Answer:
A perfect mold of a dinosaur bone
What are polyatomic ions and how are they formed?
Answer:
Polyatomic ions are covalently bonded groups of atoms with a positive or negative charge caused by the formation of an ionic bond with another ion. Compounds formed from such ion combinations are called polyatomic ionic compounds, but the polyatomic ion behaves as a single uni
Explanation:
2. You have 200g or a solution that contains 30g of hydrochloric acid (HCI),
what percentage of your solution is made up of HCI acid?
Answer:
the percentage of your solution that made up of HCI acid is 15%
Explanation:
The computation of the percentage of your solution that made up of HCI acid is given below:
Given that
There is 200g or a solution that have 0 g of hydrochloric acid (HCI)
Based on the above information
The percentage is
= 30g ÷ 200g
= 15%
Hence, the percentage of your solution that made up of HCI acid is 15%
People mine zinc metal for use as an anticorrosive, skin protectant, and in electrical components. Zinc mining involves using chemicals to
remove the zinc from larger rocks. Demand for zinc increased over the past 35 years.
If the management of zinc mines stays the same, how will the increased demand for zinc most likely impact the environment?
O A. Global temperatures will rise because mining releases heat from Earth's Interior.
O B. Biodiversity will increase because mining speeds the release of Important minerals from rocks.
O C. The acidity of the surrounding soil and water will change because of the discharge of mine waste.
O D. Sea level will decrease substantially because the mining process requires substantial amounts of water
Do you think that it is necessary and/or important to take a multivitamin everyday to maintain optimal health? What might help you answer this question? What types of things might influence your decision to take a multivitamin every day?
What's ur opinion with explanation???????!!!!!!!!!!
Which elements have similar chemical properties?
a) Na, K, Mg
b) B, Al, S
c) N, O, F
d) He, Ar, Kr
Answer:
d) He, Ar, Kr
Explanation:
To have similar chemical properties, elements must belong to the same period on the periodic table.
As a generally periodic trend, elements within the same group, have the same chemical properties.
So, the correct answer choice will draft elements from the same group.
He, Ar and Kr belongs to the group of elements called the noble gases. They are an unreactive group of elements. They are found in the last group on the periodic table. These elements do not readily combine with other elements.Answer:
D
Explanation:
1. B How many grams are in 5.00 mol of CO2? CO2 molar mass is 44 g/mol. 1 point Grams = Moles X Molar Mass
Answer: 220 g
Explanation:
To find the answer to this problem, all you need to do is multiply the number of moles by the molar mass of the molecule.
In this problem, you multiply 44 (the molar mass of CO2) by 5 (the grams of CO2 given) to get 220.
Answer:
220 g
Explanation:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles CO2, or 44.0095 grams.
Place the following metals in order of most reactive to least:
Aluminium
Calcium
Copper
Iron
Magnesium
Sodium
Zinc
Answer:
Sodium
Calcium
Magnesium
Aluminium
Zinc
Iron
Copper
Explanation:
what is the full name of the compund CuSO4?
Please can you help me? (✿◡‿◡)
CuSO4 is Copper Sulphate.
How do I know if hand soap is working properly and how are some methods I can test it?
Answer:
Part A) By seeing if your hands are clean and dont have germs
Part B) Dip your hands in mud and then wash your hands to see results
Explanation:
All organisms need glucose or a source of________ to carry out basic life functions
Answer:
chlorophyll
Explanation:
Problems 4-6 convert the measurements into moles.
4. 9.03 x1023 C atoms
5. 2.44x1023 H2O molecules
6. 6.02x1023 Li atoms
Answer:
4. 1.5moles
5. 0.405moles
6. 1 mol
Explanation:
To find the number of moles in each susbtance in this question, we divide each number of atom/molecule measurement by Avagadro's number (6.02 × 10^23 atoms)
That is; nA = n × 6.02 × 10^23 atoms
n = nA ÷ 6.02 × 10^23 atoms
Where;
nA = number of atoms
n = number of moles
4.) n of Carbon = 9.03 x 10^23 ÷ 6.02 × 10^23
n = 1.5 × 10^ (23-23)
n = 1.5 × 10^0
n = 1.5 × 1
n = 1.5moles.
5.) n of H2O = 2.44 x 10^23 ÷ 6.02 × 10^23
n = 0.405 × 10^ (23-23)
n = 0.405 × 10^0
n = 0.405moles
6.) n of lithium = 6.02 x 10^23 Li atoms ÷ 6.02 × 10^23
n = 1 × 10^ (23-23)
n = 1 × 10^0
n = 1 mol
Please help fast! I will give brainliest!
Answer:(c)
Explanation:
i am not sure i am thinking A and C
Answer:
I think so too
Explanation:
ILL GIVE YOU BRAINLIEST <3
1) How many total atoms in the molecule: (NH4)2SO4
a) 15 b) 14 c) 12 d) 10
Answer:
Should be a 15 imo
Explanation:
N is one, 4H = 4, S 2 because of the 2 and O 8 because of the 4 and the 2 before the S.
Select all the correct answers.
Joshua dissolved sugar in water to create a sugar solution. His friend Ray tells him it’s a compound, but Joshua corrects him. Which words actually describe the sugar solution?
gas
liquid
mixture
solid
Answer:
liquid and mixure
Why do atoms bond?
a. Noble Gas Configuration b. Halogen Configuration c. Magnetic Configuration
Answer:
es la letra a)
Explanation:
síganme en insta
How many GRAMS of H2 would you need to produce 2.5 mol NH3?
Question 1 (4 points)
You are given a Stoichiometry word problem with a chemical reaction with reactants and products given below:
2A + B2 --> 2AB
You must find the mass of AB formed with 4 moles of B2.
Q: Which of the following information do you need to have in the correct order to solve the problem?
1. to cancel out moles of B2, you must multiply with a factor that have moles of B2 at the denominator and
moles of AB in the numerator
2. Find mole ratios of B2 and AB to obtain conversion factors
3. to cancel moles of AB, you must multiply with a factor that has 1 mole of AB in the denominator and molar
mass of AB on the numerator.
4. Start solving with the given information (moles of B2) first
5. Balance the equation
Can someone help me with these?
How does the FDA regulate the animals?
Compare cloned animals to genetically engineered animals using recombinant DNA.
What is AquAdvantage Salmon? What is its purpose?
What is an Oxitec mosquito? What is its purpose?
Identify a minimum of three benefits and risks associated with genetically engineered animals.
What type of ethical issues are involved with the genetic engineering of animals?
Check answer here hope it helps
A student in a chemistry laboratory has access to two acid solutions. The first one is 20% acid and the second solution is 45% acid.(The percentages are by volume). How many millilitres of each solution should the student mix together to obtain 100ml of a 30% acid solution?
Volume of each solution : 60 ml 20% and 40 ml 45%
Further explanationGiven
20% and 45% acid
100 ml of 30% acid
Required
Volume of each solution
Solution
Molarity from 2 solutions :
Vm Mm = V₁. M₁ + V₂. M₂
m = mixed solution
V = volume
M = molarity
V₁ = x ml
V₂ = (100 - x) ml
Input the value :
100 . 0.3 = x . 0.2 + (100-x) . 0.45
30 = 0.2x+45-0.45x
0.25x=15
x= 60 ml
V₁ = 60 ml
V₂ = 100 - 60 = 40 ml
For the preparation of the 30% 100 ml acid solution, 40 ml 45% solution has been mixed with 60 ml 20% acid solution.
To prepare the solution with the concentrated solution:
MV = M1V1 + M2V2
The M has been the concentration of the resulted solution, and V has been the volume of the resulting solution.
M1 and M2 and V1 and V2 have been the concentration and volume of the given solution.
0.30 × 100 ml = 0.20 × x + 0.45 × (100 - x)
30 = 0.20x + 45 - 0.45x
0.45x - 0.20x = 45 - 30
0.25x = 15
x = 60 ml
The volume of 20% solution has been x = 60 ml
The volume of 45% solution has been 100 - x = 40 ml.
For the preparation of the 30% 100 ml acid solution, 40ml 45% solution has been mixed with 60ml 20% acid solution.
For more information about the acid preparation, refer to the link:
https://brainly.com/question/1457002
9
A 75 gram sample of water is initially at 30 degrees Celsius. What would it's temperature be if
it absorbed 2000 J of heat?
Answer:
T2 = 36.38°C
Explanation:
Given data:
Mass of water = 75 g
Initial temperature = 30 °C
Final temperature = ?
Heat absorbed = 2000 J
Solution:
Specific heat capacity of water is 4.18 J/g.°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = Final temperature - initial temperature
2000 J = 75 g×4.18 J/g.°C × T2- T1
2000 J = 313.5 J/°C × T2- T1
2000 J = 313.5 J/°C × T2 - 30 °C
2000 J / 313.5 J/°C = T2 - 30 °C
6.38 °C = T2 - 30 °C
T2 = 6.38 °C + 30°C
T2 = 36.38°C
The weight of an object is different on each planet because _____.
1.each planet is a different distance from the sun
2.each planet has a different force of gravity
3.mass of the object changes on each planet
4.mass changes with location
1. OBJECT A HAS A TEMPERATURE OF 78K AND OBJECT B HAS A
TEMPERATURE OF 125K. HOW DOES HEAT FLOW? What happens to the
temperature of each object?
Answer:
The law of heat conduction, also known as Fourier's law, states that the time rate of heat transfer through a material is proportional to the negative gradient in the temperature. As the temperature difference is bigger, the rate of temperature change will be bigger.
Explonation:
sorry if doesnt
help
If 15.0 g CH3OH reacts with 10.0 g of CO, which is the limiting reagent and what is the theoretical yield of CH3COOH?
Answer:
Explanation:
CH₃OH + CO = CH₃COOH .
32 g 28 g 60 g
CH₃OH = 15 g ; CO = 10 g
32 g of CH₃OH reacts with 28 g of CO
15 g of CH₃OH reacts with 28 x 15 / 32 g of CO
= 13.125 g of CO .
CO given = 10 g , so CO is the limiting reagent .
28 g of CO reacts with CH₃OH to produce 60 g of CH₃COOH
10 g of CO reacts with CH₃OH to produce 60 x 10 / 28 g of CH₃COOH
CH₃COOH produced = 600 / 28 g = 21.42 g .
Answer: CO
Explanation:
A chemical reaction yields 1 mole of lithium hydroxide (LiOH). How many grams of
lithium hydroxide are present?
3 g
48 g
728
24 g
Mass of LiOH= 23.95 grams ≈ 24 g
Further explanationGiven
1 mole of lithium hydroxide (LiOH)
Required
Mass of LiOH
Solution
The mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
n = mass : molar mass
Input the value :
mass = n x molar mass
mass = 1 mole x 23,95 g/mol
mass = 23.95 grams ≈ 24 g
The mass of 1 mole LiOH has been 24 g. Thus, option D is correct.
The mass of a compound present in a mole of sample has been equivalent to the molar mass of the compound. The molar mass of the compound has been the sum of the constituent in a formula unit.
The molar mass of lithium hydroxide (mwt) has been given as:
[tex]mwt=m_L_i\;+\;m_O\;+\;m_H[/tex]
Where, the mass of Li is [tex]m_L_i=6.941\;\rm g[/tex]
The mass of oxygen is [tex]m_O=16\;\rm g[/tex]
The mass of hydrogen is [tex]m_H=1\;\rm g[/tex]
Substituting the values for molar mass (mwt) of LiOH:
[tex]mwt=6.941\;+\;16\;+\;1\;\text g\\mwt=23.941\;\text g\\mwt=24\;\text g[/tex]
The molar mass of LiOH has been 24 g.
The molar mass has been equivalent to the mass of 1 mole of sample. Thus, the mass of 1 mole LiOH has been 24 g. Thus, option D is correct.
For more information about mass of mole, refer to the link:
https://brainly.com/question/1370888
What does evaporation do to salinity? Question 2 options: water molecules (H20) absorb energy where there are higher levels of evaporation, the water has greater salinity warmer water molecules move farther apart it does not impact salinity
Answer:
the water has greater salinity
Explanation:
The term "Salinity" refers to the amount of salt present in water. Recall that the amount of solute increases when the volume of solution decreases. This is because the amount of substance present in a solution depends on the volume of the solution.
Hence, as water evaporates, the volume of the solution decreases and the salinity (amount of salt present) increases.
Answer:
the water has greater salinity
Explanation:
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find the one out of place
What type of atmospheric pressure is associated with tornadoes,
hurricanes, and thunderstorms?
Answer:
Explanation:
The ingredients are warm ocean water, weak upper level winds, and low pressure. The warm ocean water supplies the moisture for the hurricane. The weak upper levels winds allow the developing hurricane to not tear apart, and the low pressure allows thunderstorms to develop.
Can someone help me answer this ASAP !!!
Answer: Chlorine I think
Explanation:
Chlorine is added to the water to kill germs. When it is added to a swimming pool, it forms a weak acid called hypochlorous acid that kills bacteria like salmonella and E.
Answer: Chlorine!
Explanation:
When it is added to a swimming pool, it forms a weak acid called hypochlorous acid that kills bacteria like salmonella and E. coli, as well as germs that cause viruses such as diarrhea and swimmer's ear.
How much heat is necessary to change 10.0g of water from 20 degrees celsius to 75 degrees celsius
Answer:
6
Explanation:
Calculate the number of moles found in 88.02g of CO2
Answer:
2.00moles
Explanation:
mol=mass/mr
88.02/ [12+2(16)] = 2.00