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
sertanlavr [38]
3 years ago
13

How are elements and compounds are different

Chemistry
1 answer:
navik [9.2K]3 years ago
8 0
AN element is composed from atoms with the same number of protons,
 A compound contain two or more different elements
You might be interested in
What factors affect freezing-point depression of a solution? (select all that apply)
ANTONII [103]

Answer:

A and F i think

Explanation:

Freezing point depression is a colligative property observed in solutions that results from the introduction of solute molecules to a solvent. The freezing points of solutions are all lower than that of the pure solvent and is directly proportional to the molality of the solute

8 0
3 years ago
What is a sentence for weathering
bija089 [108]
These rocks were either roasted or exposed to severe weathering 
7 0
2 years ago
Read 2 more answers
What is the temperature change in 355 mL of water upon absorption of 34 kJ of heat? (The specific heat capacity of water is 4.18
frozen [14]

The temperature change is 23 °C.

<em>q = mC</em>Δ<em>T</em>

Δ<em>T</em> = <em>q</em>/(<em>mC</em>)

<em>m</em> = 355 g

∴ Δ<em>T</em> = (34 000 J)/(355 g × 4.184 J·°C⁻¹g⁻¹) = 23 °C

<em>Note</em>: The answer can have only <em>two significant figures</em> because that is all you gave for the amount of heat absorbed.

7 0
3 years ago
Read 2 more answers
The decomposition of 57.0 g of Fe2O3 results in Consider the following reaction. 2Fe2O3 ---&gt; 4Fe + 3O2 deltaH degree rxn = +
lozanna [386]

Answer:

The correct answer is option E.

Explanation:

2Fe_2O_3\rightarrow 4Fe + 3O_2 \Delta H^o_{rxn} = 824.2 kJ

Mass of ferric oxide decomposed = 57.0 g

Moles of ferric oxide decomposed = \frac{57.0 g}{160 g/mol}=0.35625 mol

According to reaction, 2 moles ferric oxide on combustion gives 824.2 kJ of heat.

Then heat given by on decomposition of 0.35625 mol of ferric oxide will be:

\frac{824.2 kJ}{2}\times 0.35625 =146.81 kJ\approx 147 kJ

So, on decomposition of 57.0 grams of ferric oxide 147 kilo Joules of heat was released.

3 0
3 years ago
When 24g of magnesium metal is heated in air, 40g of magnesium oxide is produced. What mass of magnesium would be needed in orde
inysia [295]

Answer: 6.1 g

Explanation:

between Mg and MgO theres a 1;1 MOLE RATIO

here's the balanced equation

2Mg + O2 ==> 2MgO

24g of magnesium is approximately 1 mole of magnesium so it produces 40 g of mgo which is also 1 mole of mgo thus 10/40 =0.25 moles of MgO so 0.25 moles of magnesium would be needed  which is approximately 6.1 g

6 0
2 years ago
Other questions:
  • Which of the following is NOT a characteristic of most ionic compounds?
    5·1 answer
  • Give the name of the element whose neutral atom tends to have 77 electrons.
    14·1 answer
  • PLEASE HELP WITH ALL
    11·2 answers
  • Seawater is composed of salt, sand, and water. is seawater a heterogeneous or homogeneous mixture? explain
    6·1 answer
  • A gene or trait that appears or expresses itself over a recessive trait is called A. a mutation. B. an influential gene. C. a do
    9·1 answer
  • Please help me ASAP
    10·1 answer
  • water’s molar mass is 18.01 g/mol. The molar mass of glycerol is 92.09 g/mol. At 25 celsius, glycerol is more viscous than water
    9·1 answer
  • ANSWER ASAP
    7·1 answer
  • What are all the possible chemical formulas for-
    8·1 answer
  • PLEASE HELP ASAPP!!!!! WILL MARK BRAINLIEST
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!