Answer:
B
Explanation:
What is the pH of a 0.30 M solution of Ca(OH)2?
Explanation:
30 to the second power
4. What is the volume of 6.5 moles of Helium at STP?
|
Answer:
Volume of 6.5 moles of Helium at STP is 145.6954 L
Explanation:
As we know
[tex]pV = nRT[/tex]
At STP, temperature is 273.15 K and pressure is 1 atm
n is the number of moles which is equal to 6.5
R is the gas constant = 0.08206 L atm/K mol
Substituting the given values in above equation, we get -
[tex]1 * V = 6.5 * 0.08206 * 273.15\\V = 145.6954[/tex]Liters
Volume of 6.5 moles of Helium at STP is 145.6954 L
Which on is right O& Mg?
OMG
MgO
Mg2O2
Mg+2O-2
Answer:
MgO
is the correct answer
hope it helps
A pool float was filled with air to capacity in the middle of a hot day. The next morning the pool float looked different yet no gas escaped or entered the float. Describe what you think the float looked like in the morning and why it occurred.
Answer:
The pool float looked would have looked deflated the next morning.
Explanation:
When temperature decreases the volume decreases
Answer:
The pool float most likely looked a little deflated or pushed in
Explanation:
The pool float most likely looked a little deflated or pushed in. This is because during the night temperatures most likely dropped. These cold temperatures during the night would have caused the air molecules inside the pool float to come closer together which would cause there to be more excess space inside the pool float. Therefore, allowing it to collapse into itself. This would be far worse if the float was filled with helium or another gas other than O2.
2 H2 (g) + O2 (g) --> 2 H2O (l)
How many moles of hydrogen gas do you need to make 2 moles of liquid water?
Answer:
2H2(g]+O2(g]→2H2O(l]]. Notice that the reaction requires 2 moles of hydrogen gas and 1
Explanation:
What is the normality of a 2.0 M NaOH solution?
Answer:
Normality= molarityX total POSITIVE oxidation number of solute Solvent=substance present in the greatest amount Solute= all other substances in the solution +1 (1 na+) is the total POSITIVE oxidation number of NaOH 2.0X1= 2.0 N=2.0
Explanation:
I had the same question on one of my assignments earlier
What is the empirical formula for a compound that has 1.5 moles of copper and 0.5 moles of phosphorus?
Answer:
[tex]Cu_{3}P[/tex]
Explanation:
usually, the first step is to calculate the moles but since that is already given in the question we can move onto the next step
least molar ratio:
Cu = [tex]\frac{1.5}{0.5}[/tex] = 3
P = [tex]\frac{0.5}{0.5}[/tex] = 1
thus, empirical formula = [tex]Cu_{3}P[/tex]
The empirical formula for a compound that has 1.5 moles of copper and 0.5 moles of phosphorus is Cu₃P.
What is the empirical formula?Empirical formula of any compound gives idea about the number of constituents particles present in that compound by mentioning the ration.
In the question, given that:
Moles of copper = 1.5 moles
Moles of phophorous = 0.5 moles
Now we divide the given moles by the smallest number to get the ration number as follow:
Cu : P
1.5/0.5 : 0.5/0.5
3 : 1
Hence, required empirical formula is Cu₃P.
To know more about empirical formula, visit the below link:
https://brainly.com/question/1603500
When hydrogen peroxide (H2O2) is used in rocket fuel, it produces water and oxygen (O2): Can someone help with parts B and C?
Answer:
Explanation: A foam forms when bubbles of a gas are trapped in a liquid or solid. In this case oxygen is generated when hydrogen peroxide breaks down into oxygen and water on contact with catalase, an enzyme found in liver. Enzymes are special protein molecules that speed up chemical reactions.
Please please help me!! It needs to be turned in in a few minutes!
Answer:
D. Thermal
Thermal is another energy the match gives off
A box slides with an initial speed of 4.0 towards a spring on a frictionless horizontal surface. When the box
S
N
hits a spring with spring constant k = 150 the spring compresses by 0.30 m.
m
m
M
What is the mass of the box?
Answer: .84kg
Explanation:
Khan academy
A box slides with an initial speed of 4.0 kg m/s towards a spring on a frictionless horizontal surface. When the box hits a spring with spring constant k = 150 N/m, the spring compresses by 0.30 m.
What is the mass of the box?
Answer: 0.54 kg
How many grams of NaOH are produced from 2.1g of Na2O?
Na2O + H20 --> 2NaOH
Answer:
2.72g
Explanation:
The balanced equation of this reaction is given as follows:
Na2O + H20 --> 2NaOH
Based on this balanced equation, 1 mole of Na2O will produce 2 moles of NaOH.
First, we need to convert mass of Na2O into moles by using the formula;
mole = mass/molar mass
Molar mass of Na2O = 23(2) + 16
= 46 + 16
= 62g/mol
mole = 2.1g/62g/mol
mole of Na2O = 0.034mol
Hence, if 1 mole of Na2O will produce 2 moles of NaOH.
Then, 0.034mol of Na2O will produce (0.034 × 2) = 0.068mol of NaOH.
To convert mole of NaOH to mass, we use;
mole = mass/molar mass
Molar mass of NaOH = 23 + 16 + 1 = 40g/mol
0.068 = mass/40
mass of NaOH produced = 2.72g.
Horticulture 100 POINTS Hurry
Which of the following is an example of an indirect expense?
A. corn oil
B. animal fodder
C. export commodity
D. snack foods
Answer:
B!
Explanation:
Answer:
i know im late but i just really want the points. the answer is b.
Explanation:
You heat 100 mL of water and 1000 mL of water using 40,000 joules of energy. What would be the outcome of this experiment? *
A. The 100 mL of water would be a higher temperature than the 1,000 mL of water.
B. The 100 mL of water would be a lower temperature than the 1,000 mL of water.
C. They would both be the same temperature.
D. There is not enough information
Answer:
A. The 100 mL of water would be a higher temperature than the 1,000 mL of water.
Explanation:
Since the volume of water affects temperature, when the volume increases this results in a lower temperature. This means that the water with the smaller volume will have a higher temperature.
What happens to food we eat?
Answer:
It goes through our digestive system then though our bladder.
Answer: When we eat the food gets digested.
Explanation: Once filled with food, the stomach grinds and churns the food to break it down into small particles. It then pushes the small particles of food into the first part of the small intestine, called the duodenum. The small intestine is where most of the digestion and absorption of our food takes place.
Which substances are compounds? Please help
Answer:
1 and 3
Explanation:
oh this one lol,, hope it helps
Answer:
1 and 3
Explanation:
hope this helps :)
pls help and show work!!!
Answer:
44.9g
Explanation:
You have to convert grams of CH4 to moles, use the mole-to-mole ratio of CH4 to water, and convert back to grams.
(20.0g CH4)(1 mol CH4/16.04g)(2 mol H2O/1 mol CH4)(18.01 g H2O/ 1 mol) = 44.9127 g
Hope this helps!
6. Find the number of molecules in 33.6 L of co, at STP? What is the name
of this compound?
!!!!!!PLEASE HELP!!!!!!!!!!
Which of the following is a property of elements?
O
Elements have at least two different types of atoms.
Elements have their own individual characteristic properties.
Elements are can be separated from one another.
Elements have the ability to change into a different element.
How are Earth;s Days, Years, and Season’s related to the way Earth moves in Space?
A car with a mass of 3,500lbs accelerates negatively from 35m/s to 8m/s in 8s. What is the
car's negative acceleration?
Answer:
[tex]a=-3.37\ m/s^2[/tex]
Explanation:
Given that,
A car accelerates negatively from 35m/s to 8m/s in 8s.
We need to find the car's acceleration.
Initial speed, u = 35 m/s
Final speed, v = 8 m/s
Time, t = 8 s
The acceleration of an object is equal to the rate of change of velocity. So,
[tex]a=\dfrac{v-u}{t}[/tex]
Put all the values,
[tex]a=\dfrac{8-35}{8}\\\\a=-3.37\ m/s^2[/tex]
So, the acceleration of the car is equal to [tex]-3.37\ m/s^2[/tex].
Calculate the molar mass of HCI.
2-ciclopropilpropano
Answer:
cool
Explanation:
What type of ionic compound is CO3?
Answer:
Carbon Trioxide
Explanation:
Its a Carbonite Ion which is also known as a polyatomic ion
what is molarity ? also write its formula ?
Answer:
Definition:
Molarity of a given solution is defined as the total number of moles of solute per litre of solution. The molality of a solution is dependent on the changes in physical properties of the system such as pressure and temperature as unlike mass, the volume of the system changes with the change in physical conditions of the system. Molarity is represented by M, which is termed as molar. One molar is the molarity of a solution where one gram of solute is dissolved in a litre of solution. As we know, in a solution, the solvent and solute blend to form a solution, hence, the total volume of the solution is taken.
Formula :
[tex]m \: = \frac{n}{v} [/tex]
Where,
m = molar concentration
n = moles of solute
v = litres of solution.
How many moles are in 3.4*10²⁶ molecules of H2O?
Answer:
564.5027395 moles
Explanation.
a mole is 6.023×1023
(3.4×10^26)÷(6.023×10^23)= 564.5027395
An electric car has a mass of 2,000 kg. the engine is producing a force of 3,500 N to move the vehicle forward,but it must overcome air friction equal to 500 N
What is the acceleration of the electric car m/s2?
record your answer and fill in below
Answer:
1.5 m/s²
Explanation:
From the diagram,
F-F' = ma............... Equation 1
Where F = Forward force of the vehicle, F' = Frictional force, m = mass of the electric car, a = acceleration of the car.
make a the subject of the equation
a = (F-F')/m........... Equation2
Given: F = 3500 N, F' = 500 N, m = 2000 kg
Substitute into equation 2
a = (3500-500)/2000
a = 3000/2000
a = 1.5 m/s²
4Fe+3O2 →2Fe2O3
80.0 grams of iron are reacted with 50.0 grams of oxygen gas. Which of these reactants are the limiting reactant, and how many grams of iron (III) oxide would be produced?
Answer:
FFe
2
O
3
(
s
)
+
3
CO
(
g
)
→
2
Fe
(
s
)
+
3
CO
2
(
g
Explanation:
What makes an atom stable?
a. Having the nucleus in the center
b. Being very small
c. Being neutral
d. Having the right number of protons and neutrons
How many moles are in 564 grams of copper
Answer:The answer is 63.546.
Explanation: The answer is 63.546. We assume you are converting between grams Copper and mole. You can view more details on each measurement unit: molecular weight of Copper or mol. The molecular formula for Copper is Cu. The SI base unit for amount of substance is the mole. 1 grams Copper is equal to 0.015736631731344 mole
Answer:
5.64 of copper
Explanation:
Given: 564 grams of copper
To find: in copper
Solution: If 1 grams Copper = 0.01 mole,
Then, 564 grams = multiply 564 and 0.01 mole
564 × 0.01 = 5.64
Therefore, there are 5.64 of copper in 564 grams
Define the term metal ore
Answer:
Ore is a deposit in Earth's crust of one or more valuable minerals. The most valuable ore deposits contain metals crucial to industry and trade, like copper, gold, and iron
The naturally occurring material from which a mineral or minerals of economic value can be extracted.