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
sergejj [24]
2 years ago
11

Read the list of substances. Spoon, Styrofoam cup, Scissors, Pencil. Which substances are likely to float in water?

Chemistry
2 answers:
finlep [7]2 years ago
5 0

Answer:

D

Explanation:

Bond [772]2 years ago
3 0
Yep, it’s definitely D. The cup and pencil will have a lower density and will therefore float.
You might be interested in
The thermite reaction reacts iron (III) oxide, Fe2O3, with aluminium powder,Al, the form aluminium oxide, Al2O3 and iron, Fe.
lara [203]

Answer:

<u><em>This answer assumes that the strated "16.0g of iron" was meant to be 16.0 grams of iron(III) oxide.</em></u>

Explanation:

To start, the thermite equation must be balanced.

I find:

1Fe2O3 + 2Al = 1Al2O3 + 2Fe

This tells us we need 2 moles of Al for every 1 mole of Fe2O3.  

Now calculate the moles of each reactant:

Moles Fe2O3:  16.0 g/159.7 g/mole = <u>0.100 moles Fe2O3</u>

Moles Al:  8.1 /26.98 g/mole = <u>0.300 moles Al</u>

The balanced equation says that in order to react all of the Fe2O3 we'd need twice that amount (in moles) of the Al.  (0.100 moles Fe2O3)*(2) = 0.200 moles Al.

<u>Which of the two reactants is the limiting reagent?</u>

We have more than enough moles of Al to react with 0.10 moles of Fe2O3.  (We have 0.300 moles Al and all we need is 0.200 moles to react with the 0.10 moles of Fe2O3.  <em>Fe2O3 is the limiting reagent.</em>

<u><em>Calculate the maximum mass of iron of iron that could be formed using these quantities of reactants.</em></u>

The balanced equation tells us that we will obtain 2 moles of Fe for every 1 mole of Fe2O3 consumed.  Since Fe2O3 is the limiting reagent, we will assume that it completely reacts.  That means 0.1 moles of Fe2O3 is reacted.  Since we expect twice that many moles of Fe, we should obtain 0.200 moles of Fe.  At 55.85 g/mole, we should obtain:

(0.200 moles Fe)*(55.85 g Fe/mole Fe) = 11.2 grams Fe

<em></em>

<em></em>

5 0
1 year ago
What type of energy uses turbines
labwork [276]

Answer:

The answer is : D. Wind energy

3 0
2 years ago
A straight piece of wire is coiled to form a spring physical or chemical
STALIN [3.7K]
Physical. you didn't burn it or create a chemical reaction
7 0
3 years ago
If an atom contains 12 protons and 10 neutrons, what's its mass number?
user100 [1]
A = Z + n

A = 12 + 10

A = 22

Answer C

hope this helps!
7 0
3 years ago
13. The attraction between water molecules and an Na+
a_sh-v [17]

Answer:

C) Polar......

:-)

Wish .It's help you.

8 0
2 years ago
Read 2 more answers
Other questions:
  • why does every human measurement have uncertainty associated with it? Why must we manage the uncertainty during calculations?
    13·1 answer
  • What is the definition of physical and chemical properties of matter?
    7·1 answer
  • How do sulfur and phosphorus move from the biotic to the abiotic pools during their cycle?
    15·1 answer
  • Write the equation for changing atmospheric nitrogen and hydrogen to ammonia?
    13·1 answer
  • What combines to form bonds in compounds? A. atoms of elements B. molecules C. types of minerals D. valences
    10·1 answer
  • Calculate the average bond order for a p−o bond (such as the one shown in blue) in a phosphate ion. express your answer numerica
    15·1 answer
  • How many grams of O2 are required to produce 5 mol CO2
    6·1 answer
  • 2. During asexual reproduction in paramecia, a single paramecium becomes two new
    10·1 answer
  • Is this statement true or false?
    6·1 answer
  • What is convection? What happens to heat during it?
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!