Answers
Answer:
b north to south
Explanation:
Related Questions
In a presentation about measuring mass, one of your classmates states, "Two objects of the same size will always have the same mass.” Is this statement correct? Why or why not?
Answers
Answer:
The statement is not correct.
Explanation:
If two objects have the same mass, their respective densities determine their volumes. By definition, density = mass/volume or volume = mass/density. Therefore if two objects have the same mass, the mode dense object (with higher density) will occupy less volume than the other object.
Every carbon atom in the organic molecules that make up your body MUST recently have been part of...A. a decomposer.B. a higher-level consumer.C. a producer.D. a primary consumer.E. a sugar molecule made in one of your chloroplasts.
Answers
The correct option is option c - a producer. Every carbon atom in the organic molecules that make up your body must recently have been part of a producer.
Plants and other organisms which are photosynthetic are commonly called as producers. They can use energy from sun and convert inorganic carbon into organic molecules.
Inorganic carbon usually will be in the form of carbon dioxide. The converted organic molecules will be sugars. Sugars can be used as food by other organisms.
The organic molecules later pass through various levels of consumers. Primary consumers are herbivores and higher-level consumers are carnivores and also decomposers. Decomposers will break down organic matter and release carbon back into the environment.
Later this carbon can be taken up by producers once again. Like that it will complete the carbon-cycle.
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The nucleus is the part of the atom that
Select one:
O a. has a negative charge
O b. contains most of the atom's total mass
Ос. consists mostly of empty space
O d. occupies most of the atom's total volume
Answers
Answer:
b
Explanation:
the nucleus has an overall positive charge, the electron orbital consists of empty space, while the nucleus consists of neutrons and protons tightly packed together. The electron cloud occupies most of the total volume
5) To check the accuracy of our results we will compare our results to the label on the vinegar bottle. The bottle contains 4% vinegar. We will need to change our M results to %% in order to calculate a percent error.
Using the average M and the average volume (you have to change it to LITERS) of the acetic acid find the # of moles of acetic acid using the molarity formula from Table T.
Change moles to grams using the gfm of acetic acid (HC,H,O,).
Divide grams of acetic acid by the average volume (this time in ml.) of acetic acid and then multiply by 100. This is your experimental %.
Calculate the % error.
6. What other indicator could we have used?
7. What adjustment to our calculations would we have needed to make if we used barium hydroxide rather than sodium hydroxide? (It might be helpful to write the formula for barium hydroxide
Answers
5) Convert molarity to percent, calculate moles of acetic acid, convert moles to grams, divide grams by volume in mL, multiply by 100 to obtain experimental percent, and calculate percent error.
6) Phenolphthalein could have been used as an alternative indicator.
7) When using barium hydroxide instead of sodium hydroxide, adjust the calculations by considering the stoichiometry of the reaction and using a molar ratio of 2:1 between acetic acid and barium hydroxide.
5. To calculate the percent error in the concentration of acetic acid, we need to convert our molarity (M) results to percent (%). Using the average molarity and the average volume (converted to liters) of acetic acid, we can calculate the number of moles of acetic acid.
Then, by converting moles to grams using the molar mass of acetic acid (CH3COOH), we can divide the grams of acetic acid by the average volume (in milliliters) of acetic acid and multiply by 100 to obtain the experimental percent.
Finally, we can calculate the percent error by comparing the experimental percent to the labeled percent (4% vinegar on the bottle).
6. An alternative indicator that could have been used is phenolphthalein. Phenolphthalein is commonly used in acid-base titrations and changes color in a specific pH range, indicating the endpoint of the reaction.
6. If barium hydroxide (Ba(OH)2) were used instead of sodium hydroxide (NaOH), the adjustment in calculations would involve the stoichiometry of the reaction. The balanced chemical equation for the reaction between acetic acid and barium hydroxide is:
2CH3COOH + Ba(OH)2 → Ba(CH3COO)2 + 2H2O
The molar ratio between acetic acid and barium hydroxide is 2:1. Therefore, the number of moles of barium hydroxide used would be half the number of moles of acetic acid in the calculation.
The rest of the procedure, including converting moles to grams and calculating the percent, would remain the same.
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PLEASE PLEASE HELP CHEMISTRY
Sulfur (2.56 grams) was burned in a calorimeter with excess 02(g) . The temperature increased from 21.25C to 26.72C. The bomb had a heat capacity of 923 J/C, and the calorimeter contained 815 grams of water
Calculate the heat evolved as the sulfur burned:
Calculate the heat per mole of SO2 formed in the course of the reaction
S(s) + O2 (g) SO2 (g)
Answers
The formation of which product(s) will most likely be observed in a combustion reaction?
an oxide
one element and one compound
an element
two ionic compounds
Answers
Answer:
an oxide
Explanation:
A just took the quiz on edg
The formation of oxide as product will most likely be observed in a combustion reaction.
What is combustion reaction?A combustion reaction was a reaction where a substance combines with oxygen gas to produce energy in term of light as well as heat.
What is oxide?Chemical compounds called oxides include one or even more oxygen atoms including another element.
When propane is burned in the air, carbon dioxide, as well as water, is produced.
Therefore, the correct answer will be option (A).
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Based on electronegativity values, which type of elements tends to have the greatest attraction for electrons in a bond?.
Answers
Based on electronegativity values, Fluorine (nonmetals) type elements tend to have the greatest attraction for electrons in a bond.
Electronegativity is the degree of an atom's capacity to attract shared electrons to itself. On the periodic desk, electronegativity generally increases as you move from left to right across a period and decreases as you flow down a collection.
The degree to which an atom draws electrons in a chemical bond is defined by electronegativity. If the distinction in electronegativity is more than 1.7, the individual of the bond might be ionic. If the distinction in electronegativity is among zero.
The larger the distinction in electronegativity among the two atoms, the more polar the bond. To be considered a polar bond, the distinction in electronegativity should be>zero.
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PLEASE ANSWER:
When 5.00 grams of ammonium chloride, NH4Cl, is added to 100. mL of water the temperature drops by 4.2°C, how much would the temperature change if 10.0 grams is added to 1000 mL of water?
Answers
If 10.0 grams of ammonium chloride is added to 1000 mL of water, the temperature would drop by 20.9°C.
What takes place when aluminium and chloride interact?At normal temperature, aluminium and chlorine do not react quickly, but when heated, the reaction is ferocious. Aluminum chloride, a white powder that emits fumes into the atmosphere and reacts with water to produce aluminium oxide and HCl gas, is the end product.
q = m × c × ΔT
Since the water is the solvent in this case, we can assume that the specific heat capacity of the solution is the same as the specific heat capacity of water (4.184 J/g·°C).
m = 5.00 g
ΔT = -4.2°C
q = m × c × ΔT
q = (5.00 g) × (4.184 J/g·°C) × (-4.2°C)
q = -879.36 J
Now, we can use the amount of heat released by the 5.00 grams of ammonium chloride to find the temperature change for 10.0 grams of ammonium chloride in 1000 mL of water:
m = 10.0 g
V = 1000 mL = 1000 g (since 1 mL of water has a mass of 1 g)
q = -879.36 J (from the first part)
We can solve for ΔT:
q = m × c × ΔT
ΔT = q / (m × c)
ΔT = (-879.36 J) / (10.0 g × 4.184 J/g·°C)
ΔT = -20.9°C
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Which tool gives scientists information about the wind speed and humidity of a region?
Answers
Answer:
A weather station
Explanation:
A weather station measures the wind speed and humidity of a specific area. GIS gives visual data that scientists can analyze, GPS gives the exact location of a weather phenomenon, and a hammer and lens allow scientists to study Earth’s geologic features.
PLEASE HELP!
The chemical reaction shown is exothermic.
CH4 + N2 + H2 → CH3N + NH3
Which statement about the reaction is correct?
(1 point)
Responses
Each reactant has more chemical potential energy than each product.
Each reactant has more chemical potential energy than each product.
It takes more energy to form C–H bonds in the reactants than is released from C–H bonds in the products.
It takes more energy to form C–H bonds in the reactants than is released from C–H bonds in the products.
The total chemical potential energy of the reactants is greater than the total chemical potential energy of the products.
The total chemical potential energy of the reactants is greater than the total chemical potential energy of the products.
More chemical potential energy is stored in the bonds of CH4 than in the bonds of CH3N.
Answers
Exothermic reactions, release exceeding chemical energy from the reactants. Before its release, the energy is turned into another form, heat or light. C) The total chemical potential energy of the reactants is greater than the total chemical potential energy of the products.
What is an exothermic reaction?An exothermic reaction is the chemical reaction that releases energy as heat or light when the reactants turn into products.
Reactant molecules have more energy than the product molecules, and hence, the remaining energy must leave the system. So part of the chemical energy from the reactants is released as another type of energy (heat or light).
Usually, oxidation reactions are exothermic.
The correct option is C) The total chemical potential energy of the reactants is greater than the total chemical potential energy of the products.
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327 mL of 3.2 M HCl can be diluted to make mL of 2 M HCI.
Answers
Answer:
204,375 mL.
Explanation:
327 mL - 3.2 M
x mL - 2 M
x= (2 M x 327 mL) /3.2 M
x= 204,375 mL.
What is 1 mole of CO2?
Answers
1 mole of CO2 is 6.022 x 10^23 molecules of CO2. It is also 44.01 g of CO2. Here 44.01 g comes as the sum of individual atoms of CO2 i.e. 12.01 + 16 + 16 i.e. 44.01 g
CO2 is composed of one carbon atom and two oxygen atoms, which have the atomic masses of 12.01 g/mol and 16.00 g/mol respectively. So, the molar mass of CO2 is the sum of the atomic masses of the atoms that make up CO2, which is 12.01 + 16.00 + 16.00 = 44.01 g/mol. Carbon dioxide (CO2) is a naturally occurring compound made up of one carbon atom and two oxygen atoms. It is a colorless, odorless gas and is a byproduct of many biological and industrial processes. CO2 is a greenhouse gas, which means it helps trap heat in the Earth's atmosphere and contributes to global warming.
Therefore, one mole of CO2 weighs 44.01 grams.
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ch 17 for a certain reaction Delta H = -255 Kj and Delta S rxn is 211 Kj. calculate Delta G at 55 C.
a. 11.9 3
b. 69.5 3
c. -267
d. -324
Answers
For a certain reaction, the delta G value is -324.
How to calculate the delta G value of a reaction?Hi! To calculate Delta G for the reaction at 55°C using the given Delta H and Delta S values, follow these steps:
1. Convert the temperature from Celsius to Kelvin: 55°C + 273.15 = 328.15 K.
2. Use the Gibbs free energy equation: ΔG = ΔH - TΔS, where ΔG is the change in Gibbs free energy, ΔH is the change in enthalpy, T is the temperature in Kelvin, and ΔS is the change in entropy.
3. Plug in the values: ΔG = -255 kJ - (328.15 K * 0.211 kJ/K), as ΔS is given in kJ, not J.
Calculating ΔG:
ΔG = -255 kJ - (328.15 K * 0.211 kJ/K) ≈ -255 kJ - 69.24 kJ ≈ -324.24 kJ.
So, the closest answer is:
d. -324
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If 20g of caco2 and 25g of Hcl are mixed ,what mass of Co2 is produced ?
Answers
Approximately 8.79 grams of CO₂ are produced when 20 grams of CaCO₃ and 25 grams of HCl are mixed.
The balanced chemical equation for the reaction between calcium carbonate (CaCO₃) and hydrochloric acid (HCl) is:
CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O
From the equation, we can see that 1 mole of CaCO₃ reacts with 2 moles of HCl to produce 1 mole of CO₂. The molar mass of CaCO₃ is 100.09 g/mol, and the molar mass of HCl is 36.46 g/mol.
To find the mass of CO₂ produced, we need to determine which reactant is limiting. This can be done by calculating the number of moles of each reactant and comparing them to the stoichiometric ratio in the balanced equation.
Number of moles of CaCO₃ = 20 g / 100.09 g/mol = 0.1998 mol
Number of moles of HCl = 25 g / 36.46 g/mol = 0.685 mol
According to the balanced equation, 1 mole of CaCO₃ reacts with 2 moles of HCl. Therefore, the limiting reactant is CaCO₃, since only 0.1998 moles of CaCO₃ are available to react with HCl.
From the balanced equation, we know that 1 mole of CaCO₃ produces 1 mole of CO₂. Therefore, the number of moles of CO₂ produced is also 0.1998 mol.
The molar mass of CO₂ is 44.01 g/mol. Therefore, the mass of CO₂ produced is:
Mass of CO= 0.1998 mol x 44.01 g/mol = 8.79 g
Therefore, approximately 8.79 grams of CO₂ are produced when 20 grams of CaCO₃ and 25 grams of HCl are mixed.
