Answer:
production of antibodies
Answer:
C
Explanation:
The body will start to make antibodies to rid of the "invasion".
So the answer is C
Coffee has a pH of about 5. Therefore, coffee is -
Question 6 options:
neutral
extremely acidic
somewhat acidic
basic
Answer:
The answer to your question is Basic
Explanation:
pH ranges from 0 to 14, with 7 being neutral. pHs less than 7 are acidic while pHs greater than 7 are alkaline (basic).
I hope this helps!
How does the law of conservation of mass apply to this reaction:Mg + 2HCl → H2 + MgCl2?
Answer:
The law of conservation of mass has already been applied. There is an equal number of each element on both sides of the equation.
Explanation:
Have a Blessed Day
I hope I helped
Name the following ionic compounds that contain transition metals. Use the periodic table provided
and a chart that lists the possible charges of transition metals, found here.
Cuci
copper(1) chloride
O
copper chloride
copper(ll) chloride
DONE
The correct name of the compound CuCl is copper I chloride.
An ionic compound is formed two atoms when one loose electrons and the other atoms gains those electrons. Ionic bonds are actually an ion pair, a pair of oppositely charged ions held together by electrostatic interaction. Transition metals are elements with incompletely filled d orbitals. Copper is a transition element.
The compound CuCl is named copper I chloride. We can see that the copper is in the +1 oxidation state in this compound hence the name.
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Answer:
copper(I) chloride
Explanation:
Edge 2021
How much heat is needed to raise the temperature of 100g of an iron from 25°C to
110°C?
(The specific heat of iron is 0.45 J/g∙°C).
Answer:
382.5J
Explanation:
Use the formula:
E = mcΔθ or Q = mcΔT
m = 100g
c = 0.45 J/g°C
ΔT or Δθ = 110 - 25 = 85°
Sub in the values:
E = 100 × 0.45 × 85
= 382.5J
A fictitious element X is composed of 10.0 percent of the isotope 55 X, 20.0 percent of the
isotope 56 X, and 70.0 percent of the isotope 57 X. Estimate the atomic mass of element X.
Answer:
56.6 g/mol.
Explanation:
Assuming here that we have 100 atoms of each element. The percentage tells us that we have 10 atoms of the 55 isotope, 20 of the 56, and 70 of the 57.
So the total is 10*55 + 20*56 + 70*57 = 5,660. And to get the average, we just divide by the total number of atoms (100).
Atomic mass = 5660/100 = 56.6
I have nothing to say hear look at picture sorry
Answer:
D
Explanation:
Hope it helps :p
which molecule is oxidized in the photosynthetic reaction?
Answer:
Water
Explanation:
Water is oxidized in photosynthesis, which means it loses electrons, and carbon dioxide is reduced, meaning it gains electrons
who can write an essay
Answer:
anyone you just have to know how
Explanation:
A sample of aluminium has a mass of 54 gram. What is the mass of the same number of magnesium atom.
Answer:
48g of Magnesium.
Explanation:
We know that:
Mole=given mass/molar mass
Then, moles of aluminum = 54/27 = 2.
A/c to question ,
For 2 moles of magnesium it's mass is 2×24=48g.
Hence, the required mass for same number of magnesium atoms is 48g.
(Hope this helps can I pls have brainlist (crown)☺️)
under what circumstances can an atom emit a photon
Answer:
Here
Explanation:
When the atom absorbs energy, it can move to a higher energy state, or excited state. Under what circumstances can an atom emit a photon? A photon is emitted when an atom moves from an excited state to its ground state or to a lower-energy excited state.
(WORD BANK - Neap, gravitational, greatest, moon, high, Spring, low, Sun)
Ocean tides are caused by the ______________ pull of the _______ and the _______. The moon has the __________ effect on the tides. When the Sun, moon and earth are in a straight line, we
have __________ tides. When the Sun, moon and earth are at right angles we have _________
tides. Spring tides are especially _________ tides while neap tides are especially _________tides.
Answer:
Ocean tides are caused by the gravitational pull of the moon and the sun. The moon has the greatest effect on the tides. When the Sun, moon, and earth are in a straight line, we have Neap tides. When the Sun, moon, and earth are at right angles we have spring tides. Spring tides are especially high tides while neap tides are especially low tides.
Explanation:
brainliest please. . . <3
what is the main precaution to take if a gas cylinder sign is present in the lab?
Answer:
This symbol indicates that hazardous products with this pictogram are gases that are contained in a receptacle under pressure, or which are liquefied or liquefied and refrigerated. The hazards presented by these products are related to the high pressure or cold temperatures.
Hazardous products with this pictogram can be safely worked with if proper storage and handling practices are followed.
Credited to https://www.ccohs.ca/oshanswers/chemicals/howto/gas_cylinder.html#:~:text=The%20symbol%20within%20the%20pictogram%20is%20a%20gas,related%20to%20the%20high%20pressure%20or%20cold%20temperatures.
HAve a great day!
The main precaution to take if a gas cylinder sign is present in the lab is Check sure the gas cylinder remains constrained visually, but remain a good distance from it.
What is gas cylinder?A gas cylinder is indeed a pressure vessel used to store and confine gases at pressures higher than atmospheric pressure. Bottles are another name for high-pressure gas cylinders.
Based on the physical properties of the contents, the held contents may be compressed gas, vapour over liquid, working fluid, as well as dissolved in a substratum inside the cylinder. The main precaution to take if a gas cylinder sign is present in the lab is Check sure the gas cylinder remains constrained visually, but remain a good distance from it.
Therefore, the precaution is to Check sure the gas cylinder remains constrained visually, but remain a good distance from it.
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Elements in which the d-sublevel is being filled have the properties of
Answer:
Elements in which the d-sublevel is being filled have the properties of metals
Elements in which the d-sublevel is being filled have the properties of;
transition metals.
In quantum theory the sublevel is an energy level. Now, the d-sublevel in atomic configuration has 5 orbitals and as such can contain a maximum of 10 electrons.
Now, this d-sublevel is used primarily by elements called "transition elements" as they are also called d-block elements.
However, these transition elements are also called transition metals because all the transition elements possess properties of metals generally.
In conclusion, elements in which the d-sublevel is being filled have the properties of transition metals.
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plz help fast. Which of the following represents a chemical change? (2 points)
1. decomposition of stone due to acid rain
2. iron's attraction to a magnet
3. the pink color of a rose
4. rocks being smoothed by rapid water movement
Answer:
1. Decomposition of stone due to acid rain.
3. The pink color of a rose.
Explanation:
Chemical changes always end up with new products in an equation, or it has always something to do with chemicals. Physical changes on the other hand, do not result in new products and it just changes the physical properties and physical state of matter of the object.
In terms of attractive forces, explain why LiClhas a higher melting point than SCI2.
Answer:
Well, SCl2 is known, so is disulfur dichloride… Cl−S−S−Cl …and BOTH these species are molecular… On the other hand, lithium chloride, an ionic salt, is decidedly non-molecular, and consists of an infinite array of lithium and chloride ions held together by strong electrostatic forces ….. and thus we would expect the salt to have the much higher melting point….
What is it about water that makes it able to dissolve both polar covalent and iconic substances
Answer:
A solvent is simply a substance that can dissolve other molecules and compounds, which are known as solutes. ... Because of its polarity and ability to form hydrogen bonds, water makes an excellent solvent, meaning that it can dissolve many different kinds of molecules.
Explanation:
why are some substances such as magnesium and fluoride allowed in drinking water?
Answer:Pure water does not contain fluoride, but much drinking water does contain fluoride that is deliberately added to reduce tooth decay of children who drink the water. Some drinking water supplies also contain fluoride naturally.
Explanation:
in small doses not harmful
Fluoride is a chemical that is intentionally added to drinking water in order to prevent tooth decay in children. Pure water does not naturally contain fluoride. Some sources of drinking water naturally contain fluoride as well.
Why magnesium and fluoride allowed in drinking water?Fluoride is a chemical that is intentionally added to drinking water in order to prevent tooth decay in children. Pure water does not naturally contain fluoride. Some sources of drinking water naturally contain fluoride as well.
Compared to magnesium found in food, magnesium in water is present as hydrated ions, which are more easily absorbed. Thus, the role played by water magnesium in the prevention of magnesium insufficiency may be quite important for people who drink water with high magnesium levels.
