How does skin defend the body against pathogens?
A. It destroys pathogens with digestive acids.
B. It produces white blood cells that attack pathogens.
C. It blocks pathogens from getting inside the body.
D. It uses tiny hairs to trap pathogens.
Answers
Related Questions
k2co3 major species present when dissolved in water
Answers
When K2CO3 is dissolved in H2O (water) it will dissociate (dissolve) into K+ and CO3 2- ions. To show that they are dissolved in water we can write (aq) after each. The (aq) shows that they are aqueous – dissolved in water.
The major species present in the solution when K₂CO₃ dissolved in water are K⁺, CO₃²⁻ , and HCO₃⁻.
What is the interaction between salt and water?When salt is added to water, the salt dissolves because the ionic bonds in the salt molecules are weaker than the covalent bonds of water. The salt dissolves in water at the molecular level due to electrical charges. Due to the fact that both salt and water are polar.
The bonds in salt are ionic bonds and to dissolve the salt, the positively-charged side of the water is attracted to the negatively-charged ions of salt and the negatively-charged side of the water is attracted to the positively-charged ions of salt.
The dissociation of the potassium carbonate in water:
K₂CO₃ (aq) → 2K⁺ (aq) + CO₃²⁻ (aq)
H₂O (l) → H⁺ (aq) + OH⁻ (aq)
Carbonate ions are combined with hydrogen ions from water:
CO₃²⁻ (aq) + H⁺ (aq) ⇆ HCO₃⁻ (aq)
Therefore, K⁺, CO₃²⁻ , and HCO₃⁻ ions are present when K₂CO₃ dissolved in water.
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Plants respond to different kinds of stimuli. A plant's roots searching for water are an
example of what kind of response?
A. thigmotropism
B. phototropism
C. hydrotropism
D. gravitropism
Answers
Answer:
Explanation:
Hydrotropism
What's the name of the part of cells that sense molecules and other cells?
Answers
A 32.14 gram sample of a hydrate of MnSO4 was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, 17.51 grams of the dehydrated compound remained. What is the formula of the hydrate?
Answers
Answer:
MnSO₄.7H₂O
Explanation:
To solve this question, we need to convert the mass of the dehydrated MnSO₄. The difference between mass of the hydrate and dehydrated compound is the mass of water. With the mass we can find the moles of water and the formula of the hydrate:
Moles MnSO₄ -Molar mass: 151g/mol-:
17.51g * (1mol / 151g) = 0.116 moles
Moles H₂O -Molar mass: 18g/mol-:
32.14g-17.51g = 14.63g * (1mol / 18g) = 0.813 moles
The ratio of moles MnSO₄: Moles H₂O represent the amount of water molecules in the hydrate:
0.813mol / 0.116mol = 7 molecules of water.
The hydrate formula is:
MnSO₄.7H₂Ohelp me with both number 8 and 9, I actually pressed commensalism for both of them, please be sure of your answer, first one to answer gets brainliest!
Answers
Answer:
8 is mutualism and 9 is commensalism
Explanation:
(e)
Calculate the mass of one atom of sodium.
Use the equation:
relative atomic mass
mass of one atom of sodium =
Avogadro constant
Avogadro constant = 6.02 x 1023
Give your answer to 2 significant figures
Answers
Answer:
3.82 × 10 ^-23 g
Explanation:
6.02 x 10^23atoms = 1 mole of sodium
1 atom = 1/(6.02 x 10^23) mole
mass = mole × molar mass
= 1/(6.02 x 10^23) × 23
= 3.82 × 10 ^-23 g
6. In photosynthesis, plants use carbon dioxide and water to
produce oxygen and glucose. How many grams of water are
needed to produce 75 grams of glucose?
6 CO2 + 6 H2O → C6H12O6 + 6 O2
a. 45grams
b. 90grams
c. 108 grams
d. 180grams
Answers
Al(s) +
Fe2O3(s)
Fe(s) + A1,0.3)
PER nuctives
Answers
A
l
+
F
e
2
O
3
→
A
l
2
O
3
+
2
F
e
Explanation:
One must first balance the metals before balancing non-metals such as Oxygen and Hydrogen (Hydrogen isn't involved in this case).
So therefore on the right hand side you see 2 Aluminium atoms and thus one must add a 2 before the Aluminium on the left hand side.
Secondly the Iron must be balanced, on the left it can be seen that there are 2 Iron atoms in
F
e
2
O
3
and thus a 2 must be added on the right hand side in order for them to balance.
Lastly the Oxygens must be balanced but in this case they already are at 3 on each side and thus the whole equation is now balanced.
Hope I helped :)
What ion does sodium (Na) form
Answers
Explained briefly
In a reaction vessel of 10.0 I, heat 9.00 g of water so that it partially decomposes. In the equilibrium mixture, 0.250 mol of water vapor is then still present. (a) Calculate the equilibrium constant K under the given conditions. (b) How is the equilibrium of the reaction affected by i. 1° reduction in volume ii. 2° increase in temperature?
Answers
Answer:
help
Explanation:
How much carbon will turn into carbon 14 every year?
Science
Please help asap
PLEASE HELP ASAP I'LL MARK BRAINLIEST
Thank you :)
8. A meteor moving 468 km per minute traveling in a south-to-north direction passed near Earth in 2013.
Does this statement describe the meteor’s speed or velocity? 1pt
9. Why did you choose the answer above (explain why)? 1pt
Answers
Answer:
Its velocity was 7.8 km/s northward.
Explanation:
Because the meteor was only 45 m wide and was 27,700 km above Earth's surface it was not visible with the aid of a telescope.
Gold(III) forms an ionic compound with fluoride. How many atoms of each ion will bond to form an ionic compound?
Question 23 options:
1 gold(III), 1 fluoride
1 gold(III), 3 fluoride
2 gold(III), 3 fluoride
3 gold(III), 1 fluoride
Answers
This is because of the good has a 3+ charge and the fluorine has a 1- charge so they have to balance each other out
Answer:
1 gold(III), 3 fluoride
Explanation:
No one is helping me
Answers
Answer:
displacement =1025km
time=6hours
Explanation:
velocity=displacement /time=1025/6=170.8km/h
Explain lab safety rules and procedures when in the science lab. Telpas PLEASEEEE
Answers
Answer:
globe globe
Explanation:
Always wear goggles. Chemical splash goggles should be worn any time you are working with open flame, chemicals, or glassware
Wear appropriate clothing. Baggy clothes and long sleeves can be dangerous when working with chemicals, glassware, or an open flame. Some labs may require a lab coat.
Tie back long, loose hair. Long hair can get into chemicals or into an open flame.
Never taste anything in the lab unless told to do so. Do not taste to identify unless told by teacher. Even if you know it is water in a beaker, the beaker is dirty
Do not apply makeup in class. Chemicals can get into makeup
Distracted from lab. Do not eat or drink in lab
Chemicals can get into food. Spilling may ruin lab.
Wash your hands after lab is complete. Wash with soap and water even if you have gloves on. Use sinks in classroom.
Do not smell chemicals directly. Place chemical in container, hold it at arms length and wave hand over liquid to fan the fumes toward you.
Never remove lab materials from classroom.
Follow all lab procedures. Don't skip any steps and don't add extra steps. If you are unsure ask the teacher.
Never do extra experiments when finished with lab. Only do the lab that is assigned.
Always work in group. Never work alone. Must work in group whether you are friends or not. Do not go ahead of your group.
Stay at lab station. no wandering around room to visit other groups.
Know how to use lab equipment and use properly. lab equipment is not a toy. equipment is expensive and hard to replace.
keep equipment away from edges of counter top too close to the edge and it may fall and break.
No adult and you cannot be in the room. Wait patiently in the hall
No horseplay or pranks in the lab. may lead to serious injury.
clean up spills immediately, even water can be dangerous. depending on the substance you or the teacher will clean it up.
keep lab area clean. cluttered tables and aisles may lead to injury or broken equipment.
Report unsafe conditions or accidents to teacher immediately
do not try to fix broken equipment or give first aide on your own.
Know where all lab safety equipment is located.
eye wash station
shower
first aid equipment
Know how to work all of these
30 N
60 N
20 N
Net force:
Resulting force:
Answers
Answer:
Net force: 110 N
Resulting Force: 24.7289837 pounds-force
Explanation:
First you would add 30+60+20N which would be 110N
110N would equal to the 24.72898937 pounds of force.
I need help answers these questions, I don’t know what the question is asking.
Answers
Answer:
just look at the subscripts, the tiny numbers. in C4H4O4 , there are 4 C molecules, 4 H, and 4 O
Explanation:
hope this helps. good luck
Help ASAP I will mark brainliest for the correct answer !!!⚡️⚡️⚡️
Answers
Answer:
A) 0.5h
Explanation:
Using the formula,
speed=[tex]\frac{distance}{time}[/tex]
Substituting given values
1224=612/time
time=0.5h
The picture shows a diver constructing artificial reef in a shallow area of the ocean. artificial reef is intended to affect the ocean ecosystem by-
A. removing pollution from the water
B. Providing shelter for marine organisms
C. Causing sediment to erode into deeper waters
D. Preventing people from overfishing along the shore
Answers
Answer:
Everyone, the answer is actually B. Providing shelter for marine organisms
Explanation:
We just went over this question in class, this is the right answer. Causing sediment to erode in the waters just doesn't make any sense.
The materials which are used to construct artificial reefs includes rocks, wood, old tires, etc. The artificial reef affect the ocean ecosystem by providing shelter for marine organisms. The correct option is B.
What is an artificial reef?An artificial reef is defined as the manmade structure which may mimic some of the characteristics of the natural reef. The submerged shipwrecks are the most common form of artificial reef. The oil and gas platforms, bridges, etc. and other offshore structures are also function as artificial reefs.
