Answers
Related Questions
HOTS
A container made of same metal when exposed to
humid climate develops green coating.
Identify the metal. Give reason for both a & b.
Answers
Identify the element that can be found in the 5th period and 4th group on the Periodic Table.
As
Zr
Sn
V
Answers
What force causes a ball to move
Answers
Answer: aerodynamic force
Explanation:
The time-varying aerodynamic force causes the ball to move erratically. This motion is the source of the "dancing" knuckleball that confuses both batters and catchers alike.
Need help now !! Which biome will a biologist visit to see reindeer and wolves that live near a region with lots
of pine trees? (1 point)
O a desert
a taiga
O a tundra
O a tropical rain forest
Answers
What causes an object sliding on a surface to stop?
Answers
An object sliding on a surface eventually stops due to friction.
Friction is a force that opposes motion between two surfaces that are in contact with each other. When an object is sliding on a surface, there is friction between the object and the surface, which acts in the opposite direction to the motion of the object.
Friction is caused by the microscopic irregularities on the surfaces that are in contact with each other. As the object slides along the surface, these irregularities cause interlocking between the object and the surface, which resists the motion of the object.
As an object slides on a surface, the frictional force gradually slows it down until it comes to a stop. The amount of time it takes for an object to stop sliding depends on factors such as the initial speed of the object, the mass of the object, and the strength of the frictional force.
To know more about object, here
brainly.com/question/26864790
#SPJ4
which gas is not an example of a naturally occurring greenhouse gas?responsesnitrous oxidenitrous oxidemethanemethanechlorofluorocarbonchlorofluorocarbonwater vapor
Answers
Chlorofluorocarbons (CFCs) are not naturally occurring greenhouse gases.
Chlorofluorocarbons (CFCs) are not naturally occurring greenhouse gases. They are synthetic compounds that were widely used in refrigerants, solvents, and aerosol propellants.
CFCs were found to deplete the ozone layer in the upper atmosphere, leading to the adoption of the Montreal Protocol to phase out their use.
While they are not naturally occurring, they contribute significantly to global warming due to their strong greenhouse effect.
To know more about Chlorofluorocarbons refer here:
https://brainly.com/question/16159504
#SPJ11
disadvantages of hard water
Answers
Answer:
Here are some disadvantages
Explanation:
Hard water does not pose a health threat.
Hard water can contribute to dry skin and hair.
Hard water is unfit for washing as it is difficult to form lather with soap.
Trimming of kettles will take place due to the formation of magnesium and carbonates of calcium.
The Taste/Smell
Lather
Dishwashing Ability
Clothes-Washing Ability
Staining
Limescale Buildup
Corrosion
1 2 3 Why is it better to use the metric system, rather than the English system, in scientific measurement? O The English system uses one unit for each category of measurement. O The metric system uses one unit for each category of measurement. O The English system uses consistent fractions that are multiples of 10. O The metric system utilizes a variety of number conversions.
Answers
Answer:
\(The \: metric \: system \: uses \: one \: unit \: for \: each \: \\ category \: of \: measurement. \)
which subatomic particles are located in the nucleus of a ca-40 atom?
1) electrons and neutrons
2) electrons and protons
3) neutrons and protons
4) neutrons, protons, and electrons
Answers
Answer:
3) neutrons and protons
Explanation:
I just completed Grade 11 Chemistry with a 97% and I'm still under the impression that all atoms have only neutrons and protons in their nuclui.
I apologize if this is a question above my current education.
Measuring Liquid Volume Pre-Lab worksheet
Answers
1. The longer distance for each choice is:
1 mile1 meter1 inch2. The complete statements are as follows;
1 mi = 1.6 km1 yd = 0.9444 m1 in = 2.54 cm3. The basic unit of length in the metric system is the meter and is represented by a lowercase m.
4. The meter is defined as the distance traveled by light in absolute vacuum in 1⁄299,792,458 of a second.
5. The values that complete each statement is given below:
1 km = 1000 m1 m = 100 cm1 m = 1000 mm6. The larger value for each option is:
A. 105 centimetersB. 4400 metersC. 12 centimetersD. 1200 millimeters7. The number of millimeters in 1 centimeter is 10 mm
8. Using the ruler and line, the answers are:
2.8 cm29 mm3 cmWhat is the unit for measuring distance in the metric system?The unit for measuring distance in the metric system is the meter. Smaller and larger values of the meter are also used such as millimeters, centimeters, kilometers, etc.
Other units for measuring distance include yards, miles, and inches.
The various units for measuring distance can also be interconverted using their conversion factors.
Learn more about the metric system at: https://brainly.com/question/1837503
#SPJ1
Using the equation: 3 NO2(g)H2O-->2 HNO3(aq)+ NO (g)If you start with 10.0 g of NO2(g) and 30.0 g of H2O0):a. What is the limiting reagent for this reaction?b. How many grams of nitric acid can be produced? (theoretical yield)
Answers
Answer:
a. The limiting reagent is NO2.
b. 126g of nitric acid can be produced.
Explanation:
1st) It is necessary to write the balanced equation:
\(3NO_2+H_2O\text{ }\rightarrow2HNO_3\text{ + NO}\)From the balanced equation we know that 3 moles of NO2 (3x46g= 138g) react with 1 mol of water (18g/mol) to produce 2 moles of nitric acid (2x63g= 126g) and 1 mol of NO (30g/mol).
2nd) To calculate the limiting reagent it is necessary to use the given values and the stoichiometry of the balanced equation:
\(\begin{gathered} 138gNO_2-18gH_2O \\ 10.0gNO_2-x=\frac{10.0gNO_2\cdot18gH_2O}{138gNO_2} \\ x=1.30gH_2O \end{gathered}\)The 10.0g of NO2 will need 1.30g of H2O to react.
\(\begin{gathered} 18gH_2O-138gNO_2 \\ 30.0gH_2O-x=\frac{30.0gH_2O\cdot138gNO_2}{18gH_2O} \\ x=230gNO_2 \end{gathered}\)The 30.0g of H2O will need 230g of NO2 to react.
So, as we only have 10.0g of NO2 and 30.0g of H2O, the limiting reagent will be NO2.
3rd) Now, to calculate the theorical yield, we need to use the stoichiometry of the balanced equation using the limiting reagent:
1 mol of H2O produces 2 moles of nitric acid. With the molar mass of nitric acid (63g/mol), we can calculate the grams.
\(2\text{moles}\cdot(\frac{63g}{1\text{mol}})=126g\)
Finally, 126g of nitric acid will be produced if the reaction is 100% efficient (theoretical yield).
The greater the electronegativity difference between two bonded atoms, the A. greater the bond order. B. greater the ionic character of the bond. C. more unstable the bond. D. greater the covalent character of the bond. E. none of the above
Answers
The greater the electronegativity difference between two bonded atoms, the greater the ionic character of the bond. Option B.
The electronegativity difference between two bonded atoms determines the bond polarity. It is calculated by subtracting the electronegativity of the less electronegative atom from that of the more electronegative atom. Bond polarity can range from nonpolar covalent to polar covalent to ionic.
The greater the electronegativity difference between two bonded atoms, the greater the ionic character of the bond. If the electronegativity difference between the bonded atoms is greater than 1.7, the bond is ionic. The bond is polar covalent if the electronegativity difference is between 0.4 and 1.7, and it is nonpolar covalent if the electronegativity difference is less than 0.4.
Bonding character is determined by the electronegativity difference between two bonded atoms. The more electronegative an element is, the more it pulls electrons toward itself. As a result, electronegative atoms acquire a partial negative charge, whereas less electronegative atoms acquire a partial positive charge.
As a result, the bond between them is polarized. The bond is classified as covalent if it is polarized and the bond is classified as ionic if the electronegativity difference between the atoms is quite significant.
To learn more about ionic, click here:
https://brainly.com/question/14614762
#SPJ11
A sample of hydrogen gas occupies 14.1 L at STP. How many moles of the gas are present?
Answers
The number of moles of the gas present is 0.6245 moles.
Mole ratio calculation.
STP stands for Standard Temperature and Pressure, which is defined as a temperature of 273.15 K (0°C) and a pressure of 1 atmosphere (atm). At STP, one mole of any ideal gas occupies a volume of 22.4 L.
Using the ideal gas law, we can calculate the number of moles of hydrogen gas present in a sample of 14.1 L at STP:
PV = nRT
where P = pressure, V = volume, n = number of moles, R = gas constant, and T = temperature.
At STP, P = 1 atm and T = 273.15 K. The gas constant R is 0.08206 L atm/mol K.
Substituting the values into the equation, we get:
(1 atm) (14.1 L) = n (0.08206 L atm/mol K) (273.15 K)
Simplifying and solving for n, we get:
n = (1 atm x 14.1 L) / (0.08206 L atm/mol K x 273.15 K)
= 0.6245 mol
Therefore, there are 0.6245 moles of hydrogen gas present in a sample of 14.1 L at STP.
Learn more about mole ratio below.
https://brainly.com/question/30632038
#SPJ1
How many moles of sulfur are there in a 0.685−g sample of sulfur? a. 0.0214 mol b. 46.8 mol c. 22.0 mol d. 32.1 mol 23. Sodium chlorate, an ingredient in many common herbicides, has sodium, chlorine and oxygen atoms in the ratio 1:1:3, respectively. What is the formula unit for sodium chlorate? a. NaCO
3
b. SoClO
3
c. NaClO
3
d. none of these
Answers
The moles of sulfur in a 0.685g sample are (a) 0.0214 mol and the formula unit for sodium chlorate is (c) \(NaClO_3\). Thus, the correct options are A and C respectively.
To calculate the number of moles of sulfur in the given sample, we need to use the molar mass of sulfur.
The molar mass of sulfur is approximately 32.1 g/mol. Dividing the given mass (0.685 g) by the molar mass, we can determine the number of moles: (0.685 g) / (32.1 g/mol) ≈ 0.0213 mol.
Therefore, the correct answer is a) 0.0214 mol.
Moving on to the second question, we need to determine the formula unit for sodium chlorate based on the ratio of sodium, chlorine, and oxygen atoms. The ratio is given as 1:1:3, respectively.
This means that for each sodium atom, we have one chlorine atom and three oxygen atoms. The correct formula unit for this compound, following the given ratio, is c) \(NaClO_3\).
In conclusion, the moles of sulfur in a 0.685g sample are (a) 0.0214 mol and the formula unit for sodium chlorate is (c) \(NaClO_3\). Thus, the correct options are A and C respectively.
Learn more about moles here: brainly.com/question/29367909
#SPJ11
How does the ionic radius and atomic radius of an element compare
Answers
Answer:
The ionic radius is the the distance from the nucleus to the outermost electrons in a ion. While the atomic radius is the distance from the nucleus to the normal valence electrons.The ionic radius is half the distance between two gas atoms that are just touching each other. If the atom loses its outermost electron (positively charged or cation), the ionic radius is smaller than the atomic radius because the atom loses an electron energy shell.
Explanation:
consider the postulates of molecular orbital theory. which of the following is not one of those postulates? atomic orbitals must be of similar orientation to form a molecular orbital. a maximum of two electrons, with paired spins, can be placed in each molecular orbital. bonding orbitals promote the formation of the molecule. atomic orbitals of similar size can mix to form molecular orbitals. mixing of atomic orbitals forms mostly bonding molecular orbitals.
Answers
The postulates of molecular orbital theory and identify which statement is not one of those postulates. Here's the answer:
The statement that is not one of the postulates of molecular orbital theory is: "mixing of atomic orbitals forms mostly bonding molecular orbitals."
The other statements are consistent with the molecular orbital theory:
1. Atomic orbitals must be of similar orientation to form a molecular orbital.
2. A maximum of two electrons, with paired spins, can be placed in each molecular orbital.
3. Bonding orbitals promote the formation of the molecule.
4. Atomic orbitals of similar size can mix to form molecular orbitals.
To know more about the molecular orbital theory refer here :
https://brainly.com/question/29642622#
#SPJ11
Which reaction would cause a decrease in entropy?
A. 2NOCI(9) + 2NO(g) + Cl2(9)
B. 2NH3(9) ► N2(g) + 3H2(9)
C. 2CC14(9) + O2(g) → 2C0C12(g) + 2Cl2(9)
D. CO(g) + 3H2(g) → CH4(9) + H20(9)
Answers
2NOCI(9) + 2NO(g) + Cl2(9) shows decrease in entropy.
What is Entropy?Entropy in thermodynamic refers to the degrees that represent the absence of system's thermal energy that is not available to perform mechanical work, which is the degree of disorder or randomness in the system.
Therefore, 2NOCI(9) + 2NO(g) + Cl2(9) shows ddecrease in entropy because it shows degree of disorderliness is low
Learn more about entropy below.
https://brainly.com/question/6364271
Cho 8,3 gam hỗn hợp gồm al và fe tác dụng hoàn toàn với dung dịch h2so4 loãng dư , thu được 5,6 lít khí h2 ở điều kiện tiêu chuẩn . tính phần trăm khối lượng các kim loại trong hỗn hợp ban đầu
Answers
Select the statements below that are true when an ice cube is placed in a glass of hot water.Choose one or more:DA qice qwater=B. qwater = -qiceOC. The energy gained by the ice cube will be equal to the energy lost by the water.D. Thermal energy will flow from the ice cube to the water.OE. The energy lost by the ice cube will be equal to the energy gained by the water.F. Thermal energy will be transferred from the water to the ice cube.
Answers
In this question, we have a situation where an ice cube is placed in a glass of hot water, which means we have a situation of exothermic and endothermic reactions occurring.
The endothermic reaction will be related to the ice cube, since this cube will increase its temperature, and in order to do that, the cube needs to absorb energy, and this thermal energy will come from the hot water
The exothermic reaction is the hot water releasing this thermal energy to its surroundings, and then the temperature will decrease as well
The options that are the answers will be:
C
F
Letter B should be the opposite, -qwater = qice, and letter A doesn't show the positive or negative sign
the mass of sample X is 20.0g. it was placed in a graduated cylinder and the water level rose from A to B. what is the density of sample X? pay close attention to significant figures
Answers
Answer: 4.0 g/mL
Explanation:
The volume increased by 5.0 mL. Recall that the number of significant figures is equal to the number of certain values you can read plus one. Here, the volume increased from 14.0 mL to 19.0 mL, so the volume of X is 5.0 mL.
Temperature (average kinetic energy) affects the density of a substance.
True
False
Answers
Answer:
True
Explanation:
Higher temperature will have greater volumes so the density will be less.
what is the purpose of the lab ? PLSSS HELPPPPP
Answers
Answer:
To keep apparatus, chemicals and carry out experiments
Which two energy sources were used the most in
California in 2016? How do these sources compare to other sources
Answers
Answer:
The 1st and 2nd ones on the top
Explanation:
Hope this helps:)
8. Which are types of systems? (Choose all that apply)
Isolated system
Closed system
Open system
Shared system
Answers
Answer:
Closed SystemOpen SystemIsolated SystemExplanation:
In thermodynamics, there are three types of systems and they include:
The closedThe open And the Isolated systemThe closed system is capable of exchanging only energy within its surroundings.
An open system is capable of exchanging both energy and matter within its surroundings.
While an isolated system cannot exchange either matter or energy within its surroundings.
There is nothing like a shared system in thermodynamics.
The industrial solvent carbon disulfide (CS2) is produced when coke (C) and sulfur dioxide (SO2) react. If 8.00 g of SO2 reacts, how many moles of CS2 are formed?
Answers
Answer:
0.0624 mol
Explanation:
Trust me i know :)
The statement, that describes moles of CS2 are formed in the reaction is "0.0624 mol."
What is reaction?In a chemical reaction, one or several substances also referred to as reactants are changed into one or several additional compounds are recognized as products.
What is a mole?A mole is the proportion of chemical substance which comprises the number of entities such as atoms, molecules, ions etc. In order to determine the moles, divide the given mass of the substance value by its molar mass to convert grams into moles.
Gram to mole conversion factor,
\(= Grams\;*\;\frac{1\;mol}{gram}= 8.00\;g\;*\;\frac{1\;mol}{64.066 g}\\= 0.1248\;mol\)
The balanced chemical equation comes out to be, 5C + 2SO → CS₂ + 4CO
Using the above equation, moles of carbon disulfide is calculated as follows,
\(= 0.1248\;mol\;of\;SO2\;*\;\frac{1\;mol\;CS2}{2\;mol\;SO2} \\\\= 0.0624\;mol\;CS2\)
Hence the correct answer is 0.0624 mol.
Learn more about mole here
https://brainly.com/question/26416088
#SPJ2
which of the following changes different colours in alkalis,acids,and neutral substances?
A red litmus paper
B Blue litmus paper
C universal indicator
D all of the above
Answers
acids and bases of NaOH
Answers
NaOH (sodium hydroxide) is a strong base that readily dissociates in water to produce hydroxide ions (OH-) and sodium ions (Na+). In aqueous solutions, NaOH dissociates completely, making it a strong base with a high pH.
NaOH can neutralize acids, such as hydrochloric acid (HCl), sulfuric acid (H2SO4), and nitric acid (HNO3), by reacting with them to produce water (H2O) and a salt. This reaction is called an acid-base neutralization reaction, and it occurs when the hydroxide ions from the NaOH react with the hydrogen ions (H+) from the acid.
In summary, NaOH is a strong base that produces hydroxide ions when dissolved in water. It can neutralize acids by reacting with them to produce water and a salt.
To know more about strong base, visit:
https://brainly.com/question/16749233
#SPJ1
Which phrase best describes a scientists?
Answers
Answer:
They are helpers of the world who find out about the natural world and try to explain what they have observed.
Explanation:
Which is the correct chemical formula for Pentacarbon Tetraphosphide
Answers
Answer:
C5P4
Explanation:
the answer is C5P4 because penta is 5 and tetra is 4
which of the following statements regarding exergonic reactions are true? multiple select question. exergonic reactions are spontaneous. exergonic reactions have a positive change in free energy. exergonic reactions release energy during product formation. the products of an exergonic reaction have a higher free energy than the reactants.
Answers
Exergonic reactions release energy during product formation.
What are exergonic reactions?Exergonic reactions are chemical reactions that release energy as they occur. In an exergonic reaction, the reactants contain more potential energy than the products, and the excess energy is released into the environment.
Exergonic reactions are important in many biological processes, such as cellular respiration, where energy is released from the breakdown of glucose to power the cell's activities.
Learn more about exergonic reactions:https://brainly.com/question/11064909
#SPJ1