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Vera_Pavlovna [14]
3 years ago
12

For a science experiment, a student rubs a mineral against a porcelain plate. The students has just performed

Chemistry
2 answers:
Gemiola [76]3 years ago
6 0
The correct answer is letter B: A streak test.
frosja888 [35]3 years ago
4 0

B.Streak Test.Hope this helps! :)

You might be interested in
4.5 centimeters= km<br> please help me girl i’m not trying to fail science
finlep [7]

Answer:

4.5cm = 45/1000000 km

or 4.5cm= 4.5×10^-5 km.

4 0
3 years ago
Read 2 more answers
In a test of an automobile engine 1.00 L of octane (702 g) is burned, but only 1.84 kg of carbon dioxide is produced. What is th
Reptile [31]

Answer:

The % yield of CO2 is 85.05 %

Explanation:

Step 1: Data given

Mass of octane = 702 grams

Molar mass octane = 114.23 g/mol

Mass CO2 =1.84 kg = 1840 grams

Molar mass of CO2

Step 2: The balanced equation

2C8H18 + 25O2 → 16CO2 + 18H2O

Step 3: Calculate moles of octane

Moles octane = mass octane / molar mass octane

Moles octane = 702.0 grams / 114.23 g/mol

Moles octane = 6.145 moles

Step 4: Calculate moles of CO2

For 2 moles octane we need 25 moles O2 to produce 16 moles CO2 and 18 moles H2O

For 6.145 moles octane we'll have 8*6.145 moles =49.16 moles

Step 5: Calculate mass of CO2

Mass CO2 = moles CO2 * molar mass CO2

Mass CO2 = 49.16 moles * 44.01 g/mol

Mass CO2 = 2163.5 grams

Step 6: Calculate % yield of carbon dioxide

% yield = (actual yield / theoretical yield)*100%

% yield = (1840/2163.5)*100%

% yield = 85.05 %

The % yield of CO2 is 85.05 %

4 0
3 years ago
When a solid undergoes _____ it takes up less space due to cooling
almond37 [142]

Answer:

solificATION

Explanation:

4 0
3 years ago
Read 2 more answers
What causes a substance to change states of matter?
kolezko [41]
Salutations!

What causes a substance to change states of matter?

Energy causes a substance to change states of matter. A matter needs energy to melt, evaporate, boil. Remember: Energy has a sudden change, but the temperature remains absolutely the same. An example of a change in energy is when ice is melting.

Hope I helped (:

Have a great day!
8 0
3 years ago
I need help with this question ASAP
sladkih [1.3K]

the answer is thermal.......

4 0
3 years ago
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