Answer:
Explanation:
An isotope is a form of a chemical element whose atomic nucleus contains a specific number of neutron s, in addition to the number of proton s that uniquely defines the element. The nuclei of most atom s contain neutrons as well as protons
In which diagram would the block of wood have the greatest acceleration?
Answer:
The answer is B.
Explanation:
There is more Newton force pushing it and since it's on a flat surface it moves more than a higher kg weight block.
HELP. what are van der waals forces?
Answer: Examples of van der Waals forces include hydrogen bonding, dispersion forces, and dipole-dipole interactions.
Explanation:
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:
What is the chemical formula for ammonium carbonate?
(NH4)2CO3
(NH4)HCO3
NH4(CO3)2
NH4(CO3)
Answer:
(NH4)2CO3
Explanation:
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:
Which is a physical change?
strawberries liquefied in a blender
strawberries cooked into jelly
strawberries left out to mold
Answer: Strawberries liquefied in a blender
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
Elements found in the same period on the periodic table have the same...
Group of answer choices
Number of neutrons
Number of Valence Electrons
Number of Energy Levels
Properties
Answer:
valence electrons
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%
how many molar mass are in BeCl2?
Answer: 79.9182 g/mol
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.
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
how much will 3 moles of Mg(OH)2 weigh?
Answer:
174.9591 Grams mate :) have a good day ily
Explanation:
Which has most likely been peer reviewed?
O an article on the benefits of eating cheese, featured in Crosscreek Dairy Monthly magazine
O an article on the benefits of wearing shoe inserts, featured in Bob's Footwear circular
an article on the beneficial bacteria in yogurt, featured in Medical Journal of Gastroenterology
O an article on beneficial face creams, featured in Beauty and You magazine
Answer:
an article on the beneficial bacteria in yogurt, featured in Medical Journal of Gastroenterology
Explanation:
This article is published in a Medical Journal, which means the contents must be credible, informative, and accurate. In order to be these things, the author most likely had others review their writing to remain objective and ensure quality work. The other articles are not meant to solely inform and are featured in less credible magazines. Therefore, the third option is correct.
Answer:
an article on the beneficial bacteria in yogurt, featured in Medical Journal of Gastroenterology
Explanation:
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.
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 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.
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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How do you know when a phase change happens?
Answer:
phase for what?
Explanation:
Natural disaster that happened in San Angelo ?
Answer:
The National Weather Service
Tornadoes
Explanation:
The National Weather Service
Tornadoes
happen in San Angelo.
Hope this helps
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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8 points
11. Humans have negatively impacted the environment for years. Which
events represent ways humans have harmed the environment. (Choose all
that apply.)
burning fossil fuels
minning
planting trees
using solar power
using fertilizers
recycling
Answer:
Burning fossil fuels
Mining
Using fertilizers
As the temperature of the water increases, what happens to the number of water particles in a mL (cm3)?
!: (a) 20 cm: 80
10. Some mercury is poured into a capillary tube of
uniform bore and one end closed. When the tube
is held horizontally, mercury column has a length
of 4 cm and air enclosed in the closed end has a
length of 10 cm. If the tube is now held vertically,
with open end upwards, the length of the air
column will be (take atmospheric pressure at the
Tale place of experiment to be 760 mm)....
(a) 10.5 cm . (6) 8.5 cm ",JI
(c) 9.0 cm mati (d) 9.5 cm 0
Answer:
THE LENGTH OF THE AIR COLUMN IS 9.5 CM
Explanation:
Taking the atmospheric pressure to be 760 mmHg;
When the capillary tube is held horizontally, the pressure of the tube is 760 mmHg
when the capillary tube is held vertically, the pressure increases by 4 cm = 40 mm
The new pressure of the tube is hence, 760 + 40 mmHg = 800 mmHg
Using the pressure forlmula;
P1 V1 = P2 V2
P1 A1 L1 = P2 A2 L2
where A1 and A2 is the area of the capillary tube and it is equal, it cancels out.
P1 l1 = P2 l2
l2 = P1 l1 / P2
l2 = 760 * 10 / 800
l2 = 9.5 cm
The length of the air in the tube is 9.5 cm.
11. What is the maximum number of electrons that an atomic orbital can contain?
2
32
8
1
Answer:
2
Explanation:
Each orbital can hold two electrons. One spin-up and one spin-down.
According to the unbalanced equation: KCIO3 → KCI + O2 how many
moles of potassium chlorate are needed to produce 6.51 moles of oxygen?
Answer:
06
Explanation:
wht kind of particles contribute to an overall heating effect on climate?
Answer: Aerosols like sulfur, nitrate, and organic carbon are formed in the atmosphere and cause global cooling. Thereby they contribute to mask parts of the human induced global warming. On the other hand, black carbon absorbs radiation and thereby has a warming effect on the earth's climate. -science daily
Explanation: please mark me brainiest. i need one to get a higher rank :/
Answer:
Aerosols like sulfur, nitrate, and organic carbon are formed in the atmosphere and cause global cooling. Thereby they contribute to mask parts of the human induced global warming. On the other hand, black carbon absorbs radiation and thereby has a warming effect on the earth's climate
Explanation:
google hope this helps you
Malik analyzed three samples to test which element was a metalloid. The table shows his results. A 7-column table with 3 rows. The first column titled element has entries A, B, C. The second column titled lustrous has entries yes, no, yes. The third column titled brittle has entries no, yes, yes. The fourth column titled how it reacts has entries base, acid, acid or base. The fifth column titled boiling point (degrees C) has entries not observed, negative 34.04, not observed. The sixth column titled melting point (degrees C) has entries 97.72, not observed, 1413.85. The seventh column titled electrical conductivity has entries high, very low, medium. Which element (A, B, or C) is most likely a metalloid?
Answer:C is most likely a metalloid
Explanation:A is a metal while B is a non metal. This is because when we look at the properties of metals, they are very lustrous and have a high conductivity. On the other hand, non metals are the opposite but metalloids have properties the are inbetween ie, they react with either an acid or base, and have a medium electrical conductivity unlike metals(high) anc non metals(low).
Answer:
Malik analyzed three samples to test which element was a metalloid. The table shows his results.
A 7-column table with 3 rows. The first column titled element has entries A, B, C. The second column titled lustrous has entries yes, no, yes. The third column titled brittle has entries no, yes, yes. The fourth column titled how it reacts has entries base, acid, acid or base. The fifth column titled boiling point (degrees C) has entries not observed, negative 34.04, not observed. The sixth column titled melting point (degrees C) has entries 97.72, not observed, 1413.85. The seventh column titled electrical conductivity has entries high, very low, medium.
Which element (A, B, or C) is most likely a metalloid?
✔C
Explanation:
Edge 2021
What are the positions of the sun, moon, and Earth relative to each other when we have stronger tides?
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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