Purple Group Header Warm-Up Why can I smell a chocolate bar even though it is a solid? Read the description of the office mystery and write your prediction below. On a warm afternoon, a Universal Space Agency office worker returned from lunch break and noticed the office smelled like chocolate. She didn't see anything in the air, but she noticed her coworker was opening the wrapper of a solid bar of chocolate. Why can the office worker smell the chocolate bar even though it is in solid form?
Answer:
The smell of a chocolate is from the presence of volatile compounds present in the chocolate bar which at room temperature readily changes phase from solid to liquid to vapor or gas
Explanation:
There are nearly 600 identified compounds present in a chocolate bar and out of these, there are volatile components which gives the chocolate bar its distinctive aroma.
These volatile chocolate contents readily change phase from solid to vapor, with very short duration liquid phase.
For example, 3 methylbutanal, vanillin, and several organic compounds which are known to be readily volatile.
PLEASE I REALLY NEED ANSWER REAL QUICK
1. 800g of solution of NaCl has 5% of the percent by mass. Find mass of water is required?
a. 780g
b. 760g
c. 740g
d. 720g
e. Other.. and give solution.
Answer:
b. 760 g
Explanation:
The mass of the solution = 800 g
5% of NaCl by mass of the solution can be determined as follows;
5% of 800 = [tex]\frac{5}{100}[/tex] × 800
= 5 × 8
= 40 g
The mass of NaCl in the solution is 40 g.
The mass of water = mass of solution - mass of NaCl
= 800 - 40
= 760 g
Therefore, the mass of water required is 760 g.
what is ⅓ of 21
answer me this please
Answer:
7
Explanation:
1/3 of 21 is also the same as 21/3, which is 21 divided by 3
So the right answer is 7.
please see attached picture for full solution
hope it helps
Good luck on your assignment
A(n)________ can change shape and volume.
Answer:
gas and liquid
Explanation:
right?
An object has a mass of 10 kg. when a net force of 40 n north acts on the object, what is it’s acceleration ?
Answer:
4m/s² north.
Explanation:
Data obtained from the question include the following:
Mass (m) = 10Kg
Force (F) = 40N North.
Acceleration (a) =...?
Force is simply the product of mass and acceleration. It is represented mathematically as:
Force (F) = Mass (m) x acceleration (a)
F = ma
With the above formula, we can obtain the acceleration of the object as follow:
40 = 10 x a
Divide both side by 10
a = 40/10
a = 4m/s²
Since the force was applied in the north direction, the object will also accelerate in the north direction. Therefore, the acceleration of the object is 4m/s² north.
The solubility of a solute and solvent at a given temperature is 30.65 g/100 mL.
How much of the solute could be dissolved in 2 L of the solvent?
Please remember to consider significant figure or precise value rules.
Answer:
613.0 g
Explanation:
2 L = 2000 mL
(30.65 g/100 mL)*2000 mL = 613.0 g
Given:
Solute + solvent = 30.65 g/100 mLSolvent = 2LSolution:
Firstly,
We converted L to mL
2 L = 2 × 1000 mL = 2000 mL [ 1 L = 1000 mL ]
Now,
Solute = 30.65/100 × 2000
= 30.65 × 2000 / 100
= 61,300/100
= 613
Which is more reactive: Lithium or calcium?
Answer:
Lithium is more reactive than calcium.
Explanation:
Lithium is more reactive than calcium. don't forget, lithium has one electron in its outer shell while calcium has . ... therefore less power is required to put off the the one electron from lithium than to remove the 2 from calcium, so lithium is more reactive.
Hope this helps..
Answer:
Lithium
Explanation:
You can ingest Calcium but not Lithium due to its toxix reactivity.
which statement describe a species adapting to changes in it’s environment?
Answer:
c
Explanation:
I would think adapting to changes would be the light moth being in a light trunk of a trees.
Answer:
a
Explanation:
dark colored moths become common after tree trunks become dark took the test.
fill in the blank
1 electronic configuration of 1531p is
2.what would be the atomic number of an atom with 6 valence element
Answer:
I didn't get you
Explanation:
Please explain
help me with 23 fast
Answer:
a salt
Explanation:
compounds are made of molecules but we need to mention the type of compound formed.
Answer:
A salt
Because compounds are made of molecules but we need to mention the type of compound formed.
Which compound is an isomer of C2H5OC2H5?
A) CH3COOH
B) C2H5COOCH3
C) C3H7COCH3
D) C4H9OH
Answer:
D) C₄H₉OH
Explanation:
In chemistry, isomers are chemical substances with the same formula (That is, same atoms but in different structures).
For the compound C₂H₅OC₂H₅ there are 4 atoms of C, 10 atoms of H and 1 atom of O.
