Answer:
0.o75 mol Ti = 4.5x10∧22
2.10 mol CO2 = 1.26x10∧24 molecules
hope this helped
A 20.0 mL of 0.27 M solution of the salt NaA has a pH of 8.70.
a) Calculate the pk, value of the acid HA.
(Correct to 3 sig. fig)
b) Calculate the pH of a solution containing 0.3 M HA and 0.1 M NaA.
(Correct to 3 sig. fig)
Answer:
a) 3.969
b) 3.489
Explanation:
a) Calculate the pk, value of the acid HA
PH of salt hydrolysis
P[tex]^{H}[/tex] = 1/2 ( pkw + pka + logC )
8.7 * 2 = 14 + log ( 0.27 ) + Pka
∴ Pka = 3.9686 ≈ 3.969
b) Calculate the PH of a solution containing 0.3 M HA and 0.1 M NaA
PH = Pka + log ( salt / acid )
= 3.9686 + log ( 0.1 / 0.3 )
= 3.9686 - 0.48 = 3.489
Looking at page 14 of the earth science tables, how does the temperature change as a balloon rises through the Troposphere Stratosphere and Mesosphere?
Increase, decreases, increases again
Decreases, increases, decreases again
Increases
Decreases
Answer:
Decreases
Explanation:
The temperature decreases when latitude increases.
helllllppppppp pleaseeeeeee
help, please ( rando words )
Answer:
ionic
Explanation:
Answer:
the answer is ionic
Explanation:
hope this helps!
please can i also have brainliest too?
3 points
5. Which of the following is true regarding the atoms involved in a
chemical reaction? *
a) During a chemical reaction, atoms will always be combined into much larger
molecules.
b) Some of the atoms will always be changed into a different type of atom by a
chemical reaction.
c) Some of the atoms present before the reaction will always be lost during a
chemical reaction.
d) The same number of each type of atom will always be present before and after a
chemical reaction takes place.
How can an unbalanced force affect an object?
O Unbalanced forces keep an object at rest.
Unbalanced forces cause objects to accelerate.
O Unbalanced forces cannot affect on object.
PLEASE HELP ME!!!
A 38.8g piece of metal alloy absorbs 181J as its temperature increases from 25.0°C to 36.0°C°. What is the alloy's specific heat? Show your work.
0.424 J/g °C
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightEquality Properties
Multiplication Property of Equality Division Property of Equality Addition Property of Equality Subtraction Property of EqualityChemistry
Thermochemistry
Specific Heat Formula: q = mcΔT
q is heat (in Joules)m is mass (in grams)c is specific heat (in J/g °C)ΔT is change in temperatureExplanation:Step 1: Define
[Given] m = 38.8 g
[Given] q = 181 J
[Given] ΔT = 36.0 °C - 25.0 °C = 11.0 °C
[Solve] c
Step 2: Solve for Specific Heat
Substitute in variables [Specific Heat Formula]: 181 J = (38.8 g)c(11.0 °C)Multiply: 181 J = (426.8 g °C)c[Division Property of Equality] Isolate c: 0.424086 J/g °C = cRewrite: c = 0.424086 J/g °CStep 3: Check
Follow sig fig rules and round. We are given 3 sig figs.
0.424086 J/g °C ≈ 0.424 J/g °C
What is energy measured in
Answer:
The unit of energy you measure in is joule.
What is needed for our cells to get energy from our food?
Answer:
cellular respiration is needed for our cells to get energy from our food.
Explanation:
Through the process of cellular respiration, the energy in food is converted into energy that can be used by the body's cells. During cellular respiration, glucose and oxygen are converted into carbon dioxide and water, and the energy is transferred to ATP.
is Tungsten carbide an elementary substance
or compound?
Answer:
Tungsten carbide (chemical formula: WC) is a chemical compound (specifically, a carbide) containing equal parts of tungsten and carbon atoms.
Answer:compound
Explanation:
is the distilled water/acidic/basic/netural?
Distilled Water Has A Neutral pH, Which Means It Is Neither Acidic Nor Basic. Therefore, It's Neutral.
A sample of hydrogen changes its pressure from 756 torr to 499 torr while the temperature remains constant. After the pressure is reduced, the volume of the gas is 789 mL. What was the original volume?
