Toothpaste is an alkali. How could you use the toothpaste to show that red cabbage is an indicator?

Answer:

To catch a ball, the fielder has to stop the ball. This means, force is applied against the motion of the ball. So, between the fielder applies force on the ball and the ball comes to rest, the ball moves in the direction opposite to the direction of force. Thus work is negative.

Explanation:

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Answer:

D as a mixture is not a compound and it does not have it's own chemical formula

Explanation: Sauce me brainliest

It cannot be described by a chemical symbol or formula.

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Answer:

From the equation you will see that 1 mol of propane generates 4 mols of water.

Since the molar mass of water  

M ( H2O)=2×1+16=18g/mol

2 mol propane will generate  

2 ×4×18=144g   of water

Explanation:

Since the molar mass of water  

M ( H2O)=2×1+16=18g/mol

2 mol propane will generate  

2 ×4×18=144g   of water

Answer:

Question:

A spring with a spring constant of 30 N/m is stretched 0.2 m from its equilibrium position. How much work must be done to stretch it an additional 0.1 m?

Elastic Potential Energy:

The work that needs to be done by any object is a form of energy. The work can be defined in terms of the work-energy theorem, which states that the work can either be the difference in the kinetic energy of a system or the difference in the potential energy of a system. There is a special type of potential energy reserved exclusively for

The number of moles of NaCl = 0.103

Given

6 gram sample of NaCl

Required

moles

Solution

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

mole = mass : molar mass

Molar mass of NaCl = 58.5 g/mol

Input the value :

mole = 6 g : 58.5 g/mol

mole = 0.103

Moles of Helium = 2

Given

12.04 x 10²³ atoms of helium

Required

moles

Solution

The mole is the number of particles(molecules, atoms, ions) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

moles Helium :

n = N : No

n = 12.04 x 10²³ : 6.02 x 10²³

n = 2

Answer:

Moles O2 = pV/RT = 2.75 x 5.60 / 0.08206 x 250=0.751

mass = 32 g/mol x 0.751 mol= 24.0 g

Explanation:

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The mass of 5.60 Liter oxygen at 1.75 atm pressure and 250.0 K temperature is 24.0 gram.

Ideal gas equation is a hypothesis which tells about the behavior of gas at standard condition and it is represented as:

PV = nRT, where

P = pressure = 1.75 atm

V = volume = 5.60 L

R = universal gas constant = 0.0821 L.atm /K.mol

T = temperature = 250 K

n is the moles of gas which will further define as:

n = W/M, where

W = required mass

M = molar mass

Now putting all the value in the above ideal gas equation and calculate for moles as:

n = (1.75)(5.60) / (0.0821)(250)

n = 0.751

Molar mass of oxygen is 32 g/mol and we calculate their required mass as:
W = 32 g/mol x 0.751 mol= 24.0 g

Hence, the required mass of oxygen is 24.0 g.

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Answer:

This reaction is the synthesis of Ammonia using Nitrogen and Hydrogen gas.

N+H→NH3

We must remember that Nitrogen and Hydrogen are both diatomic molecules in their standard gas form. This adjusts the equation to

N2+H2→NH3

Now we need to adjust coefficients in order to balance the atoms on each side of the equation. Currently, we have 2 atoms of nitrogen and 2 atoms of hydrogen on the reactant side and 1 atom of nitrogen and 3 atoms of hydrogen on the product side.

We can balance the hydrogens by placing a coefficient of 2 in front of ammonia and a coefficient of 3 in front of the hydrogen.

N2+3H2→2NH3

This gives us 6 hydrogen on each side and coincidentally the nitrogens now equal 2 on each side.

Explanation:

I hope this was helpful.

SMARTERTEACHER

Answer:

Balance the equation N2 + H2 ⇒ NH3

Balancing chemical equations is usually easier than it looks

There are 2 Nitrogens and 2 Hydrogens on the left side

There are 1 Nitrogen and 3 Hydrogens on the right side

Hydrogen seems to be the more complicated term so we should start with that

_N2 + _H2 ⇒ _NH3

With 2 H on one side and 3 on the other, our common multiple is 6

To balance the H we need to multiply H2 by 3 and NH3 by 2

_N2 + 3H2 ⇒ 2NH3

Now that we have H balanced, we need to look at N

There are 2 Nitrogens on both sides of the equation, so in this case, it is done

Answer:

Gjvb

Explanation:

Using the combined gas law equation as follows:

P1V1/T1 = P2V2/T2

Where;

P1 = initial pressure (kPa)

P2 = final pressure (kPa)

V1 = initial volume (L)

V2 = final volume (L)

T1 = initial temperature (K)

T2 = final temperature (K)

According to this question;

T1 = 300K

T2 = -73 + 273 = 200K

P1 = 303kPa

P2 = 202kPa

V1 = 2L

V2 = ?

Using the above formula:

303 × 2/300 = 202 × V2/200

606/300 = 202V2/200

Cross multiply;

606 × 200 = 300 × 202V2

121200 = 60600V2

V2 = 121200/60600

V2 = 2L

The new volume is 2L

Answer: helium has the largest first ionization energy, while francium has one of the lowest.

Explanation:

The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest first ionization energy, while francium has one of the lowest.

Answer:

Helium has the highest

Explanation:

Tectonic forces do not cause plates to slide over and under each other, to produce heat and pressure which forms igneous rocks

The rock cycle is a cycle which describes how the three basic rock types are related and how earth processes convert one rock type into another over geologic time.

Plate tectonic forces together with weathering and erosional processes, are responsible for the rock cycle.

Tectonic forces play the following roles in rock cycle:

Therefore, the statement that when plates slide over and under each other, the heat and pressure form igneous rocks is not True.

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Answer:Skeletal muscle can undergo hypertrophy, as each cell gets bigger.

Explanation:

Answer:

Sperm cells and egg cells don't go through mitosis.

Explanation:

The vapor pressure (in torr) of a 35°C solution : 52 torr

Given

x propanol = 0.75

P°ethanol=100 torr

P°propanol=36 torr

Required

the vapor pressure

Solution

Raoult's Law

P solution = xA.P°A +xB.P°B

x ethanol = 1- 0.75 = 0.25

Input the value :

P solution = 0.25 x 100 + 0.75 x 36

P solution = 25 + 27

P solution = 52 torr

Answer:

the second stage of cell division. its between prophase and anaphase during the chromosomes become attached to spindle fibers.

Answer:

The answer is endothermic

Answer:

ummmmmmm just not lookin good enough i guess lol

Explanation:

ty 4 the points

Answer:Na2O

Explanation:

When sodium  and oxygen combine, the resulting  chemical formula will be Na₂O.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

There are four types of chemical formula:

1)empirical formula

2) structural formula

3)condensed formula

4)molecular formula

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Answer:

Argon is a chemical element with the symbol Ar and atomic number 18.

Explanation:

Answer:

Avogadro's number is a very important relationshiptoremember: 1 mole = 6.022×1023 6.022 × 1023atoms, molecules, protons, etc.

...

Explanation:

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The question is incomplete, the complete question is;

The student collects the H2(g) produced by the reaction and measures its volume over water at 298 K after carefully equalizing the water levels inside and outside the gas-collection tube, as shown in the diagram below. The volume is measured to be 45.6mL . The atmospheric pressure in the lab is measured as 765 torr , and the equilibrium vapor pressure of water at 298 K is 24 torr .(i) The pressure inside the tube due to the H2(g)

Answer:

741 torr

Explanation:

From the question we can see that the atmospheric pressure in the lab is 765 torr.

The vapour pressure of water = 24 torr

From Dalton's law of partial pressure, we know that;

Total pressure = Pressure of the H2 + Partial pressure of water vapour

Therefore;

Pressure of H2 = Total pressure - Partial pressure of water vapour

Pressure of H2 = 765 torr - 24 torr = 741 torr

Answer:

The mass of 3.5 moles of Ca is 140 g to two significant figures.

Explanation:

Answer:

a

Explanation:

Answer:

Explanation:

gravity

Answer:

[tex]\boxed {\boxed {\sf 301.325 \ Joules }}[/tex]

Explanation:

Since we are given the mass, specific heat, and change in temperature, we should use this formula for energy:

[tex]q=mc \Delta T[/tex]

The mass of the graphite is 25 grams. Graphite's specific heat is 0.709 J/g °C. The change in temperature is 17 degrees Celsius.

[tex]m= 25 \ g \\c= 0.709 \ J/g \ \textdegree C \\\Delta T= 17 \ \textdegree C[/tex]

Substitute the values into the formula.

[tex]q= (25 \ g)( 0.709 \ J/g \ \textdegree C )( 17 \ \textdegree C)[/tex]

Multiply the first two numbers. The grams will cancel.

[tex]q= 17.725 \ J/ \textdegree C(17 \ \textdegree C)[/tex]

Multiply again. This time the degrees Celsius cancel.

[tex]q= 301.325 \ J[/tex]

The graphite loses 301.325 Joules of energy.

Volume of H2 produced = 57.6576 L

Given

23.17 g Be

Required

Volume of H2

Solution

Reaction

Be(s)+H2O(g)→BeO(s)+H2(g)

mol Be :

= 23.17 g : 9 g/mol

= 2.574

From the equation, mol H2 : mol Be = 1 : 1, so mol H2 = 2.574

Volume H2(assumed at STP, 1 mol=22.4 L) :

= 2.574 x 22.4 L

= 57.6576 L