The statement that is true about magnets is ''Similar poles of a magnet repel each other.''
What are the characteristics of magnet?All magnets have both north and south poles. Opposite poles attract each other, whereas the similar poles repel each other. When you rub a piece of iron along a magnet, this force creates a magnetic field.
So we can conclude that The statement that is true about magnets is ''Similar poles of a magnet repel each other.''
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The parent element 42 19 K decays by beta decay. Which daughter element will
form?
O A. Ca
OB. 1 Ar
O C. C
OD. K
Answer: A
Explanation:
This means that the atomic number decreases by 1 but the mass remains constant, meaning the atomic number of the new element is 20. This corresponds to calcium.
ASAP PLS 100 POINTS Which statement best describes the role of oxygen in cellular respiration?
A. Oxygen molecules are a waste product of electron flow.
OB. Oxygen molecules form as ATP molecules are made.
OC. Oxygen molecules form as sugar molecules are broken down.
OD. Oxygen molecules are used to make water molecules.
Answer:
Option C
Explanation:
Oxygen molecules form as sugar molecules are broken down.
Sugar or carbohydrates are known as glucose or sucrose and malltose i.e C6H12O6 etc.
So they are broken down by cellular respiration and forms Oxygen for cells
20.0 g of bromic acid, HBrO3, is reacted with excess HBr.
HBrO3 (aq) + 5 HBr (aq) → 3 H2O (l) + 3 Br2 (aq)
If 47.3 g of Br2 is produced, what is the percentage yield of Br2? Round your answer to the nearest whole percent.
After Rounding off The percentage yield is 64%
What is Percentage Yield ?It is the ratio of actual yield to theoretical yield multiplied by 100% .
It is given in the question
20.0 g of bromic acid, HBrO3, is reacted with excess HBr.
The reaction is
HBrO₃ (aq) + 5 HBr (aq) → 3 H₂O (l) + 3 Br₂ (aq)
Actual yield = 47.3 grams
Molecular weight of Bromic Acid is 128.91 gram
Moles of Bromic Acid = 20/128.91 = 0.155 mole
Mole fraction ratio of Bromic Acid to Bromine is 1 :3
Therefore for 0.155 mole of Bromic Acid 3 * 0.155 = 0.465 mole of Bromine is produced.
1 mole of Bromine = 159.8 grams of Bromine
0.465 of Bromine = 74.31 grams of Bromine
Percentage Yield = (47.3/74.31)*100 = 63.65 %
After Rounding off The percentage yield is 64% .
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A high temperature reaction vessel is charged with 0.5860 mol of iron powder and 35.1 L of oxygen gas at standard temperature pressure. On heating, the iron and oxygen react according to the balanced reaction below.
4Fe(s) + 3O2(g) ®️ 2Fe2O3(s)
After the reaction vessel is called, and assuming the reaction goes to completion, what volume of oxygen remains?
Answer: 25.1195 L
Explanation:
Given:
There are 0.5860 mol of Iron powder (Fe)
The volume of oxygen gas at STP is 31.5 L
The volume filled by a gas at STP is approximately 22.71 L
Therefore, the moles of oxygen gas at STP = Volume of oxygen gas at STP/ 22.71
= 35.1/22.71
= 1.5456 mol
The balanced chemical equation given for this reaction is:
4Fe(s) + 3O2 (g) ----> 2Fe2O3 (s)
Dividing the above equation by 2, yields:
2Fe(s) + 3/2O2(g) -------> Fe2O3 (s)
From the equation we see:
2 moles of Fe reacts with 3/2 mole of O2 to give one mole of Fe2O3
Thus, let x moles of O2 react with 0.5860 moles of Fe
0.5860/2=x/3/2
0.5860*3=4*x
x = 1.758/4
x =0.4395 mol
So the remaining moles of oxygen gas = 1.5456 - 0.4395
= 1.1061 mol
Therefore, the amount of oxygen gas, in litres, remaining is = 1.1061*22.71
= 25.1195 L
Which of the following stores chemical energy?
A. the bonds of a molecule
B. the nucleus of an atom
C. the density of a substance
D. the temperature of a substance
Answer:
A: The bonds of a Molecule
Explanation:
A chemical reaction can be reversed if?
Question 18 options:
The energy of the products is less than the activation energy threshold.
The energy of the products exceeds the activation energy threshold.
The energy of the reactants exceeds the activation energy threshold.
The energy of the reactants is less than the activation energy threshold.
A chemical reaction can be reversed if the energy of the products exceeds the activation energy threshold.
What are reversible reactions?Reversible reactions are reactions which can proceed in two directions.
In reversible reactions, reactants can form products and products can also break down to form reactants.
For a chemical reaction to be reversed, the original reaction conditions leading to formation of products are reversed.
Therefore, a chemical reaction can be reversed if the energy of the products exceeds the activation energy threshold.
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Question 17 of 30
For a reaction, AH = -286 kJ. When is the reaction spontaneous?
A. When TAS> 0
B. When TA S= -286 kJ
C. When TAS<-286 kJ
D. When TAS = 2(-286 kJ)
The reaction is spontaneous when TΔS is greater than zero (TΔS>0).
Spontaneous reactionA spontaneous reaction is determined by applying Gib's free energy formula as follows;
ΔG = ΔH - TΔS
A reaction is spontaneous when Gib's free energy is negative.
For the given example, the change in enthalpy is negative (-286 kJ), to obtain a negative Gib's free energy, the entropy must be positive.
Thus, the reaction is spontaneous when TΔS is greater than zero (TΔS>0).
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Which of these is a benefit of including comments in your code
makes the app run faster
O helps other programmers understand your code
O improves the user interface
O makes your app more user friendly
A benefit of including comments in your code is that it helps other programmers understand your code.
What is a Code?These are numbers and letters which are used to identify a particular thing at a point in time.
Comments can be put in a code so as to enable others know and understand real intentions about it etc.
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Answer: O helps other programmers understand your code
Explanation: got it right on edgen
What is known about a reaction with a positive enthalpy?
A. Heat is given off as a product of the reaction.
B. The reaction has a large activation energy.
OC. Heat is required to make the reaction occur.
OD. The reaction will never be spontaneous.
Answer: C
Explanation:
In endothermic reactions, enthalpy is positive, and in exothermic reactions, enthalpy is negative, So, if enthalpy is positive, then it is an endothermic reaction, and hence is required for the reaction to occur.
Calculate the number of moles of hydrogen chloride produced from 10 moles
of hydrogen.
H₂(g) + Cl₂(g) → 2HCl(g)?
Answer:
20 moles HCl
Explanation:
To find the final answer, you need to use the mole-to-mole ratio (from the equation) to convert from moles H₂ to moles HCl. Make sure to arrange the ratios in a way that allows for the units of H₂ to cancel out.
1 H₂ (g) + Cl₂ (g) --> 2 HCl (g)
10 moles H₂ 2 moles HCl
------------------- x --------------------- = 20 moles HCl
1 mole H₂
2 HCl (g)
H2 (8)
Cl2 (8)
Is the model a correct representation of a chemical reaction taking place?
No, a chemical reaction always has more products than reactants.
Yes, the model shows atoms rearranging to produce a new compound.
No, a chemical reaction always produces more complex compounds.
Yes, the model shows atoms changing states of matter to form a product.
Yes. The model represents atoms rearranging to produce a new compound.
What chemical reactions?They are reactions involving the breakage of bonds and rearrangement of atoms in reactants to form products.
In the model, the bonds between hydrogen and chlorine were broken. Thereafter, each hydrogen and chlorine molecule linked up to form hydrogen chloride.
Thus, the model shows atoms rearranging to produce a new compound.
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For an atom electrons, how many energy sublevels are present in the principal energy level n = 4?
There are 4 energy sublevels are present in the principal energy level n = 4.
What is sublevels?Sub-level is a type of level that is lower than another level or it is a part or component of a big level. S, p, d and f are the four energy levels in which electrons are present.
So we can conclude that 4 energy sublevels are present in the principal energy level n = 4.
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You have now identified whether crabs are able to see plankton they eat near the ocean floor. Based on your answer, explain how this information can be used to help the Australian Institute of Marine Biology further to understand the environment of the ocean floor (what other organisms live at the bottom? How are these able to see their food/ attract food to survive?
They are able to find out more organisms which are present at the bottom of the sea due to their accomplishment.
How this information can be used to help to understand the environment of the ocean floor?This information can be used to help the Australian Institute of Marine Biology further to understand the environment of the ocean floor because they are able to see the seas floor and can find out other creatures as well.
So we can conclude that they are able to find out more organisms which are present at the bottom of the sea due to their accomplishment.
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Does a displacement reaction take place in 'magnesium + lead nitrate'? and if so why?
Answer:
Maybe or maybe not (not sure)
Explanation:
A displacement reaction is a type of reaction where one element is displaced by another from a compound.
In the case of magnesium and lead nitrate, magnesium is more reactive than lead. Therefore, it will displace lead from lead nitrate to form magnesium nitrate and lead.
The reaction can be represented as:
Mg(s) + Pb(NO3)2(aq) → Mg(NO3)2(aq) + Pb(s)
Another answer could be;
A displacement reaction does not take place in 'magnesium + lead nitrate' because magnesium is more reactive than lead.
What types of intermolecular forces are important in controlling bio-molecular structure of proteins?
- H-bonding
- Van der Waals
- Dipole Dipole
- All of the above
- None of the above
Answer:
What types of intermolecular forces are important in controlling bio-molecular structure of proteins?
hydrogen bond
option a H - bondinghope it's helpful thanks
How many moles of aluminum do 6.4×1024 aluminum atoms represent?
Answer:
11 moles Al
Explanation:
To find the amount of moles, you need to use Avogadro's number to convert the atoms to moles. Since the value you were given has 2 significant figures, the final answer should also have 2 sig figs.
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
6.4 x 10²⁴ atoms Al 1 moles
---------------------------- x ------------------------------ = 10.6 moles Al
6.022 x 10²³ atoms
= 11 moles Al
what are ways in controlling soil applicable in your community
Answer:
Some methods of controlling soil erosion.
1) Planting Vegetation. This method involves planting crops with deep roots that can hold the soil in place. ...
2)Contour Farming. ...
3)Applying Mulches. ...
4)Avoiding Overgrazing. ...
5)Reforestation. ...
6)Use Plastic Sheeting. ...
7)Applying Terraseeding Method
Which law states that at constant temperature the pressure of a given amount of gas is inversely proportional to the volume of the gas?
A.
Combined gas law
B.
Gay-Lussac’s law
C.
Charles’s law
D.
Boyle’s law
E.
Ideal gas law
Boyle’s law states that at constant temperature the pressure of a given amount of gas is inversely proportional to the volume of the gas. Hence, option D is correct.
What is Boyle’s law?The volume of a gas at a constant temperature varies inversely with the pressure exerted on it.
Boyle's law states " The pressure of a gas is inversely proportional to the volume occupied by the gas when the temperature(in kelvins) is held constant ".
[tex]P[/tex] ∝ [tex]\frac{1}{V}[/tex]
[tex]PV =CONSTANT[/tex]
This means that with an increase in the volume of gas the pressure exerted by the gas decreases or vice versa. Here variables were pressure and volume.
[tex]P[/tex] ∝ [tex]\frac{1}{V}[/tex]
Boyle’s law states that at constant temperature the pressure of a given amount of gas is inversely proportional to the volume of the gas. Hence, option D is correct.
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what is the difference between s8 and 8 s
The reaction of a quantity of sulfur trioxide with water gives an acid with a volume of 2 l, containing 1.8 mol of the dissolved oxide.
a)Calculate the mass of ammonium sulfate that would be obtained by reacting with ammonia acid.
b)Calculate the CM of the solution with a volume of 100 ml of ammonia (aq) to be added for complete neutralization of the acid solution.
Answer :]
A.)Calculate the mass of ammonium sulfate that would be obtained by reacting with ammonia acid.
Correct me if i'm wrong :]
True or False?
The same carbon atoms are used repeatedly on Earth.
Answer:
True
Explanation:
had the same question
A dunk tank hold 30,533 moles of water? How many grams of water are in the tank?
The mass of water in the tank, given the data from the question, is 549594 g
What is a mole?The mole of a substance is related to its mass and molar mass according to the following equation:
Moles =[tex]\frac{mass}{molar \;mass}[/tex]
How to determine the mass of water in the tank
From the question given above, the following data were obtained:
Mole of water = 30533 moles
Molar mass of water = 18 g/mol
Mass of water = ?
