A student heats a 2.5 g sample of calcium carbonate in a test tube. What mass of calcium oxide remains in the test tube when the reaction is complete?
CaCO3(s) = CaO(s) + CO2(g)
Select one:
a. 1.4 g CaO
b. 2.1 g CaO
c. 2.5 g CaO
d. 1.0 g CaO
Answer:
1.4 g CaO
Explanation:
Given data:
Mass of calcium carbonate = 2.5 g
Mass of Cao remain in tube = ?
Solution:
Chemical equation:
CaCO₃ → CaO + CO₂
Number of moles of CaO:
Number of moles = mass/molar mass
Number of moles = 2.5 g/ 100 g/mol
Number of moles = 0.025 mol
now we will compare the moles of CaO with CaCO₃.
CaCO₃ : CaO
1 : 1
0.025 : 0.025
Mass of CaO:
Mass = number of moles × molar mass
Mass = 0.025 mol × 56 g/mol
Mass = 1.4 g
Answer:
1.4g CaO
Explanation:
Did the exam and got it right. Hope this helps
PLEASE HELP DUE IN EXACTLY 15 mins!! i will give you branliest
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If 0.20 bushel is 1 dozen apples and a dozen apples has a mass of 2.0 kg, what is the mass of 0.50 bushel of apples?
Answer:
Mass of 0.50 bushel = 5 Kg
Explanation:
Given data:
Number of apples in 0.20 bushel = 1 dozen
Mass of 1 dozen apple = 2.0 Kg
Mass of 0.50 bushel apple = ?
Solution:
First of all we will calculate the number of dozen of apple in 0.50 bushel.
(1/0.20) ×0.50 = 2.5 dozen
Mass of 0.50 bushel = 2.5 dozen × 2.0 Kg/1 dozen
Mass of 0.50 bushel = 5 Kg
What is the name for the compound formed between nitrogen and magnesium. (show your work)
Answer:
the compound formed between nitrogen and magnesium is Magnesium Nitride
Tanisha is mixing powdered orange drink mix into a cup. She wants to make sure the orange taste is strong, so she adds a lot of powdered mix. As she is mixing, she notices that the powdered mix starts to float around in the water in clumps, and some settles on the bottom of the cup. Predict why this would happen.
A.
The powder is too old to dissolve in the water.
B.
No more powder will dissolve in the water.
C.
The powder needs to be shaken to fully dissolve.
D.
The powder does not fully dissolve because the water is too warm.
Answer:
B. No more powder will dissolve in the water.
Explanation:
If a lot of powder is added to the water, then a fully saturated solution would be created. This means that no matter how much more powder is added or how strong the mix is shaken, no more powder will disolve. The powder will instead remain in solid form in the solution.
Answer:
Heat up the water first because it increases solubility of the powdered mix.
Explanation:
Took the test on Edg. Hope this helps!! :)
Test Yourself
1- Which is larger:
a) Million or billion?
b) A part of million or a part of billion?
2- Which is more harmful: concentration of a poisonous substance (lead) in
drinking water to be a part of a billion or a part of a million?
Answer:
billion is larger \ part if billion
PLEASE HELP ME!!
Which shows three human body parts in order from the simplest level of organization to the most complex?
A. red blood cell → nervous system → bone tissue
B. nervous system → bone tissue → red blood cell
C. red blood cell → heart tissue → circulatory system
D. bone tissue → red blood cell → nervous system
Answer:
C
Explanation:
C. red blood cell → heart tissue → circulatory system
the order of organisation is
cell --> tissue --> organ --> organ system --> organism
hope this hepls x
branilest plz?
Answer:
C is the answer
the red blood cell are a part of the heart tissue which makes up the circulatory system
Draw the Lewis structure for SO2. How
many single bonds, double bonds, triple
bonds, and unshared pairs of electrons are
on the central atom, in that order?
1. 3, 0, 0, 1
2. 2, 1, 0, 0
3. 4, 0, 0, 0
4. 1, 1, 0, 1
5. 0, 0, 1, 1
6. None of these
7. 0, 1, 1, 0
8. 2, 0, 0, 2
9. 0, 2, 0, 0
10. 1, 0, 1, 0
Answer:
It should be 9
Explanation:
That’s how I remember drawing them I took chemistry last year. Tell me if it’s good.
Which of the following is not an advantage of asexual reproduction?
A. Quick
B. only involves one parent
C. genetic sameness
D. genetic variation
Answer:
a
Explanation:
How do secretions of apocrine glands differ from those of the eccrine sweat glands
Theresa creates an experiment where she mixes two red-colored substances together in a container and observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after eight minutes. What does this represent about the type of change happening in the container?
Complete Question:
Theresa creates an experiment where she mixes two red-colored substances together in a container and observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after eight minutes. What does this represent about the type of change happening in the container?
Group of answer choices
A. A chemical change started immediately and finished at eight minutes.
B. A non-chemical change started immediately and finished at eight minutes.
C. A chemical change occurred at four minutes.
D. A non-chemical change occurred at four minutes.
Answer:
A. A chemical change started immediately and finished at eight minutes.
Explanation:
A chemical reaction can be defined as the chemical process which typically involves the reaction between two or more chemical elements (substances) to form a new compound, through the rearrangement of the ionic or molecular structure of each chemical element.
This ultimately implies that, a chemical reaction is a chemical change that immediately starts when two or more molecules of a chemical element (substance) known as reactants are combined together to form a new product (compound).
In this scenario, Theresa creates an experiment where she mixes two red-colored substances together in a container and observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after eight minutes. Thus, what this represent about the type of change happening in the container is that, a chemical change (from red to blue) started immediately and finished at eight minutes.
If the current flowing from the supply is 0.12 A, what current will flow through 10 ohms resistor?
Worth 20 points and will mark brainliest!
If the resistor is in series to the voltage supply then 0.12A current will also flow through it.
(How the resistor is placed in relation to the supply is unknown)
The speed of light is 300,000,000 m/s. What is the frequency of microwaves with a wavelength of 0.01 meter?
Answer:
30,000,000,000 Hz
Explanation:
I searched it up and got 3 x 10^10 and thats 30000000000
why is the symbol Ar used in the electron configuration of potassium, and what does it represent?
Answer:
It represents the noble gas that precedes the period before Potassium.
Explanation:
Period before potassium is 3, the noble gas in that period is Ar (Argon). So when condensing the electron configuration of Potassium, Argon can account for 18 electrons instead of writing out 18 electrons in full form from 1s2, 2s2 etc.
do all-stars mak energy through fusions
What is the net force of the diagram?
The chemical formula for the ionic compound aluminum sulfite is Al2(SO3)3. Explain why there are 2 cations for every 3 anions in this compound.
Please help lol
Answer: It is a 2:3 ratio because Al has a +2 charge and S and O both have a -2 charge. It takes 2 Al to bring 3 SO3 to a neutral state.
Explanation:
please help me ASAP PLEASE
Explain the role of family and friends in socialisation.
Explanation:
Family is usually considered to be the most important agent of socialization. They not only teach us how to care for ourselves, but also give us our first system of values, norms, and beliefs. ... Another agent of socialization that relates to school is our peer group.
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Question 2
2 pts
(02.03 MC)
John writes a definition for speed and time,
Speed: Speed is the distance an object moves in an amount of time
Time: The amount of time is measured in seconds, minutes, or hours
Which statement is correct about John's definitions? (2 points)
Both definitions are incorrect.
Both definitions are correct.
The definition for speed is correct, the definition for time is incorrect.
The definition for time is correct, the definition for speed is incorrect.
Answer:
yes
Explanation:
the definition for time is correct, the definition for speed is incorrect
What is the name of the warm phase associated with melting ice and higher sea level? PLSSSSSSS ILL GIVE 5 STARS PLSSS JUST PLS HELP ME ITS FOR MY MIDTERM REVIEW ;-; ITS DUE TODAY!!! PLSSS
Global Warming
Explanation:
The melting of the polar ice caps due to mostly negative human interactions with the environment.
HUGE REWARD - 30 POINTS AND BRAINLY!
What is the atomic number of this element?
Answer:
7
Explanation:
ATOMIC NUMBER IS NUMBER OF PROTONS
PROTONS have positive charge
Answer:
7
Explanation:
sorry i accidentally put a 2 first
You discovered a new compound with the following formula: H(O) Pe. Using the information below, what would be the correct name for this compound?
*H(O) is an Alkaline Earth Metal.
*Pe is classified as a Halogen.
Answer:
Home personide.
Explanation:
In relation of Magnesium and Chlorine, MgCl2 is called Magnesium chloride
An acid that can donate only one hydrogen ion is called a _____ acid.
Answer:monoprotic
Explanation:
A molecule of __________ consists of two atoms of hydrogen and one atom of oxygen.
The chemical formula for water is __________.
Each hydrogen atom in a water molecule shares __________ valence electron(s) with the oxygen atom.
The chemical formula for carbon dioxide is __________.
The chemical formula CO represents the compound __________.
Atoms or ions in compounds are held together by chemical __________.
Three types of chemical bonds are covalent, ionic, and __________ bonds.
Answer:
WaterH2Oone pairCO2Carbon monoxide bondsmetallicAnswer:
A molecule of Water consists of two atoms of hydrogen and one atom of oxygen.
The chemical formula for water is H2O .
Each hydrogen atom in a water molecule shares one valence electron(s) with the oxygen atom.
The chemical formula for carbon dioxide is CO2 .
The chemical formula CO represents the compound carbon monoxide.
Atoms or ions in compounds are held together by chemical bond.
Three types of chemical bonds are covalent, ionic, and metallic bonds
What is the mass of .550 mL of alcohol (density = 82.0 g/mL)
Answer:
1.223 g/ml
Explanation:
Observe Record the appearance (colors,
textures, etc.) of the reactants in the data table.
How many reactants are there?
DONE
Answer:
1
Explanation:
By observing the appearance (colors, textures, etc.) of the reactants in the data one reactant is there.
What is reactant?A reactant is a substance or can say a chemical compound that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products.
For example we take a reaction-
O₂(g) + H₂(g) → H₂O(g)
Here, O₂ and H₂ are the reactants and H₂O is the product.
A reactant is present 100% initially and after sometimes it reduces gradually to form product according to chemical kinetics.
Given, the picture shown and the colour and texture of the reactant is shown.
Therefore, By observing the appearance (colors, textures, etc.) of the reactants in the data one reactant is there.
Learn more about chemical reactions, here:
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what is the correct name for the compound MgBr?
Answer:
Magnesium bromide
Explanation:
its just the answer give brianliest
Name and draw the lewis dot diagram for CuO
Answer:
lewis dot diagram for cuo is a bulletin dot above cu
Explanation:
Molecular Formula : CuO
name : Copper Oxide or cupric oxide
which example is a weak base?
ethyl alcohol, ammonia, potassium hydroxide or vinegar?
Answer:
potassium
Explanation:
b/c electronegativitu