Please help me, Thank you!
Answer:
5
Explanation:
The electrons in the outermost shell are the valence electrons. Since there are 5 electrons in the third energy level, there are 5 valence electrons.
Hope that helps.
3. A 240 mL sample of argon gas at 270 K is cooled until the volume is 180 mL. What is the new temperature?
Answer:
202.5 K
Explanation:
aluminum bromide reacts with chlorine gas to produce aluminum chloride and bromide gas. if we have 9 moles of chlorine gas. how many moles of chlorine can we produce?
Moles of Bromine produced = 9 moles
Further explanationGiven
9 moles of Chlorine gas
Word equation
Required
Moles of Chlorine produced
Solution
We change the word equation into a chemical equation (with a formula)
Aluminum bromide reacts with chlorine gas to produce Aluminum chloride and bromide gas
2AlBr₃+3Cl₂⇒2AlCl₃+3Br₂
moles Cl₂ = 9
Maybe you mean, how many moles of Bromine can we produce?
From equation, mol ratio Cl₂ : Br₂ = 3 : 3, so mol Br₂=mol Cl₂=9 moles
If 0.621miles = 1 km, how many miles will a person run during a 15 km race?
1 2 3 4 5 6 7 8 9 10 Suna passes an electric current through a sample of clear, colorless, and odorless liquid. As the experiment continues, bubbles form, and the volume of liquid decreases. Suna collects samples of two colorless, odorless gases that bubble out of the liquid. One of the gases burns. Neither the original liquid nor the other gas burns. Which is the best explanation of her results
The question is incomplete, the complete question is;
Suna passes an electric current through a sample of clear, colorless, and odorless liquid. As the experiment continues, bubbles form, and the volume of liquid decreases. Suna collects samples of two colorless, odorless gases that bubble out of the liquid. One of the gases burns. Neither the original liquid nor the other gas burns. Which is the best explanation of her results? The electric current changed some of the sample to gas even though the sample was not breaking down. Therefore, the original liquid is a compound. The electric current released a gas that was odorless and colorless, like the original sample. Therefore, the original liquid is an element. The sample was broken down by the electric current and formed a new substance that could burn. Therefore, the original liquid is a compound. The sample lost some of its volume, but the gas still had the same chemical makeup as the original sample. Therefore, the original liquid is an element.
Answer:
The sample was broken down by the electric current and formed a new substance that could burn. Therefore, the original liquid is a compound.
Explanation:
When electric current is passed through a compound, the compound may become broken down to release its constituents. We refer to this phenomenon as electrolysis. We can now say that the substance has been 'decomposed' electrolytically.
Since the original sample was decomposed to yield a gas that could burn and one that couldn't burn even though the original sample couldn't burn, then the original sample is a compound.
What three consumers live in the epipelagic zone?
Please Help! Thank You
Answer:
61.5 dry quarts = 67.72509L
Explanation:
What does the slope of a distance versus time graph represent?
Total time
Average time
Average distance
Speed
Answer:
Speed
Explanation:
Motion can be represented by a distance-time graph, which plots distance on the y-axis and time on the x-axis. The slope of a distance-time graph represents speed. The steeper the slope is, the faster the speed.
Hope this helps!:)
Hi does anyone have the data table answers for the Charles Law Lab Report from Edge?
Answer:
Last Column is:
Explanation:
98 , 7.8 , 371 and 0.98
What is the oxidation state of the copper in the compund of CuCl²
Answer:
The oxidation number of metallic copper is zero. In its compounds, the most common oxidation number of Cu is +2. Less common is +1. Copper can also have oxidation numbers of +3 and +4
Explanation:
Dry ice changes from a solid to a gas in a process known as A. Melting B. Freezing C.sublimation
Answer:
c
Explanation:
solid to gas directly
Which has a greater ionization energy: lithium or bromine? Which has a greater ionization energy: vanadium or sodium?
Hydrogen and oxygen are examples of which of these?
elements
compounds
none of the above
molecules
I need to know astroides
What does percent composition tell you about a substance?
O
A. It gives you the molecular formula of the substance,
B. It tells you what the substance is made of
O C. It gives you the total mass of the substance,
OD. It tells you how many moles are in the substance,
Answer:
Percent composition tells you which types of atoms (elements) are present in a molecule and their levels. Percent composition can also tell you about the different elements present in an ionic compound as well.ion:
Answer:
Explanation:hey
15
Select the correct boxes.
Which two elements have the same number of valence electrons?
Element
Atomic Number
barium
56
neon
10
silicon
14
carbon
6
Reset
Reset
Next
Answer:
barium and silicon has same valence electrons
Explanation:
barium-2,8,18,18,8,2
neon-2,8
silicon-2,8,2,2
carbon-2,4
Answer: both barium and silicone
Explanation:
it was an my exam
A sample of carbon dioxide gas at a pressure of 1.10 atm and a temperature of 20.6 C, occupies a volume of 19.2 L. If the gas is allowed to expand at a constant temperature to a volume of 24.3 L, the pressure of the gas sample will be ____ atm.
Answer:
P₂ = 0.87 atm
Explanation:
Given data:
Initial pressure = 1.10 atm
Initial volume = 19.2 L
Final volume = 24.3 L
Final pressure = ?
Solution:
The given problem will be solved through the Boyle's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
1.10 atm × 19.2 L = P₂ × 24.3 L
P₂ = 21.12 atm. L/ 24.3 L
P₂ = 0.87 atm
How are electrons added to orbitals in an electron configuration?
Answer:
Electrons are added to atomic orbitals in order from low energy bottom of the graph to high (top of the graph according to the Aufbau principle. Principle energy levels are color coded, while sublevels are grouped together and each circle represents an orbital capable of holding two electrons
Explanation:
how is mathematics utilized in performing science
Answer:
Mathematics is used in Physical Science to calculate the measurements of objects and their characteristics, as well as to show the relationship between different functions and properties. Arithmetic, algebra and advanced mathematics may be used.
Explanation:
If an 85.0 mL container of helium gas at standard pressure is heated from 20.oC to 91oC and the pressure is increased to 2.8 atm, then what would the new volume be for the He gas
Answer: V₂ = 37.71mL
Explanation: To determine the new volume of Helium gas, use the Combined Gas Law, which states the following relationship among pressure, volume and temperature:
[tex]\frac{P_{1}V_{1}}{T_{1}} =\frac{P_{2}V_{2}}{T_{2}}[/tex]
where index 1 relates to the initial state of the gas and index 2 to the final state of the gas.
Temperature is in Kelvin, so:
T = °C + 273
For this situation, standard pressure is 1 atm. Temperatures will be:
T₁ = 20 + 273 = 293 K
T₂ = 91 + 273 = 364 K
Solving:
[tex]V_{2}=\frac{T_{2}P_{1}V_{1}}{P_{2}T_{1}}[/tex]
[tex]V_{2}=\frac{364*1*85}{2.8*293}[/tex]
[tex]V_{2}=\frac{30940}{820.4}[/tex]
[tex]V_{2}=[/tex] 37.71
The new volume of He gas is 37.71 mL.
Specific gravity compares the density of a substance to the density of _____.
PLEASE HELP ILL GIVE YOU 15 POINTS !!!!!!
Answer:
Specific gravity compares the density of a substance to the density of air.
Specific gravity is compared the density of a substance to the density of water.
What is specific gravity?Specific Gravity is a dimensionless quantity that can be defined as the ratio of the density of a substance to the density of the water at a particular temperature.
The mathematical formula of the specific gravity can be written as:
Specific gravity = density of substance / density of water
The density of water at 4°C is used as a reference point as water has the highest density of 1000 kg/m³. Specific gravity or relative gravity does not have any dimension as it is a dimensionless quantity.
Specific gravity is the ratio of a substance’s density to that of water at a specific temperature. The temperature plays an important role in determining the specific gravity of a substance.
Therefore, specific gravity is a characteristic of the substance at a particular temperature and pressure that also affects the specific gravity.
Learn more about Specific gravity, here:
https://brainly.com/question/9100428
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Formula of a copper (II)sulfate hydrate lab
Mass of empty dish: 50.58 g
mass of crystals and dish: 55.63
mass of crystals after first heating: 54.57
mass of crystals after second heating: 53.83
mass of crystals after 3rd heating: 53.74
then it asks for the mass of crystals in the evaporating dish. i said 50.58/55.63x100= 90.94(i’ve yet to round to significant figures) and i’m unsure as to whether or not this is the proper equation?? i get more questions on the crystals for the heating, and then it goes to ask: determine the mass of water evaporated from ye crystals during the heating. If you know what equation to use, please let me know!!
the other questions: using the mass of water evaporated from the crystals after the 3rd heating, determine the percentage by mass of water in the copper (II) sulfate hydrate crystals.
Based on the following formulae fir copper determine the GFM of the hydrate crystals: CuSO4 x 5H2O
then more like that but this ones for the accepted percentage by mass of water in the hydrate crystals: CuSO4x5H2O.
then determine percent error.
Answer:
Weigh the empty crucible, and then weigh into it between 2 g and 3 g of hydrated copper(II) sulphate. Record all weighings accurate to the nearest 0.01 g.
Support the crucible securely in the pipe-clay triangle on the tripod over the Bunsen burner.
Heat the crucible and contents, gently at first, over a medium Bunsen flame, so that the water of crystallisation is driven off steadily. The blue colour of the hydrated compound should gradually fade to the greyish-white of anhydrous copper(II) sulfate. Avoid over-heating, which may cause further decomposition, and stop heating immediately if the colour starts to blacken. If over-heated, toxic or corrosive fumes may be evolved. A total heating time of about 10 minutes should be enough.
Allow the crucible and contents to cool. The tongs may be used to move the hot crucible from the hot pipe-clay triangle onto the heat resistant mat where it should cool more rapidly.
Re-weigh the crucible and contents once cold.
Calculation:
Calculate the molar masses of H2O and CuSO4 (Relative atomic masses: H=1, O=16, S=32, Cu=64)
Calculate the mass of water driven off, and the mass of anhydrous copper(II) sulfate formed in your experiment
Calculate the number of moles of anhydrous copper(II) sulfate formed
Calculate the number of moles of water driven off
Calculate how many moles of water would have been driven off if 1 mole of anhydrous copper(II) sulfate had been formed
Write down the formula for hydrated copper(II) sulfate.
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Explanation:
The diagram shows the movement of magma due to
convection currents.
Based on the diagram, which
part of Earth is the
coolest?
A) the crust
Crust
B) the mantle
the outer core
Mantle
C) Outer core
D) the inner core
Inner core
Answer:
A) The crust
hope this helps :)
Explanation:
Answer:
The coolest part in the diagram shown is A.) The Crust
Explanation:
This is because as more and more layers form, they soon harden because they are further away from the heat force, which would be the core.
Hope this helps. Sorry if I am wrong. ;-;
What is the molarity of a solution
made by dissolving 18.9 g of
ammonium nitrate (NH4NO3) in
enough water to make 855 mL of
solution?
Molar Mass N: 14.01 g/mol
Molar Mass H: 1.008 g/mol
Molar Mass O: 16.00 g/mol
Answer:
Molarity = 0.28 M
Explanation:
Given data:
Mass of NH₄NO₃ = 18.9 g
Volume of solution = 855 mL (855mL × 1 L/1000 mL = 0.855 L)
Molarity of solution = ?
Solution:
Number of moles of NH₄NO₃:
Number of moles = mass/molar mass
Number of moles = 18.9 g/ 80.043 g/mol
Number of moles = 0.24 mol
Molarity:
Molarity = number of moles of solute / volume in L
Molarity = 0.24 mol /0.855 L
Molarity = 0.28 M
Answer:
0.28
Explanation:
:D
According to kinetic theory, all matter is made up of small particles. The particles are constantly
moving
Diagram 1 shows how the particles may be arranged in a solid.
Diagram 1
(a)
One kilogram of a gas has a much larger volume than one kilogram of a solid
Use kinetic theory to explain why.
Enter your answer
Answer:
Explanation:
(a) there are strong forces (of attraction) between the particles in a solid
accept molecules / atoms for particles throughout
accept bonds for forces
1
(holding) the particles close together
particles in a solid are less spread out is insufficient
1
or
(holding) the particles in a fixed pattern / positions
but in a gas the forces between the particles are negligible
accept very small / zero for negligible
accept bonds for forces
1
so the particles spread out (to fill their container)
accept particles are not close together
gas particles are not in a fixed position is insufficient
One kilogram of a gas has a much larger volume than one kilogram of a solid. In kinetic theory particles in a solid are less spread out but in gas the force between the particles are negligible.
What is Kinetic Theory of matter ?The kinetic theory of matter states that all matter is made up of tiny particles which are constantly moving in a state of motion. All particles should posses energy.
Thus from above conclusion we can say that One kilogram of a gas has a much larger volume than one kilogram of a solid. In kinetic theory particles in a solid are less spread out but in gas the force between the particles are negligible.
Learn more about the Kinetic theory of matter here: https://brainly.com/question/1948317
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What is the attraction between all objects to have matter
Answer:
Gravity.
Explanation:
In science, matter can be defined as anything that has mass and occupies space. Any physical object that is found on earth is typically composed of matter. Matter are known to be made up of atoms and as a result has the property of existing in states.
Generally, matter exists in three (3) distinct or classical phases and these are;
1. Solid: it is the state of matter in which the physical substance has a definite shape and fixed volume but not compressible. Examples of solids are pen, screwdriver, television, car etc.
2. Liquid: it is the state of matter in which the physical substance can be poured and it takes the shape of its container. Also, liquids generally have a definite volume. Examples of liquids are urine, water, milk, blood etc.
3. Gas: it is the state of matter in which the physical substance has no definite shape or volume and as a result fills all available space. Also, gases are easily compressible and can flow. Examples of gases are hydrogen, oxygen, argon, nitrogen etc.
The attraction between all objects that have matter is generally referred to as gravity.
Generally, this force of attraction (gravity) attracts an object (body) towards another having mass, or towards the center of a planetary body such as earth.
Which condition must exist in order for conduction to occur between two substances?
ОО
A ) The molecules of the substances must be touching.
B) Both substances must be the same temperature.
C) At least one substance must be a liquid
D) Most of the molecules must be slow moving.
Answer: B
Explanation:
Answer:
B. Both substances must be the same temperature.
Explanation:
Megan let her wagon outside what was raining and filled with water. When Megan tried to move the wagon that afternoon, she failed to budge the wagon. Why did Megan's wagon become hard to move?
Answer:
The rain filled the wagon with water meaning it gave the wagon more weight which made it hard to move.
Hydrochloric acid (HCl) and sodium hydroxide (NaOH) react to form water and sodium chloride (NaCl). If you have 2.87 g of HCl, 3.75 g of water, and 1.98 g of NaCl, how many grams of NaOH were reacted? Your answer should go to the hundredths place.
Answer:
2.86g
Explanation:
Mass of HCl = 2.87g
Mass of water = 3.75g
Mass of NaCl = 1.98g
Unknown:
Mass of NaOH reacted = ?
Solution:
The reaction expression is given as:
HCl + NaOH → NaCl + H₂O
According to the law of conservation of mass, the mass of reactants and products must be the same.
Mass of HCl + Mass of NaOH = Mass of NaCl + Mass of H₂O
2.87g + Mass of NaOH = 1.98g + 3.75g
Mass of NaOH = 1.98g + 3.75g - 2.87g = 2.86g
Which of the following elements is the least electronegative?
A. NA
B. Al
C. Cl
D. Si
Answer:
na
Explanation:
gggggggggggggggggggggggggg
Cl (chlorine) ion is negatively charged.
Need help in these 2 questions
Answer:
1 = 7.5m/s and 2 = 8m/s
Explanation:
For question no. 1
Given
wavelength = 5 m
Frequency = 1.5 Hz
Velocity =?
We have the formula that
Velocity = wavelength * frequency
= 5 * 1.5
= 7.5 m/s
For question no. 2
Frequency = 2 Hz
Wavelength = 4 m
Velocity = ?
We have the formula that
Velocity = wavelength * frequency
= 4* 2
= 8 m/s
Hope it will help :)
Answer:
1. 7.5m/s
2. 8m/s
Explanation: velocity = Wavelength x Frequency so 5m*1.5Hz=7.5m/s and 2Hz*4m=8m/s
