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Fittoniya [83]
3 years ago
10

2. Matter can be described and classified by its observable properties. One property of solids, liquids, and gasses is they all

have volume. Which statement best defines the volume of an object?
A. The amount of space that matter occupies
B. The amount of matter in an object
C. The measure of the force of gravity on an object
D. The number of grams in one cubic centimeter
3.When matter changes from a solid to liquid or from liquid to gas, what kind of change takes place?
A.Chemical change
B. Physical change
C. Thermal change
D. Energy change
4. Darius tears a page of newspaper into pieces to start a campfire. What kind of changes taking place as the paper is torn?
A. A change in matter
B. A change in the substance
C. A change in physical property
D. A change in chemical property
5. Mina is attending cooking school, where she prepares a different mixtures of ingredients. She works with homogenous and homogenous mixtures. Today she is using honey and salsa. What kind of mixtures are these ingredients?
A.Neither is a mixture.
B. They’re both homogenous
C. One is homogenous and the other is heterogeneous.
D. They are both heterogeneous.
When a substance has large or strongly extracted particles, they do not flow freely. For example, water flows very quickly compared to honey. Which property of liquids does the example illustrate?
A. Surface tension
B. viscosity
C. Amorphousness
D. Crystallinity
Chemistry
1 answer:
MaRussiya [10]3 years ago
3 0
Your answer should be C , C , A, D
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Answer:

ΔHrxn = -635.14kJ/mol

Explanation:

We can make algebraic operations of reactions until obtain the desire reaction and, ΔH of the reaction must be operated in the same way to obtain the ΔH of the desire reaction (Hess's law). Using the reactions:

(1)Ca(s) + 2 H+(aq) → Ca2+(aq) + H2(g) ΔH = 1925.9 kJ/mol

(2) 2H2(g) + O2 g) → 2 H2O(l) ΔH = −571.68 kJ/mole

(3) CaO(s) + 2 H+(aq) → Ca2+(aq) + H2O(l) ΔH = 2275.2 kJ/mole

Reaction (1) - (3) produce:

Ca(s) + H2O(l) → H2(g) + CaO(s)

ΔH = 1925.9kJ/mol - 2275.2kJ/mol = -349.3kJ/mol

Now this reaction + 1/2(2):

Ca(s) + ½ O2(g) → CaO(s)

ΔH = -349.3kJ/mol + 1/2 (-571.68kJ/mol)

<h3>ΔHrxn = -635.14kJ/mol</h3>
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The density of water is 1 g/cm3(1 gram per cubic centimeter); using this fact as a reference &amp; Table c , how would you deter
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Answer:

Explanation:

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The scientist that performed the cathode ray experiment leading to the discovery of electrons is J.J. Thomson.

<h3>What is a cathode ray?</h3>

A cathode ray is a tube that contains negatively charged electrode( that is the cathode) which emits electrons when heated at a low pressure.

The cathode ray was used by the scientist, J.J. Thomson to find the ratio of charge to mass (e/m) of the electrons.

Therefore, the scientist that performed the cathode ray experiment leading to the discovery of electrons is J.J. Thomson.

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