Answer:
B
Explanation:
How is science related to ghost hunting?
Someone answer fast please and is the diagram i drew right?
Answer:
no you need to draw more circles
Explanation:
it needs to have a lot more particles
what does Molecular mean in a simple answer?
Answer questions 2 and 3
Please help me I need this correct or my grade drops and thank you if you answer my the questions.
Answer:
2:a-heterogenous
b-homogenous
c-heterogenous
d-heterogenous with water
3:Filtration is used to separate insoluble particles from a solution
Distillation is used to separate liquids with close but different boiling points e.g water and ethanol
Explanation:
2: homogenous mixtures form a uniform layer meaning that a mixture containing more than one layer is heterogenous
Round each number to two sig.figs.
13) 3.948
14) 11,561.06
15) 6,789.2
16) 112.6
17)0.00048888
18) 119.999
Answer:
13) 3.9
14) 12000
15) 6800
16) 110
17) 0.00049
18) 120
Explanation:
First we will look at the second digit of given values.
we will draw a line after second digit then we will look the digit after line.
It the digit after line which is 3rd digit is 5 or more than 5 then one will be added to the second digit.
It it is less than five then second digit remain same.
After this we will add zeros to the right till decimal point.
13) 3.948
Round to two significant figures = 3.9
14) 11561.06
Round to two significant figures = 12000
15) 6789.2
Round to two significant figures = 6800
16) 112.6
Round to two significant figures = 110
17) 0.00048888
Round to two significant figures = 0.00049
18) 119.999
Round to two significant figures = 120
The potential energy in molecules is stored in
Answer:
Energy, Molecules and Chemical Reactions. Energy, potential energy, is stored in the covalent bonds holding atoms together in the form of molecules. This is often called chemical energy. Except at absolute zero (the coldest temperature it is possible to reach), all molecules move.
what volume unit is greater than one liter
How far can you drive in 3 hours if you constantly go 120 km/h
Answer:
If you are going at 120km per hour then, you should be able to go 360km in 3 hours.
Explanation:
Okay so, just multiply 120x3 and you get 360
also, Dividing 120/60 (How many mins are in a hour) You get 2Kilometers per min
Hope this helps!
Calculate the density of sulfuric acid if 33.21 mL of the acid is 65.54 g.
Answer:
The answer is 1.97 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
We have
[tex]density = \frac{65.54}{33.21} \\ = 1.973501957...[/tex]
We have the final answer as
1.97 g/mLHope this helps you
What will happen if we keep the metallic can in a water bath having cold water.Give reason
Answer:
when a cold metallic is put in a water bath with cold water than the laws of thermodynamics and calorimetry suggests that both the solid and the liquid will engage in heat exchange until they attain equilibrium.
once they both are at equal temperature, no heat transfer will continue and the bodies will just stat in a packed atmosphere.
A metric meter would be most equivalent to which English standard measurement?
*
(A)inch
(B)yard
(C) foot
(D)gallon
Answer:
Inch
Explanation:
Hope This Helps
What is the atom in the nucleus?
A bar of copper has a mass of 216g and a volume of 24cm^3. What is the density of copper?
Answer:
The answer is 9 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 216 g
volume = 24 cm³
The density is
[tex]density = \frac{216}{24} \\ [/tex]
We have the final answer as
9 g/cm³Hope this helps you
What object has the least amount of atoms
Answer:
neutron stars are made out of neutrons, so there's definitely no atoms there. The sparse matter which is between stars or between galaxies, which is the majority of the mass in the universe
Explanation:
When salt dissolves in water, what type of substance is formed? (4 points)
Answer:
Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded by water molecules, as this diagram shows. Once this happens, the salt is dissolved, resulting in a homogeneous solution.
Explanation:
Number of H− ions in 5.22 g of SrH2
Answer:
moles H = 2 x 0.0649=0.130
ions = 0.130 x 6.02 x 10^23=7.81 x 10^22
There are 7.00 × 10²² H⁻ ions in 5.22 g of SrH₂.
First, we will convert 5.22 g of SrH₂ to moles of SrH₂ using its molar mass (89.64 g/mol).
[tex]5.22 g \times \frac{1 mol}{89.64 g} = 0.0582 mol[/tex]
Then, we want to convert 0.0582 moles of SrH₂ to molecules of SrH₂ using Avogadro's number: there are 6.02 × 10²³ molecules of SrH₂ in 1 mole of molecules of SrH₂.
[tex]0.0582 mol \times \frac{6.02 \times 10^{23} molecules }{mol} = 3.50 \times 10^{22} molecules[/tex]
The molar ratio of SrH₂ to H⁻ is 1:2. The number of H⁻ ions in 3.50 × 10²² molecules of SrH₂ is:
[tex]3.50 \times 10^{22} moleculeSrH_2 \times \frac{2ionH^{-} }{1moleculeSrH_2} = 7.00 \times 10^{22} ionH^{-}[/tex]
There are 7.00 × 10²² H⁻ ions in 5.22 g of SrH₂.
You can learn more about Avogadro's number here: https://brainly.com/question/13302703
how does the metallic character of the element change
Answer:
Metallic character decreases as you move across a period in the periodic table from left to right. This occurs as atoms more readily accept electrons to fill a valence shell than lose them to remove the unfilled shell. Metallic character increases as you move down an element group in the periodic table. This is because electrons become easier to lose as the atomic radius increases, where there is less attraction between the nucleus and the valence electrons because of the increased distance between them.
Why would two (2) chlorine atoms be stably bonded together?
Answer:
The two chlorine atoms are said to be joined by a covalent bond.
Explanation:
The reason that the two chlorine atoms stick together is that the shared pair of electrons is attracted to the nucleus of both chlorine atoms. Hydrogen atoms only need two electrons in their outer level to reach the noble gas structure of helium.
Two chlorine atoms are are said to be stably bonded together as the two atoms require 1 valence electron each to complete their octet which is achieved by formation of covalent bond.
What is a covalent bond?
Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.
Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.
Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.
Learn more about covalent bond,here:
https://brainly.com/question/19382448
#SPJ5
which intensive physical property is observed when droppings of a person seated inside a closed room has able to reach a person who is 1 meter away from him after sneezing? if you where that person, what would you do to avoid this?
Answer:
The right response will be "Speed".
Explanation:
Intensive or Individualized physical property becomes found when "speed" seems to be the excrement of either an individual who sits within a closed or contained environment that can hit a person one meter away after sneezing or coughing. This measure seems to be "meter per second", its a intense property.This is based on type of physical properties.
1) Speed is the intensive physical property.
2) i) Sneeze on my arm or into a tissue paper.
ii) cover my mouth and nose and wash away the droplets on my body afterwards.
The types of physical properties are;
- Intensive physical properties; They do not depend on the amount of object there. For example, speed, hardness, pressure, temperature e.t.c
- Extensive physical properties; they depend on the amount of object present e.g. Weight, volume, area e.t.c
Now, from the question, what makes the droppings from the sneezing get to someone 1 metre away is speed.From our earlier definition, we saw that speed is an intensive physical property.
Secondly, to prevent that dropping from going so far by 1 metre, if I were the one sneezing, I would have sneezed on my arm or on a tissue paper and clean it off.If I were at the receiving end of the sneeze, I would cover my nose and mouth and immediately go to wash off the droppings on my body.Read more at; brainly.com/question/21942870
. Ana has two mixtures. Mixture 1: marble and salt. Mixture 2: Salt and pepper She predicts she can easily separate the ingredients from mixture-1 by sorting out using her fingers. i) Do you think that Ana's prediction was right? Give reason for your answer
Answer:
No
Explanation:
No, Ana's prediction of sorting out : mixture 1 'marble salt' with by her fingers, ie handpicking is not right.
Marble & salt particles mixture can't be sorted by handpicking. They can be seperated by the method of sieving rather, as marble particles being bigger stay in the sieve & salt particles being smaller (finer) pass through it.
what kind of a bond do carbon and oxygen form?
Answer:
covalent bond
Explanation:
A carbon–oxygen bond is a polar covalent bond between carbon and oxygen. Oxygen has 6 valence electrons and prefers to either share two electrons in bonding with carbon, leaving the 4 nonbonding electrons in 2 lone pairs :O: or to share two pairs of electrons to form the carbonyl functional group.
A sample of iron occupies a volume of 10.0 cm3 . If the density of iron is 7.9 g/cm3 , what is the mass of the sample?
Answer:
The answer is 79 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question we have
mass = 7.9 × 10
We have the final answer as
79 gHope this helps you
A student estimated the volume of a liquid in a beaker as 200.0 mL. When she poured the liquid into a graduated cylinder she MEASURED the volume to be 198.2 mL. What is the percent error?
Answer:
The answer is 0.91 %Explanation:
The percentage error of a certain measurement can be found by using the formula
[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]
From the question
actual volume = 198.2 mL
error = 200 - 198.2 = 1.8
So we have
[tex]P(\%) = \frac{1.8}{198.2} \times 100 \\ = 0.90817356205...[/tex]
We have the final answer as
0.91 %Hope this helps you
does the space between the particles decrease or increase when matter changes it’s state to a solid?
Answer:
i pretty sure it decreses
Explanation:
Which statements about β turns are correct? Their purpose is to reverse the direction of the polypeptide chain. There are two types, I and II, which differ mainly in the conformation about the i+1 and i+2 residue amide bond. They typically contain large, hydrophobic residues. Their conformation is held in place through H bonds.
Answer:
The correct answer is - 1, 2, and 4 statements.
Explanation:
Beta and gamma turns are common plots or turns in proteins and contain intra-turn hydrogen bonds. This hydrogen bond is present between CO of residue i and NH of residue i+3 that holds the confirmation in beta turns.
Beta turns, assist the protein to get their globularity, as the aim of beta turns is to reverse the direction of the polypeptide. The two main of beta turns are type-I and type-Il. and their minor images are type-I and type-Il.
Thus, the correct answer is - 1, 2, and 4 statements.
We sprayed the flowers with water. They did not turn pink.
The fact that the flowers did not turn pink is an:
inference
interpretation
experiment
observation
i need the answer now please help me
Answer:observation
Explanation:
this is the answer because they saw it they know it is there. the flowers are pink and they saw that that’s what an observation is so the answer is an OBSERVATION
Explain why a coin is able to float on top of water in a glass.
Answer:
Surface tension is the result of water molecules pulling inward with a strong attractive force. This attractive force brings the molecules on the surface of the water close together and causes the surface of the water to be drawn toward the water molecules beneath the surface. Since there are no water molecules above the surface, there are uneven forces. This causes surface tension, allowing the coin to float on the water’s surface.
Explanation:
EDG
Convert the following . Show your work for full credit.( 2pts each: 16 pts)
1. 2 inches = _______________mm
2. 7 lb = _________________g
3. 3 ft.= _________________cm
4. 16 gallons = _________________L
5. 457° C = ____________________° F
6. 104° F = ____________________° C
7. 4 inches = __________________ cm
8. 57kg = ___________________lbs.
how would You describe the jumping pattern of the green frog shown below?
What does the green frog shown below look like?
Question 12 (1 point)
An ice cube with food coloring is placed in a glass of room temperature water. The
cold dye molecules begin to drop down from the ice cube to the bottom of the glass.
Which type of thermal energy is shown with the purple water in this glass?
This is an example of convection
This is an example of radiation
This is an example of conduction
Answer:
the answer is this is an example of convection
