Plzzzz help I’ve been with this for like 2 hours Ik it’s sad my momma didn’t give me a brain

Answer:

113

Explanation:

We are given that the atom of cadmium has 66 neutrons:

  Number of neutrons in Cd  = 66

Now;

 Mass number  = ?

The mass number of an element is the sum of the number of protons and number of neutrons

     Mass number  = number of protons + number of neutrons

 By the position of cadmium, it has an atomic number of 47 and this is the number of protons

     Mass number  = 47 + 66  = 113

Answer:

Pb₂O₄

Explanation:

The given species are:

        Pb⁴⁺               O²⁻  

Now, to solve this problem, we use the combining powers which corresponds to the number of electrons usually lost or gained or shared by atoms during the course of a chemical combination.

                                          Pb⁴⁺               O²⁻  

Combining power               4                    2

Exchange of valencies        2                    4

Now the molecular formula is  Pb₂O₄

Answer:

λ  =  1.5 m

Explanation:

Given data:

Speed of wave = 1500 m/s

Frequency of sound = 1000 Hz

Wavelength of sound = ?

Solution:

Speed of wave = frequency × wavelength

by putting values,

1500 m/s  = 1000 Hz ×  λ

λ  =  1500 m/s  / 1000 s⁻¹     (Hz =  s⁻¹ )

λ  =  1.5 m

Answer: 1.5

Explanation:

Well first you do

1500/ 1000= 1.5 which mean

The wavelength is 1.5

Answer:

I believe the answer is A. molecules are larger than atoms so they should be visible and atoms and molecules are indeed different

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the correct option is option A.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.  Most atoms are bonded together to make a molecule. Molecules combine to form compounds.

Therefore, the correct option is option A.

To know more about atom, here:

https://brainly.com/question/13518322

#SPJ2

Answer:

Nitride.

Explanation:

Have a good day, friend.

Answer:

It would be Container 3

Explanation:

Each of the containers has the same amount of salt.  Salinity refers to salt level.  Since the question is asking for the container with the greatest salinity, you are looking for the container with the least water (because it will be the saltiest out of all of them).  Container 3 has the least water.

Hope this helps :)

3 has less water so its saltier

Answer:

We know that kinetic energy is one of the forms of internal energy, so the release of heat from an object causes a decrease in the average kinetic energy of its particles.

Answer:

Mass = 824.57 g

Explanation:

Given data:

Mass of bromine = ?

Number of moles of bromine = 5.16 mol

Solution:

Formula:

Mass = number of moles × molar mass

Molar mass of bromine = 159.8 g/mol

by putting values,

Mass = 5.16 mol × 159.8 g/mol

Mass = 824.57 g

Answer:

12

Explanation:

Answer:

1.5 moles of sodium chloride are present.

Explanation:

Given data:

Number of moles of sodium chloride = ?

Number of atoms of sodium chloride = 9.07×10²³

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

9.07×10²³ atoms  × 1 mol / 6.022 × 10²³ atoms

1.5 moles of sodium chloride are present.

Answer:

d. Electrons have a negative charge and are lighter than protons

Explanation:

The best statement that describes electrons is that electrons are negatively charged and are lighter than protons.

There are three known subatomic particles which are:

The mass of the protons and neutrons are similar.

Electrons are lighter than both protons and neutrons.

Answer:

An opinion.

Explanation:

In physics, Sir Isaac Newton's first law of motion is known as law of inertia and it states that, an object or a physical body in motion will continue in its state of motion at continuous velocity (the same speed and direction) or, if at rest, will remain at rest unless acted upon by an external force.

The statement, "Roller coasters are the best use of Newton's laws of motions" is an opinion because it is not based on any evidence, facts or has a proof to back it up.

In English literature, an opinion is considered to be more like a claim.

A claim can be defined as a statement that is used by a writer to prove, substantiate or support an argument. Thus, a claim is an assertive statement expressed by a writer to prove that an argument is true or real.

Answer:

The answer is B. 1,2,6,9,27,54

Explanation:

Answer:

How many atoms of hydrogen and oxygen are in 2 molecules of water? ... 7) Using complete sentences, explain the difference between the chemical ... (s) solid, (l) liquid, (g) gas, (aq) aqueous solution (dissolved in water).

Explanation:

hope this helps✌️

The reactants in this reaction are sodium and chlorine. Sodium is a soft, silvery-white metal that is highly reactive. Chlorine is a poisonous greenish-yellow gas that has an odor and combines readily with other elements.

This might be the exact question so you might wanna rephrase it but good luck! :)))

A reactant is a substance that undergoes change during a chemical reaction.

A reaction in a chemical experiment is which takes place when there are mixtures between two or more reactants.

There are about four types of reactions which are:

Please note that your question is not complete, therefore, i would give you a general overview to help you.

Some examples of reactants include:

Read more here:

https://brainly.com/question/12056938

Answer:

6 months and 1 day

Explanation:

Answer:

Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.

Answer: I don’t understand what your asking elaborate more

Explanation:

Answer:

B. A carbon monoxide molecule(CO)

Explanation:

CO is polar because oxygen is more electronegative than carbon, so it gives oxygen a partial negative charge and carbon and partial positive charge. This causes a net dipole moment. CO2 is linear with no net dipole moment because each C-O bond is equal and opposite to each other, so they equal 0, which makes them non polar.

Answer: C, 36,450.06 moles

Explanation:

Molar mass=478.41

17.19gx478.41moles=36,450.06

Answer:

Fossil record

Explanation:

but first think about it befor you do so it could be wrong im not a computer

Answer:

sample 2

Explanation:

hope this helps

Answer:

1.55 x 10²⁴ formula units

Explanation:

Given parameters:

Number of moles of CaCl₂   = 2.58moles

Unknown:

Formula units in the compound  = ?

Solution:

To solve this problem, we must understand that;

    1 mole of a substance contains 6.02 x 10²³ formula units

   2.58 moles will contain 2.58 x  6.02 x 10²³ formula units  

                                            = 1.55 x 10²⁴ formula units

Answer:The Hot tea makes the mug a hot mug

Explanation:

Answer: The thermal (heat) energy in the tea, is being transferred to the mug

Answer:

Mass = 14.025 g

Explanation:

Given data:

Mass of Ca burn = 10 g

Mass of calcium oxide produced = ?

Solution:

Chemical equation:

2Ca + O₂     →    2CaO

Number of moles of Ca:

Number of moles = mass /molar mass

Number of moles = 10 g/ 40 g/mol

Number of moles = 0.25 mol

now we will compare the moles of Ca and CaO

               Ca            :             CaO

                 2             :              2

               0.25          :            0.25

Mass of CaO;

Mass = number of moles × molar mass

Mass = 0.25 mol × 56.1 g/mol

Mass = 14.025 g

Answer:

the third one

Explanation: