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lara [203]
3 years ago
15

Kit wants to see what happens to chocolate chips if they are placed in a bowl and heated in the microwave. Which is likely the m

ost accurate prediction Kit can make about what will happen to the chips? A. When melted, the chocolate will weigh more. B. When melted, the chocolate will take the shape of the bowl. C. Heat will have no effect on the chips. D. When melted, the chocolate will weigh less.
Chemistry
1 answer:
kvasek [131]3 years ago
4 0

B. When melted, the chocolate will take the shape of the bowl.

Explanation:

The chocolate chips are heated in the bowl, they will assume the shape of the bowl or container they are placed in.

  • They simply undergo a phase change from solids to liquids.
  • Solids generally have fixed volume with their rigid shapes.
  • Liquids and gases takes up the shape of the container they are placed in.
  • Baring no loss of chocolate, the weight will remain the same because weight is function of mass and gravity. Gravity will remain the same, and the amount of matter, the mass will also be the same.

Learn more:

Phase change brainly.com/question/1875234

#learnwithBrainly

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Which one of the following classes of organic compound does not contain the carbonyl (C=O) group?A) aldehydesB) carboxylic acids
vredina [299]

Answer: alcohols

Explanation:

The carbonyl group refers to C=O. It is contained in aldehyde, Ketones, carboxylic acids , esters, amides and acyl chlorides. They are not found in alcohols. The alchols are generally ROH. They do not contain any carbon-oxygen unsaturated bond in their structure hence the answer.

3 0
3 years ago
Sperm can be carried by _____ grains. ANSWERSSSSSSSSSSSSSSSSS O spore O stamen O pollen
7nadin3 [17]

What is pollen in the reproduction cycle of flowering plants?

A pollen grain is a microspore containing the male gametophyte, usually reduced to two undivided cells, each with one haploid (n) nucleus. These cells are surrounded by a very resistant wall, the exine, which generally has apertures, zones with less resistance which will allow the germination of the pollen tube.

Explanation of the reproduction cycle (cf diagram above)

A given species produces flowers bearing stamens. According to species, these flowers can be unisexual (stamens only) or bisexual (stamens and carpels).

The stamen anthers include 4 pollen sacs containing sporogenous cells (diploid=2n). These sporogenous cells undergo meiosis, each producing 4 microspores (haploid=n). Two nuclei are then formed by mitosis : the vegetative nucleus and the generative nucleus. The latter divides to form 2 sperms. Simultaneously the wall of the microspores becomes thicker and takes the characteristic shape of the species : it is a pollen grain (see: What are the morphological characteristics of pollen and spore grains?). In the majority of species, the 4 grains (resulting from the 4 microspores) split up into single grains; in some cases, they remain together (tetrad = group of 4 grains). When mature, pollen grains are released by the opening of the anthers.

A pollen grain is aimed at reaching another flower of the same species, bearing carpels. The ovaries contain ovules, in which meiosis occurs, then mitoses. It results in an embryo sac with 8 nuclei, among which an egg cell and 2 central cells. When a pollen grain arrives on another flower (see : How are the spores and pollen grains transported?), it is received by the stigmas.

The pollen grain germinates through an opening of the wall: the vegetative nucleus develops into a pollen tube which is guided by the style to the ovary, then enters the micropyle of an ovule. The pollen tube releases 2 sperm nuclei into the ovule: one of the sperms fuses with the egg cell into a zygote (2n), while the other sperm fuses with central nuclei and gives rise to albumen (= food source). There are generally several ovules in an ovary : each one can be fertilized by a distinct pollen grain.

Each fertilized ovule and its albumen form a seed that will develop into a new individual of this species. hope it works

4 0
3 years ago
Read 2 more answers
The heat of combustion of propane, C3H8 (g) is -2057 kJ/mol. What would be the enthalpy change if enough propane was burned to g
Digiron [165]

Considering the reaction stoichiometry, the enthalpy change if enough propane was burned to give off 12 moles of carbon dioxide gas is 8228 kJ.

The balanced reaction is:

C₃H₈(g) + 5 O₂(g) → 3 CO₂(g) + 4 H₂O(l)

The heat of combustion of propane, C₃H₈, is -2057 kJ/mol. This is, 2057 kJ is released for every 1 mol C₃H<u>₈</u>.

So to determine the enthalpy change if enough propane was burned to emit 12 moles of carbon dioxide, you must take into account the stoichiometry of the reaction.

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

  • C₃H₈: 1 mole
  • O₂: 5 moles
  • CO₂: 3 moles
  • H₂O: 4 moles

Then you can apply the following rule of three: if by stoichiometry 3 moles of CO₂ are produced by 1 mole of C₃H₈, 12 moles of CO₂ are produced by how many moles of C₃H₈?

amount of moles of C_{3} H_{8} =\frac{12 moles of CO_{2}x1 mole of C_{3} H_{8} }{3 moles of CO_{2}}

<u><em>amount of moles of C₃H₈= 4 moles</em></u>

So to determine the enthalpy change, you can apply the following rule of three: If for each mole of C₃H₈ 2057 kJ are released, for 4 moles of C₃H₈ how much heat is released?

Heat released=\frac{4 molesx2057 kJ}{1 mole}

<u><em>Heat released= 8228 kJ</em></u>

The enthalpy change if enough propane was burned to give off 12 moles of carbon dioxide gas is 8228 kJ.

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5 0
3 years ago
Subtracting atomic number from atomic mass will give the number of
faltersainse [42]

Answer:

:)

Explanation:

If we subtract the atomic number from the atomic mass: atomic mass - atomic number = number of protons + number of neutrons - number of protons. Thus we get the number of neutrons present in an atom when we subtract the atomic number from the atomic mass.

8 0
3 years ago
Read 2 more answers
2.5 moles of oxygen react with 3.5 moles of hydrogen according to the following balance equation: 2H2 + 1 O2 —&gt; 2 H2O. What i
mash [69]

Answer:

limiting reactant started with/limiting reactant needed=

= 3.5 mol/3.5 mol=1:1

Explanation:

                                       2H2 +   1 O2 ---> 2 H2O

from reaction                 2 mol      1 mol

given                              3.5 mol    2.5 mol

needed                          3.5 mol    1.75 mol

Excess reactant O2, Limiting reactant H2.

Limiting reactant will be used completely.

So,  limiting reactant started with/limiting reactant needed=

= 3.5 mol/3.5 mol=1:1

3 0
3 years ago
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