All categories

2 years ago

Activity 7: Crossword Puzzle

Chemistry

1 answer:

Natasha_Volkova [10]2 years ago

5 0

Answer: 2. with two symmetrical shells - mirror images of each other.

the term "crinoid" means: 6. phylum where starfish and sea urchins belong

4. lived inside their shells: 1. exoskeletons are made up of this material

7. multicellular organisms that often live in colonies: 8. individuality of coral is called

Explanation:

Crinoid is a term that can be used to describe the radial symmetry of animals that have oral (side of mouth) and aboral surfaces (opposite to the mouth). It is characterized by the mouth at the top surface and surrounded by the arms for feeding it. This is a characteristic feature of animals like star fish and sea urchins and echinoderm animals.

The exoskeleton is a protective shell which protect the animal from the external environment like water, sunlight and predation.

The multicellular organisms that live in the colonies they form coral reef and individually the are called the coral polyp.

You might be interested in

Balance: Fe2(SO4)3 + _K[OH] —> _K2[SO4] + K[SO] + Fe[OH]3

LenKa [72]

Balance the reaction of Fe2(SO4)3 + KOH = K2SO4 + Fe(OH)3 using this chemical equation balancer! ... Fe2(SO4)3 + 6KOH → 3K2SO4 + 2Fe(OH)3 ...

Missing: _K[ ‎| Must include: _K[

6 0

2 years ago

Read 2 more answers

Calculate the percentage of each element in acetic acid, hc2h3o2, and glucose, c6h12o6.

My name is Ann [436]

Acetic acid, HC2H3O2

First, calculate for the molar mass of acetic acid as shown below.
M = 1 + 2(12) + 3(1) + 2(16) = 60 g

Then, calculating for the percentages of each element.
 Hydrogen:
P1 = ((4)(1)/60)(100%) = 6.67%

 Carbon:
P2 = ((2)(12)/60)(100%) = 40%

Oxygen
P3 =((2)(16) / 60)(100%) = 53.33%

Glucose, C6H12O6

The molar mass of glucose is as calculated below,
6(12) + 12(1) + 6(16) = 180

The percentages of the elements are as follow,
 Hydrogen:
P1 = (12/180)(100%) = 6.67%

Carbon:
P2 = ((6)(12) / 180)(100%) = 40%

Oxygen:
P3 = ((6)(16) / 180)(100%) = 53.33%

b. Since the empirical formula of the given substances are just the same and can be written as CH2O then, the percentages of each element composing them will just be equal.

6 0

3 years ago

From what material does an extrusive rock form

Tom [10]

Lava I think try that hope it helps :)

3 0

2 years ago

Read 2 more answers

Uranium has an atomic number of 92. How many neutrons does U-238 have?

LekaFEV [45]

Answer:

146 neutrons.

Explanation:

8 0

2 years ago

In the United States, barometric pressures a re generally reported in inches of mercury (in. Hg). On a beautiful summer day in C

Svetllana [295]

Answer:

773.43 torr

Explanation:

From the question given above, the following data were obtained:

Pressure (in inHg) = 30.45 inHg

Pressure (in torr) =?

We can convert 30.45 inHg to torr by doing the following:

1 inHg = 25.4 torr

Therefore,

30.45 inHg = 30.45 inHg × 25.4 torr / 1 inHg

30.45 inhg = 773.43 torr

Thus, 30.45 inhg is equivalent to 773.43 torr

7 0

2 years ago