Answer:
0.3 kicalories
Explanation:
300/1000
=0.3
PLS GIVE BRAINLIEST
Select the conditions that are required for the formation of hurricanes. (Choose 3)
A: cold,cyclonic wind
B: deep ocean water
C: cold ocean water
D: warm,humid wind
E: warm ocean water
F: a strong cold front
Answer:
A: cold, cyclonic wind
B: deep ocean water
C: cold ocean water
E: warm ocean water
F: a strong cold front
You only need A, B, C, E, F not D because that for tornadoes buddy.
What can cause a mutation when the cell copies its DNA?
All of the above
Exposure to chemicals
Exposure to radiation
Errors
Answer:
exposure to radiation i think
Explanation:
During which change of state would the volume of a substance increase the most?
deposition
melting
vaporization
sublimation
Help me plz!
Answer:
Gas/vaporization
Explanation:
The most stare has the high volume is the gas state. So the answer is between vaporization and sublimation
Answer:
Submilation
Explanation:
Helpppppoop. Question 6 of 10
Which term best describes the state of matter modeled in the beaker?
A. Disorganized
B. Amorphous
C. Liquid
D. Solid
Answer:D. Solid
Explanation:
A. Disorganized
B. Amorphous
C. Liquid
D. Solid
How many electrons are located in the outermost energy level in the Bohr model of a boron atom? hint it not 4
4
3
2
1
Which of the following is a true difference between protons and neutrons?
a
the have different masses
b
they are in different locations in the atom
c
the proton identifies the atom and the neutrons does not
d
all of the choices are true
Answer:
D
Explanation:
7. The percentage, by mass, of phosphorus in
calcium phosphate Ca3(PO4)2 is
(Ca=40, P=31, O=16)
(2 Points)
8%
10%
17%
20%
Answer:
I am pretty sure that the answer is 20%
Which three statements about forces are true?
A. Some forces cause objects around us to move,
B. Force can cause changes in the motion and energy of matter,
C. Every force can be identified as one of the fundamental forces,
D. Force is the ability to change motion and transfer matter,
E. Some forces keep objects around us from moving,
Answer:
A. Some forces cause objects around us to move,
C. Every force can be identified as one of the fundamental forces,
D. Force is the ability to change motion and transfer matter,
Explanation:
Force basically is defined as pull or push on a body. Forces are known to cause the change in motion of a body as the amount of force applied is attenuated.
Every known force in the universe can be traced to the four fundamental forces which are gravitational force, electromagnetic, strong and weak forces. Force enables a body to change its motions by acceleration.Sodium hydroxide reacts with hydrochloric acid in a neutralization reaction. Will the temperature of the solution increase or decrease during this reaction?
Answer:
Increase.
Explanation:
All neutralization reactions are actually exothermic (meaning they exude heat).
Hope this helped!
What properties do all basses have?
You have two cubes that have the same color and volume. You drop them in water, one sinks and the other floats. What property did you demonstrate for the two substances? And, is it a chemical or physical property?
Answer:
The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition. Although we call them physical "reactions," no reaction is actually occurring. In order for a reaction to take place, there must be a change in the elemental composition of the substance in question. Thus, we shall simply refer to physical "reactions" as physical changes from now on.
Introduction
Physical changes are limited to changes that result in a difference in display without changing the composition. Some common changes (but not limited to) are:
Texture
Color
Temperature
Shape
Change of State (Boiling Point and Melting Point are significant factors in determining this change.)
Physical properties include many other aspects of a substance. The following are (but not limited to) physical properties.
Luster
Malleability
Ability to be drawn into a thin wire
Density
Viscosity
Solubility
Mass
Volume
Any change in these physical properties is referred to as a physical change. For further information, please refer to Properties of Matter.
Chemical changes, on the other hand, are quite different. A chemical change occurs when the substance's composition is changed. When bonds are broken and new ones are formed a chemical change occurs. The following are indicators of chemical changes:
Change in Temperature
Change in Color
Noticeable Odor (after reaction has begun)
Formation of a Precipitate
Formation of Bubbles
Note: When two or more reactants are mixed and a change in temperature, color, etc. is noticed, a chemical reaction is probably occurring. These are not definite indicators; a chemical reaction may not be occurring. A change in color is not always a chemical change. If one were to change the color of a substance in a non-chemical reaction scenario, such as painting a car, the change is physical and not chemical. This is because the composition of the car has not changed. Proceed with caution.
50 chemical equations
Answer:Hey there
Here are 50 simple balanced chemical equations...
1) 2Fe2O3+3C--->4Fe+3CO2
2)H2SO4+
CaCO3--->CaSO4+H2CO3
3) 2H2+02--->2H20
4) CH3COOH+
C2H5OH ---> CH3COOC2H5
+H2O
5) 1 AgNO3 + 1 LiOH --> 1 AgOH + 1 LiNO3
6) CH4+2O2--->CO2+2H2O.
7) Sn+2H2SO4-->SnSO4+2H2O
+SO2
8) CuO+H2SO4--->CuSO4+H2
9) Mg3N2 + 3H2O ---> 3MgO + 2NH3
10) N2 + O2 ---> 2 NO
11) 2 CH4 + 3 O2 ---> 2 CO + 4 H2O
12) 6 CO2 + 6 H2O ---> C6H12O6 + 6 O2
13) 2 AgI + Na2S ---> Ag2S + 2 NaI
14) Ba3N2 + 6 H2O --->
3 Ba(OH)2 + 2 NH3
15) 4 FeS + 7 O2 --->2 Fe2O3 + 4 SO2
16) PCl5 + 4 H2O ---> H3PO4 + 5 HCl
17) 3 CaCl2 + 2 Na3PO4--->Ca3
(PO4)2 + 6 NaCl
18) 2 As + 6 NaOH --->2 Na3AsO3 + 3 H2
19) 12 HClO4 + P4O10 ---> 4 H3PO4 + 6 Cl2O7
20) 10 KClO3 + 3 P4 ---> 3 P4O10 + 10 KCl
21) SnO2 + 2 H2 ---> Sn + 2 H2O
22) 3 KOH + H3PO4 ---> K3PO4 + 3 H2O
23) 3 Hg(OH)2 + 2 H3PO4 ---> Hg3(PO4)2 + 6 H2O
24) 2 KNO3 + H2CO3 ---> K2CO3 + 2 HNO3
25) Na3PO4 + 3 HCl ---> 3 NaCl + H3PO4
26) TiCl4 + 2 H2O ---> TiO2 + 4 HCl
27) C2H6O + 3 O2 ---> 2 CO2 + 3 H2O
28 4 NH3 + 5 O2 ---> 4 NO + 6 H2O
29) B2Br6 + 6 HNO3 ---> 2 B(NO3)3 + 6 HBr
30) 8 CO + 17 H2 ---> C8H18 + 8 H2O
31) 4 NH4OH + KAl(SO4)2·12H2O ---> Al(OH)3 + 2 (NH4)2SO4 + KOH + 12 H2O
32) 2 Fe + 6 HC2H3O2 ---> 2 Fe(C2H3O2)3 + 3 H2
33) N2+3H2--->2NH3
34) N2 + 3H2 ---> 2NH3
35) Al2O3+3H2SO4--->Al2
(SO4)3 +3H2O
36) HCl+NH3--->NH4Cl
37) 2Na + 2H2O = 2NaOH + H2
38) C6H12O6--->6C+6H2O
39) CuO+H2SO4--->CuSO4+H2
40) COH12O6--->2CO2
+2C2H5OH
41) FeCl3+Fe2O3--->3FeOCl
42) NaCl+AgNO3--->NaNO3
+AgCl
43) HCl+NH3--->NH4Cl
44) 2Al+6HCl--->2AlCl3+3H2
45) Ca + 2HCl = CaCl2 + H2
46) CaCO3 + H2SO4 = CaSO4 + H20 + CO2
47) 3H2SO4 + 2Fe ---> Fe2(SO4)3 + 3H2
48) Mg3N2 + 3H2O ---> 3MgO + 2NH3
49) CH4+ O2 ---> CO2 + H2O
50) Cl2 + SO2 + H2O ---> HCl + H2SO4
If I have repeated any equation, please do tell me.
Hope this helps you dear!!
Explanation:
The sum of the protons and neutrons in an atom equals the?
nucleus number
atomic number
atomic mass
mass number
Answer:
mass number
Explanation:
The sum of the protons and neutrons in an atom equals the mass number of such an atom.
Mass number is the mass of an atom. The mass of an atom is concentrated in the nucleusThe particles in the nucleus are the protons and neutrons.So;
Mass number = number of protons + number of neutrons.
help asap
i have to get a good grade on this
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%?
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
After the addition of the iron, the test tube now contains iron (II) sulfate solution and copper
particles. The iron has become part of a
A
compound with the sulfate, which must be separated through chemical methods
B
compound with the sulfate, which can be separated through physical methods
C.
mixture with the sulfate, which must be separated through chemical methods
D. mixture with the sulfate, which can be separated through physical methods
The iron has become part of a A. compound with the sulfate, which must be separated through chemical methods.
Iron (II) sulfate is also referred to as ferrous sulfate is a reducing agent. The hydrates form is used for the treatment of iron deficiency.
It should be noted that a chemical change is involved in the formation of iron (II) sulfate. It can't be separated by physical means and isn't reversible.
In this case, iron (II) sulfate will be separated by chemical methods.
Read related link on:
https://brainly.com/question/18731255
Iron sulfate is a compound which can be separated through chemical methods.
Iron is present in a compound form with the sulfate, which must be separated through chemical methods because both iron and sulfate reacts with each other through making of chemical bonds with each other. Those elements that combine with each other chemically at a fix ratio can be separated from each other through chemical methods.
While on the other hand, in mixture substances combine with each other physically so they can be separated from each other through physical methods so we can conclude that iron sulfate is a compound which can be separated through chemical methods.
Learn more: https://brainly.com/question/19182491
Magnesium nitrate, Mg(NO3)2, will decompose when heated to give a white solid and a mixture of
gases. One of the gases released is an oxide of nitrogen, X.
7.4g of anhydrous magnesium nitrate is heated until no further reaction takes place.
What mass of X is produced?
B 2.3g
C 3.05
D 4.6g
Mass of X produced : D. 4.6 g
Further explanationReaction
Decomposition of Magnesium nitrate into Magnesium oxide, Oxygen, and Nitrogen oxides
2 Mg(NO₃)₂ → 2 MgO + 4 NO₂ + O₂
mol Magnesium nitrate-Mg(NO₃)₂(MW=148,3 g/mol) :
[tex]\tt \dfrac{7.4}{148.3}=0.05[/tex]
mol ratio Mg(NO₃)₂ : NO₂ = 2 : 4, so mol NO₂ :
[tex]\tt \dfrac{4}{2}\times 0.05=0.1[/tex]
mass NO₂(MW=46 g/mol) :
[tex]\tt 0.1\times 46~g/mol=4.6~g[/tex]
.
PLEASE HELP
Wich two changes of state can be caused by removing thermal energy from a
substance.
A. Deposition
B.vaporization
C.sublimation
D.condensation
Answer:
Condensation
Explanation:
When thermal energy is added ti a substance the temperature rises, this causes solids to melt, liquid ti evaporate, or a solid to sublimate. when the pressure is applied to a substance, it can cause thus substance to condense.
gold has a density of 19.3 g.cm3. Iron pyrite, commonly known as fools gold because of its colour, has a density of 5.02 g/cm3. Suppose that you find a golden solid that has a mass of 25.04g and a volume of 4.99 cm3. have you found gold or iron pyrite? pls help!!
Answer:
Compare qualitative and quantitative physical properties. Use examples of properties listed in Tables 4.2 and .3 as part of your answer
can be observed and described without detailed measurement, usually obvious and easy to observe. For example, odor can be described as sweet, pungent and or moldy.
Quantitative Physical Properties
can be measured and assigned a value, for example melting points and boiling points could be considered a quantitative physical property
Why is the melting point considered a physical property?
Because you are not creating a new substance in the process of melting it. If you melt gold, it will still remain gold just in a different form.
What property determines the choice of material that is used for the inside of an electrical wire and the material that is used for the outside of the wire?
The conductivity of the material will determine the material needed for both the inside and outside of an electrical wire. The electrical wires ability to conduct electricity, or give off heat will allow us to have an idea as to what type of material may insulate or protect the electrical wire.
When might a large volume of material have little mass?
When the material weighs less. For example, Styrofoam with the volume of 500 cm (cubed) has a smaller mass in comparison to 500 cm (cubed) of Gold. Since the density in Styrofoam is little, the mass of it would also be little in contrast to an element like gold, which has a higher density therefore it has a higher mass.
Gold has a density of 19.3g/cm (cubed). Iron pyrite, commonly known as fool's gold because of its color, has a density of 5.02g/cm (cubed). Suppose you find a golden solid that has the mass of 25.04g and a volume of 4.99 cm (cubed). Have you found gold or iron pyrite?
Do the math
The density of red wine vinegar is 1.01g/cm (cubed), and the density of olive oil is 0.92g/cm (cubed). A salad dressing consisting of these two ingredients was left sitting too long. The ingredients separated in the bottle. Which ingredient is in which layer?
do the math
Water is unique because the density of its solid, ice, is less than the density of its liquid. Describe how life would be if this were not true.
think about it and say it out loud
What happens when molecules diffuse across the cell membrane?
Answer:
The correct answer is from areas of high concentration to low concentration.
Explanation:
A concentration gradient exists for these molecules, so they have the potential to diffuse into (or out of) the cell by moving down it.
Hope this Helps!
To soften cloths in the wash it is recommended to use 2.0 g of sodium borate per liter of water. If a filled washing machine holds 10 L of water and the correct amount of sodium borate per liter is added, what is the concentration in percent mass/volume of the solution?
% m/v of the solution = 0.2%m/v
Further explanation[tex]\tt Percent~m/v=\dfrac{mass~solute(g)}{volume~solution(ml)}\times 100\%[/tex]
or
% m/v = g solute / 100 ml solution
Concentration : 2 g sodium borate / L water
For 10 L⇒20 g Sodium borate
[tex]\tt \%m/v=\dfrac{20~g}{10,000~ml}\times 100\%\\\\\%m/v=0.2\%[/tex]
Which of these is not true about weight
A:it is measurement of how heavy an object is
B:it is always the same mass,regardless of gravity
C:it is affected by objects mass and the force of gravity
D:it’s is commonly measured in pounds
Answer:
its b beacuse different things have different mass
Which statement is a testable hypothesis?
A. Beans are the best plants to use in a science fair experiment.
B. Watering bean plants with salt water will make them grow faster.
C. Bean plants will become extinct before corn plants do.
D. Everyone can grow beans given the right instructions.
please help. i’ll give brainliest if ur answer is correct
Answer:
b
Explanation:
I think B because its saying that perhaps watering with salt water would make them grow faster, you don't know yet unless tested.
BRAINLIEST
What is kinetic energy? Give an example of kinetic energy.
energy which a body possess by virtue of being in motion
ex: a river flowing at a certain speed comprises kinetic energy as water has a certain velocity and mass
mark all the things that can be chnaged about a chemical equation when it is being balanced
Answer:
a and b
Explanation:
Part of a chemical equation is shown below 2koh + h2so4 .
Wich pair of chemicals most likely comes after the arrow to complete the equation.
Answer: K2SO4 + 2H2O
Explanation:
I got it right
Answer:
K2SO4 + 2H2O
Explanation:
How many moles are in 640.00 grams of Glucose (C6H1206)?
Express your answer rounded to 2 decimal places
Answer:
3.56 molesExplanation:
The number of moles of glucose can be found by using the formula
[tex]n = \frac{m}{M} \\ [/tex]
where
n is the number of moles
M is the molar mass
m is the mass of the substance
First we must find the molar mass of glucose
[tex]M(C) = 12 , \: \: \: M( H_2) = 1 \: \: , \: \: M(O_2) = 16 \\ [/tex]
The molar mass of glucose is
[tex]M(C_6H_{12}O_6) = (12 \times 6) + 12 + (16 \times 6) \\ = 72 + 12 + 96 \\ \\ = 180 \: \: g/mol \: \: \: [/tex]
mass = 640 g
So we have
[tex]n = \frac{640}{180} = \frac{64}{18} = \frac{32}{9} \\ = 3.5555..[/tex]
We have the final answer as
3.56 moles to 2 decimal placesHope this helps you
PLEASE HELP!!!!!
a) Use your knowledge of atoms, bonding, and the periodic table to complete the chemical equation
and predict the products of the chemical reaction on your paper. Label this equation “Initial
Prediction.”
CH4 + O2 ----->___________
Answer:
{CH4 +2O2 ->CO2 + 2H2O}}}
Answer:
CH4 + 202----->CO2 + 2H2O
Match the term (Endothermic) with the correct definition
energy goes into the chemical and cool downs the surrounding area.
energy leaves the chemical and cools down the surrounding area
energy leaves the chemical and heats up the surrounding area
Answer:
energy goes into the chemical and cool downs the surrounding area.
1.) Fluorite has a glassy luster and a white streak. It's an inorganic solid with a chemical formula of CaF2 CaF2
A: It is inorganic
B: It is a solid
C. It can be defined by a chemical formula
D. All of the above
Answer:
D. All of the above
Fluorite is inorganic solid and can be defined by its chemical formula. Thus option D is correct.
What is chemical formula?Chemical formula is defined as a chemical elements numbers and symbols are used to provide information about the chemical quantities of atoms that make up a certain chemical compound or molecule.
It is also defined as any of numerous statements of a chemical compound's content or structure.
There are mainly three types of chemical formulas.
Empirical formulaMolecular formulaStructural formulaThus, fluorite is inorganic solid and can be defined by its chemical formula. Thus option D is correct.
To learn more about chemical formula, refer to the link below:
https://brainly.com/question/11995171
#SPJ5