Answer:
scientist came to the conclusion that all living things are made of cells by con
Explanation:
Hotter objects have _______________________ particles, while cooler objects have _______________________ particles.
Hope this helps
Hotter objects have faster particles, and cooler objects have slower particles.
need help with this question plsssss
Answer:
234
Explanation:
The answer is not 53.4. Please help.
Answer:
it is 0.528 ATM.
Explanation:
why is magneisum a metal
Answer:
Chemical element, metallic, symbol Mg, situated in group IIa in the periodic table, atomic number: 12, atomic weight: 24,312. ... Magnesium is known for a long time as the lighter structural metal in the industry, due to it's low weight and to it's capability of forming mechanically resistant alloys.
What three types of particles make up an atom? What are their charges?
Answer:
Protons, neutrons, and electrons are the three main subatomic particles found in an atom. Protons have a positive (+) charge. An easy way to remember this is to remember that both proton and positive start with the letter "P." Neutrons have no electrical charge.
Answer:
Protons, positive charge
Neutrons, neutral
Electrons, negative charge
Explanation:
how was bohr´s atomic model different from those of previous scientists
Answer:
Explanation:
Neils Bohr in 1913 put forward his own model of the atoms based on the quantum mechanics originally developed by Planck.
He assumed the Rutherford's model and suggested that the extranuclear space consists of electrons in specific spherical orbitals around the nucleus. His predecessors and contemporaries did not give this perspective to the atomic model. The orbits/energy levels are designated by letters K, L, M, N .... The maximum number of electrons that can be accommodated by an energy level is 2n² where n is the principal energy level.Answer:
It showed that electrons could jump from one path to another
Explanation:
quiz
A bicycle tire has a pressure of 18.5 lb/in^2 What's the pressure in torr?
Answer:
B y is a complete collection for your time and energy for the spread of Islam in the Horn of the following to make sure
Identify the following as a chemical (C) or physical property (P):
1. blue color ______
2. melting point ______
3. density ______
4. reacts with water ______
5. flammability (burns) ______
6. solubility (dissolves) ______
7. boiling point ______
8. luster ______
Answer: 1. Phys 2. Phys 3. Phys 4. Chem 5. Chem 6. Phys 7. Phys 8. Phys
Explanation:
According to the concept of physical and chemical property ,reaction with water and flammability are chemical properties while rest are physical properties.
What are chemical properties?These properties are defined as those properties which become evident during or after a chemical reaction after the identity of the substance is changed during chemical reaction.
These properties cannot be determined externally just by viewing the substance ,these change immensely after a substance undergoes a chemical change.These are used for identification of unknown substances and for building up chemical classifications.
The major chemical properties are flammability,toxicity,reactivity,acidity and heat of combustion.For a chemical property to be apparent , it is necessary that the structure of the substance is altered.
Learn more about chemical properties,here:
https://brainly.com/question/5186976
#SPJ2
xg 4Na + 15g 02 → 70g 2Na20
Answer: 43.125g
Explanation:4Na+ O2=2Na2O
Molar mass: 23. 32. 62. React.mass: 92.
The half life of titanium 44 is 60 years. If you start with 600 grams, how much will be left after 180 years
Answer:
[tex]75\ \text{g}[/tex]
Explanation:
t = Time = 180 years
[tex]t_{1/2}[/tex] = Half-life of titanium = 60 years
[tex]N_0[/tex] = Initial amount of titanium = 600 g
We have the relation
[tex]N=N_0e^{-\lambda t}\\\Rightarrow N=N_0e^{-\dfrac{\ln 2}{t_{1/2}}t}\\\Rightarrow N=600e^{-\dfrac{\ln 2}{60}\times 180}\\\Rightarrow N=75\ \text{g}[/tex]
The mass that is left after 180 years is [tex]75\ \text{g}[/tex].
Matter that is made up of only one kind of Atom
Answer:
elements
Matter that has only one kind of atom is called an element. Gold, copper, oxygen, and mercury are examples of elements. Most matter is made up of two or more different kinds of atoms that are chemically combined. This kind of matter is called a compound.
Explanation:
Answer:
Element
Explanation:
This is the answer because:
1) All matter is made up of substances called elements.
2) Matter that iis made up of only one kind of Atom is called an Element.
Hope this helps! :D
Explaining Radioactive Decay
Explain the process of radioactive decay. What happens during radioactive decay, and what is the result at the end of radioactive decay?
Answer:
Radioactive decay is the process in which the nucleus of an unstable isotope spontaneously changes, releasing particles and energy. An unstable isotope will continue to decay until it reaches the stable form of either a different isotope of the same element that is stable or a different element that is stable.
Explanation:
Answer:
Sample Response: Radioactive decay is the process in which the nucleus of an unstable isotope spontaneously changes, releasing particles and energy. An unstable isotope will continue to decay until it reaches the stable form of either a different isotope of the same element that is stable or a different element that is stable.
If you want to make your own make sure to include.
- Radioactive decay is the process in which the nucleus of an unstable isotope spontaneously changes, releasing particles and energy.
- An unstable isotope will continue to decay until it reaches a stable form.
- The stable form could be a different isotope of the same element that is stable or a different element that is stable.
Explanation:
Edge 2021
How many carbon atoms are in 2C7H5N3O6
Answer:
14
Explanation:
What can help overcome a positive enthalpy of solution and allow a solid
solute to dissolve in water?
A. A decrease in entropy
B. A large amount of energy released
C. A large amount of energy absorbed
D. An increase in entropy
Answer: D. An increase in entropy
Explanation:
Entropy is the measure of randomness or disorder of a system. If a system moves from an disordered arrangement to an ordered arrangement, the entropy is said to increase and vice versa.
For a reaction to be spontaneous, the enthalpy of the solution must decrease and the entropy must increase.
To overcome a positive enthalpy of solution and allow a solid solute to dissolve in water, an increase in entropy would make the reaction spontaneous as the system would move to a more disordered state.
Please help! Please!!!
Look at the picture down below to answer the question!
>>Select the 2 that apply.
Q: An unsaturated hydrocarbon is represented by which structural formula(s)?
>>Choose two from the picture below that matches with the question above!
Answer:
A and D
Explanation:
unsaturated hydrocarbons have double or triple bonds
Hello! Does anyone know how the structural formula of 2, 2 dimethyl butane is? Please help!
Answer:
I have it.
Explanation:
In the name carbon dioxide what does the prefix of the second word indicate about a molecule of a dioxide A. It has two carbon atoms B. It has two oxygen atoms C. It is a polyatomic ion D. It Is an ionic bond
Answer:
The answer is option B, that is, it has two oxygen atoms.
The photo shows wires made of pure copper, an element
What would the smallest piece of copper be?
A. Copper atom
B. Mixture of different kinds of metallic elements
C. Copper molecule
D. Compound containing two or more elements
Answer:
B
Explanation:
I hope its right. I'm pretty sure.
Answer:
Explanation:
Copper Atom
Which of the following equations represents the balanced equation for the reaction of iron and oxygen?
a)
4Fe + 3O2 → 2Fe2O3
b)
2Fe + O2 → Fe2O3
c)
3Fe + 3O2 → 2Fe2O3
d)
Fe + 3O2 → Fe2O3
Answer:
D is balanced. :)
Among the following equations the one that represents the balanced equation for the reaction of iron and oxygen is a.
4Fe + 3O₂ → 2Fe₂O₃
What is balancing of a reaction?Balancing of a reaction is done according to the "Law of conservation of mass" and balancing helps in solving stoichiometry questions correctly as if we will not balance the reaction then the quantitative results in a particular question doesn't come correctly.
Balancing of a reaction helps in mole concept as well and it is one of the laws of chemical reactions as well.
Some examples of balanced chemical reactions are-
2Mg(s) + O₂(g) ⟶ 2MgO(g)
Ca(OH)₂ + H₃PO₄ → Ca₃(PO₄)₂ + H₂O
Therefore, Among the following equations the one that represents the balanced equation for the reaction of iron and oxygen is a.
4Fe + 3O₂ → 2Fe₂O₃
Learn more about Balancing of a reaction here:
https://brainly.com/question/14280002
#SPJ2
If 2.5 grams of calcium bromide reacted with excess lithium oxide, how many grams of bromide product would be formed?
Answer: 2.17 g of bromide product would be formed
Explanation:
The reaction of calcium bromide with lithium oxide will be:
[tex]CaBr_2+Li_2O\rightarrow 2LiBr+CaO[/tex]
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of calcium bromide}=\frac{2.5g}{199.9g/mol}=0.0125moles[/tex]
As lithium oxide is in excess, calcium bromide is the limiting reagent.
According to stoichiometry :
1 mole of [tex]CaBr_2[/tex] produce = 2 moles of [tex]LiBr[/tex]
Thus 0.0125 moles of [tex]CaBr_2[/tex] will require=[tex]\frac{2}{1}\times 0.0125=0.025moles[/tex] of [tex]NH_3[/tex]
Mass of [tex]LiBr=moles\times {\text {Molar mass}}=0.025moles\times 86.8g/mol=2.17g[/tex]
Thus 2.17 g of bromide product would be formed
I don’t know this question please help
Answer: A. is elliptical
B. IS inrregulur C. spiral
Explanation: this should be it
If the length, width, and height of a box are 9.50 cm, 6.75 cm and 3.50 cm, respectively, what is the volume of the box in units of milliliters and liters?
(a) How many mL will the box contain?
(b) How many L will the box contain?
Answer: 1cm³= 1mL
Explanation:
What takes place when a chemical change occurs
Answer:
In a chemical change, the atoms in the reactants rearrange themselves and bond together differently to form one or more new products with different characteristics than the reactants. When a new substance is formed, the change is called a chemical change.
Explanation:
hope this helps
When bonds between molecules or atoms are created, disrupted, or both, chemical changes result. This implies that a material is changed from one with a certain set of attributes into another with a different set of properties.
What is an atom ?Each atom is made up of a nucleus and one or more electrons that are linked to it. One or more protons and a significant number of neutrons make up the nucleus. Only the most prevalent kind of hydrogen is neutron-free. The smallest component of ordinary stuff that makes up a chemical element is an atom.
An atom's nucleus is surrounded by an area of electrons. The electrical charge of every electron is negative one. Protons and neutrons, which together make up an atom's nucleus, are made of quarks.
The atoms in the reactants rearrange and link with one another differently to create one or more new products that vary from the reactants in several ways.
Thus, When bonds between molecules or atoms are created, disrupted, or both, chemical changes occur.
To learn more about an atom, follow the link;
https://brainly.com/question/1566330
#SPJ2
Which of the 3 particles can never change without changing the identity of the atom?
Answer:
Neutrons,Electrons and Protons I think.
One of the steps to sweeten sour gas using the Claus process is reacting
hydrogen sulfide gas with sulfur dioxide gas to produce water vapour and sulfur.
16 H2S(g) + 8 SO2(g) → 16 H2O(g) + 3 Sg(s)
8.56 kL of hydrogen sulfide at 175 kPa and 250 °C reacts with excess sulfur
dioxide. Calculate the mass, in kg, of sulfur produced.
The mass, in kg, of Sulfur produced : 2.072 kg
Further explanationGiven
V = 8.56 kL = 8560 L
P = 175 kPa = 1,73 atm
T = 250 + 273 = 523 K
Required
mass of Sulfur produced
Solution
mol of H₂S :
[tex]\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{1.73\times 8560}{0.082\times 523}\\\\n=345.3[/tex]
mol of Sulfur based on mol H₂S as a limiting reactant( excess Sulfur dioxide)
From equation, mol ratio H₂S : S = 16 : 3, so mol S :
[tex]\tt \dfrac{3}{16}\times 345.3=64.74[/tex]
Mass S(Ar = 32 g/mol) :
= mol x Ar s
= 64.74 x 32
= 2071.68 g = 2.072 kg
8. How many milligrams of iron are delivered from a 250. mg tablet of FeSO4.7H20
Answer:
[tex]molar \: mass \: of \: FeSO _{4}.7H _{2}0 = (56 + 32 + (16 \times 4) + (7 \times 18)) \\ = 278 \: g \\ \\ (278 \times 1000) \: mg \: of \: FeSO _{4}.7H _{2}0 \: contains \: (56 \times 1000) \: mg \: of \: Fe \\ 250 \: mg \: of \: FeSO _{4}.7H _{2}0 \: contain \: ( \frac{250 \times 56 \times 1000}{278 \times 1000} ) \\ = 50.35 \: mg \: of \: Fe[/tex]
The mass of Fe delivered by 250 mg Iron sulfate heptahydrate has been 50.35 mg.
The molar mass of the compound has been the sum of the mass of each element present in the compound. The given compound is iron sulfate heptahydrate. The compound has molar mass 278 grams.
1 mole of compound has been consisting of 1mole of iron.
278 grams Iron sulfate = 56 grams Fe
278,000 mg Iron sulfate = 56,000 mg Fe.
The mass of iron in 250 mg compound can be given as:
278,000 mg Iron sulfate = 56,000 mg Fe
[tex]\rm 250\;mg \;Iron\;sulfate\;=\;\dfrac{56,000}{278,000}\;\times\;250[/tex]
250 mg Iron sulfate tablet = 50.35 mg Fe.
The mass of Fe delivered by 250 mg Iron sulfate heptahydrate has been 50.35 mg.
For more information about the mass of compound, refer to the link:
https://brainly.com/question/2998100
when is light produced during e- configuration
How are rocks formed? Explaine in 500 words or less.
Explanation:
Rocks are formed from aggregates of minerals. There are three different types of rocks and they are formed by different processes. Igneous rocks are formed by the cooling and solidification of magma within or on the earth crust. Sedimentary rocks are formed from pre-existing rocks by the lithification of sediments brought into a basin of deposition. Metamorphic rocks are changed rocks that have been mineralogically altered.
Different rocks form under specific conditions and environment. But rocks are connected to one another through the rock cycle. The rock cycle shows that rocks can transition from one form to another.what charged particle is produced during ionic bonds
Answer:
An ionic bond is formed by the complete transfer of some electrons from one atom to another. The atom losing one or more electrons becomes a cation or a positively charged ion. The atom gaining one or more electrons becomes an anion which is a negatively charged ion.
Which type of climate does Florida have due to its latitude?
