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2 years ago

PLEASE HELP!!!!!!!! giving brainlist

Chemistry

2 answers:

elena55 [62]2 years ago

7 0

Hot to cold thermal radiation

Bas_tet [7]2 years ago

4 0

Answer:

I can only give the answer for the first page.

Explanation:

1. Thermal energy always moves from hot objects to cold objects.

2. When two states of matter reach the same temperature, it is called thermal equilibrium.

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What is the oxidation number of cl− in the hypochlorite ion clo−?

mariarad [96]

Answer : The oxidation number of chlorine (Cl) is, (+1)

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, $ClO^-$

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

$x+(-2)=-1\\\\x-2=-1\\\\x=+1$

Therefore, the oxidation number of chlorine (Cl) is, (+1)

5 0

3 years ago

NEED ANSWER ASAP! How many grams are in 1.50 moles of bromine liquid?

padilas [110]

Answer:

119.85 grams Br or 120. grams Br (sig figs)

Explanation:

1.50 moles Br 79.90 g Br

--------------------- x ------------------------ = 119.85 grams Br or 120 grams Br (sig figs)

1 mole

7 0

3 years ago

Help I need an answer today

Ivahew [28]

Here you are! I hope it helps, and also for the ones I put a red ‘x’ it depends on how you round it.

5 0

3 years ago

Read 2 more answers

Consider a mixture of 10 billion 02 molecules and 10 billion H2 molecules. In what way is this mixture similar to a sample conta

sashaice [31]

Explanation:

Number of oxygen molecules = 10 billion = $10^9$

Number of hydrogen molecules = 10 billion = $10^9$

Number of molecules of hydrogen peroxides = 10 billion = $10^9$

Moles of oxygen gas : $n_{o_2}$

$\frac{10^9}{N_A}=\frac{10^9}{6.022\times 10^{23} mol^{-1}}=1.6605\times 10^{-15} mol$

Moles of hydrogen gas : $n_{H_2}$

$\frac{10^9}{N_A}=\frac{10^9}{6.022\times 10^{23}mol^{-1}}=1.6605\times 10^{-15} mol$

$n_{O_2}=n_{H_2}$

Moles of hydrogen gas : $n_{H_2O_2}$

$\frac{10^9}{N_A}=\frac{10^9}{6.022\times 10^{23}mol^{-1}}}=1.6605\times 10^{-15} mol$

$n_{O_2}=n_{H_2}-n_{H_2O_2}$

Number of moles in hydrogen gas, oxygen gas and hydrogen peroxide is same.

Total number of atoms in $10^6$ molecules of oxygen:

$2\times 10^6$ (2 atoms in 1 molecule)

Total number of atoms in $10^6$ molecules of hydroegn :

$2\times 10^6$ (2 atoms in 1 molecule)

Total number of atoms in $10^6$ molecules of hydrogen peroxide:

$4\times 10^6$ (4 atoms in 1 molecule)

Number of oxygen atoms and number of hydrogen atoms are equal but individually they are not equal to number of atoms in hydrogen peroxide.

5 0

3 years ago

Curious Carl conducted an experiment on the eating habits of black bears. While living in the woods, Carl was able to record the

Gnom [1K]

Answer:

Explanation:

I just got it correct.

6 0

3 years ago

Read 2 more answers