Answer: true
Explanation: hope this helpes
Answer:
TRUE
Explanation:
power derived from the utilization of physical or chemical resources, especially to provide light and heat or to work machines.
Which of the following is true about the principle of the conservation of mass? *
1 point
d. The mass of the products is never equal to the mass of the reactants.
e. The mass of the products is less than the mass of the reactants.
f. The mass of the products is equal to the mass of the reactants.
g. The mass of the products is greater than the mass of the reactants.
Answer:
F
Explanation:
"The mass of the products is equal to the mass of the reactants" is true about the principle of the conservation of mass.
So, option f is correct one.
What is the principle of conservation of mass?The principle of the conservation of mass states that mass can neither be created nor be destroyed in a chemical reaction, it only transferred from reactants to products. It means that mass of reactants is equal to mass of products.Example when wood burns the mass of shoot, ashes, and gases equal to the original mass of of charcoal and oxygen when it first react.To learn more about conservation of mass here.
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quick question plz . .....Which one of the following is acidic oxide?
A. K2O
B. CO2
C. MgO
D. Al2O3
Answer:
B
Explanation:
its an acidic oxide, it disolves in water to form carbonic acid which is an acid
In the lab, a student adds 4.5 g of sodium chloride (NaCl) to 100.0 g of water. Calculate the molality of the solution.
Answer:
0.77mol/Kg.
Explanation:
The following data were obtained from the question:
Mass of NaCl = 4.5g
Mass of water = 100g.
Molality =...?
Next, we shall determine the number of mole in 4.5g of NaCl. This can be obtained as follow:
Mass of NaCl = 4g.
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
Number of mole NaCl =..?
Mole = Mass /Molar Mass
Number of mole of NaCl = 4.5/58.5
Number of mole of NaCl = 0.077 mole.
Next, we shall convert 100g of water to kilograms. This is illustrated below:
1000g = 1kg
Therefore, 100g = 100/1000 = 0.1Kg.
Finally, we can determine the molality of the solution as follow:
Molality is simply defined as the mole of solute per unit kilogram of solvent (water). Mathematically, it is represented as:
Molarity = mole of solute / kg of solvent
Mole of solute, NaCl = 0.077 mole
Kg of solvent = 0.1kg
Molality = 0.077mol/0.1kg
Molality = 0.77mol/Kg
The molarity of the solution is 0.77mol/Kg.
Calculation of the molarity of the solution:
Since
Mass of NaCl = 4.5g
Mass of water = 100g.
Here,
Mass of NaCl = 4g.
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
Now
Mole = Mass /Molar Mass
= 4.5/58.5
= 0.077 mole.
Now
1000g = 1kg
So,
100g = 100/1000 = 0.1Kg.
Now
Molarity = mole of solute / kg of solvent
Mole of solute, NaCl = 0.077 mole
Kg of solvent = 0.1kg
So,
Molality = 0.077mol/0.1kg
= 0.77mol/Kg
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An invasive fish species was accidentally introduced into a river. At first, it experienced a sudden surge in its population. Then it experienced a steady decline. Which statements give plausible reasons for this trend?
Answer:
Correct Option is Option A
A.)It became prey to certain organisms in the river.
Explanation:
CHECK COMPLETE QUESTION BELOW;
An invasive fish species was accidentally introduced into a river. At first, it experienced a sudden surge in its population. Then it experienced a steady decline. Which statements give plausible reasons for this trend?
A.It became prey to certain organisms in the river.
B.It lacked adaptations suitable for that particular ecosystem.
C.It had no predators in its new environment.
D.It had few organisms to compete with for resources.
Aquatic invasive species are species such as fish or invertebrate that is absorbed by new aquatic environment that are differ from their own natural environment.
When Aquatic invasive species found themselves in a new environment, at first they will experience a rapid increase in the number of their population this is because of the lack of natural predators in the new aquatic environment. As a result of this they bring about the alteration of food web structure, they take in charge of available food for the native species and compete with them. As a result of this competition involved there is a decrease in the population.
Therefore, the statements that gives plausible reasons for this trend is that became prey to certain organisms in the river.
Answer:
It became prey to certain organisms in the river.
It lacked adaptations suitable for that particular ecosystem.
Explanation:
Took the test on Edmentum
A weather balloon calibrated at 0.00 °C to have a volume of 20.0 L has
what volume at -40.0 °C assuming pressure is held constant?
Answer:
17.1 Liters
Explanation:
It's a gas law question (more specifically a Charles's Law question). Formula is V1/T1 = V2/T2. You're given V1 and T1 and T2. However, in order to use the equation, temperature needs to be in Kelvins (by subtracting the degrees C from 273) for the numbers to work (among other reasons, the 0 degrees C will always give you an answer of zero or undefined). Placing all temps in kelvins makes the answers come out right. So 20L/273K = xL/233K gives you the answer when you cross-multiply.
Considering the Charles's law, a weather balloon calibrated at 0.00 °C to have a volume of 20.0 L has 17.07 L at -40.0 °C, assuming pressure is held constant.
The gas laws are a set of chemical and physical laws that allow determining the behavior of gases in a closed system. The parameters evaluated in these laws are pressure, volume, temperature and moles.
Charles's law is one of the gas laws. It relates the volume and the temperature of a certain quantity of ideal gas, kept at a constant pressure.
This law states that, at constant pressure, the volume of a gas is directly proportional to its temperature. In other words, for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases, and as the temperature decreases, the volume of the gas decreases.
Mathematically, Charles's law says that the quotient that exists between the volume and the temperature will always have the same value:
[tex]\frac{V}{T}=k[/tex]
Being an initial state 1 and a final state 2, it is true:
[tex]\frac{V1}{T1}=\frac{V2}{T2}[/tex]
In this case, you know:
V1= 20 LT1= 0 C=273 KV2= ?T2= -40 C= 233 KReplacing:
[tex]\frac{20 L}{273 K}=\frac{V2}{233 K}[/tex]
Solving:
[tex]V2=233 K x\frac{20 L}{273 K}[/tex]
V2=17.07 L
Finally, a weather balloon calibrated at 0.00 °C to have a volume of 20.0 L has 17.07 L at -40.0 °C, assuming pressure is held constant.
Learn more:
https://brainly.com/question/4147359?referrer=searchResultsIdentify this molecule
Answer:
Ribose
Explanation:
This is the pentose sugar found in RNA commonly.
A solution is made by mixing 114.g of benzene C6H6 and 83.g of acetyl bromide CH3COBr. Calculate the mole fraction of benzene in this solution. Round your answer to 3 significant digits.
A solution is made by mixing 114.g of benzene C6H6 and 83.g of acetyl bromide CH3COBr, the mole fraction of benzene in this solution is 1.45mol.
What is molar mass ?The term molar mass is defined as the compound is often calculated by adding the quality atomic masses in g/mol of the constituent atoms.
Molar mass of CH3COBr,
Molar Mass = 2 × MM(C) + 3 × MM(H) + 1 × MM(O) + 1 × MM(Br)
= 122.944 g/mol
Molar mass of C6H6,
MM = 6 × MM(C) + 6 × MM(H)
= 6 × 12.01 + 6 × 1.008
= 78.108 g/mol
n(CH3COBr) = mass/molar mass
= 83 /122.944
= 0.675
n(C6H6) = mass/molar mass
= 114 / 78.108
= 1.45
n(CH3COBr),n1 = 0. 675mol
n(C6H6),n2 = 1. 45mol
Thus, the mole fraction of benzene in this solution is 1.45mol.
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Acetylene is the simplest hydrocarbon
that contains carbon-carbon triple bond.
Hydrocarbons are the compounds of
carbon and hydrogen.
identify the branch of Chemistry??
Answer:
organic chemistry
because it is study of carbon containing substances
Organic chemistry is the branch of Chemistry where hydrocarbons are the compounds of carbon and hydrogen.
What is organic chemistry?Organic chemistry is the study of the structure, properties, composition, reactions, and preparation of carbon-containing compounds.
Hydrocarbons Derivatives are compounds which are made up of hydrogen and carbon with specific functional groups attached to them.
Examples:- Aldehydes, ketones, carboxylic acids, alcohols, alkyl halides, ethers, amines etc.
Hence, organic chemistry is the branch of Chemistry where
hydrocarbons are the compounds of carbon and hydrogen.
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Which factor affects gravitational potential energy but not elastic potential energy?
Answer:
spring constant. acceleration due to gravity. distance from a given position. amount of matter in the object.
Explanation:
hope this helps you :)
Answer:
spring constant
Explanation:
How much cesium (half-life = 2 years) would remain from a 10 g sample after
4 years?
O A. Og
OB. 8g
O c. 59
O D. 29
SUBMIT
Answer: 2.5 grams
Explanation:
Expression for rate law for first order kinetics is given by:
[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant
a - x = amount left after decay process
a) to calculate the rate constant:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]
[tex]k=\frac{0.693}{2years}=0.346years^{-1}[/tex]
b) to find amount left after 4 years
[tex]4=\frac{2.303}{0.346}\log\frac{10}{a-x}[/tex]
[tex](a-x)=2.5g[/tex]
Thus 2.5 g of cesium would remain from a 10 g sample after 4 years
how can you tell from the name the types of bonds present in a hydrocarbon?
