Answer:
Explanation:
If observed through the year, the constellations shift gradually to the west. This is caused by Earth's orbit around our Sun. In the summer, viewers are looking in a different direction in space at night than they are during the winter.
The number of ions produced when a substance dissolves is always equal to the number of Adams in a chemical formula. What is incorrect about following statement?
In what way is heat transferred to the tubes? (Hint “touching’”)
Please help
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Answer:
in heat transfer, as the fluid flows along the tube, the wall layers are heated or cooled. temp. variation occurs in the wall layers.
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how would a map of a galaxy be different from a map of a city?
Answer:
A map of the galaxy would be a lot bigger and have a lot more names such as planets, stars, etc. While a city would be more basic than a whole galaxy.
In a chemical reaction between copper metal and silver nitrate, 12.7 g of copper(II) and 64.5 g of silver nitrate react, and 38.1 g of Silver is produced. 21) Predict the products and write the balanced equation and include the physical state of each. 22) What type of chemical reaction is this? 23) Which is the limiting reactant? You must include the work for this to receive full credit. 24) What mass of excess is used up, and what mass is left over? 25) Calculate the percent yield.
Answer:What should you do if you realize during research that your original theory is wrong
Explanation:
1. The chemical formula of caffeine is C8H10N4O2. Determine the percent composition of the molecule.
Show work please
Answer:
we find the mass for each element in one mole by multiplying the number of atoms in one molecule with the atomic mass
mC=8Ac=8*12=96g
mH=10AH=10*1=10g
mN=4AN=4*14=56g
mO=2AO=2*16=32g
by adding the masses together we find the molar mass of the molecule
M=mC+nH+mN+mO=96+10+56+32=194g/mole
we apply the rule of threes to find the percentage of each element
194g..96gC..10gH...56gN....32gO
100g....a...........b...........c.............d
a=(100*96)/194=49.48%C
b=(100*10)/194=5.19%H
c=(100*56)/194=28.85%N
d=(100*32)/194=16.48%O
Explanation:
3. You believe that water boils at 212 degrees Fahrenheit (100 degrees Celsius). Write the numberon the scale from best to worst.
1. Your cousin said that he tested the temperature of water boiling and found that it was 100°C.
2. Most people you know believe that water boils at 100°C.
3. You used a thermometer to measure the temperature at which water boiled. You repeated the experiment 3 times. Each time the thermometer read 100°C.
4. You read an article in a science journal from 50 different labs around the world that have tested the temperature of water and found that it boils at 100°C in every location.
You come across an article in a scientific journal from 50 different laboratories around the globe that measured the boiling point of water and discovered that it is 100°C everywhere.
What transpires when water is heated to 100 C (This is 212 F)?Water turns into gas around 212°F (100°C), which is the temperature at which it begins to boil (water vapor). Pressure affects the melting/freezing and boiling points. Water's boiling point changes when air pressure changes. The boiling point decreases with increasing altitude or decreasing pressure.
At 212 degrees Fahrenheit, does water boil, or at 100 degrees?Water has a freezing point of 32 degrees Fahrenheit and a boiling point of 212 degrees Fahrenheit on the Fahrenheit scale.
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The job of the ______ is to hold all of the parts of a cell together
Answer:
cell membrane
Explanation:
it holds everything together
UGRENT! Please help showing all work
Answer:
a. The limiting reactant is Ca(OH)₂
b. The theoretical yield of CaCl₂ is approximately 621.488 grams
c. The percentage yield of CaCl₂ is approximately 47.06%
Explanation:
a. The given chemical reaction is presented as follows;
Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O
Therefore;
One mole of Ca(OH)₂ reacts with two moles of HCl to produce one mole of CaCl₂ and two moles of water H₂O
The mass of HCl in an experiment, m₁ = 229.70 g
The mass of Ca(OH)₂ in an experiment, m₂ = 207.48 g
The molar mass of HCl, MM₁ = 36.458 g/mol
The molar mass of Ca(OH)₂, MM₂ =74.093 g/mol
The number of moles of HCl, present, n₁ = m₁/MM₁
∴ n₁ = m₁/MM₁ = 229.70 g/(36.458 g/mol) ≈ 6.3 moles
The number of moles of Ca(OH)₂, present, n₂ = m₂/MM₂
∴ n₂ = m₂/MM₂ = 207.48 g/(74.093 g/mol) ≈ 2.8 moles
The number of moles of Ca(OH)₂, present, n₂ = 2.8 moles
According the chemical reaction equation the number of moles of HCl the 2.8 moles of Ca(OH)₂ will react with, = 2.8 × 2 moles = 5.6 moles of HCl
Therefore, there is an excess HCl in the reaction and Ca(OH)₂ is the limiting reactant
b. According the chemical reaction equation the number of moles of CaCl₂ produced in he reaction by the 2.8 moles of Ca(OH)₂ = 2.8 × 2 moles = 5.6 moles of CaCl₂
The molar mass of CaCl₂ = 110.98 g/mol
The mass of the 5.6 moles of CaCl₂ = 5.6 moles × 110.98 g/mol ≈ 621.488 grams
The theoretical yield of CaCl₂ ≈ 621.488 grams
c. Given that the actual mass of CaCl₂ produced = 292.5 grams, we have;
The percentage yield of CaCl₂ = The actual yield/(The theoretical yield) × 100
∴ The percentage yield of CaCl₂ = (292.5 g)/(621.488 g) × 100 ≈ 47.0644646397%
The percentage yield of CaCl₂ ≈ 47.06%.
What is the difference between hurricanes,typhoons,and tropical cyclones?
the one main difference between a hurricane and a typhoon is the specific location where the storm takes place!!
typhoons and hurricanes can reach sustained winds of an averaging 74 mph.
Pls help fast, I will give brainliest!
Answer:
c
Explanation:
What happens when a chemical reaction reaches equilibrium
UGRENT! Please help showing all work
Answer:
a. Oxygen
b. 20.39g of Al₂O₃
c. 87%
Explanation:
In order to produce 2moles of Al₂O₃, we need to make react 4 moles of Al, to 3 moles of O₂.
We determine the limiting reactant with the moles of each:
12.98g / 26.98g/mol = 0.481 moles of Al
9.6g / 32g/mol = 0.300 moles of oxygen
4 moles of Al react to 3 moles of O₂
Then, 0.481 mol may react to (0.481 . 3)/4 = 0.361 moles
We only have 0.300 moles of O₂ and we need 0.361. Oxygen is the limiting reactant.
So 3 moles of O₂ can produce 2 moles of Al₂O₃
Our 0.300 moles may produce (0.300 . 2) / 3 = 0.200 mol
Our theoretical yield is: 0.2 mol . 101.96g/ mol = 20.39 g
To determine the percent yield we calculate:
(Produced yield/ Thoeretical yield) . 100 → (17.74 /20.39) . 100 = 87%
What kind of reaction is 2H202 → 2H20 + O2?
O A. Decomposition
O B. Single-replacement
C. Double-replacement
O D. Synthesis
Answer:
this reaction is so the answer should be A
How do we know if molecules have kinetic energy?
Pls help match the following
Answer:
citric acid = orange
I know the answer for this only..
Analyzing models compare an atom’s structure to a ladder. Identify one way in which ladder is not a good model from the atom.
Answer:
Climbing a ladder assumes that you would touch/use each step only once. Electrons will take one layer that is empty first, and previous layers or "steps" will continue being filled with additional electrons only when every other layer is occupied by, at least, one electron.
Explanation:
A good analogy is what passengers in a bus do. Everyone tries to sit alone first and only when every pair of seats has a person already seated, people will use them as well, sitting next to each other.
What is the name of the compound NO₄?
Answer:
hello
Explanation:
answer is oxido nitrate please follow me
why are metals poor choices for coffee mugs?
Answer:
They will stay too hot.
Explanation:
You would burn yourself on the mug and your drink would be too hot to drink.
What element is in group 4 and period 3
what is nucular decay
Answer:
Nuclear decay is also called radioactive decay, and it occurs in a series of sequential reactions until a stable nucleus is reached. Nuclear reactions release much more energy—orders of magnitude more—than exothermic chemical reactions.
Explanation:
1
What is the mass of 0.328 mol of CO2?
Answer:
use this conversation units to help you hope it helpsAm I doing this right?
What is [OH-] of a solution
with a pH of 4.0?
Answer in M
Gas in a balloon occupies 3.3 liters. What volume will it occupy if the pressure is changed from 100 kPa to 90.0 kPa, if the temperature is held constant?
Answer:
3.7 L
Explanation:
Initial volume (V₁) = 3.3 L
Initial pressure (P₁) = 100 KPa
Final pressure (P₂) = 90 KPa
Final volume (V₂) =?
The final volume of the gas can be obtained by using the Boyle's law equation as follow:
P₁V₁ = P₂V₂
100 × 3.3 = 90 × V₂
330 = 90 × V₂
Divide both side by 90
V₂ = 330 / 90
V₂ = 3.7 L
Thus, the final volume of the gas is 3.7 L
How do atmospheric updrafts affect clouds?
Answer:
Updrafts characterize a storm's early development, during which warm air rises to the level where condensation begins and precipitation starts to develop. In a mature storm, updrafts are present alongside downdrafts caused by cooling and by falling precipitation.
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Students are investigating the relationship between pressure and temperature in gases. They have blown up a balloon with carbon dioxide from an air tank and connected the balloon to a pressure gauge. The balloon is then submerged in ice or water baths at various temperatures in order to observe the pressure level after several minutes. What is the flaw in the student’s investigation, and how can the students improve their investigation to correctly determine the relationship?
A.
The volume and density of the air in the balloon can change, therefore they need to use several different balloons at different volumes to account for how density and volume affects pressure.
B.
The volume of the balloon can change, therefore they need to use several different balloons at different volumes to account for how volume affects pressure.
C.
The volume and density of the air in the balloon can change, therefore they need to use a rigid container such as plastic or metal to hold the air.
D.
To keep the volume of the balloon from changing, so they can focus on temperature and pressure they need to use a container that does not expand like a balloon. A constainer made of plastic or metal to hold the air.
Answer:
The volume and density of the air in the balloon can change, therefore they need to use a rigid container such as plastic or metal to hold the air.
Explanation:
Which of the following describes wind direction?
Wind direction is reported by the direction from which it originates. For example, a north or northerly wind blows from the north to the south. Wind direction is usually reported in cardinal (or compass) direction, or in degrees.
What are resistors? please help
Answer:Resistor Basics
Resistors are electronic components which have a specific, never-changing electrical resistance. The resistor's resistance limits the flow of electrons through a circuit.
They are passive components, meaning they only consume power (and can't generate it). Resistors are usually added to circuits where they complement active components like op-amps, microcontrollers, and other integrated circuits. Commonly resistors are used to limit current, divide voltages, and pull-up I/O lines.
Resistor units
The electrical resistance of a resistor is measured in ohms. The symbol for an ohm is the greek capital-omega: Ω. The (somewhat roundabout) definition of 1Ω is the resistance between two points where 1 volt (1V) of applied potential energy will push 1 ampere (1A) of current.
As SI units go, larger or smaller values of ohms can be matched with a prefix like kilo-, mega-, or giga-, to make large values easier to read. It's very common to see resistors in the kilohm (kΩ) and megaohm (MΩ) range (much less common to see miliohm (mΩ) resistors). For example, a 4,700Ω resistor is equivalent to a 4.7kΩ resistor, and a 5,600,000Ω resistor can be written as 5,600kΩ or (more commonly as) 5.6MΩ.
Schematic symbol
All resistors have two terminals, one connection on each end of the resistor. When modeled on a schematic, a resistor will show up as one of these two symbols:
Resistor schematic symbols
Two common resistor schematic symbols. R1 is an American-style 1kΩ resistor, and R2 is an international-style 47kΩ resistor.
The terminals of the resistor are each of the lines extending from the squiggle (or rectangle). Those are what connect to the rest of the circuit.
The resistor circuit symbols are usually enhanced with both a resistance value and a name. The value, displayed in ohms, is obviously critical for both evaluating and actually constructing the circuit. The name of the resistor is usually an R preceding a number. Each resistor in a circuit should have a unique name/number. For example, here's a few resistors in action on a 555 timer circuit:
Answer: resistor is
Explanation:
A resistor controls the flow of the electrical current within a circuit. Resistors are made from materials like copper or carbon, which make it difficult for the electrical charges to flow through a circuit. The most common type of resistor is a carbon resistor, which is a general purpose resistor, best suited for lower-powered circuits.
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Which statement is true based on the formula?
6CO2 + 6H2O —> C6H12O6
+ 6O2
1. The mass of carbon dioxide plus water is equal to the mass of sugar plus oxygen
2. The mass of carbon dioxide plus water is less than the mass of sugar plus oxygen
3. The mass of carbon dioxide plus water is greater than the mass of sugar plus oxygen
Answer:
The answer of this question is 3
2) Liquid soap is dissolve in water to make a soap solution. Why is this
solution called a mixture?
Explanation:
Soap solution is called a mixture because you're combining a ratio of liquid soap and water to make a mixture.
How many moles are in 3.0g of A1203?
Answer:
0.065 moles
Explanation: