Which substance is completely consumed in a chemical reaction?
product
reactant
limiting reactant
Answer:
Limiting reactant
Explanation:
In a chemical reaction is the substance that is totally consumed when the chemical reaction is complete.
help for this practice work
Answer:
It's the third option.
Explanation:
In order for the chemical equation to be correctly it needs the same number of atoms of each element on both sides of the equal sign
3. Determine the amount of energy required to heat 3.50 moles of water vapor from 107°C to 13
4. How much energy is needed to heat a 27.50 grams of H₂O (s) at -20°C to H₂O (l) at 0°C?
Answer: See attached image
Explanation:
will favor dissolution and
will favor crystallization in a saturated solution of table sugar.
a. cooling, heating
b. heating, cooling
C. evaporation, heating
d. cooling, evaporation
Answer:
b) heating, cooling
Explanation:
Heating will favour dissolution (it helps dissolving faster).
Cooling helps in crystallization.
the answer to 54.34g-45.6g has how many significant figures
Determine the amount of energy required to heat 4.00 grams of H₂O (t) at 60°C to H₂O (t) at 85°C.
Answer: See attached image
Explanation:
Three elements, A, Q, and Z, have the molar masses indicated in the table below. Given a compound with a composition of 15.66% A and 84.34% Z by mass, what is the empirical formula of this compound?
element symbol molar mass
A 15.45 g/mol
Q 20.05 g/mol
Z 41.62 g/mol
Answer:
AZ₂
Explanation:
The formed compound will not contain Q because mass percentages, %A and %B, form 100% of the compound.
Steps
Change % of each element into grams.Convert grams of each element into moles by dividing grams by molar mass.Divide all moles by the smallest number of moles.If the moles are all whole numbers, then you’re done and that’s your empirical formula.If not, multiply all moles by number such that everything is a whole number.Solving
We have 15.66g of A and 84.34g of ZMoles of A, n(A) = 15.66/15.45 = 1.01 molesMoles of Z, n(Z) = 84.34/41.62 = 2.02 molesA = 1.01/1.01 = 1 and Z = 2.02/1.01 = 2Therefore, the empirical formula is AZ₂If you had 1 mol of Cr7(PO4)3 how many moles of Cr would there be?
How does soil convert the organic matter back to co2
# 1083 of LethalDose
Concentrated hydrochloric acid is 38%, by mass, HCI in water. How
many grams of HCI are there in 25.0 g concentrated hydrochloric acid?
Select one:
O a. 38.0 g
O b.
25.0 g
O c. 16.5 g
O d. 12.0 g
O e. 9.50 g
The amount, in grams, of HCl that are in 25.0 grams of concentrated hydrochloric acid will be 9.5 grams
Percentage contentEvery concentrated HCl contains 38% HCl by mass. This means that 38 grams of HCl would be in every 100 grams of concentrated HCl.
There, for 25.0 grams concentrated HCl, the amount of HCl can be calculated as:
38/100 x 25.0 = 9.5 grams
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A small bar magnet is placed in the magnet field of a larger bar magnet that position marked why in the diagram below assuming the small bar mad and it is free to rotate how would it be positioned
Answer:
See below
Explanation:
The large bar magnet is positioned with S on the Left
the small magnet will position itself similar this with N on the right S on the left (opposites attract)
Stages of elution and regeneration
The resin may be regenerated by washing it again with water and making it safe for use again.
What is elution and regeneration ?Elution and regeneration are important processes in the treatment of water. The waste water is eluted through an ion exchange resin in which exchange of ions takes place.
The resin may be regenerated by washing it again with water and making it safe for use again.
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Please help!!! Only one try. Explain why the answer is the right answer
Which equation is an example of artificial transmutation
Answer:Nitrogen can be transformed into oxygen by bombarding an alpha particle into the nucleus of nitrogen. An atom of hydrogen is produced as part of the transformation. Aluminum is transformed into phosphorous by combining the nucleus with an alpha particle
Explanation:
How much of a 14.0 M HNO3 solution should you use to make 840.0 mL of a 0.300 M HNO3 HNO3 solution?
39200 mL of a 14.0 M [tex]HNO_3[/tex] solution should you use to make 840.0 mL of a 0.300 M [tex]HNO_3[/tex] solution.
What are moles?The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilograms of carbon 12; its symbol is “mol”.
Solution:
[tex]M_1V_1 = M_2V_2[/tex]
In this case, [tex]M_1[/tex] = 840.0 mL, [tex]V_1[/tex]= 14.0 M , [tex]M_2[/tex]= 0.300 M
Substituting the value in the equation:
[tex]V_2[/tex] = [tex]\frac{840.0 X 14.0}{0.300}[/tex]
= 39200 mL
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If 22.5L of nitrogen at 0.98 atm is compressed to 0.95 atm,what is the new volume?
At constant temperature, if the pressure is compressed to the given value, the volume of the nitrogen gas increases to 23.2L.
What is Boyle's law?Boyle's law simply states that "the volume of any given quantity of gas is inversely proportional to its pressure as long as temperature remains constant.
Boyle's law is expressed as;
P₁V₁ = P₂V₂
Where P₁ is Initial Pressure, V₁ is Initial volume, P₂ is Final Pressure and V₂ is Final volume.
Given that;
Initial volume of the gas V₁ = 22.5LInitial pressure of the gas P₁ = 0.98atmFinal pressure of the gas P₂ = 0.95atmFinal volume of the gas V₂ = ?P₁V₁ = P₂V₂
V₂ = P₁V₁ / P₂
V₂ = (0.98atm × 22.5L) / 0.95atm
V₂ = 22.05Latm / 0.95atm
V₂ = 23.2L
Therefore, at constant temperature, if the pressure is compressed to the given value, the volume of the nitrogen gas increases to 23.2L.
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1. Which substance dissolves in water to give a solution with a pH greater
than 7?
A Sulphur dioxide
B Sodium oxide
С Sodium chloride
D Carbon dioxide
Answer: sulphur dioxide
Explanation:
Which part of the heart takes blood from the veins and pumps it into a ventricle?
arteries
ventricles
valves
atria
Answer:
Atria
Explanation:
The part of the heart takes blood from the veins and pumps it into ventricle is called atria
SCIENCE!
Kaila was organizing data about the rise in popularity of computers and internet usage
in the US. She made a table with the percentages of home with computers and internet access. Which of the following is NOT a reason that home computer and internet usage have increased?
A.more options for computer technologies
B.better offsite storage facility and server farms
C.home computers contain better technology and can be cheaper
D.better reliability of data transmissions
How Is Your Mind Related to Your Body
Answer:
The brain and body are connected through neural pathways made up of neurotransmitters, hormones and chemicals. These pathways transmit signals between the body and the brain to control our everyday functions, from breathing, digestion and pain sensations to movement, thinking and feeling.
if 14.0 g of sodium sulfide are reacting how many molecules of sodium chloride will be produced
Explanation:
If 14.0 g of sodium sulfide are reacting, how many molecules of sodium chloride will be produced?
3 Na₂S + 2 AICI36 NaCl + Al2S3
1.08 x 10^23
2.16 x 10^23
2.16 x 10^-23
5.97 x 10^-25
When did Stone become interested in caving?
As a child
In high school
During college
After he was 30 years old
Answer:
William Stone (American Caver) became interested in caving in High school .
13) A gas has an initial state of 500 K, 6.5 atm, and occupies 8.0 L. What will the final volume be if the pressure is kept constant and the temperature is decreased to 150 K?
A gas has a volume of 1400 mL at a temperature of 20.00 K and a pressure
of 101.3 kPa. What will be the new volume when the temperature is
changed to 40.00 K and the pressure is changed to 50.65 kPa?
The question is Given:Gas×Temperature×Pressure
Gas=1400ml
Temperature=20.00K
Pressure=101.3kpa
140ml×20.00K×101.3 K Pa
total =6,00.00
and when the volume of temperature changed to 40.00 K and the pressure is changed to 50.65 kPa.
Solution will 40.00 K× 50.65 kPa
total of the changes is 200.
CCC Matter and Energy The dashed curve shows
the average amount of radiation emitted by each
square meter of Earth's surface. On its way up,
some of that energy is absorbed or scattered by
the atmosphere. The solid curve shows the amount
that would be observed looking down from the
"top of the atmosphere" (TOA). Explain why there
are "dips" in that curve.
The amount of absorption force is not same at all time and at all where .
It has difference at different time periods
So during those the curve goes up and down and repeat this flow
So there are dips
Which type of solid conducts electricity the best?
• Ionic
• Molecular
• Network
• Metallic
Which reason explains why the boiling point of water (H2O) is higher than the boiling point of hydrogen sulfide(H2S)
Options:
Ionic bonding
Covalent bonding
Hydrogen bonding
London dispersion forced
Describe the population density located along the tectonic plate boundary known as the Ring of Fire and the potential effect that earthquakes or volcanic
activity can have in this area.
(Pls no links)
Population density is the number of specific organisms living in a particular area. The tectonic plate movements in the Ring of Fire area can cause volcanic eruptions and earthquakes.
What are tectonic plates?Tectonic plates are the parts of the crust and the mantle of the earth layer that is also called the lithosphere plate. They are not stationary and have slight movements on the mantle which comprises the hot lava.
The movement of these tectonic plates in the area of the Ring of fire causes the eruption of the lava and disrupts the crust causing an earthquake. This consequence affects the life habiting them.
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Answer:
im pretty sure because the plates move which causes these natural disasters
Explanation:
Which explanation describes the last part of a chemical reaction?
Reactants collide to form a transition state.
Transition state falls apart to form products.
Products collide to form reactants.
Reactants collide to form products.
I am not sure between Reactants collide to form a transition state and Transition state falls apart to form products. please put an explanation.
Answer:
Transition state falls apart to form products.
Explanation:
Reactants collide to form a transition state is actually the initial step (not the last step) because reactants have react with each other. Transition state is the middle stage, once this stage falls or passes, you get products. I have attached an example reaction scheme to better understand.
What is the pH of a 4.2 x 10^-3 solution of HCl?
Answer:
pH = 2.38
Explanation:
Recall that HCl is a strong acid and hence dissociates completely into H⁺ and Cl⁻ ions. Thus, the solution's H⁺ concentration is equivalent to the acid concentration. That is, [H⁺] = 4.2 × 10⁻³ M.
Therefore, the pH of the solution is:
[tex]\displaystyle \begin{aligned}\text{pH} & = -\log[\text{H}^+] \\ \\ & = -\log (4.2\times 10^{-3}) \\ \\ & = 2.38\end{aligned}[/tex]
Answer:
HCl + H[tex]\\ 2[/tex]O —> Cl- + H[tex]\\ 3[/tex]O+
pH = -log [H[tex]\\ 3[/tex]O+] = -log [4.2 x 10^-3] = 2.38
—
We assume that hydrochloric acid will undergo complete dissociation in water to give stoichiometric H3O+ ion, according to the given reaction.
—
Have a nice day!!
According to one acid base theory the water acts as ?
