Which statement describe global warming? Select 2 answer choices
Global warming is the long-term heating of Earth's climate system observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere
Which best describes a chemical reaction that follows the law of conservation of matter?
Group of answer choices
A. The reactants have the same mass as the products.
B. The reactants have the same density as the products.
C. The products conserve all chemical properties of the reactants.
D. The products conserve all physical properties of the reactants.
PLEASE HELPP THIS IS DUEE!!!
Answer:
that's so easy but if you still need the answer i am willing to help
Explanation:
relate the concepts of isotope and mass number
Answer:
Explanation:
Forms of the same atom that differ only in their number of neutrons are called isotopes. Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons. ... A property closely related to an atom's mass number is its atomic mass.
I need help on this problem. I need it answered ASAP
Use this formula: Density = Mass/Volume
Given in the question:
Mass: 10g
Volume: 5cm3
The calculations:
Density = Mass/Volume
= 10/5
= 2g/[tex]cm^{3}[/tex]
Therefore, the density will be 2g/[tex]cm^{3}[/tex]
List 3 problems that can be solved with magnets
Answer:
- Failed internal wiring
- reaching a hard to get metal item
- keeping a item on a metal surface
Explanation:
Please give me BRAINLIEST :))
True or False - The central nervous system allows us to sense the environment.
Answer: no
Explanation: they tell the organs what to sense.
A chemist is trying to classify an unknown substance as either a metal or nonmetal. What question should the chemist use to help classify the material?
A. Does the material feel hard to the
touch?
B. Does the material feel rough or smooth?
C. Is the material a good conductor or a poor conductor?
D. Will the material float in water?
Please Help me!!!
Answer:
c
Explanation:
metals are good conductors, while non metals are not good conductors
Question 4(5 points)
(01.07 MC)
A student compares the boiling point of substances having different intermolecular forces. Which independent variable did the student most
likely use? (5 points)
Ob
Various compounds made of different forces between molecules
Type of source used to heat up the substances
Type of container used for the substances
Boiling points of various substances
Od
Answer:
Various compounds made of different forces between molecules
Explanation:
In an experiment, the independent variable is the variable that is changed or manipulated by the experimenter in order to effect a measurable response.
According to this question, a student compares the boiling point of substances having different intermolecular forces. This means that the student uses different substances with different intermolecular forces and measures the boiling point of each, which depends on the intermolecular forced in them. Hence, the independent variable in this experiment is the VARIOUS COMPOUNDS MADE OF DIFFERENT FORCES BETWEEN MOLECULES.
The isotope Np-238 has a half life of 2.0 days if 96 grams of it were present on Monday how much will remain six days later
Answer:
12.02 g
Explanation:
From the question given above, the following data were obtained:
Half life (t½) = 2 days
Original amount (N₀) = 96 g
Time (t) = 6 days
Amount remaining (N) =..?
Next, we shall determine the rate of disintegration of the isotope. This can be obtained as follow:
Half life (t½) = 2 days
Decay constant (K) =?
K = 0.693 / t½
K = 0.693 / 2
K = 0.3465 /day
Therefore, the rate of disintegration of the isotope is 0.3465 /day.
Finally, we shall determine the amount of the isotope remaining after 6 days as follow:
Original amount (N₀) = 96 g
Time (t) = 6 days
Decay constant (K) = 0.3465 /day.
Amount remaining (N) =.?
Log (N₀/N) = kt / 2.303
Log (96/N) = (0.3465 × 6) / 2.303
Log (96/N) = 2.079/2.303
Log (96/N) = 0.9027
Take the anti log of 0.9027
96/N = anti log (0.9027)
96/N = 7.99
Cross multiply
96 = N × 7.99
Divide both side by 7.99
N = 96 /7.99
N = 12.02 g
Therefore, the amount of the isotope remaining after 6 days is 12.02 g
How do you calculate the energy, in joules, of a photon of ultraviolet light with a frequency of 6.8 x 10^15 Hz?
