Help! 7th grade science!
When her lab partner takes out a graduated cylinder to pour a specific amount of liquid, Jocelyn reminds her to be careful for the curve at the top of the liquid. This curve is also known as the
A
stopper.
B
meniscus.
C
beam.
D
Erlenmeyer.
The curve in the given scenario is known as the meniscus. The correct option is B.
What is a graduated cylinder?A graduated cylinder, also known as a measuring cylinder or mixing cylinder, is a piece of laboratory equipment that is commonly used to measure the volume of a liquid.
It is narrow and cylindrical in shape. The amount of liquid measured is represented by each marked line on the graduated cylinder.
A graduated cylinder is a piece of laboratory equipment used to measure the volume of liquids, chemicals, or solutions during the course of a day's work in the lab.
Graduated cylinders provide greater precision and accuracy than standard laboratory flasks and beakers.
The upward or downward curve seen at the top of a liquid in a container is known as the meniscus.
Thus, the correct option is B.
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DESCRIBE HOW BALANCING AN EQUATION IS SIMILAR TO COOKING.
name three pure elements and three pure compounds
Answer:
Pure elements:
Hydrogen(H)
Nitrogen(N)
Magnesium (Mg)
Pure Compounds:
Oxygen gas(O2)
Water (H2O)
Ammonia (NH3)
Explanation:
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complete the bolded items in each box below
Show the bolded items and the boxes.
Give 1 example of each.
Kinetic , Gravitational Potential , Chemical , Sound , & Radiant energy.
bullet fired from a gun
falling apple from tree
stone at a height
rusting of iron
loud speaker
How many grams of NaOH would be required to make 1.0 L of a 1.5 M solution
What is the pH of 0.00765 KOH?
What are the units for the measurements of radioactive element activity?
Answer:
Bq
Explanation:
The number of decays per second, or activity, from a sample of radioactive nuclei is measured in becquerel (Bq), after Henri Becquerel. One decay per second equals one becquerel.
The radioactive decay has been measured as decay per second by becquerel (Bq).
Radioactive decay has been given as the loss of energy by the nucleus. The release of energy has been in the form of radiation. The varying energy radiations have been termed alpha decay, beta decay, gamma decay.
The decay has been performed by unstable nuclei with the emission of multiple particles. The decay unit has been given by Henri Becquerel. The unit has been the determination of the decay performed per second and has been given by becquerel (Bq).
Thus, the unit for the measurement of radioactive decay has been becquerel (Bq).
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the main source of nitrous oxide by humans is
Explanation:
Human activities such as agriculture, fuel combustion, wastewater management, and industrial processes are increasing the amount of N2O in the atmosphere. Nitrous oxide is also naturally present in the atmosphere as part of the Earth's nitrogen cycle, and has a variety of natural sources.
Does axons have insulation
Answer: Yes they do;
Explanation:
Axons, the long projections of neural cells that make up our peripheral nervous system's nerves, are comparable to power wires in that they have dense electrical insulation and can easily transmit impulses from the body and signals from the brain to a toe, for example.
Why does it seem that the sun is rising and setting in the sky?
Answer:
Because of the earths rotation
Explanation:
But it appears to rise and set because of the Earth's rotation on its axis. It makes one complete turn every 24 hours. ... As the Earth rotates toward the east, it looks like the sun is moving west. As the Earth rotates, different locations on Earth pass through the sun's light.
Answer:
When the earth is rotating, it is rotating away and towards the sun which is why we have day and night
Explanation:
What is the total number of orbitals that can be found on third electron shell (n=3)? Answer with explanation
Answer:
nine orbitals
Explanation:
There are nine orbitals in the n = 3 shell. There is one orbital in the 3s subshell and three orbitals in the 3p subshell. The n = 3 shell, however, also includes 3d orbitals.
