CHEMISTRY HIGH SCHOOL

Which of the following is a radioisotope used to date rock formations older than 50,000 years?a. Carbon-14.
b. Uranium-235.
c. Cobalt-69.
d. Carbon-12.

Answers

Answer 1
Answer: You use uranium, carbon 14 half life is such that after 50000 years there won't be much left in the sample.

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Which statement is true because of newtons second law ?a)when the net force on an object increases, the objects acceleration decreases
b)when the net force on an object decreases ,the objects acceleration increases
c)when the net force on an object decreases, the acceleration doesnt change
d)when the net force on an object decreases, the objects acceleration decreases

Answers

Newton's second law, by definition, states that,  The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object. Therefore, based on the given options above, the correct answer would be option D: when the net force on an object decreases, the objects acceleration decreases.

d. when the net force on an object decreases, the objects acceleration decreases


i took the test and got it right

an organic compound on analysis yielded 2.04g carbon, 0.34g hydrogen, 2.73g oxygen. calculate the empirical formula​

Answers

Answer:

CH2O

Explanation:

According to this question:

C = 2.04g

H = 0.34g

O = 2.73g

First, we divide the mass value of each element by its atomic mass to convert to moles.

C = 2.04g ÷ 12 = 0.17mol

H = 0.34g ÷ 1 = 0.34mol

O = 2.73g ÷ 16 = 0.17mol

Next, we divide by the smallest mole value (0.17):

C = 0.17mol = 0.17 = 1

H = 0.34mol ÷ 0.17 = 2

O = 0.17mol ÷ 0.17 = 1

The whole number ratio of C,H,O is 1:2:1, hence, the empirical formula is CH2O.

All isomers of octane have the same(1) molecular formula (3) physical properties
(2) structural formula (4) IUPAC name

Answers

The correct answer is option 1. All isomers of octane have the same molecular formula. Isomers are two or more compounds having the same formula but different arrangement of atoms resulting to different IUPAC name and different properties.

Answer: Option (1) is the correct answer.

Explanation:

When two different molecules represent same molecular formula but different arrangement of atoms then they are known as isomers.

Whereas physical properties are the properties which determines the state of object or substance. That is, property which can be observed.

For example, wood is brown in color.

On the other hand, when arrangement of atoms are represented by the formula of a molecule then it is known as structural formula.

Thus, we can conclude that all isomers of octane have the same molecular formula.

The ___________________ in the mouth secrete enzymes which help prepare the food for digestion in the stomach.a. teeth
B.tongue
C.salivary glands
D.pancreas

Answers

The salivary glands in the mouth secrete enzymes which help prepare the food for digestion in the stomach.

Answer: salivary glands

Explanation:

this is the correction i got 100% correct

The mass spectrum of a sample of a pure element is shown above. Based on the data, the peak at 26amu represents an isotope of which of the following elements? A) Al with 13 neutrons
B) Mg with 14 neutrons
C) Fe with 26 neutrons
D) Ti with 26 neutrons

Answers

The correct answer is option B: Mg with 14 neutrons

The mass spectrum shows the charge to mass ratio of atoms. I can be used to sort the isotopes of an element.

Isotopy is a phenomenon in which atoms of the same element have the same atomic number but different mass numbers.

The mass spectrum of atoms separates atoms on the basis of charge to mass ratio of the isotopes.

The isotopes of magnesium are;  24Mg atom which has 12 neutrons 25Mg which has 13 neutrons, and  26Mg which has 14 neutrons.

Hence, the peak at 26amu represents 26Mg which has 14 neutrons.

brainly.com/question/24160758

Answer:

The answer is B

Is zinc coMpund Plz help me​

Answers

Answer:

it is indeed a compound

Explanation:
Zinc is NOT a compound.

A compound contains two or more elements or molecules like H2O. Where H is 1 element and Oxygen is another and together they make a compound.

Zinc itself is a single molecule (or element) and can be used in a compound like ZnO (zinc oxide)
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