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3 years ago

Explain one of the theories on how post-it notes work

Chemistry

1 answer:

alexgriva [62]3 years ago

5 0

The glue molecules stick to the surface molecules like millions of microscopic magnets.
Hope it helps

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How much heat, in kJ, is required to raise the temperature of 50 g of water by 5.53°C? (Round to the nearest 10 kJ, and enter on

Triss [41]

Answer:

$Q=1.16kJ$

Explanation:

Hello,

in this case, the required heat to increase the water by 5.53 °C is computed by using the mass, heat capacity and change in temperature during the process:

$Q=mCp\Delta T$

Thus, for the given data we compute it in kJ:

$Q=50g*4.186\frac{J}{g*\°C}*(5.53\°C)*\frac{1kJ}{1000J} \\\\Q=1.16kJ$

Best regards.

5 0

3 years ago

Using the method of initial rates for the reaction a → b, if the initial concentration of a is doubled and the rate of reaction

zmey [24]

Answer is: reaction is second order with respect to a.
This second order reaction is proportional to the square of the concentration of reactant a.
rate of reaction = k[a]².
k is second order rate constant and have unit M⁻¹·s⁻¹.
Integrated rate law for this reaction: 1/[a]=1/[a]₀ + kt.
t is time in seconds..

4 0

3 years ago

Reasons

tekilochka [14]

Answer:

(1) The two column proof is presented here as follows;

Statement ${}$ Reasons

1. C is the midpoint of $\overline {AE}$ ${}$ Given

B is the midpoint of $\overline {AC}$ ${}$

D is the midpoint of $\overline {CE}$ ${}$

2. AC = CE, AB = BC, CD = DE ${}$ Definition of midpoint

3. AB + BC = AC, CD + DE = CE ${}$ Segment addition postulate

4. CD + DE = AC ${}$ Substitution property of equality

5. AB + BC = CD + DE ${}$ Substitution property of equality

6. BC + BC = CD + CD ${}$ Substitution property of equality

7. 2·BC = 2·CD ${}$ Addition of two identical quantities

8. BC = CD ${}$ Division property of equality

9. BC ≅ CD ${}$ Definition of Congruence

(2) The two column proof for the triangular geometric figure is presented here as follows;

Statement ${}$ Reasons

1. 2·WV = XY; 2·YZ = XW; WV = YZ ${}$ Given

2. 2·WV = 2·YZ ${}$ Multiplication property

3. XY = XW ${}$ Substitution Property

4. XW + WV = XV ${}$ Segment Addition Property

XY + YZ = XZ

5. XW + WV = XV ${}$ Substitution Property

XW + WV = XZ

6. XV = XZ ${}$ Substitution Property

Explanation:

5 0

3 years ago

What type of chemical reaction occurs between silver nitrate (AgNO3) and Copper (Cu)? The equation I was given is 2AgNO3 + Cu —&

Pie

Single displacement is the type of chemical reaction

5 0

4 years ago

Are metal and non-metal elements typically ionically bonded? Explain.

victus00 [196]

Answer: Yes, metals and non-metals forms ionic bonds.

Explanation:

Ionic bond is defined as the bond which is formed by complete transfer of electrons from one atom to another atom.

The atom which looses the electron is known as electropositive atom and the atom which gains the electron is known as electronegative atom. This bond is usually formed between a metal and a non-metal.

For Example: Formation of sodium chloride

Sodium is a metal and is the 11th element of periodic table having electronic configuration of $[Ne]3s^1$

To form $Na^{+}$ ion, this element will loose 1 electron.

Chlorine is a non-metal and is the 17th element of periodic table having electronic configuration of $[Ne]3s^23p^5$ .

To form $Cl^{-}$ ion, this element will gain 1 electron.

By criss-cross method, the oxidation state of the ions gets exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.

So, the compound formed between sodium and chlorine atom is NaCl

Hence, metals and non-metals forms ionic bonds.

8 0

3 years ago