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

Answers

Answer 1

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 2

Answer:

1.4g CaO

Explanation:

Did the exam and got it right. Hope this helps


Related Questions

An object is moving across a surface, but it does not gain or lose speed. Which best describes the object’s force?

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Answer:

Explanation:

the vector sum of all such forces which equals zero for an object at rest. CASE 1: Considering a basketball of weight 1kg, if it has been kept stationary on the ground, there are two forces acting on it. These are it's weight (gravity) and equal and opposite force from the ground (normal reaction).

Answer:

The net force is zero. :)

Explanation:

Is ceramic a good insulator

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Ceramics can withstand high temperatures, are good thermal insulators, and do not expand greatly when heated. ... Ceramics vary in electrical properties from excellent insulators to superconductors. Thus, they are used in a wide range of applications.

Part of an important cellular process involving a DNA strand is modeled below
12000
What is the purpose of this cellular process?
F Preserving genetic information for future generations
G Deleting the information in the sequence produced from the DNA template
# Transcribing information in the DNA sequence for use by the cell
J Producing more nucleotides for the DNA sequence

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Answer: transcribing information to the dna sequence for use by the cell

Explanation:

What is the molecular formula of the compound with a molecular weight of 112 g/mol and percent composition: 85.6% C and 14.4% H?
Select one:
a. C2H4
b. CH2
c. C4H8
d. C8H16

Answers

Answer:

Molecular formula = C₈H₁₆

Explanation:

Given data:

Percentage of hydrogen = 14.4%

Percentage of carbon = 85.6%

Molecular formula = ?

Molecular weight = 112 g/mol

Solution:

Number of gram atoms of H = 14.4/ 1.01 = 14.26

Number of gram atoms of C = 85.6/ 12 = 7.13

Atomic ratio:

            C                      :              H        

           7.13/7.13            :           14.26/7.13    

            1                      :                 2          

C : H = 1 : 2

Empirical formula is CH₂

Molecular formula:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

n = 112 / 14

n = 8

Molecular formula = n (empirical formula)

Molecular formula = 8 (CH₂)

Molecular formula = C₈H₁₆

The three types of ocean floor sediments are classified according to their _____.

Answers

Answer:

Origin

Explanation:

It’s origin. Good luck !

Which of the following scenarios would not prompt the cell to start dividing

Answers

Answer:

what r the options??????

Mercury is an element that forms during _____

Answers

Answer:

forms of mercury

Explanation:

Answer:

Explanation:

Mercury is an element and a metal that is found in air, water, and soil.Mercury rarely occurs uncombined in nature, but can be found as droplets in cinnabar (mercury sulfide) ores. China and Kyrgyzstan are the main producers of mercury. The metal is obtained by heating cinnabar in a current of air and condensing the vapour.

hope this helps! Have a good day or night! :)

what is the molar mass of nickel (ll) chloride(NiCl2)

Answers

Answer:

Explanation:

yt

Answer:

129.5994 g/mol

Explanation:

Which of the following chemical formulas contains the most molecules?
A. 5CO
B. 3H2O
C. 2Fe2O3
D. 4C3H8

Answers

C. 2Fe2O3 would be the correct answer!

someone help me plz :))) brainliest

Answers

Answer:

Option 2

Explanation:

What are some examples of HIGH resistance? Question 2 options:
long wire, wide wire, more resistors
wide wire, short wire, less resistors
long wire, narrow wire, more resistors
narrow wire, less resistors, long wire
(PLEASE HURRY! I NEED TO FINISH THIS QUIZ)

Answers

Answer:

long wire, wide wire, more resistors

long wire, narrow wire, more resistors

Explanation:

longer wires have greater resistance. The longer the wire the greater the resistance.

The answer is Long wire, Narrow wire, more resistors

Evidence:

How many elements are artificially made?

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Answer:

May be 119 elements are artificially made.

Answer:

119 elements are artificially made...

if a car travels 350 miles in 7 hours what was the speed

Answers

Answer:

50 mph

Explanation:

Answer:

5 miles per hour

Explanation:

TRUST ME

SOMEONE HELP ME PLEASE!!! ILL GIVE BRAINLY

Physical properties behave identically for all matter under the same conditions.

Physical properties cause atoms and molecules to change structure when substances are mixed.

Physical properties can be observed without changing the identity of a substance.

Physical properties are observed by seeing how a substance reacts with other substances.

Answers

Answer:

the answer is c

Explanation:

My reasoning is that its most likely

Reaction type
Li + N2
Li3N

Answers

Answer:

Combination or synthesis

Explanation:

The given reaction is:

            6Li +  N₂ → 2 Li₃N

This reaction is a synthesis or combination reaction. 6 moles of Li combines with nitrogen gas to produce 2 moles of  Li₃N.

In a synthesis reaction, two substances combines together to give singular product. The formation of compounds from the union of the constituent elements falls into this category of reaction.

4. (10 Points) Write a single replacement reaction where one of the reactants is
ammonium nitrate.
Include the states of matter for each of the reactants and products.

Answers

Answer:

For each balanced reaction, indicate the total number of atoms in the table below. Reaction. Total Number of Atoms. Reactant Side 1 Product Side. (Left).

Explanation:

What did you include in your response? Check all that
apply.
O No, thermal energy is not being transferred by
radiation in this image.
O The eggs are in direct contact with the metal pan,
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O Thermal energy is being transferred by conduction.
O Radiation transfers thermal energy by
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Answers

If you included all of them, check all
I’m just gonna explain it okay so if you included it in you paragraph response just check it off there is no right or wrong

Which of the following best describes the velocity of an object?
A B0 m/s
B 30 m east
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D 30 m/s2

Answers

The answer is c
30 m/s east

Answer:

[tex]\boxed {\boxed {\sf C. \ 30 \ m/s \ east}}[/tex]

Explanation:

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Here are some units of velocity:

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There are many other units, but m/s is the most common.

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Can someone help me please!(I will mark you brainliest)

Answers

Answer:

ok Look at it and tell me if you think its correct :}

which element has chemical properties that are most similar to potassium?
a. calcium
b. cesium
c. nitrogen
d. sulfur

Answers

Answer:

CESIUM

Explanation:

Potassium is one of the alkali metals. The alkali metals are the elements that make up Group 1 (IA) of the periodic table. The periodic table is a chart that shows how chemical elements are related to one another. The alkali metals also include lithium, sodium, rubidium, cesium, and francium.

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The element which contains similar chemical properties as of Potassium would be:

B). Cesium

'Potassium' is described as the element that is 'soft and waxy in appearance' with the symbol K and atomic number 19 and "Cesium' is also soft in nature and it possesses a goldy finish.

The similarity between the chemical properties of 'Potassium' and 'Cesium' include:

Both are the components of the group of alkali metals. Both of them are highly responsive metals. 'Potassium' and 'Cesium,' both are soft in texture.

Thus, option B is the correct answer.

Learn more about 'Chemical properties' here:

brainly.com/question/1728902

Are scientist improving the plant or corrupting it

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Answer:

46 percent of trees have been cut down.

Scienctists helps plants, but humans do destroy a lot of plants.

Scientists - helps increase plant growth.

Woodchoppers - helps decrease plant growth.

d. what happens when an iron nail is kept in copper sulphate solution?​

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Answer:

it changes color from blue to light green.

Explanation:

due to copper iron nail functions

Answer:

give the other person brainlieset plz

Explanation:

how do humans benefit from photosynthesis

Answers

Equally importantly, photosynthesis is the source of oxygen and also removes carbon dioxide from our atmosphere. Oxygen is required for cellular respiration, the process by which food is broken down into energy. Thus, human beings are also solely dependent on photosynthetic plants for their oxygen requirements.

Answer:

Explanation:

Without photosynthesis there would be no oxygen in the earth's atmosphere and we wouldn't be here!

What is the huge grouping of stars that rotate around a center of which the Sun and the solar are a part.

Answers

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Physical weathering
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Erosion
Deposition

Answers

Answer:

I think chemical Weathering

Answer:

Deposition is the answer

Explanation:

Determine the products of this unbalanced reaction: Select all that
apply
Ba
+
N2
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Answers

Answer:

Ba3N2

Explanation:

valency of barium is+2and nitrogen is-3.

A scientist thinks he found a new metal, so he published a paper about this metal. About 1 week after the scientist published the paper, you noticed a problem with the paper the scientist wrote. You noticed that this metal was not a new metal. In fact, this metal was discovered years ago. You determined this when you saw the atomic emission spectrum. As you read the article, you remembered that each atomic emission spectrum is unique to each element and the atomic emission spectrum matched one that was already discovered. Using the techniques from Chemistry, you ran a Flame Test with a piece of the metal (the metal is safe to use) that you had shipped to you. You found the metal turned the flame yellow. What metal did you have in your possession?

**ANSWER CHOICES**
*Barium
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Answers

Answer:

Sodium

because it burns with a yellow-orange flame.

Explanation:

It relates with Barium which burns with yellowish green flame

Which elements are abundant in visible universe

Answers

Hydrogen is the most abundant element in the Universe; helium is second. However, after this, the rank of abundance does not continue to correspond to the atomic number; oxygen has abundance rank 3, but atomic number 8. All others are substantially less common.

HOPE THIS HELPED <3

help meeeeeeeeeeeee its impossibleeeeee

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Answer:

Nice! If only....

Explanation:

Answer:

omg lol what even is this

A clear, pure liquid sample is brought into the lab and exposed to an electrical current. Different gases are
produced on each of the electrodes. The sample is -

a. an element
b. an alloy
c. a compound
d. a polymer

Answers

I think the answer is an element

The sample here is a compound. The correct option is c.

What is a compound?

A chemical compound is a substance made up of many identical molecules that contain atoms from more than one chemical element and are held together by chemical bonds.

A molecule made up of only one element's atoms is thus not a compound.

The anode undergoes oxidation, while the cathode undergoes reduction. The species being oxidized provides the electrons.

An electrode in an electrochemical cell is referred to as an anode or a cathode depending on the direction of electron flow.

The electrode reacts with the electrolyte at the anode, producing electrons.

These electrons build up at the anode. Meanwhile, another chemical reaction occurs at the cathode, allowing that electrode to accept electrons.

Thus, the correct option is c.

For more details regarding compound, visit:

https://brainly.com/question/13516179

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