chemistry question help please​

Answer:

D

Explanation:

You need both, independant and dependant variables for a hypothesis.

Answer:

The object has to move a distance when a force is applied to it

Explanation:

For work to be done on a body the force applied must move the body through a particular distance.

  Work done  = Force x distance  

If no distance is moved by the force, no work is done.

Also, the angle between the force and the distance must be 0 to do the maximum work on the body.

Answer:

1. Na2SO4 + Ba(NO3)2 → NaNO3 + BaSO4

2. NaNO3 + NH4Cl → NaCl + NH4NO3

4. Sorry, I don't know

5. Refer to the attachment..

6. NaC2H3O2(aq) + AgNO3(aq) = NaNO3(aq) + AgC2H3O2

[tex] \huge{\blue{Thank \: you}}[/tex]

Answer:

18.65004 grams H2O

Explanation:

First, we need to write down the balanced chemical equation for the decomposition reaction:

2LiOH -> H2O + Li2O

Since we have grams of LiOH and we need to know the grams of water, we need to convert to moles since we can only compare moles to moles.

The amu of LiOH is 23.947.

The given grams of LiOH is 63.. To convert to moles, we will divide 63 by 23.947..

This gives us 2.6310 moles LiOH..

To convert to moles of H2O (and later grams of H2O), we will use the mole fractions from the balanced equation...

When we look at the balanced equation we can see that 2 moles of LIOH can produce 1 mol of Water, so:

2.6310 moles [tex]* \frac{1 molH_{2}O}{2 mol LiOH}[/tex] = 1.3155 moles H2O

Now we will convert from moles to grams (we must multiply by the amu)

1.3155 moles H2O = 18.65 grams H2O

According to stoichiometry of the chemical equation of decomposition of lithium hydroxide 23.6 g of water are produced from the decomposition of 63 grams of lithium hydroxide.

Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is useful in balancing chemical equations.

In the given example, as 47.9 g of lithium hydroxide produces 18 g water ,therefore 63 of lithium hydroxide will produce 63×18/47.9=23.6 g of water.

Thus, 23.6 g of water are produced from the decomposition of 63 grams of lithium hydroxide.

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Answer:

a)6.730×10⁻⁴

b)5×10⁴

c)3.010×10⁻⁶

d)1.3240×10²

e)2.232×10³

The given numbers in scientific notation are [tex]6.730 \times 10^{-4}[/tex], [tex]5.0 \times 10^4[/tex], [tex]1.3240 \times 10^2[/tex],  [tex]2.232 \times 10^3[/tex] and  [tex]2.232 \times 10^3[/tex], respectively.

Scientific notation is a way of expressing very large or very small numbers in a compact and convenient form.

To express a number in scientific notation, we need to write the number in the form: [tex]\rm a\times 10^b[/tex]

a) 0.0006730 can be written in scientific notation as [tex]6.730 \times 10^{-4}[/tex]. The decimal point was moved 4 places to the right, so the exponent is negative 4.

b) 50000.0 can be written in scientific notation as [tex]5.0 \times 10^4[/tex]. The decimal point was moved 4 places to the left, so the exponent is positive 4.

c) 0.000003010 can be written in scientific notation as [tex]3.010 \times 10^{-6}[/tex]. The decimal point was moved 6 places to the right, so the exponent is negative 6.

d) 132.40 can be written in scientific notation as [tex]1.3240 \times 10^2[/tex]. The decimal point was moved 2 places to the left, so the exponent is positive 2.

e) 2232 can be written in scientific notation as [tex]2.232 \times 10^3[/tex]. The decimal point was moved 3 places to the left, so the exponent is positive 3.

Therefore, [tex]6.730 \times 10^{-4}[/tex], [tex]5.0 \times 10^4[/tex], [tex]1.3240 \times 10^2[/tex],  [tex]2.232 \times 10^3[/tex] and  [tex]2.232 \times 10^3[/tex], are the scientific notation for the given numbers.

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Answer:

63.6%

Explanation:

The given compound is:

     N₂O;

The problem here is to find the percent composition of nitrogen in the compound.

First find the molar mass of the compound:

 Molar mass of N₂O = 2(14) + 16  = 44g/mol

So;

 Percentage composition of Nitrogen  = [tex]\frac{2 x 14}{44}[/tex]  x 100  = 63.6%

Answer:

its the last one

Answer:

D

Explanation:

Answer:

Explanation

whats your question

Answer:

c

Explanation:

Answer:

How many moles H2O in 1 grams? The answer is 0.055508435061792.

We assume you are converting between moles H2O and gram.

You can view more details on each measurement unit:

molecular weight of H2O or grams

This compound is also known as Water or Dihydrogen Monoxide.

The SI base unit for amount of substance is the mole.

1 mole is equal to 1 moles H2O, or 18.01528 grams.

Explanation:

The mass of 4.0 moles of water is 72 grams.

Explanation:

[tex]Moles=\frac{\text{mass of substance}}{\text{molar mass of substance}}[/tex]

Given:

The 4.0 moles of water

To find:

Mass of moles of water

Solution:

The moles of water = 4.0 moles

The mass of water = M

The molar mass of water = 18.01528 g/mol

[tex]4.0=\frac{m}{ 18.01528 g/mol}\\m=4.0\times 18.01528 g/mol\\=72.06112 g\approx 72 g[/tex]

The mass of 4.0 moles of water is 72 grams.

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Answer:

84 pt =__50.4399___ qt

5.0 gal =___18.9271__ L​

Explanation:

Have A Wonderful Day!!

Answer: 84 pints = 42 quarts

5.9 gallons = 1.89271

Explanation:

Answer:

Star B

Explanation:

Star B, this is because, usually in the discussions about stars, the more luminous star or say, the brighter star usually is the one that possesses the smaller absolute brightness.

That being said, succinctly put, if we have two stars A and star B, if star A is brighter than star B, then star A has a lower absolute brightness. Also, if star B is less brighter than star A, then it has the higher absolute brightness.

Answer:

STAR B

Explanation:

Explanation:

Given parameters:

Mass of carbon dioxide  = 250g

Molar mass of carbon dioxide  = 44.01g/mol

Unknown:

Number of moles of carbon dioxide  = ?

Number of molecules of carbon dioxide  = ?

Solution:

We first find the number of moles of carbon dioxide;

 Number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

  Number of moles  = [tex]\frac{250}{44.01}[/tex]   = 5.68moles

 From mole concept;

          1  mole of a substance contains 6.02 x 10²³ molecules

      5.68 mole of carbon dioxide will contain 5.68 x  6.02 x 10²³

                                                                = 3.42 x 10²⁴molecules

Answer:

This compound is HNO2

Explanation:

HNO2 ----> H+ + NO2

When metals and non metals combine in fixed proportion then a chemical compound is formed So, the compound that will be formed from  hydrogen ion and nitrate ion is Hydrogen nitrate.

Chemical formula is a formula where cation and anion combine to form a molecule in fixed proportion. Metals combine in form of cation and non metals combine in form of anion.

Cation is the species that give electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.

Therefore, the compound that will be formed from hydrogen ion and nitrate ion is Hydrogen nitrate.

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Answer:

Lithium

Explanation:

Answer:

D. The nucleus occupies very little of the volume but contains most of its mass

Explanation:

Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore,  the nucleus occupies very little of the volume but contains most of its mass. The correct option is option D.

Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.

Mathematically,

Density = Mass of an atom's nucleus ÷volume marked on the graduated cylinder

Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.  The nucleus occupies very little of the volume but contains most of its mass.

Therefore,  the nucleus occupies very little of the volume but contains most of its mass. The correct option is option D.

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Answer:

Pb(OH)2 + 2 HCl ---> 2H2o + PbCl2

Explanation:

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:

the third one

Explanation:

Answer:

it would need to lose energy

Explanation:

I don't really have an explanation

As the electrons gets closer to the nucleus, by the electrostatic force of attraction electrons are tightly bound to the nucleus. To move the inner electron to outer shell, high energy have to applied to weaken the nuclear force.

Nuclear force is the force by which the nucleon are bind in the nucleus and electrons are attracted towards the nucleus. The positively charged protons inside the nucleus electrostatically attracts the negatively charged electrons.

The minimum amount of energy required to remove an electron from the valence shell by overcoming the nuclear force is called ionization energy.

To bring an electron which is closer to the nucleus to the outer shell needs much energy to reduce the nuclear attractive pull. The energy need to gain.

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Answer:

Percent composition is calculated from a molecular formula by dividing the mass of a single element in one mole of a compound by the mass of one mole of the entire compound. This value is presented as a percentage.

Explanation:

Answer:

either first or second if not them try d but I'm pretty sure a also I'm sorry if I getbyou this wrong I dearly apologize

Answer:

c! Hope this helps!

Explanation:

BRAINLIEST PLZ ;)

Answer:

I think its the third one im not sure tho

Explanation:

Answer:

the third one because oceans don't affect the weather  

Explanation: