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frez [133]
3 years ago
5

2. Oxygen can combine with carbon to form two compounds, carbon monoxide, and carbon dioxide. The ratio of the masses of oxygen

that combine with a given mass of carbon is 1:2. This is an example of
A.Law of Mass conservation
B.Law of Definite Proportion.
C.Law of Multiple proportions
D.None of the above

3. The smallest unit of an element that can exist either alone or in combination with other such particles of the same or different elements is the
.A.Proton
C. Electron
B.Neutron
D. Atom

7. An atom is electrically neutral because
A.thenumberof protons and neutrons are equal.
B.the number of protons and electrons is equal.
C.neutrons balance the protons and electrons.
D. It has the same number of protons, neutrons, and electrons.

8. What happens when an ion is formed?
A. The number of protons is changed.
B. The number of neutrons is changed.
C. The number of electrons is changed.
D. The number of proton, neutron, and electron is changed

Bohr’s contribution to the development of atomic structures
A.referred to as the “plum pudding model.”
B.the discovery that electrons surround a dense nucleus.
C.proposed that electrons travel in circular orbits around the nucleus.
D.None of the above.
Chemistry
1 answer:
soldier1979 [14.2K]3 years ago
8 0
Neutron
Ghggffghhgfthvffybbjjggbj
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Contact [7]

Answer:

A

Explanation:

8 0
3 years ago
You have 35 ml of water and u drop a rock in so now it is 40ml of water what is the volume of the rock
Soloha48 [4]
Okay
40ml-35ml=5ml
5ml is the volume of the rock
1ml=1cm3
hence the volume of the rock is 5cm3
3 0
3 years ago
1. Balance this reaction: Fe2O3(s) + C(s) → Fe(s) + CO2(g)
MA_775_DIABLO [31]
<span>2Fe2O3(s) + 3C(s) →4 Fe(s) + 3CO2(g)
                       3 mol                      3mol
                       4 mol                      x mol
x=4*3/3= 4.0 mol

</span>2Fe2O3(s) + 3C(s) →4 Fe(s) + 3CO2(g)<span>
2 mol              3 mol
14 mol            x mol

x=14*3/2= 21.0 mol</span>
4 0
3 years ago
How many grams of KBr are required to make 350. mL of a 0.115 M KBr solution?
Vsevolod [243]
0.115 M means that 0.115 moles of KBr are contained in a volume of 1000 ml, therefore a volume of 350 ml will have (0.115 × 0.35) = 04025 moles
From the formula of molarity moles = molarity × volume in liters
1 mole of KBr is equivalent to 119 g
Therefore, the mass = 0.04025 ×  119  g = 4.79 g
6 0
3 years ago
Read 2 more answers
A poundal is the force required to accelerate a mass of 1 lbm at a rate of 1 ft/s2, and a slug is the mass of an object that wil
Darya [45]
Remember the formula as per the second Law of Newton: F = m*a

And also remember that the weight is the force with which the mass is attracted by the planet (or satellite in the case of the moon).

With that information you can answer the questions:

a) Weight = F = m*a

m = 175 slugs = 175 lbm

i) Earth

a = 32.17 ft/s^2

Weight on Earth = 175 lbm * 32.17 ft / s^2 = 5,629.75 poundal

ii) Moon

a = [1/6] 32.17 ft/s^2

Weight on the Moon = [1/6]*5,629.75 poundal = 938.29 poundal

b) Force = 355 poundal
m = 25.0 slug

a in m/s^2 = ?

First calculate the force in ft/s^2

F = m*a => a = F/m = 355 poundal / 25.0 slug = 14.2 ft/s^2

Conversion:

14.2 ft / s^2 * [ 0.3048 m/ft] = 4.32816 m/s^2

Answer: 4.33 m/s^2


8 0
3 years ago
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