Jenica

Which experimental evidence supports Ernest Rutherford's theory that the atom is mostly empty space?

A) Positively charged particles shot into gold foil are deflected by the foil.

B) Positively charged particles shot into gold foil are attracted to the foil.

C) Most of the particles shot into gold foil pass straight through the foil.

D) Radioactive particles shot into gold foil cause the gold to become radioactive.

Which of the following parts of Dalton's atomic theory was incorrect?

A) Elements cannot turn into different elements in chemical reactions.

B) Elements can combine in different ratios in chemical reactions.

C) All matter is made of atoms that are different from one another.

D) Atoms cannot be subdivided into smaller particles.

Which of the following statements is NOT correct about atomic structure?

A) The atomic nucleus is positively charged and much larger than the individual electrons in the electron cloud that surrounds it.

B) The atomic nucleus makes up most of the mass of the atom.

C) The atomic nucleus makes up most of the volume of the atom.

D) The atomic nucleus is small, dense, and the opposite charge of the electrons.

The two atoms, 4018 'X' and 4019 'Y' :

A) are atoms of the same element

B) are isotopes of the same element

C) have the same number of neutrons in their nuclei

D) are atoms of different elements

Carbon dioxide, a compound composed of CO2 molecules, can take the form of a solid, liquid, or gas depending upon the temperature and pressure of the surroundings.

1. Which of the following statement(s) is/are TRUE? You may choose more than one

A) When carbon dioxide is a gas, CO2 molecules are packed closely together and vibrate in place

B) One difference between gaseous carbon dioxide and solid carbon dioxide is that there are less CO2 molecules per unit volume in the gaseous state than the liquid state

C) When a sample of carbon dioxide gas is moved from a small container to a larger container (assume no loss of carbon dioxide), there will be some empty or unfilled space in this new larger container

D) When a sample of carbon dioxide has changed from solid to gas to liquid in a lab (assume no loss of carbon dioxide), the volume of carbon dioxide will remain the same

E) When a sample of carbon dioxide is changed from solid to gas to liquid in a lab (assume not loss of carbon dioxide), the mass of carbon dioxide will remain the same

F) Liquid carbon dioxide will take the shape of its container

G) When comparing solid, liquid, and gaseous states of carbon dioxide, CO2 molecules are moving the fastest in the liquid state

H) A sample of solid CO2 has both a fixed shape and fixed volume

THANK YOU for any help!

Help calculating light frequency and wavelength!?

Light with a frequency of 7.3 x 1014 Hz lies in the violet region of the visible spectrum. What is the wavelength of this frequency of light in meters?

Light with a wavelength of 490 nm is emitted by copper when it is heated in a flame. What is the frequency of this light in Hz?

Please help!! Thank you!

Every 25 seconds, 2 waves pass under a sailboat at sea.

1. What is the frequency of these ocean waves?

A) 25 Hz

B) 2 m/s

C) 0.08 Hz

D) 50 Hz

2. As the wavelength increases, the frequency of a wave________________.

A) Increases

B) Decreases

C) Remains the same

3. As you move from microwaves to gamma rays, the wavelength_________________ and the frequency______________ and the energy _____________.

A) Increases, increases, increases

B) increases, increases, decreases

C) increases, decreases, decreases

D) decreases, decreases, decreases

E) decreases, increases, increases

4. As you move from microwaves to gamma rays, the frequency ______________.

A) Increases

B) Decreases

C) Stays the same

5. Which of the following wavelengths possess the least energy (and is the least dangerous to human beings)?

A) Visible Light

B) Infared

C) X-Ray

D) UV

6. Which of the following is TRUE about emission spectra

A) Electrons must absorb heat or electricity to fall to lower energy levels

B) An element that emits red light has fallen a greater energy difference than an element that produces blue light

C) Electrons give off energy in the form of light as they jump to higher energy levels

D) Each element produces a characteristic emission spectrum.

E) None of the above.

Which expression is equivalent to the expression?

-(n/m)^-8

a.(n/m)^8

b.-(m/n)^8

c.(-m/n)^-8

d.(-n/m)^8

-(n/m)^-8

a.(n/m)^8

b.-(m/n)^8

c.(-m/n)^-8

d.(-n/m)^8

x^2 - 4x - 5/ x^2 - 3x +2 divided by x^2 - 3x - 10/x^2-4

a.x-1/x+2

b. x+1/x-1

c. x-10

d. (x-5/x-2)^2

Which expression is equivalent to the expression?

[6y^2/(6y)^2]^-2

a. 1/6^6y^8

b.y^8

c.6^2y^8

d.46656y^8

The motion of an object along a horizontal path is modeled by the equation x(t) = 3 - |t - 3|, where x(t) is the position from the origin in meters and t is the time in seconds. Find the distance traveled by the object on the time interval 0 ≤ t ≤ 10.

Please help me find the answer to this!

Can someone please show me how I would find all the rational roots for this polynomial?

f(x)= 6x^4 - 4x^3 - 3x + 2

what are rational roots? I am sorry, I just don't understand this

Can someone explain to me how to do this? I don't understand,

Identify the real roots and their multiplicity for f(x) = x^7 - 5x^6 + 7x^5 - 3x^4

A) root 0, multiplicity 4; root 1, multiplicity 2 ; root 3, multiplicity 1

B) root 0, multiplicity 4 ; root 1, multiplicity 1 ; root 3, multiplicity 2

C) root 0, multiplicity 4; root -1 , multiplicity 2 ; root 3 , multiplicity 1

D) root 0, multiplicity4 ; root -1, multiplicity 1 ; root -3, multiplicity 2

this is just so confusing

thanks for any help

I don't understand Polynomials well at all and need help, could you guys show me how to do this problem? I just don't know how,

Which of the following is a root of the polynomial g(x) = 2x^3 - 19x^2 + 64x - 60

A) 4 + 2i

B) -5/2

C) 2+4i

D) 2-4i

Could you show and explain the steps please?