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katrin2010 [14]
4 years ago
9

I need help with these two questions

Chemistry
1 answer:
Mila [183]4 years ago
6 0

halogens have 7

allali have 2

noble gases have 8

K = 1

P = -3

Ra= 7

Cl = -1

N = 5

O = 6

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A chemist measures the energy change Delta H during the following
Ann [662]

Answer: 1) endothernic

2) Yes absorbed

Explanation:

Decomposition is a chemical reaction in which one reactant gives two or more than two products. All decomposition reactions are endothermic reactions as energy is absorbed to break the bonds.

Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and \Delta H for the reaction comes out to be positive.

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and \Delta H for the reaction comes out to be negative.

5 0
3 years ago
6 What is the main difference between a homogeneous mixture and a heterogeneous mixture?
tangare [24]
The best answer here is B , i.e. the components of a homogenous mixture are evenly distributed This means the constituents are mixed uniformly. In a heterogeneous mixture, the constituents are not mixed uniformly. Some good examples of a homogeneous mixture are: 1. Sugar solution 2. Soda 3. Water 5. soft drinks 6. Air 7. Vinegar 8. Brine Some examples of a heterogeneous mixture are: 1. Blood 2. Milk 3.Water and oil 4. Water and sand 5. Soil 6. Hollandaise sauce 8. smog
6 0
3 years ago
P.S. This is a science question not a chemistry.
Vesnalui [34]

Answer:

B) When the tilt of the Earth causes the sun’s energy/light to be spread out over a larger area, temperatures are ______warmer______ causing _____Summer_______ to occur.

3 0
3 years ago
30.5 g of sodium metal reacts with chlorine gas to produce sodium chloride. How much (in grams) chlorine gas must react with thi
Lena [83]

Answer:

Mass of chlorine = 47.22 g

Explanation:

Given data:

Mass of sodium = 30.5 g

Mass of chlorine= ?

Solution:

Chemical equation:

 2Na + Cl₂      →      2NaCl  

Number of moles of Na:

Number of moles = mass/molar mass

Number of moles = 30.5g/ 23 g/mol

Number of moles = 1.33 mol

Now we will compare the moles of Cl ₂ with Na from balance chemical equation.

                    Na            :              Cl ₂

                     2              :               1

                     1.33          :            1/2×1.33 = 0.665 mol

Mass of chlorine gas:

Mass = number of moles × molar mass

Mass = 0.665 mol × 71 g/mol

Mass = 47.22 g

6 0
3 years ago
Which term names the side of a sand dune facing away from the wind
Vilka [71]
Your answer to this question is port side sand dune
3 0
4 years ago
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