All categories

2 years ago

Which quantity can vary among atoms of the same element?

1 answer:

7 0

There is this thing called isotopes
it means that atoms of the same element can have a different number of neutrons.
if there is a change in the no. of neutrons, there will definitely be a change in the mass number.

so the answer is A) mass number

You might be interested in

Bismuth(III) sulfate is an ionic compound formed from Bi3+ and SO42-. What is the correct way to represent the formula?

Hitman42 [59]

Answer:

Bi2(SO4)3

Explanation:

Bismuth(iii) sulfate is an ionic compound therefore, their is transfer of electron. Ionic compound has both cations and anions. The cations is positively charged ion while the anions is negatively charged ions. The cations loses electron to become positively charged while the anions gains electron to become negatively charged.

From the compound above, Bismuth(iii) sulfate the cations will be Bismuth ion which loses 3 electrons. The anions is the sulfate ion (S04)2- with a -2 charge.

The chemical formula can be computed from the charge configuration as follows

Bi3+ and (SO4)2-

cross multiply the charges living the sign behind to get the chemical formula

Bi2(SO4)3

Note the final chemical formula, the numbers are sub scripted

4 0

2 years ago

Which equation represents a reduction half-reaction?

horsena [70]

Answer:

Fe3+ + 3e– --------> Fe

Explanation:

Reduction refers to a gain of electrons. A specie is said to be reduced when it gains electrons or when it experiences a decrease in oxidation number. The both sentences above can be clearly seen when inspecting a reduction half equation.

Consider the redox reaction half equation;

Fe3+ + 3e– ------>Fe

We can see that Fe^3+ accepted three electrons, the oxidation number of iron thereby decreased from +3 to zero from left to right. This implies that the Fe^3+ was actually reduced according to the equation shown.

7 0

2 years ago

Your blood contains many dissolved solids. What do you think could be done if you needed to remove the water from a sample of bl

bezimeni [28]

An apparatus called a centrifuge is used to separate solids from the aqueous portion of blood. A sample of the blood is transferred to a small vial or test tube and this vessel is then placed into the centrifuge. The machine works by rotating the sample around a fixed axis, spinning it in a circle, and this results in a strong force being applied to the sample that is perpendicular to the axis of the spin. This force is called the centripetal force and this centripetal acceleration causes the most dense particles in the blood to move outward in the radial direction. This results in the less dense materials being displaced by the more dense materials. Once the sample vessel is retrieved from the centrifuge, the sample will be separated into layers, such that the solids are found at the bottom of the vessel. The less dense materials such as the water will be found at the top of the vessel.

8 0

2 years ago

Products or solutions found at home or in store and their characteristics

AleksAgata [21]

Answer:

bruh, just go in your bathroom and look for cleaning products

Explanation:

4 0

2 years ago

How many grams of the titrant used in the question 3 (sodium hydroxide -- 0.1001 mole/kg of solution) are required to titrate 10

katen-ka-za [31]

846.6 g of sodium hydroxide solution

Explanation:

The chemical reaction of butanedioic acid with sodium hydroxide:

HOOC-CH₂-CH₂-COOH + 2 NaOH → NaOOC-CH₂-CH₂-COONa + 2 H₂O

To find the mass of the solute (butanedioic acid) from a solution about which we know that the weight/weight percent concentration, we use the following formula:

concentration / 100 = solute mass / solution mass

solute mass = (concentration × solution mass) / 100

solute mass (butanedioic acid mass) = (5 × 10) / 100 = 0.5 g

number of moles = mass / molar weight

number of moles of butanedioic acid = 0.5 / 118 = 0.04237 moles

Knowing the chemical reaction we devise the following reasoning:

if 1 mole of butanoic acid reacts with 2 moles of sodium hydroxide

then 0.04237 moles of butanoic acid reacts with X moles of sodium hydroxide

X = (0.04237 × 2) / 1 = 0.08474 moles of sodium hydroxide

If the concentration of the titrant, sodium hydroxide solution, is 0.1001 moles / 1000 g of solution the we devise the following reasoning:

if there are 0.1001 moles of sodium hydroxide in 1000 g of solution

then there are 0.08474 moles of sodium hydroxide in Y g of solution

Y = (0.08474 × 1000) / 0.1001 = 846.6 g of solution

Learn more about:

weight/weight percent concentration

brainly.com/question/3830901

#learnwithBrainly

5 0

2 years ago