All categories

3 years ago

ANSWER ASAP PLZ???????????????????????????????????

Chemistry

2 answers:

Furkat [3]3 years ago

7 0

Answer:

The answer should be A

Explanation:

sattari [20]3 years ago

7 0

Answer:

Leaving a Copper penny in vinegar until it turns green

Explanation:

the others are physical changes. when copper penny is put in vinegar, a reactive oixde layer is formed which is green in colour. namely, Cu(II) acetate.

The green growing on the penny of copper and the rust forming on the nail of iron are chemical changes. Boiling away salt water, scraping iron filings from a mixture of sand with a magnet, and breaking a rock with a hammer, are physical changes.

You might be interested in

Aqueous hydrobromic acid will react with solid sodium hydroxide to produce aqueous sodium bromide and liquid water . Suppose 17.

Marysya12 [62]

Answer: The mass of NaBr that can be produced is 6.3 grams

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

For HBr:

Given mass of HBr = 17 g

Molar mass of HBr = 81 g/mol

Putting values in equation 1, we get:

$\text{Moles of HBr}=\frac{17g}{81g/mol}=0.210mol$

For NaOH:

Given mass of NaOH = 2.44 g

Molar mass of NaOH = 40 g/mol

Putting values in equation 1, we get:

$\text{Moles of NaOH}=\frac{2.44g}{40g/mol}=0.061mol$

The chemical equation for the reaction of HBr and NaOH follows:

$HBr+NaOH\rightarrow NaBr+H_2O$

By Stoichiometry of the reaction:

1 mole of NaOH reacts with 1 mole of HBr

So, 0.061 moles of NaOH will react with = $\frac{1}{1}\times 0.061=0.061mol$ of HBr

As, given amount of HBr is more than the required amount. So, it is considered as an excess reagent.

Thus, NaOH is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

1 mole of NaOH produces 1 mole of NaBr

So, 0.061 moles of NaOH will produce = $\frac{1}{1}\times 0.061=0.061moles$ of carbon dioxide

Now, calculating the mass of NaBr from equation 1, we get:

Molar mass of NaBr = 103 g/mol

Moles of NaBr = 0.061 moles

Putting values in equation 1, we get:

$0.061mol=\frac{\text{Mass of NaBr}}{103g/mol}\\\\\text{Mass of NaBr}=(0.061mol\times 103g/mol)=6.28g$

Hence, the mass of NaBr that can be produced is 6.3 grams

4 0

3 years ago

The process in which organisms grow and replace worn-out cells is called: A. Cell regeneration B. Cell division C. Mitosis D. Bo

djyliett [7]

The mitosis is the cell division so it both B and C

7 0

4 years ago

What is the best place to find detailed information about a hazardous chemical used in your work area

azamat

Answer:

MSDS -- Material Safety Data sheet

Explanation:

The full form of MSDS is Material Safety Data sheet. A Material Safety Data Sheet is a document which contains the information related to the potential hazards (fire or reactivity and environmental and health ) and includes how to work or use the chemical product safely.

It is regarded as an essential starting point for development of the complete health as well as safety program. MSDS also contains other information such as the use of the chemical, its storage and also handling and the emergency procedures that are related to the hazards of the material.

3 0

3 years ago

George’s cat had a litter of seven kittens. Four of the kittens are male. Three are female. Which set of symbols correctly descr

swat32

B. XY Represents name male. While. XX represents female. Hope that helps

5 0

3 years ago

Ag has an anomalous electron configuration. write the observed electron configuration of ag. express your answer in complete for

LUCKY_DIMON [66]

In Silver, the 4d orbitals will be completely filled. That implies that it does not have two electrons in the 5s orbital. The electronic configuration of Silver is :

Ag (47) = 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^1 4d^10

8 0

4 years ago