A) CH₃COOH . This compound have 2 atoms of C, 4 atoms of H and 2 atoms of O. Thus, isn't an isomer.
B) C₂H₅COOCH₃. There are 4 atoms of C but 8 atoms of H and 2 atoms of O. Isn't an isomer
C) C₃H₇COCH₃. There are 5 atoms of C, 10 atoms of H and 1 atom of O. Thus, isn't an isomer
D) C₄H₉OH. Here, you have 4 atoms of C, 10 atoms of H and 1 atom of O. That means this structure is the isomer of C₂H₅OC₂H₅
A chemist dissolves 73 grams of sodium chloride (NaCl) in water. The final volume of the solution is 1,050 milliliters. What is the molarity of the solution?
Answer: 1.2
Explanation:
Write the balanced equation for the production of oxygen gas and potassium chloride from the decomposition of potassium chlorate.
Answer:
2KClO₃→3O₂ + 2KCl
Explanation:
When Potassium Chlorate decomposes , the resulting products are oxygen gas and Potassium chloride . As per the equation above
C5H12, pentane, is a liquid at room temperature.
Can we predict from this information whether C4H10, butane, will be a liquid at room temperature?
A)Yes, it will be a liquid since pentane is a liquid.
B)Yes, it will be a liquid since it contains 4 carbon atoms.
C)We cannot be sure unless we find out its boiling point.
D)We cannot be sure unless we get the boiling point of propane, C3H8.
Answer:
C)We cannot be sure unless we find out its boiling point.
Explanation:
It is necessary to clearly explain here that simply observing two compounds of the same homologous series irrespective of how close they may be in the series will not give us the faintest idea regarding which one will be a liquid, solid or gas at room temperature.
However, to determine whether an unknown substance will be a liquid at room temperature, then its important to measure its boiling point. If the boiling point is above room temperature, and the melting point is below room temperature, the compound is a liquid. If the boiling point of the unknown substance is below room temperature, it is a gas.
It is now safe to conclude that cannot decide on the state of matter in which a compound exists unless we know something about its boiling point, not merely looking closely at the properties of its neighbouring compounds in the same homologous series
What is the general formula for the homologous series that includes ethene?
Answer:
See below
Explanation:
The common formula of the same alkene series is CnH2n, where n is the quantity of atoms of carbon. Owing to the hydrocarbons of alkenes with at least one double carbon relation, the alkene-like sequence starts with ethen C2H4.
Hope this helps.
The general formula for the homologous series which includes ethene is alkenes.
Alkenes
They are homologous series with the general formula CxH2x.
Where:
x = number of carbon atoms.
Examples are methene with one carbon atom: CH2
Ethene with 2 carbon atoms: C2H4
Propene with 3 carbon atoms: C3H6
More on alkenes can be found here: https://brainly.com/question/7337516
I. Plant cells are formed from fertile soil. II. Cells must function properly for an organism to be healthy III.Cells make up the petals, stem, and leaves of a lily plant. IV. Bacteria are produced from other living bacteria. Which describes the statements that Schwann and Schleiden would make?
Answer:
No. 4
Explanation:
Bacteria are produced from pre existing bacteria
Alex is on a special diet and needs to watch her intake of carbohydrates. Her doctor told her to maintain a 1,500 calorie per day diet and to make sure that these come from no more than 20% carbohydrates. She is snacking on pretzels and the nutrition label on the package says that there are 23 grams of carbohydrates per serving, which is 8% of the recommended daily allowance.
How many calories should Alex get from carbohydrates and what percentage of her total recommended intake of carbohydrates in grams is this snack? (1 gram of carbohydrate provides 4 Calories.)
Alex should get 300 Calories from carbohydrates, which is about 75 grams. This snack is 30% of her total grams of carbohydrates per day.
Alex should get 300 Calories from carbohydrates, which is about 33 grams. This snack is almost 70% of her total grams of carbohydrates per day.
Alex should get 300 Calories from carbohydrates, which is about 60 grams. This snack is about 38% of her total grams of carbohydrates per day.
Alex should get 300 Calories from carbohydrates, which is about 75 grams. This snack is 8% of her total grams of carbohydrates per day.
Answer: Alex should get 300 Calories from carbohydrates, which is about 33 grams. This snack is almost 70% of her total grams of carbohydrates per day.
Answer:
B
Explanation:
I think
Please help me complete the following word equations:) also write the balanced equation, full ionic equation, and net ionic equation. Also include the states:)
a) zinc nitrate + calcium sulphide—>
b) potassium + calcium chloride—>
Explanation:
The states may differ depending on the reactions
State two characterstics of matter demostred
by
Diffusion
.) Brownian mation
What aspect relates to energy
Answer:
Respiration
Explanation:
it is the process by which food is broken down in the cell to release energy
What is Le Chatelier Principle ? Explain
Balance the following Equation and identify what type of reaction it is:
AlBr3 + K2SO4 ---> KBr + Al2 (SO4)3
Answer:
2AlBr3+3K2So4----> 6KBr + Al2(So4)3
Explanation:
Why are fictional groups important
Answer:
Functional groups are important in chemistry because they are the portion of a molecule that is capable of characteristic reactions.