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a Copper li) carbonate was strongly heated until no further change state what was observed
Answers
a solution is prepared by dissolving 15.0 g of nh3 in 250.0 g of water. the density of the resulting solution is 0.974 g/ml. what is the mole fraction of nh3 in the solution?
Answers
The mole fraction of NH3 in the solution prepared by dissolving 15.0 g of nh3 in 250.0 g of water is 0.0597.
To find the mole fraction of NH3 in the solution, we need to first calculate the moles of NH3 and water in the solution.
The moles of NH3 can be found by dividing the mass of NH3 by its molar mass:
moles of NH3 = 15.0 g / 17.03 g/mol = 0.881 mol
The moles of water can be found by dividing the mass of water by its molar mass:
moles of water = 250.0 g / 18.02 g/mol = 13.874 mol
The total moles of solute and solvent in the solution are:
total moles = moles of NH3 + moles of water = 0.881 mol + 13.874 mol = 14.755 mol
The mole fraction of NH3 can now be calculated as the ratio of moles of NH3 to total moles:
mole fraction of NH3 = moles of NH3 / total moles = 0.881 mol / 14.755 mol = 0.0597
Therefore, the mole fraction of NH3 in the solution is 0.0597.
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If an electron is released during radioactive decay which type of Decay has taken place a gamma decay b beta decay c electromagnetic decay d alpha decay
Answers
If an electron is released during radioactive decay, the type of decay that has taken place is beta decay.
In beta decay, a neutron within the nucleus is converted into a proton, releasing an electron (also called a beta particle) in the process.
In alpha decay an alpha particle is emitted from the atomic nucleus and a new atomic nucleus is formed. So, no release of electron is there.
In gamma decay the unstable nuclei release excess energy by continuous electromagnetic process. This does not involve release of electron.
The electromagnetic decay also do not involve the release of an electron.
Thus option b is the correct answer.
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What is the pH at the half-equivalence point in the titration of a weak base with a strong acid? The pKb of the weak base is 7.95.
a. 7.95
b. 8.75
c. 6.05
d. 5.25
Answers
Titration is the process of determining the amount of a substance in a solution by measuring the volume of a solution with a known concentration that is required to react with it. The answer to the given question is option d) 5.25.
In the titration of a weak base with a strong acid, the pH at the half-equivalence point can be calculated as follows: At the half-equivalence point, we have equal moles of the weak base and the strong acid. As a result, we get a solution that contains the weak base, its conjugate acid, and water. In the solution, there is an equilibrium between the weak base and its conjugate acid. This equilibrium has an acid dissociation constant, Ka. It's given by:
Ka = [H+][A–]/[HA]
The pKa is calculated by taking the negative logarithm of Ka:
pKa = -log(Ka)
At the half-equivalence point, [HA] = [A–] and the expression for pKa becomes:
pKa = -log([H+])
Therefore, the pH at the half-equivalence point is:
pH = 1/2 (pKb + pKa)
Given that pKb = 7.95 for the weak base, we can calculate the pKa:
pKw = 14 (at 25°C)
pKw = pKa + pKb
14 = pKa + 7.95
pKa = 6.05
Therefore, the pH at the half-equivalence point is:
pH = 1/2 (7.95 + 6.05)
pH = 1/2 (14)
pH = 7
At the half-equivalence point, the pH of the solution is equal to 7. Therefore, option d) 5.25 is incorrect.
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Some salts isolated by evaporation retain water that is called?
Answers
The water retained by some salts when isolated by evaporation is called water of hydration. Salts that contain water of hydration are called hydrates.
Water of hydration is also called water of crystallization. It is the water that remains inside the framework of the salt or crystal after evaporation and can only be removed by heating, but by doing this, one risks losing the structure of the crystal.
An example of a hydrate is copper tetraoxosulphate (VI). When hydrated, it becomes copper tetraoxosulphate (VI) pentahydrate. When it is without its water of hydration, it has a white colour but when it is hydrated, it is blue in colour.
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The products of __________ combustion are carbon monoxide, carbon and water. what one word completes this sentence?
Answers
Answer:
Complete combustion
Explanation:
To solve such this we must know the concept of combustion reaction. Therefore the products of complete combustion are carbon monoxide, carbon and water.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved.
There are so many types of chemical reaction reaction like combustion reaction, acid base reaction, double displacement reaction, combustion reactions. The products of complete combustion are carbon monoxide, carbon and water. Large amount of heat is also released in combustion reaction
Therefore the products of complete combustion are carbon monoxide, carbon and water.
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a reducing chemical reaction . group of answer choices reduces the compound to a simpler form adds an electron to the substrate removes a hydrogen atom from the substrate is a catabolic reaction
Answers
A reducing chemical reaction adds an electron to the substrate.
Reduction is a term used to describe the yield of electrons, the accumulation of hydrogen, or the reduction of oxygen from the substrate.
When a reactant accumulates electrons during a reaction, it is called reduction. Reduction reactions include the addition of electrons to a substrate and the donor of the electrons is a reducing agent that itself brings oxidization. Therefore a reducing chemical reaction retains the addition of electrons to a substrate.
Oxidation-reduction (redox) reactions consist of the transfer of electrons between compounds while catabolic reactions are the type of reactions in which complex substances are split down into simpler units with the discharge of energy. Therefore these options are incorrect
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What keeps a satellite in orbit around Earth?
A.
Earth’s gravity
B.
Earth’s atmosphere
C.
Earth’s solar system
D.
Earth’s magnetic field
Answers
Answer:
I think its A. Earths gravity
Explanation:
Hope this answer helps!
After a hurricane, plant A began to do poorly and plant B began to thrive. After several large rainstorms, plant A began to thrive and plant B began to do poorly. What hypothesis is best supported by this information?
Answers
Answer:Plant A does best in high salinity water and soil, and plant B does best in low salinity water and soil.
Explanation: Because plant A in a hurricane dost bad bot Plant B doest well
Answer:
Plant A does best in high salinity water and soil, and plant B does best in low salinity water and soil
Explanation:
This is due to hurricanes decreasing salinity of water while Rainstorms increase salinity.
Someone please answer quick.
How many molecules are in 5.5 mol of a ZnCL2 sample
Answers
Answer:
The answer is 136.286.
mr cleann
Can anyone help me on this please.
Answers
In the basketball experiment, what does
the different materials represent?
Control variable?
dependent variable?
independent variable?
Answers
all ionic compounds become electrolytes when thrown into water true or false
Answers
True. When ionic compounds are dissolved or thrown into water, they typically dissociate into ions and become electrolytes.
An electrolyte is a substance that conducts electric current when dissolved in water or molten form due to the presence of freely moving ions. Ionic compounds consist of positively charged cations and negatively charged anions held together by electrostatic forces. When they come into contact with water, the water molecules surround the ions and weaken the forces holding them together, causing the compound to dissociate into its constituent ions. These ions are then free to move in the aqueous solution and carry electric charge, allowing the solution to conduct electricity. Therefore, most ionic compounds can be considered electrolytes when dissolved in water.
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Which substance is a reactant(s)
O2 only
MgO only
Mg and O2
Mg only
Answers
Which of the following is the correct electron dot formula for ethane C2H6 one of the components of natural gas
Answers
Answer:
D
Explanation:
1. You need to calculate the number of carbons and hydrogens in the molecules.
2. Does the atoms achieve an octet in the molecule?
An acid can be defined as a substance that loses one or more H+ ions when dissolved in water. An H+ ion is a hydrogen atom that has lost a(n) ____ and is therefore just a(n) ______. The H+ ion is not an isolated ion, but interacts strongly with H2O to produce _____ ion, which has the formula H3O+
Answers
An acid can be defined as a substance that loses one or more H+ ions when dissolved in water. An H+ ion is a hydrogen atom that has lost an electron and is therefore just a proton. The H+ ion is not an isolated ion but interacts strongly with H2O to produce hydronium ion, which has the formula H3O+
An acid can be defined as a substance that loses one or more H+ ions when dissolved in water. An H+ ion is a hydrogen atom that has lost an electron and is therefore just a proton. The H+ ion is not an isolated ion but interacts strongly with H2O to produce hydronium ion, which has the formula H3O+.Hydronium ion (H3O+) is the product when a proton (H+) is transferred to a water molecule (H2O).
The H+ ion interacts with the lone pair of electrons on the oxygen atom of the water molecule to form a hydronium ion. The resulting hydronium ion has a tetrahedral molecular geometry, with the oxygen atom at the center and the three hydrogen atoms at the corners. The presence of hydronium ions is what gives acidic solutions their characteristic sour taste and ability to conduct electricity.
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