Which compound forms a powerful acid and contains a halogen

Answer:

Bromine (BR2)

Explanation:

Cl2 + Br2 = ClBr

Answer:

#2, 4, & 5

Explanation:

In number 1 there are unequal Cu's

In number 3 there are unequal Cl's

Answer:

B,D,E

Explanation:

Answer:

the mass will sink.

Explanation:

because the block of material is still more dense.

Answer:

at first click done,

A: exponential

then, i just put 0.5, and somewhat close.

Explanation:

edge 2021!!!

Answer:

option c

Explanation:

neutros equal to mass num - atomic num

An atom can be defined by its properties:

An isotope is represented by the general notation of [tex]_Z^A\textrm{Y}[/tex], where X is the symbol of an element.

Mass number = Numer of protons + Number of neutrons

Put the value in the above formula.

[tex]\Rightarrow \text{Mass number}=3+5[/tex]

[tex]\Rightarrow \text{Mass number}=8[/tex]

The isotopic representation of the chemical specie is [tex]_3^8\textrm{Li}[/tex]. So, the correct option is C.

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Answer:

Students heat up a metal sample by placing it into a test tube suspended in boiling water. Since the water is boiling, the metal evnetually reaches the same temperature as the boiling water: 100oC. ... Putting the metal sample directly into the water – obviously – gets it wet.

The metal is heated in a dry test tube in order to measure the capacity of the metal.

When performing a chemical experiment, it is important to

Instead of putting the metal straight into the boiling water, it is necessary to measure the capacity by heating it in a dry test tube first.

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Answer: below -45

Explanation:

Answer:

1.55×10²² molecules.

Explanation:

We'll begin by calculating the number of mole in 5.32 g of pure lead (Pb). This can be obtained as follow:

Mass of Pb = 5.32 g

Molar mass of Pb = 207 g/mol

Mole of Pb =?

Mole = mass /molar mass

Mole of Pb = 5.32/207

Mole of Pb = 0.0257 mole

Finally, we shall determine the number of molecules in 0.0257 mole of Pb. This can be obtained as follow:

From Avogadro's hypothesis,

I mole of Pb contains 6.02×10²³ molecules.

Therefore, 0.0257 mole will contain = 0.0257 × 6.02×10²³ = 1.55×10²² molecules.

Therefore, 5.32 g of pure lead (Pb) contains 1.55×10²² molecules.

Explanation:

They are indeed placed from the far left hand side of the periodic table in almost the same column. If you step around the table between left to right, the movement of electrons rises by one. When you progress down the line, the number of power increases by the one.

Answer:

a) 0.30

Explanation:

Kc = [C] [D] / ([A] [B])

Set up an ICE table:

[tex]\left[\begin{array}{cccc}&Initial&Change&Equilibrium\\A&0.4&-x&0.4-x\\B&0.4&-x&0.4-x\\C&0&+x&x\\D&0&+x&x\end{array}\right][/tex]

Plug in values and solve:

9 = x² / (0.4 − x)²

3 = x / (0.4 − x)

1.2 − 3x = x

1.2 = 4x

x = 0.3

Answer:

5.30x10²³g

Explanation:

A mole can be understood as an amount of something.

One mole of eggs are 6.022x10²³ eggs

One mole of atoms are 6.022x10²³ atoms

One mole of molecules are 6.022x10²³ molecules

And 1 mole of M&M are 6.022x10²³ M&M. As 1 M&M weighs 0.88g, 1 mole will weigh:

0.88g*6.022x10²³ =

One mole of M&Ms will weigh  5.3 x 10²³ grams.

The given parameters

One mole of every substance contains 6.022x10²³ atoms of the substance.

Weight of an M&M, implies an atom of M&M.

1 atom --------- 0.88 grams

 6.022x10²³ atoms = ?

= 0.88 g x  6.022x10²³

= 5.3 x 10²³ grams.

Thus, one mole of M&Ms will weigh  5.3 x 10²³ grams.

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Answer: cause oxegeon is harmful then helium

Explanation:

Answer:

The atomic number stands for the number of protons in an atom of the element.

The number of protons determines the identity of the element,

So the atomic number identifies the element. GOOD LESSONS ♡

Answer:

alkali metals

Explanation:

s block elements are also called alkali metals

Answer:

C. 64

Explanation:

Given:

The number of equally likely sample outcomes of a single stage = 4

Unknown:

Total number of elements if there are three stages= ?

Solution;

Probability is the likelihood of an event to occur.

  In this problem;

      For a single stage, the likely outcome is 4

So therefore;

   For the 3 stages 4 x 4 x 4 = 64

Therefore, the total number of elements in the sample space of an experiment with 3 stages is 64

Answer:gamma rays

Explanation:

Answer:

The wheel size does not affect the speed of the skateboard.

Explanation:

This is true because Nikki's average time goes up while Lisa's goes down, so it depends on how hard they are pushing the skateboard with their foot.

Answer:

nitrogen 18

nitrogen has an atomic number of 7

Answer:

C.

Explanation:

The movement of the bow is Kinetic Energy.

Answer: C. Kinetic energy to sound energy

Explanation: The vibration of the string is kinetic energy that transforms into sound energy.

Answer:

Change in temperature = ΔT = 26.8°C

Explanation:

Given data:

Heat absorbed = 600 j

Mass = 25.0 g

Specific heat capacity = 0.897j /g°C

Change in temperature = ΔT= ?

Solution:

Formula:

q = mcΔT

600 j =  25.0 g ×0.897 j/g°C×ΔT

600 j =  22.425 j/°C×ΔT

ΔT = 600 j /22.425 j/°C

ΔT = 26.8°C

Answer:

Matter is classified into two broad categories, namely, pure substances and mixtures. Mixtures can be separated into pure substances by physical methods. Pure substances are further divided into categories as elements and compounds. ... A pure substance can be either an element or a compound.

Explanation:

Answer:

Holmium

Explanation:

Electronic configuration:

             [Xe] 6s² 4f⁵ 5d⁶

To know this element, we must first find the atomic number and then look for its position on the periodic table.

     Number of electrons in [Xe] = 54;

  So the total number of electrons  = 54 + 2 + 5 + 6 = 67

This element has an atomic number of 57. On the periodic table, it is Holmium

Explanation:

Some examples of colorful light emissions are street lights, neon signs and, of course, fireworks. Neon signs emit light when an electric current passes through the neon gas.

Answer:

Ammonia > Urea > Ammonium nitrate > Ammonium sulphate

Explanation:

Percentage by mass of nitrogen in NH3:

Molar mass of NH3= 17 g/mol

Hence % by mass = 14/17 × 100 = 82.35%

% by mass of NH4NO3

Molar mass of NH4NO3 = 80.043 g/mol

Hence; 28/80.043 × 100 = 34.98%

% by mass of (NH4)2SO4;

Molar mass of (NH4)2SO4= 132.14 g/mol

Hence; 28/132.14 × 100 = 21.19%

% by mass of CH4N2O

Molar mass of urea = 60.0553 g/mol

Hence 28/60.0553 × 100 = 46.62%

Answer:

metal

Explanation:

Answer:

The correct answer is "The β-sheet is a type of secondary structure that fulfills the hydrogen bonding requirements of amino acid side chains".

Explanation:

Hydrogen bonding are among the most common chemical bonds that occur between amino acids, where one atom of an amino acid acts as an hydrogen donor and the other acts as hydrogen acceptor. It is not true that β-sheet fulfills the hydrogen bonding requirements of amino acid side chains. β-strands are directional and form hydrogen bonds in antiparallel, parallel, or mixed arrangements. In the parallel form adjacent amino acids do not form hydrogen bonds, but they bond with the residues that flank the other.

The statement related to β-sheet that is considered to be false is that it should be the type of the secondary structure.

It is the bonding that should be arise mainly with the chemical bonds that lies between the amino acids where one atom should be acted as the donor of hydrogen and the other should be like an acceptor of hydrogen. Also, β-strands should be considered as directional and create the hydrogen bonds in the anti-parallel or mixed arrangements.

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