Answer:
It's true
Explanation:
Uhhh, the internet! lol.
Answer:
It's true, ExplanationVVVExplanation: Because the order of elements is based on atomic number, vertical families share similar chemical properties.
I don't really understand this worksheet question.
Analyze. This reaction releases energy as heat. Explain whether the reaction is exothermic or endothermic and whether it obeys the laws of Conservation or energy
Answer:
See explanation
Explanation:
If heat is given out in a reaction, then that reaction is exothermic. If heat is absorbed in a reaction, then that reaction is endothermic.
Hence, if heat is given out, the reaction is exothermic. The heat given out does work on the surrounding thus the laws of conservation of energy are obeyed.
Answer:
The reaction is exothermic.
Explanation:
I took the test
Rico is doing an experiment. He makes a solution of calcium carbonate in a beaker of 200 mL of water at room temperature (25 °C). He adds a small amount of lemon juice to the solution and a chemical reaction begins. Rico reduces the temperature of the solution by 10 °C by adding ice. As the solution cools, what will happen to the chemical reaction?
The question is incomplete, the complete question is;
Rico is doing an experiment. He makes a solution of calcium carbonate in a beaker of 200 mL of water at room temperature (25 °C). He adds a small amount of lemon juice to the solution and a chemical reaction begins. Rico reduces the temperature of the solution by 10 °C by adding ice. As the solution cools, what will happen to the chemical reaction?
A. The chemical reaction will stop suddenly.
B. There will be no change in the rate of the chemical reaction.
C. The chemical reaction will slow as the water cools.
D. The speed of the chemical reaction will increase as the water cools.
Answer:
C. The chemical reaction will slow as the water cools.
Explanation:
The rate of a chemical reaction is dependent on the temperature of the reaction system. This derives directly from the collision theory of chemical reaction.
The higher the temperature of the system, the more frequently the particles collide and the faster the rate of reaction.
As the temperature is decreased, the rate of reaction decreases simultaneously. Therefore, as Rico decreases the temperature from 25 degrees to 10 degrees, the rate of reaction decreases accordingly.
what percent of the sun's energy is used by the living organism on earth
a. 1%
b. 10%
c. 20%
d. 35%
e. 50%
CARDS
In a science experiment, Marisa concludes that no chemical reaction has occurred. What evidence would support
this conclusion?
A. the mass and total number of atoms were conserved
B. no energy were released
C. a new element was created
D. no new substance was formed
Answer:d
Explanation:
How do we know that caramelizing sugar is a chemical change?
It involves dissolving sugar in water.
It changes the state of sugar from a solid to a liquid.
It separates sugar fromn a sugar solution.
It changes the sugar's color.
Answer:
Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
Explanation:
caramel is the product of the sugar and hot water
Answer:
D It changes the sugars color
Explanation:
Because the change of color is a chemical change.
Have a splendid day! I hope you like the answer given.
hi can someone pls help me it’s important i’m studying for my finals
Answer:
i think the answer is D)
but u should ask the another person too:)
WILL GIVE BRAINLIEST THANK YOU
Choose all the answers that apply.
Which of the following are types of changes that can happen in the rock cycle?
metamorphic to metamorphic
igneous to sedimentary
sedimentary to metamorphic
igneous to metamorphic
metamorphic to sedimentary
Answer:
igneous to metamorphic
sedimentary to metamorphic
5. __HCl + __NaOH-> __NaCl + __H2O
6. __FeS + __HCl-> __H2S + __FeCl2
7. __C2H4 + __O2-> __CO2 + __H2O
What are the balanced equations?
Answer:
5. balanced (1,1,1,1)(double replacement)
6. 1,2,1,1 (double replacement)
7. 1,3,2,2 (combustion)
Explanation:
please make me brailiest
What is the percent of Nitrogen in NH3?
Answer:
82.244%
Explanation:
The mass percent is an important method which is used to calculate the concentration of a solution. The mass percent of nitrogen in NH₃ is 82.2%.
What is mass percentage?The mass percentage of a particular component in a compound can be defined as the ratio of the mass of the particular component to the total mass of the compound.
The equation which is used to calculate the mass percentage is:
Mass percentage = Mass of the component / Total mass of the compound × 100
or
The mass percentage is also calculated as:
% Mass = Mass fraction × 100
Here the mass of 'N' = 14.00 g
The molar mass of NH₃ = 17.031 g/mol
% Mass of 'N' = 14.00 / 17.031 = 0.82
0.82 × 100 = 82.2 %
Thus the mass percentage of nitrogen is 82.2 %.
