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patriot [66]
1 year ago
9

Help asap!!! Is this true or false please help!!

Chemistry
1 answer:
alexgriva [62]1 year ago
7 0
I have to write at least 20 characters lol. The answer of your problem is true!!
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Stacy reads that a 50:50 mixture of methanol and water is best for keeping a car’s radiator from freezing when the temperature g
salantis [7]
1. The hypothesis for this is experiment is that the 50:50 of methanol-water mixture will not turn to solid when the temperature reaches to -40°C.

2. The procedure for this is measuring equal volumes of water and methanol using the graduated cylinder. You can measure 100 mL of water and 100 mL of methanol using the graduated cylinder. Then, mix them in the beaker. Next, measure 200 mL of water, and another 200 mL of methanol. Don't mix them. Also, make a 60:40 mixture by measuring 120 mL of water and 80 mL of methanol, then mix them together. Place them all in the refrigerator at the same time. Record the time when they would freeze to solid.

3. The controls for this experiment are the 200 mL water alone, and the 200 mL methanol alone.

4. The independent variable in here is the time, while the dependent variable is the temperature of the mixtures.

5. If the hypothesis turns out to be true, then all the mixtures prepared should freeze and become solid after a certain period of time, with the exception of the 50:50 mixture. The 50:50 mixture should still remain as a liquid even when left overnight.
5 0
3 years ago
Read 2 more answers
Assume that you did the following dilutions
MrMuchimi
Below is the solution. I hope it helps. 

CfVf = CiVi 
<span>Cf = (CiVi)/ Vf </span>

<span>i. Cf = [ (10^-6 mol / L) (1 mL) (1L / 1000 mL) ] / [ (1kL) (1000L / 1 kL) ] = 1x10^-12 M → use as Ci in next dilution </span>
<span>ii. Cf = 1x10^-19 M → use as Ci in next dilution </span>
<span>iii. Cf = 1x10^-22 M </span>
6 0
3 years ago
Read 2 more answers
. What’s the empirical formula of a molecule containing 65.5% carbon, 5.5% hydrogen, and 29.0%
Mkey [24]

Answer:

3 moles of carbon, 3 moles of hydrogen and 1 mole of oxygen

3 0
3 years ago
Elements of modern periodic table are arrang in ---Group 2A elements are called ------ and group 7A element table are called....
pentagon [3]

Answer:

c) atomic number / alkaline earth metals/ and halogens

Explanation:

Elements of modern periodic table are arrang in atomic number; for its electron configuration and its chemical properties. This arrangement shows periodic trends.

Alkaline earth metals are a group of elements that are located in group 2 of the Periodic Table and are the following: Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), Barium (Ba) and Radio (Ra).

The Halogens are the chemical elements that form group 17 (XVII A, previously used) or group VII A of the periodic table: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At) and teneso (Ts)

8 0
4 years ago
A student wrote a chemical equation as shown.
borishaifa [10]

<u>Answer:</u> The student must add 2 infront of both H_2O and SO_2 to make the equation balanced.

<u>Explanation:</u>

A balanced chemical equation is one where all the individual atoms are equal on both sides of the reaction. It follows the law of conservation of mass.

For the given unbalanced chemical equation:

2H_2S+3O_2\rightarrow H_2O+SO_2

<u>On the reactant side:</u>

Atoms of H = 4

Atoms of S = 2

Atoms of O = 6

<u>On the product side:</u>

Atoms of H = 2

Atoms of S = 1

Atoms of O = 3

To balance the equation, a student must balance the atoms by adding 2 infront of both H_2O and SO_2

For the balanced chemical equation:

2H_2S+3O_2\rightarrow 2H_2O+2SO_2

6 0
3 years ago
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