The mass of the water can be obtained as follow:
Mass = mole × molar mass
Mass of water = 30533 × 18
Mass of water = 549594 g
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Write the ion symbol for an atom with the given number of protons and electrons.
55 protons and 54 electrons
The element is identified with the number of protons, and the element with 55 protons is Cs.
Since there are 54 electrons, the overall charge is +1, so the answer is [tex]\boxed{\text{Cs}^{+}}[/tex]
The ion symbol for an atom with 55 protons and 54 electrons is [tex]Cs^+[/tex]. In chemistry, a "ion" is a term used to describe an electrically charged particle.
An electrically charged particle is referred to as a "ion" in chemistry. It can be negatively charged (referred to as an anion) or positively charged (referred to as a cation). Ions are created when there is an imbalance between the number of protons and electrons in an atom, which happens when atoms gain or lose electrons. Ions are essential in many chemical processes and are in charge of an electrolytic solution's conductivity. Electric current can flow because in solution, ions are free to travel and carry electrical charges. Ions play an important role in cellular communication and the transport of chemicals through cell membranes in biological systems.
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Potassium fluoride has a solubility of 92 g of KF in 100. g of H₂0 at 18 °C. Determine if
each of the following mixtures forms an unsaturated or saturated solution at 18 C:
a. adding 24 g of KF to 25 g of H₂O
b. adding 47 g of KF to 50. g of H₂O
c. adding 127 g of KF to 150. g of H₂O
a) In 25 grams of water, the solubility is 92/4 = 23 grams, so adding 24 grams will produce a supersaturated solution.
b) In 50 grams of water, the solubility is 92/2 = 46 grams, so adding 47 grams will produce a supersaturated solution.
c) In 150 grams of water, the solubility is 92(1.5) = 138 grams, so adding 127 grams will produce an unsaturated solution.
The picture shows two containers filled with a gas.
Which statement is correct?
The average kinetic energy of the gas particles is greater in container A because it has a lower temperature.
The average kinetic energy of the gas particles is greater in container B because it has a higher temperature.
The gas particles in both containers have the same average kinetic energy because they have the same volume.
The gas particles in both containers have the same average kinetic energy because they have equal number of particles.
Answer: The average kinetic energy of the gas particles is greater in container B because it has a higher temperature.
The diameter of a hydrogen atom is 106 pm. Find the length in kilometers of a row of 4.34 x 1023 hydrogen atoms?
The length in kilometers of a row of 4.34 x 1023 hydrogen atoms is 4.34 x 10¹⁴ km.
Length of the entire hydrogen atoms
The length of the entire hydrogen atom is calculated as follows;
Length of the row = number x diameter of one
Length of the row = 4.34 x 10²³ x 10⁶ x 10⁻¹²
Length of the row = 4.34 x 10¹⁷ m
Length of the row = 4.34 x 10¹⁴ km
Thus, the length in kilometers of a row of 4.34 x 1023 hydrogen atoms is 4.34 x 10¹⁴ km.
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i) Explain why chlorine(1) oxide has a low melting point.
Answer:
Being a covalent compound, the intermolecular forces between the Cl2O molecules are weak and easily overcome. Therefore little heat energy, in terms of low boiling point is involved.
The specific heat of aluminum is approximately
0.90 J/g °C. How much heat energy would be
required to raise the temperature of a 50 g
sample of aluminum from 20 °C to 100 °C?
Answer:
3600J
Explanation:
Q = mc∆T
= 50 x 0.9 x (100 - 20)
= 3600J
2C4H10+1302 -> 8CO2 + 10H₂O
If 2.46 g of H₂O are produced by a reaction, how many moles of H₂O are produced?
Answer:
.137 moles
Explanation:
need to know the molar mass of water which is 18.01528 g/mol
2.46 g of H₂O divided 18.01528 g/mol molar mass H₂O = moles of H₂O
2.46 divided by 18.01528 =
.137 moles
C4H10 is butane
butane is commonly used in cigarette lighters
2C4H10+1302 -> 8CO2 + 10H₂O is the burning of butane
burning butane with oxygen makes carbon dioxide and water
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8B-Zisette, Jennifer
ping
Complete the sentence to describe what a wave is and what it does.
A wave is a
that carries
from one place to another.
Answer:
Disturbance; energy.
Explanation:
A wave is a disturbance that transfers energy from one place to another without transferring matter.