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Answer: The value of [tex]K_c[/tex] is 2
Explanation:
Moles of [tex]N_2O_4[/tex] = 1.0 mole
Volume of solution = 1.00 L
Initial concentration of [tex]N_2O_4[/tex] = [tex]\frac{1.0mol}{1.00L}=1.0M[/tex]
Equilibrium concentration of [tex]NO_2[/tex] = [tex]\frac{1.0mol}{1.00L}=1.0M[/tex]
The given balanced equilibrium reaction is,
[tex]N_2O_4(g)\rightleftharpoons 2NO_2(g)[/tex]
Initial conc. 1.0 M 0 M
At eqm. conc. (1.0-x) M (2x) M
The expression for equilibrium constant for this reaction will be,
[tex]K_c=\frac{[NO_2]^2}{[N_2O_4]}[/tex]
Given : 2x = 1.0
x= 0.5
Now put all the given values in this expression, we get :
[tex]K_c=\frac{(1.0)^2}{(1.0-0.5)}[/tex]
[tex]K_c=2[/tex]
Thus the value of [tex]K_c[/tex] is 2
Organisms in the kingdom Fungi are often compared to plants. Choose ALL the characteristics that would differentiate fungi from plants.
Answer:
b and d
Explanation:
Fungi rely on other organisms for their nourishment whereas plants have chlorophyll and can manufacture it on their own. Therefore, there is large difference between plants and fungi.
What is fungi?The kingdom of fungi (plural: fungus) includes heterotrophic (unable to produce their own food) multicellular eukaryotic creatures that play significant roles in the nutrient cycle in ecosystems.
Fungi reproduce by spores, whereas plants reproduce via seeds and pollen. Plants have stems, leaves, and roots. Only the filaments that adhere to the host are found in fungi. In the eco system, plants are the producers, and fungus are the decomposers. Plant cell walls are composed of cellulose, whereas fungi's are composed of chitin.
Therefore, there is large difference between plants and fungi.
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Why is copper a good conductor of electricity?
A.
Copper atoms hold onto their electrons very tightly.
B.
Electrons can move easily between copper atoms.
C.
Copper atoms are bonded together in molecules.
D.
Copper atoms can flow quickly along a wire.
Answer:
B. Electrons can move easily between copper atoms.
Explanation:
Look at the images of Mars below. choose three features from the images and explain why they provide evidence thatt there is or was water on Mars. NEED HELP ASAP. (Will mark Brainlist)
Answer:
Spot (4) Has evidence that there were waves here at some point. It looks as if the sand/surface debris was moved back and forth, creating this pattern in the sand. Spots (5) and (7) show evidence of water erosion. The smooth edges of both hills mean that water once flowed through that area, carrying little pebbles and rocks that gradually shaped and smoothed those mounds. An example for this would be how there are smooth areas in the Grand Canyon where scientists have concluded that some, if not all, of the Grand Canyon was formed by flowing water. "Rapid uplift, cracking, and surface drainage of receding floodwaters provide both the path and the necessary volume of water to quickly carve out Grand Canyon," says scholars on icr.org.
Explanation:
Water Erosion exists.
why are chemical equations balanced? PLEASE HELP
Answer:
A to show that the mass of atoms in the product
How many grams of CO 2 are present in a container with a volume of 5.61 L if the gas exhibits a pressure of 5.66 atm at a temperature of 311 K?
Answer:
54.72 g
Explanation:
Mass = ?
Volume = 5.61 L
Pressure = 5.66 atm
Temperature = 311 K
The relationship between these equations is given by the ideal gas equation;
PV = nRT
where R = gas constant = 0.0821 atm L K-1 mol-1
n = PV / RT
n = 5.66 * 5.61 / (0.0821 * 311 )
n = 1.2436 mol
Number of moles = Mass / Molar mass
Mass = Number of moles * Molar mass = 1.2436 * 44 = 54.72 g
How many molecules of CrCl₃ are produced when 2.89 moles of CuCl₂ react? *
2Cr+3CuCI2-2CrCI3+3Cu
Explanation:
The reaction is CaCO
3
+2HCl→CaCl
2
+H
2
O+CO
2
.
Thus, 2 moles of HCl reacts with one mole of calcium carbonate to produce one mole each of calcium chloride, water and carbon dioxide respectively.
Hence, 3 moles of HCl will react with excess of calcium carbonate to produce 3×
2
1
=1.5 mol of carbon dioxide
Solar energy converts ___ into either ___ energy or electrical energy.
electromagnetic, thermal
electromagnetic, potential
thermal, nuclear
chemical, thermal
Answer:
Hey mate....
Explanation:
This is ur answer.....
Solar radiation can be converted either into thermal energy (heat) or into electrical energy.Hope it helps!
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Which separation techniques will you apply for the separation of the following? a) oil from water b) kerosene and petrol c) salt from sea water d) camphor from salt ii). State the principle of chromatography.
Answer:
A) Separating funnel method
B) Simple Distillation
C) Evaporation
D) Sublimation
E) It is based on the principle of separation whereby even though two substances are dissolved in the same solvent, their respective solubilities could be different. Thus, the component that has more solubility will rise fastest and will therefore get separated from the mixture.
Explanation:
A)
B) Kerosene and petrol are both miscible liquids and the difference in their boiling point temperature is not more than 25°C. Thus, we make use of Simple distillation.
C) Can be separated by evaporation where the water is boiled and it evaporates and leaves the salt behind
D) To separate camphor from salt, we use sublimation so the camphor can change directly from solid to the gas state without passing through the liquid state.
E) Chromatography is used to separate components of a mixture.
It is based on the principle of separation whereby even though two substances are dissolved in the same solvent, their respective solubilities could be different. Thus, the component that has more solubility will rise fastest and will therefore get separated from the mixture.
A woman uses 330 Joules of energy to push a box across the floor in 33 seconds. What is her power output in Watts?
Answer:
10 watts
Explanation:
Power = Work / Time
Power = 330 J / 33 s
Power = 10 watts
how many electrons will be in the valence of non- H atoms when they make covalent bonds?
Answer:
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A force of 25 newtons is exerted over an area of 50 square meters. Calculate
the pressure exerted in pascals.
Answer:
the pressure exerted in pascals is 0.5 Pa
Explanation:
The computation of the pressure exerted in pascals is shown below:
As we know that
Pressure = force ÷ area
= 25 ÷ 50
= 0.5 Pa
Hence, the pressure exerted in pascals is 0.5 Pa
We simply applied the above formula so that the correct pressure could come
I need help with this please
Answer:
raising the Concentration of liquid
raise the temperature of the system
bubbles of hydrogen gas
5. Calculate the mass in grams of 1.88 x 1024 particles of CO2?
Answer:
137.44g CO2
Explanation:
(1.88 × 10²⁴ / 6.02 × 10²³) × (16 + 16 + 12.01) = 137.44g
A single 250 gram
serving of one sports drink contains
0.055 grams of sodium ions. What is the
concentration of sodium ions expressed
as % by mass?
2.2 x 10-4
2.2 x 102
2.2 x 10-2
2.2 x 10-4
2.2 x 10^-2
0.055 / 250 = 0.00022 - This would be 2.2 x 10^-4, but the question is asking for percent, not proportion, so multiply by 100% to get the percentage.
0.00022 * 100% = 0.022% = 2.2 * 10^-2
What is the lanthanide with least mass, periodic table?
Answer:
Europium/Eu ( not really sure )
The lanthanide element with the least mass is Lutetium (Lu)
Lutetium (Lu) is a member of the lanthanide series, which is a group of 15 elements located in the f-block of the periodic table. The lanthanide series starts with the element Lanthanum (La) and ends with Lutetium (Lu). Lutetium is the heaviest and most dense element in the lanthanide series. Lutetium has an atomic number of 71, indicating that it has 71 protons in its nucleus. It has a relatively high atomic mass of approximately 174.97 atomic mass units (u) according to the periodic table.
Hence, lutetium is the lanthanide element with the least mass.
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Why does nobody fking answer my questions.
How did stromatolites contribute oxygen to the early atmosphere?
through methane degradation
through photolysis
by weathering of rocks
through photosynthesis
Answer:
by wearing of rocks
Explanation:
earths gravity your welcome
Answer:
weathering of rocks is the answer to your question
help meeeee
I require someone WITH braincells
22 How does Earth's tilt affect climate?
OA. smaller the tilt, the warmer the summer.
OB. The smaller the tilt, the smaller the temperature difference is between summer and winter.
OC. The larger the tilt, the warmer the summer.
OD. The larger the tilt, the smaller the temperature difference is between summer and winter.