Answers
Related Questions
6. All changes in states of matter (freezing, evaporation, condensation, etc.) are
a. physical changes
b. chemical changes
Answers
Pretty sure its Physical Changes
No chemical reaction is happening.
Answer:
Changes of states are physical changes
Explanation:
They are reversible changes that do not involve changes in matter's chemical makeup or chemical properties.
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If a substance has a PH of 7 is it a acid, base or a neutral.
Answers
Answer:
Neutral
Explanation:
A pH below 7 is acidic and a pH above 7 is basic, and a pH of 7 is neutral.
Explanation: A substance that is neither acidic nor basic is neutral. The pH scale measures how acidic or basic a substance is. The pH scale ranges from 0 to 14. A pH of 7 is neutral
what kind of bonds involve a transfer of electrons? what kind of bond involves sharing of electrons?
Answers
Answer:
While covalent bonding involves sharing electrons between two atoms, ionic bonding involves the complete transfer of electrons from one atom to another, creating positive and negative ions. These ions are then held together by the attraction between their opposite charges.
Explanation:
Hope this helped!
3.) All matter has both physical and chemical properties. A physical property is one that does not change the chemical nature of matter. Which of these choices is a physical property?
A.) height
B.) flammability
C.) ability to rust
D.) reaction with water
Answers
Answer:
D
Explanation:
It would be D because you are observing the reaction and don’t change anything
With over 6 billion people living on Earth, it is common for two people to have the same DNA.
True
ОR
False
Answers
someone help me please i’ll give brainly
Answers
Answer:
D) All of the above
Explanation:
When the temperature of an object increases, the average kinetic energy and speed of its particles increases. When the average kinetic energy of its particles increases, the object's thermal energy increases. Therefore, the thermal energy of an object also increases as its temperature increases.
(Need Help ASAP) 23.5 grams of iron(III) oxide (Fe2O3) are reacted with excess carbon. What is the theoretical yield of iron metal?
2 Fe2O3 + 3 C --> 4 Fe + 3 CO2
Answers
The theoretical yield of iron metal : 16.418 g
Further explanationA reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction
2 Fe₂O₃ + 3 C ⇒ 4 Fe + 3 CO₂
mol Fe₂O₃ (MW=159,69 g/mol) :
[tex]\tt \dfrac{23.5}{159.69}=0.147[/tex]
mol Fe₂O₃ : mol Fe = 2 : 4
mol Fe :
[tex]\tt \dfrac{4}{2}\times 0.147=0.294[/tex]
mass Fe(the theoretical yield) :
[tex]\tt 0.294\times 55.845~g/mol=16.418~g[/tex]
Answer:
The correct answer with signfigs is 16.4 for the first part
The second box is 88.4
Explanation:
Which chemical equation is balanced?
A. CaO2 + HCl → CaCl2 + H20
B. CO2 + H2O + H2CO2
C. K+ H2O → K20 + H2
D. MgO + 2HCI – MgCl2 + H20
10 points if you answer fast
Answers
D. MgO + 2HCI – MgCl2 + H20
Further explanationThe chemical equation is said to be balanced if the number of atoms in the reactants is equal to the number of atoms in the product
A. CaO2 + HCl → CaCl2 + H20
atoms O, Cl and H are not the same
B. CO2 + H2O + H2CO2
atoms O are not the same
C. K+ H2O → K20 + H2
atoms K are not the same
D. MgO + 2HCI – MgCl2 + H20
Mg, left = 1, right=1
O, left=1, right=1
H, left=2, right=2
Cl, left=2, right=2
Chemical equation is balanced
Answer:
B. CO2 + H2O + H2CO2
Explanation:
Can someone help? Ill give brainliest!
Directions: count each side of the reaction. Circle yes or no if it follows the law of conservation of mass
Answers
Answer:
Yes, it becomes 2 of H20 which is water
when is the energy source used to fuel photosynthesis
Answers
Answer:
Photosynthesis, process by which green plants and certain other organisms use the energy of light to convert carbon dioxide and water into the simple sugar glucose. In so doing, photosynthesis provides the basic energy source for virtually all organisms.
Explanation:
Air is trapped in a cylinder fitted with a piston that occupies 150.5 mL at 1.12 atm pressure. What is the new volume when the piston is depressed, increasing the pressure by 15%?
Answers
Answer:
New volume V2 = 120.4 ml
Explanation:
Given:
Pressure P1 = 1.12 atm
New pressure P2 = 1.12[1+0.25] = 1.4 atm
Old volume V1 = 150.5 ml
Find:
New volume V2
Computation:
P1V1 = P2V2
(1.12)(150.5) = (1.4)(V2)
V2 = 120.4 ml
New volume V2 = 120.4 ml
Which is more electrically negative? 1)C 2)P or 3)S
GUYS PLEASE HELP!!! :((
Answers
Answer:
3 sulphur is more electrically –
Sounds with small amount of energy______distances than sounds with more energy
A.Shorter
B. Longer
C.same
D. Medium
Answers
How did the substance oxygen change the world??
Answers
Answer: The atmosphere of Earth wasn't always full of oxygen. ... An accidental mutation would some day change the world forever as these organisms would become able to feed off of the sunlight around them, and produce oxygen in a process known as photosynthesis. This oxygen, which none of these organisms could use, was toxic.
How many moles are there in a 122 gram sample of nickel (Ni)?
7.16 x 103 moles
6.22 mol
2.08 mol
0.481 mol
Answers
The atomic mass of nickel is 58.71 gm and the given mass of nickel is 122 gm. Therefore, 2.08 moles are present in a 122-gram sample of nickel.
Nickel:
The atomic number of nickel is 28.The symbol of nickel is Ni.Density of a nickel 8.908 g/cm3.It is a d block element.It belongs to group 10 and period 4.It is also called transition metal.It is a metal and is located between groups 2 and 3.Mass of nickel given: 122 grams.
Atomic mass of nickel: 58.71 g mol
Number of moles = Mass / molar mass
= 122/ 58.71
= 2.078
= 2.08 moles.
The atomic mass of nickel is 58.71 gm and the given mass of nickel is 122 gm. Therefore, 2.08 moles are present in a 122-gram sample of nickel.
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This is due tomorrow so please help! : name a product where viscosity is important its creation or use explain why it is important
Answers
A very hot cube of copper metal (32.5 g) is submerged into 105.3 g of water at 15.4 0C and it reach a thermal equilibrium of 17.3 0 Calculate the initial temperature of copper (Cs = 0.385 J/g 0C for copper, and 4.18 J/g 0C for water).
Answers
Answer:
The initial temperature of the metal is 84.149 °C.
Explanation:
The heat lost by the metal will be equivalent to the heat gain by the water.
- (msΔT)metal = (msΔT)water
-32.5 grams × 0.365 J/g°C × ΔT = 105.3 grams × 4.18 J/g °C × (17.3 -15.4)°C
-ΔT = 836.29/12.51 °C
-ΔT = 66.89 °C
-(T final - T initial) = 66.89 °C
T initial = 66.89 °C + T final
T initial = 66.89 °C + 17.3 °C
T initial = 84.149 °C.
Help please its science
Answers
Answer: any answer choices
Explanation:
The chemical equation below shows the amount of the reactants used and the amount of only one of the products formed. How much water (H2O) should be formed in this chemical reaction? CH4 mass 4 + 2O2 mass 16 CO2 11 + 2h2O mass ?
Answers
Answer:
CH4 + 2O2 → CO2 + 2H2O
Explanation:
This is all i could come up with im sorry.
The amount of water formed in the given chemical reaction is 9 grams.
What is Stoichiometry?Stoichiometry is the calculation for the determination of the relative amount of reactants and products in chemical reactions. Stoichiometry is based on the law of conservation of mass where the total mass of the reactants in reaction equals the total mass of the products.
If the quantity of one reactant is known and the quantity of the product can be determined empirically, then the quantity of the other reactants can be calculated.
Given chemical equation is:
CH₄ + 2O₂ [tex]\longrightarrow[/tex] CO₂ + 2H₂O
16g 32g 44g 32g (from their molecular masses)
The amount of methane, oxygen, and carbon dioxide is 4g, 16g, and 32 g respectively.
16g of methane react with oxygen = 32g
4g of methane will react with oxygen = 8g
It means here methane is the limiting reagent as the given amount of oxygen is more than reacted one. So CH₄ will decide the amount of water.
16g of methane produces water = 32g
Then 4g of methane will produce water = (32/16) × 4 = 9 g
Therefore, 9 grams of water should be formed in this reaction.
