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saveliy_v [14]
2 years ago
7

Ms. Pitt set up a classroom demonstration to show what happens when a sample of zinc metal is add a.ed to a flask containing hyd

rochloric acid (HCl). The diagram shows what the students in the classroom observed during the demonstration. The students made two other observations: The flask felt warmer after adding the sample. The sample became smaller over time. Which of the following is NOT an evidence of a chemical reaction in this example.
A. Gas collected in the balloon
B.Temperature of sample is increased
c.Volume of HCl remains the same
D.Size of the zinc has become smaller
Chemistry
2 answers:
Nikolay [14]2 years ago
7 0

Answer:

volume of HCl remains the same

Greeley [361]2 years ago
4 0

Reaction

Zn (s) + 2HCl (aq)  ⇒  ZnCl₂ (s) + H₂ (g)

A. gas H₂ collected: true

B. Every chemical reaction produces or absorbs heat. In chemistry, this effect is described as the enthalpy of a reaction.

This reaction releases heat (exothermic) and causes the temperature to increase: true

C. the volume of HCl will decrease because it reacts: false

D. the size of the zinc metal decreases as it reacts: true

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Oxana [17]
A valid Lewis structure of IF3 cannot be drawn without violating the octet rule.

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5 0
3 years ago
Which type of weathering helped to form barrier islands
Grace [21]

Barrier islands typically have sand in the beach zone and dune field, and mud in the back-barrier. Overwash deposits sand in the back-barrier.

Barrier islands form in three ways. They can form from spits, from drowned dune ridges or from sand bars. Longshore drift is the movement of sand parallel to the shore caused by the angle of the waves breaking on the beach. ... When a storm such as a hurricane digs an inlet through the spit a barrier island is formed.

7 0
3 years ago
The volume of 1.20 lol of gas at 61.3 kPa and 25.0 degree Celsius is
aniked [119]

Answer:

V = 48.5 L

Explanation:

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V = (1.20 mol)(0.082057 L•atm/mol•K)(298.15 K) / 0.60498 atm

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4 0
2 years ago
What are the three characteristics properties of an acid
rjkz [21]
1) when litmus paper is dipped into a acid solution, the litmus paper turns red. 
<span>2) acid reacts with metals to produce hydrogen gas </span>
<span>3) the equation of an acidic substance begins with the letter 'H' such as HCl </span>
4 0
3 years ago
Which step in the scientific method requires you to use your senses to obtain information?
a_sh-v [17]

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