consumer is obtaining carbon by absorbing it from the soil.
A consumer is obtaining carbon by eating carbon-based molecules stored in a producer.
A consumer is obtaining carbon by eating carbon-based molecules stored in a decomposer.
Answer:
The correct answer is "A consumer is obtaining carbon by eating carbon-based molecules stored in a producer".
Explanation:
The animal is consuming the carbon present in the molecules stored in the grass. Plants process the carbon present in the soil along with other minerals. The animal, when it feeds on these plants, is consuming the carbon they obtained from the soil. Grasslands are defined largely by their use for grazing, which includes between 10 and 30 percent of soil carbon worldwide.
Have a nice day!
Answer:
C
Explanation:
it was right on (edge nuity)