Answer:
is exothermic
Explanation:
releases energy to the atmosphere
Which example is not a structural adaptation of animals?
NEED HELP ASAP
A. a tortoise shell to protect from predators
B. wings on a bird to get food and escape predators
C. a seal's thick fat to keep it from freezing
D. gosling following their mother to stay protected
How many moles of sodium chloride are required to prepare 500.0 mL of a 0.100 M solution?
Molarity=Moles/Liter
0.1M solution=x moles NaCl/0.5L (since 1000mL is one liter)
Multiply both sides by 0.5 to isolate the variable x
x=0.05 moles of NaCl is needed to maintain that molarity.
Answer:
0.0500 mol
Explanation:
0.100 M solution means that 0.100 mol of NaCl are in 1L=1000 mL solution.
(0.100 mol/1000 mL) * 500 mL = 0.0500 mol
the amount of matter in an object is called
Answer: Matter
Explanation:
Matter is anything that has volume and/or mass.
What is activation energy
Answer:
Activation energy is the energy that's provided to a chemical or nuclear system, whichever one, with reactants to get a result of a chemical reaction or a nuclear, or many other reactions. Well that's what I know, I tried(:
Explanation
Well that's what I know, I tried(:
Calculate the molarity of a solution containing 0.2 mol of sodium hydroxide dissolved in 0.5 L of water. Be sure to report your answer in proper significant figures and use the appropriate symbol.
Answer:
The molarity is 0.4 [tex]\frac{moles}{liter}[/tex]
Explanation:
The Molarity (M) or Molar Concentration is a concentration unit that indicates the number of moles of the solute per liter of solution. In other words, molarity is defined as the number of moles of solute that are dissolved in a given volume.
The Molarity of a solution is determined by the expression:
[tex]Molarity (M)=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units ([tex]\frac{moles}{liter}[/tex]).
In this case:
number of moles of solute (sodium hydroxide)= 0.2 molesvolume= 0.5 LReplacing:
[tex]Molarity (M)=\frac{0.2 moles}{0.5 L}[/tex]
Molarity= 0.4 [tex]\frac{moles}{liter}[/tex]
The molarity is 0.4 [tex]\frac{moles}{liter}[/tex]
Molar mass of Fe2O3 = g/mol
Answer:
159.6882 grams
Explanation:
7 points
How many Hydrogen atoms are found on the REACTANT side of the
chemical equation below?
P4010+H2O----->H3PO4
O 3
O 2
O 10
O 4
Answer: 12 ( answer not among the option)
Explanation:
From the equation of reaction; P4O10+ H2O -----> H3PO4, it is unbalanced.
One can only get the exact number of ''Hydrogen atom'' if it is well balanced.
Adding '4' to H3PO4 on the RHS and '6' to H2O on LHS of the equation would give a balanced equation such as;
P4O10 + 6H2O -----> 4 H3PO4
Therefore the number of hydrogen atoms found on the reactant is 12.
In a solid to liquid mixture and increase in temperature means?
Answer:
Increase in temperature will not affect a solid - liquid mixture. Example can be taken of salt and water
my Chemistry questions
How can you burn an apple, blueberry, rose and pumpkin without leaving any ashes but retaining the smell of it?
Answer:
candles
Explanation:
if u burn these fruits, it is obvious that there will be ashes but the key hint here is
" retaining the smell"
and what are things that smell and can be fruit scented?
a..... CANDLE
hope this helped :D
Answer:
BY BURNING A CANDLE WITH ITS SCENT
Explanation:
the kind of friction that shows a falling object is it gravity, free fall
Answer:
It's called air resistance.
Explanation:
While it may seem hard to believe at first, all objects in free fall accelerate at the same rate regardless of their masses. Objects falling through air experience a type of fluid friction called air resistance.
Using the stars as an example explain how nuclear fusion works
A scuba tank contains a mixture of oxygen (O2) and nitrogen (N2) gas. The oxygen has a partial pressure of PO2=5.62MPa. The total gas pressure is 26.78 MPa. What is the partial pressure of nitrogen gas in the tank?
Answer:
21.16 MPa
Explanation:
Partial pressure of oxygen = 5.62 MPa
Total gas pressure = 26.78 MPa
But
Total pressure of the gas= sum of partial pressures of all the constituent gases in the system.
This implies that;
Total pressure of the system = partial pressure of nitrogen + partial pressure of oxygen
Hence partial pressure of nitrogen=
Total pressure of the system - partial pressure of oxygen
Therefore;
Partial pressure of nitrogen= 26.78 - 5.62
Partial pressure of nitrogen = 21.16 MPa
Answer:
The partial pressure of Nitrogen gas in the tank = 21.16 MPa.
Explanation:
According to Dalton's Law of partial pressure for gases, the total pressure of a mixture of gas under unchanging conditions is a sum of the partial pressures of each of the individual constituent gas.
The mixture consists of Nitrogen and oxygen gas. Hence, mathematically,
Total Pressure of the mixture = (Partial Pressure of Oxygen gas) + (Partial Pressure of Nitrogen gas)
Total Pressure of the mixture = 26.78 MPa.
Partial Pressure of Oxygen gas = 5.62 MPa.
Partial Pressure of Nitrogen gas = ?
26.78 = 5.62 + (Partial Pressure of Nitrogen gas)
Partial Pressure of Nitrogen gas = 26.78 - 5.62 = 21.16 MPa.
Hope this Helps!!!
Some processes for making coffee leave tiny particles of ground coffee beans suspended in the coffee when it is served. Can these particles be considered a solute if they are evenly distributed throughout the cup of coffee? Explain.
Answer:
b
Explanation:
Mixtures are made up of what substances.
Answer:
Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule. A mixture is composed of different types of atoms or molecules that are not chemically bonded.
Answer:
It would depend on the mixture to determine what the mixture is.
Explanation:
If you don't know what the mixture is then you wont be able to find what substances, since their could be many components.
This Venn diagram is used to compare the products and reactants of a reaction of baking soda and vinegar. What could be put into the intersection? Precipitates Chemical compounds Solid compounds Gases
I think and I'm sure it is gases
Answer:
gasses
Explanation:
i took the quiz
You complete a titration and find that you need 2.5 mL of a 0.1M NaOH to neutralize 250 mL of
the river water.
How many moles of NaOH did you use to neutralize the river water?
Answer:
0.00025 mole
Explanation:
The number of moles of a substance can be mathematically derived from the following formula
1. mass of substance (in grams)/molar mass of substance (in grams/mole)
2. molarity of substance (in mol/dm3) x volume of substance (in dm3)
In this case, the molarity and volume of NaOH are provided, hence, the second formula will be applicable.
2.5 mL of NaOH was used = 0.0025 dm3
Number of mole of NaOH that was used to neutralize the river water:
= 0.1 x 0.0025 = 0.00025 mole
The number of mole of NaOH used to neutralize the river water is 0.00025 mole.
What is the molarity of a solution formed by dissolving 100 g of Ca(No3)2 and 450 mL of solution
Answer:
1.35 M
Explanation:
grams/molar mass=ans./volume(L)
100/164=ans./.450
define galvanization
Answer:
Galvanization or galvanizing is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which the parts are submerged in a bath of molten hot zinc.
What is the molarity of 10g of carbon in a 500L solution?
Answer:
Molarity is the number of moles in a liter of a substance.
Molarity= Mole/volume
Mass= 10g
Molar mass of Carbon=12g
To calculate the mole we use the formula: mole= mass/molar mass
Mole = 10g/12g
Mole = 0.83
Molarity= 0.83/500 =0.0017moles per liter
Consider the chemical equations shown here.
P4(s)+3O2(g)--->P4O6(s) ΔH1 = -1,640.1 kJ
P4O10(s) → P4(s) + 5O2(g) ΔH2 = 2,940.1 kJ
What is the overall enthalpy of reaction for the equation shown below?
Round the answer to the nearest whole number.
P4O6(s) + 2O2(g) --->P4O10(s)
Answer:
-1300. kJ
Explanation:
We have two equations:
1. P₄(s) +3O₂(g) ⟶ P₄O₆(s); ΔH₁ = -1640.1 kJ
2. P₄O₁₀(s) ⟶ P₄(s) + 5O₂(g); ΔH₂ = 2940.1 kJ
From these, we must devise the target equation:
3. P₄O₆(s) + 2O₂(g) ⟶ P₄O₁₀(s); ΔH = ?
The target equation has P₄O₆(s) on the left, so you reverse Equation 1.
When you reverse an equation, you reverse the sign of its ΔH.
4. P₄O₆(s) ⟶ P₄(s) +3O₂(g); ΔH₁ = 1640.1 kJ
Equation 4 has P₄ on the right. That is not in the target equation.
You need an equation with P₄ on the left, so you reverse Equation 2.
5. P₄(s) + 5O₂(g) ⟶ P₄O₁₀(s); ΔH₂ = -2940.1 kJ
Now, you add equations 4 and 5, cancelling species that appear on opposite sides of the reaction arrows.
When you add equations, you add their ΔH values.
You get the target equation 3:
4. P₄O₆(s) ⟶ P₄(s) + 3O₂(g); ΔH₁ = 1640.1 kJ
5. P₄(s) + 2(5)O₂(g) ⟶ P₄O₁₀(s); ΔH₂ = -2940.1 kJ
3. P₄O₆(s) + 2O₂(g) ⟶ P₄O₁₀(s); ΔH = -1300. kJ
ΔH for the reaction is -1300. kJ
If you want to make more shells (CaCO3) then which direction should the reaction proceed?
