HELP LAST ATTEMPT !?!!

HELP LAST ATTEMPT !?!!

Answers

Answer 1

Answer:

111Cd 12.80% stable

Explanation:

Maybe?


Related Questions

Caltrain tablets contains calcium carbonate. If one tablet requires 34.46 mL of 0.291 M solution of hydrochloric acid for neutralization, how many milligrams of calcium carbonate is in this caltrate tablet?

Answers

There are 500 mg of calcium carbonate is in this caltrate tablet

The equation of the reaction is;

2HCl(aq) + CaCO3(aq) ------> CaCl2(aq) + CO2(g) + H2O(l)

Next, we have to obtain the amount HCl reacted as follows;

Number of moles = concentration × volume

Volume = 34.46 mL or 0.03446 L

Concentration =  0.291 M

Number of moles = 0.291 M ×  0.03446 L

Number of moles = 0.01 moles

Since the reaction of HCl and CaCO3 are in the ratio of 2:1

2 moles of HCl reacts with 1 mole of CaCO3

0.01 moles of HCl reacts with  0.01 moles ×  1 mole/2 moles

= 0.005 moles of CaCO3

Mass of CaCO3 = number of moles  × molar mass

Mass of CaCO3 =  0.005 moles of CaCO3 × 100 g/mol

Mass of CaCO3 =  0.5 g or 500 mg

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Which element in row 6 of the periodic table has the largest radius

Answers

Answer:

Cesium atomic number 55

How many significant figures are in the following number? 3,000.0 x 10⁴ grams

Answers

Answer:

5 significant figures.

Explanation:

The decimal place makes the zeros significant.

Molybdenum can form a wide series of halide compounds, including four different fluoride compounds. The percent by mass of molybdenum in the four compounds is 63.0%,
56.0%,
50.0%,
and 46.0%.
Determine the formula and name for each of the four different molybdenum fluorides.

Answers

The formula and names of the compounds are:

1. Formula of compound => MoF₃

Name of compound => Molybdenum trifluoride

2. Formula of compound => MoF₄

Name of compound => Molybdenum tetrafluoride

3. Formula of compound => MoF₅

Name of compound => Molybdenum pentafluoride  

4. Formula of compound => MoF₆

Name of compound => Molybdenum hexafluoride  

1. Determination of the name and formula of the molybdenum fluoride having 63.0% of molybdenum.

Molybdenum (Mo) = 63.0%

Fluorine (F) = 100 – 63 = 37%

Formula =?

Mo = 63.0%

F = 37%

Divide by their molar mass

Mo = 63.0 / 96 = 0.656

F = 37 / 19 = 1.947

Divide by the smallest

Mo = 0.656 / 0.656 = 1

F = 1.947 / 0.656 = 3

Therefore,

Formula of compound => MoF₃

Name of compound => Molybdenum trifluoride

2. Determination of the name and formula of the molybdenum fluoride having 56.0% of molybdenum.

Molybdenum (Mo) = 56.0%,

Fluorine (F) = 100 – 56 = 44%

Formula =?

Mo = 56%

F = 44%

Divide by their molar mass

Mo = 56 / 96 = 0.583

F = 44 / 19 = 2.316

Divide by the smallest

Mo = 0.583 / 0.583 = 1

F = 2.316 / 0.583 = 4

Therefore,

Formula of compound => MoF₄

Name of compound => Molybdenum tetrafluoride

3. Determination of the name and formula of the molybdenum fluoride having 50.0% of molybdenum.

Molybdenum (Mo) = 50.0%,

Fluorine (F) = 100 – 50 = 50%

Formula =?

Mo = 50%

F = 50%

Divide by their molar mass

Mo = 50 / 96 = 0.520

F = 50 / 19 = 2.632

Divide by the smallest

Mo = 0.520 / 0.520 = 1

F = 2.632 / 0.520 = 5

Therefore,

Formula of compound => MoF₅

Name of compound => Molybdenum pentafluoride  

4. Determination of the name and formula of the molybdenum fluoride having 46.0% of molybdenum.

Molybdenum (Mo) = 46.0%,

Fluorine (F) = 100 – 46 = 54%

Formula =?

Mo = 46%

F = 54%

Divide by their molar mass

Mo = 46 / 96 = 0.479

F = 54 / 19 = 2.842

Divide by the smallest

Mo = 0.479 / 0.479 = 1

F = 2.842 / 0.479 = 6

Therefore,

Formula of compound => MoF₆

Name of compound => Molybdenum hexafluoride  

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Which of the following is NOT a correct ordering of subshells in the periodic table?
O 2p < 35
O 3d < 4p
O 3d < 45
04s < 4p

Answers

3d < 4s  is NOT a correct ordering of subshells in the periodic table because 4s is at a lower energy level than 3d.

According to the Aufbau principle,   The electron configuration of an element tells how electrons of that element are arranged in thier subshells from their lowest energy state before the highest energy state.

For example, before a 2s subshell can be occupied, A 1s subshell must be filled.

The orbitals are filled in this order:

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s,

For example, Na (sodium) with 11 atomic number is written as 1s2 2s2 2p6 3s1

Therefore,

2p < 3s   True

3d < 4p   True

3d < 4s     False

4s < 4p   True

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A student wants to know why sandhill crane‘s fly south for the winter. The student uses a map of North America to make a model of the paths sandhill cranes take as they migrate. The student draws lines with arrows to show the routes sandhill cranes are known to take. Which two issues describe limitations of the students models?

Answers

Two limitations of the student's models are that the models do not explain why the phenomenon occurs and the models only record the phenomenon in a limited way

Understanding a specific phenomenon requires gathering and analyzing data thoroughly because the researcher needs to collect data that is directly related to the phenomenon and this data needs to be complete and accurate to have reliable conclusions.

In this situation, the student created some models of the routes of the sandhill crane's migration. This data has two main limitations:

It does not answer the question "why?": If the student wants to understand why these birds go to the South, the models are not very useful because they show "how" these birds migrate but not the reason for this migration.It records the migration only in a limited way: For the models to be complete the student needs to record the migration pattern for two years or more, as the pattern might change

Based on this, two limitations of the models are that they do not explain the phenomenon and the data is not complete.

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Zn + O2= ZnO

How many moles of zinc are needed to make 500. g of zinc oxide?​

Answers

Answer:

5.15 moles

Explanation:

2zn + o2 = 2zno

5.15 2.57 5.15 moles

nzno=500/(16x2+65)= 5.15 moles

-> nzn = 5.15 x 2 ÷ 2 = 5.15 moles

What is the law of conservation of energy and how do we know this is true?

Answers

Answer:The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another. This means that a system always has the same amount of energy, unless it's added from the outside. ... The only way to use energy is to transform energy from one form to another.

Answer:

law of conservation of energy is energy cannot be created or destroyed but can be transformed from one form to another

it is true as potential energy can be converted into kinetic energy

PLS GUYS HELP!!!! Examine the table with the distances and times recorded for five different trains. Calculate the average speed for each train and select the correct answer choices. Select ALL that apply.

Answers

Answer:

A: Train I had the fastest average speed

C: Trains II and V had the same average speed

E: Trains III and IV had the same average speed

Explanation:

The element radium has a mass number of 226 and an atomic number of 88. How many neutrons does an atom of radium have?

A. 226.
B. 88.
C. 138.
D. 314.

Answers

Answer:

if you subtract 88 from 226 you get 138

so uour answer would be C.

Answer:

138

the conversion of an atom of one element into a different element through nuclear changes

A nuclear equation is balanced according to mass number. A chemical equation is balanced according to the total mass before and after the change

82

Some of the matter is converted to energy

Explanation:

I've used this website enough I think its time for me to give back.

2.
Which form of cell division produces four cells with chromosomes different from the
parent cell?
B
budding
dominant
meiosis
Dmitosis

Answers

Answer:

meiosis

Explanation:

The RDI for sodium for adults is 2300mg. What amount of table salt (in grams) contains this quantity of sodium? Express answer to two significant figures and include the appropriate units.

Answers

The rid. 384099 in the magic

The amount of table salt (in grams) contains this quantity of sodium is 5.844 g.

What is table salt?

Table salt is made up of sodium and chloride. The chemical formula of table salt is NaCl. This is a common salt used daily in the kitchen. This gives us a taste of food. And it is also necessary for the body.

The RDI for sodium for adults is given that is 2300 mg. The quantity of sodium is given = 2300 mg = 2.30 g (since the answer is asked in grams)

As we know, table salt is NaCl.

The molar mass of table salt (NaCl) is 58.44 g/mol

The molar mass of sodium (Na) is 23.00 g/mol

So, for 23.00 g sodium, we need 58.44 g NaCl.

And, for 2.30 g sodium we require (58.44 g x 2.3 g) / 23 g = 5.844 g = 6 g (to one significant figure).

Therefore, the amount of sodium is present in 5.844 grams of table salt.

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r.
3. How are elements on the periodic table
arranged? sc.8.P.8.6
A atomic mass
B atomic number
© chemical symbol
D state of matter
no

Answers

Answer: B. Atomic number

Using one or more of your senses to gather information is called
observing
c predicting
b inferring
d classifiying

Answers

Answer:

using one or more of your senses is Observing

how do you use an enchantment table in mine-craft. Please actually answer.

Answers

Answer:

You place an enchantment ta ke then you place a weapon or armor and press enchant. I hope this helps

Explanation:

Answer:

Depends on what you need to enchant

Explanation:

You can enchant any tools or armor if you put lapis in the box with a symbol and you have enough exp which will show up next to the enchantment you can enchant those and you can also enchant any normal books that way

Fermium-253 has a half-life of 0.334 seconds. How long will it take, in seconds, for a 96 atom sample to decay to 3 atoms?​

Answers

The half life time period of decaying 96 atom sample to 3 atoms of Fermium-253 if it has a half-life of 0.334 seconds is 1.67 s.

What is half life time period?

Half life time period is defined as the time interval which is required to decay the substance into half of its concentration. It is denoted by t(1/2).

As, atom decay in first half life time = 48 atoms.

Atom decay in second half life time = 24 atoms.

Atom decay in third half life time = 12 atoms.

Atom decay in fourth half life time = 6 atoms.

Atom decay in fifth half life time = 3 atoms.

So, we can see that in 5 half life time 96 atoms decay into 3 atoms.

So, time interval require to decay 96 atoms into 3 atoms is 5 × 0.334 = 1.67 s.

Thus, we concluded that the half life time period of decaying 96 atom sample to 3 atoms of Fermium-253 if it has a half-life of 0.334 seconds is 1.67 s.

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please answer this correctly​

Answers

Answer:

5: tomato and vinegar

6: air

draw a conclusion a weather balloon carries sensing instruments very high altitudes to detect weather information. a weather balloon is filled near earth's surface with a low density gas. describe what happens to the particles the pressure, and the volume inside the balloon as it rises.

Answers

Answer:

im sorry the answer if i did i would

Explanation:

How would a descriptive model of Earth's layers be categorized?
a. abstract model
b. prototype model
c. concrete model
d. conceptual model

Answers

The Earth can be divided into one of two ways – mechanically or chemically. Mechanically – or rheological, meaning the study of liquid states – it can be divided into the lithosphere, asthenosphere, mesospheric mantle, outer core, and the inner core.

Explanation:

is mercury homogeneous or heterogeneous?

Answers

Answer:

homogenous

Explanation:

its a pure element, so it is a pure substance

homogeneous
hope this helps!

A large office building is 1.07 102 m long, 31 m wide, and 4.25 x 102 m high. What is its volume?

Answers

Answer:

1409725 m^3

Explanation:

volume = length * width * height

volume = (1.07e2) * (31) * (4.25e2)

volume = 1409725 m^3

Each atom consists of a central nucleus and several shells that contain electrons. The outermost electrons are called valence electrons. Most atoms are stable with a configuration of eight valence electrons. This is known as the octet rule. How many valence electrons does each atom have?

Answers

If you are talking about an atom with a full octet, then it would just have a full shell of 8 valence electrons.

Answer:

valence

Explanation:

✞how are snythetic detergents better than soap??⭐⭐㋛​

Answers

Soaps work in soft water. However, they are not effective in hard water. In contrast, synthetic detergents work both in soft water and hard water. Therefore, synthetic detergents are better than soaps.

Answer:

Advantages of synthetic detergents over soaps: Detergents can work with hard water too while soaps cannot. Synthetic detergents are stronger cleansing agents than soaps.

Explanation:

sorry if I'm wrong

Which of these is a function of all cells ?

A. To produce oxygen through photosynthesis
B. To combine with other cells to form tissues
C. To subdivide to form cells for sexual reproduction
D. To transfer genetic information from one generation to the next

Answers

Answer:

a because it help in protecting disease

How are energy and work related?
O A. Work and energy are the same.
B. Work times energy is force.
C. Energy is the force needed to do work.
D. Energy is the capacity to do work.
SUBMI

Answers

Answer:

c

Explanation:

because u need the energy to be able to work

COMO CREES QUE SE PODRIA SOLUCIONAR LA POBREZA ) SI NO SABEN NO CONTESTEN :( EL QUE ME AYUDE LE DOY CORONA POR FA VOR

Answers

Answer:

AUMENTA EL SALARIO MÍNIMO Y CREA MÁS EMPLEOS

Explanation:

Please help! How do you calculate the "average percent yield"? I just need the formula.

I already know how to find the theoretical yield and percent yield, I just don't know how to find the average or what it means by average.

Answers

Answer:

First make sure the both weights have the same units.

Take your experimental yield and divide it by the theoretical yield.

Multiply this value by 100 to find the percent yield.

Explanation:

For the Average. Add up the two percent yields that you found and divide by 2.

How can you identify the gas produced in a chemical reaction without observing the atoms and molecules directly?

Answers

To identify the gas produced in a chemical reaction without observing the atoms and molecules directly through the characteristics of the gas.

Chemical reaction is defined as the process by which substances (known as reactants) combine together with the formation of bonds to form products.

There are some signs that shows that chemical reaction has occurred. They include:

Color Change Change of temperatureGiving off gas (Evolution of gas)

Therefore, the production of gas from a chemical reaction shows that a reaction has occurred.

These gases can be identified without observing the molecules through that characteristics of the gas. This include:

the smell of the gas: For example when a gas is given off, and it smells like urine, it's likely to be ammonia gas. color change that occurs during the chemical reaction can show the type of gas that was given off. For example when lime water turns into milky color, it shows the presence of carbondioxide gas.

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The table shows the densities of Earth's layers.


Which of these is most likely the density of Earth's mantle?

1.5-2.2 g/cm3

3.4-5.6 g/cm3

10.6-12.4 g/cm3

13.5-15.2 g/cm3

Answers

Answer:3.4 - 5.6

Explanation:

Write a balanced chemical equation for the standard formation reaction of gaseous nitrogen monoxide (NO). Please help me

Answers

Answer:

N2 + O2 ------------->2NO(Balanced Reaction)

A balanced chemical equation for the standard formation reaction of gaseous nitrogen monoxide (NO) -

1/2 [tex]N_{2}[/tex] (g)   + 1/2 [tex]O_2[/tex] (g)   -----------------> NO (g)

Synthesis or formation reactions involve the combination of two or more substances that will react. There is only one product of a synthesis reaction.

Chemical reactions involve the rearrangement of electrons between elements resulting in the formation of a new substance.in a standard formation reaction, one mole of a substance is produced from its elements in their standard states.Standard formation reaction at 25 degrees C and 1 atm pressure.

1/2 [tex]N_{2}[/tex] (g)   + 1/2 [tex]O_2[/tex] (g)   -----------------> NO (g)

Thus, A balanced chemical equation for the standard formation reaction of gaseous nitrogen monoxide (NO) -

1/2 [tex]N_{2}[/tex] (g)   + 1/2 [tex]O_2[/tex] (g)   -----------------> NO (g)

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