Please help I will mark brainly

Answers

Answer 1

Answer:

Look, this shouldn't be that hard. As long as you know the symbol for each element, you just put a subscript to indicate how many there are in each compound.

For the second row, there is one C and 4 H's. That's $CH_4$ , or methane.

For the third row, there is one Si and 2 O's. That's $SiO_2$ , or common glass/quartz.

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How does the solubility of a gas change with increasing temperature

Answers

The definition of solubility is the maximum quantity of solute that can dissolve in a certain quantity of solvent or quantity of solution at a specified temperature or pressure (in the case of gaseous solutes). For Gases, solubility decreases as temperature increases (duh...you have seen water boil, right?) The physical reason for this is that when most gases dissolve in solution, the process is exothermic. This means that heat is released as the gas dissolves. This is very similar to the reason that vapor pressure increases with temperature. Increased temperature causes an increase in kinetic energy. The higher kinetic energy causes more motion in the gas molecules which break intermolecular bonds and escape from solution. Do you need any more?

Which statement best describes what happens in a fission reaction

Answers

The answer is; Heavy nuclei split into lighter nuclei

Heavier isotopes of elements are the most unstable and decay quickly into lighter elements (mostly because they have high neutron to proton ratio). The decay involves the splitting of the heavier atom into a lighter atom and the release of neutron(s) particles and radiation energy. The released neutrons then hit another isotope and split it. This chain of reaction continues so far as the isotopes are close by. The time it takes for a radioactive element to decay into another element is called half-life.

Fill in the blanks with the words in the following list. apron
doing
MSDS
drink
eat
mix
goggles
safety shower
water
acids

Rule number one in laboratory safety is know what you are
doing
.

The best protections from chemical splashes and spills are an ________
to cover your body and _________
for your eyes.

Never
eat
food or
drink
liquids from a lab container, even if it has been thoroughly washed.
Rinse skin thoroughly with
water
after a chemical splash.

A _________
should be used for more significant spills.

Pour
acids
into water, never the other way around.
Do not
mix
chemicals unless you know what the product of the reaction will be.

A _________
describes important safety and reactivity information about a chemical.

Fill in the blanks please

Answers

aprons are used to cover your body (most people use la coats though) and goggles are used to cover your eyes.

A Safety shower should be used for more significant spills.

An MSDS (Material Safety Data Sheet) describes important safety and reactivity information about a chemical.

I hope this helps. Let me know in the comments if anything is unclear.

Describe erosion in your own words

Answers

Answer:

the action of becoming destroyed and removed via air, rain, or even other natural phenomena

Explanation:

How many grams of chloride ions are in 8.3 g of copper (II) chloride

Answers

$4.4\; {\rm g}$ .

Explanation

Refer to a modern periodic table for relative atomic mass:

Cu- 63.546;
Cl- 35.45.

Formula of copper (II) chloride: CuCl₂.

Formula mass of copper (II) chloride:

63.546 + 2 × 35.45 = $134.446\; {\rm g \cdot mol^(-1)}$ .

How many ${\rm mol}$ of formula units in 8.3 grams of CuCl₂?

$(8.3\; {\rm g}) / (134.446\; {\rm g \cdot mol^(-1)}) \approx 0.0617\; {\rm mol}$

Note the subscript "2" in the formula CuCl₂. There are $2\; {\rm mol}$ of chloride ions in every $1\; {\rm mol}$ formula unit of CuCl₂.

There would be $2 * 0.0617\; {\rm mol} \approx 0.123\; {\rm mol}$ of ${\rm Cl^(-)}$ ions in $0.0617\; {\rm mol}$ formula units of CuCl₂.

The mass of $1\; {\rm mol}$ of chloride ion is 35.45 grams.

The mass of $0.123\; {\rm mol}$ of ${\rm Cl^(-)}$ ions will be $35.45 * 0.123 \approx 4.4\; {\rm g}$ .

Round the final value to two sig. fig. since the mass in the question is also 2 sig. fig.

Which generally occurs as temperature increases?

Answers

Solubility increases.

Answer:

solubility increases

Explanation:

For example with gases dissolved in liquids, a rise in temp would decrease solubility. There are even some solid in liquid soln where increasing temps decreases solubility.

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