From tourism to marine recreation and also for sport fishing, the reefs play an important role in local economies. They are also important for the health of the ocean and provides habitat for the variety of marine life and support the ocean ecosystems.
The artificial reefs are generally constructed to protect and enhance or restore the components of the marine ecosystems.
Thus the correct option is B.
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A car starts from rest. It takes 6.0 seconds for the car to accelerate to 5 m/s2 W. What is the final velocity?
Answers
Answer: 30 m/s
Explanation:
Use the first kinematic equation for linear motion
[tex]V=V_i+at\\V=0+(5)(6)\\v=30m/s[/tex]
!! brainliest answer !! please help it's due tonight :)
Answers
Answer:
3. D
28. also known as Freon 12
Explanation:
Most halogens form compounds by
(1 Point)
gaining an electron to form a negative ion.
losing an electron to form a positive ion.
losing protons.
joining with both calcium and carbon.
Answers
1. Why do scientists study fossils? *
(25 Points)
O a to learn how the planet was formed
O b. to study how organisms changed over time
O c. to observe how drought affected the landscape
O d. to understand how weathering affect rock layers
Answers
pls pls pls help me, this is a test and I have no clue what do to. pls pls I need answers fast!
Answers
Answer:
12. B
13. D
14. D
15. A
Explanation:
There is 321 grams of H2SO4, how many molecules is this?
Answers
Answer:
The original number of oxygen atoms was about 80 times larger than Avogadro's number. Since each sulfuric acid molecule contains 4 oxygen atoms, there are about 20 moles of sulfuric acid molecules.
Solution A has a pH of 3, and solution B has a pH of 5. Which statement best
describes these solutions?
A. Solution B is more acidic than solution A
B. Solution A is acidic, and solution B is basic.
C. Solution B is less acidic than solution A.
O D. Solution A is basic, and solution B is acidic.
Answers
Answer:
The answer will be C
Explanation:
Solution A has a pH of 3, and solution B has a pH of 5 "Solution B is less acidic than solution A".
What is pH ?The chemical circumstances of such a solution are reflected by pH, which is an essential quantity. The pH might influence nutritional availability, biological functioning, microbial activity, as well as chemical behavior.
What is acidic?Acidic substances were characterized by a sour flavor. An acid is a molecule that can give an H+ ion while remaining energetically stable.
It is known that if pH ≥7 then solution will be acidic
Hence, solution B is less acidic than solution A.
Therefore, the correct answer will be option (C).
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When a comet enters the solar system, it curves toward the sun. Which statement describes why the sun does not move when a comet is nearby?
Answers
Answer:
Explanation:
When a comet enters the solar system it curves towards the Sun due to the Sun's gravitational pull. Every celestial object in the universe has a gravitational pull whose force is dependent on the object's mass. The larger the object is the more gravitational pull it will have. The Sun is the largest object in our Solar system and therefore has the most gravitational pull. This is why the comet curves toward the Sun, but the opposite does not happen because the comet's gravitational pull is not strong enough to pull the Sun.
2. in Journey to the Center of the Earth, by Jules Verne, an adventurer travels through the
layers of Earth until he reaches the center. While it is not possible actually to travel through
all of the layers of Earth, in what order would the adventurer have traveled to reach the
center? Rearrange the layers into the correct order Place the outer layer at the top and the
innernost layer at the bottom
1 Crust
3 Outercore
2 Mantie
4 Inner Core
Answers
Solubility is the-
1.ability of a solute to dissolve in a solvent
2.ability of substances to allow electrons to flow
3.ability of particles to disperse evenly into another substance
4.inability of particles to disperse evenly into another substance
Which one of these?
Answers
Solubility is the ability of a solid, liquid, or gaseous chemical to dissolve in solvent (usually a liquid) and form a solution.
So therefore your answer is 1.
describe the behavior of the molecules in a liquid. Explain this behavior in terms of intermolecular forces.
Answers
The term “INTERmolecular forces” is used to describe the forces of attraction between atoms, molecules, and ions when they are placed close to each other.
In liquids, particles are quite close together and move with random motion throughout the container. Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles.
In a liquid, intermolecular attractive forces hold the molecules in contact, although they still have sufficient KE to move past each other. Intermolecular attractive forces, collectively referred to as van der Waals forces, are responsible for the behaviour of liquids and solids and are electrostatic in nature.
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What mass of sodium hydroxide would be required to make 1.0L of a 0.75M solution of sodium hydroxide,
NaOH?
Answers
Given values are:
Volume, V = 1.0 L or, 1000 mLSolution, M = 0.75 MAs we know the relation,
→ [tex]M = \frac{W}{GM}\times \frac{1000}{V}[/tex]
or,
→ [tex]W = \frac{M\times GM\times V}{1000}[/tex]
By substituting the values, we get
[tex]= \frac{0.75\times 40\times 1000}{1000}[/tex]
[tex]= 30 \ g[/tex]
Thus the above response is right.
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