Answer: There are 3.3×1023atoms in 0.54 moles Pb. Explanation: To calculate the number of atoms in Pb, we use Avogadro's number,
Explanation:
8 billion molecules of O2 gas
help please
Assuming that the trends continue, which of the following compounds do you predict will have the GREATEST solubility at 120°C?
A.
Ce2(SO4)3
B.
K2Cr2O7
C.
Pb(NO3)2
D.
NaCl
Answer:
K2Cr2O7
Explanation:
Solubility refers to the amount of substance that dissolves in a given mass or volume of solvent. There are several units of solubility applicable in different areas.
Solubility is dependent on temperature. The solubility curve is a graphical representation of the dependence of solubility on temperature for different chemical species.
If we study the solubility curve closely, we will see that K2Cr2O7 has the highest solubility at 100°C. This means that if the trends continue, this substance will also have the highest solubility at 120°C.
Answer: c
Explanation:
why water wet glass
Answer:
because water wets stuff expect for fire.
Answer:
The meaning of wet is covered or saturated with water or another liquid, showing that is a glass is covered in water it is considered wet.
Explanation:
why should we put a glass on candles for experiments and why should we put candles on sand trays ?
Answer:
1, you should use candles for experiments because, You created an area of low pressure! When the experiment is run you can see tiny bubbles escaping under the glass which shows that the increased air pressure from the heated air as the candle burns. Once the candle runs out of oxygen, the candle burns out and the remaining air inside cools down.
2. you should put candles on sand trays, Pour layers of sand into a glass vase, alternating colors with each layer. For a more interesting look, try uneven layers in various heights. Keep layering sand until you're a few inches from the top of the vase. Place your votive candle in the center of the sand.
Explanation:
its scientific proven
Interpret: Since hot packs release heat, you might assume that cold packs release cold. Use the definition of endothermic to explain why this view of cold packs is not accurate.
Answer:
Endothermic means: accompanied by or requiring the absorption of heat. So therefor cold packs would not be endothermic because they don't release cold. Instead they absorb heat
Explanation:
Answer:
Explanation:
Endothermic means accompanied by or requiring the absorption of heat, this view is not accurate because cold absorbs heat.
How do metamorphic rocks form?
A) Heat and pressure
B) Cooled magma or lava
C) Compaction and cementation
D) Melting
Answer: The answer is A heat and pressure
Explanation:
Write the number 2.36 × 10-4 in expanded form.
Answer:
0.000236
Explanation:
Move the decimal point 4 times to the left of its original position
If I add 25mL of water to 125 mL of 0.25 M NaOH solution, what will the molarity of the diluted solution be?
Answer:
0.208333 M
Explanation:
M2=M1V1/V2=(0.25 M)(125mL)/(125mL+25 mL)= 0.208333 M
Please help me with this chem question, I’ll mark you brainiest if it’s right. There’s multiple answers for this one.
Cant be B) or C)
Answer:
Option A. KCl (aq)
Option D. Mg(OH)₂(s
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
MgCl₂(aq) + KOH(aq) —>
In solution, MgCl₂(aq) and KOH(aq) will dissociate as follow:
MgCl₂(aq) —> Mg²⁺(aq) + 2Cl¯(aq)
KOH(aq) —> K⁺(aq) + OH¯(aq)
MgCl₂(aq) + KOH(aq) —>
Mg²⁺(aq) + 2Cl¯(aq) + 2K⁺(aq) + OH¯(aq) —> 2K⁺(aq) + 2Cl¯(aq) + Mg(OH)₂ (s)
MgCl₂(aq) + KOH(aq) —> 2KCl (aq) + Mg(OH)₂(s)
Thus, the products of the above reaction are: KCl(aq) and Mg(OH)₂(s)
Thus, option A and D gives the correct answer to the question.
how many grams of AgNO3 (MM=169.87) are needed to prepare 0.125 M solution in 250 mL of water?
