Marie Curie's work with radioactive materials eventually lead to her death. At the age of 66, what
disease did Madame Curie die from?

Answer:

Explanation:

Helium (He) is similar in that it, too, only has room for two electrons in its only valence shell. Hydrogen and helium have only one electron shell. The first shell has only one s orbital and no p orbital, so it holds only two electrons. Therefore, these elements are most stable when they have two electrons.

Answer:

Average Mass = 107.88 amu

Explanation:

We can calculate the average mass of an element by mutlpying the mass of its isotopes by their respective relative abundance and then making a total sum. Meaning that for this case:

Answer:

The answer is Ernest Rutherford.

Answer :

Good Luck

Answer:

true

Explanation:

Answer:

Explanation:

The first two are easy:

H2O, H3O+ and OH- all exist in an equilibrium

[H3O+] = [OH-] = 10^-7 M

HCl is a strong acid so 1M of it will disassociate completely

[H3O+] = [Cl-] = 1 M

The third one is also an equilibrium as HNO2 is a weak acid. Ka is given so [HNO2] and [NO2-] can be calculated.

The fourth one is a buffer solution so its pH can be looked up to give the concentrations.

Answer:

Explanation:

H20 has pH of 7

1st reaction [H30+] = 10^-7M

[OH-] = 10^-7M

1M HCl has pH of 0

2nd reaction [H3O+] = 1M

[Cl-] = 1M

given Ka = 4.6x10^-3 = [H3O+]x[NO2-] / [HNO2]

and [HNO2] + [NO2-] = 1M

each concentration can be solved

beaker D is a buffer solution n requires more info 2 solve

Answer:

hinojosa has caught you cheating

Explanation:

ur mom

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Answer:

The correct option is (a) "0.92 V".

Explanation:

The voltage of a galvanic cell made with zinc (Zn) and aluminum (AI) is given by :

Voltage =Ered- Eoxd

Where

Ered = reduction potential

Eoxd = oxidation potential

As per reduction standard potentials, the emf of Zinc is -0.76 V  and the emf of Aluminium is -1.66 V. So,

V = 0.76 - (-1.66)

= 0.9 V

Hence, the correct option is (a) "0.92 V".

Answer: A

Explanation:

Answer:

56.52 units

Explanation:

hope that helps :)

Answer:

The correct answer is B, "Specific heat capacity of the substance."

Explanation:

I just took the test. I hope this helps!

Heat absorbed changes the bonds of the molecules or the compounds to alter their state. The specific heat capacity affects the amount of heat absorbed. Thus, option B is correct.

Specific heat capacity is defined as the amount of heat or energy absorbed by the kilogram of the solid reactant when the system experiences a rise in temperature. It is measured in J/(kg K) or J/(kg °C).

The specific heat capacity, the mass of the substance, temperature, and the phase of the substance affects the absorption of the heat from the surrounding. The specific heat affects absorption as it tells about the substance's ability to take the heat energy.

Therefore, specific heat capacity affects heat absorption.

Learn more about specific heat capacity here:

https://brainly.com/question/2530523

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the answer is B. Parasite.

Answer: 10.7 grams

Therefore, 10.7 grams of Hydrogen are necessary to fully react with 50.0 grams of Nitrogen.

Answer:

Zinc is an element.

Explanation:

Compounds are composed of two or more elements

Answer:

element

Explanation:

zinc is an element with atomic number 30

P1: 741 mmHg

V1: 3.49 L P1 x V1 / P2= (741 mmHg) (3.49 L) / 760 mmHg = 3.40 L

P2: 760 mmHg

V2: ? L

From what I know personally from learning about this type of subject in the past is that children are more susceptible to the effects of toxic substances more than adults are, certain scientific data specifically indicate that children actually are for all intents and purposes more basically susceptible to toxic exposure than adults because they for the most part have proportionally definitely more intake of food contaminants, basically active developmental processes, basically multiple exposure pathways and really susceptible kind of socio-behavioral activities in a particularly major way.

Answer:

S>0 contributes to spontaneity.

Explanation:

i just took the test on a pex :)

According to the law of thermodynamics, the relationship between entropy and the spontaneity of a reaction is S > 0.

Entropy is the total amount of energy in a closed system that is present there, but there are no uses for that energy. It is the unused energy for any work.

By the second law of thermodynamics, any spontaneous process results in an increase in the universe's overall entropy. The total of the entropy produced by the spontaneous process and the change in energy brought on by the heat flow is known as the net change in entropy of the system or S.

The reaction will be spontaneous if the delta G is negative. Delta G is the Gibbs free energy. So the entropy S will be greater that the reaction.

The Gibbs free energy equation is:

△G = △H − T△S

Thus, the relation is S > 0.

To learn more about entropy, refer to the link:

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Answer:

Nebulae are made of dust and gases—mostly hydrogen and helium. ... Eventually, the clump of dust and gas gets so big that it collapses from its own gravity. The collapse causes the material at the center of the cloud to heat up-and this hot core is the beginning of a star.

Explanation:

Hope this helps

Answer:

C2H5NO2

Explanation:

Glycine | C2H5NO2 - PubChem.

weight of glycine= 75.07 g/mol

Answer:

microwaves should be made

Answer:

answer choices plzzzzz

ima edit my answer wht are the choices

Explanation:

mrk mE BRAINLIEST PLZZZZZZZZZZZz

Answer:

When CO2 levels become excessive, a condition known as acidosis occurs. This is defined as the pH of the

blood becoming less than 7.35. The body maintains the balance mainly by using bicarbonate ions in the

blood. As the body responds to neutralize this condition, an electrolyte imbalance – an increase of plasma

chloride, potassium, calcium and sodium, can occur.

Answer: OB

Explanation:

The empirical formula of an element is the simplest formula of an element which shows the ratios of atoms of the each element present in a molecule of a compound .

Answer:

[tex]m_{Fe_2O_3}=549gFe_2O_3[/tex]

Explanation:

Hello there!

In this case, according to the given chemical reaction for this problem about stoichiometry:

[tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]

Whereas there is a 3:2 mole ratio of oxygen (molar mass = 32.0 g/mol) to iron (III) oxide (molar mass = 159.69 g/mol) and therefore, the correct stoichiometric setup is:

[tex]m_{Fe_2O_3}=165gO_2*\frac{1molO_2}{32.00gO_2}*\frac{2molFe_2O_3}{3molO_2} *\frac{159.69gFe_2O_3}{1molFe_2O_3} \\\\m_{Fe_2O_3}=549gFe_2O_3[/tex]

Regards!

Answer:

claw techniques

Explanation:

because it is

Answer:

4moles of hydrogen atoms

Explanation:

The second conversion factor reflects the number of atoms contained within each molecule. Two water molecules contain 4 hydrogen atoms and 2 oxygen atoms. A mole of water molecules contains 2 moles of hydrogen atoms and 1 mole of oxygen atoms.

Explanation:

According to the law of conservation of mass, mass can neither be created nor destroyed but it can simply be transformed from one form to another.

For example, [tex]Na^{+} + Cl^{-} \rightarrow NaCl[/tex]

Mass of Na = 23 g/mol

Mass of Cl = 35.5 g/mol

Sum of mass of reactants = mass of Na + mass of Cl

= 23 + 35.5 g/mol

= 58.5 g/mol

Mass of product formed is as follows.

Mass of NaCl = mass of Na + mass of Cl

= (23 g/mol + 35.5) g/mol

= 58.5 g/mol

As mass reacted is equal to the amount of mass formed. This shows that mass is conserved.

As a result, law of conservation of mass is obeyed.

Answer:

1. What is the coefficient for calcium in the balanced equation?

2 Ca + 5 NaOH → 4 Na + 2 Ca(OH)2

2. The burning of 20.0 g of acetylene (C2H2) produces what mass of carbon dioxide? You must

write the equation, balance it and solve the mass-mass problem.

a. Balanced equation:

2 C2H2 + 5 O2  4 CO2 + 2 H2O

Explanation: