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3 years ago

What are some chemistry questions

Chemistry

1 answer:

Sloan [31]3 years ago

3 0

Answer:

1. What is a substance that CANNOT be chemically broken down into simpler substances?

2. What type of change is one that produces new substances like burning wood to make ashes or mixing mentos and coke. You can't get the wood or the mentos back.

3. What is a change from a solid directly to a gas

4. What is a change from a gas to a liquid

5. What are nonmetals in group 7A of the periodic table?

1. An element

2. Chemical change

3. sublimation

4. condensations

5. Halogens

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Anton [14]

Answer:

Weight is the measure of the force of gravity on an object. The mass of an object will never change, but the weight of an item can change based on its location. For example, you may weigh 100 pounds on Earth, but in outer space you would be weightless.

Explanation:

I can't see the options but I hope this helps!

8 0

3 years ago

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A hypothetical metal crystallizes with the face-centered cubic unit cell. The radius of the metal atom is 234 picometers and its

AleksAgata [21]

Answer:

$\delta=101.13 g/cm^3$

Explanation:

As can be seen in the Figure in a face-centered cubic unit cell you have:

Six halves of atoms
Eight 1/8 of atom (1 in each corner)

In total:

$n_{atom}=6*0.5+8*\frac{1}{8}=4 atoms$

Now, each side of the cell is 234 picometers (2.34e-8 cm) long

$V_{cell}=L^3=(2.34e^{-8} cm)^3$

$V_{cell}=1.28*10^{-23}cm^3$

Atoms per cm3:

$n=\frac{4 atoms}{1.28*10^{-23}cm^3}$

$n=3.12*10^{23} atoms/cm^3$

Expressing in mass:

$\delta=3.12*10^{23} atoms/cm^3* \frac{1 mol}{6.022*10^{23}}*195.08 g/mol$

$\delta=101.13 g/cm^3$

6 0

4 years ago

Which is the correctly balanced chemical equation for the reaction of KOH and H2SO4?

Aleks04 [339]

<span>i think the answer should be 2KOH +H2SO4=K2SO4+2H20</span>

4 0

3 years ago

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The process of chlorination in water treatment aims at ?

Andrews [41]

Answer:

Chlorowanie wody jest procesem względnie tanim – koszt zbudowania samej instalacji do dezynfekcji, jak również koszt operacyjny wytworzenia 1 metra sześciennego uzdatnionej chlorem wody jest niższy od dezynfekcji wody za pomocą ozonu. Źródłem chloru w procesie dezynfekcji jest zazwyczaj podchloryn sodu, rzadziej dwutlenek chloru.

Explanation:

8 0

2 years ago

In a molecule of water, how many electrons are shared between each hydrogen atom and an oxygen atom? A. One B. Two C. Four

lesya692 [45]

The answer is Two (B).

6 0

3 years ago

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