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
marysya [2.9K]
3 years ago
8

PLEASE HELP ME ASAP: Some students are using samples of different substances for a lab investigation. They plan to observe the p

hysical properties of each substance and record their observations in a table like the one below.
Which of the substances observed are elements?

Chemistry
1 answer:
marin [14]3 years ago
3 0

Answer: S,Fe,O2,Sr, and Al

Explanation: I saw it on quizlet

You might be interested in
Which statement gives a reason why scientist think that the universe began with an explosion
yaroslaw [1]

I believe the answer is

At the moment it is the best way of explaining our scientific knowledge.


8 0
3 years ago
How many moles of electrons must be transferred to plate out 110 g of manganese (MW ~ 55g/mol) from a solution of permanganate (
ololo11 [35]

Answer:

14 mol e⁻

Explanation:

Step 1: Write the balanced half-reaction for the reduction of permanganate to manganese

8 H⁺(aq) + 7 e⁻ + MnO₄⁻(aq) ⇒ Mn(s) + 4 H₂O(l)

Step 2: Calculate the moles corresponding to 110 g of manganese

The molar mass of Mn is 55 g/mol.

110 g × 1 mol/55 g = 2 mol

Step 3: Calculate the number of moles of electrons needed to produce 2 moles of Mn

According to the half-reaction, 7 moles of electrons are required to produce 1 mole of Mn.

2 mol Mn × 7 mol e⁻/1 mol Mn = 14 mol e⁻

8 0
3 years ago
What can humans do to reduce climate change
yanalaym [24]

Answer:

Ten possibilities for staving off catastrophic climate change ... What can one person, or even one nation, do on their own to slow and reverse climate change? ... could reduce greenhouse gas emissions to safer levels—there are ... mode of transport that does not require anything other than human energy.

Explanation:

6 0
3 years ago
Read 2 more answers
Overall do you think photosynthesis is endothermic or exothermic
blondinia [14]

Answer:

Endothermic hope that helps

Explanation:

6 0
3 years ago
Which of the following best describes what happens when molecular compounds melt? A.) Molecules separate into their component at
Semenov [28]
I think the correct answer from the choices listed above is option D. When a molecular compound melts, they undergo the process of phase change from solid to liquid therefore m<span>olecules arranged in a regular pattern change to an irregular pattern. Hope this answers the question.</span>
3 0
3 years ago
Other questions:
  • 2. A block of material has a volume of 2 m3. It has a mass of 1 × 104 kg. Calculate the density of the material sample and expre
    7·1 answer
  • One of the isotopes of sulfur is represented as sulfur-35 or S-35. What does the number 35 signify?
    6·2 answers
  • Can u see water vapour by a microscope?
    6·2 answers
  • Which elements always have 11 protons on the periodic table ​
    5·2 answers
  • Solid carbon (C) can burn in oxygen (O2). Select
    6·2 answers
  • Why radicals are highly reactive?
    12·1 answer
  • amount of energy released, which is represented by the ccc Energy and Matter the surface of the sun is at a temperature of about
    5·1 answer
  • A cube of metal has a mass of 5.05 x 10°g and its density is known to be 12.77 g/mL, what is the volume of this metal?
    12·1 answer
  • What is the concentration of hydrogen ions in a solution of KOH with a pOH of 1.72?
    14·1 answer
  • Need asap thank you
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!