a. 0.5 g
b. .03 g
c. 5.3 g
d. 84.9g
Answer:
Correct answer-C 5.3g
Explanation:
Molarity = no. of moles of solute/ volume of of solution in litre
olarity = no. of moles of solute/ volume of of solution in litreno of moles of solute = 0.125×0.25=0.03125
olarity = no. of moles of solute/ volume of of solution in litreno of moles of solute = 0.125×0.25=0.03125one mole AgNO3 weighs 169.87 gm,
olarity = no. of moles of solute/ volume of of solution in litreno of moles of solute = 0.125×0.25=0.03125one mole AgNO3 weighs 169.87 gm,so the mass of 0.03125 moles of AgNO3 = 0.03125×169.87= 5.3084g
The grams of AgNO₃ are needed to prepare 0.125 M solution in 250 mL of water is 5.3 grams.
How do we calculate mass from moles?Moles is a unit which is used to define any amount and it is calculated as:
n = W/M, where
W = required mass
M = molar mass
Given molarity of AgNO₃ = 0.125 M
Volume of water = 250mL = 0.25L
moles (n) from the molarity (M) will be calculated as:
n = M × V
n = (0.125)(0.25) = 0.0312 moles
Now we calculate the mass of AgNO₃ by using the above formula as:
W = (0.0312mol)(169.87g/mol)
W = 5.30 g
Hence option (c) is correct.
To know more about moles, visit the below link:
https://brainly.com/question/15374113
How many moles are there in 321g of silver hydroxide?
Need to show my work so please show how you got it
Pls help really need it pls
The specific heat of water is 4.184Jg ∘C. Determine the final temperature when 600.0 g water at 75.5∘C absorbs 5.90×104 J of energy.]
Answer:
[tex]T_2=98.5^{\circ}[/tex]
Explanation:
Given that,
The specific heat of water is 4.184Jg°C
Mass, m = 600 g
Initial temperature, T₁ = 75.5°C
We need to find the final temperature. We know that heat absorbed is given by :
[tex]Q=mc\Delta T\\\\Q=mc(T_2-T_1)\\\\\dfrac{Q}{mc}=(T_2-T_1)\\\\\\T_2=\dfrac{Q}{mc}+T_1\\\\T_2=\dfrac{5.9\times 10^4}{600\times 4.184}+75\\\\T_2=98.5^{\circ}[/tex]
So, the final temperature is equal to [tex]98.5^{\circ}[/tex].
1. Suppose you have 1.00 mol of liquid water at 0.0 C and add just enough heat to bring the
temperature of the water to 100.0 °C, but no more heat is added. How much heat was added?
Answer: Heat Q = m·c·ΔT
Explanation: Mass of 1.00 mol water m= 18.016 g. Heat capacity of water is
c= 4.19 J/( g K) and change of temperature ΔT= 100 K
If $350 is shared in the ratio of 2:5, the SMALLER share is
Answer:
$100
Explanation:
550/7=50
50×2=100
How does catalysts make its way to common usage?
Which of the following is the car average speed?
Answer:
it would be 100 km/hr
Explanation:
if you divide each speed by the time you get 100 each time
8. (a) What is an acid-base indicator?
Answer:
Acid–base indicators are generally weak protolytes that change color in solution according to the pH. The acid–base equilibrium of a weak acid type of indicator (HI) in water can be represented as. [I] The acid, HI, and the conjugate base, I−, have different colors. The equilibrium expression for this process is.
Explanation:
Y’all where do I match cooling, settling, and pressure with ?? (Plz answer correctly only if u know how to do it) thx :3!!
WILL MARK BRAINLIEST WHOEVER ANSWERS FIRST :DDD..PROMISE!
Answer:
Cooling is at the bottom, Pressure is in the middle, and Settling is at the top
1. A 1500kg car is being lifted by a hydraulic jack attached to a flat plate. Underneath the plate is
a pipe with radius 24cm.
a) If there is no net force on the car, calculate the pressure in the pipe.
