Answer:
0.140mol/dm^3.
Explanation:
200cm3 = 0.2dm^3.
0.2dm^3 * 0.200mol/dm^3 = 0.040mol
300cm^3 = 0.3dm^3
0.3dm^3 * 0.100mol/dm^3 = 0.030mol
The number of moles is 0.070mol of HCl (aq).
The volume of the solution is 0.5dm^3.
Hence the concentration is 0.140mol/dm^3.
The concentration is 0.140mol/dm³.
What is concentration?The concentration of solution is the amount of solute that are dissolved in solution.The concentration can be measured by dividing the weight of solute in grams to the volume of solution.200cm³ = 0.2dm³
0.2dm³ x 0.200mol/dm³= 0.040mol
300cm³ = 0.3dm³
0.3dm³ x 0.100mol/dm³ = 0.030mol
The number of moles is 0.070mol of HCl
The volume of the solution is 0.5dm³
Concentration = Number of moles/volume in dm³
= 0.070mol/0.5dm³
= 0.140mol/dm³
Hence, the concentration is 0.140mol/dm³
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b. 239/94 Pu 4/2 He +
Answer:
im thinking its 362x
Explanation:
5(3x)-7y2=?,when x=3 and y =2
Answer:
17
Explanation:
We are given the equation:
[tex]5(3x)- 7y^2[/tex]
and asked to solve when x=3 and y=2. Therefore, we must plug 3 in for x and 2 in for y.
[tex]5(3(3))-7(2)^2[/tex]
Solve according to PEMDAS: Parentheses, Exponents, Multiplication, Addition and Subtraction.
Solve the exponent first.
⇒ (2)²= 2*2=4
[tex]5(3(3))-7(4)[/tex]
Multiply 3 and 3.
⇒3*3=9
[tex]5(9)-7(4)[/tex]
Multiply 5 and 9.
⇒5*9=45
[tex]45-7(4)[/tex]
Multiply 7 and 4.
⇒ 7*4=28
[tex]45-28[/tex]
Subtract 28 from 45.
[tex]17[/tex]
5(3x)-7y² when evaluated for x=3 and y=2 is 17
what method is suitable to determine whether barium is more reactive than calcium
Answer:
by looking at the number of electrons in the outermost shell of an atom determines its reactivity (the number on top of the column)
Explanation:
calcium and barium are both in column 2, since barium is located further in the column, it's more reactive
plus barium also have a larger mass than calcium
The following properties are either physical or chemical. Which one is different from the rest based on those two categories?
Answer:
Boiling point: physical
Density: physical
Ductility: physical
Heat of combustion: chemical
Explanation:
Chemical properties can only be analyzed by putting the substance through a chemical reaction, such as combustion.
Physical properties can be analyzed without altering the substance chemically. With that in mind:
Boiling point is the physical property, density is the physical property, ductility is also a physical property but combustion of heat is a chemical property.
What is physical and chemical property?A physical property is the characteristic of a substance or compound that is observed without any change in the identity of the particular substance.
The physical properties of a substance is its colour, hardness, density, and melting as well as boiling points.
A physical property is a characteristic of matter that involves in physical change and physical changes are reversible and there is no production of any new substance.
The chemical change is the property of a substance due to which new substances are formed and it is non reversible change.
The chemical properties are flammability, toxicity, heat of combustion, coordination number, enthalpy of formation, and oxidation states.
Therefore, Boiling point is the physical property, density is the physical property, ductility is also a physical property but combustion of heat is a chemical property.
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Air is a mixture because it is colorless when unpolluted. Why is this statement
wrong?
Explanation:
Air is indeed a mixture but the reason is wrong. It is because there can be different concentrations of gases in the air to give the mixture of air, such as nitrogen, oxygen and carbon dioxide.
Answer:
The statement is wrong because air is already colorless when unlimited because when it is polluted.it is not air but it is carbon and methane with oxygen so we cannot say it air.
