Answer:
FeCl₃ is present in excess.
Explanation:
Given data:
Number of moles of FeCl₃ = 6 mol
Number of moles of oxygen = 3 mol
Excess reactant = ?
Solution:
Chemical equation:
4FeCl₃ + 3O₂ → 2Fe₂O₃ + 6Cl₂
Now we will compare the moles of reactant with product.
FeCl₃ : Fe₂O₃
4 : 2
6 : 2/4×6= 3
FeCl₃ : Cl₂
4 : 6
6 : 6/4×6= 9
O₂ : Fe₂O₃
3 : 2
O₂ : Cl₂
3 : 6
Less number of moles of product are formed by the oxygen thus it will act as limiting reactant while FeCl₃ is present in excess.
Consider the following balanced equation:
P4(s) + 6F2(e)
4PF3(g)
If 1.25 moles of P4(s) is reacted with 6 moles of F2(g), How many moles of PF3(e) are
produced?
O 5 moles
4 moles
O 6 moles
O 3 moles
Moles of PF₃ : 4
Further explanationA reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction
[tex]\tt P_4(s)+6F_2(g)\rightarrow 4PF_3(g)[/tex]
1.25 moles of P₄(s) is reacted with 6 moles of F₂(g)
Limiting reactant : the smallest ratio (mol divide by coefficient)
P₄ : F₂ =
[tex]\tt \dfrac{1.25}{1}\div \dfrac{6}{6}=1.25\div 1\rightarrow F_2~limiting~reactant(smallest~ratio)[/tex]
mol PF₃ based on mol of limiting reactant(F₂), so mol PF₃ :
[tex]\tt \dfrac{4}{6}\times 6~moles=4~moles[/tex]
3. What do platelets do?
10 points
O a. help build the number of white blood cells
O b. help build the number of red blood cells
O c. help stop bleeding
O d. gives blood its color
Answer:
C help stop bleeding
Explanation:
Platelets stop bleeding by clumping and forming plugs in blood vessel injuries
2. How many moles are found in 3.2 x 1023 atoms of NaCl?
Answer:
0.53 mol NaCl
General Formulas and Concepts:
Chemistry - Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
3.2 × 10²³ atoms NaCl
Step 2: Identify Conversions
Avogadro's number
Step 3: Convert
[tex]3.2 \cdot 10^{23} \ atoms \ NaCl(\frac{1 \ mol \ NaCl}{6.022 \cdot 10^{23} \ atoms \ NaCl} )[/tex] = 0.531385 mol NaCl
Step 4: Check
We are given 2 sig figs. Follow sig fig rules and round.
0.531385 mol NaCl ≈ 0.53 mol NaCl
A 500 mL sample of drinking water contains 0.001 mg of mercury. How many ppb is this?
Answer:
The value is [tex]k = 2 \ ppb[/tex]
Explanation:
From the question we are told that
The volume of the drinking water is [tex]V = 500 \ mL = 500 *10^{-3} \ L = 500 *10^{-6} \ m^3[/tex]
The mass of mercury it contains [tex]m_c = 0.001 \ mg = 0.001 *10^{-3} \ g = 0.001 *10^{-6}\ kg[/tex]
Generally the mass of water is mathematically represented as
[tex]m = V * \rho[/tex]
Here [tex]\rho[/tex] is the density of water with value [tex]\rho = 1000 \ kg/m^3[/tex]
So
[tex]m = 500 *10^{-6 }* 1000[/tex]
=> [tex]m = 0.5 \ kg[/tex]
Generally ppb mean part per billon , and 1 billon is 100,000,000
So the part per billon which this represents is mathematically represented as
[tex]k = \frac{0.001 *10^{-6}}{ 0.5} * 100 000 000[/tex]
=> [tex]k = 2 \ ppb[/tex]
Answer:
2 ppb
Explanation:
I got it right in class!
Hope this Helps!! :))
what kind of change forms a chemical reaction?
a. a phase change
b. a solubility change
c.a physical change
d. a chemical change
Answer:
a chemical change is correct answer
Why does a chemical equation be balanced?
Answer:
Law of conservation of matter
Explanation:
Compared to the valence electrons of a nonmetallic atom, the valence electrons of a metallic atom are generally A) greater in number and less strongly held B) fewer in number and less strongly held C) fewer in number and more strongly held D) greater in number and more strongly held
Answer:
B) fewer in number and less strongly held
Explanation:
If we look closely at the periodic table from left to right, we will notice that the number of valence electrons increases steadily as we move across the periodic table from left to right.
Metals are mostly at the left hand side of the periodic table while nonmetals are found at the righthand side of the table.
Metals are less electronegative than nonmetals and typically have a lower effective nuclear charge than nonmetals hence the fewer valence electrons of metals are less strongly held(due to less effective nuclear charge) than those of nonmetals.
5. Where are red blood cells produced?
10 points
a. in the heart
b. in the blood vessels
c. in bone marrow
d. in the plasma
Answer:
C
Explanation:
In the bone marrow, red blood cells are produced
Write True/False against the following statements and also correct the false statement.
Greater the calorific value better is the fuel.
Answer:
I think it is true you should go for true
living things
O cell wall
O chloroplasts
O Organelle
O organisms
How many moles of sodium cyanide (NaCN) would be needed to
produce 4.2 moles of sodium sulfate (Na2SO4)? (4 points)
H2SO4 + 2NaCN → 2HCN + Na2SO4
O 2.1 mol NaCN
O 4.2 mol NaCN
O 8.4 mol NaCN
O 12.0 mol NaCN
Answer:
c
Explanation:
8.4
For the reaction H₂SO₄ + 2NaC≡N → 2HC≡N + Na₂SO₄, we have that 8.4 moles of sodium cyanide are needed to produce 4.2 moles of sodium sulfate (option C).
The reaction between sodium cyanide and sulfuric acid is:
H₂SO₄ + 2NaC≡N → 2HC≡N + Na₂SO₄
We can find the number of moles of sodium cyanide, assuming that it is the limiting reactant and knowing that 2 moles of it produce 1 mol of sodium sulfate, as follows:
[tex] n_{NaC\equiv N} = \frac{2\: moles\: NaC\equiv N}{1 \: mol\: Na_{2}SO_{4}}*4.2 \: moles\: Na_{2}SO_{4} = 8.4 \: moles [/tex]
Therefore, 8.4 moles of sodium cyanide are needed to produce 4.2 moles of sodium sulfate (option C).
Learn more about limiting reactants here:
brainly.com/question/14225536
I hope it helps you!
Becquerel’s experiment consisted of four steps.
1. Get a sample of a uranium salt.
2. Expose the salt to sunlight.
3. Expose photographic plates to the salt.
4. Develop the plates.
A change in which step led to Becquerel’s discovery of radioactivity?
1
2
3
4
Answer its Ccccccccccccccccccccccccc
Select the correct answer from each drop-down menu
The rock cycle
Answer:
The picture?
Explanation:
Please the picture
This makes no sence. Please put the picture up for us to answer. Thanks!
Which of the following statements about energy is NOT TRUE?
O Energy is the ability to do work or cause change.
Energy can neither be created nor destroyed.
When you use energy, the total amount of energy decreases.
Energy can be changed from one form to another.
Answer:
when you use energy , the total amount of energy decreases.
Select the item with the highest embodied energy for a typical American. A. Organically grown oranges transported 500 miles by truck B. Pineapple imported by air from Costa Rica C. Sweet corn produced locally using synthetic fertilizer D. Green beans grown in the backyard garden
Answer:
B: Pineapple imported by air from Costa Rica
Explanation:
Embodied energy is the total energy that is required for the extraction, processing, manufacture and transportation of materials to its intended usage destination.
This means highest embodied energy will be the work that demands the most energy for extraction, processing, manufacture and transportation of materials to its intended usage destination.
Looking at the options given, the one with the highest embodied energy will be "Pineapple imported by air from Costa Rica". This is because other options are done locally and thus will consume lesser energy and processing time unlike the pineapple that is coming from another country and by air.
Explain why PCI5 can be formed whereas
PI5 cannot be formed.
Answer:
highly unstable
Explanation:
also, due to repulsion of lone pairs and instability it breaks and can't form PI5
hope that helps....
Of the elements Pt, V, Li, and Kr, which is a nonmetal?
workout the oxidation number of phosphorus in the following compound H3PO3
Answer:Phosphorus ahs an ocxidation number of 3. Phosphoric acid, H3PO3 has structure where there is one hydrogen (-H), two hydroxyl groups (-OH) and one oxgen (=O) attached to the central phosphorus P
Using the normal rules, H= +1, O = -2, OH = -1 and balancing out the "charges" we get P =+3
Explanation:
4. The blood vessels, heart and the blood make up
WkoOxVrg/vie...
o
10 points
a. 1/3 of our body
b. the respiratory system
c. 1/4 of our body
O d. the cardiovascular system
Answer:
D, the cardiovascular system
Explanation:
The Cardiovascular System is the system at which blood circulates through our body
why is newtons first law of motion important to science plsss help :(
Explanation:
every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force
Answer: Newton's 1st law of motion explains how things move and how forces work on their movement, which makes it an extremely important discovery.
Explanation: If we were to place an object into space, we could observe how it behaves without any external influences.
what is it called when a substance that is dissolved in liquid
. A certain quantity of electricity is passed through an aqueous
solution of AgNO3 and cupric salt solution connected in series. The
amount of silver deposited is 1.08 g. What is the amount of copper
deposited ? (Atomic wt. of Cu=63.54, Ag=108 g/mole).
Answer:
0.32 g
Explanation:
First, we find the number of moles n of silver deposited.
n = m/M where m = mass of silver deposited = 1.08 g and M = Atomic weight of silver = 108 g/mol
n = m/M = 1.08 g/108 g/mol = 0.01 mol
Now, the quantity of electricity Q = nF where n = number of moles of silver = 0.01 mol and F = Faraday's constant = 96500 C/mol
Q= nF = 0.01 mol × 96500 C/mol = 965 C
By the chemical equation for copper,
Cu²⁺ + 2e ⇒ Cu
2 moles of electrons deposits 1 mol of copper, that is
2 × 96500 C deposits 1 mol of copper, then 965 C will deposit x mol
x = 1 mol × 965 C/2 × 96500 C = 1/200 mol = 0.005 mol of copper
So, we find the mass of 0.005 mol of copper using
n = m/M where m = mass of copper deposited = unknown and M = Atomic weight of copper = 63.54 g/mol and n = number of moles of copper = 0.005 mol
m = nM
= 0.005 mol × 63.54 g/mol
= 0.32 g
Can someone help me on this? (The second one has the same options as the first one)
Answer:
EASY ITS BUILT DIFERENT
Explanation:
Identify the source of energy in a chemical reaction.
The green pigment required for photosynthesis is:
A. glucose
B. chloroplast
C. chlorophyll
D. carbon dioxide
Why is Newton's first law of motion important to science?
Answer:
Newton's laws are very important because they tie into almost everything we see in everyday life. These laws tell us exactly how things move or sit still, like why you don't float out of bed or fall through the floor of your house.
Explanation: Newton's laws of motion are important because they are the foundation of classical mechanics, one of the main branches of physics. Mechanics is the study of how objects move or do not move when forces act upon them.
A 100 gram sample of naturally occurring boron contains 19.78 % of B-10 and 80.22 % of B-11. Which numerical setup can be used to determine the atomic mass of naturally occurring B
Answer:
The required numerical set up is;
RAM = (19.78% * 10) + (80.22% * 11)
Explanation:
The relative atomic mass is the sum of the products of the mass of each isotope and its relative abundance.
Hence the relative atomic mass of Boron is obtained form;
RAM = (19.78% * 10) + (80.22% * 11)
RAM = (1.978) + (8.8242)
RAM =10.8022
A self-contained system within a larger system? *
Answer:
subsystems.
Explanation:
A self-contained system within a larger system. system. A group of interacting or interdependent elements forming a complex whole, as in all the factors or variables in an environment or all the variables that might affect a science experiment.
Which statement describes a property that is unique to metalloids?
Answer:
Posses both metal and non metal property
This question most likely has answer choices. The answer choices are as follows:
Metalloids are shiny.Metalloids are semiconductive.Metalloids are solid.Metalloids are brittle.The answer is Metalloids are semiconductive (2nd option).
Because of this, railroads use the reaction to provide molten steel to weld steel rails together when laying track. When 23.00g of iron(III) oxide reacts with aluminum metal, how many moles of molten iron (Fe) are formed
Answer:
0.288 mole of Fe.
Explanation:
We'll begin by calculating the number of mole present in 23.00g of iron(III) oxide (Fe2O3). This can be obtained as follow:
Mass of Fe2O3 = 23 g
Molar mass of Fe2O3 = (56×2) + (16×3)
= 112 + 48
= 160 g/mol
Mole of Fe2O3 =?
Mole = mass /Molar mass
Mole of Fe2O3 = 23 / 160
Mole of Fe2O3 = 0.144 mole
Next, we shall write the balanced equation for the reaction. This is given below:
2Al + Fe2O3 —> Al2O3 + 2Fe
From the balanced equation above,
1 mole of Fe2O3 reacted to produce 2 moles of Fe.
Finally, we shall determine the number of mole of Fe produced by the reaction of 23 g (i.e 0.144 mole) of Fe2O3. This can be obtained as illustrated below:
From the balanced equation above,
1 mole of Fe2O3 reacted to produce 2 moles of Fe.
Therefore, 0.144 mole of Fe2O3 will react to produce = 0.144 × 2 = 0.288 mole of Fe.
Thus, 0.288 mole of Fe is obtained from the reaction.