Answer:
the pressure in the pipe in the case when there is no net force on the car is 81,726 N/m^2
Explanation:
a. The computation of the pressure in the pipe in the case when there is no net force on the car is shown below
As we know that
Pressure = F ÷ area
Also
F = mg
Now
= (1500 × 9.8) ÷π (0.24)^2
= 81,726 N/m^2
Hence, the pressure in the pipe in the case when there is no net force on the car is 81,726 N/m^2
why would a percent yield be less than 100%? give a reason
Answer:
Usually, percent yield is lower than 100% because the actual yield is often less than the theoretical value. Reasons for this can include incomplete or competing reactions and loss of sample during recovery. ... This can happen when other reactions were occurring that also formed the product.
Explanation:
what is the scientific method
gn guys I'm finna go now byeee
The scientific method is an empirical method of acquiring knowledge.
These are the 5 scientific methods:
Make observations Ask questionsForm hypothesis make a predictionExamineI NEED HELP, PLEASE AND THANK YOU! <3
The doctor speaks to his patients in a soothing voice, maintains eye contact, and is aware of his body language. Which best describes what these actions will do for the patients?
allow for successful communication between diverse cultures
allow for greater chance of stereotyping patients
allow for an increase in misdiagnosis
allow for greater chances for a sentinel event
Answer:allow for greater chances for a sentinel event
Explanation:
Answer:
The last one
Explanation:
To much eye contact may cause discomfort to the patient. I mean like looking at the client is good but with out a blink breaking is weird.
What is the mass of 5.2 moles of Fe?
Answer:
279.225g
Explanation:
How many grams are in 4.00 moles of Cr2O3?
Answer:
607.9616 grams
Explanation:
Fill in the Blanks :
1) Number of Proton + Number of Neutron is the ________ of an element.
2) A-Z indicates the number of _______ in the nucleus of an atom.
3) Z = number of protons in the nucleus of an atom = number of _____ in a neutral atom.
Answer:
Explanation:
1. Mass number
2. Protons
3. Electrons
can someone please go answer my last question
Answer:
Done and done
Explanation:
1. A typical home instant pot has an internal volume of 6.5 Liters. If the steam inside an instant pot with an internal pressure of 191.0 kPa and a temperature of 750.0 K was released into the atmosphere at 101.3 kPa and 298K, what volume with the steam occupy in the atmosphere?
2. Even though the pressure was reduced by nearly half in the scenario above, the volume of the gas decreased. Explain why. Support your answer with evidence and scientific reasoning.
Answer:
Q.1
Given=
V1=6.5ltr
P1=191.0kPa
T1= 750.pK
P2= 101.3kpa
T2= 298K
V2=?
Combined gas law: P1V1/T1 = P2V2/T2
Use the gas laws for pressure, volume and temperature calculations
Now,
191.0×6.5/750= 101.3×V2/298
V2 = 191.0×6.5×298/750×101.3
On solving further
V2 = 4.86 ltr!
4.86 volume with the steam occupy in the atmosphere!
Q.2
Scientific Reasoning:-
Temperature is directly to proportional to the pressure in second scenario the temperature was reduced to nearly half of the first one hence the pressure also decreased simultaneously, and we all know according to charles law The volume of a given gas sample is directly proportional to its absolute temperature so the decreasing temperature affected the amount of volume that decreased!
Which option identifies what might change Larry's mind in the following scenario? Larry is not interested in participating in his neighborhood's recycling program because he thinks it is too much of a hassle. offering a dual-stream recycling program o providing bins for each recyclable material O simultaneous trash and recycling collection offering a single-stream recycling program Save and Exit Mark this and return Sign
Answer:
providing bins for each recyclable material could change Larry's mind, coz in return of unnecessary things of household she's getting bins in return so she might get interested!
What type of reaction is illustrated?
2S03 —> 2S02 + O2
Answer:
synthesis reaction
Explanation:
synthesis reaction where reactants unite to form a single product.