Determine which physical properties are being described.
a. Copper wire is used to transfer electricity.
b. There are 19.3 grams of gold in one cubic centimeter.
c. Iron turns to liquid at 1,534.85°C. Silver is very easy to bend.
d. Fluorite is a green crystal.
Answer:
Explanation:
a. Copper wire is used to transfer electricity.
Physical property : Electrical conductivity .
b. There are 19.3 grams of gold in one cubic centimeter.
Physical property : Density
c. Iron turns to liquid at 1,534.85°C.
Physical Property : Melting point
d. Fluorite is a green crystal.
Physical property : Colour .
Answer:
Explanation:
A: Conductivity
B: Density
C: Melting point
D: Hardness
E: Color
What is the TLV for sodium hydroxide? Will mark brainliest!
Answer:
you could've googled it but here.
Explanation:
The former OSHA limit for sodium hydroxide (also known as caustic soda or Iye) was 2 mg/m3 as an 8-hour TWA. OSHA proposed a 2-mg/m3 ceiling limit for sodium hydroxide, based on the ACGIH- and NIOSH-recommended limits.
How many grams are in 160 lbs ?
what is the molar mass (g/mol) of cyclohexanol
Explanation:
Molar mass of cyclohexanol : 100.158 g/mol
Which of these is a property of acids? Question 1 options: They taste sour. They turn litmus paper blue. They feel slippery. They typically contain an -OH group.
Answer:
C , They taste sour
Answer:
They taste sour
Explanation:
I know it's late but i couldnt help it i just took the test
What is a better conductor of electricity? Copper Iron Nickel Aluminum
Which statement describes how chemical formulas, such as H2O, represent compounds
Answer: B
Explanation:
Answer:
They show the elements that make up a compound.
Explanation:
Got it right 100% right
what is symbol, molecule, electrovalent compound?
Answer:
the abbreviation form of full name is called symbol.
the smallest unit of cimpound is called molecule.
when calcium carbonate is heated two new substances calcium oxide and carbon dioxide are formed................write a word equation for the above chemical reaction
Answer:
CaCO3------->CaO + CO2
Heat
Help please! List the six steps in the scientific method. Beside them list the nine components of a lab report.
If an automobile slows from 26 m/s to 18 m/s in a period of 4.0 s, what was the average acceleration? a. %005.7 m/s2 b. 4.0 m/s2 c. 7.0 m/s2 d. %002.0 m/s2
Answer:-2.0
Explanation:
If an automobile slows from 26 m/s to 18 m/s in a period of 4.0 s, the average acceleration is 2.0
what is acceleration ?Acceleration can be defined as the vector quantity and has both magnitude and direction, it is a second derivative of position with respect to time and it is the first derivative of velocity with respect to time.
The change in the velocity of an object called as acceleration and the Velocity is a vector quantity with both magnitude and direction.
Acceleration can be a change in the direction of an object. For example, while pressing the accelerator of car makes the car go faster.
Acceleration(a)= final velocity(v) –initial velocity(u) time(t)
The velocity at the beginning was ‘u′, and the increased to velocity, ‘v′, after "t" time .
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The independent variable has control and affects the
Answer:
The independent variable is the condition that you change in an experiment. It is the variable you control.
Explanation:
It is called independent because its value does not depend on and is not affected by the state of any other variable in the experiment. Sometimes you may hear this variable called the "controlled variable" because it is the one that is changed.
What is the mass of a neutron?
A) 1/2,000 amu
B) 1 amu
C) 2,000 amu
D) 1/200 amu
Answer:
B) 1 amu
Explanation:
Why did the Boeing 767 crew need to do a density calculation? What was wrong
with theircalculation?
Answer:
Their calculation was way too off to the actual one.
Explanation:
Answer:
They need a density calculation so they can get the right vaule. Their calculation was way off compare to the acutal vuale.
Explanation:
Name a plant in which leaf is modified into tendril
Answer:
yellow vetch
Explanation:
A florist prepares a solution of nitrogen-phosphorus fertilizer by dissolving 5.66 g of NH4NO3 and 4.42 g of (NH4)3PO4 in enough water to make 17.0 L solution. What is the molarity of NH4+ in the solution?
Answer:
9.39x10⁻³M NH₄⁺
Explanation:
To find molarity of NH₄⁺ we need to calculate moles of NH₄⁺ that comes from NH₄NO₃ and (NH₄)₃PO₄
Moles from NH₄NO₃ (Molar mass: 80.043g/mol):
5.66g * (1mol / 80.043g) = 0.0707 moles NH₄NO₃ = Moles NH₄⁺
Moles from (NH₄)₃PO₄ (Molar mass: 149.09g/mol):
4.42g * (1mol / 149.09g) = 0.0296 moles (NH₄)₃PO₄ * 3 = 0.0889 moles NH₄⁺
Total moles NH₄⁺:
0.0707 moles + 0.0889 moles = 0.1596 moles NH₄⁺ in 17.0L
Molarity: 0.1596 moles / 17.0L =
9.39x10⁻³M NH₄⁺Jennifer is making pies to serve at the family picnic. If each pie serves 6 people, how many pies will be needed to serve 60 people at the picnic?
Answer:
10
Explanation:
10 pies because 60 divided by 6 is 10.
A solution containing a mixture of lactic acid and lactate was found to have a pH of 4.26. Calculate the ratio of the lactate concentration to the lac
Given :
pH of solution of mixture of lactic acid and lactate is 4.26 .
To Find : [tex]log( \dfrac{[ \text{Conc. of lactate}]}{[\text{Conc . of lactic acid }]}) = 0.4[/tex]
The ratio of the lactate concentration to the lactate .
Solution :
We know , pKa of lactic acid is :
pKa = 3.86 .
Now , the solution of lactic acid and lactate is a buffer solution .
So , pHof buffer acid is given by :
[tex]pH=pKa+log(\dfrac{[Salt]}{[Acid]})[/tex]
Putting all given values :
[tex]log( \dfrac{[ \text{Conc. of lactate}]}{[\text{Conc . of lactic acid }]}) = 0.4[/tex]
Taking anti log both the sides , we get :
[tex]\dfrac{[ \text{Conc. of lactate}]}{[\text{Conc . of lactic acid }]} = 2.51[/tex]
Therefore , the ratio of the lactate concentration to the lactate is 2.51 .
Hence , this is the required solution .
Can someone help me with this i don't understand it.
Answer:
The subscript next to the letter "C" will always tell you the number of carbon atoms.
The following properties are either physical or chemical. Which one is different from the rest based on those two category? A.) Density B.) Appearance C.) Color D.) Reactivity
Answer:
A.)physical B.)physical C.)physical D.)chemical
Put 5.1 x 10^-7 into standard notation.
Answer:
My answer to the question is 0.00000051
Answer:
0.00000051
Explanation:
A wind turbine is used to convert wind energy into electricity. If you want to increase the efficiency of the turbine, which of these would most likely help increase the speed of the turbine?
Answer:
Wind turbines work on a simple principle: instead of using electricity to make wind—like a fan—wind turbines use wind to make electricity. ... water) or a generator can convert this mechanical power into electricity.
Explanation:
I hope this helps!
Convert 48.66 L to daL
You travel by express Greyhound bus from Indianapolis, IN to Tampa, FL; this is a distance of 1,070 miles. With no stops, the trip takes 16 hours. What is the average speed (nearest whole number)? a) 45 mi/h b) 55 mi/h c) 90 mi/h d) 67 mi/h
PLEASE HELP <3.
D, 67
Explanation:
1070 miles/16 hours = 66.875 miles per hour average traveling speed, which rounds up to 67.
Express the following numbers in scientific notation:
1. 0.00125
2.
2,000,000,000
3. 796,000
Express the following numbers in scientific notation