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2 years ago

I need help with this

Chemistry

1 answer:

Ksenya-84 [330]2 years ago

4 0

answer:

13. c

14. prophase

15. centrosome

16. spindle fibers

17. d

18. cleavage furrow

19. d-a-f-c-e-b

20. 2 daughter cells

21. cell plate and cleavage furrow

22. prophase

23. metaphase

24. anaphase

25. telophase

i got answers for more, but doesnt show in the image. these answers are from ur teacher.

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How many molecules of water are produced by the combustion of 3.00 g of methane

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3 years ago

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Calculate the pH for the following weak acid. A solution of HCOOH has 0.12M HCOOH at equilibrium. The Ka for HCOOH is 1.8×10−4.

Shtirlitz [24]

Answer:

the pH of HCOOH solution is 2.33

Explanation:

The ionization equation for the given acid is written as:

$HCOOH\leftrightarrow H^++HCOO^-$

Let's say the initial concentration of the acid is c and the change in concentration x.

Then, equilibrium concentration of acid = (c-x)

and the equilibrium concentration for each of the product would be x

Equilibrium expression for the above equation would be:

$\Ka= \frac{[H^+][HCOO^-]}{[HCOOH]}$

$1.8*10^-^4=\frac{x^2}{c-x}$

From given info, equilibrium concentration of the acid is 0.12

So, (c-x) = 0.12

hence,

$1.8*10^-^4=\frac{x^2}{0.12}$

Let's solve this for x. Multiply both sides by 0.12

$2.16*10^-^5=x^2$

taking square root to both sides:

$x=0.00465$

Now, we have got the concentration of $[H^+] .$

$[H^+] = 0.00465 M$

We know that, $pH=-log[H^+]$

pH = -log(0.00465)

pH = 2.33

Hence, the pH of HCOOH solution is 2.33.

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3 years ago

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before we begin, let's first establish an understanding of basic terminology. it may be harder than you think to clearly define

Dennis_Churaev [7]

Contains chemical : vitamin b12, oranges, grapes, protein

chemical reaction is : neutralization, combustion, bleaching, photosyntheis

Neither : sunlight, rainbow, heat.

chemical is a substance
Chemical reaction is a rocess during which chemical bonds between atoms are broken and new ones are formed. Producing one or more different substances.
reactant is a starting materials in a chemical reaction
product is new substances that are formed in a chemical reaction
chemical equation is representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products.
combustion reaction is a chemical reaction that occurs when a substance reacts with oxygen, releasing energy in the form of heat and light

To know more about Chemical reaction visit : brainly.com/question/3461108

#SPJ4

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1 year ago