Answer:
8759g
Explanation:
Given parameters:
Number of moles = 19moles
Unknown:
Mass of PbI₂ = ?
Solution:
To solve this problem, we first find the molar mass of PbI₂;
Molar mass of PbI₂ = 207.2 + 2(126.9) = 461g/mol
Mass of PbI₂ = number of moles x molar mass = 19 x 461
= 8759g
5. How many mol are in 2.5x10 23
atoms of copper?
a. 0.42 mol Cu (yellow)
b.4.2 mol Cu (pink)
c. I.8 mol Cu (blue)
Does N2F2 obey the octet rule? Explain.
Pls help (there is a pic)
Need help on this please help
Answer:
The answer is: The Earth rotates on its axis.
2 Students were asked to identify the location of elements in the periodic table based on clues
printed on game cards.
Element 1
• Shiny black solid
• Metalloid
• 3 valence electrons
• 2 energy levels
Element III
• Colorless gas
• Nonmetal
• 8 valence electrons
• 5 energy levels
Element II
• Steel-gray solid
• Brittle metalloid
• 5 valence electrons
• 4 energy levels
Element IV
• Silvery-white solid
• Soft metal
• 2 valence electrons
• 6 energy levels
Based on the data, which periodic table shows the correct location of the four elements?
Answer:
B
Explanation:
I took the test
Element 1 is silicon. An element's atoms all contain the same amount of protons, but its electron and neutron counts might vary.
What is element?A material that cannot be destroyed chemically is referred to as a chemical element. Although chemical processes cannot modify an atom, nuclear reactions can create new elements.
The quantity of protons an element has defines it. An element's atoms all contain the same amount of protons, but its electron and neutron counts might vary. Ions are produced by altering the electron to proton ratio, whereas isotopes are produced by altering the neutron count.
118 known elements are present. A study is being done to create element 120.1. The periodic table will have to be modified to include element 120 after it has been created and validated. Element 1 is silicon.
Therefore, the element 1 is silicon.
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When electricity passes through water (H20), the water breaks down to form
hydrogen gas (H2) and oxygen gas (02).
Which equation represents this chemical reaction?
A.2H20+ 02 – 2H2
B.2H2 + 02 – 2H20
C.2H20 + 2H2 – 02
D.2H20 - 2H2 + O2
Answer:
A. Because you have to simplify
Answer:
decomposition
Explanation:
i dont cap
How do the properties of compounds compare to the properties of elements from which they are made
Answer:
When elements combine in a chemical reaction to form compounds, their individual identity is lost. Thus, the properties of elements change when they form chemical bonds with other elements to form compounds. For example, the compound water is made up of water and hydrogen.
22. Julie took a road trip to Canada. She traveled a total of 1,750 miles in 25 hours.
Calculate Julie's average speed.
Answer:
s = 70 m/h
Explanation:
Given data:
Distance traveled = 1750 mile
Time taken = 25 hours
Average speed = ?
Solution:
Average speed can be calculated by dividing distance traveled over time taken.
Formula:
s = d/t
by putting values,
s = 1750 mile / 25 hour
s = 70 m/h
what is the answer pls help me
Answer:fist one 2 and 3 next
Explanation:
i looked it up
Which of the following are considered physical changes?
[mark all correct answers]
a. Boiling water
b. Crushing a can
c. Burning wood
d. Rusting nail
e. Shredding paper
What is the molality of a solution that has 6 mol of CaCl2 in 3 kg of water?
A. 2 m
B. 0.5 m
C. 6 m
D. 3 m
Answer:
2m
Explanation:
Hope this helps :)
Answer:
Answer is B.
Explanation:
3mol/6kg = 0.5m
in the box next to your answer.
(b) Complete the sentence by putting a cross
An atom of an element always contains
D A
more protons than neutrons
B equal numbers of protons and neutrons
oc
more electrons than protons
D equal numbers of protons and electrons
Answer:
D equal numbers of protons and electrons
Explanation:
An atom of an element will always contain equal number of protons and electrons.
Atoms are electrically neutral because the number of positive charges and negative charges within them are always equal.
An atom is the smallest indivisible particles of an element that takes part in a chemical reaction. The positively charged particles within an atom are the protons. The negatively charged particles within an atom are the electrons.For;
So number of protons = number of electrons within an atom.
(URGENT PLS HELP) Identical plants were grown in identical conditions, except one received fertilizer and water, while the other received only water.
Which best describes why the experiment either can be replicated or not replicated?
A.) The experiment can be replicated because the results were indicated.
B.) The experiment can be replicated because both plants had identical conditions.
C.) The experiment can not be replicated because no two plants are exactly the same.
D.) The experiment can not be replicated because the methods are not fully explained
Answer: It would be D, it can not be replicated becuz the methods are different. one plant had water and fertilizer, while the other only had water. You cannot replicate it you will have different outcomes because of the methods. I hope this helps you the answer is D
Explanation:
Answer:
personally I do not think that the experiment can be replicated and if it is replicated they might not get the same result.
Explanation:
It depends on how much fertilizer they used and since plants are different it might give different results. I know this isn't going to help you but go with your gut.
Some metal chips with a total volume of 3.29 cm3 are placed on a piece of paper and weighed. The combined mass is found to be 18.43 g, and the paper itself weighs 1.2140 g. Calculate the density of the metal to the proper number of significant figures.
Answer:
d = 5.23 g/cm³
Explanation:
Given data:
Volume of metal chips = 3.29 cm³
Mass of metal chips and paper = 18.43 g
Mass of paper = 1.2140 g
Density of metal = ?
Solution:
Mass of metal = combined mass - mass of paper
Mass of metal = 18.43 g - 1.2140 g
mass of metal = 17.22 g
Density:
d = mass/ volume
d = 17.22 g/ 3.29 cm³
d = 5.23 g/cm³
which of the following gas samples would have the largest volume, if all samples are at the same temperature and pressure?
A. 0.498 moles CO2
B. 19.91 grams of Ar
C. 3 x 10^ 23 molecules of H2
D. They would all have the same volume
Answer:
C. 3 x 10^ 23 molecules of H2
Explanation:
How many grams of aluminum oxide are produced according to the reaction below given that you start with 13.2 grams of Al and 13.2 grams of O2?
Reaction: 4AI + 3 02 → 2A1203
Answer: 24.87g Al2O3
Explanation: Aluminum is our limiting reagent
[tex]13.2g Al * \frac{1 mol Al}{26.98 g} * \frac{2 mol Al2O3}{4 mol Al} = 0.244 mol Al2O3[/tex]
First of all we need to convert the grams of aluminium to moles, then use the molar fraction of the balanced equation (4 moles of aluminium equals 2 of aluminum oxide).
If we made the same procedure with the oxigen we get a 0.273 mol of Al2O3, therefore the O2 is the excess reagent.
The last step is convert the moles of the limiting reagent to grams
[tex]0.244 mol Al_{2} O_{3} * \frac{101.96g}{1mol Al2O3} = 24.87g Al2O3[/tex]
And that´s it!
Question: Based on this information, which type of light is more likely to damage the material?
1)The gamma ray light is more likely to damage the material because the gamma ray light can
pull energy out of the material when it passes through the material.
b
2)The X-ray light is more likely to damage the material because the X-ray light bounces off of
the material, which means that it has more energy.
3)There is no way to know because they are two different types of light, and different types of
light can change a material in different ways.
4)Neither type of light is likely to damage the material because the material does not take in
energy from either the X-ray light or the gamma ray light.
Scroll for more
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6
Save and Continue
lol
Answer: It will be D which is number 4........
Neither type of light is likely to damage the material, because the material does not take in energy from either the X-ray light or the gamma ray light.
Explanation:
Why do scientists need a universal system to classify organisms?
Answer:
classification enables scientists to explain the relationships between organisms, which is helpful in trying to reconstruct the evolutionary roots of a particular species. Finally, taxonomic names provide unique descriptive names for organisms. This is sometimes an issue with common names of animals.
Explanation:
Found in the Internet
How much iron is present in 1.3400 grams of iron (III) oxide?
Answer:
69.94%
Explanation:
69.94% IRON IS PRESENT
For the following reaction, how many grams of H2O will be produced if you react 2.4 grams of NH3?
4 NH3 + 5 O2 → 4 NO + 6 H2O
Answer:
ammonia is the answer
Explanation:
2.54 grams of [tex]H_{2}O[/tex] will be produced if you react 2.4 grams of [tex]NH_{3}[/tex]
The chemical reaction is given below.
[tex]4NH_{3} + 5O_{2}[/tex] → [tex]4N_{}O + 6H_{2}O[/tex]
Calculation,
Since, 17 grams of [tex]NH_{3}[/tex] produce 18 grams of [tex]H_{2}O[/tex].
2.4 grams of [tex]NH_{3}[/tex] produce 18×2.4/17 grams of [tex]H_{2}O[/tex].
So, 2.4 grams of [tex]NH_{3}[/tex] produce 2.54 grams of [tex]H_{2}O[/tex].
So, the correct option is A.
What is chemical reaction?The process in which one or more chemicals is transform into one or more chemicals is called Chemical reaction.
Example: iron and oxygen reacts with each other to form rust.
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8.
Which of the following is NOT a desirable property for a material that is to be made ir
window?
A) hard
B) waterproof
C) opaque to light
D) rigid
Four oranges were placed in a series circuit. Approximately what voltage did this produce?
Answer:
Four times the original amount if only one orange was used
Explanation:
We can assume that the oranges all have equal voltages. Connecting them in series will have an increasing effect on the voltage delivered. In our case, this will produce 4 times the voltage of the circuit when only one orange is used.
Whenever simple cells are connected in series, the voltages of the individual cells are added up to form the voltage of the whole circuit.
Let us assume that the voltage of each of the oranges is approximately 0.9 volts. The Voltage produced when the 4 oranges are joined in series is 0.9 + 0.9 + 0.9 + 0.9 = 3.6 volts
How many mL are in 0.024 quarts (qt)
Answer:
99898
Explanation:
a student wants to determine if different types of car wheels impact how far a car will travel after leaving a ramp. The same car and the same ramp or used for each trial run. The data collected are shown in the table.
A. Large plastic Wheels
B. Large rubber Wheels
C. Small rubber Wheels
D. Small plastic Wheels
Answer:
b. it has the longest average distance
The molar mass of NaCl is 58.44 g/mol. What is the molarity of a solution that
contains 120 g of NaCl in 0.750 L of solution?
0.649 M
3.00 M
2.74 M
2.05 M
Which is not a property of an Acid?
A) low pH
B) Bitter
C) Burning Effects
D) Sour
Answer:
b bitter
Explanation: can i have brainlist please
Silicon carbide, SiC, is commonly known as carborundum. This hard substance, which is used commercially as an abrasive, is made by heating SiO2 and C to high temperatures.
SiO2(s) + 3C(s) → SiC(s) + 2CO(g)
How many grams of SiC form when 3.00 g of SiO2 and 4.50 g of C are allowed to react?
Mass of SiC = 2 g
Further explanationGiven
Reaction
SiO₂(s) + 3C(s) → SiC(s) + 2CO(g)
3.00 g of SiO₂
4.50 g of C
Required
mass of SiC
Solution
mol SiO₂ (MW=60,08 g/mol) :
= 3 g : 60.08 g/mol
= 0.0499
mol C(Ar = 12 g/mol) :
= 4.5 g : 12 g/mol
= 0.375
mol : coefficient of reactants =
SiO₂ : 0.0499/1 = 0.0499
C : 0.375/3 = 0.125
SiO₂ as a limiting reactant(smaller ratio)
Mol SiC based on mol SiO₂ = 0.0499
Mass SiC :
= mol x MW
= 0.0499 x 40,11 g/mol
= 2 g
how many formula units are in 0.96 moles of H2O
Answer:
18.02 amu
Explanation:
10 pointsss Where are tsunamis likely to originate?
Answer:
Pacific Ocean
Explanation:
Describe subscripts in chemical equations.