Answer:
The reaction will proceed in the reverse direction
Explanation:
Now consider the equation;
CaCO3(s) ⇄CO2(g) + CaO(s)
This is a reversible reaction. The reaction could proceed in either the forward or the reverse reaction depending on the conditions of the reaction. Under certain conditions, the forward reaction is favoured, under certain conditions, the reverse reaction is favoured.
The direction in which the reaction proceeds depends on the desired products as the equilibrium position could be manipulated at will by altering the reaction conditions. If the desire is to produce more CaCO3, then the equilibrium position is manipulated so that it shifts towards the left hand side. This implies that the reverse reaction is favoured.
PLEASE HELP WILL GIVE BRAINLIEST ANSWER!
58.5 grams of NaCl is dissolved in 0.5 liters of water. The molarity of the solution is _____.
b. 2 M
c. 29.25 M
d. 117 M
58.5 grams of NaCl is dissolved in 0.5 liters of water, then the molarity of the solution is 2M.
What is molarity?Molarity of any solution is define as the number of moles of solute present in per liter of solution and it is represented as:
M = n/V, where
V = volume of solution = 0.5 L
n is moles and will be calculated as:
n = W/M, where
W = given mass of NaCl = 58.5g
M = molar mass of NaCl = 58.44 g/mol
n = 58.5/58.44 = 1 mole
Molarity will be represented as:
M = 1/0.5 = 2 M
Hence required molarity of NaCl is 2M.
To know more about molarity, visit the below link:
https://brainly.com/question/26528084
how many molecules are there in 125 grams of sugar, C12H22O11
Answer:
125
Explanation:
A molecule of sucrose (C12H22O11) has 12 carbon atoms, 22 hydrogen
A sample of gas at 313 K and 4.95 atm occupies 85.62 L of space. Which
variable is the volume (V)? (Note: You are not solving the problem, just
choose the correct variable.)
Answer: 85.62 L represents volume (V).
Explanation:
Volume is defined as the amount or quantity of a given substance or an object.
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = 4.95 atm
V = Volume of gas = 85.62 L
n = number of moles
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]313K[/tex]
Thus 85.62 L represents volume (V).
In calculating the mean donation amount, which steps would you need to take? Check all that apply.
A)Multiply each donation amount by the number of people. B)Add the total amount of money. C)Add the total number of people D)2,550 ÷ 25 = $102 E)25 ÷ 2,550 = $0.01
Answer:
A,B,C,D
Explanation:
I just took the test
Answer:
Its
A: Multiply each donation amount by the number of people.
B: Add the total amount of money.
C: Add the total number of people.
D: 2,550 ÷ 25 = $102
Explanation:
Edg2020
A 1.8−mL volume of seawater contains about 4.0 × 10^−10 g of gold. The total volume of ocean water is about 1.5 × 10^21 L. Calculate the total worth of all the gold in the world's oceans if the price of gold is $19.96 per gram answer is in scientific notation
Answer: $6.653×10^15
Explanation:
Volume of sea water sample = 1.8mL
Mass of gold in sample = 4.0 × 10^-10 g
Total volume of ocean water = 1.5 × 10^21 L
Converting volume of seawater sample into liters :
1.8mL = (1.8/1000)L = 0.0018L = 1.8×10^-3
If volume of gold in ;
1.8×10^-3L = 4 × 10^-10 g
1.5×10^21 L = X
(1.8×10^-3L)X = [(1.5×10^21) × (4×10^-10) ]
X = [1.5×4(10^21-10)] / 1.8×10^-3
X = 6.0(10^11) / 1.8×10^-3
X = 3.333×(10^11+3)
X = 3.333 × 10^14
Cost of world's gold equals
(3.333 × 10^14) × $19.96
$66.53 × 10^14
200 L of a gas at 10 atm pressure and 400 K is cooled to 100 K and reduced to 2 atm pressure. What is the new volume?
Answer:
250L
Explanation:
Data;
V1 = 200L
P1 = 10atm
T1 = 400K
T2 = 100K
P2 = 2atm
V2 = ?
To solve this question, we'll have to use the combined gas equation which is a combination of Boyle's law, Charles law and pressure law.
From combined gas equation,
(P1 × V1) / T1 = (P2 × V2) / T2
P1 × V1 × T2 = P2 × V2 × T1
Solve for V2,
V2 = (P1 × V1 × T2) / P2 × T1
V2 = (10 × 200 × 100) / (2 × 400)
V2 = 200,000 / 800
V2 = 250L
The final volume of the gas is 250L
Organic chemistry!!! Plz help
Answer:
3) 2,2-dichloroheptane
Explanation:
2,2-dichloroheptane
the force that one surface exerts on another when the two rub against each other is called _
Answer:
friction
Explanation:
Asap help
It's very important
Answer:
b. blinking of eyes
Explanation:
Answer:
The answer is B
Explanation:
Blinking is involuntary but also can be done voluntarily.