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dedylja [7]
3 years ago
10

Students in a science class were studying the physical properties of various elements and compounds. One lab group observed that

the element they were given was shiny, brittle, and when placed in the gap shown by A and B of an open circuit caused the light bulb to glow dimly. Based on the students’ observations, what is the correct classification of this element?
Chemistry
1 answer:
katrin2010 [14]3 years ago
7 0

Answer:

A:metal

Explanation:

because if a light bulb was placed on metal with force it would light

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Complete the following equations : H3PO4 = 3H+ --------------- CaSO4 = Ca 2+ ---------------- (2) b) Write the formulae of the s
jeka94

Answer:

H₃PO₄ → 3H⁺ + PO₄³⁻

CaSO₄ → Ca²⁺ + SO₄²⁻

b. CaCl₂

Explanation:

When H₃PO₄ is dissolved in water, there are produced the H⁺ and PO₄³⁻ ions. The equation is:

H₃PO₄ → 3H⁺ + PO₄³⁻

In the same way, CaSO₄ is dissolved in:

CaSO₄ → Ca²⁺ + SO₄²⁻

b. Now, in a reaction of an acid (HCl) and a base (Ca(OH)₂), water, H₂O and a salt are produced:

2 HCl + Ca(OH)₂ → 2H₂O + Salt

The ions that are not present in the reaction are Cl⁻ and Ca²⁺, the salt is CaCl₂ and the balanced reaction is:

2 HCl + Ca(OH)₂ → 2H₂O + CaCl₂

5 0
3 years ago
Melted candle wax has no fixed shape, but it does have a fixed volume. So, melted candle wax is a
dlinn [17]
It is a liquid because when you have a liquid, there is no definite shape. Therefore, this would be the answer because it takes the shape of its container. 

Final answer: a. Liquid 
7 0
3 years ago
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What are three forms of energy that transform into a hot air balloon? ___ to ___ to ___
34kurt

Answer:

Conduction, Convection, and Radiation

Explanation:

Kinetic energy is the energy a body possesses by being in motion. Kinetic energy takes place when the air inside the balloon gets exposed to heat. The hot air rises which will create and fill the shape of the balloon and allows it to move. Heat energy, also known as thermal energy occurs.

4 0
3 years ago
Calculate each of the following quantities:<br> (g) Number of atoms in 0.0015 mol of fluorine gas
Inessa05 [86]

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<h3>What is fluorine?</h3>

The chemical element fluorine has an atomic number of 9 and the symbol F. The lightest halogen, it is an extremely poisonous, pale yellow diatomic gas under normal conditions. With the exception of argon, neon, and helium, it reacts with every other element, making it the most electronegative and reactive element.

Fluorine is the 24th most abundant element overall and the 13th most abundant on Earth. When added to metal ores to decrease their melting temperatures for smelting, fluorite, the main mineral source of fluorine that gave the element its name, was first recorded in 1529. The Latin word fluo, which means "flow," gave the mineral its name.

Learn more about fluorine

brainly.com/question/24373411

#SPJ4

8 0
2 years ago
I was wondering if this is correct?
Digiron [165]

Answer:

I believe you are correct

thats because All of the 2nd choices seem to be larger

5 0
3 years ago
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