What change occur when a substance changes form,shape or phase but it's identity remains the same

Answers

Answer 1

Answer: This change is known as a physical change where the substance changes its form, shape or phase but the identity remains the same. The change only affects the form of a substance but not the composition. Examples are melting ice, boiling water, and tearing a paper.

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In the following reaction, how many grams of NaBr will produce 244 grams of NaNO3? Pb(NO3)2(aq) 2 NaBr(aq) PbBr2(s) 2 NaNO3(aq) The molar mass of NaBr is 102.9 grams and that of NaNO3 is 85 grams
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The chart shows the path reactants take to become products. Which statement best describes the chart? A. Heat was removed from the activation energy to create the product. B. Heat was added to create the product. C. The products have less energy than the reactants. D. The products have the same energy as the reactants.

Answers

Answer:

Explanation:

The final position of the curve is higher than the original height of the curve, meaning the products have more energy than the reactants.

Hence energy was added for the reactants to become the products. This is why the reaction is endothermic, because the products retained some of the supplied energy.

Part of the energy supplied was used to overcome the activation energy (the peak of the curve). However, this extra energy is recuperated as heat once the product is formed.

Answer:

B-

Heat was added to create the product

Explanation:

Just did the quiz on edg

What is free-fall acceleration near earth's surface

Answers

free fall is when the only force acting on an object is gravity

Near Earth's surface, the distance between the object that is falling and the center of Earth does not change very much. Thus, the force given by the law of universal gravitation depends only on the mass of the object that is falling.

What is the oxidation number for sodium?A
2-
B
1+
C
2+
D
1-

Answers

Answer:

B.) 1+

Explanation:

To obtain a full outer electron shell, sodium must lose one electron, leaving it with a plus one charge.

what volume of a 0.716 m kbr solution is needed to provide 25.5 g of kbr? 35.7 ml 14.7 ml 299 ml 0.299 ml 153 ml

Answers

Answer:

$\huge{ \boxed{299 \: ml}}$

Explanation:

The volume of KBr required can be found by using the formula;

$v = (m)/(M * c)$

c is the concentration in M , mol/dm³ or mol/L

v is the volume in L or dm³

m is the mass in grams

M is the molar mass in g/mol

From the question;

m = 25.5 g

c = 0.716

Molar mass (M) of KBr = 39 + 79.9 = 118.9 g/mol

$\therefore \: v = (25.5)/(118.9 * 0.716) \n = 0.299 \: l \n \n \text{but} \: 1 \: l \: = 1000 \: ml \n \therefore0.299l \: = (0.299)/(1) * 1000 \: ml \n = 299 \: ml \n \therefore \: v = 299 \: ml$

The maximum energy available for useful work from a spontaneous reaction(A) free energy
(B) lattice energy
(C) kinetic energy
(D) activation energy
(E) ionization energy

Answers

The answer is: A; Free Energy

Which molecule is amphoteric?A.
NH4+

B.
H2O

C.
H2CO3−

D.
H2SO4

Answers

Answer:

The answer is B

Explanation:

Answer:

B. H2O

Explanation:

Well, for one example, we know that water is amphoteric... Examples: H2O can become H3O+ or OH-. HCO3- can become CO3^2- or H2CO3

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