Answer:
Mass of CsXeF₇ = 99.3 g
Explanation:
Given data:
Mass of CsF = 37.8 g
Mass of CsXeF₇ produced = ?
Solution:
Balance chemical equation:
CsF + XeF₆ → CsXeF₇
Number of moles of CsF:
Number of moles = mass/molar mass
Number of moles = 37.8 g/ 152 g/mol
Number of moles = 0.25 mol
Now we will compare the moles of CsF with CsXeF₇ from balance chemical equation:
CsF : CsXeF₇
1 : 1
0.25 : 0.25
Mass of CsXeF₇ :
Mass = number of moles × molar mass
Number of moles = 0.25 mol × 397.2 g/mol
Mass = 99.3 g
Answer:
98.84
Explanation:
what are the 20 element
Answer:
you shoudl ask this question more clearly?
Explanation:
Answer:
The 20th Element is Calcium (Ca).
The 20 Elements are:
Hydrogen
helium
lithium
berilium
boron
carbon
nitrogen
oxygen
flourine
neon
sodium
magnesium
aluminium
silicon
phosphorus
sulphur
chlorine
argon
potassium
calcium
susan calculates the heat energy released when water condenses using Q = mCΔT. explain why her calculation is incorrect?
You need to find the entropy of fusion in order to find this out.
Unit: Scientific Measurement“One, Two, and More Step Problems” – Wksh #2
1.How many g are equal to 345.7 mg?
2.Change 0.00765 kL into mL.
3.How many seconds are there in 2.5 days?
4.How many minutes are there in 1.000 week?
5.How many seconds long is this chemistry class if it lasts 40.0 minutes?
6.A chemistry student’s height is measured at 68.5 inches. How tall is the student in cm?
7.This same chemistry student has a weight of 155 lbs. What is the student’s weight ingrams? (16oz=1lb, 1 oz = 28.34 g)
8.A homerun in a baseball game was measured at 450 feet. How many meters is this equalto?
9.Mount Everest is approximately 8,000 meters high. How many miles high is MountEverest?
10.A 5.0 km race is scheduled for this weekend. How many miles is this race?
Answer:
1. 0.3457g
2. 7650mL
3. 216000 seconds
4. 10080minutes
5. 2400 seconds
6. 173.99cm
7. 70283.2g
8. 137.16metres
9. 4.968miles
10. 3.105miles
Explanation:
1. 1000mg = 1g
345.7 mg = 345.7/1000
= 0.3457g
2. 1kL = 1000000mL
0.00765 kL = 0.00765 × 1000000
= 7650mL
3. 1 day = 86400s
2.5 days = 2.5 × 86400
= 216000 seconds
4. 1 week = 10080minutes
1.000weeks is equivalent to 1 week, hence there are 10080minutes in 1.000week.
5. 1minute = 60seconds
40.0minutes = 40 × 60
= 2400seconds.
6. 1 inch = 2.54cm
68.5inches = 68.5 × 2.54
= 173.99cm
7. 1Ib = 16oz
155Ibs = 155 × 16
= 2480 oz
1 oz = 28.34 g
2480oz = 2480 × 28.34
= 70283.2g
8. 1 foot = 12 inches
450 feet = 450 × 12
= 5400inches
1 inch = 0.0254metres
5400 inches = 5400 × 0.0254
137.16metres
9. 1 metre = 0.000621 mile
8000 metres = 8000 × 0.000621
= 4.968miles
10. 1 kilometers = 1000 metres
5km = 5 × 1000
= 5000metres
1 metre = 0.000621 mile
5000metres = 5000 × 0.000621
= 3.105miles
The cell membrane is found in all cells *
True
False
Answer:
true
Explanation:
all cells will have plasma membranes
Which term describes erosion?
A.creates small particles
B. Hardens rock fragments
C. Transports solid materials
D. dissolves rock components
Please i need to pass this!
Please try
It is incorrect because it should have a total of eight electrons with two electrons between each H and O
Further explanationLewis structure shows the form of bonds that occur in the valence electrons of an element or compound
This bonding usually occurs in covalent bonds
Valence electrons are electrons used in a chemical bond
The main group elements usually have valence electron configurations in the ns and np subshells, While the transition elements in the subshells (n-1) d and ns.
Element O has 6 valence electrons
Element H has 1 valence electron
To achieve stability, the element O needs 2 more electrons which are obtained from 2 electrons from the H element, while the H element needs 1 electron to be stable
So that a covalent bond is formed
3. Which of the following is used to calculate the average atomic mass of an element?
what mass of gold, Au, contains the same number of atoms as 9.0 g of aluminum Al
Answer:
55.16 grams of gold contain same number of atoms as 7.72g AI contain
True/False: Units for gas density are grams/L
Answer:
false
Explanation:
You are using a calorimeter to calculate the specific heat capacity of a metallic ore. The calorimeter contains 0.50 kilograms of water at room temperature (22 °C). We heat the ore in boiling water and then drop the metal into the calorimeter and wait for the water and metal to reach the same temperature. The mass of the ore is 3.5 kilograms. We find that the water has increased in temperature to 24.3 °C. Recall that the specific heat of water is 4.18 J/g–°C. Calculate the specific heat capacity of the ore.
In the calorimeter, the heat received is the same as the heat released
Q abs = Q release
Heat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
Q released by a metallic ore and absorbed by water at calorimeter
Q ore = Q water
Q waterm = 0.5 kg = 500 g
c = 4.18 J/g–°C.
Δt = 24.3 - 22 = 2.3
[tex]\tt Q=m.c.\Delta t\\\\Q=500\times 4.18\times 2.3=4807~J[/tex]
the specific heat capacity of the ore.Q ore = Q water = 4807 J
m ore = 3.5 kg = 3500 g
Δt = 100 - 24.3 = 75.7
[tex]\tt 4807=3500\times c\times 75.7\\\\c=0.018~J/g^oC[/tex]
what happens to the molecules as water freezes PLS HELP THIS IS DO TODAY
During freezing, water molecules lose energy and do not vibrate or move around as vigorously. This allows more stable hydrogen-bonds to form between water molecules, as there is less energy to break the bonds. ... Thus water expands as it freezes, and ice floats atop water.
When water molecule freezes, the water molecules have slowed down enough that their attractions fixed them into fixed positions.
What do you mean by freezing ?The term freezing is defined as a phase transition where a liquid converted into a solid when its temperature is lowered below its freezing point.
The freezing point is the temperature at which a liquid turns solid. In the freezer, for example, water-filled ice cube trays.
Water molecules freeze in a hexagonal pattern, with molecules further apart than when the water was liquid. It is worth noting that the molecules in ice would be vibrating.
Thus, When water freezes, the water molecules slow down to the point where their attractions arrange them into fixed positions.
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Which of the following best describes hair? O Hair is made of mostly tightly packed living cells Hair does not help control body temperature. O Hair growth occurs in the hair follicle O Hair grows at 2.5mm a month.
Answer:
(A) Hair is made of mostly tightly packed living cells.
Explanation:
i just took the exam :) yw
a like would be nice thanks!
Answer:
A
Explanation:
Just did the exam :) Good Luck!
How do the gravitational forces change as the objects get closer to each other?
Answer:
you can use the example of two magnets
Answer: The gravitational force Increase as the objects get closer.
Explanation:
What is the picture displayed?
Proton , atom , element, cell
Answer:
I can't see the picture so I can't answer
Which of the following characteristics is shared by both primary and secondary consumers? I need it quick it please
A. Uses the Sun's radiant energy of produce food
B.The first step in an food chain diagram
C. Eats only plants to gain needed energy
D.Gains energy by eating other living things
Answer:
Gains energy by eating other living things
The statement 'gains energy by eating other living things' is a characteristic shared by both primary and secondary consumers (Option D).
Producers (e.g. algae and plants) are autotrophic organisms that generate their own food.Primary consumers and secondary consumers are heterotrophs that need to eat other organisms to survive.Primary consumers can be, for example, herbivores, whereas secondary consumers can be carnivores.In conclusion, the statement 'gains energy by eating other living things' is a characteristic shared by both primary and secondary consumers (Option D).
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Material
Specific Heat
(J/gºC)
Use this chart showing the different specific heat of
various materials to answer the questions.
Which material has the highest specific heat? waterv
Which material has the lowest specific heat?
Which material has the ability to absorb twice as much
heat as aluminum when placed in the same
environment of mass and temperature?
aluminum
0.90
iron
0.44
lead
0.16
sand
0.83
steel
0.49
wood
1.80
water
4.18
) Intro
Done
6 of 9
Answer:
1. C
2. A
3. B
Explanation:
I took the Assignment
The material with highest specific heat is water.
The material with lowest specific heat is lead.
The material that has the ability to absorb twice as much heat as aluminium is wood.
What is specific heat? Specific heat is the quantity of heat that are required to raise the temperature of one gram of a substance by one Celsius degree. The units of specific heat are usually calories or joules per gram per Celsius degree.To learn more about specific heat here
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stages of mitosis in order
Answer:
nucleus formed
prophase
metaphase
anaphase
telophase and cytokinesis
I don't understand this :c
help me please
Describe cycling or movement of water throughout earths spheres. Explain why the process is considered a cycle. Write a complete paragraph (five complete sentences minimum) in order to receive full credit for this activity
Answer:
This process is considered as a cycle because it continues and dosent stops. This process includes the evaporation of watet from earth surface due to heat.this water is converted in to water vapours. After reaching clouds it condences back. When the clouds become heavy with watef it falls back on earth as rain.and the process repeats.
Explanation:
5. A guava with a mass of 0.200 kg has a weight of
A. 0.200 N
B. 1.96 N
C. 4.50 N
D. 10.0 N
A guava with a mass of 0.200 kg has a weight of 1.96N
HOW TO CALCULATE WEIGHT:
The weight of an object is its mass with respect to gravity. That is, the weight of an object, which is a force measured in Newton (N) can be calculated as follows:F = mass (m) × acceleration due to gravity (a)
The mass of the guava in this question is given as 0.200kg, hence, the weight is calculated as follows:F = 0.200g × 9.8m/s²
F = 1.96N
Hence, a guava with a mass of 0.200 kg has a weight of 1.96N.
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If the mass of the reactants in the chemical reaction was 25.3 grams, what was the mass of the products
Answer:
5
Explanation:
5
How do you calculate mass and velocity does that equal to a certain amount of more energy or no
Answer:
The formula is: p=mv
(P)momentum is equal to (m) mass times (v) velocity.
Explanation:
Express 749 000 000 in scientific notation,
Answer:
7.49 × 108
Explanation:
Scientific notation is a way to express numbers in a form that makes numbers that are too small or too large more convenient to write. It is commonly used in mathematics, engineering, and science, as it can help simplify arithmetic operations. In scientific notation, numbers are written as a base, b, referred to as the significant, multiplied by 10 raised to an integer exponent, n, which is referred to as the order of magnitude:
(True/False) Solid Potassium Chloride, KCl (s), consists of equal numbers of positive Potassium ions (K+), and negative Chloride ions (Cl-) arranged in three dimensional networks called crystals. (6 Pts)
Answer:
true
Explanation:
The half-life of lead-212 is 11h. How much of a 100-g sample of lead-212 is left after 33h?
Someone please help
A car travels 45 miles per hour. What is this speed in feet per hour?
Answer:
64
hopeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
When coal is burned, sulfur is released into the air, where it reacts with oxygen to produce sulfur dioxide and sulfur trioxide. Which of the following is true of this process?
A. The identity of each reactant remains the same.
B.Sulfur dioxide and sulfur trioxide are the reactants in this change.
C.The products have different chemical properties than those of the reactants.
D. The products contain more sulfur atoms and fewer oxygen atoms than the reactants.
Answer:
c
Explanation
they have different properties now
1 pc
Calculate the volume of a an object that has a height of 14.3cm, length or
25.2cm, width of 6.7cm. *
46.2cm
2414.412 cm
0.085 cm
53.785 cm
Answer:0.085
Explanation:
Molecules in a liquid are:
closer together than in a gas
moving more quickly than in a solid
moving more slowly than in a gas
all of the above
Please help!!!
Answer:
all of the above
Explanation:
Could you do both a and b
Answer: a. atominc number= protons= 33
neutrons= mass- atominc number
80-33= 47 neutrons
b.35 protons
46 neutrons
hope this helps