Answer:
Na is most reactiveAlcuAu is less reactiveIN HEREAnswer:
Potassium (K)
Sodium (Na)
Calcium (Ca)
Magnesium (Mg)
Aluminium (Al)
Iron (Fe)
Lead (Pb)
Copper (Cu)
Silver (Ag)
Gold (Au)
Write a hypothesis that answers the lesson
question, "While observing a chemical reaction,
how can you tell which reactant is limiting?"
Hypothesis: If a substance is the limiting
reactant, then..
Answer:
the reaction will come to a halt and the other reactant will still be present.
A sample of copper is heated to 100°C and placed into a calorimeter containing 50 g of water at 25°C after a few minutes the final temperature of the system reaches 40°C how much heat in joules was released by the copper Sample
Answer:
Heat = 3138J
Explanation:
In the system, the sample of Copper is releasing heat that produce the increasing in the temperature of water.
Using the equation of calorimeter, we can find the heat released for the sample of copper (The same that is absorbed for the water):
Q = C×m×ΔT
Where Q is heat, C is specific heat (For water: 4.184J/molK), m is the mass of water (50g) and ΔT is change in temperature of water (40°C-25°C = 15°C)
Replacing:
Q = 4.184J/molK×50g×15°C
Q = 3138J is the heat released for the sample of Copper (The same absorbed for the water).
Answer:
heat=3138j
Explanation:
In the system, the sample of Copper is releasing heat that produce the increasing in the temperature of water.
Using the equation of calorimeter, we can find the heat released for the sample of copper (The same that is absorbed for the water):
Q = C×m×ΔT
Where Q is heat, C is specific heat (For water: 4.184J/molK), m is the mass of water (50g) and ΔT is change in temperature of water (40°C-25°C = 15°C)
Replacing:
Q = 4.184J/molK×50g×15°C
Q = 3138J is the heat released for the sample of Copper (The same absorbed for the water).
Which of the following type of matter has weakest interparticle force of attraction O a. Liquid water
O b. Iron
O c. Steam
O d. sand
Answer:(b)liquid water is correct option . Because it is a molecular solid and molecular solid has weak interparticle forces of attraction
Explanation:
What can form as a result of a chemical reaction?
Answer:
It form new chemical from chemical reaction
Answer:
Product
Explanation:
brainliest to whoever gets it the soonest, what SI unit do you use to measure the length of a book, and what tool and unit for the volume of a box?
Answer:
The SI unit of volume is the cubic meter (m 3 ), which is the volume occupied by a cube that measures 1 m on each side. This very large volume is not very convenient for typical use in a chemistry laboratory. A liter (L) is the volume of a cube that measures 10 cm (1 dm) on each side.
Suppose we want to charge a flask with 2.4 g of sugar. We put the empty flask on a balance and it is determined to weigh 150 g. What is the weight we would expect to see on the balance when we're done adding the sugar?
Answer:
152.4 g
Explanation:
given that
Weight of sugar = 2.4 g
Weight if empty flask = 150 g
All we have to do is add the weight of the empty flask with the weight of the sugar.
The sugar would be put inside an empty flask. This means that it's weight with that of the empty flask would be their new weight. Thus, the new weight is
New weight = weight of empty flask + weight of sugar
New weight = 150 g + 2.4 g
New weight = 152.4 g
therefore, the new weight is 152.4 g.
I hope this helps you
152.4 g
Given:-
Weight of sugar = 2.4 g
Weight if empty flask = 150 g
Add the weight of the empty flask with the weight of the sugar.
The sugar would be put inside an empty flask. This means that it's weight with that of the empty flask would be their new weight. Thus, the new weight is as follows:-
[tex]New weight = weight of empty flask + weight of sugar\\New weight = 150 g + 2.4 g\\New weight = 152.4 g[/tex]
Therefore, the expected weight is 152.4 g.
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Which atom would be neutral?
1an oxygen atom with 16 electrons, 18 protons, and 16 neutrons
2an oxygen atom with 4 electrons, 6 protons, and 4 neutrons
3an oxygen atom with 9 electrons, 8 protons, and 8 neutron
4an oxygen atom with 8 electrons, 8 protons, and 9 neutrons
Answer:
an oxygen atom with 8 electrons, 8 protons, and 9 neutrons
Explanation:
A proton has a positive charge and an electron has a negative charge. Magnitude of both of these charges is same. So, we need the same number of electrons and protons to make the atom neutral.
Neutron is neutral, so we can safely ignore it in this question.
Answer:
an oxygen atom with 8 electrons, 8 protons, and 9 neutrons
Explanation:
Suppose a compound is involved in three different reactions denoted R1, R2, and R3. Tripling the concentration of this reactant in all three reactions causes the rates of reaction to increase by factors of 3, 9, and 1, respectively. What is the order of each reaction with respect to this reactant? 1. R1 = 1; R2 = 2; R3 = 0
Answer:
The order of reaction is as follows, R1 = 1; R2 = 2; R3 = 0
Explanation:
The rate of a chemical reaction is the number of moles of reactants consumed per unit time or the number of moles of products formed per unit. the rate of a chemical reaction is affected by the concentration of reactants
The relationship between the rate of a chemical reaction and the concentration of its reactants is given by the rate law or equation.
Generally, the rate equation is given as;
Rate = k[A]ᵃ[B]ᵇ..., where k = rate constant which is independent of concentration of the reactants, [A] = concentration of reactant A, a = order of reaction A, [B] = concentration of reaction B, b = order of reaction B.
For the given reactions R1, R2 and R3
For R1; rate = 3, Concentration = 3[A]
3 = k[A]3ˣ
3¹ = k[A]3ˣ
Since rate is proportional to concentration, therefore, the order of reaction, x = 1
For R2; rate = 9, Concentration = 3[A]
9 = k[A]3ˣ
3² = k[A]3ˣ
Since rate is proportional to concentration, therefore, the order of reaction, x = 2
For R1; rate = 1, Concentration = 3[A]
1 = k[A]3ˣ
3⁰ = k[A]3ˣ
Since rate is proportional to concentration, therefore, the order of reaction, x = 0
Therefore, the order of reaction is as follows, R1 = 1; R2 = 2; R3 = 0
Choose all the answers that apply
Protons:
Have a positive change
Have no change
Are found in the nucleus
Orbit the nucleus
Have a negative charge
Iron and aluminum are examples of
Answer:
Iron and aluminum are both examples of metals that are used commonly in everyday life.
A hot metal plate at 150°C has been placed in air at room temperature. Which event would most likely take place
over the next few minutes?
Molecules in both the metal and the surrounding air will start moving at lower speeds.
Molecules in both the metal and the surrounding air will start moving at higher speeds.
The air molecules that are surrounding the metal will slow down, and the molecules in the metal will speed up
The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down
Answer:
d
Explanation:
What does light travel in?
Answer:
Light travels as a wave.
Explanation:
But unlike sound waves or water waves, it does not need any matter or material to carry its energy along. This means that light can travel through a vacuum—a completely airless space. (Sound, on the other hand, must travel through a solid, a liquid, or a gas.)
PLZ HELP ME Which of the following is the process by which chloroplasts use carbon dioxide, water, and sunlight to produce sugars and oxygen?
A. Photosynthesis
B. Cellular respiration
c. Reproduction
D. Homeostasis
Answer:
a
Explanation:
In a hospital, bags of saline solution are used to rehydrate patients. They are made by dissolving a specific amount of salt in water. What is the solvent in the saline solution?
A. Bag
B. Patient
C. Saline
D. Water
Water is the solvent in the saline solution. Hence, option D is correct.
What is the solute?A solute is something being dissolved, a solvent is a thing dissolving the item, and the solution is the mixture of the two items.
In a hospital, bags of saline solution are used to rehydrate patients. They are made by dissolving a specific amount of salt in water. Water is the solvent in the saline solution.
Hence, option D is correct.
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What is the molarity of 2 moles of a compound dissolved in 4 L of water?
A. 2 M
B. 0.5 M
C. 4M
D. 1 M
Answer:
[tex]\boxed {\boxed {\sf B. \ 0.5 \ M}}[/tex]
Explanation:
Molarity is a measure of concentration in moles per liter. The formula for calculating molarity is:
[tex]molarity= \frac{moles \ of \ solute}{ liters \ of \ solution}[/tex]
There are 2 moles of a compound or the solute. There are 4 liters of water or the solution.
moles of solute= 2 mol liters of solution = 4 LSubstitute the values into the formula.
[tex]molarity = \frac{ 2 \ mol}{ 4 \ L}[/tex]
Divide.
[tex]molarity= 0.5 \ mol /L[/tex]
1 mole per liter is equal to 1 Molar, so the solution's molarity of 0.5 mol/L is equal to 0.5 M.
[tex]molarity = 0.5 \ M[/tex]
The molarity of the solution is 0.5 Molar and choice B is correct.
3. What amount of
space is taken up by a rock that weighs 150 milligrams, and
has a density of 30 mg/ml? (Express your answer in Liters)
Hey there!:
Density = 30 mg/mL
Mass = 150 mg
Volume = ??
Therefore:
D = m / V
30 = 150 / V
V = 150 / 30
V = 5.0 mL
converts volume into liters :
5.0 mL / 1000 => 0.005 L or 5.0 x 10⁻³ L
Hope this helps!
How does antifreeze rely on colligative properties to work?
A. It causes the vapor pressure to increase and the increased outward pressure of the gasoline vapors prevents it from solidifying into ice.
B. It causes freezing point elevation which raises the temperature of the gasoline without letting it freeze.
C. It causes freezing point depression which requires the gasoline to reach a much lower temperature before freezing.
D. It causing boiling point elevation, which raises the temperature of the gasoline without letting it boil so that it can resist the cold.
WILL GIVE BRAINLIEST FOR CORRECT!!!
It causes freezing point depression which requires the gasoline to reach a much lower temperature before freezing. Hence, option C is correct.
What is the freezing point?Whenever a solute is added to a solution/solvent, it leads to depression in the freezing point of that solution/solvent. Depression in the freezing point of a solution on the addition of a solute is a colligative property.
A colligative property is a physical property which depends upon the number of solutes added not on the nature of solutes which means it does not matter whether we are adding 1000 particles of sugar or salt in water, the depression in the freezing point will occur by the same °C. Also, the more a solute is added the more will be the depression at the freezing point.
The formula for depression at the freezing point is mentioned as under:
Δ T = K x m
where Δ T = freezing point depression;
K = cryoscopic constant;
m = molality of the solution.
For example, The freezing point of water is 0 °C but as soon as we add a 92 gm solute like NaCl (common salt) in 1000 gm of water, its freezing point will be lower to −3.72 °C.
Hence, option C is correct.
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everyday problems related chemistry
MAINLY CONCENTRATED IN THE INDUSTRY.
Answer:
Compounds such as Sulphuric acid and Nitric acid present in polluted air and come into contact with rain water and form acid rain.
Explanation:
Fossil fuels contain such compounds like nitrogen sulphur in addition to carbon. Due to combustion of these fuels,large amount of sulphur dioxide and other compounds are discharged into atmosphere.these oxides dissolve in rain water forming mineral acids.
Copper turns a green-brown when it is exposed to oxygen in air. What chemical property of oxygen causes this effect? A. its reactivity B. its volume C. its mass D. its flammability
Answer:
A. its reactivity
Explanation:
It's reactivity because copper was exposed to air and if it is reactivity it must be exposed to air
Answer:
A. reactivity
Explanation:
If two solutions with concentrations of 0.4 M sugar and 0.7 M sugar respectively are separated by a semipermeable membrane, during osmosis there is a net flow of Group of answer choices sugar molecules from the dilute to the concentrated solution sugar molecules from the concentrated to the dilute solution water molecules from the concentrated to the dilute solution water molecules from the dilute to the concentrated solution
Answer: Water molecules from the dilute to the concentrated solution
Explanation:
During Osmosis if a solution is separerated by a semipermeable membrane, the solvent (typically water) from the less concentrated solution in terms of solute goes through the semipermeable membrane to the solution with the higher concentration so that the concentrations between the solutions can be balanced.
With the above solutions therefore, water molecules would move from the solution of 0.4M of sugar to the solution with a 0.7M of sugar through the semipermeable membrane.
During osmosis, water molecules move from the dilute to the concentrated solution.
OSMOSIS:
Osmosis is the movement of water molecules from a region of higher concentration (low concentration of solute) to a region of lower concentration (higher concentration of solute). The principle of movement is based on the concentration gradient i.e. difference in concentration across a semipermeable membrane. According to this question, two solutions have sugar concentrations of 0.4 M sugar and 0.7 M respectively and are separated by a semipermeable membrane. Therefore, water molecules will move from the dilute (0.4M) to the concentrated (0.7M) solution during osmosis.Learn more at: https://brainly.com/question/13655668?referrer=searchResults
Use the periodic table to determine which element the following spin diagram
represents:
(Using the image)
A. nitrogen
B. Oxygen
C. None of these
D. Boron
Answer:
B. Oxygen
Explanation:
Basically count each arrow since each arrow represents an electron. Then use the periodic table to find the element with 8 electrons, which is oxygen. Also, if you know the orbital patterns, you can identify that the 2p orbital represents an element in Group 16.
Question 14 (Essay Worth 10 points) (03.05 MC) Use complete sentences to differentiate between acids and bases on the basis of touch. Give an example of each type.
Answer:
Acid is a molecule capable of donating hydrogen ion and they form aqueous solutions with a sour taste while base is a substance that accepts proton from proton donor and in aqueous solution, they have an astringent or bitter taste. Moreover, a good example for base is sodium hydrogen carbonate as baking soda or baking powder and for acid, the most common example is the acetic acid or vinegar.
Answer:
Well, for starters, bases mostly consist of soaps and cleaning products, acids consist of vinegar,lemon,and stuff like that. Most acids on the basis of touch can burn your skin or be very sour, unlike bases which are more soapy and have a cleaner touch.A good example of an acid is vinegar, which can be used for cleaning but can also be used for making foods, on the other hand. A good example of a base is dish soap. It is used for cleaning.
Explanation:
i just did the exam and got a 100
how does activation energy affect the process of a reaction
Answer:
The activation energy increases how quickly the reaction will progress.
Explanation:
The activation energy of a chemical reaction is intimately linked to its rate. Particularly, the greater the activation energy, the slower the chemical reaction will be. The reason is: molecules can only finish the reaction as soon as they have reached the peak of the activation energy barrier. Many reactions possess such huge activation energies that they practically don't advance at all without an input of energy.
The activation energy of a particular reaction determines the rate at which it will proceed. The higher the activation energy, the slower the chemical reaction will be.
What is the oxidation state of fluorine (F)?
The Periodic Table
A.-2
B. +1
C. -1
D. +2
Answer:
It is C. -1
Explanation:
[tex] { \underline{ \sf{ \blue{christ \: † \: alone}}}}[/tex]
Balance the reaction which forms ions. Choose "blank" if no coefficient other than 1 is needed. ZnBr2 what Zn + + what Br-
1 or 2 or black
Answer: [tex]ZnBr_2\rightarrow Zn^{2+}+2Br^-[/tex]
Explanation:
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here zinc is having an oxidation state of +2 called as [tex]Zn^{2+}[/tex] cation and bromide is an anion with oxidation state of -1. Thus 2 atoms of [tex]Br^-[/tex] will combine with one [tex]Zn^{2+}[/tex] and written in simplest whole number ratios to give neutral [tex]ZnBr_2[/tex]
[tex]ZnBr_2\rightarrow Zn^{2+}+2Br^-[/tex]
What is the freezing point in °C) of a 0.743 m
aqueous solution of KCI?
Enter your rounded answer with
3 decimal places.
K; for water = 1.86 °C/m
Answer:
2.764 °C
Explanation:
ΔT = 2 x 1.86 C/m x 0.743m = 2.764C That means the freezing point of the solution is 2.764C less than the pure solvent (water)
Consider two bulbs seperated by a valce. Both bulbs are amintained at the same temperature. Assume that when the valve between the two bulbs is closed, the gases are sealed in their respective bulbs. When the valve is closed, the following data apply:
Bulb A Bulb B
Gas Ne CO
V 2.50L 2.00L
P 1.09 atm 0.73 atm
Assuming no temperature change, determine the final pressure inside the system after the valve connecting the two bulbs is opened. Ignore the volume of the tube connecting the two bulbs.
Answer:
The pressure is [tex]P_f = 0.93 \ atm[/tex]
Explanation:
From the question we are told that
The volume of Ne is [tex]V_N = 2.50 \ L[/tex]
The volume of CO is [tex]V_C = 2.00 \ L[/tex]
The pressure of [tex]Ne[/tex] is [tex]P_N = 1.09 \ atm[/tex]
The pressure of CO is [tex]P_C = 0.773 \ atm[/tex]
The number of moles of Ne present is evaluated using the ideal gas equation as
[tex]n_N = \frac{P_N * V_N}{R T}[/tex]
=> [tex]n_N = \frac{1.09 * 2.50 }{R T} = \frac{2.725}{RT}[/tex]
The number of moles of CO present is evaluated using the ideal gas equation as
[tex]n_N = \frac{P_C * V_C}{R T}[/tex]
=> [tex]n_N = \frac{0.73 * 2.00 }{R T} = \frac{1.46}{RT}[/tex]
The total number of moles of gas present is evaluated as
[tex]n_T = n_N + n_C[/tex]
[tex]n_T = \frac{2.725}{RT} + \frac{1.46}{RT}[/tex]
[tex]n_T = \frac{4.185}{RT}[/tex]
The total volume of gas present when valve is opened is mathematically represented as
[tex]V_T = V_N + V_C[/tex]
=> [tex]V_T = 2.50 + 2.00 = 4.50 \ L[/tex]
So
From the ideal gas equation the final pressure inside the system is mathematically represented as
[tex]P_f = \frac{n_T * RT }{ V_T}[/tex]
=> [tex]P_f = \frac{[\frac{4.185}{RT} ] * RT }{ 4.50}[/tex]
=> [tex]P_f = 0.93 \ atm[/tex]
Which natural resource is renewable?
coal
wind
topsoil
O oil
An example of natural resource that is renewable is wind. Details about natural resources can be found below.
What is natural resources?Natural resources are resources that cannot be exhausted i.e. can be replenished with time.
Examples of natural resources are as follows:
SunWindWaterForest treesTherefore, an example of natural resource that is renewable is wind.
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The natural resource that is renewable is wind. Therefore, option B is correct.
What are renewable resources?Renewable resources are natural resources that can be restocked or regenerated over a relatively short period of time, usually within a human lifetime. These resources are often contrasted with non-renewable resources, such as fossil fuels, which take millions of years to form and are finite in quantity.
Examples of renewable resources include solar energy, wind energy, hydroelectric power, geothermal energy, biomass, and tidal power.
These resources have the potential to provide energy and other materials indefinitely if used sustainably, making them an important part of efforts to move towards a more sustainable future. Therefore, option B is correct.
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Identify the difference between natural and artificial dyes.
Answer:
Natural dyes, although pure from chemicals, are often times more expensive than chemical dyes.
Answer: natural dyes is dye that it is anything that grow on earth that haven't been possessed and artificial dye mean that it is good for something in your body or something else
Explanation:i search it up
4. The mass of a silver liberty (coin) was measured three times and each measurement was made
to five digits. The mass values were 12.519 9.12.521 g, and 12.496 g. The average mass was
reported as 12.512 g.
Why is the average mass of the gold coin reported to five significant figures, even though you
had to divide by "3" to obtain the average?
Answer:
The average mass of the gold coin reported to five significant figures, even though you had to divide by "3" to obtain the average.
Explanation:
Given that,
The mass of a silver liberty was measured three times and each measurement was made to five digits.
The mass values are,
[tex]m_{1}=12.519\ g[/tex]
[tex]m_{2}=12.521\ g[/tex]
[tex]m_{3}=12.496\ g[/tex]
The average mass of the gold coin is 12.512 g.
We know that,
Significant figures :
Significant figures is explained the nonzero, leading zero and zeros between two nonzero digits.
For example,
The digits is 0.003405
In the digit, 345 = nonzero
0.00 = leading zero
The average mass of the gold coin reported to five significant figures because average mass is 12,512. All digits are nonzero.
Nonzero digit are significant.
Hence, The average mass of the gold coin reported to five significant figures, even though you had to divide by "3" to obtain the average.