Help, does anyone know this answer?

Answer:

1.38 moles

Explanation:

My teacher gave us the answer on a quiz so here if y’all want a explanation I’ll give y’all one tho

Answer:

Conduction

Explanation:

Answer:

To find out if a sample has baking soda we can add vinegar.

Explanation:

When vinegar (acetic acid) is mixed with salt (sodium bicarbonate), water, carbon dioxide and sodium acetate are formed. We see the formation of bubbles (which is carbon dioxide, which is a gas).

A stellar spectrum can reveal many properties of stars, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements.

Answer:

valence electrons are the electron in an outermost shell of an atom of an element (it is also called the outermost electron).

They are important for bonding because, when you bond two or more atom of an element, it is the outermost electron (valence electron) that will do the sharing of electrons when two atoms are bonded together.

Answer:

Theoretical yield = 40.8g

Explanation:

4Al + 3O2 ----] 2Al2O3

10.8g×102.0g/ 27.0g

theoretical yield = 40.8 g

Answer:

20.410 grams of Al2O3 are produced

Explanation:

First, we need to calculate the number of moles of aluminum that are actually reacting..

     We will convert from grams to moles using the atomic weight which (for aluminum) is 26.982 g/mol (which can also be rewritten as 1 mol/26.982)

10.8 g Al * 1 mol Al/26.982 g Al = 0.4002668446 moles Al

**Grams cancel out, so we are left with moles

(I would type this differently so that it would make more sense visually, however brainly is giving me errors, so try writing it out yourself if it doesn't initially make sense..put the equation in fraction form)

     Now that we have the moles of Al, we will convert from moles of Al reacting to moles of aluminum oxide produced..

To do this we will use the balanced chemical equation..

4Al + 3O2 -> 2Al2O3

Using the balanced chemical equation, we can see that for every 4 moles of aluminum that react, 2 moles of aluminum oxide are produced..

0.4002668446 moles Al * 2 mol Al2O3 / 4 mol Al

= 0.2001334223 moles Al2O3..

Now we need to convert from moles of Al2O3 to grams..

We can do this using the atomic weight of Al2O3..

The atomic weight of Al2O3 is 101.961 g/mol or 1 mol/101.961 grams

Now we will convert to grams of Al2O3...

0.2001334223 moles Al2O3 * 101.961 grams Al2O3/1 mol Al2O3

= 20.40580387..

20.410 grams of Al2O3 are produced

Answer:

1. Covalent bonds can form between two nonmetal atoms.

2. Covalent bonds can form between atoms of the same element.

3. Covalent bonds can form between atoms of different elements.

Explanation:

I hope this helps u! :D



Explanation:

Answer:

(d) Gases and water vapour

Explanation:

The atmosphere is a part of the Earth that contains predominantly gases or gaseous substances. In other words, the atmosphere is a combination of different gases, including water vapour.

Atmosphere is said to contain the following gases in the following proportion:

- Nitrogen (78%)

- Oxygen (21%)

- Argon (0.9%)

- Carbon dioxide (0.04%)

- Water vapour (1-4%)

Therefore, the Earth's atmosphere consists of many gases and water vapour.

Answer:

the answer is 2040

Explanation:

force is given as the product of mass and acceleration

Answer:

i am pretty sure the answer is a

Explanation: because the airplane's flight time has to be the independent variable for it to affect the dependent variable that is the speed of how fast the airplane is going.

Independent variables are test variables where we are testing its effects on the dependant variables. Here wind speed is the independent variable and time of flight is dependant variable.

Variables are values or components in an experiment which can be measured and will change by time. In an experiment there are two kinds of variables namely independant and dependant variables.

Dependant variables are those which changes with effect of independent variables. For example if we are studying the effect of water quality in the population of fish in  a pond. The independent variable is the quality of water and fish population is the dependent variable.

Here the time of flight depends on the wind speed. Thus, flight time is the dependant variable and wind speed is the test variable or independent variable.

To find more about variables, refer the link below:

https://brainly.com/question/17344045

#SPJ6

Answer:

Explanation:

magnet please give brainliest

Answer:

The three major phases of matter are Solid, Liquid, and Gas. But there is also Plasma

Answer:

2. Igneous rocks can weather, creating sediments that form sedimentary rocks

Explanation:

Sedimentary rocks are formed from Igneous rocks when rocks are broken down by weathering.

Answer:

Number of oxygen atom = 11

Explanation:

Given:

Table sugar C₁₂H₂₂O₁₁

In the given formula;

Number of carbon atom = 12

Number of hydrogen atom = 22

Number of oxygen atom = 11

Answer:2

Explanation:2w2222

Answer:

A - Ammonium Hydroxide (NH3)

Explanation:

• Metals are just too weak

• Calciums' have a low success rate

• Barium is good, but Ammonium is just stronger.

(This is just an opinion, I could definitely be wrong so just do corrections in class. Sorry)

Answer:

A

Explanation:

I think lol

Answer: It will become an anion. Anions are negatively charged molecules. So if the molecule is charged by electrons and electrons have a negative charge, it must form an anion.

Explanation:

Answer:

Muscles move body parts by contracting and then relaxing. Muscles can pull bones, but they can't push them back to the original position. So they work in pairs of flexors and extensors. The flexor contracts to bend a limb at a joint.

Explanation:

Hope it helps

Answer:

What is the investigation?

Explanation:

The volume of CO= 2.912 L

Given

Dehydration of 6 g of methanoic acid with H2SO4

Required

The volume of CO

Solution

Reaction

HCOOH  ⇒​  CO+H₂O

MW = 1.Ar C+2.Ar H+2.Ar O

MW = 1.12+2.1+2.16

MW= 46 g/mol

mol = mass : MW

mol = 6 g : 46 g/mol

mol = 0.13

From equation, mol ratio HCOOH  : CO, so mol CO = 0.13

Vm = 22.4 L

so for 0.13 mol :

= 0.13 x 22.4 L

= 2.912 L

Answer:

I am pretty sure it is the first one: Melting, cooling and hardening

Explanation:

igneous rocks are made of molten lava and then they cool down and harden  form into a rock. PLEASE correct me if i am wrong.

Answer:

V₂ = 0.74 L

Explanation:

Given data:

Initial volume of balloon = 0.75 L

Initial temperature of balloon = 27°C (27+273.15 K = 300.15 K)

Final volume of balloon = ?

Final temperature = 22°C (22+273.15 K = 295.15 k)

Solution:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

V₂ = V₁T₂/T₁  

V₂ = 0.75 L × 295.15 k / 300.15 K

V₂ = 221.36 L.K / 300.15 K

V₂ = 0.74 L

The given problem is solved through the Charles Law.

According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.

Mathematical expression:

V₁/T₁ = V₂/T₂

Answer:

hehe you might think im crazy but this answer makes no sEnSe

Explanation:

Answer:

590.2524g .

Explanation:

Answer:

0J

Explanation:

The potential energy of the sitting puppy is 0J.

Since we have been given the mass of the puppy to be 3kg, to find the potential energy, we use the expression below:

 Potential energy  = mgh

m is the mass

g is the acceleration due to gravity

h is the height

 So the puppy is sitting on the grass, the height is 0m

Therefore, Potential energy is 0J

_______________________________

If something is heretic, it refers to certain characteristics that is coded in our DNA. In science we know that this is possible through understanding the workings of the chromosomes & their functions.

_______________________________

Answer:

I have the image drawn, it'll be attached.

Explanation:

3 propyl hex-1-ene