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3 years ago

Please help, I'm confused and it's due very soon!

Chemistry

1 answer:

ryzh [129]3 years ago

3 0

Answer:

1. Lanthanum-139 atom is the stable isotope of lanthanum with relative atomic mass 138.906348, 99.9 atom percent natural abundance and nuclear spin 7/2.

2. In fact, over 80% of electric cars sold globally utilized permanent magnet-based motors in 2019. These magnets are typically made with rare-earth materials such as neodymium and dysprosium, which have a very geographically constrained supply chain.

3. It is the second most reactive of the rare-earth metals after europium. Lanthanum oxidizes in air at room temperature to form La2O3. It slowly reacts with water and quickly dissolves in diluted acids, except hydrofluoric acid (HF) because of formation of a protective fluoride (LaF3) layer on the surface of the metal.

Explanation:

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A diver has 3,400 J of gravitational potential energy after climbing

Zanzabum

Answer:

57.8kg

Explanation:

Potential energy is given by:

$U =mgh$

Where U is potential energy, m is mass, g is acceleration due to gravity, and h is height. Using this equation:

$3400=m(9.8)(6)\\3400=58.8m\\m=57.8kg$

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3 years ago

3. Two people are playing tug of war. One person pulls to the right with 32 N of force. The other person pulls to the left with

SVETLANKA909090 [29]

The net force = -5 N

The direction : to the left(negative sign)

<h3>Further explanation </h3>

Net force : the sum of all forces acting on an object

Force is a vector quantity that has both magnitude and direction,

We agree that the move up and to the right is a positive sign, while down and to the left is a negative sign.

The direction of the force (horizontal motion) is to the right (+32 N), and to the left (-37 N), so the net force :

$\tt \sum F=F~right-F~left\\\\\sum F=32-37\\\\\sum F=-5~N$

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3 years ago

Please help asap! Giving brainliest to correct answer.

Leya [2.2K]

Answer:

C. It may act as an insulator or a conductor.

Explanation:

Group B are the metalloids, so they have properties of both metals and nonmetals.

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2 years ago

Question 14 of 32

ser-zykov [4K]

The equilibrium expression for the reaction; C(s) + O₂(g) ------->CO₂(g) is [CO2]/[C] [O2] option C.

<h3>What is the equilibrium expression?</h3>

The equilibrium expression shows how much of the reactants are converted into products. If the equilibrium constant is large and positive, most of the reactants have been converted into products.

Thus, the equilibrium expression for the reaction; C(s) + O₂(g) ------->CO₂(g) is [CO2]/[C] [O2] option C.

Learn more about equilibrium constant:brainly.com/question/10038290

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2 years ago

When 20 ml of 0.1 M HCl is mixed with 20

Bas_tet [7]

Answer:

it is b i took the test

Explanation:

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1 year ago