Chemistry High School

All types of sciences use the same steps of the scientific method.

True

False

Answers

Answer 1
False hope this helps
Answer 2
False because they ask and perform different tests and questions

Related Questions

2. What is the molarity of a CuBr2 solution that contains 446 g of solute in 5000 mL of solution?

Answers

Answer:

0.4 M

Explanation:

M=moles/Liters

Convert grams to moles (446/223.37=1.99668711)

Convert 5000 mL to liters (5000/1000)

Plug in the values and solve

M=2/5

M=0.4

What must be done to calculate the enthalpy of reaction? Check all that apply. The first equation must be halved. The first equation must be reversed. The second equation must be halved. The second equation must be reversed. The third equation must be halved. The third equation must be reversed. What is the overall enthalpy of reaction? Delta.Hrxn = kJ

Answers

The overall enthalpy of the reaction has been obtained by reversing the second equation, and third equation must be halved. Thus, option D and E has been correct.

The complete reactions given in the question has been:

[tex]\rm C\;+\;O_2\;\rightarrow\;CO_2\\2\;CO\;+\;O_2\;\rightarrow\;2\;CO_2\\2\;H_2O\rightarrow\;2\;H_2\;+\;O_2[/tex]

The overall reaction has been:

[tex]\rm C\;+\;H_2O\;\rightarrow\;CO\;+\;H_2[/tex]

To obtain the overall enthalpy of the reaction, the intermediate reaction enthalpy has been arranged to give the overall equation.

The first equation has been in the correct sequence for the final reaction.

The second equation has been in in the same order to obtain the overall reaction. The CO has been the product, while carbon dioxide has been the reactant from equation 1. Thus, equation 2 has been reversed.

The third equation has 2 moles of water while the overall reaction has 1 mole of water. Thus, equation third has been halved.

Thus, to obtain the enthalpy of overall final reaction, the second equation must be reversed, and third equation must be halved. Thus, option D and E has been correct.

For more information about the enthalpy of reaction, refer to the link:

https://brainly.com/question/1657608

Answer:

What must be done to calculate the enthalpy of reaction? Check all that apply.

The first equation must be halved.

The first equation must be reversed.

The second equation must be halved.

✔️ The second equation must be reversed.✔️ The third equation must be halved.  ✔️ The third equation must be reversed.

What is the overall enthalpy of reaction?

ΔH[tex]rxn[/tex]= ✔️131.3 kJ

responsible for bring messages from the sensory
organs to the brain. ?
A: Skeletal
B: Sensory
C: Motor
D: Axial

Answers

Answer:

motor nerves

Explanation:

sensory produces while motor transports

plzzzzzzzzzzzzz help me

Answers

Answer: omnivores

Explanation:

I just know

Why do scientific experiments need to be repeated?

A. Because scientists often make mistakes

B. To ensure that the same results are achieved every time

C. They only need to be repeated if the results are questionable

D. To discourage other scientists from trying to get the same results

Answers

Answer:

B

Explanation:

this is called peer review and your results will be stronger

The shade or pigment of a mineral is known as
Luster
Hardness
Density
Streak
O Color

Answers

Answer:

Streak

Explanation:

The streak of a mineral is the color of the powder produced when it is dragged across an un-weathered surface.

the answer is 4. Streak

The speed of chemical weathering depends on:


water freezing

amount of wind

soil depth

Answers

I think weather freezing if not tell me I think I know

Answer:

Its soil depth

Explanation:

What is the electron configuration for an Atom that has 13 electrons

Answers

In order to write the Aluminium electron configuration we first need to know the number of electrons for the Al atom (there are 13 electrons). When we write the configuration we'll put all 13 electrons in orbitals around the nucleus of the Aluminium atom.

Na * 6.02 * 10^23 pls help an it got to include na

Answers

Answer:

6.02E23Na

Explanation:

you just convert the element to a decimal form

PLEASE HELP WILL MARK BRAINLY
1. If a cube has 2cm sides and a mass of 10 g, what would it's density be?
A. 0.8 g/cm3
B. 1.25 kg
C. 1.25g/cm3
D. None of the above

2.If a cube has sides of 1.5 cm, and a mass of 15 g, would it float or sink in water?
A. float
B. Sink

3. A material with a melting point of 25C would be a solid at 15C?
A. True
B. False

4. A material with a Chemical Symbol of CO is an element.
A. True
B. False

Answers

Answer:magine 2 cubes. ... One cube is made out of gold and has a mass of 19.3 grams. ... Gold has a density of 19.3 grams per cubic centimeter, that is, 19.3 g/cm3 or 19.3 g cm-3 ... If you weigh 1.00 mL of liquid water it will have a mass of about 1 g so its ... They are both less dense than water so they will also float on top of water .

Explanation:

plzzzzzzzzzz help ASAP

Answers

Answer:

i think the answer is c because it says that is all they care

CHAPTER
CHAPTER ASSESSMENT
Understanding Main Ideas (Part A)
In the space at the left, write true if the statement is true; if the statement is false,
change the italicized term to make it true.
1. The overall charge of a formula unit for a compound is never zero.
2. In a crystal lattice, each positive ion is surrounded by negative ions.
3. Delocalized valence electrons are typical of ionic compounds.
4. A sulfate ion contains fewer oxygen atoms than a sulfite ion does.
true
5. Metals tend to be malleable and ductile and to have relatively high
melting points.
6. The more negative the lattice energy is, the stronger is the force of
attraction between the ions of an ionic compound.
7. In naming ionic compounds, the cation is named first.
8. When a metal reacts with a nonmetal, the metal tends to gain electrons.
9. In naming a monatomic anion, the suffix -ide is used.
10. The prefix per- is used in naming the anion with the most oxygen atoms.

Answers

Answer:

The answer is in correct

Ca+Cl2-->CaCl2 Then, write balanced half-reactions describing the oxidation and reduction that happen in this reaction.

Answers

Answer:

Oxidation half

Ca -----> Ca2+ +2elecyrons

Reduction half

Cl2 + 2electrons ------> 2Cl-

Explanation:

Explain the function of the nucleus, nucleolus, nuclear membrane, chromosomes, ribosomes, cytoplasm, cell membrane, mitochondria, Golgi complex, vacuole, endoplasmic reticulum, cell wall, chloroplast

Answers

nucleus - controls and regulates the activities of the cell
nucleolus - producing and assembling the cells ribosome
nuclear membrane - separate the chromosomes from the rest of the cell
chromosomes - carries genetic information from one generation to another
ribosome - making proteins
cytoplasm - responsible for holding the components of the cell and protects them from damage, stores the molecules required for cellular processes and is also responsible for giving the cell its shape
cell membrane - provides protection for a cell, transport nutrients into the cell and also to transport toxic substances out of the cell
mitochondria - membrane-bound cell organelles that generate most of the chemical energy needed to power the cells biochemical reactions
Golgi complex - responsible for transporting, modifying, and packaging proteins and lipids into vesicles for delivery to targeted destinations
vacuole - (animal cells - help sequester waste products ) ( plant cells - help maintain water balance)
endoplasmic reticulum- produce proteins for the rest of the cell to function
cell wall - surrounds the plasma membrane of the plant cells and provides tensile strength and protection against mechanical and osmotic stress
chloroplast - allow plants to capture the energy of the sun in energy-rich molecules

Fe(OH)2+HCI--> FeCl2+H2O balanced​

Answers

Answer:

Fe(OH)2 + 2HCl ---> FeCl2 + 2H2O

I think

HELP ME.
Convert 2.5 grams of water into molecules of water.

Answers

Answer:

1.5×1024 molecules

Good luck!

37 grams of H3PO4 ????

Answers

Answer:

76 grams is the correct answer to this question

If 9.87g of As2O3 reacts with carbon, then 7.71g of As should be produced. If only 6.33g of As is actually produced, what is the percent yield of As?
a 82.1%
b 0.821%
c 64.1%
d 0.641 %

Answers

Answer:

A

Explanation:

Percent yield= Actual yield/Theoretical yield x 100

The problem tells you that 6.33g of As is produced (actual yield), but 7.71g should be produced (theoretical yield). So 6.33/7.71= 0.821 x 100= 82.1%

Answer:

82.1%

Explanation:

A. I got it right on my test

Help me!!
Question 5 only!

Answers

Oxygen photosentics

The atoms in a sample are close together but can side past one another. As the atoms lose energy, they move slower. The atoms become locked in place because of attractive forces between them.

Which change of state is taking place

Gas to solid
Gas to liquid
Liquid to solid
Solid to liquid

Answers

Answer: Liquid to solid

Which of the following is an example of a chemical element a. Salt B.water c.sugar d.sodium

Answers

Answer:

the answer is sodium

Explanation:

hope this helps

yes sir , the answer should be sodium

What information is needed to determine a molecular formula

Answers

Answer:

Empirical formulas can be determined from the percent composition of a compound. In order to determine its molecular formula, it is necessary to know the molar mass of the compound. Chemists use an instrument called a mass spectrometer to determine the molar mass of compounds.

Answer:

The empirical formula and the molar mass.

Explanation:

AP3X

why do the properties of a material determine the use of the material?

Answers

Answer:

Matter is made up of particles whose properties determine the observable characteristics of matter and its reactivity.

Explanation:

Look at the diagram below.
(+
When this atom becomes an ion, it will
(gain, lose)
electrons. The charge of this ion will be

Answers

Answer:

gain electrons

charge will be 4-

What is white light made up of?
A. infrared light
B. ultraviolet light
C. seven colors of the rainbow

Answers

Answer:

The answer is C

Explanation:

hope this helps

:)

Answer:

C. Seven colors of the rainbow

Explanation:

when light enters a water droplet and then leaves it again, each different wavelength of light refracts at a slightly different angle. then, when the light is broken up, you can see all of the colors of the rainbow.

For Example, A Dark Tinted Window.

What is the relationship of rocks to minerals.

Rocks are minerals.
Minerals are rocks
Minerals are in rocks.
Rocks are in minerals.

Answers

Rocks are made up of minerals

Minerals are in rocks.

1 point
If the element Lithium (Li) were to bond with the element Sulfur (s), what
type of bond can you predict will be formed and why?*
A. Covalent-Li and S are two nonmetals
B. Covalent-Li is a metal and S is a nonmetal
C. Ionic-Li and S are two nonmetals
D. Ionic-Li is a metal and S is a nonmetal

Answers

Answer:

C. Ionic-Li and S are two nonmetals

48g of methane was burned in an excess of air. What mass of carbon dioxide would be produced in the reaction assuming complete combustion? Use the information below to answer the question.

Answers

Answer:

132g

Explanation:

CH4= 12+4=16  

moles= m/Mr    moles=48/16=3 mol

CO2= Mr=44

there are the same number of moles as methane:

Mass= Mrxmoles

44x3=132g

The mass of the carbon dioxide produced by the combustion of the 48 g of methane is equal to 132 g.

What is the combustion reaction?

Combustion reaction involves the complete oxidation of the hydrocarbon such reactions generally release only carbon dioxide and water as products.

A hydrocarbon undergoes combustion to produce carbon dioxide and water as the product. No other side products are formed in the combustion reaction.

The given combustion reaction of the methane can be written as follows:

CH₄   + 2 O₂ →  CO₂  +  2H₂O

Given the amount of methane for combustion = 48 g

The molar mass of methane = 16g/mol

The molar mass of the carbon dioxide, CO₂ = 44g/mol

16 grams of methane produce carbon dioxide = 44g

The  48 grams of methane will produce CO₂ = (44/16) ×48 = 132 g

Therefore, the mass of 132 g of carbon dioxide is produced by the combustion of 48g of methane.

Learn more about combustion reactions, here:

brainly.com/question/12172040

#SPJ2

Dominant genes are represented with lowercase letters while recessive genes are represented with capital letters.
1. True
2.False

Answers

Answer:

True

Explanation:

False ...i hopefully it’s correct

Which unit is used for measuring atomic mass?

Answers

Answer: Amu

Explanation:

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