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Aneli [31]
4 years ago
12

Description of an exothermic reaction?

Chemistry
2 answers:
Karolina [17]4 years ago
7 0

Answer:

An exothermic reaction is a chemical reaction in which less energy is needed to break bonds in the reactants than is released when new bonds form in the products.

Explanation:

beks73 [17]4 years ago
3 0

lighting a candle,  An initial input of energy causes oxygen and wax react to produce carbon dioxide, water, and heat.

Explanation:

During an exothermic reaction, energy is constantly given off, often in the form of heat, combustion is the best example of this

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How many mL of water would be displaced by 408 g of lead?
Galina-37 [17]

Answer:

36 mL of water can be displace by the 408 g lead

Explanation:

Given data:

Mass of lead = 408 g

Volume of water displaced by lead = ?

Solution:

The volume of water displace by the lead would be equal to the given volume of lead.

So we will calculate the volume from given mass of lead from density formula.

Density:

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

D=m/v

D= density

m=mass

V=volume

Density of lead is 11.36 g/cm³.

d = m/v

11.36 g/cm³ = 408 g/ v

v = 408 g/ 11.36 g/cm³

v =36 cm³

1 cm³  = 1 mL

volume = 36 mL

36 mL of water can be displace by the 408 g lead.

4 0
4 years ago
If one body is positively charged and another body is negatively charged, free electrons tend to
Naily [24]
I think the correct answer is A. If one body is positively charged and another body is negatively charged, free electrons tend to <span>move from the negatively charged body to the positively charged body. This happens because they have different charges and therefore electrons are more attracted to the positive or its opposite charge.</span>
4 0
3 years ago
Read 2 more answers
Hard water often contains dissolved Ca2+ and Mg2+ ions. One way to soften water is to add phosphates. The phosphate ion forms in
dalvyx [7]

Answer:

30 g

Explanation:

<em>For CaCl₂</em>

3CaCl₂ + 2Na₃PO₄ ⟶ Ca₃(PO₄)₂ + 6NaCl

Moles of CaCl₂ = <em>c</em>×<em>V</em> = 5.0 × 10⁻² × 2.0 = 0.100 mol

Moles of Na₃PO₄ = 0.100 × 2/3 = 0.0667 mol

Mass of Na₃PO₄ = 0.0667 × 163.94 = 10.9 g

———————————————————

<em>For Mg(NO₃)₂ </em>

3Mg(NO₃)₂  + 2Na₃PO₄ ⟶ Mg₃(PO₄)₂ + 6NaCl

Moles of Mg(NO₃)₃ = <em>c</em>×<em>V</em> = 8.5 × 10⁻² × 2.0 = 0.170 mol

Moles of Na₃PO₄ = 0.170 × 2/3 = 0.113 mol

Mass of Na₃PO₄ = 0.113 × 163.94 = 1 g

—————————————————

Total mass of Na₃PO₄ = 10.9 + 18.6 = 29.5 g

To two significant figures, mass = 30 g

6 0
3 years ago
PLS HELP ASAP I DONT HAVE TIME
11Alexandr11 [23.1K]

Answer:

An autotroph absorbs sunlight from their stoma and converts this solar energy to chemical energy with their chloroplasts. As you can see, the sun's interaction of matter and energy is vital to sustaining all living things on Earth.

Explanation:

5 0
3 years ago
In a neutralization reaction with a strong acid or base, all of the hydrogens from the acid and the hydroxides from the base rea
masya89 [10]

Answer:

H3PO4 + 3NaOH ----> Na3PO4 + 3H2O

Explanation:

The balanced equation is given below

H3PO4 + 3NaOH ----> Na3PO4 + 3H2O

7 0
3 years ago
Read 2 more answers
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