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
Leona [35]
2 years ago
6

Which statement describes a physical change? *

Chemistry
1 answer:
xxMikexx [17]2 years ago
4 0
B. The surface of a silver cup turns black when it is exposed to air.
You might be interested in
How to<br> find the number of proton and neutron
VladimirAG [237]

go to periodic table


look for the element you want


find the atomic number on the top right hand side of the element

atomic number = equal to number of proton.


find atomic mass bottom right hand side of the element


atomic mass - atomic number = neutron


i hope this will help

Na atomic number 11 and mass number 23

protons 11

neutron =23-11=12

7 0
3 years ago
1.034 g of a metal sulfate hydrate (if you have not heard of hydrates, look up online or in your lecture course textbook) was he
OverLord2011 [107]

Answer:

7.54%

Explanation:

A hydrate is a salt that has molecules of water incorporated into the crystals. It is represented by the molecular formula of the salt followed by how many molecules of water it has: XY.nH₂O.

So, the mass of water in the sample will be the difference between the hydrate and the salt without water:

mass of water = 1.034 - 0.956 = 0.078 g

The mass percentage is the mass of water divided by the total mass, and then multiplied by 100%:

(0.078/1.034)x100%

7.54%

3 0
3 years ago
Given the following skeleton equation, what are the coefficients for the chemicals in the reaction? __H20 + __ P4O10 = __ H3PO4
AysviL [449]
6H2O + P4O10 = 4H3PO4
Coefficients: 6, 1, 4
4 0
2 years ago
(ii) Electrons are supplied to the external circuit. How and where is this done?<br> [2]
pentagon [3]

Answer:

The electrons are supplied by the species getting oxidized. They move from anode to the cathode in the external circuit. The external battery supplies the electrons. They enter through the cathode and come out through the anode

7 0
3 years ago
Any help with these questions would help i'm lost
SSSSS [86.1K]

Answer:

1.  31.25 mL

2.  1.98 g/L

3.  0.45 g/mL

Explanation:

For each of the problems, you need to perform unit conversions.  You need to use the information given to you to convert to a specific unit.

1.  You need volume (mL).  You have density (g/mL) and mass (g).  Divide mass by density.  You will cancel out mL and be left with g.

(50.0 g)/(1.60 g/mL) = 31.25 mL

2.  You are given grams and liters.  You need to find density with units g/L.  This means that you have to divide grams by liters.

(0.891 g)/(0.450 L) = 1.98 g/L

3.  You have to find density again but this time with units g/mL.  Divide the given mass by the volume.

(10.0 g)/(22.0 mL) = 0.45 g/mL

5 0
3 years ago
Other questions:
  • Tokyo, Japan is 8817.6 km from California. how many millimeters is this? answer in scientific notation.​
    7·1 answer
  • The reaction of 2-methylbutane with chlorine would yield how many monochloro derivatives (include stereoisomers)?
    13·2 answers
  • There are 25 elements found in living things. How many of these elements are found in some organisms but not all? o 1 O 6 019 o
    14·2 answers
  • How many oxygen molecules are present in 113.97 liters of oxygen gas at stp?
    5·1 answer
  • How did admitting Mendeleev deal with elements that had not yet been discovered
    13·1 answer
  • 1. After clamping a buret to a ring stand, you notice that the set-up is tippy and unstable. What should you do to stabilize the
    5·1 answer
  • What is the molecular formula for a compound that has the empirical formula of hgcl and a molar mass of 472.2g/mol?
    13·1 answer
  • If there is sufficient water in the reaction system, how many grams of KOH can be produced from 22.2 g of K?
    11·1 answer
  • Help Me Please , I'm hopeless
    7·1 answer
  • The waste product given off during photosynthesis is:
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!