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
deff fn [24]
2 years ago
6

Manny and Eva are dissolving sugar in 10 milliliters (mL) of water. They discover that more sugar dissolves in warmer water. In

order for their results to be confirmed, another group must get the same results. Which list contains tools needed to confirm Manny and Eva’s experimental results?
a) beaker, test tube, stopwatch


b) microscope, glass slide, probe


c) beaker, hand lens, eye dropper


d) graduated cylinder, thermometer, balance
Chemistry
1 answer:
HACTEHA [7]2 years ago
8 0

Answer:

a

Explanation: cause

You might be interested in
A car engine produces 604 kJ of mechanical energy from fuel capable of producing 2416 kJ of energy. The efficiency of the engine
Anna71 [15]
I think it’s 40% but I’m not sure
6 0
3 years ago
PLEASEEE HELPPPP I WILL AWARD BRAINLIEST
vampirchik [111]
Yesssirrrrrrrrr someone answer
3 0
3 years ago
When precipitation falls in summer, sometimes wind pushes it back up into freezing temperatures before falling again. What will
SVETLANKA909090 [29]

Answer:

A

Explanation:

hail will fall push it back up making it bigger comes back down

3 0
3 years ago
55 L of a gas at 25oC has its temperature increased to 35oC. What is its new volume?
ladessa [460]

Answer:

Approximately 56.8 liters.

Assumption: this gas is an ideal gas, and this change in temperature is an isobaric process.

Explanation:

Assume that the gas here acts like an ideal gas. Assume that this process is isobaric (in other words, pressure on the gas stays the same.) By Charles's Law, the volume of an ideal gas is proportional to its absolute temperature when its pressure is constant. In other words

\displaystyle V_2 = V_1\cdot \frac{T_2}{T_1},

where

  • V_2 is the final volume,
  • V_1 is the initial volume,
  • T_2 is the final temperature in degrees Kelvins.
  • T_1 is the initial temperature in degrees Kelvins.

Convert the temperatures to degrees Kelvins:

T_1 = \rm 25^{\circ}C = (25 + 273.15)\; K = 298.15\; K.

T_2 = \rm 35^{\circ}C = (35 + 273.15)\; K = 308.15\; K.

Apply Charles's Law to find the new volume of this gas:

\displaystyle V_2 = V_1\cdot \frac{T_2}{T_1} = \rm 55\;L \times \frac{308.15\; K}{298.15\; K} = 56.8\; L.

8 0
3 years ago
A substance is analyzed and found to contain 85.7% carbon and 14.3% hydrogen by weight. A gaseous sample of the substance is fou
atroni [7]

Answer:

The empirical formula of the compound is CH2

Explanation:

<u>Step 1:</u> Data given

A substance contains 85.7 % carbon and 14.3 % hydrogen.

The substance has a density of 1.87 g/L

1 mol occupies 22.4 L

Molar mass of carbon = 12 g/mol

Molar mass of hydrogen = 1.01 g/mol

<u>Step 2</u>: Calculate molar mass of the substance

Since 1 mol occupies 22.4 L;

1 mol of this substance = 1.87g/L *22.4 = 41.888 grams

This means the molar mass of the substance is 41.888 g/mol

<u>Step 3:</u> Calculate mass of carbon:

85.8 % is carbon

this means 41.888 * 0.858 = 35.94 grams

<u>Step 4: </u>Calculate moles of carbon

moles C = mass C/ Molar mass C

Moles C = 35.94 grams / 12 g/mol

Moles C = 2.995 moles

<u>Step 5:</u> Calculate mass of hydrogen:

14.3 % is hydrogen

this means 41.888 * 0.143 = 5.99 grams

<u>Step 6 :</u>Calculate moles of hydrogen

Moles H  = 5.99 grams / 1.01 g/mol

Moles H = 5.93 moles

<u>Step 7: </u>Calculate  mol ratio

Ratio C:H = 1:2

The empirical formule = CH2

<u>Step 8</u>: calculate molar formule

Molar mass of empirical formule = 14.02 g/mol

n = Molar mass of substance / molar mass of empirical formule

n = 41.888 / 14.02 = 3

This means we have to multiply the empirical formula by 3

3*(CH2) = C3H6

C3H6 can be propene or cyclopropane

5 0
3 years ago
Other questions:
  • What is the mass (in grams) of 9.83 × 1024 molecules of methanol (CH3OH)?
    9·1 answer
  • A potassium atom can achieve a stable octet by
    15·1 answer
  • The air we breathe is not considered by chemists to be an element. why not
    7·2 answers
  • A solution of hydrofluoric acid, HF(aq), is at equilibrium. How would the system change if more HF were added to the solution?
    7·2 answers
  • Most elements will have the same number as what?
    10·1 answer
  • Ummmm!! Can somebody please help me answer this question
    6·2 answers
  • 10) In the image below, Melting (D) and Evaporation (E) are shown. What is occurring during these phase changes? *
    15·1 answer
  • Using a lattice structure of sodium chloride, explain why sodium chloride:
    12·2 answers
  • What will the subscript for NH4 be?
    13·1 answer
  • Calculate the mass of atoms of carbon and 3 molecules of hydrogen​
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!