Which of the following laboratory procedures best illustrates the law of conservation of mass? (Assume the product of the reaction includes the mass of any unused reactants.) (3 points)
Reacting 12 g of C with 32 g of O2 to form 44 g of CO2
Weighing 100 g of Cu powder and 100 g of Fe filings
Heating 100 g of CaCO3 to produce 56 g of CaO
Dissolving 10 g of NaCl in 100 g of water

Answers

Answer 1

Answer: Reacting 12 g of C with 32 g of O2 to form 44 g of CO2

Explanation: I took the test just now, and the law of conservation of mass means to energy and that is exactly what they do in this answer!  

Answer 2

Answer:

A

Explanation:


Related Questions

what are chiral carbon​

Answers

Answer:

A chiral carbon is a carbon bonded to four different groups ( four groups as carbon forms four bonds). The molecules formed are non superimposible on its mirror image.

the person who answered before me is correct!

Help plzzzz urgent !!!!!!!!!!!!!!

Answers

Answer: B < C < A

Explanation:

Ok so things that have the lowest pka are the strongest acids. the higher the pka the less acidic it is.

Match the term with the definition.

Condensation
Evaporation
Sublimation
Freezing

A) A phase change from a gas to a liquid
B) A phase change from a solid to a gas
C) A phase change from a liquid to a gas
D) A phase change from a liquid to a solid

[Please Hellp!]

Answers

Condensation goes with A.

Evaporation goes with C.

Sublimation goes with B.

Freezing goes with D.

Sea-Floor Spreading1. The arrows on the figure show the ocean floor spreading from the ridge. What are three kinds of evidence scientists have found to support this idea?
A. B. C.
I NEED HELP

Answers

Answer is

-B

Explanation

If 30cm³ of 0.45 mol dm3 HCl reacted with NaOH, how many moles of HCl reacted?​

Answers

Moles HCl reacted : 0.0135

Further explanation

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

[tex]\large {\boxed {\bold {M ~ = ~ \dfrac {n} {V}}}[/tex]

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

So to find the number of moles can be expressed as

n = V x M

The volume of HCl 30 cm³=3.10⁻² dm³

Molarity of HCl = 0.45 mol/dm³

so moles HCl reacted :

[tex]\tt n=3.10^{-2}\times 0.45=0.0135[/tex]

How many atoms of each element are in one molecule of 2-heptanone

Answers

Answer:

A chemical structure of a molecule includes the arrangement of atoms and the chemical bonds that hold the atoms together. The 2-HEPTANONE molecule contains a total of 21 bond(s) There are 7 non-H bond(s), 1 multiple bond(s), 4 rotatable bond(s), 1 double bond(s) and 1 ketone(s) (aliphatic).

Answer:

Explanation:

CH3 provides 1 Carbon

C4 provides 4 carbons

COC provides 2 more

Total 7 Carbons

======================

COCH3 Provides 1 Oxygen

======================

CH3 provides 3 Hydrogens

C4H8 provides 8 hydrogens

COCH3  has 3 more hydrogens

Total 14 hydrogens

The answer should be B.

You should note that there are no brackets which means you only need to read the small numbers going down behind each element. You might have to read that sentence a could of times, but it is important to know.

A unit of substance that contains the Avogadro number of atoms or molecules is referred to as a ____________ of the substance. ​

Answers

Answer:

A unit of substance that contains the Avogadro number of atoms or molecules is referred to as a mole of the substance.

Explanation:

The mole (symbol: mol) is the unit of measurement for amount of substance in the International System of Units (SI). A mole of a substance or a mole of particles is defined as exactly 6.02214076×1023 particles, which may be atoms, molecules, ions, or electrons. In short, for particles, 1 mol = 6.02214076×1023.

Classify each organic compound based on the functional group it contains.
ether
carboxylic acid
ester
alcohol
Molecular Structure
Type of Compound
I-O-I
Η Ο
1 10
C-C-0-H
1
H
H
-I
H
II
H
1
H-C
1
H
H
1
-C
1
H
1
H
1
H
1
H
H
I
H-C
1
H
H H
I
C-0-C-H
1
1
H H
1
H-CC-O-H
1
H H

Answers

Answer:

H2C2O1

Explanation:

Answer:

Carboxylic Acid

Ester

Ether

Alcohol

Explanation:

A 100g of sample of a compound is combusted in excess oxygen and the products are 2.492g of CO2 and 0.6495 of H2O. Determine the empirical formula of the compound?

