Answer:
Chemical energy is energy stored in the bonds of chemical compounds, like atoms and molecules. This energy is released when a chemical reaction takes place. Usually, once chemical energy has been released from a substance, that substance is transformed into a completely new substance.
Explanation:
A 10.151 g sample of window cleaner containing ammonia was diluted with 39.466 mL of water. Then 4.373 g of solution was titrated with 14.22 mL of 0.1063 M HCl to reach a bromocresol green end point. Find the weight percent of NH3 (FM 17.031) in the cleaner.
Answer:
2.878 (w/w)%
Explanation:
The reaction of NH3 with HCl is:
NH3 + HCl → NH4Cl
That means 1 mole of ammonia reacts per mole of HCl. The moles of HCl that reacts = Moles of ammonia are:
14.22mL = 0.01422L * (0.1063mol HCl / L) = 0.001512 moles HCl = Moles ammonia
In mass:
0.001512 moles NH3 * (17.031g / mol) = 0.02574g of NH3 in the solution.
The concentration in weight percent of the diluted solution is:
0.02574g of NH3 / 4.373g * 100 = 0.5887 (w/w)%
This is the concentration of the diluted solution that was diluted from 10.151g to 10.151g + 39.466g = 49.617g
-Assuming density of water = 1g/mL-
The solution was diluted:
49.617g / 10.151g = 4.888 times.
That means the concentration of NH3 in the original cleaner is:
0.5887 (w/w)% * 4.888 =
2.878 (w/w)%Describe the function of a cilia.
Answer:
hope it helps..
Explanation:
'Motile' (or moving) cilia are found in the lungs, respiratory tract and middle ear. ... These cilia have a rhythmic waving or beating motion. They work, for instance, to keep the airways clear of mucus and dirt, allowing us to breathe easily and without irritation.
Answer: to keep airway clear of mucus and dirt allowing us to breathe easy
Explanation:
which type of wave shows energy transmitted in a definite direction and with a definite speed?
In chemical reactions, what does the law of conservation of mass mean?
Group of answer choices
Matter is not created nor destroyed.
The total mass of the products is greater than the total mass of the reactants.
The total mass of the reactants is less that the total mass of the products.
Matter is not changed.
Answer
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
In chemistry lab, a student measured the density of liquid ethanol is 0.789 g/mL. Represent its density in units of 1b /in3? (2.54 cm = 1 in., 2.205 lb = 1 kg)
A. 9.09 x 10+ 1b / in
B.4.42 x 10-1b / in?
OC.2.85 x 10-2 16 / in
D. 0.106 16 / in?
O E.5.86 x 10" 16/in3
Answer:
Option C is correct option = 2.85×10⁻² lb/in³
Explanation:
Given data:
Density in g/mL = 0.789
Density in lb/in³ = ?
Solution:
It is given that,
2.54 cm = 1 in
2.205 lb = 1 kg thus,
1 mL = 1 cm³
0.789 g/cm³ × 1 kg/ 1000 g × 2.205 lb/1 kg × (2.54 cm / 1in)³
2.85×10⁻² lb/in³
The density of liquid ethanol is 0.789 g/mL, which is equivalent to 0.0285 lb/in³.
A student measured the density of liquid ethanol to be 0.789 g/mL and we want to convert it to lb/in³. We will need a series of conversion factors.
What is a conversion factor?A conversion factor is an arithmetical multiplier for converting a quantity expressed in one set of units into an equivalent expressed in another.
Step 1: Convert 0.789 g/mL to lb/mLWe will use the following conversion factors:
1 kg = 1000 g.1 kg = 2.205 lb.0.789 g/mL × (1 kg/1000 g) × (2.205 lb/1 kg) = 1.74 × 10⁻³ lb/mL
Step 2: Convert 1.74 × 10⁻³ lb/mL to lb/in³We will use the following conversion factors:
1 mL = 1 cm³.1 in = 2.54 cm.1.74 × 10⁻³ lb/mL × (1 mL/1 cm³) × (2.54 cm/1 in)³ = 0.0285 lb/in³
The density of liquid ethanol is 0.789 g/mL, which is equivalent to 0.0285 lb/in³.
Learn more about unit conversion here: https://brainly.com/question/13016491
Convert 3564 to Scientific Notation:
*
Answer:
3564 = 3.564 x 10^3
Explanation:
i.e expresing the value in standard form.
An element is lustrous, brittle, and silver colored. What type of element is it
Metal
Metalloid
Non Metal
Other
Will give brainlist
Which properties of grains determine the texture of rocks? Check all that apply.
feel
pattern
color
shape
size
I will mark Brainlyest
Answer:
color shape and size
Explanation:
Subscripts are used in a chemical formula to show the number of atoms of each element.
True or False.
If endothermic means that the temperature increases and exothermic means it decreases, it 64 degrees to 64 degrees (it stayed the same) endothermic or exothermic?
Answer:
The answer is none of them.
Explanation:
I did the study guide...Also, if it has no change, it is neither.
Calculate the number of molecules in 2.00 moles H2S.
Express your answer numerically in molecules.
Answer:
The answer is
1.204 × 10²⁴ moleculesExplanation:
The number of molecules can be found by using the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 2 × 6.02 × 10²³
We have the final answer as
1.204 × 10²⁴ moleculesHope this helps you
All of the following changes to a metal are physical changes except_____.
bending
melting
rusting
polishing
Answer:
D)Polishing..
Answer:
Wouldn't it be rusting
Explanation:
Melting and bending are physical changes so is polishing. so rusting is the only choice, for metal to rust wouldn't it need a chemical change.
What is matter?
A.
Anything that has energy
B.
Anything that changes volume
C.
Anything that takes up space
D.
Anything that produces heat
a b c or d no bull
Answer:
C. Anything That Takes Up Space.
Explanation:
A deck of cards has dimensions 8.9cm x 5.72cm x 1.82 cm. What is the volume of the deck in cubic centimeters?
Answer:
92.65256 cm^3
Explanation:
To find this, we can simply multiply all three dimensions to get the answer in cubic centimeters, and we get the answer above. If you want to be more specific, we can go by the sigfig rule and the answer would be rounded to 93 cm^3.
How does energy (heat) flow in the ocean?
Answer:
There is a connection between the ocean and the atmosphere (they work together to move heat and fresh water across the globe) . Heat can be transferred between the surface of a sea or ocean and the atmosphere through ;
RadiationConvection,Turbulent heat exchange Evaporation of waterCondensation of water vapor above the sea or ocean .Explanation:
In Natural selection, individuals whose unique characteristics are well-suited for an environment tend to survive and produce more offspring. true or false? i need this help!right now!
Answer:
True
Explanation:
True. If an animal has attributes to it that help it survive better in an environment, it will survive better than its counterparts who do not have this attribute. More survival = More offspring
Answer:
True.
Explanation:
It's called survival of the fittest. Animals are genetically supposed to be well suited to their environment and if they aren't, they die out.
Each orbit of an atom contains a set number of..........
Answer:
I'm pretty sure it's electrons
PLEASE HELP ME!!
I am smaller than Rb and bigger than Na but we are in the same family.
H
K
N
Cs
Is it easier to remove an electron from Mg or from Cl?
Mg
Cl
Answer: K and Mg
Explanation:
The first one refers to the atomic radius and increases going down and to the left on the periodic table. K is in between Rb and Na.
HELPPP
Which of the following pairs of elements is most likely to permanently transfer one or more electrons to the
other element?
a. Chlorine and phosphorus
b. Iron and bromine
c. Tin and lead
d. Nitrogen and oxygen
C2H6O
Percent Composition with work shown
Answer:
50 percent
Explanation:
percentage
The vaporization of Br2 from the liquid to the gas state requires 7.4 kcal/mol. write a reaction showing heat as a product or reactant
Answer:
Br₂(l) + ΔV → Br₂(g)
Explanation:
When a chemical or phase change occurs during a chemical process some heat is absorbed or released. For the process of vaporization of a substance, the heat (Usually required) is ΔV (How many energy is required for the process occurs).
In the vaporization of Br2 there are required 7.4kcal/mol, Δv. The reaction is:
Br₂(l) + ΔV → Br₂(g)Enter your answer in the provided box.
A sample of chlorine gas is confined in a 7.17-L container at 491 torr and 37.0°C.
How many moles of gas are in the sample?
mol Cl2
(3.1 x 10^3) (1.00 x 10^7) =
Answer:
(3.1 x 10^3) (1.00 x 10^7) = 31000000000
why some metals are more dense than others
How for way is the Neptune from the sun
Write a balanced equation for each of the acid-base reaction given below.a. Aqueous sulfuric acid with aqueous potassium hydroxide.
Answer:
H2SO4 + 2KOH => K2SO4 + 2H2O
Explanation:
The acid-base reaction is a type of chemical reaction that involves the exchange of hydrogen ions.
The acid-base reaction between aqueous sulfuric acid ( H2SO4 ) and aqueous potassium hydroxide (KOH) is a neutralization reaction that results in potassium sulfate and water.
sulfuric acid + potassium hydroxide => potassium sulfate + water
So, the balanced equation for this reaction is as follows:
H2SO4 + 2KOH => K2SO4 + 2H2O
Hence, the correct answer is "H2SO4 + 2KOH => K2SO4 + 2H2O".
Why do you think the hot red water sank to the bottom?
Answer:
i did this in school :) but Hot water will rise to the top because it is less dence and cold water will sink to the bottom because it is more dence
Explanation:
Help me lol
I’ll give branliest if two people answer
Answer:
I think all of the above
Explanation:
Put as brainliest if you wish
solve this very easy choose option fast
Answer:
i think its alcohol and salt because they put salt on the ground to dissolve the snow so what I think is its alcohol and salt cuz they both look like they would evaporate pretty easy and alcohol evaporates really really easy so I think it's alcohol and salt because salt May absorb it or something I don't know but yeah
Answer: alcohol and iodide
Explanation:
3.
What are valence electrons? How do you quickly determine the number of valence electrons an
atom has?
Answer:
Electrons that arent electrons
Explanation:
I teach chem
Answer:
Valence electrons are the electrons found in the highest and main energy level of the atom, being these responsible for the interaction between atoms of different species or between atoms of the same species. You can quickly determine these by looking at a periodic table like this one... Which is where the roman numbers come in and show the valence electrons. (THIS TABLE IS IN SPANISH, I hope you still recognize the symbols.) :))
how many moles in 1.505x10^23 Na atoms
Answer:
The answer is 0.25 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
N = 1.505 × 10²³ Na atoms
We have
[tex]n = \frac{1.505 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{1}{4} \\ [/tex]
We have the final answer as
0.25 molesHope this helps you