Explanation:
Answer:
pls help
Explanation:
What is the name of CH3CH2CH2COOH?
Answer:
Butanoic acid
Explanation:
If 18.0 kJ of energy are applied to 250. grams of water at 37°C, what will be the final temperature
Answer:
54.1°C
Explanation:
Now we have the following parameters from the question;
Heat applied (H)= 18.0×10^3 Joules
Mass of the water(m)= 250g= 0.25Kg
Initial temperature of the water (θ1)= 37°C
Final temperature of the water (θ2)= the unknown
Heat capacity of water (c) = 4200JKg-1
From ;
H= mc(θ2-θ1)
Substituting values appropriately
18×10^3= 0.25 × 4200(θ2-37)
18×10^3 = 0.25 × (4200θ2 - 155400)
18×10^3 = 1050θ2 - 38850
18×10^3 + 38850 = 1050θ2
56850 = 1050θ2
θ2= 56850/1050
θ2= 54.1°C
the solution of ash of magnisium ribbon is ____
Answer:
Alkaline
Explanation:
The solution of ash of magnesium ribbon is alkaline.
Use Hess's Law to determine the enthalpy change (∆H) for the reaction: ClF + F2 → ClF3 Given: 2ClF + O2 → Cl2O + F2O. ∆H=167.4kJ 2ClF3 + 2O2 →Cl2O + 3F2O. ∆H=341.4kJ 2F2 + O2 →2F2O. ∆H=-43.4kJ
Answer:
The enthalpy change (∆H) for the reaction is -108.7 kJ
Explanation:
Hess's law can be stated as: when the reactants are converted to products, the enthalpy change is the same, regardless of whether the reaction is carried out in one step or in a series of steps. Then, Hess's Law states that the enthalpy of one reaction can be achieved by algebraically adding the enthalpies of other reactions.
So, to calculate the ∆H (heat of reaction) of the combustion reaction, that is, the heat that accompanies the entire reaction, you must make the total sum of all the heats of the products and of the reagents affected by their stoichiometric coefficient ( number of molecules of each compound participating in the reaction) and finally subtract them.
Enthalpy of combustion = ΔH = ∑Hproducts - ∑Hreactants
2 ClF + O₂ → Cl₂O + F₂O ∆H=167.4kJ
Cl₂O + 3 F₂O → 2 ClF₃ + 2 O₂ ∆H= -341.4kJ
The previous equation must be inverted, and the enthalpy value is also inverted, that is, the sign is changed.
2 F₂ + O₂ →2 F₂O ∆H=-43.4kJ
Reactants and products are added or canceled, taking into account that certain substances sometimes appear as a reagent and others as a product, so they are totally eliminated (there is nothing left of them anywhere in the reaction, if the same amount in reagents and products) or partially (this substance remains, in less quantity, only on one side), obtaining:
2 ClF + 2 F₂ → 2 ClF₃
Then, as all the reactants and products have a stoichiometric coefficient of 2, dividend by that number is obtained:
ClF + F₂ → ClF₃
Adding the enthalpies algebraically, and dividing by 2, because to get the "data" reaction you had to multiply by two, you get:
ΔH= [167.4 kJ - 341.4 kJ - 43.3 kJ]÷2
ΔH= -108.7 kJ
The enthalpy change (∆H) for the reaction is -108.7 kJ
The pH of a solution is 2.0. Which statement is correct?
Useful formulas include [H30+1 = 1070F, FOH-7-10 +0H, PH+pOH = 14, and [H30 [0H-]- 10-14
Answer:
pH + pOH = 14, [H₃0⁺] [0H⁻] = 10⁻¹⁴
Explanation:
When it comes to questions involving pH, the equations used are;
[H₃0⁺] [0H⁻] = 10⁻¹⁴
This equation shows the concentration of hydroxonium ions alongside that of the hydroxide ions.
pH + pOH = 14
If the value of either the pH of the pOH is know,one can calculate the value of the other using this equation.
Answer:
The answer is A. The pOH of the solution is 12.0
Explanation:
The formula for pOH is:
pOH = 14 - pH
We know that the pH value is 2.0 so we plug it in the equation:
pOH = 14 - (2.0)
After simplifying it, we get an answer of 12.0 which is the pOH value.
Hope this helps!
please help with the question tagged below
Answer:
It can lose it's electrion
Explanation:
elements that are anions
Answer:
I hope this will help its not much
Explanation:
