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.
Which property of silver chloride identifies it as a chemical compound?
O A. It is a heterogeneous substance.
O B. Its elements combine in a fixed ratio.
O c. It can be separated into its components by physical methods.
OD. Its physical properties are between that of silver and chlorine.
Answer:
D
Explanation:
because it has two or more properties
Which is an empirical formula?
1 P2O5
2 P4O6
3 C2H4
4 C3H6
P₂O₅ is an empirical formula
Further explanationGiven
compounds
Required
an empirical formula
Solution
The empirical formula is the smallest comparison of the atoms forming the compound.
Molecular formulas are formulas that show the number of atomic elements that make up a compound.
(empirical formula) n = molecular formula
1. P₂O₅ : the ratio of compounds cannot be further reduced to whole numbers⇒empirical formula
2. P₄O₆ : molecular formula
(P₂O₃)₂=P₄O₆
P₂O₃ : empirical formula
3.C₂H₄ : molecular formula
(CH₂)₂=C₂H₄
CH₂ : empirical formula
4. C₃H₆ : molecular formula
(CH₂)₃=C₃H₆
CH₂ : empirical formula
Answer:
P₂O₅
Explanation:
why is the electronic stucture written as 1s 2s 2p 3s 3p 4s. ... ?
Answer:
Because of the orbital states. In one S your able to add one elecrron and so on.What is the mass of 6.25 moles of Ca(OH)2?
Jillis climbing
Where does she need
high friction?
Answer:
The further away the centre of mass is from the wall, the more friction force is required at the hands. The more weight is shifted from the hands to the feet, the smaller is the friction force at the hands and the closer is the climber to the point of impending slippage.
Define chemical reaction
Answer:
a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.
A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
hope this helps ^^
How many grams of oxygen are there in 15.5 grams of glucose, C6H12O6?
Based on the information above, what is average speed of the toy car?
Fom/s
G 0.2 m/s
H 5 m/s
J 10 m/s
The average speed of the toy car : 0.2 m/s
Further explanationGiven
The motion of a toy car
Required
The average speed
Solution
Average speed = total distance/total amount of time ,
From the graph :
Total distance travelled : 4
Total time : 20 s
The average speed = total distance (d) : total time (s)
The avg speed = 4 : 20
The avg speed = 0.2 m/s
PLEASE HELP ASAP! WILL GIVE BRAINLIEST! PLEASE HELP!!
Lightning is seen before its associated thunder is heard. This is because light waves travel faster in air than sound waves do. Through which material would sound waves move faster than light waves?
A. Liquid Water
B. Solid Bronze Metal
C. Oxygen Gas
D. Helium Gas
Answer:
solid Bronze metal
Explanation:
Ap3x verified
Answer:
b
Explanation:
a p e x
Determine the type of light for
6.5x10^(-2)m
A.gamma rays
B.X rays
C.UV
D.IR
E.Microwave
F.Radiowaves
Answer:
hmm I would say microwave
please help me pls!!!
(HELP ME ASAP!)
Testing for Carbon Dioxide
Limewater is calcium hydroxide
solution, Ca(OH)2. It forms calcium
carbonate,CaCO3, and water when
it reacts with carbon dioxide.
limewater
a Write a word equation for this
b Why does limewater go milky
when carbon dioxide is bubbled
through it?
Question 1
Which statement about human activity and the environment is NOT true?
Humans knowingly create environmental disasters.
Humans affect ecosystems in many ways.
e
Humans can create solutions to disasters.
o
Humans have altered ecosystems for a long time.
The statement about human activity and the environment that is NOT true is:
A. Humans knowingly create environmental disasters.
Environmental disaster:An environmental disaster is usually understood as an irreversible change in the natural complex, which can lead to the death of living beings. It states that these can be even the smallest species of organisms.
Examples of environmental disasters include wildfires, landslides, floods, earthquakes, droughts, tornadoes, tsunamis, and volcanic eruptions.
Thus, option A is correct.
Find more information about environmental disasters here:
brainly.com/question/26342911
DESPERATE WILL GIVE BRAINLIST AND THANKS
Mitosis is involved with growth while meiosis is involved with reproduction.
True
False
Describe one physical property and one chemical property of sodium that you observed.
Answer:
It's a soft metal, reactive and with a low melting point, with a relative density of 0,97 at 20ºC (68ºF). From the commercial point of view, sodium is the most important of all the alkaline metals. Sodium reacts quickly with water, and also with snow and ice, to produce sodium hydroxide and hydrogen.
Explanation:
Hope this Helps
An ice hockey puck travels 18m in 3s before it slides into the goal.What is the speed of the traveling puck?
Answer: 6m/s
Explanation:
Speed is calculated as distance divided by time. Therefore, the speed of the traveling puck would be calculated as the distance travelled by the hockey puck divided by the time taken. This will be:
= 18m / 3s
= 6m/s
The answer is 6 meters per second
what is the driving force for the movement of earths plates?
In every chemical reaction that produce energy, ____ react with ________ ?
Answer:
Acid reacts with water?
Explanation:
How is ionic radius
measured?
Answer:
The radius of an atom can only be found by measuring the distance between the nuclei of two touching atoms, and then halving that distance. The type of atomic radius being measured here is called the metallic radius or the covalent radius depending on the bonding.
Explanation:
(Pls mark me brainliest if you can)
How many neutrons are in atom of an element that has 16 protons, 16 electrons, and a mass of 40?
Answer:
8
Explanation:
i dunno i think its right tho
Platinum Abundance missing 198 and 195
Platinum Isotope (amu) Percent Abundance
194
195
34%
196
25%
198
What is the percent abundance of Pt-194, if the average atomic mass of platinum is 195.16 and platinum has only four naturally
occurring isotopes?
es)
A)
8%
B)
25%
33%
D)
50%
PLEASE HELP DUE TODAY
WILL GIVE ALL POINTS IF COMPLETED
lmk in the comments section if ur gonna do it dont use the answer
.........................
Q6
a) HCl dipole-dipole --> higher
I2 london dispersion
b) CH3F H-bonding --> higher ( higher Molecular mass)
CH3OH H-bonding
c) H2O H-bonding --> higher
H2S dipole-dipole
d) SiO2 dipole-dipole --> higher (the difference is higher in the electronegativity )
SO2 dipole-dipole
e) CH3OH H-bonding
CuO ionic-dipole --> higher because it is ionic compound
f) NH3 H-bonding (higher)
CH4 london dispersion
g) HCl dipole-dipole
NaCl ionic dipole--> HIGHER ionic compound
h) SiC london dispersion
Copper metallic bond --> higher
how many kilograms of solvent would contain 0.43 mol of CaO in a 2.5 molality solution
0.024 kg CaO
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Aqueous Solutions
Molarity = moles of solute / liters of solutionAtomic Structure
Reading a Periodic TablesUsing Dimensional AnalysisExplanation:Step 1: Define
0.41 mol CaO
2.5 M Solution
Step 2: Identify Conversions
1000 g = 1 kg
Molar Mass of Ca - 40.08 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of CaO - 40.08 + 16.00 = 56.08 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 0.43 \ mol \ CaO(\frac{56.08 \ g \ Cao}{1 \ mol \ CaO})(\frac{1 \ kg \ CaO}{1000 \ g \ CaO})[/tex]Multiply: [tex]\displaystyle 0.024114 \ kg \ CaO[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs as our lowest.
0.024114 kg CaO ≈ 0.024 kg CaO
Answer:
0.172 Kg
Explanation:
Given data:
Kg of solvent = ?
