40 g of CaCO3 is how many moles of CaCO3?
10 moles
0.4 moles
40 moles
100 moles

Answer:

Lithium, sodium, potassium, rubidium, and cesium are all part of a group called the alkali metals. ... They are all soft metals in elemental form and they all react violently with water. They react so strongly because they all readily lose an electron to form the +1 cation very easily.

Answer:

Explanation:

Scientific theory is an in-depth explanation of the observed phenomenon. A law is a statement about an observed phenomenon or a unifying concept.

Answer:

Molecular Mass

Explanation:

It's asking for the numerical quantity. That quantity would be the Molecular Mass. Take the sample mass and divide it by the molecular mass to get the number of moles.

(14g N * 2) + (1g H *4) = 32g / mol of N2H4

To get # of moles, divide the sample mass by the molecular mass

25g / 32g = 0.78125 moles

Answer:

1. Mass of the blue ball is 5 kg.

2. Mass of the red ball is 3.75 kg.

Explanation:

The following data were obtained from the question:

For the blue ball:

Force (F) = 15 N

Acceleration (a) = 3 m/s²

Mass (m) =.?

Force the red ball:

Force (F) = the same with that of the blue ball = 15 N

Acceleration (a) = 4 m/s²

Mass (m) =.?

1. Determination of the mass of the blue ball.

Force (F) = 15 N

Acceleration (a) = 3 m/s²

Mass (m) =.?

Force (F) = mass (m) × acceleration (a)

F = ma

15 = m × 3

Divide both side by 3

m = 15/3

m = 5 kg

Therefore, the mass of the blue ball is 5 kg

2. Determination of the mass of the red ball.

Force (F) = 15 N

Acceleration (a) = 4 m/s²

Mass (m) =.?

Force (F) = mass (m) × acceleration (a)

F = ma

15 = m × 4

Divide both side by 4

m = 15/4

m = 3.75 kg

Therefore, the mass of the blue ball is 3.75 kg

Answer:

C

Explanation:

I had the same answer during school and the teacher said it was correct but if it isnt I'm super sorry

A lion preying  on a herd of gazelle is not an example of how biotic factors interact with abiotic factors in an ecosystem.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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Answer:

Explanation:

Answer:

find how much gold weighs by volume based on the karat and factor that in to find the answer  

Explanation:

Answer:

For drinking.

For cleaning dishes.

For cooking.

for watering plants.

for washing clothes.

for bathing.

for generation of hydroelectricity.

for washing car.

making our dog bath

it helps in maintaining osmotic rate in humans

Explanation:

Hope this helps u

Crown me as brainliest

Answer:

drinking,washing clothes ,washing dishes ,cooking,watering plants,cleaning ,for generation of hydroelectricity,washing vehicles,aquatic life,bathing

Explanation:

follow me pls.

Answer:

6. 53 is the answer. Hope this helps:)

The number of d electrons that an atom of atomic number 53 possess are 20. Thus, the correct option for this question is 5.

An atomic number may be defined as the number of protons in the nucleus of an atom that significantly represents the characteristic of a chemical element and determines its specific place in the modern periodic table.

According to the modern periodic table, an element that has an atomic number of 53 is known as Iodine. Its electronic configuration is [tex]1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^2, 3d^1^0, 4p^6, 5s^2, 4d^1^0, 5p^5[/tex]. Thus, according to this electronic configuration, the total number of d electrons are [tex]3d^1^0 and 4d^1^0[/tex].

Therefore, the number of d electrons that an atom of atomic number 53 possess are 20. Thus, the correct option for this question is 5.

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Answer:

23 because the atomic number is base on protons and electrons and the neutrons is 20 hope it help

Answer:

B) atom of Xenon

Explanation:

Xenon is already stable alone, because it has a complete octet, or 8 electrons. This graph is not an ion because it shows xenon is its default state, consisting of 8 electrons.

It is not a molecule because a molecule is a group of atoms, or a compound, what is shown is a singular atom.

Answer:

true

Explanation:

Answer:

False.

Explanation:

The number of protons in an atom also places it on the periodic table- the 1st element on the periodic table is Hydrogen because it has 1 proton. If it had 2- it'd be Helium. Neon must have 10 protons to be #10 on the periodic table. (and to even be Neon)

Answer:

721.9 grams

I hope this helps!

Answer:

b

Explanation:

kkkk(kkkkkkkkkkkkwritten am an ah roo ero di si di dh dh ah ah eh si eri di do

Answer: the answer is B. C

Explanation:

Explanation:

2.3346591 miles is in 12327 feet

Answer:

Explanation:

Always remember, to convert

feet to miles, all you have to do is

divide the length by 5280 and then

you will get this much miles: 2.3346591

Hope this helps! <3

Answer:

bacteria, protists, and yeast.

Explanation:Unicellular organisms are made up of only one cell that carries out all of the functions needed by the organism, while multicellular organisms use many different cells to function. Unicellular organisms

Since water has a high specific heat, that results in water being able to store/require more energy in order to change it’s temperature. Since San Francisco is so close to water, that would mean that it’s temperature should vary less since water would be able to keep the temperature around the same value even if there was an increase or decrease in thermal energy.  

Answer:

02

Explanation:

all the other options given are compounds

Answer:

Explain that unlike sound, light waves travel fastest through a vacuum and air, and slower through other materials such as glass or water.

Explanation:

Hope this helped.

Answer:

empty space

Explanation:

Answer: Conduction

Explanation:

Answer:

13.5 moles of Ne

Explanation:

1 mole of any gas contains  6.02 x 10²³ atoms of gas

6.02 x 10²³ atoms of neon is equal to 1 mole of neon .

8.15 x 10²⁴ atoms of neon is equal to  1 x 8.15 x 10²⁴ / 6.02 x 10²³ moles

= 8.15 x 10²⁴ / 6.02 x 10²³ mole o neon

= 13.5 moles of Ne .

Answer:

327.8689 (Hz)

0.3279 (KHz)

0.0003 (MHz

0 (GHz)

Answer:

Oxygen has an atomic number of 8 , and the mass number of an atom is the sum of its atomic number plus its neutron number. We got the mass as 16 units, and so it'll have 16−8=8 neutrons.

Explanation:

The volume of cylinder = 7.948 cm³

Further explanation

Volume is a derivative quantity derived from the length of the principal

The unit of volume can be expressed in liters or milliliters or cubic meters

The volume of the aquarium is almost the same as the beam namely:

V = length x width x height

The volume of a cylinder can be formulated :

[tex]\tt V=\pi.r^2.h[/tex]

r = radius

h = height

Diameter of cylinder = 1.25 cm

radius=r :

[tex]\tt \dfrac{1.25}{2}=0.625~cm[/tex]

[tex]\tt V=\pi\times 0.625^2\times 6.48\\\\V=\boxed{\bold{7.948~cm^3}}[/tex]

Answer:

1) 3Fe + 2O(2, this is the subscript) - Fe(3)O(4)

2) 2Sr + O(2) - 2SrO

3) Sn + 2NaOH - Na(2)SnO(2) + H(2)

4) 2K + Br(2) -2KBr

5) 2C(8)H(18) + 25O(2) - 16CO(2) + 18H(2)O

Answer:

Explanation:

The density of a substance can be found by using the formula

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

From the question

mass = 21.7 kg = 21700 g

volume = 5.78 cm³

We have

[tex]density = \frac{21700}{5.78} \\ = 3754.3252...[/tex]

We have the final answer as

Hope this helps you

Answer:

The heat is transferred from your hand to the ice, this is because, as we know, heat gets transferred from a hot object to a colder object.

In this case, our hand is clearly hotter than the ice cube.

Therefore, the heat is transferred from your hand to the ice cube.

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Thank You!!

Answer:

1. linear (A)

2. trigonal-planar (C)

3. tetrahedral (B)

4. linear (A)

Explanation:

Just did it on Edge 2020

The shape of a molecule can be predicted from the number of electron pairs that surround the central atom in the molecule.

The Valence Shell Electron Pair repulsion theory gives us a basis for predicting the shape of molecules. The shape of a molecule can be predicted from the number of electron pairs that surround the central atom in the molecule.

In the image shown, We can see that in HCN , carbon is the central atom and is surrounded by two atoms and no lone pairs. Since there are two electron domains around the central atom, the molecule is linear.

In the second structure, BH3 has boron as its central atom. Three electron domains surround the central atom hence the molecule is trigonal planar.

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Answer: c. ceabd

Explanation: Substances that are more dense move to the bottom of the beaker. Substances that are less dense float to the top.