CHEMISTRY HIGH SCHOOL

Increasing the intensity and duration of an exercise program too quickly can lead to injury.a. True
b. False

Answers

Answer 1
Answer: It is true that a sudden increase in both intensity and duration of physical exercise can result in injury. The body needs time to process any changes. Muscles need to build strength and flexibility gradually and the joints need time to acclimate to changes in pressure.
Answer 2
Answer:

this is a true statement

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When dissolved in water, all acids willA. Form hydroxide ions B. have a negative eletrical charger C. conduct eletricity D. turn blue

Answers

When dissolved in water, all acids will conduct electricity. The correct answer is C.

What is the force equation?
A. F = ma
B. F = md
C. F = m/a
D. F = m/d

Answers

A. F = mass x acceleration
its f=ma= force=mass x acceleration

A) Balance the following equations:i) PbCl2 + AgNO3 <----> AgCl + Pb (NO3) 2
ii) AlCl3 + NH4OH <----> Al(OH)3 + NH4Cl
iii) FeCl3 + Ca(OH)2 <----> CaCl2 + Fe(OH)3
iv) Pb(ClO3)2 + K2SO4 <----> PbSO4 + KClO3
v) Na + HOH <----> NaOH + H2
vi) Zn + HCl <----> ZnCl2 + H2
vii) Al + AgCH3COO <----> Al(CH3COO)3 + Ag
viii) MgO + HNO3 <----> Mg (NO3)2 + H2O
ix) MnO2 <----> Mn3O4 + O2
b) Why is it incorrect to alter the chemical formula when balancing an equation?

Answers

A-
i) PbCl_2 + 2AgNO_3 = 2AgCl + Pb(NO_3)2
ii) AlCl_3 + 3NH_4OH = Al(OH)_3 + 3NH_4Cl
iii) 2FeCl_3 + 3Ca(OH)_2 = 3CaCl_2 + 2Fe(OH)_3
iv) Pb(ClO_3)_2 + K_2SO_4 = PbSO_4 + 2KClO_3
v) 2Na + 2HOH = 2NaOH + H_2
vi) Zn + 2HCl = ZnCl_2 + H_2
vii) Al + 3AgCH_3COO = Al(CH_3COO)_3 + 3Ag
viii) MgO + 2HNO_3 = Mg(NO_3)_2 + H_2O
ix) 3MnO_2 = Mn_3O_4 + O_2

B- Because chemical formula has its own unique set of elements and subscripts

Hope this Helps :)

Why are bubbles seen in the small test tube?

Answers

Due to Chemical reaction

I have to write a 150 word paragraph or two that describes at least three everyday things that exist or occur because of science. I also have to make sure i use examples. I don't have a clue where to start ??? PLEASE help!

Answers

You can do something like natural disasters and explain why they happen

Given the balanced equation:4Fe(s) + 3O2(g) ==>2Fe2O3(s) + 1640 kJ
Which phrase best describes this reaction?
(1) endothermic with DH = +1640 kJ
(2) endothermic with DH = -1640 kJ
(3) exothermic with DH = +1640 kJ
(4) exothermic with DH = -1640 kJ

Answers

The answer is (4) exothermic with ΔH = -1640 kJ. The 1640 kJ energy is at the right side of equation means that it releases energy. The enthalpy change means the energy of production minus the energy of reactants. If it is exothermic, the ΔH < 0.
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