Answer:
c
Explanation:
what is the same between mass and weight
Answer:
Mass is how much matter an object has. Weight is how much gravity an object is being acted upon.
Explanation:
The mass of an object will stay the same no matter where you place it. But if you were to place the object, in the moon for example, then the weight of the object would be less since there is less gravity on the moon.
How many atoms are there in 2 moles of helium?
Answer:
1 mole Of Helium = Weight of Helium/4Weight of Helium = 1*4 = 4 grams 1 mole of Helium contains 6.023*10²³ ( Avogadro number) atoms. Number of moles of in 4 grams of Hydrogen 4 grams is = given weight / molecular weight of Hydrogen (H₂) = 4/2 =2 Number of atoms/molecules in 2 moles of Hydrogen is (2*6.023*10²³) atoms. = 12.046*10²³ atoms.
(Hope this helps)
The number of atoms in 2 moles of helium is 1.204×10²⁴ atoms
From Avogadro's hypothesis,
1 mole of any substance = 6.02×10²³ atoms
Thus,
1 mole of helium = 6.02×10²³ atoms
With the above information in mind, we can obtain the number of atoms in 2 moles of helium as follow:
1 mole of helium = 6.02×10²³ atoms
Therefore,
2 moles of helium = 2 × 6.02×10²³ atoms
2 moles of helium = 1.204×10²⁴ atoms
Thus, we can conclude that 2 moles of helium contains 1.204×10²⁴ atoms
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Scientific Method
PART A: Put the following steps of the scientific method in the correct order,
1 Data
2 Hypothesis
3. Conclusion
4. Problem
5. Variables
6. Research
7. Procedure
Answer:
Problem, Variables, Hypothesis, Research, Procedure, Data, Conclusion.
Explanation:
First, you have to know what the problem that you're talking about is. Then, you have to know the independent, dependent, and controlled variables are in order to make a hypothesis. Then do research about the topic. After that, you make the procedure your experiment, if that's what your doing. Then after the experiment, you find the data. Using that data, you make a conclusion.
NEED HELPPP PLSSSSSSSSSS
3. Trees, bananas, skateboards and pancakes are all solids. They have
atoms that are closely packed together and don't move around very
much. Solids also have definite shape, mass and volume. "Definite"
means that it doesn't easily change. When you pour cereal into a bowl,
the pieces of cereal don't change shape. But when you pour milk into a
bowl, the milk takes the shape of the bowl. That's because cereal is a
solid.
A
Which of the following is an example of a solid?
A. applesauce
Corange juice
B. watermelon
D. berry smoothie
Answer:
B. Watermelon
Explanation:
Watermelon is the only option with a definite shape that wouldn't change if you put it in a bowl
how does the sun light affect earths climate
Answer:
The Sun powers life on Earth; it helps keep the planet warm enough for us to survive. It also influences Earth’s climate: We know subtle changes in Earth’s orbit around the Sun are responsible for the comings and goings of the past ice ages. But the warming we’ve seen over the last few decades is too rapid to be linked to changes in Earth’s orbit, and too large to be caused by solar activity
Explanation:
When an electric circuit operates a buzzard makes a sound what happens to the electric charges in the circuit
Answer:
Explanation:
Khfxgkfxyfkx
What name is given to any chemical which increase the rate of a chemical reaction
Answer:
It is called catalyst.
Answer:
A catalyst
Explanation:
is a substance that can alter the rate of a chemical reaction. Catalysts can be successfully used to increase the rate of a chemical reaction.
A flask containing 500 liters of hydrogen gas was collected under a pressure of 980mmHg. What will be the volume if the pressure is changed to 900mmHg?
Answer:
80
Explanation:
im not rlly sure exactly but i think thats the anser
Given the formula for a compound:
What is a chemical name for the compound?
1.
1-butanamine
2.
1-butanol
3.
butanamide
4.
butanoic acid
Submit Answer
Answer:
3.
Explanation:
4 carbon equals butane
O=C-NH2 equals amide
The chemical name for the compound with the chemical formula shown in the image is 1-butanamide.
Chemical nameIn order to name the compound:
Count the number of straight-chain carbon = 4 Identify the functional group = amideFour (4) carbon is named as "But-" and the functional group is an amide on the first carbon.
