Answers
Related Questions
Which of the following elements will have its valence electrons represented as in Figure A?
I. Oxygen and Sulfer
II. Selenium and Tellurium
III. Polonium only
A. I only
B. II only
C. III only
D. I, II, and III
Answers
Bc all of them in the 6th columns
PLEASE HELP ILL MARK BRAINLIEST
Answers
Answer:
1. true
2. existing matter
3. the materials simply turn into gases you cannot see
hope that helps! ☺
plz mark Brainliest!
??? Ipc helppp pllzz
Answers
-formation of a precipitate
-bubble formation
-color change
-temperature change
-odor formation
The only one that isn’t correct is change in state of matter. A change in a state of matter does not mean it’s a chemical change. For example, water boiling so it turns into gas is not a chemical change, and is a physical one. Also, water can freeze and turn into ice, which is also still a physical change. If something changes state of matter, it does not necessarily mean it’s a chemical change.
type a question about gas starting with “what if”
Answers
Answer:
what if we didn't have gas
Explanation:
6) 3.2 grams of sodium chloride is dissolved to make 0.25 liters of solution. Hint Convert grams to moles first! Molar mass of NaCl is 58.5 g/mol
Answers
Which solution is the least concentrated?
O 2 moles of solute dissolved in 4 liters of solution
how minimising the use of cars can help save the ozone layer
Answers
Answer:
minimizing the use of cars can help save the ozone layer by Minimizing the amount of gasoline which damages the ozone layer.
therefore the ozone layer is preserved.
have a nice day.
How many grams of Ag2S
are produced from 10.0
grams of AgI?
10
AgI + Nazs
Ag2S +NaI
Answers
Answer:
10.0 g of AgI will produce 5.28 g of Ag₂S
Explanation:
The balanced equation of the reaction is given below:
2AgI + Na₂S ----> Ag₂S + 2NaI
From the equation of reaction, 2 moles of AgI produces 1 mole of Ag₂S
The moles of a substance is related to its mass by a quantity known as molar mass which is defined as the mass of one mole of that substance.
Molar mass of AgI = (108 + 127) g = 235 g
Molar mass of Ag₂S = (108 × 2 + 32) g= 248 g
Mass of 2 moles of AgI = 2 × 235 g = 470 g
470 g of AgI produces 248 g of Ag₂S
10 g of AgI will produce 248 /470 × 10 g of Ag₂S = 5.28 g
Therefore, mass of Ag₂S produced = 5.28 g
Calculate the volume of a 0.15 mol dm-3 Ba(OH)2 solution required to completely neutralize 45 cm3 of a 0.29 mol dm-3 HNO3 solution. Note: Ba(OH)2 + 2HNO3 --> Ba(NO3)2 + 2H2O
Answers
Answer:
[tex]V_{base}=43.5cm^3[/tex]
Explanation:
Hello there!
In this case, given the neutralization chemical reaction of barium sulfate and nitric acid, it is possible to evidence the 1:2 mole ratio between them; thus, at the equivalence point we have:
[tex]2n_{base}=n_{acid}[/tex]
Which in terms of molarities and volumes is:
[tex]2M_{base}V_{base}=M_{acid}V_{acid}[/tex]
In such a way, by solving for the volume of base, we proceed as follows:
[tex]V_{base}=\frac{M_{acid}V_{acid}}{2M_{base}} \\\\V_{base}=\frac{45cm^3*0.29mol*dm^{-3}}{2*0.15mol*dm^{-3}} \\\\V_{base}=43.5cm^3[/tex]
Best regards!
help i dont wanna read
Answers
Answer:
I do not really no sorry
Explanation:
:))
The water cycle describes the continuous movement of water on earth. Which part of the water cycle is directly responsible for returning water to the soil
Answers
Answer:
mmmh..
Explanation:
sorryy id really ñike to help but i just dont know it...
Please Help I need to finish this by the end of the day!
Answers
Answer:
C
Explanation:
If I am not mistaken, due to the conservation of mass, whatever mass is on the side of the reactants should be the same for the product side.
This means
218.76g+53.96g = 272.72g
272.72g-266.66g = 6.06g
So the answer should be C
¿Alguien me puede resolver la siguiente conversión?? 25 L a mL, m3, ft3 y dm3 Se los agradecería mucho
Answers
Answer:
25000mL, 0.025m³, 0.88ft³, 25dm³
Explanation:
Para resolver esta pregunta debes tener claros los factores de conversión:
1L = 1000mL
1000L = 1m³
1L = 0.035315ft³
1L = 1dm³
25L son:
25L * (1000mL / 1L) = 25000mL
25L * (1m³ / 1000L) = 0.025m³
25L * (0.035315ft³ / 1L) = 0.88ft³
25L * (1dm³ / 1L) = 25dm³
Santee Cooper is stocking lakes Marion and Moultrie with 109,000 sterile grass carp. The grass carp, which eat hydrilla (Invasive species), are the most effective and least Intrusive means to control the weed. What type of control are they using?
A Invasive
B biological
C.chemical
D physical
Answers
Answer:
biological
Explanation:
i took the test and got it right
The average female voice emits a sound with a wavelength of 0.85 m. Given the speed of sound in air at 340 m/s, what is the frequency:
Answers
Answer:
The frecuency is 400 Hz.
Explanation:
In a periodic wave the wavelength is the physical distance between two points from which the wave repeats itself. It is named by (λ). That is, the wavelength is the minimum distance between two points on the wave that are in the same state of vibration.
Frequency is represented by the letter f, and is the number of vibrations that occur in a unit of time. That is, how many ridges or valleys are repeated in a unit of time.
The propagation speed is the speed with which the wave propagates in the medium, that is, it is the magnitude that measures the speed at which the wave's disturbance propagates along its displacement. Relate the wavelength (λ) and the frequency (f) inversely proportional using the following equation: v = f * λ.
In this case:
v= 340 m/sf= ?λ= 0.85 mReplacing:
340 m/s= f* 0.85 m
Solving:
[tex]f=\frac{340 \frac{m}{s} }{0.85 m}[/tex]
f= 400 Hz
The frecuency is 400 Hz.
Someone help please! Extra points & brainlest!
Answers
Answer:
golgi apparatus
Explanation:
Answer:
vacuole
Explanation:
the answer is vacuole im pretty sure!
How many milliliters of an aqueous solution of 0.238 M iron(III) chloride is needed to obtain 18.8 grams of the salt?
_______mL
Answers
Explanation:
Salt?%$- RICE BUTTRESS Ê TCHAIKOVSKY
Consider this reaction: NH4+ + HPO42− → NH3 + H2PO4−
Which is the conjugate base?
NH4+
NH3
HPO42–
H2PO4–
Answers
The conjugate base is formed when an acid loses its hydrogen or proton. In the reaction between ammonium ion and hydrogen phosphate, HPO₄²⁻ is the conjugate base. Thus, option C is correct.
What is a conjugate base?Conjugate bases are formed when the substance accepts or absorbs the proton or the hydrogen ion from the acids in the solution. It can be said as a base with an added hydrogen ion to it.
The chemical reaction of the acids and the bases has been shown as,
NH₄⁺ + HPO₄²⁻ → NH₃⁺ + H₂PO₄⁻
From the reaction, it can be said that ammonia donated its proton, whereas HPO₄²⁻ accepted hydrogen ions from the acid.
Therefore, HPO₄²⁻ has been the conjugate base in the given chemical reaction.
Learn more about conjugate base here:
https://brainly.com/question/12883745
#SPJ5
H2SO4 + 2 KOH --> K2SO4 + 2 H2O
Combustion
Synthesis
Decomposition
Single replacement
Double replacement
O Neutralization
Answers
Something that has all the characteristics of lif
Answers
Answer:
humans or animals
Explanation:
Select the compound that is soluble in water?
Answers
Answer:
NaOH
Explanation:
NaOH is among the water soluble bases
Help quickly pleaaas
Answers
Answer:
chymotrypsin, cleaves peptide bonds selectively on the carboxylterminal side of the large hydrophobic amino acids such as tryptophan, tyrosine, phenylalanine, and methionine
Under certain conditions butane reacts with oxygen to form butanone which can be easily hydrogenated to butanol. Butene is easily made from butanol by elimination of water.
Explanation:
These are for the first too
Please help me out with this thanks
Answers
10) How much 0.075 M NaCl solution can be made by diluting 450 mL of 9.0 M NaCl?
Answers
Answer:
54L
Explanation:
What is the Hsol for KF →K+ + F-? The lattice energy is –784 kJ/mol, the enthalpy of hydration for Ki is –336
kJ/mol, and the enthalpy of hydration for F-is-431 kJ/mol. Use AHsol= - Hiat + Hydr
0-879 kJ/mol
0 -17 kJ/mol
O 17 kJ/mol
O 1,551 kJ/mol
Answers
Answer:
17 kJ/mol
Explanation:
got it on edge
I need help with this question
Answers
When a substance freezes, _____.
it releases thermal energy
it absorbs thermal energy
it changes from a solid to a liquid
its temperature drops
Answers
Answer:
It's temperature drops, and if releases thermal energy
Answer:
Its temperature drops
Q4
Which of the following is an example of nonpoint source pollution?
A. industrial effluent
B. Agricultural runoff
C. illegal dumping of waste
D. Oil leaking from your car
Answers
Answer:
Option C.
Ilegal dumping of waste
Explanation:
This is because non point source of pollution refers to source of pollution that are many and not directly one which is illegal or does not meet the legal term. This type of pollution does not have a point source, it has many sources and this type of pollution is cause by rainfall or precipitation. Where when the rain fall, it wash away the waste through to water bodies, causing pollution and endangering water bodies.
if a car collides with a barrier and hit with a hundred 50 Newtons of force how much force does the barrier put in the car?
Answers
Answer: 50 Newtons
Explanation:
Due to newtons third law of motion for every action there is an equal and opposite reaction or in this case the equal and opposite amount of force applied so the same 50 N is applied on the car by the barrier
What is the application of separating funnel
Answers
Answer:
Used for liquid extractions
Explanation:
Answer:
the application of separating funnel is
to separate immiscible liquids from their solutes.
why do we use anticides
Answers
Answer:
If you mean antacids (bases) it to neutralise stomach acids that have been disturbed.
Explanation: