Answer: which*
Explanation:
describe some acidic oxides that can be prepared by the thermal decomposition of nitrates and carbonates
the heat of fusion of aluminum is 95 cal/g. calculate how many grams of aluminum(already at its melting point) could be melted with 1,265,730 cal of energy (round your answer to two decimal places)
Given
Lf=latent heat of fusion of Al = 95 cal/g
Q = 1,265,730 cal
Required
mass of Aluminium
Solution
The heat to change the phase can be formulated :
Q = m.Lf (melting/freezing)
Input the value
1,265,730 cal = m . 95 cal/g
m = 1,265,730 cal : 95 cal/g
m = 13323.47 g
Can you help me with this 19 points
Answer:
21
Explanation:
To find the total atoms.
Multiply 3 *2 and you will get 6
Then multiply 3 * 5 and you will get 15.
You do this because there is 3 as a coefficient and is before the chemical compound. Furthermore, that means the same thing as a parenthesis.
Last of all, add 15 + 6 and you will get 21.
Therefore, there are a total of 21 atoms.
72.40% iron,27.60% Oxygen Empirical formula
Explanation:
Fe. O
72.40/ 56 27.60/16
____________________
1.29/1.29 1.725/1.29
_____________________
1. :. 1
Emperical formula = FeO
Empirical formula is the whole number ratios of elements in a compound. It can be found from the number of moles. The empirical formula of iron and oxygen of 72.4 % and 27.6 % respectively is Fe₂O₃.
What is empirical formula?Empirical formula of a compound is the chemical formula derived from the number of moles each element present in it. Whereas, molecular formula is derived from the actual masses of the elements present in the compound.
Empirical formula can be determined from the number of moles of the elements. It is given that the mass percentages of iron and oxygen are 72.40% and 27.60% respectively. This can be taken as 72.40 g and 27.60 g in a 100 g of compound.
Thus there is 72.40 g of iron. The atomic mass of Fe = 55.85 g/mol
Thus number of moles of Fe = 72.40 / 55.85
= 1.295
The weight of oxygen in 100 g of compound is 27.60 g. Atomic mass of oxygen is 16 g/mol.
Thus number of moles of oxygen = 27.60 /16 = 1.725
Taking the ratios of these number of moles = 1.295 :1.725 = 2 :3
Hence, the ratios of iron to oxygen is 2:3 which means the empirical formula of the compound is Fe₂O₃.
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A bottle of a commercial reagent-grade hydrochloric acid, HCI, has the following
information on its label: Assay 37% HCl by mass; density 1.19 g/mL. Calculate the
volume (ml) of concentrated Hd needed to prepare 250 mL of 0.1M HCI.
The volume of concentrated HCl : 2.073 ml
Further explanationGiven
37% HCl by mass; density 1.19 g/mL
Required
The volume of concentrated HCl
Solution
Conversion to molarity :
37% x 1.19 g/ml =0.4403 g/ml
g/ml to mol/L :
=0.4403 g/ml x 1000 ml/L : 36.5 g/mol
=12.06 mol/L
or we can use formula :
[tex]\tt M=\dfrac{\%\times \rho\times 10}{MM}\\\\M=\dfrac{37\times 1.19\times 10}{36.5}\\\\M=12.06[/tex]
Dilution formula :
M₁V₁=M₂V₂
12.06 M x V₁ = 0.1 M x 0.25 L
V₁ = 0.0021 L = 2.073 ml
A species is a specific kind of living thing.
True
False
Answer:
I think the answer is true
Biological half-life of medicine works in the same way as radiological half-life. Acetaminophen (Tylenol) has a biological half-life of about 2 hours (though it varies depending on individual metabolism). What percentage of your original dosage remains in your system after 6 hours when you are allowed to take another dose?
Answer:
12.5%
Explanation:
From the question given above, the following data were obtained:
Half-life (t½) = 2 h
Time (t) = 6 h
Percentage remaining =.?
Next we shall determine the number of half-lives that has elapse. This can be obtained as follow:
Half-life (t½) = 2 h
Time (t) = 6 h
Number of half-lives (n) =?
n = t / t½
n = 6/2
n = 3
Finally, we shall determine the percentage of original dosage remaining as follow:
Amount remaining (N) = Original amount (N₀) /2ⁿ
N = N₀ / 2ⁿ
Divide both side by N₀
N/N₀ = 1/2ⁿ
Input the value of n i.e 3
N/N₀ = 1/2³
N/N₀ = 1/8
N/N₀ = 0.125
Multiply by 100 to express in percent.
N/N₀ = 0.125 × 100
N/N₀ = 12.5%
Thus, percentage of original dosage remaining is 12.5%
i need help with this
Answer:
It would be the last one because the way earth is tilted the sun rays would be pointing at the Northern Hemisphere more than the Southern Hemisphere
Calculate the number of gams of nitrogen dioxide that are produced from 4 moles of nitric oxide
2NO(g) + O2(g) → 2NO2(g)
PLZ ANSWERRR FAST
Answer: 184 g of nitrogen dioxide that are produced from 4 moles of nitric oxide
Explanation:
The balanced chemical reaction is:
[tex]2NO(g)+O_2(g)\rightarrow 2NO_2(g)[/tex]
According to stoichiometry :
2 moles of [tex]NO[/tex] produce = 2 moles of [tex]NO_2[/tex]
Thus 4 moles of [tex]NO[/tex] will require=[tex]\frac{2}{2}\times 4=4moles[/tex] of [tex]NO_2[/tex]
Mass of [tex]NO_2=moles\times {\text {Molar mass}}=4moles\times 46g/mol=184g[/tex]
Thus 184 g of nitrogen dioxide that are produced from 4 moles of nitric oxide
The lattice energy for ionic crystals increases as the charge on the ions _____________ and the size of the ions __________________. Group of answer choices decreases, increases decreases, decreases increases, increases increases, decreases
Answer:
increases
and the 2nd one increases
if a bike travels 23m at constant speed 5289s what is the bikes speed?
Answer:
0.004 m/s
Explanation:
Given data:
Distance traveled = 23 m
Time taken = 5289 s
Speed of bike = ?
Solution:
Formula:
speed = distance / time
b y putting values,
speed = 23 m/ 5289 s
speed = 0.004 m/s
A force that does not have a high amount of effect
Answer:
yes
Explanation:
its not that hard to get
The mass of one gallon of water is approximately 3.78 kg or 3780 grams. How many moles are contained in one gallon of water?
a. 102
b. 210
c. 120
d. 201
Answer:
Number of moles of water = 210 mol
Explanation:
Given data:
Mass of water = 3780 g
Number of moles of water = ?
Solution:
Formula:
Number of moles = mass/molar mass
Molar mass of water = 18 g/mol
Number of moles = 3780 g/ 18 g/mol
Number of moles of water = 210 mol
WILL GIVE BRAINEST + 500 PTS ...
1.Scientists have evidence that the universe is [expanding/shrinking].
2.Objects moving away from Earth appear [blue/red], and objects moving toward Earth appear [blue/red].
3. Light from most other galaxies appears [blue/red], which makes sense if the universe is [collapsing inward/spreading out].
Answer:
1. expanding
2. red, blue
3. red, spreading out
Explanation:
Which element has the greatest electronegativity?
a. Rubidium
b. Silver
c. Tin
d. Iodine
What is produced when an acid and an alkali react?
A. Water and a base
B. Water and Carbon dioxide
C. Salt and a base
D. Salt and water
socratic For the following reaction, 25.6 grams of hydrochloric acid are allowed to react with 52.4 grams of barium hydroxide . hydrochloric acid(aq) barium hydroxide(aq) barium chloride(aq) water(l) What is the maximum amount of barium chloride that can be formed
Answer:
63.7g BaCl₂
Explanation:
Based on the chemical reaction:
2HCl + Ba(OH)₂ → BaCl₂ + 2H₂O
2 moles of HCl reacts per mole of barium hydroxide
To solve this question, we need to convert the moles of each reactant to moles and, using the chemical reaction, find limiting reactant as follows:
Moles Ba(OH)₂ - Molar mass: 171.34g/mol-
52.4g Ba(OH)₂ * (1mol / 171.34g) = 0.306 moles Ba(OH)₂
Moles HCl - Molar mass: 36.46g/mol-
25.6g HCl * (1mol / 36.46g) = 0.702 moles HCl
For a complete reaction of 0.702 moles HCl are required:
0.702 moles HCl * (1mol Ba(OH)₂ / 2mol HCl) = 0.351 moles of Ba(OH)₂
As there are just 0.306 moles, limiting reactant is Ba(OH)₂
That means the maximum amount of BaCl₂ produced is:
0.306 moles Ba(OH)₂ * (1mol BaCl₂ / 1 mol Ba(OH)₂) = 0.306 moles BaCl₂
In mass -Molar mass BaCl₂: 208.23g/mol-
0.306 moles BaCl₂ * (208.23g / mol) = 63.7g BaCl₂
What happens during chemical reactions?
O A. The total amount of energy changes
O B. Total mass increases in the products
O C. Energy is given off or absorbed
O D. Atoms are changed into new elements
Answer:
D. Atoms are changed into new elements.
Explanation:
atoms rearrange to form one or more different substances.
Hope that helps!!!
Sorry if its worng :(
Answer:
It's actually C. Energy is given off or absorbed.
Explanation:
"All chemical reactions involve changes in energy. This may be a change in heat, electricity, light, or other forms of energy. Reactions that absorb energy are endothermic. Reactions that release energy are exothermic."
-LibreTexts Chemistry
Write the name for CH2.
2. K2SO4 + NaOH what comes next ?
Answer: [tex]K_2SO_4(aq)+2NaOH(aq)\rightarrow Na_2SO_4(aq)+2KOH(aq)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The balanced chemical equation is:
[tex]K_2SO_4(aq)+2NaOH(aq)\rightarrow Na_2SO_4(aq)+2KOH(aq)[/tex]
Is the cell wall factory part or worker? And please explain what the worker or factory part does. (Don’t tell me it’s on quizlet bc I can’t find it)
A simplified version of the Periodic Table of the Elements is provided. What type of elements would you most likely find in the circles portion?
Answer:
Transition elements are present in this region.
Explanation:
What is the name of a molecule which is composed of two
phosphorous atoms and four sulfur atoms?
The name of a molecule which is composed of two phosphorous atoms and four sulfur atoms is phosphorus sulphide.
What is molecule ?According on the context, the word may or may not include ions that meet this requirement. A molecule is a collection of two or more atoms bound together by attractive forces known as chemical bonds.
A molecule is the smallest unit of any material that is composed of one or more elements and is capable of existing independently while maintaining all of the substance's physical and chemical characteristics. Further atom division occurs within molecules. For instance, the symbols for the oxygen atom and molecule are O and O2, respectively.
Thus, The name of a molecule which is composed of two phosphorous atoms and four sulfur atoms is phosphorus sulphide.
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Draw a Lewis structure for ketene, C2H2O , which has a carbon‑carbon double bond. Include all hydrogen atoms and show all unshared electron pairs. None of the atoms bears a formal charge, and all atoms have octets (except for hydrogen atoms, which have duets).
Answer: The lewis dot structure is attached below.
Explanation:
A Lewis dot structure is defined as the representation of atoms having electrons around the atom where electrons are represented as dots.
A ketene is an organic compound having general formula R′R″C=C=O, where R and R' are two different/same monovalent chemical groups.
The given chemical compound having formula [tex]C_2H_2O[/tex] is represented as [tex]H_2-C=C=O[/tex].
Total number of unshared electrons = 4 (left on oxygen atom only)
The lewis dot structure of [tex]C_2H_2O[/tex] is given in the image below.
Calculate the mass of vanadium(V) oxide (V2O5) that contains a billion (1.000e9) vanadium atoms. Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits._______
Answer:
1.510 × 10⁻¹³ g
Explanation:
Step 1: Given data
Number of atoms of vanadium: 1.000 × 10⁹ atoms
Step 2: Calculate the molecules of V₂O₅ that contain 1.000 × 10⁹ atoms of V
Each molecule of V₂O₅ has 2 atoms of V.
1.000 × 10⁹ atom V × (1 molecule V₂O₅/2 atom V) = 0.5000 × 10⁹ molecule V₂O₅
Step 3: Calculate the moles corresponding to 0.5000 × 10⁹ molecules of V₂O₅
We will use Avogadro's number: there are 6.022 × 10²³ molecules of V₂O₅ in 1 mole of V₂O₅.
0.5000 × 10⁹ molecule × (1 mol/6.022 × 10²³ molecule) = 8.303 × 10⁻¹⁶ mol
Step 4: Calculate the mass corresponding to 8.303 × 10⁻¹⁶ moles of V₂O₅
The molar mass of V₂O₅ is 181.88 g/mol.
8.303 × 10⁻¹⁶ mol × 181.88 g/mol = 1.510 × 10⁻¹³ g
Which of the following statements about tobacco use is not true?
a. Nicotine narrows blood vessels and puts added strain on the heart.
b. Smoking improves athletic performance.
c. Smoking can wreck lungs.
d. Nicotine in smokeless tobacco is addictive.
Explanation:
b and c statements are not true
if it helps you then plzz mark me brainliest
Answer:
B.) Smoking improves Athletic performance
Explanation:
What are natural disasters that are NOT in Florida?
A: Tsunami
B: Earth quakes
C: Sand Storm
D: Hurricanes
E: Storm
i’ll give brainliest! help :))!!
Answer: increase the bicycles acceleration hope this helps :]
Explanation:
2. How many moles are in 2.43 x 1024 particles of Carbon Monoxide
(CO)?
Answer:
= 14.63 × [tex]10^{45}[/tex] particles.
Explanation:
According to Avogadro's priciple:
1 mole of any substance is 6.02 × [tex]10^{23}[/tex] particles
∴ 2.43 x [tex]10^{24}[/tex] moles × 6.02 × [tex]10^{23}[/tex]
= 14.63 × [tex]10^{45}[/tex] particles.
I hope this was clear and easy to understand.
In an experiment to displace
from copper sulfate, 6.5g of Zinc was
added to an excess of copper(ii) sulfate
Solution. The copper was fitered off,
washed and dried. The mass of
Copper obtained was 48 g. Calculate
the percentage yield of copper?
The percentage yield of copper = 76%
Further explanationGiven
6.5g of Zinc
The mass of Copper: 4.8 g
Required
The percentage yield of copper
Solution
Reaction
Zn+CuSO₄⇒Cu+ZnSO₄
mol Zn :
= mass : Ar Zn
= 6.5 g : 65,38 g/mol
= 0.0994
From the equation, mol ratio of Zn : Cu = 1 : 1, so mol Cu = 0.0994
Mass Cu (theoretical) :
= mol x Ar Cu
= 0.0994 x 63,546
= 6.316 g
%yield = (actual/theoretical) x 100%
%yield = (4.8/6.316) x 100%
%yield = 76%