P1 = 756 torr
P2 = 499 torr
V2 = 789 mL
V1 = ?
applying Boyle's Law
P1 * V1 = P2 * V2
756 torr * V1 = 499 torr * 789 mL
V1 = 499 torr * 789 mL / 756 torr
V1 = 520.78 mL
Except for the noble gases, most non-metals become anions.
True
False
Biomes are characterized by temperature, precipitation, and the plant and animal communities that live there.
True or false?
Help plz 10 pointsss———-
Answer:
the first question is homeostasis. and the second question is the wolf panting
Explanation:
let me know if u need an explanation n ill try to give one :)
Help please if link will report
One step in the production of copper is to heat copper (I) sulfide, Cu2S, with oxygen. This
produces copper (I) oxide and sulfur dioxide gas according to the following reaction:
2Cu2S(s)
+ 3O2(g)
→ 2Cu2O(s)
+ 2SO2(g)
What is the greatest mass of SO2 that can be produced from 15.0 mol Cu2S?
Answer:
9.61 x 10^2 g SO2
Explanation:
Ur welcome
label the parts of the wave
The phenomenon that allows water to travel against gravity through thin openings (for
example, to the top of trees) is called:
Answer:
El motor que las permite vencer la gravedad es la evaporación del agua que tiene lugar en las hojas.
Explanation:
Two tons of water is pumped into a tank 15 ft. High in 5 minutes. Determine the power output of the pump. (Note: One ton is equal to 2,000 lb. And remember to convert the minutes to seconds.)
Answer:
200 lb•ft/s
Explanation:
From the question given above, the following data were obtained:
Force (F) = 2 tons
Time (t) = 5 mins
Height (h) = 15 ft
Power (P) =?
Next, we shall convert 2 tons to pound. This can be obtained as follow:
1 ton = 2000 lb
Therefore,
2 tons = 2 × 2000
2 tons = 4000 lb
Next, we shall convert 5 mins to seconds. This can be obtained as follow:
1 min = 60 s
Therefore,
5 mins = 5 × 60
5 mins = 300 s
Finally, we shall determine the power of the pump. This can be obtained as follow:
Force (F) = 4000 lb
Time (t) = 300 s
Height (h) = 15 ft
Power (P) =?
P = F × h / t
P = 4000 × 15 / 300
P = 60000 / 300
P = 200 lb•ft/s
Thus, the power of the pump is 200 lb•ft/s
Answer:
It's 200 ft-lb/sec
Explanation:
I did it before!
which situation best represents convection
Answer:
A hot air balloon taking off
Explanation:
The United States has landed a device on Mars.
Answer:
They landed a Rover!
Explanation:
Isn't that Awesome!?!
Question 7 (1 point
What is the general pattern seen in the periodic table that helps a person quickly identify if an element is a nonmetal? (Where are nonmetals
generally found on the periodic table?)
Answer:
the elements to the right including hydrogen
Explanation:
as you know non-metal tend to gain eletrons
basically group 5, 6, and 7 are nonmetals
group 1, 2, and 3 are metals and group 4 are transitional metals so be careful with group 4
. Chalk is made of CaCO 3 . How many molecules are in 5 grams of chalk?
Answer:
20.02 grams of chalk.
Explanation:
name two examples which are not considered as matter
Answer:
Light and Sound can be considered as non-matter.
Explanation:
Various forms of Energy like Heat, Sound, Light can be considered as non-matter
Is specific heat capacity always equal to heat capacity?
Answer:
No specific heat capacity and heat capacity are not equal
which contain more heat a cup of coffee or a glass of iced tea? thank you
Answer:
Relationship between heat and temperature
The water molecules in a cup of hot coffee have a higher average kinetic energy than the water molecules in a cup of iced tea, which also means they are moving at a higher velocity.
Which property of sulphuric acid makes it suitable to use as a catalyst for the preparation of esters?
3. The mass percent of nitrogen in NH4Cl is *
O 16.7% nitrogen
0 25.0% nitrogen
0 26.2% nitrogen
O none of these
Answer:
None of these
Explanation:
The mass percent is 35.4% (3 s.f.)
14/4+35.5 = 14/39.5 x 100 = 35.4 (3 s.f.)
Bronsted Lowry reactions can use hydroxide ions.
True
False
Answer:
f
Explanation: