1. Which of the following equations is balanced?
a. Al + Br2- 2A1Br3
b. 2Al + 2Br2 → 3AlBr3
c. 2Al + 3Br2 → 2AlBr3
d. Al + Br2 → AlBr3
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How much energy is required to boil 65 grams of 100°C water
And then heat the steam to 150°C?
Answer:
13598 J
Explanation:
Q = m × c × ∆T
Where;
Q = amount of energy (J)
m = mass (grams)
c = specific heat capacity
∆T = change in temperature
m = 65g, specific heat capacity of water = 4.184J/g°C, initial temperature= 100°C, final temperature = 150°C
Q = 65 × 4.184 × (150 - 100)
Q = 271.96 × 50
Q = 13598 J
Hence, 13598 J of energy is required to boil 65 grams of 100°C water and then heat the steam to 150°C.
Show your work with good use of units, rounding, and significant figures. [Hint: it is good practice to show the value of your answer before you round off to the final answer with the correct significant figures!]
(8 points) How much heat is required to convert 10.00 g of ice at –20.00°C to water at 25°C. The specific heat of ice is 2.09J/g°C; the specific heat of water is 4.182 J/g°C; the heat of fusion is 333.0 J/g.
Group of answer choices
Heat required : 4.8 kJ
Further explanationThe heat to change the phase can be formulated :
Q = mLf (melting/freezing)
Q = mLv (vaporization/condensation)
Lf=latent heat of fusion
Lv=latent heat of vaporization
The heat needed to raise the temperature
Q = m . c . Δt
1. heat to raise temperature from -20 °C to 0 °C
[tex]\tt Q=10\times 2.09\times (0-(-20)=418~J[/tex]
2. phase change(ice to water)
[tex]\tt Q=10\times 333=3330~J[/tex]
3. heat to raise temperature from 0 °C to 25 °C
[tex]\tt Q=10\times 4.18\times (25-0)=1045~J[/tex]
[tex]\tt Q~tot=418+3330+1045=4793~J\rightarrow rounding~and~2~sig~figs=4.8~kJ[/tex]
Which of the following are examples of chemical energy being released or stored? (2 points)
A boy eating an orange to survive
A car burning gasoline to move
The sun heating a rock
Select two answers
a local reaction is when a chemical enters the bloodstream? true or false
Answer:
true!
Explanation:
One way to represent a model of an atom is in a drawing. What is another way to show an atomic model?
I think by writing electronic configuration.
Another way of representing an atomic model is the use of periodic table
There are different ways in which an atom can be modelled and some of these methods includes:
The use of the periodic tableThe Bohr- Rutherford modelThe Lewis structure IonsAll the ways listed above can be used to model/represent an atom graphically ( drawing ). while the periodic table can be used to model an atom into its element without drawing. The periodic table makes use of valance numbers of the atoms and chemical similarities between atoms when modeling an atom.
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Exactly how many planes contain points J, K, and N?
O 0
O 1
O 2
O 3
Answer:
0
Explanation:
Point J is on neither plane X or plane Y. Hope this helps you.
Answer:
3
Explanation:
The ampere is a unit of
A. magnetism.
B. electric current.
C. electric charge.
D. temperature.
Answer: B
Explanation:
The reason its B because Ampere, unit of electric current in the International System of Units (SI), used by both scientists and technologists.
An electric current is a flow of electric charge in a circuit. More specifically, the electric current is the rate of charge flow past a given point in an electric circuit. The charge can be negatively charged electrons or positive charge carriers including protons, positive ions or holes.
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Which component is soluble in water
Answer:
salt
Explanation:
The following reaction shows calcium chloride reacting with silver nitrate.
CaCl2 + 2AgNO3 → 2AgCl + Ca(NO3)2
How many grams of Ca(NO3)2 are produced from 2,000.0 grams of AgNO3?
(Molar mass of Ca = 40.1 g/mol, Cl = 35.5 g/mol, O = 16.0 g/mol, Ag = 107.9 g/mol, N = 14.0 g/mol)
(Show your calculations for full credit. Correct answers will only receive partial credit.)
Grams of Ca(NO₃)₂ produced : 0.985 g
Further explanationA reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction
CaCl₂ + 2AgNO₃ → 2AgCl + Ca(NO₃)₂
MW AgNO₃ : 107.9+14+3.16=169.9
mol AgNO₃ :
[tex]\tt \dfrac{2}{169.9}=0.012[/tex]
mol ratio Ca(NO₃)₂ : AgNO₃ = 1 : 2, so mol Ca(NO₃)₂ :
[tex]\tt \dfrac{1}{2}\times 0.012=0.006[/tex]
MW Ca(NO₃)₂ : 40.1+2.14+6.16=164.1 g/mol
mass Ca(NO₃)₂ :
[tex]\tt 0.006\times 164.1=0.985[/tex]
When temperture changes matter undergo this. that is shift one form to another
Answer:All matter can move from one state to another. It may require extreme temperatures or extreme pressures, but it can be done. Sometimes a substance doesn't want to change states. You have to use all of your tricks when that happens. To create a solid, you might have to decrease the temperature by a huge amount and then add pressure. For example, oxygen (O2) will solidify at -361.8 degrees Fahrenheit (-218.8 degrees Celsius) at standard pressure. However, it will freeze at warmer temperatures when the pressure is increased.
Some of you know about liquid nitrogen (N2). It is nitrogen from the atmosphere in a liquid form and it has to be super cold to stay a liquid. What if you wanted to turn it into a solid but couldn't make it cold enough to solidify? You could increase the pressure in a sealed chamber. Eventually you would reach a point where the liquid became a solid. If you have liquid water (H2O) at room temperature and you wanted water vapor (gas), you could use a combination of high temperatures or low pressures to solve your problem.
Points of Change
Phase Changes: Pressure and temperature define the state of matter for water.Phase changes happen when you reach certain special points. Sometimes a liquid wants to become a solid. Scientists use something called a freezing point or melting point to measure the temperature at which a liquid turns into a solid. There are physical effects that can change the melting point. Pressure is one of those effects. When the pressure surrounding a substance increases, the freezing point and other special points also go up. It is easier to keep things solid when they are under greater pressure.
Generally, solids are more dense than liquids because their molecules are closer together. The freezing process compacts the molecules into a smaller space.
There are always exceptions in science. Water is special on many levels. It has more space between its molecules when it is frozen. The molecules organize in a specific arrangement that takes up more space than when they are all loosey-goosey in the liquid state. Because the same number of molecules take up more space, solid water is less dense than liquid water. There are many other types of molecular organizations in solid water than we can talk about here.
CHEMISTRY TERM PHASE CHANGE
Fusion/Melting
Freezing
Vaporization/Boiling
Condensation
Sublimation
Deposition
Solid to a Liquid
Liquid to a Solid
Liquid to a Gas
Gas to a Liquid
Solid to a Gas
Gas to a Solid
Explanation:
What is the total amount of matter in an ecosystem doing?
AnsThe flow of matter in an ecosystem is not like energy flow. Matter enters an ecosystem at any level and leaves at any level. So, its always flowingwer:
Explanation:
How would adding the catalyst nitrogen monoxide (NO) affect this reaction?
2SO2(g) + O2(g) → 2SO3(g)
A) NO increases the rate at which SO3 molecules are formed.
B) NO reacts with SO3 to produce more SO2 molecules.
C) NO decreases collisions between the SO2 and O2 molecules.
D) NO increases the concentration of the SO2 and O2 molecules.
E) NO increases the activation energy of the SO2 and O2 molecules.
Answer: A) NO increases the rate at which [tex]SO_3[/tex] molecules are formed.
Explanation:
A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more reactant molecules can cross the energy barrier by undergoing collisions and convert to products.
[tex]2SO_2(g)+O_2(g)\rightarrow 2SO_3(g)[/tex]
Thus NO will increase the rate of reaction by lowering the activation energy and thus the colllisions among [tex]SO_2[/tex] and [tex]O_2[/tex] molecules will incraese which in turn will lead to formatioon of more [tex]SO_3[/tex] molecules.
Answer:
A) NO increases the rate at which molecules are formed.
Explanation:
PLATO
How many grams are there in 0.75 moles of Sodium
Answer:
44g
Explanation:
The
the surface area of the reactants, the faster the reaction rate.
A. greater
B. lesser
A scientific ________ must have a control, so that the variables that could affect the out come is reduced. A:experiment B:conclusion. C:investigation. D:reasoning
Answer:
A.experiment
Explanation:
hope this helps
Why are you able to smell things across a room or form great distances
Answer:
We smell hot food from distance because of the diffusion process. Diffusion is the spreading out and intermixing of particles From one substance into another substance due to the movement of particles.
Explanation:
Balance the following:
Reactants Products
B2+ _W2->BW3
Answer: B2 + 3W2 ---> 2BW3
Explanation:
You have 2 B on the right and 1 B on the left to balance out B, you need to add 2 wich gives you 6 W on the left and 2 W on the right. To baance W on both sides you add a 3 to the W on the right which gives you 6 W on both sides.
It takes much less energy to change the temperature of oil than it does to change the temperature of water
Answer:
i think so
Explanation:
What is the density of laughing gas (N2O) at STP?
Help please
Answer:
1.977 g/L
Nitrous oxide
Names
Molar mass 44.013 g/mol
Appearance colourless gas
Density 1.977 g/L (gas)
Melting point −90.86 °C (−131.55 °F; 182.29 K)
Help me ASAP Pls!!!!
Answer:
the answer is the second option
Explanation:
hope you have a great day though!
How many chlorine aHow many chlorine atoms are there in 4 molecules of CH2Cl2?
Study this image of the process of photosynthesis. What's wrong with the image? oxygen ohlorpohyll Glucose carbon dioxide water O A Sun rays are shown on the right side of the image. ов. Carbon dioxide is shown as an input. OC. Oxygen is shown as an input. G OD Water is shown as an input.
Answer:
A
Explanation:
help with this question please i will mark you brainliest!!!
Answer:
b
Explanation:
Heated gaseous atoms of elements emit light in unique colored patterns as electrons drop from
excited energy states to ground energy states. Heated hydrogen atoms have only four colored
lines, red, green, blue and violet. What prediction did Niels Bohr make about electrons based on
this information?
Answer:
b
Explanation:
Convert 27 degrees Celsius to Kelvin
OOK
300 K
O 27K
327 K
Answer:
300 K
Explanation:
add 273 to change to kelvin
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Eating around chemicals in the work place is considered safer because today’s chemicals are more diluted than in the past
Pleas e help I will mark brainy
Answer:
D
Explanation:
Hope this helps
consider this equation S + 3O₂ → 3O₃ Is this equation balanced? why or why not?
Answer:
This equation is not balanced because you don't have the same amount of each element on each side of the chemical reaction. The balanced equation is:
2 S + 3 ⇒ 2
The law of conservation of matter states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products.
Then, you must balance the chemical equation. For that, you must first look at the subscripts next to each atom to find the number of atoms in the equation. If the same atom appears in more than one molecule, you must add its amounts.
The coefficients located in front of each molecule indicate the amount of each molecule for the reaction. This coefficient can be modified to balance the equation, just as you should never alter the subscripts.
By multiplying the coefficient mentioned by the subscript, you get the amount of each element present in the reaction.
Then, taking into account all of the above, you can determine the amount of elements on each side of the equation:
Left side: 1 sulfur S and 6 oxygen O (coefficient 3 multiplied by sub-index 2)
Right side: 1 sulfur S and 3 oxygen O (subindice value)
As you can see, you have the same amount of sulfur on both sides of the equation but the amount of oxygen is different. This indicates that the chemical equation is not balanced. To balance it, as the amount of sulfur is the same, the amount of oxygen must be balanced, which is different on each side of the reaction.
A simple way is to balance the equation is to multiply the product by 2, that is, add a coefficient 2 in front of the SO3 molecule, the reaction being as follows:
S + 3 ⇒ 2
Now the amount of elements on each side of the equation is:
Left side: 1 sulfur S and 6 oxygen O (coefficient 3 multiplied by subindice 2)
Right side: 2 sulfur S and 6 oxygen O (coefficient 2 multiplied by subindice 3)
The oxygen is now balanced, but the amount of sulfur on both sides of the reaction varies. To balance the quantities of sulfur, as now on the right side you have an amount of 2, you can add the coefficient to sulfur. The chemical equation is as follows:
2 S + 3 ⇒ 2
Now the amount of elements on each side of the equation is:
Left side: 2 sulfur S and 6 oxygen O (coefficient 3 multiplied by subindice 2)
Right side: 2 sulfur S and 6 oxygen O (coefficient 2 multiplied by subindice 3)
Finally you have the same amount of sulfur and oxygen on both sides of the reaction. So the chemical equation is finally balanced.
Explanation:
Brainliest please?
Answer:
it is balenced beacuse both sides have the same ammount of particals
Explanation: