Answer:
a
Explanation:
How many oxide ions are in 0.55 grams of titanium oxide?
Answer: There are [tex]0.052\times 10^{23}[/tex] oxide ions
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{0.55gg}{64g/mol}=0.0086moles[/tex]
1 mole of TiO contains = [tex]6.023\times 10^{23}[/tex] oxide ions
Thus 0.0086 moles of TiO contains = [tex]\frac{6.023\times 10^{23}}{1}\times 0.0086=0.052\times 10^{23}[/tex] oxide ions
There are [tex]0.052\times 10^{23}[/tex] oxide ions
Explain why your hair sticks to a plastic (polyethylene) comb.
Answer:
Due to the accumulation of static charges/due to static electricity
Which statement about the extraction of metals is correct? *
A. Aluminium is extracted from bauxite by electrolysis.
B. Aluminium is extracted from hematite by heating with carbon.
C. Iron is extracted from bauxite by heating with carbon.
D. Iron is extracted from hematite by electrolysis.
Answer:
Explanation:
In this reaction, the iron(III) oxide is reduced. to iron, and the carbon is oxidised. to carbon dioxide. In the blast furnace, it is so hot that carbon monoxide can be ...
The statement about the extraction of metals that is correct is Aluminium is extracted from bauxite by electrolysis.
What is extraction of metals?Extraction of metals refers to various methods use to extract metals from the ground and refining it to a form that will easily be use by man.
Therefore, The statement about the extraction of metals that is correct is Aluminium is extracted from bauxite by electrolysis.
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A 60.0 kg object is moving east at 8.00 m/s, and then slows down to 4.00 m/s. How much work was done?
–1,440 J
–480 J
1,440 J
2,880 J
Answer:
A
-1440J
Explanation:
Hello,
This question requires us to calculate the work done on a object to move it from point A to point B
Data
Mass = 60kg
Initial velocity (V1) = 8.0m/s
Final velocity (V2) = 4.0m/s
Workdone on an object is equal to force applied on the object to move it through a particular distance.
Work done = force × distance
Force (F) = mass × acceleration
Distance = s
F = Ma
Work done = M× a × s
But a = velocity (v) / time (t)
Work done = mvs / t
But velocity = distance/ time
Work done = mv × v/
Work done = mv²
Work done = ½mv²
Workdone = ½M(V2² - V1²)
Workdone = ½ × 60 (4² - 8²)
Work done = 30 × (16 - 64)
Workdone = 30 × (-48)
Work done = -1440J
Work done = -1.44kJ
The workdone on the object is equal to -1.44kJ
Answer:
–1,440 J
Explanation:
a on edge 2021
How many grams of krypton gas would occupy 1.34L at STP?
Answer:
5.01 g
Explanation:
At STP means at standard temperature and pressure, this is when the pressure is at 1 atm and temperature is at 273 K. At this point, the volume is 22.4 L for 1 mole of any ideal gas at a temperature equal to 273.15 K and a pressure equal to 1.00 atm
The molar mass of krypton as gotten from the periodic table is 83.8 g/mol. At STP, an ideal gas occupies 22.4 L/mol. Therefore, the grams that 1.3 L of krypton gas would occupy is:
[tex]mass=\frac{1mol}{22.4L} *\frac{83.8g}{1mol} *1.34L=5.01g[/tex]
In a solution of brine (salt water), what is the salt? A. a solute B. a solvent C. a solution D. a reactant E. a product
Answer:
solute
Explanation:
solvent is the water solution is the whole mixture product is the solution
A. a solute
B. a solvent
C. a solution
D. a reactant
E. a product
24-Complete the following sentence:
Osmosis is a process during the _____ moves to balance the concentrations on both sides of a membrane.
the choices:
a: solute
b: solvent
c: substrate
d: soda cracker
Answer:
B. Solvent
Explanation:
In osmosis, water always moves from low solute concentration to high solute concentration. SOLUTE NEVER MOVES AS IT CANNOT PASS THE SELECTIVELY PERMEABLE MEMBRANE. alot of caps but need to stress this concept cuz otherwise this concept gets very confusing
what causes the volume to change in gases? (choose all that apply)
a) temperature
b) density
c) shape of container
d) pressure
Answer:
Temperature, pressure, shape of container
Answer:
temperature, density, pressure.
