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
nadya68 [22]
3 years ago
9

Alan wants to identify an unknown solid compound. Which statement correctly describes a method he could use to identify the comp

ound?
A: he could find the temperature at which the compound melts because pure substances have definite melting points

B: he could find the mass of the sample because pure substances have definite masses

C: he could use a mesh screen to filter out the different elements that make up the compound

D: he could melt the compound because melting allows the elements of a compound to seperate
Chemistry
1 answer:
vfiekz [6]3 years ago
8 0

A: he could find the temperature at which the compound melts because pure substances have definite melting points

You might be interested in
What is an orbital?
juin [17]

Answer:

Relating to orbit or orbits

Explanation:

6 0
3 years ago
Read 2 more answers
What are genes?
ss7ja [257]

C) the basic unit of inheritance

3 0
3 years ago
Answer the following questions based on the reaction below: NaOH(aq) + KHP(s) --> NaKP(aq)+H2O(I)
Natali [406]

Answer:

<u />

  • <u>a) 1.44g</u>

<u />

  • <u>b) 77.3%</u>

<u />

Explanation:

<u>1. Chemical balanced equation (given)</u>

       NaOH(aq)+ KHP(s)\rightarrow NaKP(aq)+H_2O(l)

<u>2. Mole ratio</u>

1molNaOH(aq):1molKHP(s)

This is, 1 mol of NaOH will reacts with 1 mol of KHP.

<u />

<u>3. Find the number of moles in 72.14 mL of the base</u>

    Molarity=\text{number of moles of solute}/\text{volume of solution in liters}

    \text{Volume of solution}=72.14mL=0.07214liters

     \text{Number of moles of NaOH}=0.0978M\times 0.07214liter=0.007055mol

<u>4. Find the number of grams of KHP that reacted</u>

The number of moles of KHP that reacted is equal to the number of moles of NaOH, 0.007055 mol

Convert moles to grams:

  • mass = number moles × molar mass = 0.007055mol × 204.23g/mol
  • mass = 1.4408 g.

You have to round to 3 significant figures: 1.44 g (because the molarity is given with 3 significant figures).

<u>5. Find the percentage of KHP in the sample</u>

The percentage is how much of the substance is in 100 parts of the sample.

The formula is:

  • % = (mass of substance / mass of sample) × 100

  • % = (1.4408g/ 1.864g) × 100 = 77.3%
7 0
3 years ago
Is LiOH soluble or insoluble
Effectus [21]
 It is soluble in water and slightly soluble in ethanol.
6 0
3 years ago
How many grams of NH4ClO4 would dissolve in 250 mL at 30 C
baherus [9]
Ammonium perchlorate appears as a white, crystalline solid or powder. Classified as a division 1.1 explosive if powdered into particles smaller than 15 microns in diameter or if powdered into larger particles but thoroughly dried. Does not readily burn, but will burn if contaminated by combustible material. May explode under prolonged exposure to heat or fire. Used to make rocket propellants, explosives, pyrotechnics, as an etching and engraving agent, and in analytical chemistry.
8 0
3 years ago
Other questions:
  • A compound contains 39.0% potassium, 1.01% hydrogen, 12.0% carbon and 47.9% oxygen. Find its empirical formula
    11·1 answer
  • What is the mass, in grams, of 1.30×1021 molecules of aspirin, C9H8O4?
    7·2 answers
  • Can you tell whether a substance is a mixture, compound, or element
    8·1 answer
  • What is the term?
    14·1 answer
  • What electron transition represents a gain of energy?
    14·1 answer
  • A sample of milk kept at 25 °C is found to sour 40 times as rapidly as when it is kept at 4 °C. Estimate the activation energy f
    12·1 answer
  • What is the mass, in grams, of one mole of any substance known as?
    14·1 answer
  • Which situation best represents convection
    6·1 answer
  • Balance equation of calcium carbonate+water​
    7·2 answers
  • Since volume and temperature are constant, this means that pressure and_____are____proportional. the sample with the largest____
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!