Answer:fire?
Explanation: it gains heat from heat/friction, and losses it if its been lighted up for too long (it can be used as light)
An aqueous solution of potassium iodide turns from colourless to brown.
What happens to the iodide ions?
A.)lodide ions are oxidised due to gain of electrons
B.)lodide ions are oxidised due to loss of electrons.
C.)lodide ions are reduced due to loss of electrons.
D.)lodide ions are reduced due to gain of electrons.
Answer:B
Explanation:
It’s pretty obvious lol
please help me figure out which has 3 significant figures
Answer:
D
Explanation:
0 is between 6 and 2 so it's also a significant figure
When aqueous solutions of Li3PO4 and MgSO4 are mixed, Mg3(PO4)2 is a precipitate
formed. What is the balanced net ionic equation?
Answer:
Li2SO4
Explanation:
Balance the reaction of Li3PO4 + MgSO4 = Li2SO4 + Mg3(PO4)2 using this chemical equation balancer!
Why does a pair of jeans look blue?
A. It reflects blue light.
O B. It transmits blue light.
O C. It absorbs blue light.
O D. It reflects all colors of light except blue.
Answer:
A
Explanation:
I believe the answer is A. An object is every color except the color we see, or the color that bounces off of said object. Therefore if a carpet is yellow, the carpet is every color but yellow. Yellow is the color that it rejects, bounces off of it, and the one we see.
To solve this we must be knowing each and every concept related to reflections. Therefore, a pair of jeans look blue because it reflects blue light.
What is reflection?In physics, reflection usually described as a change in the orientation of a waveform at the interface of two distinct media, bouncing the waveform back onto the original medium.
The color we perceive is primarily determined by how things interact with lighting as well as finally reflect or transfer it to our eyes. The color we perceive is primarily determined by how things interact with lighting as well as finally reflect or transfer it to our eyes. A pair of jeans look blue because it reflects blue light.
Therefore, a pair of jeans look blue because it reflects blue light.
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For the reaction N2 + 3H2 - 2NH3, how many moles of nitrogen are required to produce 9.58 mol of ammonia?
Answer:
3.193 mol
Explanation:
The reaction is
[tex]N_2+3H_2\rightarrow 2NH_3[/tex]
We use the stoichiometry in order to find the moles of nitrogen required.
[tex]9.58\ \text{mol of }NH_3\times \dfrac{1\ \text{mol of }N_2}{2\ \text{mol of }NH_3}[/tex]
[tex]=3.193\ \text{mol of }N_1[/tex]
The amount of nitrogen required is 3.193 mol to produce 9.58 mol of ammonia.
Draw a number line that represent: it was 29 celculs and it drop down to 16 celculs
Let's take the drop in temperature is - x
expression-> 29-x=16
I have attached the line diagram below.
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How did conservatism affect the nationalist movements in Europe?
A.
It promoted the overthrow of absolute monarchies.
B.
It forced nationalist leaders to adopt socialism.
C.
It delayed or extended nationalist struggles.
D.
It emphasized the rights of individuals over nations.
Answer:
The answer is C. (It delayed or extended nationalist struggles.)
Explanation:
Hope this helps!
A 60.0 g sample of chromium at 82.0°C (specific heat for chromium is 0.11 J/g°C) was placed in 80.0 g of water. Assume there is no loss of heat to the environment. What is the temperature of the water and the chromium? The water's initial temperature was 24.0°C.
The temperature of the water and the chromium : 25.122 ° C
Further explanationThe law of conservation of energy can be applied to heat changes, i.e. the heat received / absorbed is the same as the heat released
Q in(gained) = Q out (lost)
Heat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
Q Chromium= Q water
[tex]\tt 60\times 0.11\times (82-t)=80\times 4.18\times (t-24)\\\\541.2-6.6t=334.4t-8025.6\\\\341t=8566.8\\\\t=25.122^oC[/tex]
write three types of boiling
Answer: Natural Convection Boiling.
Nucleate Boiling.
Transition Boiling.
Explanation:
What did Scientist found that surprised them after making a map of the ocean floor?
a
Subduction
b
Pangea
c
Mid-Ocean ridge
d
Volcanoes
Answer:
C
Explanation:
In 1953 they made soundings and discovered the ocean ridges
In a double bond, two atoms share a total of _____ electrons. a two b three c four d six
Answer:
C: 4
Explanation:
In every single covalent bond, each atom shares one electron. 1 + 1 = 2. A double bond is just two bonds so, 2 x 2 = 4.
I don't know how to transcribe the following DNA sequecne too rna
Answer:
There is only one change when transcribing from a DNA sequence to a RNA sequence.
Explanation:
The change when transcribing is that instead of thymine (T) in a DNA sequence, you have Uracil (U) in a RNA sequence. The rest will stay the same. So, DNA has ATCG, whereas RNA has UACG. There should be NO thymine (T) in your RNA sequence–– it should only include the four of the following: UACG.
[FORMAT]: DNA is to RNA
A is to U (IMPORTANT, NO "T") –– Think as Apples Under the Tree
T is to A –– Think as Trees have Apples
C is to G –– Think as Car in the Garage
G is to C –– Think as Inside the Garage are Cars
How many milliliters of 11.5 m hcl(aq) are needed to prepare 675.0 ml of 1.00 m hcl (aq)?
To prepare a solution of hcl(aq) with a volume of 675.0 ml and a concentration of 1.00 m from a concentrated solution of 11.5 m we need a volume of: 58.69 ml
To solve this problem, the formula and the procedure that we have to use is:
c1 * v1 = c2 * v2
Where:
c1= concentration of the concentrated solutionv1 = volume of the concentrated solutionc2 = concentration of the diluted solutionv2 = volume of the diluted solutionInformation about the problem:
c1 = 11.5 mc2 = 1.00 mv2= 675.0 mlv1=?Applying the dissolution of concentrations formula and clearing the volume of the concentrated solution (v1) we get:
c1 * v1 = c2 * v2
v1 = (c2 * v2)/ c1
v1 = (1.00 m * 675.0 ml)/ 11.5 m
v1 = 58.69 ml
What is a solution?In chemistry a solution is known as a homogeneous mixture of two or more components called:
Solvent: it usually is in a major amount than the soluteSolute: it usually is in less amount than the solventLearn more about chemical solution at: brainly.com/question/13182946
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The ___ is the nations consumer protection agency to help prevent fraud , deception , and unfair business practices .
Answer:
I think it B
Explanation:
Answer:
The answer is FTC or C!!!!!!!!!!!!!!!!!!!!!!!!!!!
Explanation:
3. the atomic radii of mg2 and f− ions are 0.072 and 0.133 nm, respectively. ex 2.2 (a) calculate the force of attraction between these two ions at their equilibrium interionic separation (i.e., when the ions just touch one another).
The force of attraction between these two ions at their equilibrium interionic separation is F = -1.10 x 10⁻⁸.
What is the force of attraction?The force of attraction is when the atoms of two molecules attract one another.
To calculate the attraction (F), we will use Coulomb's Law:
F = k Q1Q2 / r2
where
Q₁ and Q₂ are the fees on the ions,
r is that the distance between them, and
k = the Coulomb constant
Given the Q₁ = 2+
Q₂ = 1-
r₊ = 0.072 nm
r₋ = 0.133 nm
k = 8.988 × 10⁹ N· m²C⁻²
Q₁ = (+2) × 1.602 × 10⁻¹⁹ C
= +3.204 × 10⁻¹⁹ C
Q₂ = (-1) × 1.602 × 10⁻¹⁹ C
= -1.602 × 10⁻¹⁹ C
r = r₊ + r₋
0.072 nm + 0.133 nm = 0.205 nm
= 0.205 × 10⁻⁹ m
F = -1.10 x 10⁻⁸
Thus, the force of attraction is F = -1.10 x 10⁻⁸.
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I need help urgently see where it says text here answers the questions PLS I NEED AN 100%
Based on the properties of elements, atoms, compounds and mixtures:
Part 1:
There are four protons in the atomThere are two electrons in the atom.There are five neutrons in the atomThe atom has a negative chargePart 2: Oxygen
The atomic number is the number of protonsThe atomic mass represents the sum of the mass of the proton and neutronPart 3:
Pure element = CMixture of element & compound = DPure compound = BMixture of two compounds = AWhat are elements, atoms, compounds and mixtures?Elements are pure substances which cannot be split into simpler substances by an ordinary chemical process.
Atoms are the smallest particle of elements that can take part in a chemical reaction.
Compounds are substances composed of two or more elements chemically combined together
Mixtures are substances composed of two or more constituents physically combined together.
Considering the given questions:
How many protons are in this atom? There are four protons in the atomHow many electrons are in this atom? There are two electrons in the atom.How many neutrons are in this atom? There are five neutrons in the atomDoes this atom have a positive, negative, or neutral charge? The atom has a negative charge as it has lost two electrons.Oxygen 15.999
What does the atomic number represent? The atomic number is the number of protonsWhat does the atomic mass represent? The atomic mass represents the sum of the mass of the proton and neutronThe correct matches are:
Pure element = CMixture of element & compound = DPure compound = BMixture of two compounds = ALearn more about elements, compounds and mixtures at: https://brainly.com/question/519068
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what two ways do nuclear power reactors harm the enviornment
Is potassium transparent
Answer:
some potassium can be
Explanation:
What is the Cp (in J/gC) of a material if a 50 gram sample of it at 100 C is placed into 500 grams of water at
20 C and the water temp rises to 23 C and the material temp goes down to 23 C?
Answer:
The specific heat capacity of this material is approximately [tex]1.6\; \rm J\cdot g^{-1} \cdot {\left(^\circ C\right)}^{-1}[/tex].
(Assume that there is no energy loss. Assume that the specific heat capacity of water is [tex]4.182\; \rm J \cdot g^{-1} \cdot {\left(^\circ C\right)}^{-1}[/tex].)
Explanation:
Let [tex]c[/tex] denote the specific heat capacity of a material. Consider a sample of that material with mass [tex]m[/tex]. If the temperature of that objects changes by [tex]\Delta T[/tex], the corresponding energy change would be [tex]Q =c \cdot m \cdot \Delta T[/tex].
Start by finding the amount of energy that water has gained from the [tex]50\; \rm g[/tex] sample.
Specific heat capacity of water: [tex]c(\text{water}) \approx 4.182\; \rm J \cdot g^{-1} \cdot \left(^\circ C\right)^{-1}[/tex].Mass of water: [tex]m(\text{water}) = 500\; \rm g[/tex].Temperature change: [tex]\begin{aligned}\Delta T(\text{water}) &= T(\text{final}) - T(\text{initial}) \\ &= 23\; \rm ^\circ C - 20\; \rm ^\circ C = 3\; \rm ^\circ C\end{aligned}[/tex].That [tex]500\; \rm g[/tex] of water would have gained:
[tex]\begin{aligned} & Q(\text{water}) \\ &= c(\text{water}) \cdot m(\text{water}) \cdot \Delta T (\text{water}) \\ &\approx 4.182\; \rm J \cdot g^{-1} \cdot \left(^\circ C\right)^{-1} \times 500\; \rm g \times 3\; \rm ^\circ C \\ &\approx 6.27\times 10^{3}\; \rm J \end{aligned}[/tex].
Assume that the [tex]50\; \rm g[/tex] sample and the [tex]500\; \rm g[/tex] of water were insulated from the surroundings. The energy that water gained would be exactly the same as the energy that the [tex]50\; \rm g\![/tex] sample had released through cooling.
In other words, the [tex]50\; \rm g[/tex] sample has released approximately [tex]6.27 \times 10^{3}\; \rm J[/tex] of energy as it is cooled from [tex]100\; \rm ^\circ C[/tex] to [tex]23\; \rm ^\circ C[/tex].
Energy change: [tex]Q(\text{sample}) \approx -6.27 \times 10^{3}\; \rm J[/tex] (negative because this sample has lost energy through cooling.)Mass of sample: [tex]m = 50\; \rm g[/tex].Temperature change: [tex]\begin{aligned}\Delta T(\text{sample}) &= T(\text{final}) - T(\text{initial}) \\ &= 23\; \rm ^\circ C - 100\; \rm ^\circ C = -77\; \rm ^\circ C\end{aligned}[/tex].Rearrange the equation [tex]Q = c \cdot m \cdot \Delta T[/tex] to find an expression for specific heat capacity, [tex]c[/tex]:
[tex]\begin{aligned}c = \frac{Q}{m \cdot \Delta T}\end{aligned}[/tex].
Apply this expression to find the specific heat capacity of the sample:
[tex]\begin{aligned}c(\text{sample}) &= \frac{Q(\text{sample})}{m(\text{sample}) \cdot \Delta T(\text{sample})} \\ &\approx \frac{-6.27\times 10^{3}\; \rm J}{50\; \rm g \times \left(-77\; \rm ^\circ C\right)} \approx 1.6\; \rm J \cdot g^{-1} \cdot {\left(^\circ C\right)}^{-1}\end{aligned}[/tex].
Can someone write a speech about Chemistry. plzzzz help
Answer:
Chemistry is the scientific discipline involved with elements and compounds composed of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances.
n the scope of its subject, chemistry occupies an intermediate position between physics and biology.[5] It is sometimes called the central science because it provides a foundation for understanding both basic and applied scientific disciplines at a fundamental level.[6] For example, chemistry explains aspects of plant chemistry (botany), the formation of igneous rocks (geology), how atmospheric ozone is formed and how environmental pollutants are degraded (ecology), the properties of the soil on the moon (cosmochemistry), how medications work (pharmacology), and how to collect DNA evidence at a crime scene (forensics).
Chemistry addresses topics such as how atoms and molecules interact via chemical bonds to form new chemical compounds. There are two types of chemical bonds: 1. Primary Chemical bonds e.g covalent bonds, in which atoms share one or more electron(s); ionic bonds, in which an atom donates one or more electrons to another atom to produce ions (cations and anions); Metallic bonds and 2. Secondary chemical bonds e.g. hydrogen bonds;Van der Waals force bonds, ion-ion interaction, ion-dipole interaction etc.
Explanation:
need thanks and make me brainiest if it helps you
Which of the following best describes a meridian of longitude?
A line that is drawn horizontally around the earth and is parallel to the Prime Meridian.
A line that is drawn vertically down the earth and is parallel to the equator.
A line that is drawn vertically down the earth but is NOT parallel to the Prime Meridian.
A line that is drawn horizontally around the earth and is parallel to the equator.
Answer:
A line that is drawn vertically down the earth but is not parallel to the prime Meridian.
Explanation:
A line that is drawn vertically down the earth but is NOT parallel to the Prime Meridian, best describes the meridian of longitude.
What is prime meridian?Prime Meridian is an imaginary line which divides the earth into eastern and western hemispheres
What do you mean by meridian of longitude?Meridian of longitude is an imaginary semicircle that runs from north to south direction and joins the two poles. All meridians are of the same length and meet at the poles.
Hence, option 3 is the answer.
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If the density of hydrochloric acid is 1.49 g/mL , what is the volume of 3.5 g of hydrochloric acid
The volume of 3.5g of hydrochloric acid that has a density of 1.49 g/mL is 2.35mL.
How to calculate volume?Density is a measure of the mass of matter contained by a unit volume. The density of a substance can be calculated by dividing the mass of the substance by its volume as follows:
Density = mass ÷ volume
According to this question, 3.5g of hydrochloric acid has a density of 1.49 g/mL. The volume contained in this mass of hydrochloric acid can be calculated as follows:
1.49g/mL = 3.5g ÷ V
V = 3.5 ÷ 1.49
V = 2.35mL
Therefore, the volume of 3.5g of hydrochloric acid that has a density of 1.49 g/mL is 2.35mL.
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H2 + O2 -> 2H2O
balanced or unbalanced pls help
Answer:
Unbalanced
Explanation:
The reaction equation is given as:
H₂ + O₂ → 2H₂O
The given reaction flouts the law of conservation of mass and it is not balanced. To know a reaction that is balanced, the number of atoms on both sides of the expression must be the same;
Number of moles
Reactants Products
Hydrogen 2 4
Oxygen 2 2
We see that the hydrogen atoms are not balanced.
Which of the following is evidence that groundwater cause erosion and deposition
Answer:You didn't provide examples
Explanation: Groundwater can cause erosion under the surface as it moves through the soil. During the movement an acid is formed which what causes erosion and deposition.
Hope that helps
how many electrons are in krypton
Answer: 36
Explanation:
How many Barium would there be in the formula of Barium lodide
Answer: one barium atom and two iodine atoms are present in barium iodide
Explanation:
BaI2 is formula of barium iodide
A child on a high dive has a mass of 40 kilograms. If the high dive is 10 meters in the air, what is the potential energy?
3920 Joules
400 Joules
4 Joules
Answer:
3920 JoulesExplanation:
The potential energy of a body can be found by using the formula
PE = mgh
where
m is the mass
h is the height
g is the acceleration due to gravity which is 9.8 m/s²
From the question we have
PE = 40 × 9.8 × 10
We have the final answer as
3920 JHope this helps you
Which has more thermal energy: 5 grams of water at 50 °C or 500 grams of water at 50 °C?
Explain your answer.
Answer:
500 grams
Explanation:
its because it has more water. The amount of thermal energy available in a substance is proportional to the mass of the substance.
Need help with these.
I have no idea what is what
Answer:
The first one would be C. The second one would be E. The third one would be B. The fourth one would be D. Lastly, the fifth one would be A.