I NEED HELP WITH THIS ASAP!!!!!!!!!!!!!

Which chemical equation best represents the Law of Conservation of
Mass?
A. H+0 -> H20
B. H2 + 02 --> H20
C. 2H2 + 02 --> 2H,0
D. H2 + 02 --> 2H,02

Answers

Answer 1

Answer: The answer is B

Explanation:


Related Questions

Which type of fault is under compression? A. Normal. B. Thrust. C. Transform. D. Strike-slip

Answers

Answer:

The answer is Thrust

During a scientific investigation, which step will a scientist perform first?

Answers

Answer:

you need to have a question or a problem first

What are some of the regulations about cell phone waste?


Are the regulations the same everywhere, which countries have different regulations?


New technology to reduce waste?


Pls and thank you!

Answers

What are some of the regulations about cell phone waste?

In general, companies take part in the responsibility of taking back the e-waste resulted from their products.

Are the regulations the same everywhere, which countries have different regulations?

In 2005, two important directives were published in the European Union. The first stipulates that: 1) all manufacturers selling electrical and electronic equipment in and to EU countries label the equipment to inform customers that it must be recycled and 2) make sure that their products are properly disposed of or recycled after the life cycle. The second requires manufacturers to eliminate or minimize the use of lead, mercury, hexavalent chromium, cadmium, polychrome and diphelin biphenyl ethers in electrical and electronic equipment sold in the EU after 1 July 2006.

New technology to reduce waste?

Companies are trying to reduce the amount of resources needed in order to create their products. One alternative is the modular smarthphones, which aims to reduce the amount of e-waste of the phone by only upgrading a few elements of hardware.

Convert the following to Celsius
6) 32°F
7) 45°F
8) 70°F
9) 80° F
10) 90° F
11) 212°F

Answers

9. (80-32)5/9

48×5/9

240/9

26.66°C

9. (90-32)5/9

58×5/9

32.22°C

10 (212-32)5/9

180×5/9

20×5

100°C

which of the following lists contains only elements?
A ) air , water,oxygen
b) hydrogen, oxygen, brass
c) air , fire , water, earth
d) calcium, sulphur, carbon

Answers

C. air, fire, water, earth. 4 elements

Why don’t all salts make a one-to-one ratio?

Answers

Answer:

because all types of salts are made up of different substrances

All salts do not make a one-to-one ratio because the salts are composed of different ions that combine together in different ratios.

A salt is an ionic substance. Salts are formed by combination of a cation and and anion.

Different salts are comprised of different ions. The ratios in which the ions combine in each salt is not the same.

Hence, all salts do not make a one-to-one ratio because the salts are composed of different ions that combine together in different ratios.

Learn more: https://brainly.com/question/5110211

How many fluorine atoms are present in 6.30 g of C2F4

Answers

Fluorine atoms = 1.517 x 10²³

Further explanation

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

[tex]\large{\boxed{\boxed{\bold{mol=\frac{mass}{molar\:mass}}}}[/tex]

Proust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements

Mass of F

[tex]\tt mass~F=\dfrac{4.Ar~F}{MW~C_2F_4}\times mass~C_2F_4\\\\mass~F=\dfrac{4.19}{100}\times 6.3=4.788~gr[/tex]

mol of F

[tex]\tt =\dfrac{4.788}{19}=0.252[/tex]

number of Fluorine atoms

[tex]\tt 0.252\times 6.02\times 10^{23}=1.517\times 10^{23}[/tex]

The atomic mass of an atom is calculated by adding up what two subatomic particles

Answers

The atomic mass of an atom is calculated by adding up protons and neutrons

Further explanation

There are two components that accompany an element, the mass number and atomic number

Atoms are composed of 3 types of basic particles (subatomic particles): protons, electrons, and neutrons

The charge of 1 proton is equal to a charge of 1 electron but has a different sign

The proton is positively charged (+1), the electron is negatively charged (-1). and neutrons not charged (neutral)

The Atomic Number (Z) indicates the number of protons and electrons in an atom of an element.

Atomic number = number of protons = number of electrons ⇒ neutral number

Atomic mass is the sum of protons and neutrons

Atomic Number (Z) = Atomic mass (A) - Number of Neutrons

What is the charge of protons?

Answers

Answer:

protons naturally have the charge of +1

Answer:Protons have a positive electrical charge of one (+1) and a mass of 1 atomic mass unit (amu), which is about 1.67×10−27 kilograms

Explanation:

What kind of reaction happens when two compounds switch elements? Apex

Answers

Answer:

A replacement reaction occurs when elements switch places in compounds. This type of reaction involves ions. Generally, more reactive elements replace less reactive elements. A single replacement reaction occurs when one element replaces another element in one compound.

Explanation:

Just figured it out!

Answer: a double - replacement reaction

Explanation:

I just got it right on Apex

Write 657000 in scientific notation.

Answers

Answer:

600000+50000+7000

Explanation:

Which chemical equation best represents the Law of Conservation of
Mass?
O H+ 0 -> H20
H2 + 02 --> H20
2H2 + O2 --> 2H20
H2 + O2 --> 2H,02

Answers

2H₂ + O₂ ⇒ 2H₂O

Further explanation

Conservation of mass states that

In a closed system, the masses before and after the reaction are the same

So it can be concluded

mass of the reactants = mass of the productsmass cannot be created or destroyedThe number of atoms involved in a reaction remains the same⇒ number of moles also the samechemical equation in balanced form

So let's see which of the several options , which one has the same number of atoms on both sides of the equation

2H₂ + O₂ ⇒ 2H₂O

H ⇒ left 4, right 4

O ⇒ left 2, right 2

so the equation is in balance and represents the Law of Conservation of

Mass

Structural differences between different chemicals can be represented in models of the particles. Which drawing best represents a compound?

Answers

Answer:

this is about that.

Answer:

C.

Explanation:

Which of the following electromagnetic waves has the most energy on the electromagnetic spectrum?
O A Infrared
O B. X-ray
O C. Gamma
O D. Radio

Answers

Answer:

Gamma rays

Explanation:

The waves with higher frequencies will have higher energies and gamma waves have the highest frequencies on electromagnetic scale ,because of this reason gamma waves is the answer.


Convert the following to Kelvin
12) 0° C
13) -50° C
14) 90° C
15) -20° C

Answers

Answer:

12)273.15 kelvin

13)223.15 kelvin

14)363.15 kelvin

15)253.15 kelvin

Explanation:

thank u!!!

Answer:

12) 273.15

13) 223.15

14) 363.15

15) 253.15

Explanation:

Formula:

_C+273.15=_K

i need help Which of the following shows the correct order in which organs take part in the process of digestion

Answers

Answer:

Mouth

Esophagus

Stomach

The small intestine

Colon (large intestine)

Rectum

Pls fill in the blank

Because it can either lose or share electrons when it combines with has some of the properties of metals and
other elements, each has some of the properties of nonmetals.

A. Metalloids

B. Sodium

C. Gold

Answers

A. Metalloids

They can either lose an electron or share an electron when it combines with other elements. They have some properties of metals and some properties of non-metals.

Which of the following is NOT an example of a homogeneous mixture? a oxygen b tea c water d pizza

Answers

pizza because the ingredients arent mixed together completely. you can clearly see the different ingredients as compared to the others

I NEED HELP ASAP!!
Scientific Inquiry

Science is the investigation of the ______________ ________________. Biology is the branch of science that studies ___________ _______________ and the environments they live in.

The Scientific Method

The scientific method is a __________________ used during a scientific ____________________ to answer a scientific question.
• Qualitative data is something that can’t be
________________ but can change over time.
Scientific inquiry can’t answer questions about a person’s beliefs, ethics, _________________, and feelings.

Which of these are questions that science can answer?

A. Was the flu vaccine more effective this year than last year?
B. Is it ethical to use stem cells in human research?
C. Does a drop in temperature affect the number of offspring that frogs produce?
D. Will people feel better if they eat organic produce instead of conventionally grown produce?
E. Are coffee drinkers worried about their heart disease risk?

Construct Hypotheses and Predictions
A hypothesis is a plausible __________________ for a particular fact. The hypothesis needs to be ____________________ or ____________________ based on collected evidence. All studies must have at least one hypothesis.

Answers

Answer:

Science is the investigation of the ______________ ________________. Biology is the branch of science that studies living organisms and the environments they live in.

The scientific method is a tool used during a scientific investigation to answer a scientific question.

• Qualitative data is something that can’t be

collected but can change over time.

Scientific inquiry can’t answer questions about a person’s beliefs, ethics, values, and feelings.

im going to say d

Construct Hypotheses and Predictions

A hypothesis is a plausible guess for a particular fact. The hypothesis needs to be supported or refuted (proven wrong) based on collected evidence. All studies must have at least one hypothesis.

Could someone answer this for me?

Answers

A is the answer as they both are solid at room temp.

Answer:

B

Explanation:

15
The correct formula for a compound formed from the elements Al and O is
a. AIO.
b. Al2O.
c. Al3O2-
d. AIO3.
e. Al2O3.

Answers

a.) AlO is the correct formula

Pleaseee help ASAP
will mark brainliest!!! <3

Answers

The answer is A because Fluorine has 7 atoms in its valence shell.

Answer:

Fluorine belongs to the group 7 A so it must have 7 electrons in the oribits so the answer would be A as u count the electrons in the orbits, There are exactly 7 electron

Explanation:

I just need an answer for question 3,4 and 5. thank you so much. ​

Answers

Number 3,In 1913,Neils Bohr,a student of Rutherford’s developed a new model of the atom.number 5,the chemical elements are arranged in order of increasing atomic number.elements in the same group have similar chemical properties. Hope this helps!

If a can of soup 150 g mass and 0.75g/ cm^3 density what’s the volume

Answers

Answer:

The answer is 200 cm³

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density}\\[/tex]

From the question

mass = 150 g

density = 0.75 g/cm³

We have

[tex]volume = \frac{150}{0.75} \\ [/tex]

We have the final answer as

200 cm³

Hope this helps you

i need help ' please

Answers

Answer:

s orbitals - spherical shape

p orbitals - dumbbell shape

d orbitals- dxy, dyz , dzx -double dumbbell

- dx²-y²- double dumbbell (along axis)

-dz² -dumbbell with electron cloud

( along the axis)

therefore here the answer is 2s and 3s

The most important ELEMENT found in all living things is


A. Oxygen

B. hydrogen

C. Nitrogen

D. Carbon

Answers

Answer:

A. Carbon hope this helps

Answer:

D. Carbon. I guess that's the answer

The solution starts with increased ________________

Answers

Answer:

Concentration

Explanation:

Answer:

concintracion

Explanation:

what are the strengths and weaknesses of the Mendeleev periodic table?

Answers

Answer:

Advantages:

1. Grouping of elements. He generalized the study of the elements then known to a study of mere 8 groups.

2. Gaps for undiscovered elements. Mendeleev left some gaps in his periodic table. These gaps were left for subsequent inclusion of elements not known at that time. He correctly thought that such elements would be discovered later.

3. Prediction of properties of undiscovered elements. He predicted the properties of then unknown elements om the basis of properties of elements lying adjacent to the vacant slots.

4. Incorrect masses corrected. He was able to correct the values of atomic mass of elements like gold and platinum by placing these elements strictly on the bases of similarities in their properties.

Disadvantages:

1. Anomalous pairs: Argon with atomic mass 39.9 precedes potassium with atomic mass 39.1.

Cobalt with atomic mass 58.9 precedes nickel with atomic mass 58.6.

Tellurium with atomic mass 127.6 precedes iodine with atomic mass 126.9.

2. Position of isotopes: According to Mendeleev's periodic law, isotopes of an element must be given separate places in the periodic table since they have different atomic masses. But they were not assigned separate places.

3.Grouping of chemically dissimilar elements: Elements such as copper and silver bear no resemblance to alkali metals but they have placed in separate groups.

4.Separation of chemically similar elements: Elements that are chemically similar, such as gold and platinum have been placed in separate groups.

5.Electron arrangement: It does not explain the electron arrangement of elements.

6. Position of Hydrogen: It was not given in a fixed position.Explanation:

The Mendeleev periodic table has strengths in its predictive power, organization of elements, and observation of periodic trends. However, it has weaknesses in incomplete representation, limited understanding of atomic structure, and challenges in placing rare earth elements.

The Mendeleev periodic table, developed by Dmitri Mendeleev in the 19th century, laid the foundation for the modern periodic table. It has several strengths and weaknesses, which are outlined below:

Strengths of the Mendeleev periodic table:

Predictive Power: One of the major strengths of the Mendeleev periodic table is its ability to predict the existence and properties of yet-to-be-discovered elements. Mendeleev left gaps in the periodic table, accurately predicting the properties of elements that were later discovered and filled in those positions.

Periodic Trends: The Mendeleev periodic table organizes elements in a way that allows for the observation of periodic trends. Elements within the same group (vertical column) exhibit similar chemical properties and have similar valence electron configurations. This periodicity helps in understanding the behavior and reactivity of elements.

Classification of Elements: The Mendeleev periodic table classifies elements based on their atomic number and chemical properties. It provides a systematic arrangement of elements, allowing scientists to organize and study them more efficiently.

Weaknesses of the Mendeleev periodic table:

Incomplete Representation: The Mendeleev periodic table, when initially proposed, had gaps for undiscovered elements. While Mendeleev made accurate predictions, some of the gaps were filled in later with elements that did not necessarily match the properties initially predicted. This incomplete representation can be seen as a weakness.

Limited Understanding of Atomic Structure: At the time of Mendeleev's development of the periodic table, the understanding of atomic structure was incomplete. The periodic table was based on elemental properties without the knowledge of atomic numbers or the electron configuration of elements. This limitation hindered the ability to explain certain observed trends and properties accurately.

Lack of Internal Structure: The Mendeleev periodic table did not provide a detailed understanding of the internal structure of atoms or the arrangement of electrons in energy levels. It primarily focused on organizing elements based on their chemical properties and atomic weights, lacking the underlying atomic structure information.

Rare Earth Element Placement: Mendeleev faced challenges in placing the rare earth elements in the periodic table. Initially, he grouped them together as a separate series, but later refinements led to the placement of the rare earth elements within the main body of the table. The difficulty in organizing these elements reflects a weakness in the early understanding of their properties and arrangement.

Learn more about Mendeleev periodic table from the link given below.

https://brainly.com/question/11974961

#SPJ2

This is a property of matter that can be identified without changing the identity of the substance
PLEASE ANSWER QUICKLY!

Answers

Answer:

hkile uo gihme rapre

Explanation:

what is the mass of 4.900 x 10^25 atoms of He

Answers

mass?atoms=4.900x10,25,of helium               mass=atoms x molarmass divided by NA [6.022x1023] we will get or answer                                                                  
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