Help please its science

Answer:

Carbon Dioxide?

Explanation:

When we take a breath, we pull air into our lungs that contains mostly nitrogen and oxygen. When we exhale, we breathe out mostly carbon dioxide.

Answer:Delta

Explanation:

Answer:

(It doesn't need to be m/s, but it's the most common unit. It's basically any unit of length divided by any unit of time)

hope this helps and good luck

Answer/Explanation:

Speed is a force and is solved by using acceleration.

You can use the problem to solve for force:

F= MA or Force equals mass times acceleration.

Answer:

e

Explanation:

it's in the index fossil range

Answer:

Explanation:

In marine strata, index fossils that are commonly used include the single-celled Protista with hard body parts and larger forms such as ammonoids. In terrestrial sediments of the Cenozoic Era, which began about 65.5 million years ago, mammals are widely used to date deposits.

Answer:

silver

Explanation:

The most electrically conductive element is silver, followed by copper and gold. Silver also has the highest thermal conductivity of any element and the highest light reflectance.

Answer:

A. copper

Explanation:

edge 2021

Explanation:

Not sure if ment like an electric type that gives off energy but here is my answer. a good conductor comes off handy in every situation. meaning, without one a machine, or whatever the conductor is being used for could be unstable, or not be able to work perfectly. which would could lead to certain malfunctions. so a good conductor could also give you a better chance of succeeding.

Answer:

B. Grilling a piece of meat

since the process involves burning

Answer:

molecule

Explanation:

A molecule is formed from two or more atoms

Explanation:

A delta is a process that forms by river deposition into an ocean or marine environment.

The element having 8 valence electrons and 4 energy levels is krypton, (Kr)  it is a noble gas included in 18th group.

Krypton is 36th element in periodic table with main shell electronic configuration, K= 2, L= 8, M= 18 and N= 8 where, K, L, M and N are energy levels.

Krypton is in the group noble gases also called inert gases. The group members of Kr are, Helium, argon and xenon. Thus krypton is the element with 4 energy levels and 8 valence electrons.

To know more about Kr, refer the link below:

https://brainly.com/question/14535867

#SPJ5

Answer:

There are 11 protons in an atom T.

Explanation:

In chemistry, the scientific word for proton is also known as atomic number so the proton number will be 11.

Answer:

11

Explanation:

Answer: C

Explanation:

There are 761.4 grams of CS2 in 10.00 mol.

To calculate the amount of grams present in a given amount of moles, the molar mass of the substance must be used, as follows:

                                        [tex]m = MM \times mol[/tex]

In this way, just perform the following operation:

                                          [tex]m = 76.14 \times 10[/tex]

                                         [tex]m = 761.4 grams[/tex]

Thus, there are 761.4 grams of CS2 in 10 mol of the substance.

Learn more about mole calculation in: brainly.com/question/15693285

The volume of the gas at STP = 35.01 L

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure).

In general, the gas equation can be written  

[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]

where  

P = pressure, atm  

V = volume, liter  

n = number of moles  

R = gas constant = 0.08206 L.atm / mol K  

T = temperature, Kelvin  

V=17.4 L

T = 23 + 273 = 296 K

P = 2.18 atm

[tex]\tt mol=n=\dfrac{PV}{RT}\\\\n=\dfrac{2.18\times 17.4}{0.082\times 296}\\\\n=1.563[/tex]

The volume of the gas occupy at STP :

[tex]\tt 1.563\times 22.4=35.01~L[/tex]

Answer:a negative charge

Explanation:

while an atom that gains electrons and becomes negatively charged is known as an anion.

Answer:

Tundra are cold bioms. They include poler bears wolfs rabbits etc

Explanation:

Answer:

Theoretical yield = 16.76 g

Percent yield = 87%

Explanation:

Given data:

Mass of iron oxide = 23.5 g

Theoretical yield of iron = ?

Actual yield of iron = 14.5 g

Percent yield of iron = ?

Solution:

Chemical equation:

2Fe₂O₃ + 3C     →  4Fe + 3CO₂

Number of moles of iron oxide:

Number of moles = mass/molar mass

Number of moles = 23.5 g/ 159.69 g/mol

Number of moles = 0.15 mol

Now we will compare the mole of iron oxide with iron metal.

                      Fe₂O₃         :            Fe

                         2              :              4

                      0.15            :          4/2×0.15 = 0.3

Mass of iron:

Mass = number of moles × molar mass

Mass = 0.3 mol × 55.85 g/mol

Mass = 16.76 g

Percent yield:

percent yield = (actual yield / theoretical yield)× 100

Percent yield = (14.5 g / 16.76 g) × 100

Percent yield = 0.87 × 100

Percent yield = 87%

Answer:

I tried the answer above and it’s correct

Explanation:

Answer:

Alpha particles, Beta particles, Gamma rays

Alpha Is the least harmful

Beta is second most harmful

Gamma is most dangerous

Explanation:

Answer:

Its D. Light energy to to electrical energy

Explanation:

Answer:

D. Light energy to electrical energy

Explanation:

its lowkey obvious lol

Answer:

Once you have identified the limiting reactant, you calculate how much of the other reactant it must have reacted with and subtract from the original amount.

Explanation:

 1.  Write the chemical equation.

   2.Calculate the moles of product from the first reactant.

   3.Calculate the moles of product from the second reactant.

   4.Identify the limiting reactant and the excess reactant.

   5.Calculate the mass of excess reactant used up.

   6.Calculate the mass of unused excess reactant.

   7.Calculate the mass of limiting reactant needed to react with the unused excess reactant.

Answer:

A

Explanation:

When Na atom chemically combine with with Cl atom to form NaCl both atoms loose their chemical properties due to the fact that Na atom transfer an electron to cl atom. after transfer of electron Na atom become Na ion (cation) and Cl atom become Cl ion (anion)

Answer:

2Mg (s) + CO₂ (g) → 2MgO (s) + C (s)

General Formulas and Concepts:

Chemistry - Reactions

Explanation:

Step 1: Define RxN

Mg (s) + CO₂ (g) → MgO (s) + C (s)

Step 2: Balance RxN

2Mg (s) + CO₂ (g) → 2MgO (s) + C (s)

Explanation:

When we have direct sunlight, the temperature is higher compared to indirect sunlight.

Direct sunlight is usually overhead whereas indirect sunlight is at an angle to the surface.

Answer:

132g/mol

Explanation:

Given compound:

   C₆H₁₂O₆

Molecular mass of the compound.

 This is the sum of the atomic masses of the given elements in the compound;

  C = 12

  H  = 12

  O = 6

Molecular mass = 6(12) + 12(1) + 6(16) = 180g/mol

Answer:

2×10⁻⁴

Explanation:

Given data:

2.8 ×10⁻⁶ + 1.4×10⁻²

Solution:

2.8 ×10⁻⁶ + 1.4×10⁻²

2×10⁻⁶⁺²

2×10⁻⁴

Scientific notation is the way to express the large value in short form.

The number in scientific notation have two parts.

. The digits (decimal point will place after first digit)

× 10 ( the power which put the decimal point where it should be)

for example the number 6324.4 in scientific notation will be written as = 6.3244 × 10³

The intial temperature : 59.865 °C

Heat added :

Q = m . c . ΔT

Q = heat, J  

m = mass, g  

c = specific heat, joules / g ° C  

∆T = temperature difference, ° C / K  

[tex]\tt 305=94.8\times 0.128\times (85-t_1)\\\\85-t_1=25.135\\\\t_1=59.865^oC[/tex]

Explanation:

The word BOOK; is made up of 4 letters and each actually represents the symbol of an element.

An element is a distinct substance that cannot be split-up into simpler substances.

  B    -   Boron

  O    - Oxygen

  O   - Oxygen

  K   - Potassium

We can see that the word BOOK shows us elements boron, oxygen, oxygen and potassium.