Science 3 questions with brainliest
Answer:
#1 is c #2 is d and #3 isd
Explanation:
Answer and explain why you chose it
Answer:
Umm I think it 2
Explanation:
3. Which of the following is the correct mathematical expression to use to
calculate the pH of a 0.10 Maqueous Ba(OH)2 solution at 25°C ?
Answer:
The pH of a 0.10 Maqueous Ba(OH)2 solution at 25°C is 13.30
Explanation:
The balanced equation is Ba(OH)2(s)→Ba2++2OH−
This indicates that the concentration is 0.2 M
We will find H+ ion concentration
As we know that
[H+][OH−]=1.0×10−14M
Given -
[OH−]=2.0×10−1M
Putting value of [OH-] in above equation we get -
[H+]=5.0×10−14M
pH=−log10[H+]
pH=−log10[5.0×10−14] = 13.30.
How do you recognize substances that have gone through physical or chemical changes?
How will popcorn protect a egg by reducing the force of impact on the egg? How does it work?
Answer:
The popcorn will take less impact because the force goes into the popcorn serving as a cushion for the egg. The egg will take less damage because the force will cancel out.
Explanation:
350.0 ML of air is at 23.0°C what is the volume at 90.0°C
Answer:
V=0.430 Liters
Explanation:
First off you need to convert ml to l and celsius to kelvin, in order for them to be in the S.I.
So, 350.0mL is 0.350 L and 23.0 C is (273.15+23=) 296.15 K (you can ignore the 0.15)
From the equation pV=nRT, lets name this equation (1), we can tell that the number of moles, pressure, and R, stay the same. The only thing changing is the volume, and temperature.
With the information given, let's figure out the pressure. From equation (1) if we solve it for the pressure of the gas, p=nRT/V => p=nR*296.15/0.350 => p=846.15 *nR
Now, we have to figure out the volume of the gas at 90.0 C (363.15 K), and solve equation (1) for volume, using the pressure we previously found.
v=nRT/p => v=nR*363.15/846.15*nR => (the nR's from top and bottom go away) v=0.429 L
Since we used 273.15 for the conversion of celsius to Kelvin, we could round up the number to
V=0.430 Liters
Acids are what and can destroy your skin and bones.
Answer:
Yes
Explanation:
Hydrofluoric acid (HF) differs from other acids because the fluoride ion readily penetrates the skin, causing destruction of deep tissue layers, including bone.
What causes thermal pollution in rivers?
1. automobile exhaust
2. nuclear power plants
3. solar radiation
4. factory smokestacks
Answer:
nuclear power plants .....
6. The substance whose Lewis structure shows triple covalent bonds is
a. Hydrogen dioxide
b. Nitrogen trihydride
c. Carbon monoxide
d. Carbon tetrachloride
Answer: b) Nitrogen trihydride should be the answer.
Explanation:
Nitrogen trihydride is the substance whose Lewis structure shows triple covalent bonds. Hence option is correct.
What are covalent bonds?Covalent bonds are defined as the shared electron pair between two atoms that creates an interatomic bond. At room temperature, covalent compounds can be found in all three of their physical states and often have low boiling and melting temperatures. Covalent substances don't carry electricity.
Lewis structure are defined as a structural depiction of a molecule using lines or pairs of dots to represent covalent bonds between atoms and dots to show the locations of electrons surrounding the atoms. The goal of creating a Lewis dot structure is to locate lone electron pairs in molecules in order to better understand how chemical bonds are formed. In chemistry, a triple bond is a covalent connection where two atoms share three pairs of electrons, such as in the nitrogen molecule (N2) or the acetylene molecule (C2H2).
Thus, Nitrogen trihydride is the substance whose Lewis structure shows triple covalent bonds. Hence option is correct.
To learn more about Lewis structure, refer to the link below:
https://brainly.com/question/20300458
#SPJ6
A scientist suggests putting solar panels on homes to supply energy because it is usually sunny there. The amount of sun is BEST described as characteristic of which property of the area?
A. Weather
B. Climate
C. Food webs
D. Gravity
Answer:
the answer is a because if u have good wheather the panels will for no matter what
The pressure in a certain tire is 109 kPa, what is the pressure of the air in the tire in
psi?
Answer:
pressure ranges between 30 and 35 PSI
Explanation:
Answer:
1.08 atm
Explanation:
I hope you pass !!
please help i will make you brainliest A water feature that could be a source of groundwater for humans is found at a location on a hillside where Earth’s surface is lower than the water table.
What type of feature might be observed at this location?
spring
aquifer
artesian well
unsaturated zone
Answer:
Spring
Explanation:
Spring is a place where water moving underground finds an opening to the land surface and emerges, sometimes as just a trickle, maybe only after a rain, and sometimes in a continuous flow. ... Note: This section of the Water Science School discusses the Earth's "natural" water cycle without human interference.
Answer:
aquifer=b
Explanation:
hope it helps
Vertical columns in the periodic table are called ______ of elements and have similar properties.
groups
period
The difference between the potential energy of the products and the potential energy of the reactants is *
Change in entropy
Heat of reaction
Activation energy
Reaction complex
Answer: Heat of reaction
Explanation:
Change in entropy is the difference between the entropy of products and the entropy of reactants.
Heat of reaction is the energy released or absorbed during the course of the reaction. It is difference between the potential energy of the products and the potential energy of the reactants.
Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.
Reaction complex is the short lived intermediate formed when reactants are coverted to products.
If 0.583 g of ammonia (NH3) is dissolved to make 250 mL of solution, what is the molarity?
Answer:
0.137 M NH3
Explanation:
First divide the mass of NH3 by the molar mass of NH3, and then divide by the volume to get molarity.
0.583 g / 17.031 g/mol = 0.0342 mol NH3
0.0342 mol NH3 / 0.250 L = 0.137 M NH3
Nhich types of native organisms do feral hogs most likely compete with for food sources?
F.
Carnivores and producers
G.
Herbivores and carnivores
H.
Producers and decomposers
J.
Decomposers and herbivores
How many moles of Fe are needed to react with 0.95 moles of 02? Show work
Answer:
4
Explanation:
1N2 + 3H2 2NH3
PLEASE ME!!!! ANSWER IF YOU KNOW THE ANSWER
Answer:
organism 1
Explanation:
the arrow points away from it so that means that it is being eaten and it always starts from a producer so organism 1 is likely a producer :)
Use the drop-down menus to complete each
phrase describing voltaic cells.
Redox reactions involve a transfer of
Voltaic cells are also known as
cells.
Voltaic cells are composed of two separate
cells.
The physical material where the redox reactions
occur is called the
Answer:
electrons
galvanic
half-
electrode
Explanation:
I got it right :)
The words that complete each of the blanks in the question are;
electronsgalvanichalf-electrodeWhat is a voltaic cell?A voltaic cell is one that produces energy by a sponteanous chemical reaction. A voltaic cell is a type of electrochemical cell.
The following are the words that complete the individual blanks';
electronsgalvanichalf-electrodeLearn more about voltaic cell: https://brainly.com/question/14356798
What is the compound charge for Strontium phosphide?
Explanation:
¿Cuál es la carga compuesta para el fosfuro de Aluminum phosphide is a chemical compound with the formula AlP; Phosphine gas generator which is extremely toxic to any living being. estroncio?
P4O10 + 6H20 → 4H3PO4
If 30 g of H2O reacts with 40g of P4O10, what is the limiting reactant? How much H3PO4 can be formed?
Answer: [tex]P_4O_{10}[/tex] is the limiting reagent
66.6 g of [tex]H_3PO_4[/tex] will be formed.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex] [tex]\text{Moles of} P_4O_{10}=\frac{40g}{284g/mol}=0.14moles[/tex]
[tex]\text{Moles of} H_2O=\frac{30g}{18g/mol}=1.7moles[/tex]
[tex]P_4O_{10}+6H_2O\rightarrow 4H_3PO_4[/tex]
According to stoichiometry :
1 mole of [tex]P_4O_{10}[/tex] require 6 moles of [tex]H_2O[/tex]
Thus 0.14 moles of [tex]P_4O_{10}[/tex] will require=[tex]\frac{6}{1}\times 0.14=0.84moles[/tex] of [tex]H_2O[/tex]
Thus [tex]P_4O_{10}[/tex] is the limiting reagent as it limits the formation of product and [tex]H_2O[/tex] is the excess reagent.
As 1 mole of [tex]P_4O_{10}[/tex] give = 4 moles of [tex]H_3PO_4[/tex]
Thus 0.17 moles of [tex]P_4O_{10}[/tex] give =[tex]\frac{4}{1}\times 0.17=0.68moles[/tex] of [tex]H_3PO_4[/tex]
Mass of [tex]H_3PO_4=moles\times {\text {Molar mass}}=0.68moles\times 98g/mol=66.6g[/tex]
Thus 66.6 g of [tex]H_3PO_4[/tex] will be formed.
What is the acceleration due to gravity?
Answer:
The numerical value for the acceleration of gravity is most accurately known as 9.8 m/s/s. There are slight variations in this numerical value (to the second decimal place) that are dependent primarily upon on altitude.
Explanation:
sorry if i'm wrong
correctly label the picture with the correct phase
Answer:
solid goes on the first on and liquid goes on the sceond one
A piece of metal is composed of atoms. Each atom in the metal contains 29 protons. How is the metal classified?
Answer:
Explanation:
The metal is classified as a transition metal or transition element. In particular, this atom is Copper it has an atomic number of 29 which we know by the number of protons. The number of protons in an atom is the same as the atomic number.
Answer:
Copper
Explanation:
Each atom in the metal contains 29 protons.
Determine the number of moles in 300 g S.
The number of moles present in 300 g of glucose is 1.7 moles or 2 moles approximately.
Explanation:
i did glucose cause i dont know what u meant by the S?
What of the following is NOT a common property of metals?
Answer:
have luster i think i dont know
Explanation:i need points
Which of the following is the best example of a symbiotic relationship?
Certain breeds of fish will often clean bigger fish. The cleaner fish gets food, the bigger fish gets a cleaning.
or
A foolish man decides to go swimming in shark-infested waters. As a result, he is bitten by a shark looking for food.
or
A pair of birds fight over a piece of food. The dominant bird wins.
or
The climate changes. As a result, hundreds of species become extinct and the land turns into a desert.
?
Answer:
Certain breeds of fish will often clean bigger fish. The cleaner fish gets food, the bigger fish gets a cleaning.
I'm not too sure.
Good luck! <3
What plants need in order for photosynthesis to occur
A) Photosynthesis
B)Products
C)Chloroplasts
D)Glucose
Answer:
for photosynthesis to occur you need chloroplasts, light, water and carbon dioxide. hopefully that helps
what are some ways that you can change the physical phase of matter?
How does matter change from one state to another
Answer:
Adding or removing energy can change the physical matter.
Explanation:
Like for example changing temperature
Describe the molecular structure of the three main types of lipids
Brainliest!!!!!
Answer:
Lipids are divided into three categories.
Triglycerides, phospholipids, and sterols are the three major forms of lipids.