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Answer the following:
What are 3 types of physical properties for nitrogen?
What are 2 types of chemical properties for nitrogen?
Answer:
What are 3 physical properties of nitrogen?
Elemental nitrogen is a colorless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.09 percent of Earth's atmosphere by volume.
What are 2 chemical properties of nitrogen?
Elemental nitrogen is a colorless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.09 percent of Earth's atmosphere by volume. Nitrogen gas is an industrial gas produced by the fractional distillation of liquid air or by mechanical means using gaseous air.
6. Haydee prepared a solution with 3mL of potassium chloride (KCl) in 200 mL of water is prepared. Calculate the percent by volume concentration of the solution.
A. 1.46% B.1.48 %
C. 1.49 % D. 1.50%
Considering the definition of percent by volume concentration, the correct answer is option D: the percent by volume concentration of the solution is 1.50%
Percent by volume concentration is a measure of concentration that indicates the volume of solute per 100 volume units of the solution. This value is calculated by dividing the volume of the solute by the total volume of the solution, and multiplying by 100 to express it as a percentage:
[tex]percent by volume concentration=\frac{volume of solute}{total volume of the solution}x100[/tex]
In this case, you know:
volume of solute= 3 mLtotal volume of the solution= 200 mLReplacing in the definition of percent by volume concentration:
[tex]percent by volume concentration=\frac{3 mL}{200 mL}x100[/tex]
Solving:
percent by volume concentration=0.015×100
percent by volume concentration=1.50
Finally, the correct answer is option D: the percent by volume concentration of the solution is 1.50%
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https://brainly.com/question/1713808What volume will 75 g of O2 occupy at STP?
p = latm
t = 273.15K
R= 0.08206 L atm mol K
75.0g02
16.00 (O₂) = 4.6875mol mol
9
Ideal gas law: PV = nRT, solve for volume: V = nRT P
V =
4.6875mol 0.08206 L-atm mol. K · 273.15K
V = 105L
latm
help pls now now now
5- perfume sprayed in the air
6- I'm really sorry but I'm not sure
How do you know where something fits on the electromagnetic spectrum? I currently have the Hz but do I need to convert that into something else?
Answer:
can oxygen exist as a liquid and solid
Which of the following are properties of compounds formed by covalent bonding (Select all that apply)
1. When you dissolve an covalent compound in water, the solution does not conduct electricity.
2. Covalent compounds often have lower melting points than ionic compounds.
3. When you dissolve an covalent compound in water, the solution conducts electricity.
4. Covalent compounds form when combining two or more nonmetal atoms.
5. Covalent compounds form when combining a two metal atoms.
6. Covalent compounds form when combining a metal atom with a nonmetal atom.
Answer:1, 2, and 4
Explanation:
covalent bonds are not ionic. the elements SHARE electrons
Which of the following are properties of compounds formed by covalent bonding (Select all that apply)
1. When you dissolve an covalent compound in water, the solution does not conduct electricity.
2. Covalent compounds often have lower melting points than ionic compounds.
3. When you dissolve an covalent compound in water, the solution conducts electricity.
4. Covalent compounds form when combining two or more nonmetal atoms.
5. Covalent compounds form when combining a two metal atoms.
6. Covalent compounds form when combining a metal atom with a nonmetal atom.
The properties of covalent compounds are option 2, 3 and 4. Covalent bonds are weaker than ionic bonds.
What are covalent bonds?Covalent bonds are formed by sharing electrons between two atoms. Non metals with comparable electronegativities forms covalent bonds. They are weaker than ionic bond. Thus have lower melting point.
Melting point depends on the bond strength that's why covalent compounds have lower melting point compared with ionic bonds.
Polar covalent bonds can conduct electricity when dissolved in water because of the presence of free electrons. Thus option 3 is correct.
Hence, the properties in option 2, 3 and 4 are correct for covalent compounds.
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2NaClO3 ——> 2NaCl + 3O2
1) if you produced 114.25g NaCl, how many grams of NaClO3 did you decompose?
2) Using the same reaction in the first exercise; how many particles of NaClO3 are needed to
produce 68.30L of oxygen?
Answer:
1) 208.09 g2) 7.11 × 10²² particlesExplanation:NUMBER ONEFind moles of Known Substance (NaCl)
Moles of NaCl = mass ÷ molar mass
= 114.25 g ÷ 58.44 g/mol
= 1.955 mol
Use Mole Ratio of Known to Unknown (NaCl : NaClO₃) to Determine Moles of Unknown
The mole ratio of NaCl to NaClO₃ is 2 to 2 or simply 1 to 1.
This means that for each mole of NaCl produced the same number of moles of NaClO₃ was decomposed.
∴ since moles of NaCl = 1.955 mol,
then moles of NaClO₃ = 1.955 mol
Find Mass of Unknown
Mass of NaClO₃ = moles × molar mass
= 1.955 mol × 106.44 g/mol
= 208.09 g
NUMBER TWODetermine the Moles of Known (O₂)
moles of O₂ = (volume × density) ÷ molar mass
= (68.30 L × 0.0828 g/L) ÷ 32 g/mol
= 0.177 mol
Use Mole Ratio of Known to Unknown (O₂ : NaClO₃) to Determine Moles of Unknown
Mole ratio of O₂ : NaClO₃ is 3 : 2. Therefore for each mole of oxygen produced, ²/₃ the moles of NaClO₃ is produced.
∴ if moles of O₂ = 0.177 mol
then moles of NaClO₃ = 0.177 mol × ²/₃
= 0.118 mol
Find the Number of Particles of Unknown
Number of particles = moles × Avogadro's Number
= 0.118 mol × (6.022 × 10²³ particles/mol)
= 7.11 × 10²² particles
Someone pls help me I will make you brain
Answer:
i think it's freezing of permafrost. so sorry if it's wrong lol
is a paper clip homogeneous or heterogenous? substance or mixture? solution, colloid, suspension?
Explanation: It is an alloy, very probable, not homogeneous.
A metal paper clip is usually steel, an alloy of iron, carbon, and other elements in various amounts. A plastic paper clip is composed of a polymer, a very complex compound.
A paper clip is a Colloid
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how did dalton advance the atomic philosophy proposed by democritus
Answer:
(Hope this helps can I pls have brainlist (crown)☺️)
Explanation:
Dalton turned Democritus' views on atoms into a scientific theory by employing experimental methods. Atoms can join or detach during chemical processes, but they never transform into a different atom.
Dalton was an excellent polymath, a natural philosopher, and a real scientist. His thorough investigations prompted him to suggest an early atomic theory for which exceptions would be difficult to uncover today:
Dalton offered the following:
Atoms are microscopic particles that make up elements. Atoms of the same element have the same size and mass; however, atoms of other elements have varying sizes and masses when compared to atoms of other elements. Subdivision, creation, and destruction of atoms are all impossible.
All of these ideas were developed after a great deal of testing. Other researchers may replicate his work, and new findings could be included into this atomic idea.
Democritus, on the other hand, was a 5th-century BC Greek philosopher. He conducted no experimental work as far as we know, and none of his publications have survived. He postulated that matter was made up of a single indivisible element known as an atom; the word atom originates from the Greek word oos, which meaning "uncuttable" or "indivisible." So the name atom might be a homage to Democritus.
2 hydrogen atoms; 3 helium atoms; 5 oxygen atoms; 6 iron atoms
19 aluminum atoms; 15 phosphorus atoms; 7 sodium atoms
B. What do the following spellings indicate:
4Cl; 12 thousand; 17Zn; 2 grams; Three; 8C; 15Al
Answer:
4chlorine;12thousand ;17zinc;2grams;three 8carbon;15aluminium
During the process of peer review, a scientific study must have:
Group of answer choices (( its not precision//validity ))
repetition
precision
accuracy
validity
Answer:
Accuracy
I guess
Cause then it makes sense
Hope this helps
How many molecules are there in .230kg of CoCl2?
I have been trying to answer this question but everytime I get the answer it goes to 4.96e-19 or lower. I don't understand what I am doing wrong or what the right way to set up the question.
Answer:
CoCI2 molecular weight is 129.84 g/mole
230 CoCI2 divided by the molecular weight
230 g/ 129.84 g/mole = 1.77 moles of CoCI2
