Answer:
chemical energy is stored in the wood before combustion.
What are the positions of the sun, moon, and Earth relative to each other when we have stronger tides?
As the temperature of the water increases, what happens to the number of water particles in a mL (cm3)?
What is the chemical formula for ammonium carbonate?
(NH4)2CO3
(NH4)HCO3
NH4(CO3)2
NH4(CO3)
Answer:
(NH4)2CO3
Explanation:
calculate the percent solute of 1.4g of NaCl in 46.6g of saline solution
Answer:
3.0%
Explanation:
A solution's mass percent concentration, (% m/m), is calculated by observing the mass of solute in grams of obtained in each 100 g of solution. In simple terms, the solution's mass percent concentration is given by the number of parts of solute obtained in every 100 parts of solution, made up of solute and solvent.
Hence the percent m/m concentration of a solution is obtained as;
Mass of solute/ mass of solution × 100/1
From the question, we have,
Mass of solute= 1.4g
Mass of solution= 46.6 g
Therefore, percent m/m concentration of the saline solution=
1.4/46.6 ×100/1 = 3.0%
The percent solute concentration of the solution is 3.0%
what tool do you have to use to find the mass of a small pumpkin? A beaker B balance C stopwatch D meter stick E thermometer F graduated cylinder
Answer: Balance (B.)
Explanation:
Balances are used to measure mass.
Beakers and graduated cylinders measure volume. Stopwatches measure time. Meter sticks measure length. Thermometers measure temperature.
2. Which ecoregions are most likely to experience a drought or heatwave?
a. West Texas Ecoregions
b. Central Texas & Panhandle Ecoregions
c East Texas Ecoregions
d. Coastal Ecoregions
Answer: A--- West Texas Ecoregions.
Explanation:
The West Texas Eco regions are high plains characterized with dry flat land which receives lowest amount of rainfall thereby having very short grass vegetation. this flat land has a leveled plateau which ranges from about 3000 to 4500 ft and receives the highest winds due to its nature.
Because It is a dry region, it is prone to heatwaves and drought.
Someone can help me whit this? I have the whole document too.
Answer:
1a. Metalloids have properties that are between metals and non-metals, they are alo known as semi-metals.
b.) The yellow border consisting of silicon, boron, Ge As, etc., are metalloid elements
2a.) Non-metals are on the right side of the periodic table.
B.) Non-metals have poor conductivity, are not malleable or ductile, are not sonorous. They are basically the opposite of metals.
Which is a characteristic of the polar water molecule?
.
a tetrahedral electron domain geometry with covalently bonded atoms
a tetrahedral electron domain geometry with ionically bonded atoms
a linear shape with polar covalent bonds
a linear shape with polar ionic bonds
Answer:
A tetrahedral electron domain geometry with covalent bonded atoms.
Consider the nuclear equation below. Superscript 235 subscript 92 upper U right arrow superscript 4 subscript 2 upper H e. What is the nuclide symbol of X? Superscript 231 subscript 94 upper P u. Superscript 235 subscript 90 upper T h. Superscript 239 subscript 94 upper P u. Superscript 231 subscript 90 upper T h.
Answer:
[tex]\rm_{90}^{231}\text{Th}[/tex]
Explanation:
The unbalanced nuclear equation is
[tex]\rm _{92}^{235}\text{U} \longrightarrow \, _{2}^{4}\text{He} + X[/tex]
Let's write X as a nuclear symbol.
[tex]\rm _{92}^{235}\text{U} \longrightarrow \, _{2}^{4}\text{He} + _{Z}^{A}\text{X}[/tex]
The main point to remember in balancing nuclear equations is that the sums of the superscripts and of the subscripts must be the same on each side of the reaction arrow.
Then
235 = 4 + A , so A = 235 - 4 = 231, and
92 = 2 + Z , so Z = 92 - 2 = 90
And your nuclear equation becomes
[tex]\rm _{92}^{235}\text{U} \longrightarrow \, _{2}^{4}\text{He} +\, _{90}^{231}\text{X}[/tex]
Element 90 is thorium, so
[tex]\rm X = _{90}^{231}\text{Th}[/tex]
Answer:
its d
Explanation:
edg
2. Explain why carbon dioxide in the atmosphere is increasing.
3. Describe one explanation for why Earth’s climate is becoming warmer.
4. Analyze the factors that have limited the effectiveness of the Kyoto Protocol.
Answer: Carbon dioxide concentrations are rising mostly because of the fossil fuels that people are burning for energy.
(1)Extra greenhouse gases in our atmosphere are the main reason that Earth is getting warmer.
(2)Greenhouse gases, such as carbon dioxide (CO2) and methane, trap the Sun's heat in Earth's atmosphere.
(3)It says that the 1997 Kyoto Protocol was an unmitigated success, with every single one of the 36 countries that signed up reducing their mean annual greenhouse gas emissions from 2008-2012 by an average of 5% relative to the levels seen in 1990.Jun 15, 2016 Many argue that Kyoto's failure is due to deficiencies in the structure of the agreement, such as the exemption of developing countries from reductions requirements, or the lack of an effective emissions trading scheme.by 2012
Explanation:
The entire constellation of Orion is visible in the night sky in January to an observer in New York State which statement explains why the constellation is not visible in the night sky to this observer in June
A)Earth rotates on its axis
B)earth revolves around the sun
C)the constellation Orion orbits around the sun
D)the tilt of earths axis changes through the year
Answer:B
Explanation:
The constellation is not visible in the night sky to this observer in June because: B) Earth revolves around the Sun.
Earth revolution can be defined as the complete motion (movement) of Earth along a path (orbit) around the Sun or the Moon.
Based on Astronomy, it takes the Earth 365 1/4 days to completely move around the Sun.
Due to Earth's revolution around the Sun on a tilted axis, the following observations and events take place:
The visibility of different constellations in the night sky at different times of the year.Changes in season.The traveling of vertical ray of the Sun from 23.5° North to 23.5° South.During summer such as in the month of June, the constellation of Orion is only visible in the sky at day time but not in the night due to Earth's revolution around the Sun.
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When water vapor is cooled, it re-forms into water droplets. Why does this represent a conservation in mass?
50 POINTS!!!
Answer:
People, especially kids, tend to think that when water evaporates it just disappears, or turns into the air. But we know based on the law of conservation of mass that any time water changes state it keeps the same mass!
Similarly, when water vapor turns to water droplets, when it goes from its gas to its liquid state, it still has the same mass. It's just in a different phase. This is a perfect example of conservation in mass!
Write the symbol for the ion with 68 electrons, 72 protons, and 106 neutrons.
Answer:
I think it should be Hafnium which is Hf.
indicators are chemicals that change colour in presence of an acid or an alkali. Universal indicators and pH meters are used to measure pH. Desccribe how you would use a universal indicator to find the pH of sodium hydroxide. What colour change would you observe
Answer:
Purple. Sodium Hydroxide is an Alkali/base. Bases and Alkalis
have a pH greater than 7, and turn blue-purple in universal
indicator.
Explanation:
if i have about 68.2 grams of H2S, how many moles do i have?
Answer:
2.1 mol
Explanation:
68.1g / 34.1 g/mol = 2.1mol
Where are most insect eggs laid on a corpse? *
A)On the head only.
B)Under the corpse.
C)Only on exposed skin
D)Body openings/wounds
Answer: usually D (but it could also be C)
Explanation:
Pls help me on this question????
Explanation:
The first one is series circuit as it is joined one after another while the second one is parallel circuit joined in a parallel way. Ok the line just like this --------- is the wire , the sign like this | | is the battery and the circles with cross are the bulbs
Hope this helps :) Have a great day
11. What is the mass number
of an element if its atom
contains 10 protons, 10
electron, and 12 neutrons?
A 12
C20
D. 32
Answer:The mass numbr is 22
Explanation:
Mass number=number of protons+ number of neutrons....which is 10+12=22
What is the difference between endothermic reactions and exothermic reactions? (Please describe both types of chemical reactions.)
Answer:
Explanation:
Endothermic reactions absorb energy from the surrounding, but exothermic reactions release energy to the surrounding.
What is one way engineers have used a material like oobleck to help people?
Answer:
Oobleck has been used to manufacture shoes, filling of portholes, making bullet proof vest.
Explanation:
Oobleck is a non Newtonian fluid which is made from mixture of cornstarch and water. It has both liquid and solid properties. Its act like a liquid when is poured and as a solid when a force act on it. It is a substance that is use in manufacturing shoes. The inside layer of shoes is made of it. It's viscosity increases when there is shear stress. It is use for filling portholes
Answer:
The research could enhance protection of police and soldiers and create softer robots. This cornstarch and water mixture, known as “oobleck,” is a shear thickening liquid that can rapidly switch between a liquid-like and a solid-like state in response to externally applied stress.
Explanation:
Grains of sugar dissolve more quickly in tea than do sugar cubes. Which answer correctly describes why this occurs?
The sugar grains form a saturated solution.
The sugar cube is already at equilibrium.
The sugar grains have a greater surface area.
The sugar cube is at great pressure.
Answer:
sugar cube is at great pressure
Explanation:
this is because great pressure means its more solid
What amount of moles does 60.5 L of carbon dioxide occupy at 2.15 atm and 25 degrees C?
4.3 moles
5.3 moles
9.3 moles
2.5 moles
Answer: 5.3 moles
Explanation:
Hi, to answer this question we have to apply the next formula:
n = PV/RT
Where:
n = number of moles
P= Pressure = 2.15 atm
V= volume = 60.5 L
R = 0.0821 atm(L)/mol(K)
T = temperature = 25 °+ 273.15 = 298.15 Kelvin
Replacing with the values given:
n = 2.15 (60.5) / 0.0821 (298.15) = 5.3 moles.
Feel free to ask for more if needed or if you did not understand something.
How do you know when a phase change happens?
Answer:
phase for what?
Explanation:
please answer ASAP which of the following represents gamma emission? picture attached
Answer:
The answer is A.
Explanation:
A P E X
Gamma radiation arises from the radioactive decay of the nuclei along with the release of γ. The reaction of the Technetium (Tc) element represents the gamma decay. Thus, option A is correct.
What is gamma decay?Gamma packets are the energy packets released in the radioactive decay reaction where the particle undergoing decay does not have a change in the number of protons or neutrons but instead moves the nucleus from higher to lower energy levels. The gamma emission is depicted by,
⁹⁰Tc₄₃ → ⁹⁰Tc₄₃ + γ
In the gamma decay of the Technetium element, the nucleus from the higher energy lowers and produces the same elements along with a gamma photon.
In gamma decay, the unstable nuclei dissipate energy in the form of gamma rays or photons. In this type of radioactive decay, the element in the reactant and the product are the same.
Therefore, a reaction involving Tc is an example of gamma emission.
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A blacksmith making a tool heats 525 grams of steel to 1230°C. After hammering the steel, she places it into a bucket of water to cool it. When
she removes the steel from the water, it's at 50°C. How much heat does the steel release if its specific heat capacity is 0.486 Joules/gram degree
Celslus?
A. 301,000 Joules
B. 12,800 Joules
C. 1,270 joules
D. 241 Joules
E. 4.62 joules
The heat energy released here can be determines using calorimetric equation. The heat energy released by the steel is 301077 J. Hence, option A is correct.
What is calorimetry ?Calorimetry is an analytical technique used to determine the heat energy absorbed or released by a system. The calorimetric equation connecting the heat energy with the mass m, specific heat capacity of the substance c and the temperature difference ΔT is given below:
q = m c ΔT.
given ,
mass of the steel m = 1230 °C
c for steel = 0.486 J/g °C
ΔT = 1230 - 50 °C = 1180 °C.
Then, the heat energy released by the steel into water is determined as follows:
q = 1180 °C × 525 g × 0.486 J/g °C
= 301077 J.
Therefore, the heat energy released by the steel is 301077 J.
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You are shown a liquid that looks the same throughout. You are told it contains more then one element in varying proportions. Is the liquid an element, a compound or a mixture? Give a reason why.
Answer:
It is a mixture
Explanation:
An element comprises of a single type which exists on its own.
A compound comprises of two or more which are bonded together chemically
A mixture comprises of different substances which are combined physically.
Determine the size of the heavy particle using the simulation tools and then relate molecule size to something you are familiar with. A common way to relate two things is to say something like: 1000 particles of sand fit in the palm of your hand. Show your calculations with the units clearly labeled.
Answer:
Explanation:
This can be determined in as represented in the three (3) steps below.
1. Movement of heavy and light particles
Note that both the particles are trying to occupy the maximum room, by having constant elastic collision with the boundary and each other, thereby following brownian motion
Also note that heavy particles travel slowly and lighter ones travel faster
Increasing temperature will increase the speed of the particles in the chamber and will also increase the pressure inside the chamber
Hence, ideal gas mixtures occur following ideal gas laws, like a mixture of CO₂ ( heavy gas) with H₂ ( lighter gas)
2. Measuring the length of the chamber by ruler, we have l = 6.6 mm
time taken by heavy molecule at 570 k, t = 11.63×10⁻¹² s [ using stop watch]
so, speed of molecule = 567.49 m/s
3. Therefore, at 2.8 atm pressure, 277 K temperature, 989 heavy particles of gas are there
This is gotten as the relative size of the molecules
Imagine that hotter magma is lying beneath an area of cooler magma deep in the mantle. What do you predict will happen?
Answer:
it will explod because off all of the prussere but on to it.
Explanation:
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Titanium will react with magnesium oxide but sodium reacts with titanium oxide.
The position of titanium will be
a. above sodium
b. .below magnesium but above iron
c. below sodium but above magnesium
d.. below silver
Answer:
below sodium but above magnesium
Explanation:
It is necessary to note that only a metal that is above another metal in the activity series can displace it from its compound.
The first statement said that titanium reacts with magnesium oxide. The implication of this is that titanium can displace magnesium from its oxide. This is only possible if titanium is above magnesium in the activity series.
The second statement says that sodium reacts with titanium oxide. This implies that sodium metal can displace titanium from its oxide. For this to occur, then sodium must be above titanium in the activity series of metals. Hence the answer above.