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3 years ago

Which two statements are scientific claims?

Chemistry

1 answer:

Vilka [71]3 years ago

8 0

Answer:

D and C

Explanation:

The polar ice caps are made of ice.

Planets do not affect people, nor do star signs.

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The empirical formula of a compound is ch. it's molar mass is 52.07 g/mole. What is its molecular formula

Rina8888 [55]

For this item, we find first the mass of the compound with the empirical formula. That is,
molar mass = 12 (for C) + 1 (for H)
= 13 g/mole
Then, we divide the given mass of the molecular formula by the mass of the empirical formula.
n = 52.07 / 13 = 4
Therefore, the molecular formula is C₄H₄.

8 0

4 years ago

A compound that is composed of only carbon and hydrogen contains 80.0% c and 20.0% h by mass. What is the empirical formula of t

gladu [14]

<u>Solution</u> : Emperical Formula = $CH_{3}$

Emperical Formula - A formula that gives the simplest whole number ratio of atom in a compound.

In the question percentages are given then assume that the total mass is 100grams so that the mass of each element is equal to the percentage given.

Given : 80.0g Carbon

20.0g Hydrogen

First convert the given masses into moles.

$80.0g\text{ C} \times \frac{1 g/mole \text{ C}}{12.0 g/mole \text{ C}}= 6.66\text{mole of C}$

$20.0g\text{ H} \times \frac{1 g/mole \text{ H}}{1 g/mole \text{ H}}= 20.0\text{mole of H}$

Value of each mole divided by the smallest number of moles and then round off.

Moles ratio of the element are

$\frac{6.66}{6.66}\text{mole of C}= 1$

$\frac{20.0}{6.66}\text{mole of C}= 3$

This is the mole ratio of the elements and is repersented by the subscript in the emperical formula.

Emperical Formula = $CH_{3}$

3 0

3 years ago

How do properties move if in solid

Schach [20]

Answer:

In the solid phase, the forces of attraction have completely overcome molecular motion, and the movement of the particles has been reduced to vibrating in place. The particles cannot move past one another and are held in a tightly-packed pattern, so there is very little space between the particles.

5 0

3 years ago

If a basketball travels a distance of 4 meters in 5 seconds, what is its average speed?

creativ13 [48]

Answer:

i think d

Explanation:

7 0

3 years ago

If a student has 50.0 mL of a solution of 0.100 M HCI, how could they make a solution with a concentration of 0.0500 M?

vfiekz [6]

Answer:

100 ml

Explanation:

c1×v1=c2×v2

50(0.100)=0.0500(v2)

5=0.0500(v2)

5/0.0500=0.0500/0.0500(v2)

100= v2

5 0

3 years ago