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
Mkey [24]
3 years ago
10

It's Peggy Sue's birthday and she's about to blow out the candles on her cake. Brother Roger stops the party when he shouts: "Lo

ok at that! Chemical and physical changes taking places on your birthday cake!"
How would you respond to Roger?
A) Roger is incorrect. The melting wax is a physical change but there is no chemical change taking place.
B) Roger is correct. Lighting the match is a chemical change and burning the candles is a physical change.
C) Roger is correct. The melting wax is a physical change and the burning candle wick is a chemical change.
D) Roger is incorrect. Only a chemical change is taking place as evidenced by the light and heat of the burning candles.
Chemistry
2 answers:
Mandarinka [93]3 years ago
6 0

The correct answer is C). I really hope this helps yall. Plz mark me as Brainliest. :D

Charra [1.4K]3 years ago
3 0
This example is an controversial matter because melting an candle is considered as both physical change and chemical change because no new substances were made by melting an candle. The final answer is C.
You might be interested in
If an old car burns 0.05 mL oil every mile, How much oil will it burn if driven 100,000 miles? Show your answer in mL and L?.
Irina18 [472]

0.05 * 100000

= 5000ml

= 5L

7 0
3 years ago
Can someone please describe these characteristics from the periodic table? Were looking at the elements F, Cl, S, and NE
Vlad [161]

Once you have identified the limiting reactant, you calculate how much of the other reactant it must have reacted with and subtract from the original amount.

7 0
3 years ago
Explain why it is harder to remove an inner shell electrons than a valence electron from an atom
VMariaS [17]
<span> It makes sense that an inner shell electron would be tougher to remove than a valence electron because the inner shell electron is closer to the positive nucleus of the atom. Seeing as an electron caries a negative charge it would be too attracted to the positive core to leave readily. Also, the inner shell electrons are constantly repelling electrons outside of it's energy level (however the reason these electrons outside innershell energy levels don't simply fly away is the charge of the positive core overcomes the smaller charges of the comparably negligible inner shell electrons, but that repulsion is still there so keep that in mind) </span>
6 0
3 years ago
Limiting Reactant Worksheet
faltersainse [42]

Answer:

a) 1.61 mol

b) Al is limiting reactant

c) HBr is in excess

Explanation:

Given data:

Moles of Al = 3.22 mol

Moles of HBr = 4.96 mol

Moles of H₂ formed = ?

What is limiting reactant =

What is excess reactant = ?

Solution:

Chemical equation:

2Al  + 2HBr  → 2AlBr + H₂

Now we will compare the moles:

                Al              :               H₂

                  2              :               1

                 3.22         :            1/2×3.22 = 1.61 mol

                HBr            :              H₂

                 2                :               1

                4.96            :          1/2×4.96 = 2.48 mol      

The number of moles of H₂ produced by Al are less it will be limiting reactant while HBr is present in excess.

Moles of H₂ :

Number of moles of H₂ = 1.61 mol

6 0
3 years ago
Which statement describes vascular plants?
alexandr1967 [171]

Answer:

A vascular plant is any one of a number of plants with specialized vascular tissue. The two types of vascular tissue, xylem and phloem, are responsible for moving water, minerals, and the products of photosynthesis throughout the plant.

Explanation:

7 0
3 years ago
Other questions:
  • Which of the following is an example of a homogeneous mixture?
    7·2 answers
  • What is used to kill cavities
    12·1 answer
  • What is the role of the activated complex in a chemical reaction?
    7·1 answer
  • 1. SEP Develop Models Develop a model to show the chemical potential energy of
    5·1 answer
  • A waterbed filled with water has the dimensions 8.5ft by 7.5ft by 9.5inches. Taking the density of water to be 1.00 g/cubic cent
    5·1 answer
  • The state of matter in which a material has definite shape and definite<br> volume is the
    14·1 answer
  • Ammonia can be made by reaction of water with magnesium nitride as shown by the following unbalanced equation: Mg3N2(s) + H2O(l)
    12·1 answer
  • How many hydrogen atoms are found in 3H2CO3?
    11·1 answer
  • Help pls pls pls I really need this answer
    14·1 answer
  • Which statement about bonding is correct? (1 point)
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!