What was henri becquerel studying when he accidentally discovered radioactivity?

Answers

Answer 1

Answer: He was looking at Uranium Salts

Answer 2

Answer:

Henri Becquerel was studying properties of x-rays

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When a covalent bond forms between atoms, electrons are a. lost. b. gained. c. shared. d. transferred.?
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Balance this chemical equation: Fe(s) + O2(g) ----> FeO(s) *The 2 is in subscript

What is the oxidation state of nitrogen in thecompound NH4Br?
(1) –1 (3) –3
(2) +2 (4) +4

Answers

Answer : The oxidation number of nitrogen (N) is, (-3)

Explanation :

Oxidation number : It represent the number of electrons lost or gained by the atoms of an element in a compound.

Oxidation numbers are generally written with the sign (+) and (-) first and then the magnitude.

When the atoms are present in their elemental state then the oxidation number will be zero.

Rules for Oxidation Numbers :

The oxidation number of a free element is always zero.

The oxidation number of a monatomic ion equals the charge of the ion.

The oxidation number of Hydrogen (H) is +1, but it is -1 in when combined with less electronegative elements.

The oxidation number of oxygen (O) in compounds is usually -2, but it is -1 in peroxides.

The oxidation number of a Group 1 element in a compound is +1.

The oxidation number of a Group 2 element in a compound is +2.

The oxidation number of a Group 17 element in a binary compound is -1.

The sum of the oxidation numbers of all of the atoms in a neutral compound is zero.

The sum of the oxidation numbers in a polyatomic ion is equal to the charge of the ion.

The given compound is, $NH_4Br$

Let the oxidation state of 'N' be, 'x'

$x+4(+1)+(-1)=0\n\nx+4-1=0\n\nx+3=0\n\nx=-3$

Therefore, the oxidation number of nitrogen (N) is, (-3)

The answer is (3) -3. We can know that typically Br has the oxidation state of -1. And the H always has the oxidation state of +1. The total formula needs to have zero oxidation state. So the nitrogen is -3.

What is the level of co2 in solo (soft drink)?

Answers

The fizz in a soda is caused by the carbon dioxide dissolved in the liquid. The amount of carbon dioxide dissolved in the a solo can not be found in the internet. This might be a secret of the company and it is only them who knows this but surely the level of CO2 is still in a safe for consumption level.

Which statement best describes why carbon can form a wide variety of organic compounds?Each carbon atom ionically bonds with atoms of carbon, hydrogen, oxygen, and nitrogen.

Each carbon atom covalently bonds with atoms of carbon, hydrogen, oxygen, and nitrogen.

Each carbon atom ionically bonds with atoms of oxygen and nitrogen.

Each carbon atom covalently bonds with atoms of oxygen and nitrogen.

Answers

Carbon can form a wide variety of organic compounds because:

Each carbon atom covalently bonds with toms of carbon, hydrogen oxygen, and nitrogen

A carbon atom can have 4 single valence electrons around it. This allows it to form covalent bonds with many different atoms.

Each carbon atom covalently bonds with atoms of carbon, hydrogen, oxygen, and nitrogen describes why carbon can form a wide variety of organic compounds. thus, option B is correct.

What is valency?

Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell.

Carbon can form a wide variety of organic compounds because Each carbon atom covalently bonds with atoms of carbon, hydrogen oxygen, and nitrogen. a carbon atom can have 4 single valence electrons around it. This allows it to form covalent bonds with many different atoms.

Learn more about the valency of carbon here:

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Which of the following elements has the greatest atomic radius?A. potassium (K)
B. arsenic (As)
C. bromine (Br)
D. calcium (Ca)

Answers

Answer:

A. Potassium (K)

Explanation:

The trend of atomic radius goes:

As group number increases, radius decreases

As period number increases, radius increases

Answer:

francium

Explanation:

Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.

An experimental procedure requires 10 ml of acid to be dissolved into a beaker of water. An additional 5 ml of acid is added to the solution. Which statement best describes the new solution? the strength of the acid in the solution has been increased the concentration of acid in the solution has decreased by one half the concentration of acid in the solution has been increased the strength of the acid in the solution has decreased by one half

Answers

Answer:

The correct statement is that the concentration of the acid in the solution will increase.

Explanation:

On the basis of the given question, if one dissolves 10 milliliters of acid in a beaker of water, the acid will get diluted. As the number of moles of acid is not going to change, thus, one can use the formula:

M1V1 = M2V2

Here, M is the concentration of the acid in the solution,

V1 = 10 ml

V2 = V water + 10

If we supplement, an other 5 ml of acid, the new concentration of the acid will be:

M = M1 (5 ml) + M2 (Vwater + 10 ml) / (5 ml + V water + 10 ml)

Therefore, the concentration of the acid in the new solution will increase.

Answer:

the concentration of acid in the solution has been increased.

Explanation:

the answer is C on edge.

Elements can combine to form molecules, like o2 or co2. elements combine to form molecules and these elements are joined together by a. chemical bonds.
b. nuclear energy.
c. sharing nuclei.
d. attractive forces.

Answers

Elements can combine to form molecules, like o2 or co2. elements combine to form molecules and these elements are joined together by chemical bonds i.e covalent bond in this molecule so option A is correct
hope this helps

Answer:

a. Chemical bonds.

Explanation:

Hello,

In this case, it is necessary to know that when two elements are not stable by their own they should bond with an other atom of the same element via chemical bonds whereby the valence electrons act as bridges connecting the atoms. Some examples are diatomic-gaseous hydrogen, oxygen, nitrogen, chlorine, iodine, fluorine and bromine. Moreover, such chemical bonding is represented by lines binding the elements as shown on the attached picture.

Best regards.

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