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Alchen [17]
3 years ago
11

Object A at 40.°C and object B at 80.°C are placed in contact with each other. Which statement describes the heat flow between t

he objects?
(1) Heat flows from object A to object B.
(2) Heat flows from object B to object A.
(3) Heat flows in both directions between the objects.
(4) No heat flow occurs between the objects.
Chemistry
1 answer:
kvasek [131]3 years ago
3 0
(2) Heat flows from object B to object A.
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Balance this equation. If a coefficient of "1" is required, choose "blank" for that box.
Kitty [74]

Answer: 2 C2H4 + 6 O2 => 4 CO2 + 4 H2O

Explanation:The coefficient are as follows: 2: 6: 4: 4

Each atom on the reactant and product side are equal.

Reactant Product

C 2x2 = 4 4x1 = 4

H 2x4 = 8 4x2 = 8

O 6x2 = 12 (4x2) + 4 = 12

7 0
3 years ago
Idk how to do this at all!!!
sergey [27]
Hello there!

I am not really sure which part you are talking about but let me answer some of them.

First, you need to read the information they gave you about glucose etc..

13- What is produced in photosynthesis?
"Photosynthesis is essential for all life on earth, because it provides food and oxygen."

Thus, the answer is: Photosynthesis produced food and oxygen.

14- What is the glucose used for?
"The glucose produced is used by the plant for energy and growth."

Thus, the answer is: The glucose used for energy and growth of the plants.

15- What is the oxygen used for?
"The oxygen produced is released into the air for us to breath."

Thus, the answer is: The oxygen used for us to breath.


I hope this helps!

Let me know if you have questions about the answer.

 
3 0
3 years ago
Product testing claims are called?
Tema [17]

Explanation:

They are called consumer testing or comparative testing, is a process of measuring the properties or performance of products. ... Product testing might be accomplished by a manufacturer, an independent laboratory, a government agency, etc. Often an existing formal test method is used as a basis for testing

hope this helps

7 0
3 years ago
Read 2 more answers
3. Suppose you wanted to design an experiment to test the composition of a mixture that includes sodium phenoxide (NaC6H5O). You
Liula [17]

Answer:

21.5mL of a 0.100M HCl are required

Explanation:

The sodium phenoxide reacts with HCl to produce phenol and NaCl in a 1:1 reaction.

To solve this question we need to find the moles of sodium phenoxide. These moles = Moles of HCl required to reach equivalence point and, with the concentration, we can find the needed volume as follows:

<em>Mass NaC6H5O:</em>

1.000g * 25% = 0.250g NaC6H5O

<em>Moles NaC6H5O -116.09g/mol-</em>

0.250g NaC6H5O * (1mol/116.09g) = 2.154x10⁻³ moles = Moles of HCl required

<em>Volume 0.100M HCl:</em>

2.154x10⁻³ moles HCl * (1L/0.100mol) = 0.0215L =

<h3>21.5mL of a 0.100M HCl are required</h3>
4 0
3 years ago
Write an equation that shows the formation of a copper (I) ion from a neutral copper atom
kumpel [21]
Cu ----> Cu(+) + 1 e-
5 0
3 years ago
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