What is an estimated number?

a.

An integer

c.

An exact number

b.

An imaginary number

d.

A measured numbe

Consider the group a1 element sodium atomic number 11, the group 3a element aluminum atomic number 13, and the group 7a element chlorine atomic number 17. These elements are in period 3.

A baseball player hits a ball. Which is the best description of the energy of the ball as it flies over the pitcher's head? a. chemical b. mechanical c. kinetic d. thermal

If geologists many small earthquakes in the area near a volcano, what can they infer about the volcano? A. it's dormant B. it is about to erupt C. it is extinct D. it is a good source of geothermal energy

After decaying for 48 hours, l/16 of the original mass of a radioisotope sample remains unchanged. What is the half-life of this radioisotope?

4). How does the Stoichiometry of a reaction (balanced equation) affect reaction Rate?

What is an ion (1 mark) what is the charge on a chloride ion (1 mark) what is an ionic bond (1 mark)

Why do northern lights appear in different colors? Because charged particles of solar wind ignite different gases in Earth's atmosphere Because electrons and protons of solar wind ignite the plasma present in the corona Because electrons and protons

Which organ system consists of the following levels of organization? kidney cells - - > kidney tissues - - > kidney A. excretory B. circulatory C. respiratory D. integumentary

Identify the product of radioactive decay and classify the given nuclear reactions accordingly.

If a 860. ml of linseed oil has a mass of 680 g, what is the density of the oil