How many protons are in chromium-58?

Answers

Answer 1

Answer: 24 same as atomic mass

Related Questions

True or false: The elements in a group of the periodic table have similar characteristics
Which of the following was a major contribution to chemistry by Antoine Lavoisier
When a pot of water sits on a hot stove, the metal pot is heated, and then transfers its heat to the water. A student claims that conduction is the only type of heat transfer occurring. Which statement explains why the student's idea is incorrect?a. Conduction cannot occur between two different phases of matter. b. The water transfers heat within the pot by convection. c. Water cannot be heated by electromagnetic radiation. d. Metal is a poor conductor of heat.
Exactly 1/16 of a given amount of protactinium-234 remains after 26.76 hours. What is the half life of protactinium-234?
Which of the following is the best example of heat being. Transferred by conduction

Ionization refers to the process ofa. changing from one period to another.
c. turning lithium into fluorine.
b. losing or gaining protons.
d. losing or gaining electrons.

Answers

The ionizationor ionization energy is the process wherein the energy necessary to remove anelectron from the neutral atom. When located in the periodic table, itincreases across the row and decreases going down. The ionization energy isgreatest for the noble gases. For example, the ionization energy for fluorineis 1681.6 kJ/mol. It means that it takes1681.6 kJ/mol of fluorine to completely remove an electron or ionize it. The answeris d. losing or gaining electrons.

it refers to the process of losing and gaining of electrons

The first table was arranged by atomic mass, but later Mosely improved it by arranging by _______________.

Answers

Order of increasing atomic mass!

hope this helps :)

The first table, created by Mendeleev, was arranged by increasing atomic mass. However, it was later changed by Mosley, who arranged it the way it is today. He organized it by atomic number.

Which of the following indicates a Web site's country of origin is Canada? A. .uk
B. .ka
C. .us
D. .ca

Which of the following best describes spam?
A. A program that's not compatible with your browser
B. A program that will give your computer extra power
C. Electronic junk mail
D. Computer viruses

Answers

Choice D for problem one, choice C for the second one.No need for an explanation here, I'm sure you can explain it to yourself, hope I helped!

d # 1 c#2 answers :d

What is the relationship between concentration and rate of reaction

Answers

Reaction rate is affected by concentration. When the concentration of the reactants are raised, the rate of reaction is increased as well. Increase in concentration promotes more effective collisions. The exact relation of reaction rates on concentration is dependent on the mechanism of the reaction.

The relationship between concentration and rate of reaction is directly proportional. As the concentration of reactants increases, the rate of the reaction also increases.

What is the relationship between concentration and rate of reaction?

The rate of a chemical reaction is determined by the collision of reactant particles. When the concentration of reactants is higher, there are more particles per unit volume, increasing the likelihood of successful collisions. More collisions lead to more effective collisions, where the particles have sufficient energy and proper orientation to form products.

As a result, the reaction proceeds at a faster pace. This direct relationship between concentration and rate of reaction is described by the rate law of the specific reaction. The greater the concentration of the reactants, the more rapid the reaction will occur.

Concentration and rate of reaction are directly proportional; an increase in concentration leads to a corresponding increase in the reaction rate.

Read more about concentration here: brainly.com/question/17206790

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A sample contains 10.5 g of the radioisotope Pb-212 and 157.5 g of its daughter isotope, Bi-212. How many half-lives have passed since the sample originally formed?4
14
15
147.5

Answers

Answer: The sample must have passed 4 half-lives after the sample was originally formed.

Explanation: This is a type of radioactive decay and all the radioactive process follow first order kinetics.

Equation for the reaction of decay of $_(82)^(212)\textrm{Pb}$ radioisotope follows:

$_(82)^(212)\textrm{Pb}\rightarrow _(83)^(212)\textrm{Bi}+_(-1)^0\beta$

To calculate the initial amount of $_(82)^(212)\textrm{Pb}$ , we will require the stoichiometry of the reaction and the moles of the reactant and product.

Expression for calculating the moles is given by:

$\text{no of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Moles of $_(82)^(212)\textrm{Pb}$ left = $(10.5g)/(212g/mol)=0.0495moles$

Moles of $_(83)^(212)\textrm{Bi}=(157.5g)/(212g/mol)=0.7429moles$

By the stoichiometry of above reaction,

1 mole of $_(83)^(212)\textrm{Bi}$ is produced by 1 mole $_(82)^(212)\textrm{Pb}$

So, 0.7429 moles of $_(83)^(212)\textrm{Bi}$ will be produced by = $(1)/(1)* 0.7429=0.7429\text{ moles of }_(82)^(212)\textrm{Pb}$

Amount of $_(82)^(212)\textrm{Pb}$ decomposed will be = 0.7429 moles

Initial amount of $_(82)^(212)\textrm{Pb}$ will be = Amount decomposed + Amount left = (0.0495 + 0.7429)moles = 0.7924 moles

Now, to calculate the number of half lives, we use the formula:

$a=(a_o)/(2^n)$

where,

a = amount of reactant left after n-half lives = 0.0495 moles

$a_o$ = Initial amount of the reactant = 0.7924 moles

n = number of half lives

Putting values in above equation, we get:

$0.0495=(0.7924)/(2^n)$

$2^n=16.0080$

Taking log on both sides, we get

$n\log2=\log(16.0080)\nn=4$

Answer:

Explanation:

Edg 2020

You wash dishes for a chemistry laboratory to make extra money for laundry. You earn 12 dollars/hour, and each shift lasts 75 minutes. Your laundry requires 12 quarters/load. How many loads of laundry will each shift pay for if the cost per load rises to 16 quarters?

Answers

You calculate the amount of loads of laundry as follows:

((6 x 0.25)/ load) x 10 loads = 15.00 total cost required for laundry

(6.00 / 60 min) x (75 min/shift) = 7.50 cost / shift

15.00 / (7.50 / shift) = 2 loads of laundry

Hope this answers the question.

Each shift worked can pay for 3.75 loads of laundry if each load costs 16 quarters.

Further Explanation

This problem can be solved using simple dimensional analysis. The steps are:

Sort the given. Identify the conversion factors or equalities that may be used. Identify what is required.
Set up the dimensional analysis ensuring that units cancel out until only the desired unit is left. The equalities in the problem may be used as conversion factors.

STEP 1: Sort first the given in the problem to identify possible conversion factors to be used in the dimensional analysis.

The following equalities are given in the problem:

1 shift = 75 minutes
12 dollars = 1 hour
1 load = 16 quarters
1 dollar = 4 quarters

STEP 2: From these equalities, the following dimensional analysis can be set up:

$no. \ of \ load \ = 1 \ shift * (75 \ min)/(1 \ shift) * {(1 \ hr)/(60 \ min) * (12 \ dollars)/(1 \ hr) * { (4 \ quarters)/(1 \ dollar) * (1 \ load)/(16 \ quarters)$

$no. \ of \ load \ = 3.75 \ load$

Therefore, one shift can pay for 3.75 loads of laundry.

LEARN MORE

Learn more about Unit Conversion brainly.com/question/1594497
Learn more about Dimensional Analysis brainly.com/question/8013893

Keywords: dimensional analysis, problem solving

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Use the periodic table to calculate the molar mass of each of the following compounds. Each answer must have 2 decimal places. Ammonia (NH3): g/mol Magnesium hydroxide (Mg(OH)2): g/mol Iron(III) oxide (Fe2O3): g/mol.