Determine from the balanced chemical reaction if
the derived mole ratio is correct or incorrect.
2FeBr3 + 3Na2S → Fe2S3 + 6NaBr
2 moles FeBra
3 moles Na2S
Answers
Answer:
Correct
Explanation:
According to the balanced chemical reaction, 2 mol FeBr3 are consumed for every 3 mol Na2S consumed.
A balanced equation obey the law of conservation of mass. The coefficients are the numbers which are added to balance the chemical equation. Here the given mole ratio is correct.
What is a balanced equation?An equation in which the number of atoms of reactants and products on both sides of the equation are balanced is defined as the balanced chemical equation. The coefficients which are added in front of the formula of each component represents the number of the species.
A molar ratio denotes the ratio between the amounts in moles of any two compounds involved in a balanced chemical reaction. By comparing the coefficient of each component, the mole ratio can be determined.
Here for the given reaction, for every 3 moles of Na₂S consumption 2 moles of FeBr₃ is also consumed. So the molar ratio of Na₂S to FeBr₃ is 2/3. Molar ratios are used as the conversion factors between products and reactants in many chemistry problems.
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Answers
What is the formula for S2O5
Answers
Answer:
chemical formula
Explanation:
Scientific investigations must be well __________ to be sure the data collected will help answer the scientist's question
Answers
Answer:
The answer is relevant.
Scientific investigations must be well relevant to be sure the data collected will help answer the scientist's question.
What is a scientific investigation?A scientific investigation is an investigation that is done in the field of science. This unravels the secrets of the earth and the logical reason behind the things happening.
There are three types of scientific investigations. They are descriptive investigation, comparative investigation, and experimental investigation. When we see a thing happening in the environment or anywhere, always find a reason behind it.
The steps in completing a scientific investigation are:
Asking questionsTo make a hypothesis.Performing research.Making an observation.Analyzing the result.Thus, the scientific investigations must be well relevant to the data.
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helllllppppppp pleaseeeeeee
Answers
A sample of hydrogen changes its pressure from 756 torr to 499 torr while the temperature remains constant. After the pressure is reduced, the volume of the gas is 789 mL. What was the original volume?
Answers
P1 = 756 torr
P2 = 499 torr
V2 = 789 mL
V1 = ?
applying Boyle's Law
P1 * V1 = P2 * V2
756 torr * V1 = 499 torr * 789 mL
V1 = 499 torr * 789 mL / 756 torr
V1 = 520.78 mL
3. The mass percent of nitrogen in NH4Cl is *
O 16.7% nitrogen
0 25.0% nitrogen
0 26.2% nitrogen
O none of these
Answers
Answer:
None of these
Explanation:
The mass percent is 35.4% (3 s.f.)
14/4+35.5 = 14/39.5 x 100 = 35.4 (3 s.f.)
help, please ( rando words )
Answers
Answer:
ionic
Explanation:
Answer:
the answer is ionic
Explanation:
hope this helps!
please can i also have brainliest too?
Bronsted Lowry reactions can use hydroxide ions.
True
False
Answers
Answer:
f
Explanation:
is the distilled water/acidic/basic/netural?
Answers
Distilled Water Has A Neutral pH, Which Means It Is Neither Acidic Nor Basic. Therefore, It's Neutral.
1. Why do you think it is so important to think about momentum in the NASCAR world? Use the
equation for momentum (momentum = mass times velocity) in your answer. (Hint: NASCAR
drivers drive really fast.] 1 point
Answers
Answer:
because it is
Explanation:
simple
Answer:
Explanation: none
is it true or false?
Answers
Answer:
The rainforest is teeming with animals and insects, so you would hear humming. Frogs and birds make some of the loudest rainforest sounds.
howler monkeys, are the loudest so i think that its false cause lost of animals are there but some can be quiet
. Chalk is made of CaCO 3 . How many molecules are in 5 grams of chalk?
Answers
Answer:
20.02 grams of chalk.
Explanation:
name two examples which are not considered as matter
Answers
Answer:
Light and Sound can be considered as non-matter.
Explanation:
Various forms of Energy like Heat, Sound, Light can be considered as non-matter
A 20.0 mL of 0.27 M solution of the salt NaA has a pH of 8.70.
a) Calculate the pk, value of the acid HA.
(Correct to 3 sig. fig)
b) Calculate the pH of a solution containing 0.3 M HA and 0.1 M NaA.
(Correct to 3 sig. fig)
Answers
Answer:
a) 3.969
b) 3.489
Explanation:
a) Calculate the pk, value of the acid HA
PH of salt hydrolysis
P[tex]^{H}[/tex] = 1/2 ( pkw + pka + logC )
8.7 * 2 = 14 + log ( 0.27 ) + Pka
∴ Pka = 3.9686 ≈ 3.969
b) Calculate the PH of a solution containing 0.3 M HA and 0.1 M NaA
PH = Pka + log ( salt / acid )
= 3.9686 + log ( 0.1 / 0.3 )
= 3.9686 - 0.48 = 3.489
3 points
5. Which of the following is true regarding the atoms involved in a
chemical reaction? *
a) During a chemical reaction, atoms will always be combined into much larger
molecules.
b) Some of the atoms will always be changed into a different type of atom by a
chemical reaction.
c) Some of the atoms present before the reaction will always be lost during a
chemical reaction.
d) The same number of each type of atom will always be present before and after a
chemical reaction takes place.
Answers
Mass is never created or lost in a chemical reaction, so the atoms of each element must stay balanced.
object with a mass of 30 kg is observed to accelerate at the rate of 4 m/s2. Calculate the force required
Answers
Help plz 10 pointsss———-
Answers
Answer:
the first question is homeostasis. and the second question is the wolf panting
Explanation:
let me know if u need an explanation n ill try to give one :)
Is specific heat capacity always equal to heat capacity?
Answers
Answer:
No specific heat capacity and heat capacity are not equal
After eating, nutrients must be oved to other parts of the body. Which of the following systems will transport these nutrients.
nervous
digestive
circulatory
excretory
Answers
Answer:
The circulatory system
Explanation:
(PHYSICAL SCIENCE) Help please !!
Answers
How can an unbalanced force affect an object?
O Unbalanced forces keep an object at rest.
Unbalanced forces cause objects to accelerate.
O Unbalanced forces cannot affect on object.
Answers
is Tungsten carbide an elementary substance
or compound?
Answers
Answer:
Tungsten carbide (chemical formula: WC) is a chemical compound (specifically, a carbide) containing equal parts of tungsten and carbon atoms.
Answer:compound
Explanation:
PLEASE HELP ME!!!
A 38.8g piece of metal alloy absorbs 181J as its temperature increases from 25.0°C to 36.0°C°. What is the alloy's specific heat? Show your work.
Answers
0.424 J/g °C
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightEquality Properties
Multiplication Property of Equality Division Property of Equality Addition Property of Equality Subtraction Property of EqualityChemistry
Thermochemistry
Specific Heat Formula: q = mcΔT
q is heat (in Joules)m is mass (in grams)c is specific heat (in J/g °C)ΔT is change in temperatureExplanation:Step 1: Define
[Given] m = 38.8 g
[Given] q = 181 J
[Given] ΔT = 36.0 °C - 25.0 °C = 11.0 °C
[Solve] c
Step 2: Solve for Specific Heat
Substitute in variables [Specific Heat Formula]: 181 J = (38.8 g)c(11.0 °C)Multiply: 181 J = (426.8 g °C)c[Division Property of Equality] Isolate c: 0.424086 J/g °C = cRewrite: c = 0.424086 J/g °CStep 3: Check
Follow sig fig rules and round. We are given 3 sig figs.
0.424086 J/g °C ≈ 0.424 J/g °C
What is needed for our cells to get energy from our food?
Answers
Answer:
cellular respiration is needed for our cells to get energy from our food.
Explanation:
Through the process of cellular respiration, the energy in food is converted into energy that can be used by the body's cells. During cellular respiration, glucose and oxygen are converted into carbon dioxide and water, and the energy is transferred to ATP.
Which property of sulphuric acid makes it suitable to use as a catalyst for the preparation of esters?
Answers
Biomes are characterized by temperature, precipitation, and the plant and animal communities that live there.
True or false?
Answers
False
Calculate the calories of heat required to melt 35.0 g of ice.
Answers
Answer:
35.0g of ice at 0 degrees
Explanation:
The United States has landed a device on Mars.
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Answer:
They landed a Rover!
Explanation:
Isn't that Awesome!?!
True or false? To prepare 20.0 mL of 2.00 M solution of hydrochloric acid from a 10.0 M stock solution, you should take 4.00 mL of the stock solution and add 20.0 mL of water.
Answers
False. To prepare 20.0 mL of 2.00 M solution of hydrochloric acid from 10.0 M stock solution, 4.0 mL of the stock solution and 16.0 mL of water would be needed.
Recall the law of diffusion that:
C1V1 = C2V2, where C1 = initial concentration, V1 = initial volume, C2 = final concentration, and V2 = final volume.
In this case, if C1 =10.0 M, V1 = ?, C2 = 2.00 M and V2 = 20.0 mL
V1 = 2 x 20/10
= 4.0 mL
Hence, 4.0 mL of the stock solution would be taken. Since the final volume is 20.0 mL, only 16.0 mL of water would need to be added and not 20.0 mL.
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The chemical symbols of hydrogen, calcium and chlorine are:
H, C, Cl
H, C, Cn
H, Ca, Cl
Hn, Cal, Cl
Answers
Answer:
H, Ca, Cl is the answer dude
Answer:
hydrogen is H
calcium is Ca and chlorine is Cl