PLEASE HELP, dana wants...​

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:

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:

12

Explanation:

Answer:

6 months and 1 day

Explanation:

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:

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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:

10Rb° + 2RbNO₃  =>  6Rb₂O + N₂

Explanation:

Given:   Rb° + RbNO₃ => Rb₂O + N₂

=> 1st balance rubidium in RbNO₃ against Rb₂O  by inserting a '2' coefficient before RbNO₃ and a '6' coefficient  before Rb₂O

=> Rb° + 2RbNO₃  =>  6Rb₂O + N₂   => Oxygen and Nitrogen are balanced. All that remains is balancing Rb by inserting a '10' coefficient.

=>  10Rb° + 2RbNO₃  =>  6Rb₂O + N₂

Note: In balancing chemical equations, saving an element that is not part of a compound until last frequently gives balance by inspecting the number of elements of the specific kind and boosting its coefficient to balance the equation.  

Balanced equation =>  10Rb° + 2RbNO₃  =>  6Rb₂O + N₂

The balanced chemical reaction can be of the equation given is [tex]2Rb + RbNO_3 - > Rb_2O + N_2[/tex].

We need to make sure that the amount of atoms of each element is the same on both sides of the equation in order to balance the chemical equation [tex]Rb + RbNO_3- > Rb_2O + N_2[/tex].

By counting the atoms in each element, we may begin to balance the equation. We have one Rb, one Rb, one N, and three O atoms on the left side. We have two Rb, one N, and two O atoms on the right side.

We can add a coefficient of 2 in front of [tex]RbNO_3[/tex] to balance the Rb atoms, which gives us:

[tex]2Rb + RbNO_3 - > Rb_2O + N_2[/tex]

Thus, now, the equation is balanced with two Rb atoms on both sides.

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Answer: C, 36,450.06 moles

Explanation:

Molar mass=478.41

17.19gx478.41moles=36,450.06

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:

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.

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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: I don’t understand what your asking elaborate more

Explanation:

Answer:

Explanation:    29.99g/mol

Answer:

23.0 g/mol

Explanation:

To find the molar mass of sodium or Na, look at the periodic table.

Then try to find where sodium is.

After that, then try to check the atomic mass of sodium.

The atomic mass of sodium is 23.0

So the molar mass is 23.0 g/mol

That's it. Molar mass means the same thing as atomic mass.

Hope it helped!

Answer:

Fossil record

Explanation:

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

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:

53.49146

Explanation:

Explanation:

6.The main pieces of evidence that scientists use to classify organisms are essentially form and evolutionary relationships.

9. chimpanzee

10. The answer is no, lemurs are not bipedal, i.e, they don't use two legs for walking like human do and they don't have language like ours.

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:

stronger

Explanation:

there is more gravity on Jupiter since it is bigger than earth

Answer:

Nitride.

Explanation:

Have a good day, friend.

Answer:

A

Explanation:

In simple terms: Hammer goes one way, air goes the other way.

Answer:

d

Explanation:

i took the test

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:

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:

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

Explanation:

Answer:

67.89

Explanation:it’s right

The percent composition of carbon in  compound of acrylonitrile is 22.646%.

Percent composition  is defined as a convenient way to record concentration of solution.It is a expression which relates mass of element  to mass of compound  as,mass of element/mass of compound×100.

Percent composition helps in elemental analysis of compound which is useful in analysis of ores also.  It helps in making solutions while performing the titrations.  It helps in prediction of chemical formula which can be predicted by mass and molar mass of an element.

The compound acrylonitrile  has a molar mass 53.06 g/mole and that of carbon is 12 g/mole thus, percent composition of carbon in  compound of acrylonitrile is 12/53.06×100=22.646%.

Thus, the percent composition of carbon in  compound of acrylonitrile is 22.646%.

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Answer:

the third one

Explanation: