Based on the information above, which statement provides evidence that a chemical reaction has occurred?






Products release more energy than reactants

Reactants form from the atoms that make up products

There are more atoms in the products than in the reactants

Atoms that make up reactants rearrange into new products

Answer:

8

Explanation:

The speed of the car at each checkpoint cannot be determined because the parameter is not given.

For a moving car, the speed can be defined as the change magnitude in the position of a car or the distance traveled by the car within a specified time.

Mathematically;

[tex]\mathbf{speed = \dfrac{distance}{time}}[/tex]

From the information given; the distance at each checkpoint can be calculated by finding the difference in distance between the previous checkpoint and subsequent checkpoint divided by the change in time.

i.e

[tex]\mathbf{speed = \dfrac{d_A - d_B}{\Delta t}}[/tex]

where:

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answer is below           .     .     .

Answer:

0, 1, 2, 3

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define quantum number

Principal Energy Level n = 4

Step 2: Define ℓ

ℓ is the Angular Momentum. Its values start at 0, 1, 2, 3...

It is the Principal Energy Level n minus 1 (n - 1).

Step 3: Find

n = 4

ℓ = 4 - 1 = 3

Therefore, out angular momentum values can be 0, 1, 2, 3. These correlate to s, p, d, f sublevels.

Answer:

the answer is C acid dissolving limestone

Explanation:

Answer:

the answer is C acid dissolving limestone

Explanation:

The chemicals in the water break down the rocks, so water breaking rocks is an example of chemical weathering :) Also, acids are a form of chemical weathering, as the chemicals dissolve the limestone :) Hope this helped!!

Answer:

A

Explanation:

Answer: a

Explanation: one that changes the color of a rabbit, allowing it to hide from predators.

Answer:

C = λν E = hν C = 3.00 x 108 m/s h = 6.626 2 x 10-34 J-s (or J/Hz) 1 eV = 1.602 x 10-19 J

Explanation:

Answer:

when infectious agents get into the human body your body responds by raising the core body temperature causing a fever

The answer is C it will raise your body temp and cause a fever

Answer:

A. steel spoon

Explanation:

A steel spoon will get hot the quickest from the different given spoon. This is because steel is predominantly made up of a metal which shows metallic properties such as heat conduction.

Other properties originating from metallic bonds are ductility, malleability, luster etc.  

Answer:

Coal is primarily used as fuel to generate electric power in the United States.

Explanation:

Answer:

1. Vinca

2.Zinnia

3.Cornflower

4.Mariglod

4.Geranium

Explanation:

Thank u mark as brainliest

Answer:

like a circle

Answer:

it would look white and its a circle

Explanation:

pLEASE MARK BRAINLIEST

Answer:

8.4 moles

Explanation:

Al4C3 + 12 H2O ---> 4 Al(OH)3 + 3 CH4

100g of Al4C3 = 100/144 = 0.7 moles

from the reaction above,

1 mole of Al4C3 = 12 moles of water

0.7 moles of Al4C3 = x moles of water

x = 12×0.7/1 = 8.4 moles

Therefore 8.4 moles of water is needed to react with 100. g of al4c3

Please don't forget to mark me brainliest if I helped you

The moles of water are needed to react with 100. g of al4c3 - 8.34 moles.

The reaction can be expressed as -

Al₄C₃ + 12 H₂O → 4 Al(OH)₃ + 3 CH₄

By the equation, it can be said that 1 equivalent of Al₄C₃ reacts with the equivalent of 12 H₂O to generate 4 Al(OH)₃ and 3 CH₄.

the moles = mass + molar mass

then for moles of Al₄C₃ = 100 + 143.959

= 0.6946 moles.

or, 216/143.959

for 100 gram = 21600/143.959

= 150. 0416

moles of H₂O required = [tex]\frac{12\ mole\ of H_{2} O}{1\ mole\ of\ Al_{4} C_{3}}[/tex]

= 150.0416/18

= 8.43 moles.

Thus, the moles of water are needed to react with 100. g of al4c3 - 8.34 moles.

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Answer:

10.98 s

Explanation:

To solve this problem we first use the formula:

Where:

And solve for N:

Then we use the formula:

Where:

And solve for W₀.₅:

Answer:

303.4 millimeters

Explanation:

Just multiply 1.64 by 0.185. then convert that answer to millimeters

Answer:

20.4 miles.

Explanation:

We know he usually rides his bike at 15mph, and if we subtract 3 from that we get 12 miles per hour. Now if we multiply by the amount of time (1.7 hours) we'll find our answer. 12 x 1.7 = 20.4

Answer:

20.4

Explanation:

I just had the question.

Answer:

copper nitrate

Explanation:

copper nitrate

Answer:

Copper (ll) nitrate or C

Explanation:

Answer:

New temperature t2 = [1.28T− 273.15]° C

Explanation:

Given:

Volume v1 = 25 gram

New volume v2 = 25 + 7 = 32 gram

Constant pressure = p

Temperature t1 = T

Find:

New temperature t2

Computation:

Pv1/t1 = Pv2/t2

25 / T = 32 / t2

t2 = 1.28T

New temperature t2 = [1.28T− 273.15]° C

Answer:

answer C) 1 and 4

Explanation:

Answer:

C) 1 and 4

Explanation:

I took the test. Hope this helps!

Answer:

If you heat a gas you give the molecules more energy so they move faster.

Explanation:

Answer:

The temperature of the gas is 876.69 Kelvin

Explanation:

Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:  

P*V = n*R*T

where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas.

In this case:

Replacing:

470 mmHg*0.570 L= 0.0049 moles* 62.36367 [tex]\frac{mmHg*L}{mol*K}[/tex] *T

Solving:

[tex]T=\frac{470 mmHg*0.570 L}{0.0049 moles* 62.36367\frac{mmHg*L}{mol*K} }[/tex]

T= 876.69 K

The temperature of the gas is 876.69 Kelvin

Answer:

There will be no observed impact of adding twice as much Na2CO3 on the product

Explanation:

Stoichiometry gives the relationship between reactants and products in terms of mass, mole and volume.

If we consider the stoichiometry of the reaction, we will discover that the reaction occurs in a 1:1 ratio. This implies that use of twice the amount of Na2CO3 will only lead to an excess of Na2CO3 making the other reactant the limiting reactant. Once the other reactant is used up, the reaction quenches.

Hence, use of twice as much Na2CO3 has no impact on the quantity of product produced.

Answer:

2.273M

Explanation:

What is the definition of molarity.

M = mols/L. So that's what we need to determine.

How much does a L weigh? That's

1.114 g/mL x 1000 mL = 1114 grams. Simple enough, eh?

How much of that 1114 g is H3PO4. It says it is 20% by mass, therefore, 1114 g x 0.20 = 222.8 g.

How many mols are there in 222.8 g H3PO4? That's mools = grams/molar mass = 222.8/98 = 2.273 mols.

The definition of M is what? M = mols/L. And you have 2.273 mol/L; that must be the molarity.

The formula is

density g/mL x 1000 mL x mass% x (1/molar mass) = M

1.114 x 1000 x 0.20 x (1/98) = 2.273 M.

Answer:

29.9 moles

2C²H¹⁰ needs 13 moles of O²

4.6 C⁴H¹⁰ needs X moles of O²

X= 13× 4.6 ÷ 2 = 59.8 ÷ 2 = 29.9 moles

29.9 moles of O2 are required to react completely with 4.6 mol of C4H10.

2C²H¹⁰ needs 13 moles of O²

4.6 C⁴H¹⁰ needs x moles of O²

x= 13× 4.6 ÷ 2

= 59.8 ÷ 2

= 29.9 moles

A mole is described as the quantity of a substance that contains exactly 6.02214076 X1023 primary entities of the given substance. as a result, a mole of a substance is referred to as the mass of a substance containing the equal wide variety of essential gadgets as atoms in exactly 12.000 g of 12C.

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Answer:

A) type of food.

Grams of acetic acid in 500 ml vinegar=39.744 g

Titration (equivalence point⇒mol acid(CH₃COOH)=mol base(NaOH))

M₁V₁n₁=M₂V₂n₂(n=valence acid/base, for CH₃COOH and NaOH=1)

[tex]\tt M_1\times 2.5\times 1=0.0960\times 34.5\times 1\\\\M_1(acetic~acid)=1.3248~mol/L[/tex]

For MW CH₃COOH = 60 g/mol, mass of acetic acid in 1 L :

[tex]\tt 1.3428~mol/L\times 60~g/mol=79.488~g/L[/tex]

for 500 ml :

[tex]\tt 79.488\times 0.5~L=39.744~g[/tex]

The mass of vinegar present in 500mL of solution is 39.6 g.

Concentration of acid (CA) = ?

Volume of acid(VA) = 2.50 ml

Concentration of base (CB) =0.0960 M

Volume of base (VB) =  34.50 ml

Number of moles of acid = 1

Number of moles of base = 1

Equation of the reaction;

CH3COOH (aq) + NaOH(aq) ------> CH3COONa(aq) + H2O(l)

From CAVA/CBVB = NA/NB

CAVANB = CBVBNA

CA = CBVBNA/VANB

CA = 0.0960 × 34.50 × 1/2.50 × 1

CA = 1.32 M

Number of moles = concentration  × volume

Number of moles = 1.32 M × 500/1000

Number of moles = 0.66 moles

Number of moles = mass/molar mass

Mass = Number of moles  × molar mass

Molar mass of acetic acid = 60 g/mol

Mass =  0.66 moles  ×  60 g/mol

Mass = 39.6 g

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Answer:

1 M

Explanation:

The molarity of a solution, M, is a measure of the concentration of that solution and it refers to the number of moles of solute (mol) per liter (L) of solution. The molarity (M) can be calculated using the formula:

M = number of moles (n) /volume (V)

In this question, a 500 ml aqueous solution of Na3PO4 was prepared using 82g of the solute.

Molar mass of Na3PO4 = 23(3) + 15 + 16(4)

= 69 + 31 + 64

= 164g/mol

Mole = mass/molar mass

mole = 82/164

mole = 0.5 mol

Volume in Litres (L) = 500 ml ÷ 1000 = 0.500L

Therefore, Molarity (M) = 0.5/0.500

Molarity = 1 M or 1 mol/L

The molarity of the solution is 1 M

From the question,

We are to determine the molarity of the solution.

First, we will determine the number of moles of the solute (Na₃PO₄) present

Mass of Na₃PO₄ = 82 g

Using the formula

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

Molar mass of Na₃PO₄ = 163.94 g/mol

∴ Number of moles of Na₃PO₄ present = [tex]\frac{82}{163.94}[/tex]

Number of moles of Na₃PO₄ present = 0.500 moles

Now, for the molarity of the solution

Using the formula

[tex]Molarity = \frac{Number\ of\ moles}{Volume}[/tex]

Volume of the solution = 500 mL = 0.5 L

∴ Molarity of the solution = [tex]\frac{0.500}{0.5}[/tex]

Molarity of the solution = 1 M

Hence, the molarity of the solution is 1 M

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Ionic compounds have higher melting point than covalent compounds.

Carbon dioxide have lower melting point (-56.6 °C) among the given compounds.

Melting point is the temperature at which the substance melts into liquid thus at this temperature its solid state and liquid state are in equilibrium. Melting point is depend upon the bond type and mass of the compound.

Ionic bonds are stronger than covalent bonds and hence ionic compounds have higher melting point than covalent compounds. Hence, lithium chloride and calcium bromide have higher melting point.

Silicon is bigger than carbon thus silicon dioxide melts at higher temperature.  Carbon dioxide is purely covalent and melts at negative temperatures.

Hence, the compound with lower melting point here is carbon dioxide thus, option A is correct.

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Answer:

The correct answer is 0.11 L

Explanation:

From the problem, we have the following data:

moles CaCl₂= 0.039 mol

molarity = 0.340 M = 0.340 mol CaCl₂/L

According to this, the solution has 0.340 mol of CaCl₂ in 1 L. If the total number of moles is 0.0369, we can find the volume as follows:

V= moles/molarity = 0.0369 mol x 1 L/0.340 mol = 0.108 L ≅ 0.11 L