Answer:
The mass of water to be added is 2 pounds
Explanation:
The given parameters are;
The mass of the given solution = 2 pounds
The concentration of the given solution = 30%
The desired concentration of the solution = 15%
The mass, m of the acetic acid in the given solution = 30% × 2 pounds
m = 30/100 × 2 pounds = 0.6 pounds
To make a 15% acetic acid solution of acetic acid, the mass X of the required volume, is given as follows;
15% of X = 0.6 pounds
15/100 × X = 3/20 × 0.6 pounds
∴ The mass of the solution required X = 0.6 × 20/3 = 4 pounds
The mass of the solution that will contain 0.6 pounds of acetic acid giving a 15% acetic acid solution is 4 pounds
Therefore, the mass of water to be added to the original solution to make the a 15% acetic acid solution is 2 pounds.
An atom of which element is represented by the model of a neutral atom? A Carbon (C) B Oxygen (O) C Sulfur (S) D Nitrogen (N) 6. Which of the following describes a proton? I. Has mass II. Has no mass III. Has a positive charge IV. Found in the cloud V. Has a neutral charge A II, IV and V B I, III, IV C II and IV D I and III
Answer:
A. Carbon
B. I, III
Explanation:
Carbon has four valence eletrons meaning that it is more stable than the other choices. A proton has mass and has a positive charge.
A student sets up the following equation to convert a measurement. (The stands for a number the student is going to calculate.) Fill in the missing part of this equation. Note: your answer should be in the form of one or more fractions multiplied together.
Answer:
0.090 J/(mmol·°C) × (1000 mmol/mole × 1 kJ/(1000 J)) = 0.090 kJ/mole
Explanation:
The unit of conversion from kilo-Joules to Joules is given as follows;
1000 Joules = 1 kilo-Joule
The unit of conversion from milimoles to moles is given as follows;
1000 milimoles = 1 Mole
Therefore, we have
The value of the given expression is 0.090 J/(mmol·°C) × 1000 mmol/mole × 1 kJ/(1000 J) = 0.090 kJ/mole
0.090 J/milimole = 0.09 kJ/mole.
Select the correct answer.
A substance is followed by the symbol (1) in a chemical equation. What does the symbol represent?
O A.
The substance has the least molecules in the equation.
O B.
The substance is in the liquid state.
OC.
The substance is produced last in the reaction.
D.
The substance is dissolved in a liquid solution.
OE.
The substance is lost at the end of the reaction.
Answer:
The substance is a liquid.
A substance is followed by the symbol (l) in a chemical equation. The symbol represent that the substance is in the liquid state. Therefore, the correct option is option B.
What is chemical equation?Chemical equations are symbols or chemical formulas that depict a chemical reaction symbolically. With a + sign separating the entities in the reactants and products, the reactant creatures are presented on the left and the end result entities are provided on the right.
Chemical formulas can be mixed, structural (represented by pictures), or both. The absolute values for the stoichiometric numbers are shown as coefficients next to the equations and symbols of the various entities. Jean Beguin drew the initial chemical equation in 1615. A substance is followed by the symbol (l) in a chemical equation. The symbol represent that the substance is in the liquid state.
Therefore, the correct option is option B.
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which of these time measurements is the smallest? 0.02 seconds, 0.02 teraseconds, 2,500 milliseconds, or 25,000 nanoseconds?
Answer:
25000 nanoseconds
Explanation:
Answer:
i think it's 25,000 nanoseconds :)
Explanation:
When you crush a glow stick and shake it, the two liquids mix and the stick glows. Which statement is true?
Answer:it B,
Explanation: you make two liquids react together. Energy is being given off because light is emitted. The electrons of the liquids must be losing energy in order to produce light.
Someone plz help I Don’t know I would do something like this and I really need to get it done
three examples of monosaccharides
Answer:
three example of glocose, fructose, galactose.
describe how you could prove that a bicycle is matter
Atoms are the building block of science for starters meaning that all solid and liquid thing will contain atoms. Matter is anything that has mass and takes up space. So, in order to prove that air is matter, we need to prove that air has mass and takes up space. To prove that a bicycle has matter, you would need to show that it has a weight and will take up space.
Thank you hope this helps you out!
3.6x = 0.6x + 13 I really need help
Answer: x=13/3
Explanation:
step 1: multiply both sides by 10: 36x=6x+130
step 2: subtract 6x from both sides 30x=130
step 3: divide both sides by 30: x=13/3
What does it mean when an element is reduced? It empties a valance shell, reducing its atomic radius. It gains electrons, reducing its overall charge. It increases electronegativity, reducing its ability to bond. It loses electrons, reducing its electron number.
Answer:
It gains electrons, reducing its overall charge
Explanation:
When an element is reduced, It means It gains electrons, reducing its overall charge. Hence the correct option is (B)
What is Reduction ?
Redox is a type of chemical reaction in which the oxidation states of substrate change.
Oxidation is the loss of electrons or an increase in the oxidation state (Charge) of a chemical or atoms within it.
Reduction is the gain of electrons or a decrease in the oxidation state (Charge) of a chemical or atoms within it.
Therefore, When an element is reduced, It means It gains electrons, reducing its overall charge. Hence the correct option is (B)
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How do you write 561983 in scientific notation?
Answer:
5.61983 × 10^5
Explanation:
Move the decimal forward 5 spaces, each time doing so you add 10^(# of spaces moved, in this case 5)
9 x 1025 m
How many significant figures are in
this measurement?
Answer: 9000 - 1 significant figure
Explanation: Since you are multiplying, the number with the least amount of significant figures determines the number of significant figures in the answer. The number 9 has 1 significant figure and 1025 and has 4 significant figures so 9 has the fewest significant figures, meaning your answer will be 1 significant figure.
I need help with atomic numbers can you please teach me and tell me the answer you will get 10 points
Answer:
[tex]\frac{6}{3} Li^{-}[/tex]
Explanation:
The number of protons and neutrons together create total atomic mass.
The number of protons determine what element it is on the Periodic Table.
The number of electrons v protons determine the charge of the atom.
Protons are positive, electrons are negative, neutrons have no charge.
Since there is 1 more electron than protons, the overall charge is going to be -1.
We are given that there are 3 protons, so that gives us the Lithium element with a -1 charge.
Add up the 3 protons with the 3 neutrons and we get 6 as the total atomic mass in this atom.
Some people argue that a policy of putting out wildfires is having a negative long-term effect on the number and strength of wildfires. Suggest why this could be the case.
Answer:
The answer to this is simple.
There is a school of thought that believes that natural fires are necessary.
Explanation
They are required to reduce the density of the forests that are so thick that when they eventually burn, the effects are usually catastrophic. According to one source, some of these forests are over a hundred years old. When eventually these kinds of forests catch fire, they become very hard to manage and the destruction the leave are usually worse off than if they had not been allowed to so heavy and impenetrable.
Another reason put forward by this school of thought is that the countries who own these forests have politicised wildfires using them as an excuse to attract international funding/assistance because the fires are depleting the worlds protective greenery/earth biggest natural oxygen factory.
Cheers!
An organic chemist measures the temperature T of a solution in a reaction flask. Here is the result. T=35.649C. Convert T to SI units. Round your answer to 3 decimal places.
Answer: 308.649 K
Explanation:
Temperature in Celsius would be converted to Kelvin (K), which is the widely accepted S.I units for measuring Temperature in Chemistry.
Kelvin (K) = 273 + Celcius
= 273 + 35.649 C
= 308.649 K
How many significant figures does the number have?
9,000,100
Answer:
5 Significant Figures
Explanation:
plzzzzzzzzzzzzzzzzzzzzzzzz help
Gases, bc its expand the most upon heating because the intermolecular space is more than in solids or liquids.
intermolecular space = the space between each particles
Gases
the intermolecular space between gases is more than in solids and liquid
how many significant figures are in 6? thanks!
Answer:
There is only 1 sig figures in 6
Explanation:
There is no 0 after it so it is considered as only 1 significant figure
24/7 HELP NEEDED !!!
Is anybody willing to help me take my chem class?
Do my (Homework/Exams) whenever needed? I’m willing to venmo / cash app you after I pass my class? Please I’m begging you.
I'm really sorry but you shouldn't be asking anyone this question. I know chem is hard so you should put a little effort into the class. Save the money that you would be using to pay people and save it up as a big reward for passing chem class. Chemistry is valuable information that could help you in your future life. Please dont hate me for this. just trust me. If you put in the extra work then you will feel good about it when you pass the class. If the teacher find out that you cheated, it would probably go on your permanent record. Hope this helps
Answer: yo i’m down :)
Explanation:
If a question is testable and can provide an answer based on empirical observations and reasonable logic, it can be answered with science.
Answer:
True
Explanation:
What is the Scientific notation for 8,950,000
Please help and if you can please explain how you got that answer
Answer: C
Explanation: A good hypothesis is an “If...then,” statement and you are looking for which tomato plant grows the best. Vitamin A is the independent variable and the height is the dependent variable.
describe how carbon skeletons may vary and explain how this variation contibutes to the diveristy and complecity of organic moleculs
Answer:
Carbon is a highly covalent element due to the presence of four valence electrons in its outermost shell. This helps it bond covalently with other elements in various ways.
Carbon is known to be the backbone for most compounds. The carbon backbone vary in length and in the mode of bonding such as having the ability to from straight, branched, rings, double or triple bond which contibutes to the diversity and complexity of organic molecules.
Match the following words.
1. A substrate binds to an enzyme at the _______ where the reaction occurs.
2. In a catalyzed reaction, a reactant is often called a __________
3 ________is a measure of how fast an enzyme can convert the reagent to the product.
4. An inorganic substance necessary for the function of some enzymes is called a___________
5. When properly aligned, the enzyme and substrate form an enzyme-substrate (ES) __________
6. A small organic molecule necessary for the function of some enzymes is called a ___________
a. activity
b. cofactor
c. active site
d. substrate
e. complex
f. coenzyme
Answer:
1. active site
2. substrate.
3. activity
4. cofactor
5. complex
6. coenzyme.
Explanation:
1. A substrate binds to an enzyme at the active site where the reaction occurs.
2. In a catalyzed reaction, a reactant is often called a substrate.
3 activity is a measure of how fast an enzyme can convert the reagent to the product.
4. An inorganic substance necessary for the function of some enzymes is called a cofactor.
5. When properly aligned, the enzyme and substrate form an enzyme-substrate (ES) complex.
6. A small organic molecule necessary for the function of some enzymes is called a coenzyme.
Identify each of the highlighted materials as an element, a compound, or a mixture, and explain your reasoning.
Answer: Butane and benzene are both compounds. They contain multiple elements bonded together in a specific ratio. Kerosene and gasoline are mixtures because they are combinations of several compounds. Oxygen is an element because it is made up of only one type of atom.
Explanation: im doin edge 2020
Butane and benzene both are compounds. Gasoline and kerosene both are mixture and oxygen are an element.
What are elements and compounds?A substance can not be broken into simple components by any chemical reaction is called elements.
A substance is from a combination of two or more different chemical elements is called compound.
Butane (C4H10) and benzene(C6H6) are both compounds. They contain multiple elements like carbon and hydrogen bonded together in a certain ratio.
Kerosene is a combination of hydrocarbons and basically it is made up of aromatic hydrocarbon and gasoline is a mixture of hydrocarbons, additives and blending agent so kerosene and gasoline both are mixtures.
Oxygen is an element because it is made up of only one type of atom.
Butane and benzene both are compounds. Gasoline and kerosene both are mixture and oxygen are an element.
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Will mark you brainliest!
Answer:
D) lithium
Sodium Chloride is salt which is oviously present.
Oxygen is also present because fish use their gills to get oxygen from water.
Plants are present under ocean which release Carbon dioxide.
When salt dissolves in water what type of substance is formed
Answer:
homogeneous solution
Explanation:
Hoped that helped :)
Answer:
A mixture
Explanation:
When salt dissolves in water mixture is formed.
It can be separated by evaporating then condensing the water.
Both substances retain their old property.
Hope this helps
Mercury is a liquid metal having a density of 13.6 g/ml. What is the volume of 5.00g of mercury metal
Answer:
The volume of mercury is 0.368mL .
Explanation:
You have to apply Density formula, D = mass/volume. Then, substitute the following values into the formula :
[tex]density = \frac{mass}{volume} [/tex]
[tex]let \: density = 13.6 , mass = 5[/tex]
[tex]13.6 = \frac{5}{vol} [/tex]
[tex]13.6 \times vol = 5[/tex]
[tex]vol = 5 \div 13.6[/tex]
[tex]vol = 0.368ml \: (3sf)[/tex]
Volume of mercury metal of mass 5.00 g and density 13.6 g/ml will be
68 ml.
What is density ?Density of metal can be calculated by mass per unit volume. Density of a substance is directly proportional to mass and inversely proportional with volume.
Density= mass/ volume.
Volume= density * Mass
= 13.6g/ml * 5 g
= 68 ml.
Density of substance is directly proportional with mass and and inversely proportional with volume. If mass of the substance increases density increases, if volume of the substance decreases then density increase.
Therefore, Volume of mercury metal of mass 5.00 g and density 13.6 g/ml will be 68 ml.
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Which of the following types of energy does an object store in the bonds of atoms and molecules? (5 points)
Оа
Chemical energy
Ob
Gravitational energy
Ос
Kinetic energy
Od
Sound energy
Answer:
sound energy
Explanation:
Answer:
Chemical energy
Explanation:
A substance has a volume of 20 mL and a density of 2.5 g/mL. What is its mass?
Answer:
mass = 50 gExplanation:
Density of a substance can be found by using the formula
[tex]Density(\rho) = \frac{mass}{volume} [/tex]
From the question
Density = 2.5 g/mL
volume = 20 mL
To find the mass substitute the values into the above formula and solve for the mass
That's
Making mass the subject we have
mass = Density × volume
mass = 2.5 × 20
We have the final answer as
mass = 50 gHope this helps you
Answer:
mass=?,volume=20,density=2.5.
density=mass/volume.
which will be 2.5=mass/20
which is mass=2.5×20=50kg