Answer:
I put B&C
Explanation:
How does Bohr’s model of the atom compare with Thomson’s model?
They both describe atoms as small, indivisible spheres.
They both describe electrons as moving around the nucleus.
They both describe electrons as being surrounded by the positive matter.
They both describe atoms as being made up of positive and negative matter.
Answer: They both describe atoms as being made up of positive and negative matter.
Answer:
They both describe atoms as being made up of positive and negative matter.
Explanation:
I did it on edge
When sodium atoms (Na) and chlorine atoms (CT) join to make sodium chloride, or table salt, they form an ionic bond, Using this information, which pair of elements is most likely to form an ionic bond? O potassium (K) and fluorine (F) aluminum (AI) and aluminum (AD O sulfur (S) and oxygen (O) O calcium (Ca) and neon (Ne)
Answer:
D I'm pretty sure.
Explanation:
I'm taking the quiz right now and D makes the most sense.
Answer:
d
Explanation:
A 10.0-liter flask contains 1.013 grams of oxygen and .572 grams of carbon dioxide at 180C. What are the partial pressures of oxygen and carbon dioxide? What is the total pressure? What is the mole fraction of oxygen in the mixture?
P tot = 0.1065 atm
The mole fraction of oxygen in the mixture : 0.709
Further explanationGiven
10 L flask
1.013 g O₂
572 g CO₂
T = 18 °C = 291 K
Required
P O₂ and P CO₂
Solution
Dalton Law's of partila pressure
P tot = P₁ + P₂ + ..Pₙ
From ideal gas Law :
[tex]\tt P_{O_2}=\dfrac{\dfrac{1.013}{32}\times 0.082\times 291 }{10}\\\\P_{O_2}=0.0755~atm[/tex]
[tex]\tt P_{CO_2}=\dfrac{\dfrac{0.572}{44}\times 0.082\times 291}{10}\\\\P_{CO_2}=0.031~atm[/tex]
P tot = P O₂ + P CO₂
P tot = 0.0755 + 0.031
P tot = 0.1065 atm
The mole fraction of O₂ :
[tex]\tt P_{O_2}=X_{O_2}\times P_{tot}\\\\X_{O_2}=\dfrac{P_{O_2}}{P_{tot}}\\\\X_{O_2}=\dfrac{0.0755~atm}{0.1065~atm}\\\\X_{O_2}=0.709[/tex]
what is the balanced chemical equation for sulphuric acid and zincoxide
Answer:
ZnO + H2SO4 = ZnSO4 + H2O | Chemical reaction and equation
Explanation:
gloogle
what are all the populations of different species that live in the same area at the same time
Answer:
The answer is Community
Explanation:
Someone help me answer this please! I’ll mark you brainliest
b. increase in surface area
Further explanationGiven
Speeding up a chemical reaction
Required
Factors used to speed up reactions
Solution
There are several factors that influence reaction kinetics :
1. Concentration
2. Surface area
3. Temperature
4. Catalyst
5. Pressure
6. Stirring
Temperature is related to the kinetic energy of the particles. Heat is absorbed causes the particles of matter to move faster so that the reaction can take place faster
The enlarged surface area of the reactants causes more particles to react with other particles.
50 g square block of sulfur can be broken into small pieces or powdered so that more particles come into contact with each other
Which of the following equations represents the balanced equation for the reaction of iron and oxygen?
a)
4Fe + 3O2 → 2Fe2O3
b)
2Fe + O2 → Fe2O3
c)
3Fe + 3O2 → 2Fe2O3
d)
Fe + 3O2 → Fe2O3
Answer:
D is balanced. :)
Among the following equations the one that represents the balanced equation for the reaction of iron and oxygen is a.
4Fe + 3O₂ → 2Fe₂O₃
What is balancing of a reaction?Balancing of a reaction is done according to the "Law of conservation of mass" and balancing helps in solving stoichiometry questions correctly as if we will not balance the reaction then the quantitative results in a particular question doesn't come correctly.
Balancing of a reaction helps in mole concept as well and it is one of the laws of chemical reactions as well.
Some examples of balanced chemical reactions are-
2Mg(s) + O₂(g) ⟶ 2MgO(g)
Ca(OH)₂ + H₃PO₄ → Ca₃(PO₄)₂ + H₂O
Therefore, Among the following equations the one that represents the balanced equation for the reaction of iron and oxygen is a.
4Fe + 3O₂ → 2Fe₂O₃
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If you find a chemical in the lab and are unsure of
its identity, what is the best way to find out what it
is?
Answer:
C. read the label on the container
Explanation:
What information is found in an SDS? Check all that apply.
A. the identification of the chemical
C. the chemical and physical properties of the substance
D. the first-aid measures to take if an accident occurs involving the chemical
Answer:
C
Explanation:
just did it
Which image best represents a solution of distilled water at pH = 7? A cylinder contains many pale blue balls and 3 purple balls. A box has a pale blue ball with the label H + and a purple ball with the label O H negative. A cylinder contains about equal numbers of pale blue balls and purple balls. A box has a pale blue ball with the label H + and a purple ball with the label O H negative. A cylinder contains 3 pale blue balls and many purple balls. A box has a pale blue ball with the label H + and a purple ball with the label O H negative.
Answer:
The answer would be B
Explanation:
got it right on edge2021
A pH of 7 indicates neutrality of the solution. A solution will be neutral when it contains equal number of H+ and OH- ions. Thus, the cylinder with containing equal number of purple and pale blue balls represents the solution with pH of 7.
What is pH?pH of a solution is the measure of its H+ ions concentration. Mathematically it is the negative logarithm of H+ ion concentration. pH of the solution determines the acidity or basicity of the solution.
A solution with pH of 7 is neutral. Thus having no acidity or basicity. The acid-base reaction neutralize each other forming their salt with pH of 7 and it is called neutralization reaction.
The solution with a pH below 7 is acidic and the solutions with pH above 7 are basic solutions. Bases are proton acceptors and they furnish OH- ions when ionized.
The solution with equal number of H + and OH- ions neutralize each other and thus have a pH of 7. Therefore, the cylinder with equal number of blue and purple balls represents the neutral water.
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Given the following two quantities: 0.50 mol of CH4 and 1.0 mol of HCl,
a. Which has more atoms?
b. Which has more molecules?
c. Which has the greater mass?
d. Which has the greater volume at the same temperature and pressure (both are gases)?
Answer:
(a) HCl
(b) HCl
(c) HCl
(d) HCl
Explanation:
Given: 0.50 mol of CH₄ and 1.0 mol of HCl
Using stoichiometry we can calculate the answers to parts a, b, c, and d.
Part (a)# of moles × Avogadro's number = # of atoms or molecules
Avogadro's number: 6.02 * 10²³
[tex]\displaystyle 0.50\ \text{mol CH}_4 \cdot \frac{6.02\cdot 10^2^3 \ \text{atoms CH}_4}{1 \ \text{mol CH}_4} = 3.01 \cdot 10^2^3 \ \text{atoms CH}_4[/tex] [tex]\displaystyle 1.0\ \text{mol HCl} \cdot \frac{6.02\cdot 10^2^3 \ \text{atoms HCl}}{1 \ \text{mol HCl}} = 6.02 \cdot 10^2^3 \ \text{atoms HCl}[/tex]HCl has more atoms than CH₄.
Part (b)This is calculated the same way as Part (a); HCl has more molecules than CH₄.
Part (c)Molar mass of CH₄ = 16.04 g/mol
Molar mass of HCl = 36.458 g/mol
[tex]\displaystyle 0.50\ \text{mol CH}_4 \cdot \frac{16.04 \ \text{g CH}_4}{1 \ \text{mol CH}_4} = 8.02 \ \text{g CH}_4[/tex] [tex]\displaystyle 1.0\ \text{mol HCl} \cdot \frac{36.458 \ \text{g HCl}}{1 \ \text{mol HCl}} = 36.458 \ \text{g HCl}[/tex]HCl has a greater mass than CH₄.
Part (d)Assuming STP:
Molar volume of any gas at STP is 22.4 L/mol.
[tex]\displaystyle 0.50\ \text{mol CH}_4 \cdot \frac{22.4 \ \text{L CH}_4}{1 \ \text{mol CH}_4} = 11.2 \ \text{L CH}_4[/tex] [tex]\displaystyle 1.0\ \text{mol HCl} \cdot \frac{22.4 \ \text{L HCl}}{1 \ \text{mol HCl}} = 22.4 \ \text{L HCl}[/tex]HCl has a greater volume than CH₄.
2. As an airplane moves forward, the shape of its wings causes a difference in pressure
below and above the wings. What is the effect of this difference in pressure?
A a downward force la created
B. the airplane speeds up
C. an upward force la oreated
D. the airplane slowa down
Answer:
C. An upward force is created
Explanation:
As an airplane moves forward, the shape of its wing creates lower pressure above the wing than below, yielding a net upward force known as lift.
Hope this helps!
A science teacher gave a student a sample of a clear liquid labeled "unknown
substance." Which property would best help the student determine the
sample's identity?
A. The sample's boiling point
B. The sample's mass
C. The sample's volume
D. The sample's weight
Answer:
A. The sample's boiling point
Explanation:
Because by knowing boiling point we easily find a substance for example if given clear liquid boiling point is 100 c° we immediately know this is water.
Moreover boiling point is a fixed quantity for a substance.
Compare and contrast The two methods of making alcohol
Answer:
The table compares making ethanol by hydration of ethene (ethene and steam) to making ethanol by fermentation (sugar from plant material).
The Princess cruise ship left San Francisco and traveled south for 8 hours at a speed of 30mph. What is the velocity of the ship? Round your answer to the hundreths place
Answer:
v = 300 mph due South.
Explanation:
Given that,
The Princess cruise ship left San Francisco and traveled south for 8 hours at a speed of 30mph.
We need to find the velocity of the ship. It can be calculated by total distance divided by total time taken.
Velocity is a vector quantity i.e. it has both magnitude and direction. On the other hand, the speed has only magnitude (scalar quantity).
In this case it is mentioned that the cruise is travelling south with a speed of 300 mph.
Hence, the velocity is 300 mph in South direction.
A common organic compound is analyzed and found to contain 40.00% carbon, 6.71%, and 53.29%. Determine the empirical formula
A)
CH2O
B)
C₂H₂O₃
C)
C6HO8
D)
C6H12O6
Answer: CH2O I just did the question
Explanation:
Empirical formula is the simplest whole number ration of elements in a compound. Molecular formula is n times where n is integers 1,2,... Therefore, the empirical formula that is 40.00% carbon, 6.71% hydrogen, and 53.29% oxygen is CH[tex]_2[/tex]O.
What is empirical formula?Empirical formula gives the proportion of the element that is present in a compound. It does not give information about the actual number or the arrangements of the atoms.
Number of gram atoms in compound = percentage of that element ÷Molar mass of that element
Molar mass of carbon=12
Molar mass of hydrogen =1
molar mass of oxygen=16
C= 40.00%÷24=1.66
H= 6.71%÷1=6.71
O=53.29%÷/16=3.33
The atomic ratio is1.66:6.71:3.33. Dividing by smallest whole number, the Whole number ratio is C:H:O is 1:2:1. Empirical formula corresponding to this whole number is CH[tex]_2[/tex]O.
Therefore, the empirical formula that is 40.00% carbon, 6.71% hydrogen, and 53.29% oxygen is CH[tex]_2[/tex]O.
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explain how transferring energy into or out of a substance changes the molecules kinetic energy and changes their freedom of movement
Answer:
Transferring energy into or out of a substance changes its temperature, which changes the molecules' freedom of movement. Claim 2: Transferring energy into or out of a substance changes the molecules' kinetic energy, which changes their freedom of movement.
what does newton’s first law of motion explain
Answer:
Newton's first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
What is the conversion for 2.0 m + 3.33 m + 4 m =
Answer:
933/100
9.33m
....... . . . . .. .. .
The photo shows wires made of pure copper, an element
What would the smallest piece of copper be?
A. Copper atom
B. Mixture of different kinds of metallic elements
C. Copper molecule
D. Compound containing two or more elements
Answer:
B
Explanation:
I hope its right. I'm pretty sure.
Answer:
Explanation:
Copper Atom
The Venn diagram describes a phase change from solid to gas phase between the areas marked
A. B and C
B. A and C
C. A and B
D. None of these
The only way to see the far side of the moon is
Answer:
Only one side of the spherical Moon is ever visible from Earth it wasn't until 1959 when the Soviet Spacecraft Luna 3 orbited the Moon and sent pictures home that human beings were able to see the "far side" of the Moon for the first time. A phenomenon called tidal locking is responsible for the consistent view
Answer this please if you do i will give you brainilset if you get it correct
Answer:
D
Explanation:
HELP HELP HELP HELP HELP HELP HELP
What's wrong with the statement "a mug of hot chocolate contains more heat than a glass of cold water."
Answer:
Heat is not something that can be contained since it is not a tangible thing. Heat is a process
Explanation:
The wrong thing in this statement "a mug of hot chocolate contains more heat than a glass of cold water."is: Heat is a process. Heat is not something that can be contained since it is not a tangible thing.
What is Heat ?Heat can be defined as a state or quality of being hot or in a high temperature.
Heat can also be said to be a transfer of kinetic energy from one environment to another, from one medium to another, or from one object to another.
In conclusion, Heat is a process. Heat is not something that can be contained since it is not a tangible thing.
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What property of water makes it a good choice to use to cool down hot
material quickly ?
Answer:
Because of its high heat capacity, water can minimize changes in temperature. For instance, the specific heat capacity of water is about five times greater than that of sand. The land cools faster than the sea once the sun goes down, and the slow-cooling water can release heat to nearby land during the night.HURRY ANSWER NOW AND I GIVE BRAINLY!!! HURYYY
1. A student left a sealed jar of water outside her home. Water can be a solid, liquid, or gas. When she put it outside, the water was a solid. Twelve hours later, the water had changed phase and was a liquid. What happened to the water molecules?
Answer:
A. "before the student left, the molecules we're moving in place. After, the molecules we're moving around each other.
Explanation:
Hope this helps. Please mark as brainliest if it did. :)
Describe what happens when two negatively charged particles interact with one another. (plz help 40 points!)
Answer:
When two negatively charged particles interact with one another, the particles repel with each other. Opposite charges attract while like charges repel. A negatively charged object will exert a repulsive force upon a second negatively charged object.
Explanation:
Use dimensional analysis to convert 74.9 dry quarts to liquid quarts.
Answer:
87.2 liquid quarts (US)
Look at the picture. If one of the lightbulbs breaks or is removed, what will happen to the other lightbulb?
2 bulbs and a battery in a single loop of wire.
Question 2 options:
It will stay on
It will go off
It will change colors
It will burn out
HERES ANOTHER FOR YOU GUYS! :)
Answer:
It will go off.
Explanation:
Since the two bulbs are connected in series with the battery, when one bulb breaks breaks the circuit hence flow of current is stopped from moving to the other bulb
Matter that is made up of only one kind of Atom
Answer:
elements
Matter that has only one kind of atom is called an element. Gold, copper, oxygen, and mercury are examples of elements. Most matter is made up of two or more different kinds of atoms that are chemically combined. This kind of matter is called a compound.
Explanation:
Answer:
Element
Explanation:
This is the answer because:
1) All matter is made up of substances called elements.
2) Matter that iis made up of only one kind of Atom is called an Element.
Hope this helps! :D