Moles of solute = 0.43 mol
Molality = 2.5 m
Solution:
Formula:
m = moles / Kg of solvent
by putting values,
2.5 m = 0.43 mol / kg of solvent
Kg of solvent = 0.43 mol / 2.5 m
Kg of solvent = 0.172 Kg
Why is the cell theory so important??
Answer:
yes
Explanation:
The cell theory states that all biological organisms are composed of cells; cells are the unit of life and all life come from preexisting life. The cell theory is so established today that it forms one of the unifying principles of biology.
Water is sometimes called the universal solvent because it is a polar molecule that dissolves many substances. which of the following is soluble in water?
A. Ice
B. Metals
C. Oils
D. Salts
Answer: Salts
Explanation: Salts easily dissolve in water. Salts are always ionic bonds, meaning they dissolve easily.
Ice does not technically dissolve in water since ice is made of water. You can't dissolve a substance in itself.
Metals are obviously not able to dissolve either in water.
Oils do not mix with water, they float on water, meaning they are immiscible.
A teacher moves a box of books weighting 25lbs a distance of 40ft. How much work has she done?
Answer:
[tex]workdone = weight \: \times \: distance \\ = 25 \times 40 \\ = 1000 \: lbsft \\ or \\ = 1000 \: joules[/tex]
Which of these is the basic unit of mass?
OL
cm
O mi
kg
NCYT OLISTION
Answer:
Kg
Explanation:
Answer:
Kilograms(SI unit for mass) 10^3
Explanation:
Zn + 2HCI -> ZnCl2 + H2
a. How many moles of ZnCl, can be made from 1.7g of Zn?
b. If 6.4 grams of HCl are used in this reaction, how many moles of ZnCl, are
produced?
Answer:
0.02740 moles ZnCl2
0.8777 moles ZnCl2
Explanation:
a) How many moles of ZnCl, can be made from 1.7g of Zn?
First we need to convert from grams of Zn to moles of Zn, and then from moles of Zn to moles of ZnCl.
We will use the atomic weight of Zn to do this..
Atomic weight is 65.38 g Zn/1 mol Zn, this can also be written as
1 mol Zn/65.38mol Zn... We will now convert:
1.76 g Zn * [tex]\frac{1 mol Zn}{65.38 g Zn}[/tex] = 0.0273784032 moles Zn
Now we'll use the balanced chemical equation to convert from moles of Zn to moles of ZnCl..
Zn + 2HCl -> ZnCl2 + H2
We can see that for every mol of Zn that reacts, 1 mol of ZnCl2 is produced..
So:
0.0273784032 moles Zn * [tex]\frac{1 mol ZnCl2}{1 mol Zn}[/tex] = 0.0273784032 moles ZnCl2
This can be estimated to 0.0274 moles ZnCl2
__________________________________________________________
b) If 6.4 grams of HCl are used in this reaction, how many moles of ZnCl, are
produced?
First we need to convert form grams of HCl to moles of HCl, and then to moles of ZnCl...
We'll do this using the atomic weight of HCl (36.458 g/mol or 1 mol/36.458 g)
6.4 g HCl * [tex]\frac{1 mol HCl}{36.458 g HCl}[/tex] = 0.1755444621 mol HCl
Now we'll use the balanced chemical equation to convert from moles of HCl to moles of ZnCl..
Zn + 2HCl -> ZnCl2 + H2
We can see that for every 2 moles of HCl that react, 1 mol of ZnCl2 is produced..
So:
0.1755444621 mol HCl * [tex]\frac{1 mol ZnCl2}{2 mol HCl}[/tex] = 0.877722311 moles ZnCl2 are produced.
This can be estimated to 0.8777 moles ZnCl2
Calculate the pH of a solution with [+]= 1x 10^-6
12
28.01
6
14
When examining features on the ocean floor, like a volcano, how would it appear?
severely eroded
only somewhat eroded
not eroded at all
barely eroded compared to land volcanoes
Answer:
barely eroded compared to land volcanoes
Explanation:
the other person is wrong