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What is the relationship between an object's mass and its ability to pick up speed, or accelerate?
Answer:
It is momentum
Since momentum is proportional to the product of mass and velocity
Answer:
The greater the object's mass, the longer it takes to pick up speed or accelerate. There is an inverse relationship between mass and acceleration/picking up speed.
Explanation:
Mole Conversions
What is the mass in grams of
0.625 mol Ba(NO3)2?(please show work)
Answer:
Explanation:
Using the formula as follows: mole = mass/molar mass
Molar mass of Ba(NO3)2
= 137 + (14 + 48)2
= 137 + 124
= 261g/mol
Mole = mass ÷ molar mass
0.625 mol = mass/261g/mol
mass = 0.625 × 261
mass = 163g
____ Al(NO3)3 + ____ FeCl2 --> _____ Fe(NO3)2 + ______AlCl3
~
how to fix/ balance this chemical reaction?
The balanced equation
2Al(NO₃)₃ + 3FeCl₂ ⇒ 3Fe(NO₃)₂ + 2AlCl₃
Further explanationGiven
Reaction
Al(NO₃)₃ + FeCl₂ --> Fe(NO₃)₂ + AlCl₃
Required
Balanced equation
Solution
Give a coefficient
aAl(NO₃)₃ + bFeCl₂ --> Fe(NO₃)₂ + cAlCl₃
Make an equation
Fe, left=b, right=1⇒b=1
N, left=3a, right=2⇒3a=2⇒a=2/3
Cl, left=2b, right=3c⇒2b=3c⇒2.1=3c⇒c=2/3
The equation becomes :
2/3Al(NO₃)₃ + FeCl₂ --> Fe(NO₃)₂ + 2/3AlCl₃ x3
2Al(NO₃)₃ + 3FeCl₂ --> 3Fe(NO₃)₂ + 2AlCl₃
Does SiO2 also equal Si2O4?
(silicon atom 1 oxygen atom 2 = silicon atom 2 oxygen atom 4?)
Answer:
7
Explanation:
that is the anwer of the question
PLEASE HELP WITH #3 I WILL GIVE BRAINLEIST!
Answer:
i thunk venus may be right or wrong tel7
Answer:
saturn:85 minutes
venus: 4.25 minutes
Question 10
Which of the following is a sign that you might be in an extremely unsafe situation?
A) you see frayed electrical cords on the machine you are asked to use
B) other workers are getting burned on the fryer that you are supposed to use
C) you are shown a forklift truck - something you have never operated before -
and told to move a heavy load of materials across the warehouse floor
D) only a) and c)
E) all of a), b), and c)
Answer:
Here it would be A,B and C because all the examples are violating safety precautions. They are all examples of un safe signs.
Hope this helps
Explanation:
Create a creature the reproduces asexually
Answer:
Hydra bud
Explanation:
this plant reproduces asexually
What is the charge of the nucleus ? Why ?
Answer:
A nucleus is a positive charge
Explanation:
A nucleus is made up of protons and neutrons. Protons have a positive charge and neutrons have a neutral charge.
What is “rounding down”?
Answer:
if the number is 4 or less than you can round down but if it's 5 or more round up
Explanation:
It makes the number simpler by making it smaller. Ex. 34 would round down to 30, 43 would round down to 40
Which term refers to the simplest form of matter that cannot be broken down chemically?
A.Element
B.compound
C.Mixture
D.solution
Answer:
I believe the answer is A, an Element.
Explanation:
It's a substance that cannot be broken down into simpler substances. If I'm wrong, let me know!
What type of reaction is this:
C + 02 --> CO2
Answer:
synthesis reaction
Explanation:
A + X --> AX
Answer:
Combustion reaction
Explanation:
An 18.0 g piece of an unidentified metal was heated from 21.5 °C to 89.0 °C. If 789.75 J of heat energy was absorbed by the metal in the heating process, what was the identity
of the metal?
Answer: The metal is Calcium.
Explanation:
To calculate the specific heat of substance during the reaction.
[tex]q=m\times c\times \Delta T[/tex]
where,
q = heat absorbed = 789.75 J
c = specific heat of metal = ?
m = mass of substance = 18.0 g
[tex]\Delta T_f[/tex] = final temperature - initial temperature = [tex](89.0-21.5)^0C=67.5^0C[/tex]
Now put all the given values in the above formula, we get:
[tex]789.75J=18.0g\times c\times 67.5^0C[/tex]
[tex]c=0.65J/g^0C[/tex]
As specific heat is characteristic of each metal and thus the metal is calcium which has specific heat of [tex]0.65J/g^0C[/tex]
Which properties most likely belong to a metal?
A. brittle and dull
B. liquid and clear
C. ductile and malleable
D. gaseous and unreactive
The properties most likely belong to a metal are ductile and malleable.
What is ductility and Malleability?Malleability - Those metals that can be beaten into thin sheets with a hammer or any heavy object. For example - Cu, Au etc
Ductility- The property of the metals which can lead the metals to form them into wires.
Conductivity - Conductivity is the measure of the ease at which an electric charge or heat can pass through a material. For example - Metals are good conductors of heat and electrolytic solution is conductors of electricity.
Metals have many other properties including the given above, like sonority, lustrous surface, very hard etc.
Therefore, The properties most likely belong to a metal are ductile and malleable.
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11. Describe a procedure you would use to separate a mixture of iron filings, water, and clay. Be clear
about what would happen at each step.
Answer:
Filtration is commonly the mechanical or physical operation which is used for the separation of solids from fluids (liquids or gases) by interposing a medium through which only the fluid can pass.
Explanation:
hopefully this helps
6
Which subatomic particle can be found revolving around the nucleus?
proton
neutron
electron
Answer : The correct option is, electron.
Explanation :
As we know that,
An atom is the smallest unit of a matter that consist of three subatomic particles which are electrons, protons and neutrons.
The protons and the neutrons are located inside the nucleus or the center of the nucleus where the mass of the an atom is concentrated.
The electrons are located around the nucleus.
The protons are positively charged, the electrons are negatively charged and the neutrons are neutral that means it has no charge.
According to the question, the electron subatomic particle found revolving around the nucleus.
Hence, the correct option is electron.
3. The air today is approximately one-fifth
oxygen. Calculate the approximate volume of
oxygen in 200cm3 of air.
Answer: 40cm^3
Explanation:
Since the The air today is approximately one-fifth oxygen, the approximate volume of oxygen in 200cm3 of air would be:
= 1/5 × 200
= 40cm
The answer is 40cm^3
If the length, width, and height of a box are 9.50 cm, 6.75 cm and 3.50 cm, respectively, what is the volume of the box in units of milliliters and liters?
(a) How many mL will the box contain?
(b) How many L will the box contain?
Answer: 1cm³= 1mL
Explanation:
Describe what the greenhouse effect is and how it is caused on a molecular level.
The greenhouse effect can be cause as the process by which the temperature of the surface of the earth increases because of the earth's atmosphere. On the molecular level, greenhouse effect will be caused by the molecules of the some chemicals, called as the greenhouse gases.
When the some of the infrared radiation coming from the Sun and passes through the atmosphere, but the most of it absorbed and it will re-emitted in all the directions by the greenhouse gas molecules and the clouds. This effect is to warm the Earth's surface and will the lower atmosphere.
As the infrared radiation and the heat will be trapped and the recycled in between the atmosphere and the planet, it will generates the heat cycle.
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Please help me with this question please!!!
Look at the picture provided and answer the question
>>Select one only.
Q:An aromatic hydrocarbon is represented by which structural formula?
>>Choose one answer from the picture below that answers the question above
A
B
C
D
Answer:
A
Explanation:
I looked up aromatic hydrocarbon and this one looks like a replica of benzene
please help! 35 points for a valid answer!
how is the potential (voltage) of a redox reaction determined using the reduction potential chart calculate the voltage for the equation in 3(a)
Answer:
Oxidation half reaction is written as follows when using using reduction potential chart
example when using copper it is written as follows
CU2+ +2e- --> c(s) +0.34v
oxidasation is the loos of electron hence copper oxidation potential is as follows
cu (s) --> CU2+ +2e -0.34v
Explanation:
Answer:
The potential difference is caused by the ability of electrons to flow from one half cell to the other. Electrons are able to move between electrodes because the chemical reaction is a redox reaction. ... The cell potential (Ecell) is measured in voltage (V), which allows us to give a certain value to the cell potential.
Explanation: