1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ioda
3 years ago
12

PLS HELP I NEED TO PASS THIS... In physical science lab, Kim and Dawn added small pieces of magnesium to hydrochloric acid. They

observed that bubbles formed, the test tube got hot, and the magnesium disappeared. What is a sign that a chemical reaction has taken place in this experiment?
Question 7 options:


A.odor


B.gas is produced


C.temperature decreased


D.magnesium appeared
Chemistry
1 answer:
Bond [772]3 years ago
8 0

B gas is produced is the answer.


You might be interested in
What dose science do
Elan Coil [88]

Science is a systematic and logical approach to discovering how things in the universe work. It is also the body of knowledge accumulated through the discoveries about all the things in the universe

╰(^3^)╯

5 0
3 years ago
Read 2 more answers
Phosphorus pentachloride reacts with water to form hydrochloric acid and phosphoric acid. How many total moles of acid are forme
klio [65]

Answer:

0,13 moles of acid are produced

Explanation:

The reaction of the problem is:

PCl₅ + 4H₂O → 5HCl + H₃PO₄

Based on the reaction, 1 mole of PCl₅ produces 6 moles of acid (5 moles of HCl + 1 mole of H₃PO₄).

The molecular mass of PCl₅ is:

1P = 30,97g/mol + 5Cl = 5×35,45g/mol = <em>208,24 g/mol</em>

That means 4,5g of PCl₅ are:

4,5g PCl₅×(1mol / 208,24g) = 0,0216 moles of PCl₅. As 1 mole of PCl₅ produces 6 moles of acid, 0,0216 moles of PCl₅ produce:

0,0216 moles PCl₅ × (6 moles acid / mole of PCl₅) =

<em>0,13 moles of acid are produced</em>

I hope it helps!

3 0
3 years ago
Which isotope is appropriate for dating rocks that are billions of years old
Dominik [7]
I did the test and the answer is C.
4 0
3 years ago
Read 2 more answers
At what temperature and pressure can all three phases of water exist simultaneously?
Rzqust [24]
Thirty seven I think
8 0
3 years ago
Read 2 more answers
suppose you want to do an experiment to hear how three different objects would sound when you dropping them the same distance. y
hodyreva [135]
The variable would be the distance you dropped them.

8 0
3 years ago
Other questions:
  • Which substance can be described as cations bonded together by mobile electrons?A) Ag(s)
    8·1 answer
  • When dry ice goes from a solid straight to a gas, it is known as a(n):
    13·1 answer
  • How many moles of KCl would be dissolved in 4 L of water to make a 2 M solution?
    5·1 answer
  • Whats the difference between speed and velocity
    14·1 answer
  • Internal energy is defined as_________.
    13·1 answer
  • A storm that stays longer over coasts is a more dangerous storm. Is this statement true or false?
    8·2 answers
  • In the event that a chemical gets in your eye while in the lab, you would use the eyewash station. In your at-home lab, however,
    7·1 answer
  • Balance the following equation. <br> C + H2 + 02 → C2H60
    13·2 answers
  • Ability to react chemically
    12·1 answer
  • thủy phân hoàn toàn 11,44 gam este no,đơn chức , mạch hở X với 100ml dung dịch NaOH 1,3M ( vừa đủ ) thu được 5,98 gam một ancol
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!