Answer:
Alkane
Alkene
Alkyne
Explanation:
Alkane=1 bond (Saturated hydrocarbon)
Alkene= 2 bonds (Unsaturated hydrocarbon)
Alkyne= triple bonds (Unsaturated hydrocarbon)
Formula of Alkane = CnH2n+2
Formula of Alkene = CnH2n
Formula of Alkyne = CnH2n-2
In the following reaction, which are the products?
Mg + 2HCl —> H2 + MgCl2
If you could, please explain as well.
Answer: H2 + MgCl2
Explanation: As they are on the right side of the equation/ are the products being made as a result of the reaction, they are the products.
⚠️SOMEONE PLEASE HELP⚠️
Which describes two phases in dynamic equilibrium?
O A. Molecules in one phase continually change to the other.
O B. The total number of molecules must be equal in each phase.
O C. Molecules do not change from one phase to the other.
O D. The total number of molecules in each phase stays constant.
Answer:
The total number of molecules in each phase stays constant
Explanation:
i just took the test and got it right.
In the dynamic equilibrium between 2 phases, the total number of molecules in each phase stays constant (Option D).
When does dynamic equilibrium occur?Dynamic equilibrium occurs when the direct and reverse rates are equal and the concentrations remain constant over time.
Which describes two phases in dynamic equilibrium?
A. Molecules in one phase continually change to the other. NO. Molecules in both phases continually change.B. The total number of molecules must be equal in each phase. NO. This is not necessarily true.C. Molecules do not change from one phase to the other. NO. This would be a static equilibrium.D. The total number of molecules in each phase stays constant. YES. Since the forward and reverse rates are equal.In the dynamic equilibrium between 2 phases, the total number of molecules in each phase stays constant (Option D).
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which substance will form a solution when mixed with liquid benzene (c6h6)
Answer: [tex]I_{2} (l)[/tex]
Explanation: Because C 6 H 6 is nonpolar substance and I 2 is also nonpolar compound
According to the concept of solubility,iodine will form a solution when mixed with liquid benzene as both are non-polar substances.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
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How marly electrons are in an atom of elemental
sodium?
Answer: 11 Electrons
Explanation:
We know that the atomic number of sodium is 11. This tells us that sodium has 11 protons and because it is neutral it has 11 electrons.
Answer:
The sodium atom is left with a full outermost electron shell with eight electrons, and the outermost shell of the other atom is full as well.
Explanation:
The sodium atom now has a positive electrical charge of plus 1, and the other atom has a negative charge of minus 1. The two opposite charges attract, and the two atoms now form the molecule of a compound.
what part of the brain helps you see and think
Answer:
Mark me brainliest
what is freshly prepared FeSO4 used in the brown ring test
Answer:
Freshly prepared ferrous sulphate is used in brown ring test, because if FeSO4 is stored or it is the old one then it reacts with atmospheric oxygen and gets oxidized to form a corrosive brown-yellow coating of basic ferric sulphate, which is an adduct of ferric oxide and ferric sulphate
HEYA FRIEND
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HERE'S YOUR ANSWER
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It is used in brown ring test because , if Fe2So4 is stored or it is old one then it reacts with atmospheric oxygen and gets oxidized to form a corrosive brown yellow coating of basic ferric sulphate , which is an adduct of ferric oxide and ferric sulphate.
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HOPE IT WILL HELP YOU UP
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KATË
-pls help will mark brainliest-
Answer:
Explanation: d
Why is there a higher rate of skin cancer in Australia than in other parts of the world?
Answer:
Read below
Explanation:
Melanoma -- the most virulent form of skin cancer -- is caused by harmful ultraviolet light from the sun. Australia's proximity to Antarctica, where there is a hole in the ozone layer that filters out UV rays, also increases the risk.
Answer:
In Austrailia there is the hieghest rate of skin cancer because there is so much sunlight in Austrailia and there some people that have sensitive skin and they get skin cancer easily/ fast.
Explanation: This answer is correct because my teacher gave me this answer.
Hope this was helpful if not plz don't report my answer plz.
Describe one way in which uranium is disposed of.
Answer:
In the oxide form, uranium can be disposed of as low-level radioactive waste at an approved disposal facility. Approximately 350,000 tons of anhydrous HF are used annually in the United States.
Explanation:
plsss answer this?? i need help
Answer:
85.34 g of oxygen
Explanation:
Carbon and Oxygen combine in ratio 3:8 to form CO2
Weight of C = 32g
3g of carbon reacts with 8g of oxygen
1g of carbon reacts with 8/3 g of oxygen
32 g of carbon reacts with 8/3 (32)
= 256/3
= 85.34 g of Oxygen
Hope it helps....
what is chemistry?
Answer:the branch of science which examines the material of the universe and changes that these materials undergo
Chemistry deals with composition,structure,properties of matter and changes that these materials undergo
What evidence did the team examine that matter is conserved when dry ice changes into a gas?
Answer:
Im not sure what you mean but I hope what I wrote helps you!
The Law of Conservation of Matter says that the amount of matter stays the same, even when matter changes form. Sometimes it may seem that matter disappears during a science experiment, but this law tells us that matter cannot magically appear or disappear, it simply changes from one form to another.
Explanation:
Which of the following is true for a gas under conditions of very low temperature? PV ÷ nRT = 1, because all gases behave ideally at very low temperatures. PV ÷ nRT = 1, because the actual volume of the gas molecules becomes considerable. PV ÷ nRT > 1, because the low temperatures speed up the particles. PV ÷ nRT < 1, because particles are unable to overcome intermolecular attractions.
The sodium salt, NaA, of a weak acid is dissolved in water; no other substance is added. Which of these statements (to a close approximation) is true?
Answer:
Your question is somewhat poorly worded, even so what I can contribute is the statement is false, since the salt is sodium chloride, where its severe chemical formula NaCl, is a SALT not an acid and if it dissolves in water, seriously the solute of a solution, where water plays the role of the solvent
Explanation:
Sodium chloride is a binary salt, very easy to dissolve in water, it is also called the famous table salt, since it can be ingested in food even though it is not so recommended against high blood pressure conditions.
I need this fast plz, 50 points
By doing which action will you decrease the number of collisions and energy of reactant molecules?
A.) decreasing the temperature of the reactant mixture
B.) increasing the pressure of the reactant mixture
C.) decreasing the concentration of reactants
D.) adding a catalyst
Answer:
It is decreasing the temperature of the reactant mixture.
Explanation:
Just took the test
In order to decrease the number of collisions and energy of reactant molecules, the temperature of the reactant mixture would need to be decreased as well.
Temperature of reactantsThe temperature of reactants is proportional to the average kinetic energy of the molecules of the reactants.
Also, the higher the average kinetic energy of the reactant molecules, the higher their chances of colliding and reacting to form products.
Thus, in order to decrease their energy and collision frequency, the temperature of the reactant mixture needs to be decreased.
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Which structure below contains all of the others?
DNA
gene
chromosome
nucleus
Answer:
nucleus
Explanation:
The nucleus holds all the other things, keeping them safe and confined.
Answer:
Nucleus
Explanation:
It contains DNA which contains a GENE which contains a CHROMOSOME so its NUCLEUS
Give four differences between rusting and burning
Answer:
burning is a rapid process, rustig is a slow process. burning releases light during the process,rusting does not. burning can speed up with addition of more external conditions, rusting cannot be sped up greately by addition of external materials. burning results in release of large amts of heat, rusting very little amt of heat
Hope helped
plesse give a thank
and most brainlest
-Rust happens when something is unpolished and is old. Burning has been modified by heat.
-Burning is a chemical change. Rust is a physical change.
-Burning something cannot be fixed back to its natural form, while when something is rusted it can possibly be re-used and fixed.
-The texture of something burnt is usually fragile and brittle while rust makes (metal for example) gritty.
-Rust usually forms solely on metals while almost anything can be burned.
note: you asked for 4 answers but i gave you 5 in case you didnt like any of them. Hope this helps!
What does the pH of a solution measure?
O A. Color
O B. Volume
O c. Temperature
O D. Acidity
Answer:
D is the correct answer acidity
Explanation:
pH is the logarithmic measurement of the H3O+-concentration in water solutions.
By definition: pH = -log[H3O+]
Example: [H3O+] = 1.0*10-7 mol/L in neutral, pure water (at 25oC), so
pH = -log(H3O+) = -log(1.0*10-7) = 7.0
Geetha took some grains of boiled rice in test tube A and Tina took boiled and chewed rice in test tube B. Both of then poured 1-2 drops of iodine solution into the test tubes. What would they have observed? Give a reason for your answer.
Answer:
Test tubes A and B turn a darker blue color.
Explanation:
Based on the information provided in the question it can be said that they should have noticed that Tube A and Tube B turned a dark blue color. This is because the starch turns the solution in the test tubes into a dark blue color due to the negative reaction caused by the conversion of starch present in salivary amylase
