Answer: Na+1 —> it has 1 outer valence electrons that was lost to a nonmetal
O-2 —> oxygen needs 2 more electrons to be stable
Explanation:
what kind of change is burning paper
how do heater meals work?
Answer:
The patented TRUE-TECH Self-Heating Technology is a simple combination of food grade iron and magnesium powder, salt, and water. When the contents of the water pouch are poured over the heater pad, the Food Heater releases enough heat to warm-up a pre-cooked meal 100 degrees Fahrenheit in approximately 10 minutes.
Explanation:
Indicate which element of the following pairs has the greater electronegativity
Answer:
sodium,silicon
Explanation:
sodium=11
siicon=14
Why are atoms more stable when combined?
A)The atoms have empty valence energy levels.
B)The atoms are less lonely.
C)The valence electrons feel less stable when combined.
D)The atoms have full valence energy levels.
Answer:
D
Explanation:
Which sub-atomic particle is NOT found at the center of the atom?
Answer:
Protons and neutrons are in the nucleus (the center of an atom), but electrons are not.
The most common units for density are _______ and _______.
Answer:
g/cm3
Explanation:
(grams, centimeters)
4. Which of the following types of radiation is a form of ionizing radiation from
outer space? bong
A. cosmic radiation
C. gamma rays
B. visible light
D. X-radiation
Sam wants to dissolve a drink mix quickly before she goes to school. She
adds 2 teaspoons of the drink mix to a glass that contains 8 ounces of
room-temperature water. What could Sam do that would best help to
speed up the dissolving?
Sam can stir the water after adding the drink mix to help increase or speed up the dissolving process in this scenario.
What is Dissolution?This is the process in which a solute dissolves in a solvent to form a solution under certain conditions.
Stirring will increase the surface area thereby leading to an increase in the dissolving process which makes it the most appropriate choice.
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Which phase of the moon is shown?
O full moon
O first quarter
O waning gibbous
O waxing crescent
Calculate the pressure exerted on the floor when an elephant who weighs 2400 N
stands on one foot which has an area of 0.4 m².
Answer:
The answer is
6000 N/m² or 6000 PaExplanation:
The pressure exerted by an object given the force of the object and the area can be found by using the formula
[tex]P = \frac{f}{a} \\ [/tex]
where
P is the pressure
f is the force
a is the area
From the question
f = 2400 N
a = 0.4 m²
So we have
[tex]P = \frac{2400}{0.4} \\ [/tex]
We have the final answer as
6000 N/m² or 6000 PaHope this helps you
I need help me I need helps
Answer:
a
Explanation:
Answer:
2 A
Explanation:
(b) Describe how Aluminium chloride can be separated from a mixture of aluminium chloride
and sodium chloride
Answer:
Since AlCl3 sublimes and NaCl does not sublime sublimation process will separate the two. Heat the mixture, aluminium chloride sublimes into vapour and forms the sublimate on the cooler parts of heating tube sodium chloride will remain at the bottom of the heating tube.
Explanation:
I hope it helps you ..
How would the structure of an atom be different if the nuclear force caused neutrons and electrons to be held together?
Answer:
The nuclear force (or nucleon–nucleon interaction or residual strong force) is a force that acts between the protons and neutrons of atoms. Neutrons and protons, both nucleons, are affected by the nuclear force almost identically. Since protons have charge +1 e, they experience an electric force that tends to push them apart, but at short range the attractive nuclear force is strong enough to overcome the electromagnetic force. The nuclear force binds nucleons into atomic nuclei.
Explanation:
what particle is bigger Fr or Fe3+ why?
Answer:
Fe2+ is greater in size as it has lost less electrons than Fe3+ . So, the nuclear pull is more strong on Fe3+ decreasing the atomic size. Thus Fe2+ is greater in size.
Explanation:
How many electrons are In Sn4+
Answer:
50 Electrons are found in Sn4+
Explain the function of the valence ring?
Answer:
It provides the electrons that "make" electricity and it contains the electrons that are involved in molecular bond formation.
The baseball player hits a ball of 0.145 kg about 38.8 m to second base with a force of 40 N. What is the acceleration?
Answer:
275.9 m/s2
Explanation:
a = 40N ÷ 0.145 kg
Answer:
275.9 m/s2
Explanation:
275.9 m/s2
what is the formula of boron nitride?
This is a question in Seneca, plz help asap bc I can't skip it!!
What do we call a pure sample that's run next to the tested substance to see if it's a component in the mixture?
Answer:
Chromatography?
Explanation:
When a pure sample is run next to a tested substance to check if it is a component in the mixture it is called a ; Reference value
A reference value in a test is the average of repeated value gotten from laboratory measurements carried out in the lab using an accurate measurement tool. It is the bench mark value for which the value of any tested substance will be compared to.
Therefore to verify if a tested substance is a component in the mixture we have to run it next to a pure sample ( reference value ).
Hence we can conclude that When a pure sample is run next to a tested substance to check if it is a component in the mixture it is called a ; Reference value
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how many moles are equal to a 0.25g sample of chromium?
Answer:
0.0048 mol Cr
Explanation:
Step 1: Define
Molar Mass of Chromium (Cr) - 52.00 g/mol
Step 2: Use Dimensional Analysis
[tex]0.25 \hspace{3} g \hspace{3} Cr(\frac{1 \hspace{3} mol \hspace{3} Cr}{52.00 \hspace{3} g \hspace{3} Cr} )[/tex] = 0.004808 mol Cr
Step 3: Simplify
We are give 2 sig figs.
0.004808 mol Cr ≈ 0.0048 mol Cr
1. (Physical or Chemical) properties describe matter.
2. (Physical or Chemical) properties of a substance can be easily observed.
3. One can use their five senses to determine the (Physical or Chemical) properties of a substance.
4. (Physical or Chemical) properties usually describe how a substance reacts. 5. (Physical or Chemical) properties are not as easy to observe.
6. (Physical or Chemical) properties can be used to identify substances.
Explanation:
2. Chemical
3. Physical
5. Chemical
I think that's it
Hope it helps :)
Physical properties describe matter.Physical properties of a substance can be easily observed.One can use their five senses to determine physical properties.Chemical properties usually describe how a substance reacts. Physical properties can be used to identify substances.
What are physical properties?Any property which describes the state of a physical system is called as a physical property.Changes in physical properties are used to describe changes between the states. They are often related to as observable properties.
Physical property which can be quantified is a physical quantity. These are also classified further with respect to their directionality. Isotropic properties do not change with direction of observation while anisotropic properties change with direction of observation.
Physical properties are differentiated from chemical properties by the way they determine how a substance behaves in a chemical reaction.
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What subatomic particle can be found in the nucleus?
Answer: protons
Explanation:
The nucleus contains two types of subatomic particles, protons and neutrons. The protons have a positive electrical charge and the neutrons have no electrical charge. A third type of subatomic particle, electrons, move around the nucleus. The electrons have a negative electrical charge.
Q1.
This question is about mixtures.
(a)
Substances are separated from a mixture using different methods.
Draw one line from each substance and mixture to the best method of separation.
Substance and mixture
Method of separation
Chromatography
Ethanol from ethanol and
water
Crystallisation
Salt from sea water
Electrolysis
The different colours in
black ink
Filtration
Fractional distillation
(3)
(hl
A student filters a mixture.
What is the wavelength of light emitted between the 3 rd and 1 st energy levels? 121.5 nm 94.5 nm 102.5 nm 1875 nm
Why does a ballon filled with helium rise while a ballon filled with an equal volume of average atmospheric Air does not
Italian salad dressing ....
1)element
2)compound
3)solution
4)mechanical mixture
Answer:
compound
Explanation:
Once you mix it you cant take it back apart
differences between mixtures and elements
Mixtures are a group of elements that are mixed together but not chemically combined
Elements are the fundamental materials of which all matter is composed.
Element: A substance that is made up of only one type of atom. Compound: A substance that is made up of more than one type of atom bonded together. Mixture: A combination of two or more elements or compounds which have not reacted to bond together
I need help like right now please
Answer:
The specific heat capacity of chromium is 0.449 j/g.°C thus given metal is chromium.
Explanation:
Given data:
Mass of metal = 24 g
Initial temperature = 20 °C
Final temperature = 45°C
Energy absorbed by metal = 269.4 j
Which metal is this = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 45°C - 20 °C
ΔT = 25°C
269.4 j = 24 g × c × 25°C
269.4 j = 600 g.°C× c
c = 269.4 j/600 g.°C
c =0.449 j/g.°C
The specific heat capacity of chromium is 0.449 j/g.°C thus given metal is chromium.
The energy that travels and spreads through space
Answer:
Radiant energy
Explanation:
Answer: electromagnetic waves
Explanation: energy is transmitted through space in the form of electromagnetic waves Unlike sound electromagnetic waves can travel through empty space These waves include visible light x-rays and microwaves!
Which of the following is NOT a possible clue that a chemical change has
taken place? *
A change of color
O A change of state
Production of gas
Formation of a precipitate
Answer:
ok
Explanation:
Which of the following is NOT a possible clue that a chemical change has
taken place? *
A change of color
O A change of state
Production of gas
Formation of a precipitate