Explanation:
Que tienen en comun el chocolate, las papas fritas y la hamburguesa?
Que tienen en comun los vegetales, el huevo y el pan?
Answer: todos terminan en tu boca
Explanation:
Hahaha
Using an example of an Acid or a Base give the Arrhenius definition for acids and bases.
What is the difference between metals, nonmetals and metalloids?
Metals are solids, non metals are gasses and metalloids are in between metals and non metals. Also, metals have there atoms all close and packed, non metals have there atoms far apart, and metalloids have there atoms either close or far apart. Metals are separated form the non metals in the periodic table.
i don’t know the answers to these pls help
Answer:
4. Option C. Pentane.
5. Option D.
Explanation:
4. Hydrocarbons are compound containing carbon and hydrogen only. Hydrocarbons are said to be saturated when they contain only carbon to carbon single bond. All alkanes are saturated hydrocarbon.
The correct answer is pentane.
5. Isomerism is the phenomenon whereby two or more compounds have the same molecular formula but different structural patterns. The compounds involved are called isomers.
A careful observation of the diagram above shows that only option D satisfied the definition of Isomerism as the two compound both have the same molecular formula as C3H8O but different structural patterns.
Note: option C does not contain isomers as Isomerism can not occur in a compound having just 1 carbon atom.
What is the valency of oxygen??????
Answer:
the valency of oxygen is -2
Answer:
-2
Explanation:
The valency of oxygen is -2. This means oxygen needs to gain or share two electrons for stability.
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Which set of characteristics would you use to classify this planet as an inner or terrestrial planet?
Answer:
Dense and solid. And located near a star.
Explanation:
The set of characteristics that you would use to classify this planet as an inner or terrestrial planet is Dense and solid.
What are the characteristics used to classify terrestrial planets?Terrestrial planets are Earth-like planets made of rocks or metals with a hard floor. Terrestrial planets even have a molten heavy-steel middle, few moons, and topological capabilities which include valleys, volcanoes, and craters.
Which set of traits describe the internal planets?
All are solid, dense, and rocky. not one of the internal planets has rings. compared to the outer planets, the internal planets are small. they have shorter orbits across the sun and they spin more slowly.
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Bleach is a 0.750 M solution of sodium hypochlorite. What volume, in litres, would contain 120.3 g of sodium hypochlorite?
Answer:
2.15 L
Explanation:
M(NaOCl) = 23.0 + 16.0 + 35.5 = 74.5 g/mol
120.3 g *1 mol/74.5 g = 1.615 mol NaOCl
0.750 M = 0.750 mol/L
1.615 mol * 1L/0.750 mol = 2.15 L
P O R F A V O R
4. Expresa las siguientes magnitudes en unidades del Sistema
Internacional. (1 punto)
a. 45 m3
b. 1250 cm3
c. 63 días
d. 97 cm/min2
e. 927 g∙cm/min2
f. 97 km/h2
g. 2500 g/cm2
h. 36 km/h
Answer:
a. 45×10³ kg
b. 1.25 kg
c. 5443200 s
d. 2.69×10⁻⁴ m/s²
e. 2.57×10⁻⁶N
f. 7.48×10⁻³ m /s²
g. 2.45 Pa
h. 10 m/s
Explanation:
The SI units are: kg, m, s, N, K, A, Pa, J and cd
a. 1 g is the mass for 1 cm³. We convert the m³ to cm³
45 m³. 1×10⁶ cm³ / 1 m³ = 45×10⁶ cm³
By the way, 45×10⁶ cm³ = 45×10⁶ g
We convert the g to kg → 45×10⁶ g . 1 kg / 1000 g = 45×10³ kg
b. As 1 g = 1 cm³, we convert the cm³ to g and then, the g to kg
1250 cm³ = 1250 g → 1250 g . 1kg / 1000 g = 1.25 kg
c. 1 day has 24 hours; 1 hour has 60 minutes; 1 minute has 60 seconds
1 hour has 3600 s. Then 24 h . 3600 s / 1 h = 86400 s
86400 s/d. 63 d = 5443200 s
d. 1 min² = 3600 s²
97 cm / 3600 s² = 0.0269 cm/s² / 100 = 2.69×10⁻⁴ m/s²
e. 927 g.cm / min² / 3600 s² = 0.2575 g.cm/s² → dyn
We need to convert dyn to N
1 dyn = 10⁻⁵N → 0.2575 dyn . 10⁻⁵N / 1dyn = 2.57×10⁻⁶N
f. 1 m/s² = 12960 km/h²
12960 km/h² . 1 m/s² / 97 km/h² = 7.48×10⁻³ m /s²
g. 2500 g/cm² . 1kg / 1000 g = 2.5 kg/cm²
1 Pa = 1.02kg/cm²
2.5 kg/cm² . 1 Pa / 1.02 kg/cm² = 2.45 Pa
h. 1 h = 3600 s
36 km / 3600 s = 0.01 km /s → 0.01 km . 1000 m / 1 km = 10
= 10 m/s
Which of these compounds is the odd
one out? *
(1 Point)
H2O
NaBr
NH₃
HCI
Write the balanced equation for the reaction between HCl and NaOH. Then, calculate the molarity of the NaOH.
Answer:
HCl (aq) + NaOH (aq) --> H2O (L) + NaCl (aq)
Explanation:
HCl is a strong acid while NaOH is a strong alkali. Hence both should dissociate completely in water and 1 mol of HCl will fully neutralise 1 mol of NaOH.
I'm assuming that Part 2 on molarity is part of a data based question that requires you to calculate the number of moles of NaOH based on the data provided and the equation that you are required to balance. Hence, I can't help you with it as I do not have the values.
Calculate the amount of energy required to boil 25.00 g of mercury.
Answer:
C. 7.4 kJ
Explanation:
Let assume that Mercury is at room temperature (25 °C). The energy required to boil the sample of mercury is the sum of sensible and latent heats. Mercury has a fussion and boiling points of -38.83 °C and 356.7 °C, respectively, and a specific heat of [tex]138\,\frac{J}{kg\cdot ^{\circ}C}[/tex]. Then:
[tex]Q = (25\,g)\cdot \left[\left(0.138\,\frac{J}{g\cdot ^{\circ}C} \right)\cdot (356.7^{\circ}C - 25^{\circ}C) + 296\,\frac{J}{g} \right][/tex]
[tex]Q = 8544.365\,J[/tex]
The option that offers the best approximation to the result is C.
The specific heat of ethanol is 2.44 J/g ֯C. How many kJ of energy are required to heat 50.0 grams of ethanol from -20 ֯C to 68 ֯C? (heat equation)
Answer:
Heat energy required (Q) = 10.736 KJ
Explanation:
Given:
Specific heat of ethanol (C) = 2.44 J/g °C
Mass of ethanol (M) = 50 gram
Initial temperature (T1) = -20°C
Final temperature (T1) = 68°C
Find:
Heat energy required (Q) = ?
Computation:
Change in temperature (ΔT) = 68°C - (-20°C)
Change in temperature (ΔT) = 88°C
Heat energy required (Q) = mC(ΔT)
Heat energy required (Q) = (50)(2.44)(88)
Heat energy required (Q) = 10,736 J
Heat energy required (Q) = 10.736 KJ
