Calcium oxide (CaO) forms when an atom of calcium loses two electrons, giving it a +2 charge and an atom of oxygen picks up two electrons, giving it a -2 charge. What is calcium oxide?. A.) An element B.) A covalently bonded compound C.)An ionically bonded compound.

Answer:

38.8 g

Explanation:

Density is just mass divided by volume, so if you know 2 of those 3 things you can solve for the other one.

Let's write it as:  D = m/v

We know D, and we know v, so solve for m:

m = Dv

Now just plug in the the known values:

m = (0.98 g/ml)( 39.63 ml) = 38.8 g

(Notice how ml cancelled out, leaving grams, which is what we wanted for mass.)

The scientist that provided a foundation for John Dalton’s work on the atomic structure is Sir Joseph John Thompson or J.J. Thompson. It was theorized after the discovery that electrons are present in the atom. In this model, the atom is composed mainly of electrons. It was describe as plum pudding because the electrons are dispersed within the atom. 

Answer:  4) 40 ml

Solution :

According to the neutralization law,

where,

= molarity of NaOH solution = 0.30 M

= volume of NaOH solution = ?

= molarity of HCl solution = 0.80 M

= volume of HCl solution = 15 ml

Now put all the given values in the above law, we get the volume of NaOH solution.

Therefore, the volume of 0.30 M NaOH required to neutralize 15 ml of 0.80 M HCl is 40 ml.

Final answer:

The volume of 0.30 M NaOH(aq) needed to neutralize 15.0 milliliters of 0.80 M HCl(aq) is 40 milliliters.

Explanation:

The volume of 0.30 M NaOH(aq) needed to neutralize 15.0 milliliters of 0.80 M HCl(aq) can be determined using the concept of stoichiometry and the balanced equation for the reaction between NaOH and HCl. The balanced equation is:

NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

From the balanced equation, we can see that 1 mole of NaOH reacts with 1 mole of HCl. Therefore, the number of moles of HCl in 15.0 milliliters of 0.80 M HCl solution can be calculated as:

Moles of HCl = Volume (in liters) × Molarity = 0.015 liters × 0.80 moles/liter = 0.012 moles

Since 1 mole of NaOH reacts with 1 mole of HCl, we need 0.012 moles of NaOH. The volume of 0.30 M NaOH solution can be determined by rearranging the equation:

Volume (in liters) = Moles / Molarity = 0.012 moles / 0.30 moles/liter = 0.04 liters = 40 milliliters

Therefore, the volume of 0.30 M NaOH(aq) needed to completely neutralize 15.0 milliliters of 0.80 M HCl(aq) is 40 milliliters.

Learn more about Volume calculation here:

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The statement which statement best describes why the baby grasps Beth’s finger is that it is a reflex to grab is an innate behavior.

What is reflex?

In biology, a reflex, or reflex action, is an involuntary, unplanned sequence or action and nearly instantaneous response to a stimulus.

The simplest reflex is initiated by a stimulus, which activates an afferent nerve. The signal is then passed to a response neuron, which generates a response.

Reflexes are found with varying levels of complexity in organisms with a nervous system. A reflex occurs via neural pathways in the nervous system called reflex arcs. A stimulus initiates a neural signal, which is carried to a synapse. The signal is then transferred across the synapse to a motor neuron, which evokes a target response. These neural signals do not always travel to the brain,so many reflexes are an automatic response to a stimulus that does not receive or need conscious thought.

Learn more about reflex,here:

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Answer:

The baby`s reflex to grab is an innate behavior.

It`s not B because if the baby is 1 day old it`s not going to 'remember'.

It`s not C because it hasn`t really 'learned' anything.

It`s not D because babies can`t sense heat like a snake or something. -_-

Hope that helps

I also love the pfp