Answer:
2Mg (s) + CO₂ (g) → 2MgO (s) + C (s)
General Formulas and Concepts:
Chemistry - Reactions
Reaction PredictionBalancing RxN'sExplanation:
Step 1: Define RxN
Mg (s) + CO₂ (g) → MgO (s) + C (s)
Step 2: Balance RxN
2Mg (s) + CO₂ (g) → 2MgO (s) + C (s)
We need to balance the number of O's on both sidesIf we balance the O's, we will also need to balance the Mg'sSOMEONE HELP ME PLEASE ILL GIVE BRAINLY!
Is the following picture an example of a chemical change or a physical change?
A chemical change, because the atoms are rearranging to form new molecules.
A physical change, because the molecules are staying the same.
A chemical change, because the molecules are staying the same.
A physical change, because the atoms are rearranging to form new molecules.
Answer:
It would be a physical change, because the atoms are rerranging to form new molecules!
Explanation:
PLEASE HELP ME !!!!!!!
Answer:
it would be 5,045
Explanation:
because it is closer to 5,000. pls correct me if wrong
Question 14
1 pts
How many moles of NaCl could be found in 0.4 L of a 0.9 M solution? Round your answer to
two decimal places.
Answer:
0.36mol
Explanation:
Given parameters:
Volume of NaCl = 0.4L
Molarity = 0.9M
Unknown:
Number of moles = ?
Solution:
To find the number of moles, the molarity of a solution is the amount of solute contained in a solution.
Molarity = [tex]\frac{number of moles}{volume}[/tex]
Number of moles = molarity x volume
Insert the parameters and solve;
Number of moles = 0.4 x 0.9 = 0.36mol
Why should a hypothesis be testable?
A. It must be testable in order to be found true or false.
B. It must be testable for the outcome to be predictable.
C. It must be testable for other scientists to consider it reliable.
D. It must be testable if it is to become a scientific theory.
What causes rain to precipitate from clouds?
Answer: Precipitation forms in the clouds when water vapor condenses into bigger and bigger droplets of water. When the drops are heavy enough, they fall to the Earth.
Explanation: Have a blessed day!
Answer: Precipitation forms in the clouds when water vapor condenses into bigger and bigger droplets of water. When the drops are heavy enough, they fall to the Earth.
Explanation:hope this helps u
What igneous rock is non-vesicular and glassy in texture and has a mafic composition?
Answer:
igneous rock
Explanation:
how do i do the chemicals
you have to put them togeter
I WILL GIVE BRANLIEST What factor is the temperature in an ecosystem? Abiotic or Biotic?
Answer:abiotic .
Explanation:
A wave is a _____that transfers _____ through a ______
A.) medium, disturbance, energy
B.) disturbance, energy, medium
C.) energy, disturbance, medium
D.)disturbance, medium, energy
A wave is a disturbance that transfers energy through a medium. There
are types of such as sound and light waves.
A wave involves the transfer of energy such as sound, light waves etc
through a medium. The medium could be through liquids , solids or air and
they have characteristic waves which pass through them.
When a wave transfers energy through a medium, the matter involved
doesn't experience any type of movement.
Read more on https://brainly.com/question/19210453
The sum of the protons and neutrons in an atom equals the?
nucleus number
atomic number
atomic mass
mass number
Answer:
mass number
Explanation:
The sum of the protons and neutrons in an atom equals the mass number of such an atom.
Mass number is the mass of an atom. The mass of an atom is concentrated in the nucleusThe particles in the nucleus are the protons and neutrons.So;
Mass number = number of protons + number of neutrons.
how is a solute and a solvent different
Which is more electrically negative? 1)C 2)P or 3)S
GUYS PLEASE HELP!!! :((
Answer:
3 sulphur is more electrically –
A very hot cube of copper metal (32.5 g) is submerged into 105.3 g of water at 15.4 0C and it reach a thermal equilibrium of 17.3 0 Calculate the initial temperature of copper (Cs = 0.385 J/g 0C for copper, and 4.18 J/g 0C for water).
Answer:
The initial temperature of the metal is 84.149 °C.
Explanation:
The heat lost by the metal will be equivalent to the heat gain by the water.
- (msΔT)metal = (msΔT)water
-32.5 grams × 0.365 J/g°C × ΔT = 105.3 grams × 4.18 J/g °C × (17.3 -15.4)°C
-ΔT = 836.29/12.51 °C
-ΔT = 66.89 °C
-(T final - T initial) = 66.89 °C
T initial = 66.89 °C + T final
T initial = 66.89 °C + 17.3 °C
T initial = 84.149 °C.
Under a certain set of conditions, the percent yield of a reaction that produces carbon dioxide is 75.0%. What mass in grams of CO2 will actually be recovered if the theoretical yield is 26.7 grams?
Answer:
Actual yield = 20.03g
Explanation:
[tex]% yield = 100.\frac{actual yield}{theoretical yield}[/tex]% [tex]yield[/tex] = [tex]100. \frac{actual \ yield}{theoretical \ yield}[/tex]
Actual yield = % yield.(theoretical yield) / 100
Actual yield = 75.26.7/100
Actual yield = 20.025
Answer: I got 20.025 and then I rounded it to 20.0
Explanation:
How are elements and compounds a part of our daily lives?
Answer:
Aluminium (A1) -Used in the production of duralumin alloy for use in the construction of aeroplane bodies. 3. Silicon (Si) -To make microchips 4. Sulphur (S) -To make matches, fireworks and for the manufacture of sulphuric acid 5.
Explanation:
Hope this helped!
Answer:
yes
Explanation:
we use different elements and compounds in our life ex salt and iron but most of the substances found in our environment are mixture btw scientists need to classified substances to work with our substances and to study pure substances hope it helps u
Potato strips placed in a container of concentrated salt water will ultimately __.
Answer:
00000
Explanation:
A bus travels a distance 150km
in 5 hours where as another bus travel 200km in
6 hours which bus travel fast
Answer: The bus traveling 200km in 6 hours is traveling the fastest.
Explanation:
Bus 1
150km/5hrs
Simplify -> 30km/hr
Bus 2
200km/6hrs
Simplify -> About 33.333km/hr
How did the substance oxygen change the world??
Answer: The atmosphere of Earth wasn't always full of oxygen. ... An accidental mutation would some day change the world forever as these organisms would become able to feed off of the sunlight around them, and produce oxygen in a process known as photosynthesis. This oxygen, which none of these organisms could use, was toxic.
2. What properties do all acids have?
3. Why should you never use taste as a method for testing an unknown substance?
4. What is used to detect the presence of acids?
10. What can you use to detect the presence of a base?
11. What are some common bases that we use every day?
12. How does an antacid help reduce heartburn?
13. What happens when acid and base are mixed
14. What is used to determine the pH of a substance?
15. Describe how the pH scale works. In other words, what is it actually measuring?
17. Why is pH important to our environment?
18. Describe how salt is formed.
Pls help!!!!!
12.
Contrast and compare:
a) ionic and covalent bonding
Answer:
Ionic bonds - an intramolecular force exist in a nonmetal and metal compounds such as NaCl. The Na donate 1 electon to Cl to complete its octet rule.
Covalent bond - an intramolecular force exist in a nonmetal and nonmetal compounds such as bonds O2, Cl2, CO2, sugar, proteins and most of organic compounds and biomolecules by sharing electrons to bond.
There are two types of covalent bonds: polar and nonpolar. Polar bond is a bond between two different nonmetal atoms of different electronegativities. While nonpolar bond is a bond between the same atom or two differenct atoms of the same electronegativities (if there is). Their electronegativities pull will cancel so that their overall polarity is zero.
How many orbitals surround the nucleus in a neutral atom of sulfur (S)?
1
3
5
6
PLEASE HELP!!!!!!!!
Step 4: Create Lewis dot diagrams.
a) Draw Lewis dot diagrams of the reactants and products on the paper with your chemical equation.
b) Select a different color to use for each element in the chemical reaction. Use your chosen color
for the element’s symbol and for its valence electrons.
c) Label these diagrams “Lewis Dot Diagrams.”
Answer:
Hey student your question is not proper arrange, i don't understand what you want us to do
In your own words, please explain how to name acids.
Answer:
Acids are named based on their anion — the ion attached to the hydrogen. In simple binary acids, one ion is attached to hydrogen. Names for such acids consist of the prefix “hydro-“, the first syllable of the anion, and the suffix “-ic”. Complex acid compounds have oxygen in them.
Question 4 of 10
What is the molarity of a solution of 3 moles (mol) of FeBr3 in 1/2 L water?
A.
3 mol/2L
B.
2L/3 mol
C.
0.5L/3 mol
D.
3 mol/0.5 L
SUBMIT
Answer:
B
Explanation:
Answer:
D. 3 mol/0.5 L
Explanation:
Just took the quiz
10 g of copper is heated and the mass increases to 12.5 g. What is the mass of the copper in the new substances?
Answer:
10g
Explanation:
The amount of copper in the heated mass of the new substance produced is still 10g because in any chemical action, mass is always conserved.
According to the law of conservation of matter "matter is neither created nor destroyed in a chemical reaction". The change in mass is only due to oxygen gas that combines with the new copper formed or other substances that joined the mass. The substance will still have the same amount of copper as the original one. Since we started with 10g of copper, we end with 10g of copper.please help me..........
Answer:
4/6
6/9
8/12
Explanation:
What is Jadi? is it goat? what language is Jadi?
I WILLL GIVE YOU BRAINLYESTTT PLEASE HELPPPP
Answer:
10.99s
Explanation:
Given parameters:
Speed of the fly = 9.1m/s
Distance flown = 100m
Unknown:
Time taken to fly this distance = ?
Solution:
Speed is distance divided by the time;
Mathematically;
Speed = [tex]\frac{distance}{time}[/tex]
Time = [tex]\frac{distance}{speed }[/tex]
Insert the parameters and solve;
Time = [tex]\frac{100}{9.1}[/tex] = 10.99s
3. Does the siren of a moving police car seem to change pitch to the
police officers inside the car? Why or why not?
Answer:
As the police car moves towards them, the pitch of the police car's siren goes up because the sound waves get closer together in front of the police car. When the police car moves away from the person, the pitch goes down because the waves spread out behind the police and that makes the frequency go down.
Explanation:
Benzoic acid, C6H5COOH, is another derivative of benzene. The pH of an aqueous solution of benzoic acid at 298 K is 2.95. Determine the concentration of hydroxide ions in the solution,
Answer:
[OH⁻] = 8.91x10⁻¹²M
Explanation:
In aqueous solutions, the [OH] and [H⁺] are associated in the equation of hydrolisis of water:
1x10⁻¹⁴ = [OH⁻] [H⁺]
With pH, we can solve for [H⁺] and obtain, the [OH⁻] using this equation:
pH = -log [H⁺]
[H⁺]= 10^-pH
[H⁺] = 1.122x10⁻³M
1x10⁻¹⁴ = [OH⁻] [1.122x10⁻³M]
[OH⁻] = 8.91x10⁻¹²MWhen the following equation is balanced, what is the coefficiant for Br?
___I2 +___NaBr rightwards arrow___NaI +_?_Br2
A.
6
B.
3
C.
1
D.
2
1 points
QUESTION 10
The previous question is an example of what type of chemical reaction?
A.
Synthesis
B.
Decomposition
C.
Single Re-Placement
D.
Double Re-Placement
Answer:
1. A 2. C
Explanation:
because it just is