CHEMISTRY HIGH SCHOOL

How many mL of 0.100 m NaHCO3 are needed to prepare 750.0ml of a 0.0500 m NAHCo3 solution

Answers

Answer 1
Answer: Following the rule of thumb in dilution, the equation that can be used to solve this problem is:

C1V1 = C2V2

where:
C1 = concentration of solution 1
V1 = volume of solution 1
C2 = concentration of solution 2
V2 = volume of solution 2

(0.1)(V1) = (0.05)(750)
V1 = 375 mL

This shows that 375 mL of a 0.1 m NaHCO3 solution is needed in order to dilute it to a 0.05 m NaHCO3 solution of 750 mL.

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Which of the following is true about the concept of half-life?A. Half-life measures the rate of decay of a radioisotope. B. The shorter the half-life, the more dangerous the radioisotope. C. Half-life predicts which atoms in a radioactive sample will decay. I think it`s A?
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Petroleum and coal can be mined from the continental shelf. t/f

Answers

True

Petroleum and coal can be mined from the continental shelf. Hot magma from inside the Earth seeps out from the crevices in the mid-ocean ridge. There is speculation regarding whether this is a cost-effective technique. Fossil fuels and mineral deposits can be located all throughout the continental shelf and also in some of the deepest depths of the ocean.

Answer:The given statement is true.

Explanation:

Continental Shelf: A portion of continent submerged under the relative shallow ocean water.Most of the gradually slopes down in to the water.

The relatively flat surface and shallow water makes it fitr place to harvest sea food, non renewable energy resources like : coal, petroleum .

Which two elements have the most similar chemical properties?(1) Be and Mg (3) Cl and Ar
(2) Ca and Br (4) Na and P

Answers

Elements in the same groups shows similar chemical and physical properties. The elements having similar chemical properties are Be and Mg.

What are groups?

A group in periodic table is a column with elements of similar physical and chemical properties.

Both beryllium (Be) and magnesium are in group two with two valence electrons and both are metals. They have similar chemical and physical properties.

Cl is in 17th group and Ar is a 18th group element. They do not show any similarity in chemical properties. One is halogen which is unstable and the second one is noble gas which is stable. Thus no similarity.

Ca is a  2nd group element and Br is 17th group and they are different in chemical properties. One is metal and the second one is halogen with higher electronegativity.

Similarly, Na is in first group and P is 15th group element in periodic table in periodic table and does not show chemical similarities.

Therefore, the elements showing similar chemical properties are Be, Mg thus, option 1 is correct.

To learn more about groups in periodic table, refer the link below:

brainly.com/question/13219625

#SPJ5

atoms are made of 3 types of sub atomic particles- protons, neutrons and electrons

from these 3 particles, electrons are responsible for participating in chemical bonds. therefore chemical properties of elements are based on the number of electrons present.

valence electrons are the number of electrons in the outermost energy shell that are involved in chemical bonds.

atoms with same number of valence electrons are grouped in to columns called groups.

therefore elements of the same group have same number of valence electrons, hence similar chemical properties.

from the options given

only Be and Mg belong to the same group they both belong to group 2 with 2 valence electrons

therefore Be and Mg have similar chemical properties

answer is

1) Be and Mg

Based upon the pH scale, a vegetable with a pH of 5.3 would be

Answers

It would not be a base, a base on the pH scale is from 8-14, an acid is from 1-6. There for it would be an acid.
A vegetable with a pH of 5.3 would be base, not acid. One exemple is celery 

Science Experiments: What does Interpretation of Data mean?

Answers


It means you perform the experiment ... maybe several times ... you make
lots of measurements, and you collect a lot of numbers from the experiment. 
Then what have you got ?  You have tons of numbers.  That's your data. 

The numbers don't stand up on the paper and sing like a choir and tell you
the results of the experiment.  Somehow, at some point, YOU have to take
all the numbers, look them over, under, around, and through, from every
possible angle, and decide what the numbers are telling you. 
THAT's the interpretation of the data.
Interpretation is the act of explaining reframing or otherwise showing your own understanding of something. A person who translates one language into another is called an interpreter.

Mass measures the amount of matter in an object

the weight of an object

gravity's effects on an object

the size of an object

Answers

Mass measures the amount of matter in an object... It would be weight that records the gravitational effect on an object.

Determine the pH of a 1x10^-4 M solution of HCl.

Answers

The HCl is a strong acid, that is, it is fully consumed in the reaction.

HCl(aq) ------------> H₃O⁺(aq)   + Cl⁻(aq)
 ↓                                   ↓                    ↓
 1x10⁻⁴ M                      0                    0
-1 x 10⁻⁴                  + 1 x 10⁻⁴      +1 x 10⁻⁴
_____________________________________
0                                 + 1 x 10⁻⁴  M       + 1 x 10⁻⁴  M

PH = - log [ H₃O⁺ ]

PH = - log [ 1 x 10⁻⁴]

PH =  4.0

hope this helps!
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