Answer:
There are 5 neutrons in beryllium
how to calculate molecular mass?
When an iron nail is ground into powder, its mass ____.
a. stays the same
b. decreases
c. increases
d. cannot be determined
When paper turns yellow-brown upon exposure to sunlight, what type of change is likely taking place?
a. a physical change
b. a chemical change
c. neither a physical change nor a chemical change
d. both a physical change and a chemical change
Explanation:
(a) The mass of an object remains the same always. It is independent of its location. In this case, an iron nail is ground into powder. It means that its mass will remain unchanged. Hence, (a) is the correct option.
(b) Whenever there is a change of color of an object, a chemical reaction occurs. It shows that a reaction happens there. In this problem, a paper turns yellow-brown upon exposure to sunlight. A chemical reaction takes place there. Hence, (b) is the correct option.
1) The mass of any substance remains the same irrespective of the state.
Thus, an iron nail ground into powder should have the same mass unless parts of it got lost during grinding.
2) A paper that turns yellow-brown upon exposure to sunlight is likely undergoing a chemical change. It could be that the light oxidizes the atoms of the paper.
Chemical changes occur when the atoms of a substance combine with another substance to form new products. New products are not formed in physical changes and the original product can be retrieved by physical means.
More on physical and chemical changes can be found here: https://brainly.com/question/1161517?referrer=searchResults
Living sustainably means living on ____—the renewable resources such as plants, animals, soil, clean air, and clean water provided by Earth's natural capital. A. Exponential growth natural income ecosystem services factors of sustainability biodiversity
Answer:
natural income
Explanation:
Living sustainably in the 21st century means coexisting with the nature. In other words, to live sustainably means to meet the needs of the human without affecting or degrading the mother nature.
In the context, living sustainably means to live from the natural income from the nature's gift to us, using their natural resources and not hurting them or exploiting them. They may be resources from the soil, plants, clean air, animals, nature's clean water,etc.
ANSWER QUICKLY PLEASE!!!
Explain how electron microscopes work and why some scientists might prefer to use electron microscopes instead of light microscopes.
Answer:
Electron microscopes differ from light microscopes in that they produce an image of a specimen by using a beam of electrons rather than a beam of light. Electrons have much a shorter wavelength than visible light, and this allows electron microscopes to produce higher-resolution images than standard light microscopes.
Explanation:
1. Measuring instruments, such as rulers and graduated cylinders, are often used in experiments to increase the A clarity of the hypothesis B. testability of the hypothesis C. accuracy of the data sample size of the data 5
Answer:
C. accuracy of the data sample size of the data
Explanation:
Measuring instruments, such as rulers and graduated cylinders, are often used in experiments to increase the accuracy of the data sample size which is usually gotten from the taken reading.
Measuring instruments such as rulers have accurate readings which makes measurements in any form very easy and more accuracy.
PLS I NEED HELP give me examples of an atom
Answer:
Neon (Ne)
Hydrogen (H)
Argon (Ar)
Iron (Fe)
Calcium (Ca)
Deuterium, an isotope of hydrogen that has one proton and one neutron.
Plutonium (Pu)
F-, a fluorine anion.
Explanation:
I got u
A(n) __________________ is a statement of what you think will happen during an investigation. It is often written in the form of an if... Then... Because statement. Group of answer choices
Answer:
Hypothesis. Hope this helped! :)
Matter and energy are
OA) similar to work and distance.
OB) interconvertible.
O C) not related to each other.
O D) similar to mass and weight.
what is hydraulic pressure?
give an answer to questions 3 will give you 20 point ASSSAAPP
Answer:
Explanation:
1. It is five valence electrons.
2. It is four valence electrons.
3. It is six valence electrons.
4. It is two valence electrons.
I do hope I helped you! :)
Answer:
1. c
2. b
3. a
4.d
Explanation:
how does kinetic energy at the bottom of a hill compared to its potential energy at the top
Answer:
Kinetic energy would have to work ten times harder than potential energy.
Explanation:
Let’s say you have a boulder and your asked to push it up the hill it would be difficult right? But lets reverse the situation what if you are asked to roll the boulder down the hill it wouldn’t be much work because the hill is basically doing all the work For you. Hope this Helps:)
1.0250 - 0.00063 =
O 1.02
1.0243
1.02437
DONE
Answer:1.0243
Explanation: I think that is it
The answer is B aka 1.0250 :)
Help me find the answer please
Which of the items shown here will protect you from a chemical burn? Select all that apply.
A hand in a rubber glove.
A fire extinguisher.
A pair of glasses with clear shields attached on the sides.
A power source.
Answer:1 & 2
Explanation:
Answer:
A. The rubber gloves and C. the protective glasses
Explanation:
I just answered this question and it was correct.
Hope this helps!!!!
Please mark my answer the Brainiest!!!!!!
1. The density of a substance is 4.8 g/mL. What is the volume of a
sample that is 19.2 g?
Answer:
d= 4.8g/mL
m= 19.2 g
V=m/d
V= 4 mL
Why does the copper(I) ion Cu+ have 10 3d electrons?
a 1 mL pipette delivers a measured volume of .98 mL (calculate the percentage error)
Answer:
2%
Explanation:
.98 is 98% of one and therefore they are missing 2%
Answer:
2%
Explanation:
The answer is 2%.
100-98 is 2.
2. If an eagle is flying at a constant speed, it is accelerating. True or
False
Answer:
False
Explanation:
Answer:
:0
Explanation:
A calorimeter made from a can is used to measure the calories in a peanut. During the experiment, the
measured calories were 35% of the true/accepted value given by references
Answer:
The heat generated per gram of sample in calories is 0.87 g
Explanation:
Given that,
A calorimeter made from a can is used to measure the calories in a peanut.
During the experiment, the measured calories were 35% of the true/accepted value given by references
Suppose, the mass of peanut is 0.4 g and find the
We need to calculate the heat generated per gram of sample in calories
Using formula of heat generated
[tex]q=\dfrac{q_{penut\ calorimeter}}{m_{peanut}}[/tex]
Put the value into the formula
[tex]q=\dfrac{0.35}{0.4}[/tex]
[tex]q=0.87\ g[/tex]
Hence, The heat generated per gram of sample in calories is 0.87 g
story that explains an example of a scientific method
Answer:
I don't understand you question
what is the name of that equipment she is using
Answer:
picture?
Explanation:
Wich tools are appropriate to determine the densety of an irregular-shaped object ?
Answer:
The most accurate way to determine an object's volume, especially in the case of an irregularly shaped object, is to immerse it in water and measure the amount of water it displaces. A graduated cylinder large enough to hold both the object and enough water to fully immerse it is the best tool for this job.
A liquid has a density of 0.70g/ml. Find the mass of the liquid which can be put
into a beaker holding 130mL.
Answer:
The answer is
91 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
density of liquid = 0.70 g/mL
volume = 130 mL
The mass is
mass = 0.7 × 130
We have the final answer as
91 gHope this helps you
In coulombs, how much positive charge is there IN a barium nucleus? On a barium ion?
Answer:
The amount of positive charge in a barium nucleus is approximately 8.972 × 10⁻¹⁸ coulomb
Explanation:
The amount of positive charge there is in a barium nucleus is found as follows;
The atomic number of an element is equal to the number of proton present in the atom
The atomic number of barium = 56 = The number of protons in an atom of barium
The positive charge of a single proton is known as an elementary charge, e, given by the formula, e = F/N[tex]_A[/tex]
Where;
F = Faraday's constant
N[tex]_A[/tex] = The Avogadro's number
Therefore, e = 1.602 176 634 × 10⁻¹⁹ C
Which gives the positive charge, Q, of the protons of a barium nucleus as follows;
Q = Number of protons × e
Q = 1.602176634 × 10⁻¹⁹ × 56 ≈ 8.972 × 10⁻¹⁸ Coulomb per atom of barium.
The amount of positive charge in a barium nucleus ≈ 8.972 × 10⁻¹⁸ coulomb.
A recycling center must find a way to separate all of the aluminum cans from those made of nickel or iron. What would be a reliable, efficient way to separate them?
Answer:
Use a giant magnet to pick up the iron and nickel ones, leaving the aluminum behind.
Explanation:
Stay safe!
I really need help with this before 4:50
Your Uncle Danny just moved into a new apartment and wants to make his famous spaghetti sauce for his new
neighbors. Unfortunately, he hasn't unpacked all of his kitchen utensils. His recipe calls for ' a cup of
oregano, however he can only find a teaspoon to measure out his spices. How many teaspoons of oregano
would be the same as a cup?
Answer:
48 teaspoons
Explanation:
1 cup equals 48 teaspoons.
If the block were to be cut in half, what would be the
density of the smaller block?
Answer:
Density stays the same
Explanation:
The density remains the same because cutting the object in half will divide the mass & volume by the same amount. Also, the density of a substance remains the same no matter what size it is.
how do i convert 0.5L to mL
Answer: 500
Explanation: there's 0.001L in every mL. Divide the mL
by 1000 or multiply the liter by 1000.
how are protons and neutrons found?
Answer:
Electrons are found in shells or orbitals that surround the nucleus of an atom. Protons and neutrons are found in the nucleus. They group together in the center of the atom.
Explanation:
I'm not sure if this is correct but I hope this helps.
Explain why the design of the bird's nest in the picture provides good insulation for the eggs.
Answer:
First, the lining may consist of loose, smaller bits of the same materials that have been incorporated into the latticework of the nest. These finer materials are utilized to shed water, deter pests, conceal the eggs from predators, insulate, and cushion them. ... They also serve to insulate and cushion the eggs.
Explanation:
Is copper penny react
reaction with Nitric
acid a
Chemical or physical
Change?
Answer:
The reaction that occurs is a redox reaction. The Copper metal (Cu 0)on the copper pennies is oxidized in concentrated nitric acid to produce Cu2+ ions. Copper is easily oxidized to Cu2+, which is blue in aqueous solutions (water) so you should see the solution turn blue as the copper penny reacts.
Have a nice day ;)(^-^)
Taking into account the definition of chemical and physical change, the reaction of the copper penny with nitric acid is a chemical change.
Physical changePhysical changes are those in which the substances involved are the same before and after the change. That is, a physical change is a transformation in which the nature of matter does not change.
Chemical changeChemical changes are considered to be those in which the substances involved are transformed into totally different ones.
In this way, the initial substances do not exist after the phenomenon has occurred and instead, new substances are formed, different from the initial ones.
That is, a chemical change is a transformation in which the nature of matter varies.
This caseWhen a penny of copper reacts with nitric acid, a redox reaction occurs where the copper metal in the copper pennies is oxidized to produce Cu²⁺ ions, whereas because the nitric acid oxidizes the copper, the nitric acid itself is reduced to nitric oxide (NO). Nitric oxide then reacts with oxygen in the air to produce nitrogen dioxide (NO₂). This can be represented by:
Cu + 4 HNO₃ → Cu²⁺(ac) + 2 NO₃⁻ + 2 NO₂ + 2 H₂O
Finally, the reaction of the copper penny with nitric acid is a chemical change because a redox reaction occurs.
Learn more:
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