Answers
The first two statements are the correct answers.
Related Questions
5. What kind of model is represented in the image below?"
A. mathematical
B. physical
C. virtual
Answers
Answer:
virtual
Explanation:
because we cannot touch or sense it
As a human being, we are considered to be a ..... because we rely on other organism for food
Answers
Answer:
As a human being, we are considered to be a heterotroph because we rely on other organisms for food.
Will mark brainliest
4 A solution which has a pH of 11:
A is more alkaline than a solution with a pH of 12.
B is less alkaline than a solution with a pH of 9
C is more acidic than water
D is less alkaline than a sodium hydroxide solution of the same concentration.
Answers
Answer:
D
Explanation:
A, B and C are incorrect since the greater the pH value, the more alkaline a solution is, and the pH of water is 7.
In the statement D, the pH of NaOH solution is 13 usually, so the given solution is less alkaline than NaOH solution, and I think of the same concentration is somewhat unnecessary.
I need help with this!
Answers
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
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
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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
HOW IS PHENOTYPE DIFFERENT THAN GENOTYPE?
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Answer: The genotype is the set of genes in our DNA which is responsible for a particular trait. The phenotype is the physical expression, or characteristics, of that trait. For example, two organisms that have even the minutest difference in their genes are said to have different genotypes.
Which of these describes the flow of energy as rock salt is dissolved in water?
Answers
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･^=)
Write the net ionic equation of HNO3+Fe--> Fe(HNO3)2 +H2
Answers
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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BRAINLIEST What can magnetic attraction and filtration both be used to do?
Put components together to make a mixture.
Put components together to make a compound.
Separate compounds into their components.
Separate mixtures into their components.
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Answer:
Separate compounds into their components
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 ?
Answers
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
2. How can you determine if an acid is binary when given the
formula?
Answers
Explanation:
Binary acids are molecular compounds that consists of two components.
The components are Hydrogen and a non metal. Examples of binary acids include; HCl, HF etc.
The way to identify binary acids is to spot the hydrogen and the non metal.
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.
Answers
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
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)
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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.
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 "?"
Answers
V = 2.2 L
T = 85°C
R = 0.08206 L atm / mol K
n = ?
I would start by converting the P from mmHg to atm, since our gas constant R uses atm.
600 mmHg • 1 atm / 760 mmHg = 0.789 atm = P
Then I would convert T from Celsius to Kelvin, since our gas constant R uses Kelvin.
85 + 273 = 358 K
Now you can solve PV = nRT for n, giving you:
n = PV/RT
n = (0.789 atm)(2.2 L) / (0.08206 L atm / mol K)(358 K) = 0.059 moles of gas
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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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
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Answer:
xkejhtidisjwjfnnfnsjrjdnqnhrijchqi
What is the identity of the element that has 19 protons and 22 neutrons?
Answers
Answer:
A titanium ion
A buildup of charges in an object is called
Answers
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.
List two things in your environment that your body would need to adjust to.
Answers
Answer:
oxygen and tempature
Explanation:
find the density of an object that has mass of 5kg and a volume of 50cm3
Answers
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
What medium do selsmic waves travel through?
A
The alr
B
The ground
C
Water
D
Outer space
Answers
Please help. I am putting the rest of my points on this because i need this completed. see attached file
Answers
Answer:
balanced equation of glucose
6CO2 + 6H2O----------C6H12O6 + 6O2
in the presence of sun light.
If you have one mole of a gas at 3.00 atm in a 3.0 L container what is the temperature of the gas?
Answers
Answer:
n = 3.0 moles
V = 60.0 L
T = 400 K
From PV = nRT, you can find P
P = nRT/V = (3.0 mol)(0.0821 L-atm/K-mol)(400 K)/60.0L
P = 1.642 atm = 1.6 atm (to 2 significant figures)
Explanation:
Can someone help me please?
Answers
Answer:
SUN
Explanation:
Hope this helps! Plz mark as brainliest!
And hope it helps
someone help ,, I'll give brainliest lolll .
Answers
Answer:
The last one
Explanation:
NEEED HELPPPP PLEASE
Answers
Answer:
full
Explanation:
What are the combinations attached groups, atoms, or lone pairs you can add to a central atom?
Answers
Answer:
Hello your question is poorly written below is the well written question
Explore what molecules you can build From Lewisstructureandmoleculargeometry . What are the combinations attached groups, atoms, or lone pairs you can add to a central atom?
answer :
when there are three ( 3 ) groups and a lone pair the shape of the molecule will be pyramidal but when the three ( 3 ) groups does not have any lone pair attached to it, the shape of the molecule will be trigonal planarWhen there are two groups and two lone pairs the shape of the molecule will be bent while when there are two groups without lone pairs the shape of the molecule will be linearExplanation:
From molecular Geometry changes there are two groups to be considered here and they are group and lone pairs
The combinations that can be added to a central atom
when there are three ( 3 ) groups and a lone pair the shape of the molecule will be pyramidal but when the three ( 3 ) groups does not have any lone pair attached to it, the shape of the molecule will be trigonal planar
When there are two groups and two lone pairs the shape of the molecule will be bent while when there are two groups without lone pairs the shape of the molecule will be linear
Which of the following describes an exothermic reaction?
Answers
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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How many molecules of NaOH are in 23
moles of NaOH
Answers
Each mole of any substance contain Avogadro’s number of molecules ie., 6.022 x (10 to the power 23).
Hence 3 Moles of NaOH contain 3 times of Avogadro’s number of molecules ie., 3 x 6.022 x (10 to the power 23)
Determine the empirical formula of a compound containing 63.50 % silver, 8.25 % nitrogen, and the remainder oxygen.
Answers
Answe AgNO₃
1:1:3 ratio
Please help with these two I’ll give you brainiest!
Answers
The second question’s answer would be D. In this diagram, the barracuda is at the top of the food chain, therefore, all of the organisms it consumed will increase in size because they no longer have a barracuda preying on them.