The mole is used in chemistry

A) to count large numbers of very small particles, such as atoms or molecules.
B) to relate the mass and the number of particles of a substance to each other.
C) to relate the mass and the volume of a substance to each other.
D) all of these are true.

Answer:

Eliptical

Explanation:

While some orbits may seem circular, like Earth's, it is still an ellipse. Planets orbit stars in an elliptical shape, but some come very close to perfect circles. As for the other two, im certain you have never seen a triangular or spherical orbit. Hope this helps.

Answer:

2

Explanation:

Answer:

A closed container is the best way to measure the volume of a liquid

Answer:

O energy is quantized

Explanation:

Bohr's model of that atom attempts to explain the idea that energy is quantized within an atomic space.

Answer:

22.4 L

Explanation:

Answer:

I think C but it could be D

Explanation:

I would say go for C

Answer:

Salinity is a measure of the 'saltiness' of seawater, or more precisely the amount of dissolved matter within seawater.

Answer:

Sound waves travel through matter

Explanation:

Higher amplitude sound waves are more likely to be transmitted through matter instead of reflected. Lower amplitude sound waves are more likely to be reflected or absorbed, resulting in a lack of an echo. Sound can travel through air, water, and solids

Answer:

332g

Explanation:

Given parameters:

Formula units  = 2 x 10²⁴

Unknown:

Mass of the compound = ?

Solution:

The formula of the compound is:

            CaCO₃

      6.02 x 10²³ atoms are contained in 1 mole of a compound

       2 x 10²⁴ atoms will be made up of [tex]\frac{2 x 10^{24} }{6.02 x 10^{23} }[/tex]   = 3.32mole of CaCO₃

 Mass of CaCO₃  = number of moles x molar mass

      Molar mass of CaCO₃  = 40 + 12 + 3(16) = 100g/mol

 Mass of CaCO₃  = 3.32 x 100  = 332g

Answer:

Lime(Calcium Oxide) is a white solid with strongly basic properties.Lime reacts readily with water to produce slaked lime,which is the chemical compound calcium hydroxide.....

When carbon dioxide gas is passed through or over limewater,it turns milky due to the formation of calcium carbonate.

Answer:

2.35 x 10²³atoms

Explanation:

Given parameters:

Number of moles of Be  = 0.39moles

Unknown:

Number of atoms  = ?

Solution:

To solve this problem:

                1 mole of a substance contains 6.02 x 10²³ atoms

               0.39 mole of Be will contain 0.39 x 6.02 x 10²³ = 2.35 x 10²³atoms

Answer:

4.00L

Explanation:

Using Charle's law, which have the following equation:

V1/T1 = V2/T2

Where;

V1 = initial volume (litres)

T1 = initial temperature (Kelvin)

V2 = final volume (litres)

T2 = final temperature (Kelvin)

According to the information provided, T1 = 275K, T2 = 400K, V1 = ?, V2 = 5.82L

Hence, using the formula;

V1/275 = 5.82/400

400 × V1 = 275 × 5.82

400V1 = 1600.5

V1 = 1600.5 ÷ 400

V1 = 4.001

Therefore, volume of the gas before it is heated is 4.00L

Answer:

When an electric current is passed through a gas, the gas emits light. Neon signs operate in this way; a tube having an electrode at each end is filled with a gas at low pressure and a high voltage (generally in the range of 1000 to 5000 volts) is applied to the electrodes.

Explanation:

a. t = 4.33 s

b. R = 53.04 m

c. H = 22.97 m

Given

vo=initial velocity=24.5 m/s

Angle = θ = 60°

Required

(a) time of flight, (b) range, and (c) maximum height.

Solution

Parabolic motion

a. time to flight

t = (2vo sin θ) / g

t = (2 x 24.5 x sin 60) / 9.8

t = 4.33 s

b. range (horizontal range) :

R = (vo² sin2θ )/g

R =(24.5² sin 120)/9.8

R = 53.04 m

c. maximum height

H = (vo²sin²θ)/2g

H = (24.5²sin²60)/2.9.8

H = 22.97 m

Answer:

A spatial pattern is a perceptual structure, placement, or arrangement of objects on Earth. It also includes the space in between those objects. Patterns may be recognized because of their arrangement; maybe in a line or by a clustering of points.

Explanation:

Answer:

c = 0.898 J/g.°C

Explanation:

1) Given data:

Mass of water = 23.0 g

Initial temperature = 25.4°C

Final temperature = 42.8° C

Heat absorbed = ?

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Specific heat capacity of water is 4.18 J/g°C

ΔT = 42.8°C - 25.4°C

ΔT = 17.4°C

Q = 23.0 g ×  × 4.18 J/g°C × 17.4°C

Q = 1672.84 j

2) Given data:

Mass of metal = 120.7 g

Initial temperature = 90.5°C

Final temperature = 25.7 ° C

Heat released = 7020 J

Specific heat capacity of metal = ?

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 25.7°C - 90.5°C

ΔT = -64.8°C

7020 J = 120.7 g ×  c ×  -64.8°C

7020 J = -7821.36 g.°C ×  c

c = 7020 J / -7821.36 g.°C

c = 0.898 J/g.°C

Negative sign shows heat is released.

Answer:

4.43 g

Explanation:

The reaction between sodium chloride and flourine gas is given as;

NaCl + F2 --> NaF + Cl2

From the stochiometry of the equation;

1 mol of NaCl reacts eith 1 mol of F2 to form 1 mol of NaF and Cl2

Mass of 1 mol of F2 = 38g

Mass of 1 mol of sodium flouride, NaF = 42g

This means 38g of flourine reacted with NaCl to form 42g of NaF

xg of F2 would form 4.9g of NaF

38 = 42

x = 4.9

x = 4.9 * 38 / 42

x = 4.43 g

Answer:

28 %

Explanation:

Mass mass N2O = 28 + 16 = 44 mass nitrogen = 2 x 14 = 28 % nitrogen Chemistry.

Answer:

direction

Explanation:

A P E X

THe correct answer is heat

Answer:

hi

Explanation:

heat

Answer:

The level of CO2 in the blood is detected by chemoreceptors located in the aortic arch

and carotid arteries. These send impulses to either the cardioaccelerator or

cardioinhibitor center in the hypothalamus of the brain, which in turn sends an

impulse to the pacemaker of the heart to increase or decrease heart rate. Draw a

feedback diagram to illustrate what happens to restore homeostasis when blood CO2

rises.

Explanation:

The level of CO2 in the blood is detected by chemoreceptors located in the aortic arch

and carotid arteries. These send impulses to either the cardioaccelerator or

cardioinhibitor center in the hypothalamus of the brain, which in turn sends an

impulse to the pacemaker of the heart to increase or decrease heart rate. Draw a

feedback diagram to illustrate what happens to restore homeostasis when blood CO2

rises.

Answer:

How many molecules of water are there in 54 g of H2O H 2 O ? Solution. Molar Mass of H2O H 2 O = 2 + 16 = 18 g/moles. So ,number of moles of H2O H 2 O = Mass/Molar Mass = 54/18 =3 moles. Now 1 moles = 6.022×1023 6.022 × 10 23 molecule.

Answer:

Chemical Energy is energy stored in the bonds of atoms and molecules. Batteries, biomass, petroleum, natural gas, and coal are examples of stored chemical energy. Chemical energy is converted to thermal energy when we burn wood in a fireplace or burn gasoline in a car's engine.

MARK BRAINLIST PLZ NEEDS ONE MORE

Explanation:

i think the answer is b) i.e. Switch....

according to me ammeter and battery are already there...

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.

For more details regarding chemical reaction, visit:

https://brainly.com/question/34137415

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Answer:

71%

Explanation:

Answer:

2, 2, 2, and 1

Explanation:

I put that in and it was correct.