Answers

The empirical formula : C₁₁O₁₄O₃

Further explanation

The assumption of the compound consists of C, H, and O

mass of C in CO₂ =

[tex]\tt \dfrac{12}{44}\times 2.492=0.680~g[/tex]

mass of H in H₂O =

[tex]\tt \dfrac{2.1}{18}\times 0.6495=0.072~g[/tex]

mass of O :

mass sample-(mass C + mass H)

[tex]\tt 1-(0.68+0.072)=0.248`g[/tex]

mol of  C :

[tex]\tt \dfrac{0.68}{12}=0.056[/tex]

mol of H :

[tex]\tt \dfrac{0.072}{1}=0.072[/tex]

mol of O :

[tex]\tt \dfrac{0.248}{16}=0.0155[/tex]

divide by 0.0155(the lowest ratio)

C : H : O ⇒

[tex]\tt \dfrac{0.056}{0.0155}\div \dfrac{0.072}{0.0155}\div \dfrac{0.0155}{0.0155}=3.6\div 4.6\div 1\\\\\dfrac{11}{3}\div \dfrac{14}{3}\div \dfrac{3}{3}=11:14:3[/tex]

Ernest Rutherford built on the work of previous scientists and improved the accuracy of the atomic model. What part of the atom is Rutherford
credited for discovering?
A.) The protons
B.) The electrons
C.) The nucleus
D.)The electron cloud

Answers

I think it’s A sorry if it’s wrong

Suggest whether water freezing is an endothermic or exothermic process. Can you explain your suggestion?​

Answers

It’s an exothermic process. Because let’s say when water molecules are in the liquid phase, they are constantly moving around, constantly bumping and collisind with each other.
heat must be given off by the system, i.e. the water, in order to slow everything down enough for the crystal to form.
As aresult, the freezing of water is an exothermic process because heat is being removed from the system.
An endothermic process would imply that heat must be supplied to the system. That is clearly not the case here, since providing heat would actually increase the average kinetic energy of the water molecules.

The breaking and forming of bonds between atoms in substances results in changes in the _______ contained in the substances.

Answers

Answer:

Electrons

Explanation:

The breaking and forming of bonds between atoms in substances results in changes in the number of electrons in the substance.

Atoms combined in order to share, gain or lose electrons for it to be stable. The noble gases have a set up configuration which makes them stable. All atom tend to mimic the noble gases.

how can air produce a pressure

IN OWN WORDS NOT FROM GOOGLE

Answers

Answer:

Gas pressure is caused when gas particles hit the wall of their contains. the more often the particles hit the walls, and the faster they are moving when they do this , the higher the pressure .

Explanation:

How many moles of
C
O
2
COX
2


will be produced from
97.0
g
97.0 g97, point, 0, start text, space, g, end text of
C
3
H
8
CX
3


HX
8


, assuming
O
2
OX
2


is available in excess?

Answers

Answer:

Im highy

Explanation:

Which atom in the following sets has the larger atomic radius?
a. Rn, Ne, Ar, Kr
b. Hg, Cs, Po, W
c. Mg, P, Al, Ar

Answers

Answer:

A.Rn,Ne,Ar,Kr.......

A 75.0 gram sample of water at 25.0 degrees Celsius is mixed with a 100. Gram sample of water at 60.0 degrees Celsius. What is the final temperature of the water?

Answers

Answer:

The final temperature of the water = 45°C

Explanation:

Heat lost = heat gained

Heat lost by water at 60°C = m₁CΔT₁

Heat gained by water at 25°C = m₂CΔT₂

where m₁ is mass of water at 60°C  = 100.0 g; m₂ is mass of water at 25°C = 75.0 g

C, specific heat capacity of water = 4.18 J/g°C

ΔT₁ = (60 - T); ΔT₂ = (T - 25); T = final temperature of the water

m₁CΔT₁ = m₂CΔT₂

100 * C * (60 - T) = 75 * C * (T - 25)

-100T + 6000 = 75T - 1875

-(100T + 75T) = -(6000 + 1875)

175T = 7875

T = 45°C

Therefore, final temperature of the water = 45°C

Carl makes the table below to determine the number of atoms of each element in the chemical formula 4Ca(ClO3)2.

A table with 3 columns and 2 rows. The first column labeled element has entries calcium, chlorine, oxygen. The second column labeled calculation has entries 1 times 4 , 1 times 2, 3 times 2. The third column labeled total atoms has entries 4, 2, 6.
What mistake did Carl make?

Answers

Answer:

calcium chloride oxide

Answer:

He did not multiply the chlorine and oxygen atoms by the coefficient 4

Explanation:

I just took the quiz

For this reaction, C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O, the ∆H is –2200 kJ. If two moles of C3H8(g) reacted with excess oxygen, what would be true?
A) 4400 kj of heat released into surroundings
B) 4400 kj of heat absorbed by system
C) 1100 kJ heat released into surroundings
D) 1100 kJ heat absorbed by system

Answers

A) 4400 kj of heat released into surroundings

Further explanation

Reaction

C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O, the ∆H is –2200 kJ

Reaction exothermic( ∆H=-, released heat to surrounding) and for combustion of 1 mole of C3H8

So for two moles of C3H8, the enthalpy :

[tex]\tt -2200\times 2=-4400~kJ[/tex]

Imagine you're cooking dinner for a few of your friends. You decide to make a salad with homemade dressing. Why do you need to think about the polarity of the different ingredients in your salad dressing in order for it to turn out well? Answer in 1 to 2 paragraphs. (10 points) Think about how polar molecules only mix with other polar molecules and nonpolar molecules only mix with other nonpolar molecules.

Answers

Answer:15

Explanation:

when molecules move they react by cooling down.
True or False?

Answers

Answer:

false

Explanation:

when molecules move they heat up

PLEASE HELP!!!!! NEED HELP ASAP!!!!!

Write the chemical formula for the ionic compounds below
EXAMPLE- Calcium Phosphide= Ca3P2

Magnesium chloride=
Aluminum Fluoride=
Lithium Bromide=
Potassium Sulfide=

Answers

Answer:

down below

Explanation:

MgCl2

AlF3

LiBr

K2S

From smallest to largest put these in order of their atomic radius Mg, Ba,
Sr, Ca
O Ca, Mg, Ba, S
O Ra, Sr, Ca, Mg
Mg, Ca, Sr, Ra
Mg, Sr, Ra, Ca

Answers

Answer:

b

Explanation:

i jus did it

An atom with which atomic diagram is most similar to calcium?

Answers

Answer:

C

Explanation:

Calcium is an element with a total of 20 electrons.

 It has 4 shells with a configuration of:

          2, 8, 8, 2

Option C is the most similar to calcium but the number of shells is not complete.

It still requires two more shells with 8 and two electrons respectively.

(10 POINTS PLS ANSWER IF U KNOW)
Is the coloring of the peppered moths an example of competition, differential reproductive success, or inherited variation? Explain why.

Answers

Answer:

Competition

Explanation:

Peppered moths get their color in lieu to become the fittest among all so that they can survive easily. During industrial age, when pollution suddenly became high these moths changed their color through evolution in order to save themselves from their predators.

PLS GIVE BRAINLIEST

Describe two physical properties of matter and how those properties are measured.

Answers

Answer:

Density, solubility, melting point, boiling point, polarity, etc.

Density - Mass divided by volume = density (scale and beaker can be used)

Boiling point- Can be determined by the capillary method (where an inverted capillary is put in the liquid you’re finding out for and the liquid is heated)

Question 12 of 25
Which sentence describes all atoms of one element?
O A. They have the same number of protons.
OB. They have the same number of neutrons.
O C. They have the same number of isotopes.
D. They have the same properties.

Answers

Answer:

D They have the same properties.

Explanation:

The same no. of isotopes doesnot describes because isotopes have same symbol but didderent atomic mass.

The _____________ is similar to a vacumn cleaner because it cleans up cell waste.

a
endoplasmic reticulum
b
lysosome
c
mitochondria
d
cell wall

Answers

Answer is:
B. Lysosome
B, because the lysosomes used chemicals to break down and worn out cell parts

Which of the following are soluble in water: salt, gravel, or pepper

Answers

i would say gravel but i’m not sure
gravel hope this helps!!!!!

The first atomic structure *
Yes
NO

Answers

Answer:

Yes? Sry I’m kinda confused

Explanation:

Sry if I’m wrong

Atoms and ions are all the same.

Answers

Answer:

Yes they are

Explanation:

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