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Which statement applies only to electric force insted of electric and magnetic forces
Answers
Answer:
If the options are
A. It can push objects apart
B. It can pull objects together
C. It acts between charged particles
D. It acts between objects that do not touch
I'm pretty sure it would be C.
Sry if wrong but have nice day! <3
A 23.7 g piece of iron at 54.9°C is cooled and releases 338 J of heat. The specific heat of iron is 0.450 J/g°C.
Answers
Answer:
The heat capacity and the specific heat are related by C=cm or c=C/m. The mass m, specific heat c, change in temperature ΔT, and heat added (or subtracted) Q are related by the equation: Q=mcΔT. Values of specific heat are dependent on the properties and phase of a given substance.
Explanation:
Answer:
23.2 degrees c
Explanation:
Describe in your own words how the earth's layers were formed.
Answers
The layers of the earth were formed due to the sediments that significantly flattens out beside the center of the earth. After a long duration, a new layer is spread over the older layer, and so on.
What are the different layers of the earth?The different layers of the earth are as follows:
The Inner Core: This is the first layer from the center of the earth. The Outer Core: It is found after the inner core. The Mantle: It is the middle layer of the earth. The Crust: It is the outermost layer of the earth.The above-mentioned layers of the earth were formed with the impact of the building blocks of the earth that are remarkably known as Planetesimals, collided, and collapsed.
During that time, the hardest elements like nickel, iron, etc. constitute the core while the lighter elements like carbon, oxygen, silicon, etc. play an essential role in the formation of crust and mantle.
Therefore, the layers of the earth were formed due to the sediments that significantly flattens out beside the center of the earth.
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periodic table of elements
Answers
Vertical Column is a group
Horizontal is Period
Aliki earth metals is a group
Lithium- Neon is both
Based on electrons are both
Number of electron shells is both
How do I graph these question
a. Explain why bicycle tires seem higher in the summer than in winter.
b. Explain why a can of soda pop explodes if left in the hot sun.
c. A rigid container filled with a gas is placed in ice (ex. nalgene bottle). What will happen to the pressure of the gas? What do you think will happen to the volume?
d. An infected tooth forms an abscess* that fills with gas. The abscess puts pressure on the nerve of the tooth, causing a toothache. While waiting to see a dentist, the person with the toothache tried to relieve the pain by treating the infected area with moist heat. Will this treatment help? Why or why not?
Answers
Help plz:))) I’ll mark u brainliest
ASAP!!!
Answers
Answer:
rank from lower to higher electronegativity
16)Li
C
N
17)Ne
C
O
18)Si
P
O
19)K
Mg
P
20)He
S
F
Which of the following is true about waves?
A.
They are always visible.
B.
They always move matter.
C.
They carry energy.
D.
They can only travel though outer space.
Answers
Answer:
c. they carry energy is the answer
Answer:
C. they carry energy
Explanation:
Energy can be carried from one place to another by waves, including water, light, and sound waves. Waves are oscillating disturbances that travel through but do not move matter.
Infrared radiation escaping from hot coals is an example of invisible waves carrying energy. This energy can be felt as heat.
it!
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Calculate How old was the tree when it was
cut down?
Answers
Answer:
No numbers how are we supposed to know
Explanation:
How is the pH of an acidic substance raised?
1) Dilute it.
2) freeze it.
3) Stir it.
4) Concentrate it.
Answers
Answer: 4) Concentrate it
Explanation:
How can air quality be fine on one day and hazardous on the next? What
are some things that can cause a rapid change in air quality? *
Answers
Answer:
Air Current
Explanation:
Say I am in California and there is a massive fire next to me but not close enough to me to really see the fire and the next day I see no fire but theres a ton of ash in the sky, this can be due to the wind current taking the smoke from the fire into my direction and that smoke falling in my area. So basically a wind current can take the smoke from a fire into another destination and cause a rapid change in air quality in a day.
What is a non-example of a nucleus? Please give me a non-living thing.
Answers
Answer:
They are prokaryotes and both have tough cell walls. ◦ The cytoplasm contains ribosomes, but no organelles. ◦ There is no nucleus for organisms in this category.
Explanation:
Answer:
rock- non living
( Prokaryotes don't have a nucleus)
Explanation: