Answer:
3. (a) more dense (b) sinks to the bottom
4. (a) less dense (b) rises above
Explanation:
To understand this, first you need to know what density is. Density is the quantity of mass per unit. If something is dense it has many molecules per unit of volume. If something is not so dense it has few molecules per unit of volume.
Cold water is close to becoming ice. In ice (solid), the molecules are compacted very tightly, therefore there are more molecules per unit of volume. This means that ice is very dense. In cold water, the molecules are close but not as close as in ice. This means that cold water is dense.
Hot water is close to becoming a water vapour. In water vapour (gas) the molecules are spaced very far apart and move around freely. They have lots of energy so they vibrate and move around a lot. There are less molecules per unit of volume in water vapour. This means that water vapour is not dense. In hot water, the molecules are not so far apart as the molecules in water vapour. This means that hot water is not so dense. But it is still considerably denser.
Salt water has two different types of molecules. The salt molecules like to cluster around the water molecules very close together. This makes salt water more dense than just plain water (freshwater).
Why can't we separate azeotropes with the distillation process?.
Answer:
have just recently learnt the theory of fractional and normal distillations and the basics of maximum and minimum boiling azeotropes.
20) When ice melts, what happens to the water molecules?
Answer:
start moving faster
Explanation:
i would guess because they slow down our freeze when they get cold
HURRY PLSS
What happens to the energy added during a phase change?
O A. It is used for the phase change.
B. It decreases the temperature.
C. It is converted to kinetic energy.
bai
D. It increases the temperature.
Answer:
A. It is used for the phase change.
Questions on Electrolysis, pls help if you can!!
Answer:
b : they move to the positive electrode
Explanation:
they lose electrons to form chlorine atoms. The atoms join up in pairs to form Cl² molecules , so chlorine gas is formed at the positive electrode
Which action is not an accomplishment of the Apollo missions?
to orbit the Earth for two weeks
to study the surface of the moon
to send rovers to the Moon
to land on the moon
Answer:
B- to study the surface of the moon
From which natural resource did John D. Rockefeller make his fortune? (1 point)
iron
O coal
O oil
O steel
Answer:
How did John D Rockefeller make his fortune? Rockefeller founded the Standard Oil Company in 1870. He ran it until 1897, and remained its largest shareholder.
Answer:
oil
Explanation:
Schools
School
Based on the graph from Experiment 1, the total number of chemicals present in the houses from the south side of town
was how much less than the houses on the west side of town?
less chemicals
Bless chemicals
52 less chemicals
D26 liess chemicals
Rain off and
Answer:
how ston age humans made hand areas
A 1.0 L balloon has a pressure of 2 atm. When the pressure increases to 400 kPa, what is the volume?
How many elements are metalloids
help
whoever answers all gets marked brainliest
#1
See H and C have shared their electrons so it's Covalent bonding#2
Yes here we can see the dots and crosses clearly.
Dot and crosses digram#3
It's Methane or CH_4
4 single bonds#4
There is no double bond
Answer:
#1
See H and C have shared their electrons so its Covalent bonding
#2
Yes, here we can see the dots and crosses clearly.
Dot and crosses diagram
#3
It's Methane or CH_4
4 single bonds
#4
There is no double bond
Explanation:
mark the person that did it before me brainliest
3. How many moles are 1.707 x 10^24 atoms of carbon?
Answer:
2.835 moles of carbon
Explanation:
By definition, there are 6.022x10^23 atoms (or compounds) in one mole.
Write and use this as a conversion factor:
(6.022x10^23 atoms)/mole
(1.707 x 10^24 atoms of carbon)/((6.022x10^23 atoms)/mole) = 2.835 moles carbon
Do you know any element which have no neutron in its atom?
Answer:
hydrogen
Explanation:
hydrogen has 1 proton, 0 neutrons and one electron
Answer:
There is only one stable atom that does not have neutrons.
Explanation:
Iron metal can be obtained from iron ore, iron (III) oxide. When the iron (III) oxide is reacted with carbon monoxide gas it forms iron metal and carbon dioxide gas. If 75.0 grams of iron (III) oxide are reacted with 50.0 g of carbon monoxide gas, what is
the theoretical yield of iron metal that can be produced?
Equation: ?
Limiting Reactant: ?
Excess: ?
Grams of target product produced:
The theoretical yield of iron metal is 42.3 g
The equation for the reaction is:
Fe₂O₃ + 3CO → 2Fe + 3CO₂
Since, all of the carbon monoxide was consumed during the reaction, then carbon monoxide is the limiting reactant
Thus, iron (III) oxide is the excess reactant
StoichiometryFrom the question, we are to determine the theoretical yield of iron metal
First, we will write the balanced chemical equation for the reaction
The balanced chemical equation for the reaction is
Fe₂O₃ + 3CO → 2Fe + 3CO₂
This means
1 mole of iron(III) oxide reacts with 3 moles of carbon monoxide to produce 2 moles of iron metal and 3 moles of carbon dioxide gas.
Now, to determine the theoretical yield of iron metal
First, we will determine the number of moles of each reactant present
For iron(III) oxideMass = 75.0 grams
Molar mass = 159.69 g/mol
Using the formula,
[tex]Number \ of \ moles = \frac{Mass}{Molar\ mass}[/tex]
Then,
Number of mole of Fe₂O₃ present = [tex]\frac{75.0}{159.69}[/tex]
Number of mole of Fe₂O₃ present = 0.46966 mole
For carbon monoxideMass = 50.0 g
Molar mass = 44.01 g
Then,
Number of moles of CO₂ present = [tex]\frac{50.0}{44.01}[/tex]
Number of moles of CO₂ present = 1.136105 moles
Now,
If 1 mole of iron(III) oxide reacts with 3 moles of carbon monoxide to produce 2 moles of iron metal
Then,
0.378702 mole of iron(III) oxide will react with 1.136105 moles of carbon monoxide to produce 0.757403 moles of iron metal
Therefore, the number of moles of iron metal that would be produced is 0.757403 moles
Now, for the mass of the iron metal
Using the formula
Mass = Number of moles × Molar mass
Atomic mass of iron metal = 55.845 g/mol
Then,
Mass of iron metal that would be produced = 0.757403 × 55.845
Mass of iron metal that would be produced = 42.29717 g
Mass of iron metal that would be produced ≅ 42.3 g
Hence, the theoretical yield of iron metal is 42.3 g
The equation for the reaction is:
Fe₂O₃ + 3CO → 2Fe + 3CO₂
Since, all of the carbon monoxide was consumed during the reaction, then carbon monoxide is the limiting reactant
Thus, iron (III) oxide is the excess reactant
Learn more on Stoichiometry here: https://brainly.com/question/6061451
How many h+ ions are present in 65. 5 mL of 0. 722 M sulfuric acid
Answer:
are there answer options
Explanation:
what happens when magnesium is burnt in air?
It forms magnesium oxide by reacting with oxygen
The balanced equation is provided by
[tex]\\ \rm\hookrightarrow 2Mg+O_2=2MgO[/tex]
On both sides
Mg=2O=2Hence balanced
why do fresh egg sink and rotten egg float
Answer:
As the egg ages, air enters the egg and the air cell becomes larger and this acts as a buoyancy aid. Generally, fresh eggs will lie on the bottom of the bowl of water.
Eggs that tilt so that the large end is up are older, and eggs that float are rotten.
Explanation:
hope it helps
Determine the moles if given 20.3g of beryllium
Answer:
5.075moles
Explanation:
First get the molecular mass of beryllium which is 4g/mol.
Then input your given mass...
Formular for mole =mass/molecular mass
Mole=20.3g/4g/mol
=5.075moles
What magma would have formed from the partial melting of mantle material?.
Answer:
Basaltic magma is formed through dry partial melting of the mantle. The mantle lies just below the crust of the earth. Basalts make up most of the ocean’s crust; this is why basaltic magma is typically found in oceanic volcanoes. See also what substances are emitted from fumaroles? What type of melting produces most basaltic magmas?
Explanation:
please add me as brainliest..
Which property makes the materials used in fiber optic cables so useful?
A) high density
B) the ability to conduct heat
C) the ability to reflect electromagnetic waves
D) malleability
Answer:
nosé inglés y no se está pregunta
primary needs in South Africa and secondary needs and wants in South Africa
Answer:
Food, safe water, housing, education, and health care are examples of basic needs. Wants are desires that can be satisfied by goods and services.Secondary needs are the desires and wants that become important when primary needs are satisfied. Definition (2): Secondary needs are connected with the desire for satisfaction and pleasure of the human being: designer articles or furniture, the high-tech and the newest cell phone, jewelry, a luxury car, etc.
お役に立てば幸いです
Need help with balancing equations!
Answer:
Fe2O3 + 3CO → 2Fe + 3CO2
Explanation:
the numbers in front are the numbers you need
[tex]\qquad \qquad\huge \underline{\boxed{\sf Answer}}[/tex]
Here's the balanced chemical equation for given reaction ~
[tex] \sf Fe_2O_3 (s) +3 \: CO (g) =2 \: Fe(l) + 3\: CO_2 (g)[/tex]
As we can see, the Coefficient of Fe (l) is 2
Based on the traits, which traits were most prevalent in the class? Did you have more traits aligned with the dominant traits or more that were rare? If you have a rare trait, which do you have?
Answer:
Image result for Based on the traits, which traits were most prevalent in the class? Did you have more traits aligned with the dominant traits or more that were rare? If you have a rare trait, which do you have?
The Big Five personality traits are extraversion (also often spelled extroversion), agreeableness, openness, conscientiousness, and neuroticism. Each trait represents a continuum. Individuals can fall anywhere on the continuum for each trait. The Big Five remain relatively stable throughout most of one's lifetime.
Explanation:
Which is a process that converts sunlight energy into a compound that stores chemical energy?.
Answer:
Photosynthesis
Explanation:
If thats one of the options, thats the answer. Let me know if its not, and I'll be glad to help :)
Answer:
photosynthesis is the answer
Explanation:
because organisms convert light energy into chemical energy which can be stored in molecular bonds
Calculate the molarity of 1 mole of NaNO3 in 500 mL of water
Answer:
2.00 mol/L or 2.00 M
Explanation:
500 mL ( 1 L / 1,000 mL) = 0.500 L
M = 1 mole NaNO3 / 0.500 L = 2.00 mol/L or 2.00 M
Hope this Helps!!!!
The percentage yield of a reaction compares the actual yield with the __________ yield. What completes the sentence?
Calculate the pH of a solution made by adding 2. 60 g of lithium oxide (Li2O) to enough water to make 1. 700 L of solution
To solve this problem, let's write out the equation of reaction
[tex]Li_2O + H_2O \to 2LiOH[/tex]
pH of a SolutionThe pH of a solution indicates it's level of acidity. But in this question, lithium oxide dissolves in water to produce lithium hydroxide.
We can calculate the acidity of the solution by;
The numbers of moles is
[tex]n = \frac{mass}{molar mass}\\n = \frac{2.6}{30}\\n = 0.086 moles[/tex]
1 mole of Li2O produce 2 moles LiOH
0.086 moles of H2O will give
[tex]2 * 0.086 moles = 0.173 moles of LiOH[/tex]
The molarity of LiOH
[tex]n = \frac{moles}{volume} = \frac{0.173}{1.70} = 0.102M[/tex]
Since we have the pOH of the solution, let's calculate the pH of the solution
[tex]pH + pOH = 14\\pH = 14 - pOH\\pOH = 0.99\\pH = 14 - 0.99 = 13.009[/tex]
The pH of the solution is equal to 13.0
Learn more on pH of a solution here;
https://brainly.com/question/13557815
If a compound formula mass was experimentally determined to be 17 AMU the chemical formula would be
The chemical formula of a compound with a formula mass of 17 will be NH3
Formula massThe formula mass of a compound or molecule is derived by summing the average molar weight of the individual atoms that make up the compound or molecule.
In this case, the formula mass is 17.
For ammonia with chemical formula NH3;
Molar weight of H = 1
Molar weight of N = 14
Formula mass = (14) + (1 x 3)
= 17 AMU
More on formula mass can be found here: https://brainly.com/question/867780
Answer: NH3
Explanation:
Christopher conducts an experiment in which he tests how much sugar dissolves at different temperatures of water. One step requires him to use water with a temperature of 32.5°C. What is this temperature in kelvins? Record your answer to the nearest tenth.
Answer:
305.65 K
Explanation:
Celsius to Kelvin => + 273.15
32.5 + 273.15
= 305.65 K
Answer:
The answer is:
305.5K
Explanation:
I did the assignment on Edge, 2022.
(See the attachment below.)
Hope this helped, good luck on the Quiz! <3
What kind of animal is more likely to have taste buds for umami flavors, a carnivore or an herbivore? Explain.
How many moles of carbon dioxide gas occupy a volume of 81. 3.
Answer:
239
Explanation:
i think this is the answer