Thus, the chemical name would be 1-Butanamide.
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Why would the pressure of a sample of gas at a constant volume fall .10 atm?
Answer:
As the temperature of a sample of gas falls from 45.0ºC to 30.0ºC, its pressure falls to 300.
Explanation:
What kind of energy transformations occur when you hit a coconut with a hammer
sound energy, kinetic energy,
i cant think of any more but hope this helps
Answer:
Mechanical to kinetic to sound to heat
Explanation:
Remember that all types of energy transformation end in heat
I need help on this question
What was the purpose of the Apollo space missions?
to collect rock samples from Mars
to land on Saturn
to collect rock samples from the moon
to land on Jupiter
Answer:
i agree with the above to collect rock samples
Explanation:
took test got 100 best of luck
The purpose of the Apollo space missions was to to collect rock samples from the moon.
What is moon?
The Moon is Earth's only natural satellite. It is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth (comparable to the width of Australia).The Moon is a planetary-mass object with a differentiated rocky body, making it a satellite planet under the geophysical definitions of the term and larger than all known dwarf planets of the Solar System.
It lacks any significant atmosphere, hydrosphere, or magnetic field. Its surface gravity is about one-sixth of Earth's at 0.1654 g, with Jupiter's moon Io being the only satellite in the Solar System known to have a higher surface gravity and density.
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According to plate tectonics, the continents.
do not move at all
are drifting on a sea of magma
will one day be joined together
"float' on top of the crust
Answer:
are drifting on a sea of magma.
Explanation: Please mark brainliest.
in water, what happens to a base?
It forms hydrogen ions (H+)
It condenses
It evaporates
It forms hydroxide ions (OH-)
Answer:
A base forms hydroxide ions in water.
Hope this helps
Fiona is examining a material. She notices that the material has a dull appearance and feels very brittle.
Fiona is most likely examining a _______
(I'll give brainliest)
"Typical nonmetals have a dull, coloured or colourless appearance; are brittle when solid; are poor conductors of heat and electricity; and have acidic oxides." - Wikipedia
Which two substances are reactants in the chemical reactions of cellular
respiration?
I A. Carbon dioxide
B. Water
C. Sugar
D. Oxygen
Answer:
Explanation:
A. Carbon dioxide
D. Oxygen
Answer:
Oxygen and sugar
Explanation:
What is heat of vaporization?
ОА.
It is the heat required to change a substance's temperature by 1°C.
OB.
It is the heat required to change a gram of substance from a solid to a liquid.
Ос.
It is the heat required to change a substance from a solid directly to a gas.
OD.
It is the heat required to change a gram of substance from a liquid to a gas.
O E. It is the heat required to separate one substance into two substances.
Answer:
Your answer is D. It is the heat required to change a gram of substance from a liquid to a gas.
A chemist needs 2.00 liters of hydrochloric acid. How many pints is this?
Answer:
4.22675
Explanation:
Write the beta decay equation for the following isotope: 15/6 C?
Answer:
[tex]\rm _{6}^{15}\text{C} \longrightarrow \, _{-1}^{0}\text{e} + \, _{7}^{15}\text{N}[/tex]
Explanation:
The unbalanced nuclear equation is
[tex]\rm _{6}^{15}\text{C} \longrightarrow \, _{-1}^{0}\text{e} + \, ?[/tex]
Let's write the question mark as a nuclear symbol.
[tex]\rm _{6}^{15}\text{C} \longrightarrow \, _{-1}^{0}\text{e} + \, _{Z}^{A}\text{X}[/tex]
The main point to remember in balancing nuclear equations is that the sums of the superscripts and the subscripts must be the same on each side of the equation.
Then
15 = 0 + A, so A = 15 - 0 = 15, and
6 = -1 + Z, so Z = 6 + 1 = 7
Then, your nuclear equation becomes
[tex]\rm _{6}^{15}\text{C} \longrightarrow \, _{-1}^{0}\text{e} + \, _{7}^{15}\text{X}[/tex]
Element 7 is nitrogen, so the balanced nuclear equation is
[tex]\rm _{6}^{15}\text{C} \longrightarrow \, _{-1}^{0}\text{e} + \, _{7}^{15}\text{N}[/tex]
1-Which reaction shown below is carried out by nitrifying bacteria? I will mark you as brainlist
Choose:
A.{ammonium} to {nitrate}
B.{nitrate} to {nitrogen gas}
C.{nitrogen gas} to{ammonium}
Answer:
ammonium to nitrate.
Explanation:
they tie em together
modern vacuum techniques make it possible to reach a pressure of 1.00 * 10 ^ -10 mm Hg in a laboratory system. what volume in milliliters would 1.00 * 10 ^ 6 molecules of gas occupy at this pressure and standard temp?
Answer:
around 0.283
Explanation:
Multiply the following: (1.25 x 10^15) x (3.75 x 10^5).
Answer:
[tex]4.6875x10^20[/tex]
Explanation:
If a gas occupies 22.4 L at 0.265 atm, then what will the pressure be in atmospheres if the gas occupies 35.52 L? Assume all other
variables are held constant
A)0.167 atm
B)0.437 atm
C)0.886 atm
D)149 atm
Answer:
The new pressure is 0.167 atm
The correct answer is option A
Explanation:
Step 1: Data given
Volume of the gas = 22.4 L
Pressure of the gas = 0.265 atm
The volume increases to 35.52 L
Step 2: Calculate the new pressure
P1*V1 = P2*V2
⇒with P1 = the initial pressure = 0.265 atm
⇒with V1 = the initial volume = 22.4 L
⇒with P2 = the new pressure = TO BE DETERMINED
⇒with V2 = the increased volume = 35.52 L
0.265 atm * 22.4 L = P2 * 35.52 L
P2 = (0.265 atm * 22.4 L) / 35.52 L
P2 = 0.167 atm
The new pressure is 0.167 atm
The correct answer is option A
Proper lane placement can include positioning your car...
A. away from other cars.
B. 36 inches from the right or left line.
C. one inch from either lane line.
Proper lane placement can include positioning your car 36 inches from the right or left line. Therefore, option B is correct.
What is lane positioning ?Using different lane positions to make adjustments for potential problems and create larger space between car and problem situations. Lane position is the placement of car in the center, on the right, or on the left of a lane. The width of a lane is twelve feet on most highways or streets.
There are three main positions are lane position 1 is center of lane, lane position 2 is left side, and lane position 3 is right side. Position 2 is left side of lane is for car.
Position 3 is a vehicle placement to the right when a restriction to path of travel or your line of sight occurs. Proper lane placement can include positioning your car 36 inches from the right or left line.
Thus, option B is correct.
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Which of the following is a chemical reaction?
1- Dropping a sliced orange into a vat of Sodium Dydroxide
2-Cutting a piece of paper into two pieces
3-Filling a balloon with air
4-Freezing liquid Mercury
Answer:
1- Dropping a sliced orange into a vat of Sodium Dydroxide
Explanation:
The other answers (2-4) are only physical changes that don't change any chemical compositions.
Which of the following units could not be used to measure density?
O A. Kilograms per liter (kg/L)
B. Grams per milliliter (g/mL)
C. Pounds per cubic inch (lb/in)
D. Grams per cubic centimeter (g/cm3)
Answer: Pounds per Cubic inch(lb/in3)
An exothermic reaction releases 13,450J of heat. How many calories of energy are released? A) 5 56,274 calories B)1,244 caloriesC) 134,500 caloriesD) 3,215 calories
Answer:
The correct option is;
D) 3,215 calories
Explanation:
Here we are required to convert 13,450 J to calories
1 calorie is the amount of heat required to raise the temperature of 1 gram of water by 1°C
Therefore, 1 calorie = 4.184 Joules
Hence, 1 Joule = 1/4.184 calorie for which we have;
13,450 J = 13,450 × 1/4.184 calories = 13,450/4.184 calorie
13,450 J = 3,214.63 calories
Rounding up to the nearest whole number, we have;
13,450 J ≈ 3,215 calories.
What happens when light passes from air into water?
A) The light speeds up
B) The light continues at the same speed
C) The light slows down
D) The light forms a mirage
