Chemistry High School

Which statement describes how chemical formulas, such as H2O, represent compounds?

They show the types of molecules that make up an atom.
They show the elements that make up a compound.
They show the three-dimensional shape of a molecule.
They show the types of bonds that exist between elements.

Answers

Answer 1

Answer:  B. They show the elements that make up a compound

Explanation:

Which Statement Describes How Chemical Formulas, Such As H2O, Represent Compounds?They Show The Types
Answer 2

Answer:

B

Explanation:

Related Questions

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.

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:

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.

what percent of a sample of a radioactive element whose half life=5.0 years will decay after 25 years?

Answers

Answer:

Calculate the rate of decay constant for U-238 if its half-life is 4.468 × 109 years. Answer: If the problem is referring to the half-life, then the ratio of = 0.5 because half of the original sample has already undergone decay.

Explanation:

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)

Which molecule has the strongest forces of attraction between molecules?

Answers

Dipole-dipole interactions are the strongest intermolecular pressure of attraction.

Answer: Dipole-dipole interactions are the strongest intermolecular force of attraction.

Explanation:

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: 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:

A

Explanation:

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.


Predict the products for the following chemical reaction: H2 + O2 →
a. H30
b. H20
c. H2OH
d. OH + OH
O a

Answers

The answer is C I got it right so hope it helped ;)

please someone help me its due today thanks :D

Answers

Answer:

D

Explanation:

All of the above are great examples!

"Endothermic reactions are those which absorb heat during the reaction."

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:

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.......

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!

What is one danger associated with the use of hydrogen gas

Answers

Answer:

Topping the list of concerns is hydrogen burns. In the presence of an oxidizer -- oxygen is a good one -- hydrogen can catch fire, sometimes explosively, and it burns more easily than gasoline does.

Answer:

hydrogen burns

hope it helps

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

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.

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

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

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]

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.

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

which element has a higher atomic number of aluminum or oxygen

Answers

Answer:

aluminum

Explanation:

oxygen's atomic number is 8.

aluminum's atomic number is 13.

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

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!!!!!

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

Atoms and ions are all the same.

Answers

Answer:

Yes they are

Explanation:

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

Is copper sulphate malleable?

Answers

Answer:

Yes, Copper (Cu) in its pure form is a reddish-brown metallic element with high ductility and malleability that is an excellent conductor of heat and electricity: atomic weight 63.54; atomic number 29; density 8.94 g/cm3; melting point 1083°C; and boiling point 2595°C.

Answer:

no ,its not malleable

Explanation:

copper II sulphate is a blue compound , which is brittle solid , crystalline .

copper metal is malleable and ductile

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:

HELPP!!! ASAP!!!! BRAINLIEST!!!


Complete the following sentences. Energy is required to _______ bonds in a molecule and released when bonds are _______.

Answers

Answer:

Energy is required to break bonds in a molecule and released when bonds are made.

Explanation:

Energy is added to break bonds and released when making bonds.

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