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Helga [31]
3 years ago
12

Which of the following words mean ä substance formed by chemically combining two or more elements

Chemistry
2 answers:
nlexa [21]3 years ago
5 0
I think it is B compound
kogti [31]3 years ago
3 0

Answer:

B. Compound

Explanation:

Hope I helped

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Suppose that you add 24.3 g of an unknown molecular compound to 0.250 kg of benzene, which has a K f of 5.12 oC/m. With the adde
pochemuha

Solution :

We know that :

$\Delta T_f = k_f.m$  and   $m=\frac{w_2}{m_2 \times w_1}$

Then, $\Delta T_f = k_f.\frac{w_2}{m_2.w_1}$   ..................(1)

Where,

w_1 = amount of solvent (in kg)

w_2 = amount of solute (in kg)

m_2 = molar mass of solute (g/mole)

m = molality of solution (mole/kg)

Given :

\Delta T_f = 3.14\ ^\circ C,   k_f= 5.12\ ^\circ C/m

                              =5.12 \ ^\circ C/mole/kg

                              =5.12 \ ^\circ C \ kg/mole

w_1 = 0.250 kg,  w_2 = 24.3 g

Then putting this values in the equation is (1),

$3.14 = \frac{5.12 \times 24.3}{m_2 \times 0.250}$

$m_2 = \frac{5.12 \times 24.3}{3.14 \times 0.250}$

m_2= 158.49  g/mole

So, the molar mass of the unknown compound is 158.49 g/mole.

7 0
3 years ago
Quartz (sio2) is a solid with a melting point of 1550°c. the bonding in quartz is best described as
yawa3891 [41]
The answer to this question would be: covalent bond

Silicon dioxide or SiO2 is made of silicon which is a metalloid and oxygen which is a gas. The bond that the molecule made is a polar covalent bond because silicon is not a real metal. Silicon dioxide is a polymorph that has many different kinds of crystal form.
3 0
3 years ago
Read 2 more answers
An electron transport chain pumps __________ across a membrane while transferring __________ from one chemical to another. View
timama [110]

Answer:

The correct option is: protons; electrons

Explanation:

The electron transport chain contains a series of biomolecules that are involved in the transfer of electrons by redox reactions.

This process involves the transfer of electrons from an <u>electron donor molecule to an electron acceptor molecule</u>, resulting in the <u>release of energy.</u> Some amount of this energy is then used in <u>pumping the protons across the biological membrane.</u>

5 0
3 years ago
Kinetic theory put forward by?
RUDIKE [14]

Answer:

Daniel Bernoulli

Explanation:

He made a book with laid the basics down for kinetic theory

6 0
3 years ago
Which best describes an element?
k0ka [10]
A Material With Only One Type Of Atom
Hope This Helps
7 0
4 years ago
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