Answer:
When you move atoms toward each other, the electrons move around between the two atoms. When you try to move the atoms two close, their positive nuclei repel each other.
The heating curve shows the energy gain of a substance as it changes from solid to gas. Which section of graph shows the liquid phase of a substance gaining kinectic energy ?
Answer:
section c
Explanation:
section A shows the soild state
section B shows the transition of solid to liquid
section C shows the the pure liquid state
section D shows the transition of liquid to gas
section E shows the pure gas state
When two continental plates diverge, there is a valley in between these two plates that forms as the continental crust widens. What geological event is
a result of this interaction?
A) Hurricanes
B) Volcanoes
C) Tsunamis
D) Earthquakes
Answer:
B. Volcanoes
Explanation:
B. Volcanoes
Answer:
B:Volcanoes
Explanation:
because valley rift develops
Determine the empirical formula of a compound containing 63.50 % silver, 8.25 % nitrogen, and the remainder oxygen.
Answe AgNO₃
1:1:3 ratio
Can someone help me please?
Answer:
SUN
Explanation:
Hope this helps! Plz mark as brainliest!
what is the mass of 0.23 moles of CF4? *
error loading answer
Answer:
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NEEED HELPPPP PLEASE
Answer:
full
Explanation:
Please help. I am putting the rest of my points on this because i need this completed. see attached file
Answer:
balanced equation of glucose
6CO2 + 6H2O----------C6H12O6 + 6O2
in the presence of sun light.
Balance the following equation. What is the coefficient for hydrogen fluoride?
SiO2 + HF →→SiF4 +H2O
A) 3
B) 2
C) 1
D) 4
Answer:
ans .4
Explanation:
SiO2 +HF ⇒ SiF4 +H2O
reactant side product side
Si = 1 Si = 1 its balanced
O = 2 O = 1 (× WITH 2 ) we got O =2 And H = 4
H = 1 H = 2 NOW H =4
F= 1 (×4) F = 4
now we get SiO2 +4 HF ⇒SiF4 +2 H2O
After multiply with number again check it. Si = 1, O = 2 ,H=4 ,F=4
The coefficient for hydrogen fluoride is 4.
The correct option is D, 4.
What is hydrogen fluoride?It is a chemical compound with chemical formula HF.
It is a colorless gas or liquid.
[tex]\rm SiO_2 +HF = SiF4 +H_2O[/tex]
We will calculate the moles of compounds on both side
Reactant side Product side
Si = 1 Si = 1 its balanced
O = 2 O = 1 (multiply it by 2)
o =2 and H = 4
H = 1 H = 2 NOW H =4
F= 1 (×4) F = 4
The balanced equation is
[tex]\rm SiO_2 +4 HF =SiF_4 +2 H_2O[/tex]
Thus, The coefficient for hydrogen fluoride is 4.(D).
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How many molecules of NaOH are in 23
moles of NaOH
5. What kind of model is represented in the image below?"
A. mathematical
B. physical
C. virtual
Answer:
virtual
Explanation:
because we cannot touch or sense it
How many moles of a gas are in a 2.2-liter balloon at 600 mmHg and 85 C. Also asks to identify the P, V, N, R, and T. If unknown then put "?"
We have that for the Question "How many moles of a gas are in a 2.2-liter balloon at 600 mmHg and 85 C." it can be said that Moles of gas is
n= 0.059 moles of gas
From the question we are told
How many moles of a gas are in a 2.2-liter balloon at 600 mmHg and 85 C. Also asks to identify the P, V, N, R, and T. If unknown then put "?"
Generally the equation for the is mathematically given as
[tex]P=\frac{600}{760}\\\\P=0.789atm[/tex]
Therefore
[tex]n=\frac{PV}{RT}\\\\Therefore\\\\n=\frac{PV}{RT}\\\\n=\frac{0.789*2.2}{0.08206*(85 + 273)}\\\\[/tex]
n= 0.059 moles of gas
Therefore
Moles of gas is
n= 0.059 moles of gas
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Why does shaking the drink crystals in a water bottle help the solute dissolve faster?
Answer:
Shaking exposes the salts to the solvent more quickly. Shaking helps more water evaporate. Shaking equalizes the water temperature. Shaking causes more ions to precipitate out of solution.
Explanation:
What is the identity of the element that has 19 protons and 22 neutrons?
Answer:
A titanium ion
Do all materials respond to heat in the same way?
Answer:
No.
Materials like water get evaporated when heated, but materials like camphor get sublimed that is they directly get converted into gaseous form when heated, while materials like copper gets melted on heating
What medium do selsmic waves travel through?
A
The alr
B
The ground
C
Water
D
Outer space
someone help ,, I'll give brainliest lolll .
Answer:
The last one
Explanation:
Hydrogen gas and nitrogen gas are used to make ammonia (NH3). Calculate the rate of reaction if the concentration of hydrogen changed from 0.74 M to 0.088 M over 65
seconds
Answer:
(b) The change favors the reactants which has more gas molecules. ... Describe the effect of increasing the concentration of nitrogen gas or hydrogen gas inside the ... (c) The change causes an decrease in ammonia favoring the reactants. ... (c) Catalysts do not affect the equilibrium only the rate of reaction
HELP PLSSS
A 2.5 L container holds a sample of hydrogen gas at 297 K and 120 kPa.
If the pressure increases to 330 kPa and the volume remains constant, what will the new temperature be?
Round your answer to one decimal place.
Answer:
T2 = 816.8 ( To one d.p)
Explanation:
Volume= 2.5 L
Initial Temperature T1 = 297 K
Initial Pressure P1 = 120 kPa
Final Pressure P2 = 330 kPa
Final Temperature T2 = ?
The relationship between pressure and temperature is given by the equation;
P1 / T1 = P2 / T2
T2 = P2 * T1 / P1
Inserting the values;
T2 = 330 * 297 / 120
T2 = 816.75 K
Please help with these two I’ll give you brainiest!
When a sound is louder what
measurement gets bigger?
Answer:
amplitude or pitch
Explanation:
I need help with this!
Answer:
FILTRATION.
filter the solution and separate sand and salt solution
evaporation
evaporate the water and salt mixture and salt will be left as a solid
Variables – this experiment tests how the temperature of water affects the time it takes for antacid tablets to dissolve. (they drop an antacid in hot water and one in cold water)
• What is the independent variable? (2 points)
• What is the dependent variable? (2 points)
Explanation:
You can think of independent and dependent variables in terms of cause and effect: an independent variable is the variable you think is the cause, while a dependent variable is the effect. In an experiment, you manipulate the independent variable and measure the outcome in the dependent variable.
As a human being, we are considered to be a ..... because we rely on other organism for food
Answer:
As a human being, we are considered to be a heterotroph because we rely on other organisms for food.
Which of the following describes an exothermic reaction?
An exothermic reaction is described by ΔH(reactants) is greater than ΔH( products) and the correct option is option A.
What is Exothermic reaction?The word exothermic means “releasing heat.” Energy, often in the form of heat, is released as an exothermic reaction proceeds.
Enthalpy of a reaction is defined as the heat energy change (Δ H) that takes place when reactants go to products. If heat is absorbed during the reaction, Δ H is positive; if heat is released, then Δ H is negative.
ΔH value negative –> energy released –> exothermic reaction
ΔH value positive –> energy absorbed –> endothermic reaction
Therefore, an exothermic reaction is described by ΔH(reactants) is greater than ΔH( products) and the correct option is option A.
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Weather conditions (high or low temperature) to the mineral wool.
Answer:
high temperature
Explanation:
find the density of an object that has mass of 5kg and a volume of 50cm3
Answer:
100g/cm^3
Explanation:
density=mass/volume
convert mass in kg to g
1kg=1000g
5kg=5000g
therefore, density=5000g/50cm^3
=100g/cm^3
Write the net ionic equation of HNO3+Fe--> Fe(HNO3)2 +H2
Answer:
nitric acid + iron=iron+[nitric acid ] 2 hydrogen
The net ionic equation will be Fe → [tex]Fe^{2+}[/tex].
What is net ionic equation?The net ionic equation would be a chemical equation which only indicates the elements, compounds, as well as ions instantly involved in a chemical reaction.
The given chemical equation is:
HNO3+Fe → Fe(HNO3)2 +H2
It can be written in term of ionic equation.
[tex]H^{+}[/tex] + [tex]NO_{3}^{-}[/tex]+Fe → [tex]Fe^{2+}[/tex] + [tex]H^{+}[/tex] + [tex]NO_{3}^{-}[/tex]
Hydrogen ion and nitrate ion will be canceled each other.
Hence, the net ionic equation will be
Fe → [tex]Fe^{2+}[/tex]
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How many grams are in 2.0 x 10-5 moles of uranium?
Answer choices
5.3 x 10-3 grams
4.8 x 10-3 grams
1.4 x 10-3 grams
2.2 x 10-3 grams
Answer:
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A buildup of charges in an object is called
Answer:
Static Electricity.
Explanation:
Static electricity is defined as 'an electric charge that has built up on an insulated body, often due to friction.' It is an outcome of the disparity among the positive, as well as, negative charges residing in a body or object and causes the charge to build up on the surface of the body. The accumulation of electric charges on the objects like wool, hair, silk, plastic, etc. causes them to possess static electricity. These charges stay on the surface until it is discharged or released through a source. Thus, 'static electricity' is the correct answer.
Which of these describes the flow of energy as rock salt is dissolved in water?
Answer:
When salt dissolves in water, sodium and chloride ions are pulled apart to form new weak bonds with water molecules. Pulling them apart takes energy, while forming new bonds with the water molecules releases energy. Hope it helped (=^･ｪ･^=)