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
saul85 [17]
3 years ago
10

Help pleaaasee??????????? can u tell me whether it's physical or chemical change

Chemistry
1 answer:
Karo-lina-s [1.5K]3 years ago
5 0
2) chemical
3) chemical
4) physical
5)chemical
6)chemical
7)physical
8)physical
9)physical / chemical
    100% sure
You might be interested in
What is orbital theory of bonding in metals
lianna [129]
Metals of Group 1 donate 1 electron from its ns orbital to form ionic bond, where n is the no. of its outermost shell. 
Metals of Group 2<span> donate 2 electrons from its ns orbital to form ionic bond, where n is the no. </span>of its <span>outermost shell. </span>
5 0
3 years ago
1 What is the approximate altitude of Polaris when viewed from New York City?
77julia77 [94]

Answer:

44° to 45°

Explanation:

The altitude of Polaris star  when viewed from New York City is somewhat between 44° to 45°. However, Polaris is directly overhead at the North Pole (90° of latitude); in other words, the angle between Polaris and the horizon at the North Pole is 90°. This angle is called "the altitude" of Polaris.

6 0
3 years ago
A single atom of an element has 11 protons, 11 electrons, and 12 neutrons. Which element is it? a V b Na c Mg d Se
wel

Answer:

B.  Na

Explanation:

To identify an atom, you simply need to look at the number of protons.  This atom has 11 protons.  On the periodic table, you can see that the element with 11 protons is sodium (Na).

8 0
3 years ago
Which statement describes solstices?
RSB [31]

Answer:

Option A (They happen as the Sun hits its maximum and minimum level throughout the sky) is the correct option.

Explanation:

  • Solstice seems to be the moment whereas at noon this same sun achieved its maximum as well as minimum position, actually results throughout the year's shortest as well as biggest days.  
  • We currently believe that perhaps the solstice seems to be an apocalyptic event, exacerbated either by the tilt of the globe’s axis and therefore its direction of movement in an elliptical orbit. Globe's rotation not everyone's travel time from either the sun was what was causing winter or even just summer.

Some other options given should not be in accordance with the given context. So, the correct approach would've been option A.

7 0
3 years ago
Read 2 more answers
If one starts with pure NO2(g) at a pressure of 0.500 atm, the total pressure inside the reaction vessel when 2 NO2(g) ⇌ 2 NO(g)
Anni [7]

Answer:

The equilibrium partial pressure of NO2 is 0.152 atm

Explanation:

Step 1: Data given

Initial pressure of NO2 = 0.500 Atm

Total pressure inside the vessel at equilibrium = 0.674 atm

Step 2: The balanced equation

2 NO2(g) ⇌ 2 NO(g) + O2(g)

Step 3: The initial pressures

pNO2 = 0.500 atm

pNO = 0 atm

pO2 = 0 atm

Step 4: The pressure at the equilibrium

pNO2 = 0.500 - 2x

pNO = 2x

pO2 = x

Total pressure = 0.674 = (0.500 - 2x) + 2x + x

0.674 = 0.500 + x

x = 0.174

pNO2 = 0.500 - 2*0.174 = 0.152 atm

pNO = 2x = 0.348 atm

pO2 = x = 0.176 atm

The equilibrium partial pressure of NO2 is 0.152 atm

4 0
3 years ago
Other questions:
  • Which best describes an element? A pure substance. A type of a mixture. A pure compound. An impure substance.
    11·2 answers
  • When compared to sulfuric acid, how strong are carboxylic acids? when compared to sulfuric acid, how strong are carboxylic acids
    14·1 answer
  • How does the ionic radius of a nonmetal compare with its atomic radius?
    14·2 answers
  • Which of the following refers to the horizontal rows of the periodic table?
    13·1 answer
  • The acetoacetic ester synthesis is a method for preparing methyl ketones from alkyl halides.
    12·1 answer
  • Na+H2O=NaOH+H2<br> Balancing
    8·1 answer
  • Look at this graph:
    14·1 answer
  • Which example is an exothermic reaction?
    14·2 answers
  • Extend your thinking: The slow decay of radioactive materials can be used to find the age of rocks, fossils, and archaeological
    10·1 answer
  • What is a quantum of light energy called?
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!