Answer:
E = 45.08×10⁻¹⁹j
Explanation:
Given data:
Energy of photon in joule = ?
Frequency of photon = 6.8×10¹⁵ Hz
Solution:
Formula:
E = h.f
f = frequency
h = planck's constant (6.63×10⁻³⁴Js)
E = energy
Value of planck's constant is 6.63×10⁻³⁴Js.
E = 6.63×10⁻³⁴Js ×6.8×10¹⁵ Hz
Hz = s⁻¹
E = 6.63×10⁻³⁴Js ×6.8×10¹⁵ s⁻¹
E = 45.08×10⁻¹⁹j
Energy is the quantitative unit, which is measured in joules. The energy of a photon of UV light having the frequency 6.8×10¹⁵ Hz is 45.08×10⁻¹⁹ Joules.
Given:
Frequency of photon = 6.8×10¹⁵ Hz
Energy of a photon in joule =?
Usingt the formula of energy:
E = h x v
where,
v = frequency
h = planck's constant (6.63×10⁻³⁴Js)
E = energy
Substituting the values in the equation, we get:
E = 6.63×10⁻³⁴Js ×6.8×10¹⁵ Hz
E = 6.63×10⁻³⁴Js ×6.8×10¹⁵ s⁻¹
E = 45.08×10⁻¹⁹ Joules
Therefore, the energy of a photon in the UV region is 45.08×10⁻¹⁹ Joules
To know more about energy, refer to the following link:
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What do you think is the difference between a scientific theory and law?
Answer:
A scientific theory predicts why something might happen and when more information goes into the theory it can better predict. But a law is something that no matter what will always be true.
Explanation:
How can we determine the constants of an experiment?
Answer:
Identify the variables and constants in your experiment. In a controlled experi- ment, a is any factor that can change. Constants are all of the factors that are the same in both the experimental group and the control group.
Which element family is all 2-
Answer:
Alkaline Earth Metals
Explanation:
:)
please help if you can. thank you.
Which is responsible for an atom’s identity?
A.Protons
b.Electrons
c.Neutrons
d.Valence electrons
A beaker with a pale liquid in it massed 84.2 grams on a digital balance. Its volume read 42mL
Answer:
320 ml
Explanation:
Water and salt are compounds made of the combination of more than one type of atom. Which statement is false?
A. Because they they are are compounds, compounds, they they cannot cannot be be pure pure substances.
B. Both compounds compounds are are considered considered pure pure substances.
C. These compounds compounds have have specific specific physical physical properties properties that that never never change.
D. These compounds compounds have have distinct distinct chemical chemical properties.
Compounds are made of the various elemental atoms joined together. Water and salt are compounds that can be present in their pure form. Thus, option A is false.
What are compounds and pure substances?A compound is a substance formed by the bond between the atoms of the elements that shares, transfers, donates, or gains electrons to join and interlink chemically.
The pure substance is characterized by the presence of only a single type atom of the element. They have invariability and can exist in various phases with constant composition.
Water and salt are compounds made of two or more atoms of different elements that have specific physical properties and distinct chemical properties.
Therefore, option A. the compounds cannot be pure substances is false.
Learn more about pure substance here:
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Which pair of substances would most likely result in the production of a solid when reacting with a base?
Answer:
metal salts, and carbon dioxide
Explanation:
How many moles would 9.02 x 10^25 molecules of HCI equal?
Answer:
The answer is 149.83 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
N = 9.02 × 10^25 molecules of HCI
We have
[tex]n = \frac{9.02 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 149.83388704...[/tex]
We have the final answer as
149.83 molesHope this helps you
6th grade help me pleaseee
Answer:
D hope this helps
Explanation:
Answer:
d. what will happen to the freezing point of the water if salt is added?
Which two factors can affect a solid solute's solubility
A. Whether the particles of the solute and solvent are charged
B. Pressure acting and solute
C. Length of time spent stirring
D. Temperatures of the solvent and solute
Answer:
A and D
Explanation:
It might seem like B and D but I took the test and it's A and D.
Answer:
Whether the particles of the solute and solvent are charged
Temperatures of the solvent and solute
Explanation:
A. Whether the particles of the solute and solvent are charged
B. Pressure acting and solute
C. Length of time spent stirring
D. Temperatures of the solvent and solute
Please help it’s due today I will give brainliest
1st and 4th options are suitable answers, as these 2 changes are not exactly physical changes as it cant return back to original form and as well as its not cooling, so I feel its 1st and 4th options
Divide the numbers
2
2
+
2
2
=
4
5
2
2
+
2
2
=
4
x
5
22+22=54x
1
+
2
2
=
4
5
1
+
2
2
=
4
x
5
1+22=54x
2
Divide the numbers
again
1
+
2
2
=
4
5
1
+
2
2
=
4
x
5
1+22=54x
1
+
1
=
4
5
1
+
1
=
4
x
5
1+1=54x
3
Add the numbers
1
+
1
=
4
5
1
+
1
=
4
x
5
1+1=54x
2
=
4
5
2
=
4
x
5
2=54x
4
Multiply all terms by the same value to eliminate fraction denominators
2
=
4
5
2
=
4
x
5
2=54x
5
⋅
2
=
5
⋅
4
5
5
⋅
2
=
5
⋅
4
x
5
5⋅2=5⋅54x
5
Simplify
Multiply the numbers
Cancel multiplied terms that are in the denominator
1
0
=
4
10
=
4
x
10=4x
6
Divide both sides of the equation by the same term
7
Simplify
Show less
Solution
5
2
=
Answer:
This is not a question
Explanation:
no
how do i know if the particles are monatomic or diatomic or tri-atomic or tetratomic
Explanation:
Monaotomic:- the elements that have only one atom in molecule are called monaotomic elements. they are stable. Example:-Ne,Ar all are noble gases
Diatomic:-the elements that have two atoms are called diatomic molecules. Example:- Oxygen
Triatomic:-the elments that have three atoms are called tri-atomic elements they are unstable. Ex.ozone
Which refers to the number of wavelengths that pass a fixed point in a second?
wavelength
O amplitude
frequency
O compression
Please hurry will give brainliest on 10 mins
Answer:
frequency
Explanation:
The number of wavelengths that pass through a fixed point in a second is called the frequency of the wave. It has the unit of Hertz. Hence, option C is correct.
What is frequency ?The term that refers to the number of wavelengths that pass a fixed point in a second is frequency.
Frequency is a fundamental concept in wave motion and is defined as the number of complete cycles of a wave that occur per unit time. For example, the frequency of a sound wave is measured in hertz (Hz) and is equal to the number of sound wave cycles that occur per second.
The higher the frequency of a wave, the more cycles occur in a given period of time. Wavelength, on the other hand, refers to the distance between two adjacent points on a wave that are in phase with each other, such as the distance between two crests or two troughs.
Wavelength and frequency are related, and the frequency of a wave is inversely proportional to its wavelength. As the frequency of a wave increases, its wavelength decreases.
Amplitude refers to the maximum displacement of a wave from its equilibrium position, while compression is a region in a longitudinal wave where the particles are close together. Hence, option C is correct.
Find more on frequency:
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Which is a common psychological side effect of dementia?
A.optimism
B. loss of brain functionality
C. emotional distress
D.loss of coordination
Answer:
D is your Answer just did the quiz
( date on bottom when I did the quiz)
Explanation:
3 - 24 - 2021
Please answer this, im too lazy to do the experiment.
1. What happened to the heavier materials in a mixture when left undisturbed?
2. How can we separate liquid and heavier particles in a mixture?
3. What materials are attracted by the magnet?
Explanation:
(1) heavier materials sink to the bottom of the mixture
(2)use a filter funnel and filter paper (filtration method)
(3) ferromagnetic materials (typically metals)
How many grams are there in 1.18 X 1026 atoms of iridium?
PLS HELP What is the name of the value located in the top right of an element?
Answer:
It's the elements atomic mass and the number of neutrons and protons in an atom.
Explanation: